Answers
in test tube 1 iron nail gets both air and moisture which is required for rusting. ... in the test tube 3 iron nail is not rusted because of the calcium chloride which is moisture absorber. hence nail would not get moisture for the rusting.
Related Questions
The rate of reaction increases with increasing.
cati list
of the reactants, and with the addition of a
to the reaction mixture.
and
Answers
Answer: it is 800
Explanation:
Which species has 54 electrons
Answers
Answer: Neutral Xe atom
I have included an overview of the topics you MUST include in your presentation.
Topic Outlines:
Biomass (10 points)
1. What does “Biomass” mean? How is Biomass being used today as a substitute for gasoline to run cars, trucks or buses?
2. What are some different ways Biomass is being used to heat homes today?
3. Name and explain 3 advantages/disadvantages in using Biomass compared to using Fossil Fuels or other alternative energies (specifically include environmental issues that can happen).
4. Explain the energy conversions when producing energy with Biomass. (Use the words: Potential Energy and Kinetic Energy).
Geothermal (10 point)
5. Where does geothermal energy come from?
6. How can geothermal energy be used to create electricity?
7. How can geothermal energy be used directly to heat homes and factories?
8. What is a “heat pump”?
9. Name and explain 3 advantages and disadvantages in using geothermal energy compared to using fossil fuels and other alternative energies. (Specifically include environmental issues that can happen).
Hydroelectric (10 points)
10. What is a good definition of hydroelectric power?
11. How does “moving water” get turned into electrical energy? Explain each part of the dam from the moving water to production of electricity.
12. Name and explain 3 advantages/disadvantages of getting electricity from hydroelectric power and how it compares to using fossil fuels or alternative energies. (specifically include environmental issues that can happen
13. Find one example in the U.S. that uses hydroelectric power to create electricity?
Hydrogen (10 points)
14. What does using hydrogen as a fuel source mean? How is it combined to create an energy source?
15. Explain where hydrogen is found. What are sources of hydrogen found on Earth?
16. Name and explain 3 advantages/disadvantages of using hydrogen as a fuel source and how it compares to using fossil fuels and other alternative energies (specifically include environmental issues that can happen.
17. What is a fuel cell? How does it work? (include diagram)
Solar Power (10 points)
18. What is a good definition of solar energy?
19. How does a solar cell make electricity? What is it made of?
20. Name and explain 3 advantages/disadvantages about solar energy to heat or produce electricity compared to using fossil fuels or other alternatives (specifically include environmental issues that can happen.
21. Find an example of solar energy being used in the U.S.?
Wind Energy (10 points)
22. Where does wind energy come from? What is a good definition of wind energy?
23. How does wind energy get turned into electrical energy?
24. Name and explain 3 advantages/disadvantages of getting electricity from wind energy compared to using fossil fuels or other alternative energies (specifically include environmental issues that can happen.
25. Find an example in the U.S. that uses wind energy to create electricity?
Answers
Answer:
Introduction: (5 points)
Before diving into each topic, it's important to understand why alternative energies are important. Fossil fuels are limited resources that produce harmful emissions and contribute to climate change. Therefore, we must turn to alternative energies to reduce our reliance on these resources and mitigate their negative impacts on the environment. In this presentation, we will discuss five alternative energies: Biomass, Geothermal, Hydroelectric, Hydrogen, Solar Power, and Wind Energy.
Biomass: (10 points)
1.
Biomass refers to organic matter, such as wood, crops, and waste, that can be converted into energy. Biomass can be used as a substitute for gasoline to run cars, trucks or buses.
2.
Biomass can be used to heat homes through wood stoves, pellet stoves, and biomass boilers.
3.
Advantages of biomass include its renewability, availability, and its ability to reduce waste. However, it can also lead to deforestation, land-use change, and pollution.
4.
Biomass energy production involves converting potential energy (stored in biomass) into kinetic energy (in the form of steam), which is then used to generate electricity.
Geothermal:
5.
Geothermal energy comes from the heat within the Earth's crust.
