Answer:
organisms cannot stay with out getting nutrients as they will not be able to repair them selves or produce energy.
Explanation:
if the student calculates that 800000 coulombs of charge were consumed in the production of the 4 moles of hydrogen mentioned above, what is his experimental value for faraday's constant (the charge on one mole of electrons)?
2.0×10^5 C/mole is his experimental value for faraday's constant if the student calculates that 800000 coulombs of charge were consumed in the production of the 4 moles of hydrogen
Q=nC
Q=charge
n=moles
C= faraday's constant
put values in equation
C=800000/ 4
C=200000=2.0×10^5 C/mole
The amount of electric charge needed to release one gram equivalent of any ion from an electrolytic solution is measured in faraday, also known as the faraday constant, a unit of electricity used in the study of electrochemical processes. It is named for the 19th-century English physicist Michael Faraday and equals 6.022140857 ×10^23 electrons, or 9.648533289 104 coulombs. It is used in electric solutions.
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If you add chromate, an oxidizing agent, to each of the following, would a green Cr3+ solution be formed? 3-pentanol 2-methyl-2-butonal 1-propanol
If we add the chromate as an oxidizing agent, a green Cr³⁺ solution be formed :
3-pentanol convert to ketone 2-methyl-2-butonol , no reaction1-propanol to carboxylic acidThe oxidizing agent is the compound which itself rets reduce and oxidizes the other compounds. The primary alcohols get oxidized to the carboxylic acid. The secondary alcohols will convert to the ketones. The tertiary alcohols do not undergoes this reaction. The reactions are as follows :
1) CH₃ - CH₂ -CH - CH₂ CH