6.
Geothermal energy can be used to create electricity through steam turbines.
7.
Geothermal energy can be used directly to heat homes and factories through geothermal heat pumps.
8.
A heat pump is a device that transfers heat from a colder area to a hotter area.
9.
Advantages of geothermal energy include its reliability, low emissions, and its ability to provide heating and cooling. However, it can also lead to land subsidence, water pollution, and seismic activity.
Hydroelectric:
10.
Hydroelectric power is electricity generated from the movement of water.
11.
Moving water turns a turbine, which spins a generator to produce electricity. The dam is used to regulate the flow of water and to control the amount of electricity generated.
12.
Advantages of hydroelectric power include its renewability, efficiency, and ability to provide flood control. However, it can also lead to the displacement of communities, harm aquatic life, and reduce downstream water availability.
13.
The Hoover Dam in Nevada is an example of a hydroelectric power plant.
Hydrogen:
14.
Using hydrogen as a fuel source involves combining it with oxygen to produce energy in the form of electricity and water vapor.
15.
Hydrogen is found in water, fossil fuels, and organic matter.
16.
Advantages of using hydrogen as a fuel source include its renewability, abundance, and its ability to reduce emissions. However, it can also be expensive to produce, transport, and store.
17.
A fuel cell is an electrochemical device that converts hydrogen and oxygen into electricity. It works by passing hydrogen through an anode, where it is oxidized, producing electrons and protons. The electrons flow through a circuit to produce electricity, while the protons pass through a membrane to the cathode, where they combine with oxygen to form water.
Solar Power:
18.
Solar energy is energy from the sun that can be converted into electricity.
19.
A solar cell is made of a semiconductor material, such as silicon, that absorbs photons from the sun and generates electrons. These electrons flow through a circuit to produce electricity.
20.
Advantages of solar energy include its renewability, low emissions, and its ability to reduce dependence on fossil fuels. However, it can also be expensive to install, dependent on weather conditions, and can lead to land-use change.
21.
The Topaz Solar Farm in California is an example of solar energy being used in the U.S.
Wind Energy
22.
Wind energy is a type of renewable energy that comes from the wind. Wind energy is generated by the movement of air across the earth's surface caused by differences in temperature and pressure. Wind turbines are used to convert wind energy into electrical energy.
23.
Wind energy is converted into electrical energy by wind turbines. The turbines are equipped with blades that capture the wind and spin a rotor. The rotor turns a shaft, which drives a generator that produces electricity.
24.
Advantages of wind energy include:
Wind energy is a renewable source of energy that does not emit harmful pollutants or greenhouse gases.Wind turbines can be installed on a small or large scale, making it suitable for both individual and industrial use.Wind energy can help reduce reliance on fossil fuels and contribute to a more sustainable energy mix.Disadvantages of wind energy include:
Wind turbines can be noisy and may cause visual pollution.Wind energy production is intermittent, meaning that wind turbines do not produce electricity when the wind is not blowing.Wind turbines can be dangerous to birds and bats.25.
Alta Wind Energy Center in California is an example of a wind energy project in the US. It is one of the largest wind farms in the world, with a total capacity of 1,548 MW.
Which metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)?
Answers
Mn(s) metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)
The Eo value of an electrochemical cell determines its spontaneity. Positive Eo electrochemical cells are spontaneous, and vice versa.
The relevant Eo of the half-cell in this instance are as follows for Mn(s) metal
Zn2+/Zn = -0.763v for Eo
2.37v for Eo Mg2+/Mg.
Mn2+/Mn = -1.18v for Eo.
Consequently, the equation for an Eo cell (with Zn as one of the half-cells) is: Eo Zn2+/Zn - Eo Mn2+/Mn = -0.763 - (-1.18) = 0.417v.
On the other hand, the equation for an Eo cell (with Mg as one of the half-cells) is: Eo Mg2+/Zn - Eo Mn2+/Mn = -2.37 - (-1.18) = -1.19v.
As a result, Mn(s) metal will spontaneously react with Zn2+(aq), but not with Mg2+ (aq)
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Practical work
1. What is the mass of a solution of sulfuric acid with a mass fraction of it in the solution of 96%
spent on dissolving copper scrap weighing 12.8 g, which contained 0.5 parts by mass of copper?
2. What volume of ammonia can be obtained by treating ammonium chloride weighing 12 g with a solution
sodium hydroxide, which contains 8 g of it.
3. What is the practical yield of gas, if 4 liters of it were obtained by the thermal decomposition of potassium nitrate
weighing 40.4 g?
4. What is the practical yield of the sediment, if 6.5 g of it was filtered after
addition of 15 g of barium hydroxide solution with a mass fraction of 40% to orthophosphate acid
weighing 5 g.
5. How will the rate of the reaction that takes place in the gas phase change when it decreases
temperature by 30°C, if the temperature rate coefficient for this reaction is equal to 3.
6. The reaction of the decomposition of phosphorus pentachloride proceeds according to the equation:
PCl 5 (g) ↔ PCl 3 (g) + Сl 2 (g) – 92 kJ. How to change: a) temperature; b) pressure; in)
the concentration of reactants to shift the equilibrium of the reaction towards the decomposition of PCl 5 (to the right).
Answers
Answer:
What is the mole fraction of sulfuric acid in a solution containing 98% sulfuric by mass?
What is the mole fraction of H2SO4 in a 98% aqueous H2SO4 solution?
Here given..
98 % of H2SO4 that means 98 g of H2SO4 is there in 100 g of aq. H2SO4 solution.
So.
Mass of solute = 98 g
Mass of solvent = 2 g (as water is considered as universal solvent)
Molar mass of solute = 98 g
Molar mass of solvent = 18 g
No of moles of solute = 1 mole (no of moles = given mass / molar mass)
No of moles of solvent = 2/18 = 1/9 moles
And ,
We know formula for mole fraction is..
x( of solute) = Moles of solute/(moles of solute + moles of solvent)
x (of solute) = 1/(1+(1/9)) = 0.9
x (of solvent) = 1 - 0.9 = 0.1
Explanation:
it is just number 1
A white solid can be purified from lemon juice. This solid tastes sour. When placed into water the solution conducts electricity and has a pH of 3.0. The solution turns litmus paper red. When the white powder is reacted with sodium hydroxide, a different white powder is formed which tastes salty. What kind of substance is the original white powder isolated from lemon juice?
A an acid
B a base
C a salt
D an enzyme
Answers
The kind of substance which the original white powder that is isolated from lemon juice is: A an acid.
What is pH?pH simply refers to an abbreviation for the power of hydrogen ions and it can be defined as a measure of the molar concentration of hydrogen ions in a particular chemical substance or solution.
This ultimately implies that, a pH scale can be used to measure and specify the acidity, neutrality or basicity (alkalinity) of any chemical substance or solution.
On a pH scale, a chemical substance or solution with a pH of 7 is neutral, a chemical substance or solution with a pH below 7 is acidic, and a chemical substance is basic (alkaline) when it's pH is above 7.
In this scenario, this original white powder is an acid because it has a pH of 3.0.
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explain the relationship (linear or exponential) between rate and concentration including what order the iodate ion would be in.
CONCENTRATIONS
EXP. 1: 0.020
EXP 2: 0.019
EXP 3: 0.017
EXP 4: 0.016
EXP 5: 0.014
EXP 6: 0.013
EXP 7: 0.011
EXP 8: 0.01
EXP 9: 8.6x10^-3
EXP 10: 7.1x10^-3
EXP 11: 5.7x10^-3
EXP 12: 4.3x10^-3
RATE (s^-1):
EXP 1: 0.283
EXP 2: 0.1972
EXP 3: 0.2353
EXP 4: 0.2033
EXP 5: 0.1701
EXP 6: 0.133
EXP 7: 0.10
EXP 8: 0.1234
EXP 9: 0.077
EXP 10: 0.07380
EXP 11: 0.05102
EXP 12: 0.03883
By looking at the reaction mechanism, propose a Rate Law (WITHOUT the value of K). Explain the exponents for each reactant. Also, how does the rate law proposed compared to the relationship between rate and iodate concentration observed in the Rate law question?
Discuss, with respect to collision theory, the changes in the rates result from the changing concentrations of the iodate ion. What would you predict if we repeated these reactions at higher temperatures? Explain using collision theory.
Answers
Based on the given data, the relationship between rate and concentration is exponential.
A proposed rate law for the reaction based on the given data is:
Rate = k[IO3⁻]²[H+]What is the collision theory?Collision theory suggests that the rate of a chemical reaction is proportional to the frequency and energy of collisions between the reactant molecules.
As the concentration of iodate ions decreases, the frequency of collisions between reactant molecules decreases, which leads to a decrease in the rate of the reaction.
At higher temperatures, the kinetic energy of the reactant molecules increases, which increases the frequency and energy of collisions between reactant molecules.
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Why is carbon tetravalent
Answers
If you had 6H2 molecules and 4O2 molecules, how many H2O molecules could you produce?
Answers
Answer:
6
Explanation:
As , 2H2 + O2 = 2H2O
with 6 H2, 4O2 is excess.
H2O molecules formed = 6
Which of the following corresponds to an alpha particle?
A. 1/4He
B. 3/2He
C. 2/2H
D. 4/2He
Answers
Answer:
D. 4/2 He corresponds to an alpha particle.
About how many moles of oxygen gas are in the sample?
Answers
To answer this question, we need to use the ideal gas law equation, which states that PV=nRT, where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant, and T is the temperature of the gas.
Assuming that the sample is at standard temperature and pressure (STP), which is 0 degrees Celsius and 1 atmosphere of pressure, we can use the molar volume of gas at STP, which is 22.4 liters per mole.
So, if we know the volume of the sample, we can calculate the number of moles of oxygen gas in the sample. Let's say the volume of the sample is 50 liters.
Using the formula, we can rearrange it to solve for n: n = PV/RT. Plugging in the values we have, we get:
n = (1 atm) x (50 L) / [(0.08206 L x atm/mol x K) x (273 K)]
Simplifying this, we get n = 1.83 moles of oxygen gas in the sample.
Therefore, there are about 1.83 moles of oxygen gas in the sample, assuming that it is at STP and has a volume of 50 liters.
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The number of moles in 6.0 × 10²⁴ atoms of oxygen is 5 moles (option D).
How to calculate number of moles?The number of moles in a substance can be calculated by dividing the number of atoms of the substance by Avogadro's number as follows:
no of moles = no of atoms ÷ 6.02 × 10²³
According to this question, a sample of oxygen gas is said to contain 6.0 × 10²⁴ atoms of oxygen. The number of moles in this substance can be calculated as follows:
no of moles = 6.0 × 10²⁴ atoms ÷ 6.02 × 10²³
no of moles = 1 × 10¹ = 10 moles of oxygen gas
10 ÷ 2 = 5 moles of oxygen atom
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PLEASE HELP!!!
How many calories are in 4,180 joules?
Answers
Answer:
To convert joules to calories, you can use the conversion factor:
1 calorie = 4.184 joules
To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:
4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)
Therefore, there are approximately 0.9 calories in 4,180 joules.
FUСR THE WORLD SAY AND TO 4142-414=? HELPPPPPPPPPPPPP
Answers
Answer:
UMMMMMMMMMMM
Explanation:
Answer:
3729
Explanation:
What will happen to the equilibrium system when adding HCl to aqueous solution of Na2SO4?
Answers
When HCl is added to aqueous solution of sodium sulphate aqueous solution, sulfuric acid is formed, and the solution's chemical makeup and acidity get changed.
Thus, several chemical reactions happen when HCl is introduced to a sodium sulphate aqueous solution. While sodium sulphate breaks down into 2 Na+ ions and SO4^2- ions, HCl splits into H+ and Cl- ions. When the H+ ions from HCl interact with the SO4^2- ions, sulfuric acid, a more potent acid, is created.
The solution's H+ ion concentration rises as a result of this reaction, altering the equilibrium in favor of the products. As a result, the system's equilibrium is upset, which causes sulfuric acid to form. The solution's chemical makeup and acidity ultimately alter as a result of the addition of HCl.
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Magnesium hydroxide reacts with chlorine to form magnesium chloride,
magnesium chlorate and water. How many grams of magnesium hydroxide is
needed to yield 8.00 moles of magnesium chlorate?
77.8 g Mg(OH)2
9178.1 g Mg(OH)2
2799.6 g Mg(OH)2
.823 g Mg(OH)2
How many grams of sodium sulfato pro
Answers
The grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g. None of the options provided match the calculated value of 466.64 g.
To determine the grams of magnesium hydroxide (Mg(OH)2) needed to yield 8.00 moles of magnesium chlorate (Mg(ClO3)2), we need to consider the balanced chemical equation for the reaction between magnesium hydroxide and chlorine.
The balanced equation is as follows:
2 Mg(OH)2 + 6 Cl2 → 2 Mg(ClO3)2 + 2 H2O
From the balanced equation, we can see that 2 moles of Mg(OH)2 react with 6 moles of Cl2 to produce 2 moles of Mg(ClO3)2.
Therefore, the stoichiometric ratio is 2 moles of Mg(OH)2 : 2 moles of Mg(ClO3)2.
To calculate the grams of Mg(OH)2 needed, we can use the stoichiometric ratio and the given moles of Mg(ClO3)2.
Given:
Moles of Mg(ClO3)2 = 8.00 moles
Using the stoichiometric ratio, we have:
8.00 moles Mg(ClO3)2 × (2 moles Mg(OH)2 / 2 moles Mg(ClO3)2) = 8.00 moles Mg(OH)2
To convert moles to grams, we need to multiply by the molar mass of Mg(OH)2.
The molar mass of Mg(OH)2 = (24.31 g/mol) + (2 * 16.00 g/mol) = 58.33 g/mol
Grams of Mg(OH)2 = 8.00 moles Mg(OH)2 × 58.33 g/mol = 466.64 g
Therefore, the grams of magnesium hydroxide needed to yield 8.00 moles of magnesium chlorate is approximately 466.64 g.
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Can we solve this using factor label?
Answers
\(0.0169 \ gal = 64 \ cm^{3}\)
\(1 \ gal = 3.785412 * 10^{-3} \ m^{3}\)
\(1 \ cm^{3} = 1 * 10^{-6} \ m^{3}\)
10. A tracer is a radioactive element whose pathway through which a chemical reaction can be followed. Tracers are commonly used in the medical field and in the study of plants and animals. Radioactive Iodine-131(I131) can be used to study the function of the _____ gland assisting in detecting disease.
a. Adrenal
b. Salivary
c. Pituitary
d. Thyroid
Answers
Answer is A!
Hope this helps!
VERY URGENT! IB CHEMISTRY
0.0810 g of a group 2 metal iodide, MI2, was dissolved in water and made up to a total volume of 25.00 cm3.
Excess lead(II) nitrate solution (Pb(NO3)2(aq)) was added to the MI2 solution to form a precipitate of lead(II)
iodide (PbI2). The precipitate was dried and weighed and it was found that 0.1270 g of precipitate was obtained.
a Determine the number of moles of lead iodide formed.
b Write an equation for the reaction that occurs.
c Determine the number of moles of MI2 that reacted.
d Determine the identity of the metal, M.
Answers
The number of moles of lead iodide formed is 0.000275 moles
The equation of the reaction is as follows:
MI₂ (aq) + Pb(NO₃)₂ (aq) ----> M(NO₃)₂ (aq) + PbI₂ (s)
The number of moles of MI₂ that reacted is 0.000275 moles
The group 2 metal is Calcium whose molar mass is 40.0 g
a. From the given values:
Mass of lead iodide precipitated = 0.1270 g
molar mass of lead iodide = 461 g/mol
number of moles = mass / molar mass
number of moles of lead iodide formed = 0.1270 g / 461 g /mol
number of moles of lead iodide formed = 0.000275 moles
b. The equation of the reaction shows the reactants as well as the products formed after reaction.
The general molecular equation is given as :
MI₂ (aq) + Pb(NO₃)₂ (aq) ----> M(NO₃)₂ (aq) + PbI₂ (s)
The net ionic equation is given as:
Pb²⁺ (aq) + 2 I⁻ (aq) ---> PbI₂ (s)
c. 1 mole of MI₂ reacts with 1 mole of Pb(NO₃)₂ to produce 1 mole of M(NO₃)₂ and 1 mole PbI₂
Since 0.000275 moles of PbI₂ was formed, it would require 0.000275 moles MI₂ to be formed.
Number of moles of MI₂ that reacted = 0.000275 moles
d. Mass of 0.000275 moles of MI₂ = 0.0810 g
mass of 1 mole of MI₂ = 0.0810 / 0.000275 =294.5 g
In 294.5 g of MI₂, mass composition of Iodide = 127 * 2 = 254 g
Therefore mass of the metal = mass of compound - mass of iodine in the compound
mass of metal, M = 294.5 - 254 = 40.5 g
The group 2 metal is Calcium whose molar mass is 40.0 g
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what’s is the answer?
Answers
The energy of the photon of light can be obtained as 6.27 * 10^-20 J.
What is the energy of the photon?We know that a photon has to to do with a particular unit of light. We know that light can be said to be composed of very tiny corpuscles and these corpuscles of light is what we call the photon of the light.
We can be able to us the equation that is derived by Max Plank to be able to get the value of the energy of the photon of light. Now we know that a photon of light can have an energy that is able to be obtained by;
E = hf
h = Plank's constant
f = Frequency
Then;
E = 6.6 * 10^-34 Js * 9.5 * 10^13 Hz
= 6.27 * 10^-20 J
Thus as we can see from the parameters in the question, the energy of the photon is 6.27 * 10^-20 J.
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I need another help pls
Answers
where ur question at???
You are helping a friend change the battery in his car and some of the battery
fluid spills on your arm. You quickly begin to feel your skin burning where the fluid
leaked onto you. What caused the burning and what can you do to stop the
burning sensation?
Answers
Answer: 1. Immediately flush the area with lukewarm water for 30 minutes.
2. Remove clothing and jewelry from the affected area.
3.Wait to see if symptoms appear.
How do characteristics of the planets,moons, and smaller objects in the solar system compare?
Answers
The planets, moons, and smaller objects in the solar system have several characteristics are; Size, Composition, Orbits, Atmosphere, and Evolution.
Planets are generally much larger than moons and smaller objects in the solar system. For example, the largest planet in our solar system, Jupiter, has a diameter of about 143,000 kilometers, while the Moon, Earth's natural satellite, has a diameter of about 3,474 kilometers.
Planets are typically made up of a combination of rock and/or gas, while moons and smaller objects can have a variety of compositions. Moons can be rocky, icy, or a mix of both, while smaller objects such as asteroids and comets can also have diverse compositions including rock, metal, ice, and other materials.
Planets and moons have different orbits around the Sun or their respective planets. Planets orbit the Sun in nearly elliptical paths, while moons orbit their parent planet in elliptical or nearly circular orbits.
Planets and some moons can have substantial atmospheres, while smaller objects in the solar system may have little to no atmosphere. For example, Earth has a dense atmosphere composed mainly of nitrogen, oxygen, and trace gases, while the Moon has no significant atmosphere.
Planets, moons, and smaller objects in the solar system have different origins and evolutionary histories. Planets are thought to have formed from the solar nebula, a cloud of gas and dust left over from the formation of the Sun. Moons can form throuugh various mechanisms, such as accretion, capture, or giant impacts. Smaller objects, such as asteroids and comets, are remnants from the early solar system and can provide valuable information about its history and evolution.
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Which of the following affects the potency of a drug?
The amount
Concentration
Number of exposures
Exposure method
Answers
Answer:
All of the listed factors can affect the potency of a drug.
Explanation:
All of the listed factors can affect the potency of a drug. Let's discuss each one:
The amount: The potency of a drug can be influenced by the dosage or amount administered. Generally, a higher amount of a drug can lead to a greater effect or potency. However, there may be optimal dosage ranges where the potency is maximized before plateauing or potentially causing adverse effects.
Concentration: The concentration of a drug refers to the amount of the drug present in a given volume or solution. A higher concentration of a drug can increase its potency since a greater quantity of the active substance is available to interact with the target receptors or sites.
Number of exposures: The number of times a person is exposed to a drug can also impact its potency. In some cases, repeated exposures can lead to an accumulation of the drug in the body, resulting in increased potency or stronger effects. However, this can also lead to tolerance, where the body becomes less responsive to the drug over time, requiring higher doses for the same effect.
Exposure method: The way a drug is administered or exposed to the body can affect its potency. Different routes of administration (e.g., oral, intravenous, inhalation, topical) can result in variations in the drug's absorption, distribution, and metabolism, which can influence its potency and onset of action.
It's important to note that potency is different from efficacy, which refers to the maximum therapeutic effect a drug can produce. Potency specifically relates to the amount of drug required to produce a particular effect.
When a 8.80-mg sample of a compound containing carbon is burned completely, 19.1 mg of carbon dioxide is produced. What is the mass percentage of carbon in the compound?
Answers
The mass percentage of carbon in the 8.80 mg sample of the compound is 59.2%
How do I determine the mass percentage of carbon?We'll begin by obtaining the mass of carbon in the compound. details below:
Mass of CO₂ = 19.1 mgMolar mass of CO₂ = 44 g/mol Molar of C = 12 g/mol Mass of C =?Mass of C = (12 / 44) × 19.1
Mass of C = 5.209 mg
Finally, we shall determine the mass percentage of carbon, in ompound. This is shown below:
Mass of compound = 8.80 mgMass of carbon in compound = 5.209 mgMass percentage of carbon = ?Mass percentage of carbon = (mass of carbon / mass of compound) × 100
Mass percentage of carbon = (5.209 / 8.8) × 100
Mass percentage of carbon = 59.2%
Thus, the mass percentage of carbon is 59.2%
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PLSS HELPS ME!!!!!!
Upwellings are the result of
A. the Coriolis effect.
B. gyres in the open ocean.
C. changes in the shape of coastlines.
D. wind and vertical movement of surface waters.
Answers
Answer:
it must be the answer C.
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hope it will help you
In laboratory experiment, a NOVDEC Student was
required to prepare 500 cm3 of Im Solution of
glucose (c6, H12,06) Determine the
i Molar
Mass
ii) Amount of ghicoseB. In in moles in the Solrition
[ C= 12, H = 10, 0=16]
Answers
Answer:
i. Molar mass of glucose = 180 g/mol
ii. Amount of glucose = 0.5 mole
Explanation:
The volume of the glucose solution to be prepared = 500 \(cm^3\)
Molarity of the glucose solution to be prepared = 1 M
i. Molar mass of glucose (\(C_1_2H_6O_6\)) = (6 × 12) + (12 × 1) + (6 × 16) = 180 g/mol
ii. mole = molarity x volume. Hence;
amount (in moles) of the glucose solution to be prepared
= 1 x 500/1000 = 0.5 mole
An aqueous solution of cobalt(II) fluoride, , is made by dissolving 6.04 grams of cobalt(II) fluoride in sufficient water in a 200. mL volumetric flask, and then adding enough water to fill the flask to the mark. What is the weight/volume percentage of cobalt(II) fluoride in the solution
Answers
Answer:
\(w/v\%=3.02\frac{g}{mL} \%\)
Explanation:
Hello,
In this case, we first define the formula for the calculation of weight/volume percentage considering cobalt (II) fluoride as the solute, water the solvent and the both of them as the solution:
\(w/v\%=\frac{mass_{solute}}{V_{solution}}*100\%\)
In such a way, since the mass of the solute is given as 6.04 g and the final volume of the solution 200 mL, the weight/volume percentage turns out:
\(w/v\%=\frac{6.04g}{200mL}*100\%\\\\w/v\%=3.02\frac{g}{mL} \%\)
Regards.
The value of AG at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide,
25 (s, rhombic) + 302 (g) → 2SO3 (g)
AG-370.4 kJ/mol.
+740.0
-740.8
-200,
kJ/mol.
+200.
Answers
The value of ΔG at 25 °C for the given reaction is: ΔG = -370.4 kJ/mol + 0 = -370.4 kJ/mol So, the correct answer is -370.4 kJ/mol
To determine the value of ΔG (Gibbs free energy) at 25 °C for the given reaction:
25 (s, rhombic) + 3/2 \(O_2\)(g) → \(2SO_3\)(g)
We can use the equation:
ΔG = ΔG° + RT ln(Q)
where:
ΔG is the standard Gibbs free energy change
ΔG° is the standard Gibbs free energy change under standard conditions
R is the gas constant (8.314 J/(mol·K) or 0.008314 kJ/(mol·K))
T is the temperature in Kelvin (25 °C = 298 K)
Q is the reaction quotient, which is the ratio of the concentrations of the products to the concentrations of the reactants at a given point during the reaction.
Given that ΔG° is -370.4 kJ/mol, we can plug the values into the equation:
ΔG = -370.4 kJ/mol + (0.008314 kJ/(mol·K) * 298 K) * ln(Q)
Now, we need to determine the value of Q. Since all reactants and products are in their standard states, Q = 1, as their concentrations are taken to be 1.
ΔG = -370.4 kJ/mol + (0.008314 kJ/(mol·K) * 298 K) * ln(1)
Since ln(1) = 0, the term (0.008314 kJ/(mol·K) * 298 K) * ln(1) becomes 0.
Therefore, the value of ΔG at 25 °C for the given reaction is:
ΔG = -370.4 kJ/mol + 0 = -370.4 kJ/mol
So, the correct answer is -370.4 kJ/mol.
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What is the oxidation state of P in Ca3(PO4)2?
A. -5
B. +3
C. +5
D. -3
Answers
The oxidation state of P in \(Ca_3(PO_4)_2\) is +5. In the compound \(Ca_3(PO_4)_2\), there are 3 Ca ions, each with an oxidation state of +2, and 2 \(PO_4\) ions. The correct answer is option C.
To find the oxidation state of P, we need to use the fact that the compound has a neutral overall charge and the oxidation states of all the atoms in the compound must add up to zero. Since the oxidation state of Ca is +2, the total positive charge from the Ca ions is +6. Therefore, the total negative charge from the PO4 ions must be -6. Each \(PO_4\) ion has a charge of -3, so the total charge from the two \(PO_4\) ions is -6. In \(PO_4\), the oxidation state of O is -2. Let the oxidation state of P be x. Since there is 4 O atoms per \(PO_4\) ion, the total negative charge from the O atoms is -12. Using the fact that the overall charge is zero, we can set up the following equation: 2x + (-12) = -6 Simplifying, we get 2x = +6 - (-12) = +18 Solving for x, we get x = +9/2 = +4.5. However, the oxidation state of P must be a whole number, so we round to the nearest integer and get: +5. Therefore, the oxidation state of P in \(Ca_3(PO_4)_2\) is +5 and the correct answer is option C.For more questions on the oxidation state
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Which process is constructive?
A:Water wears away rocks in a river.
B:Wind removes sand from a beach.
C:volcano forms an island in the ocean.
D:An earthquake breaks apart a cliff on a mountain.
Answers
It is the only thing that is making a new thing, and not breaking or taking apart something that is already there.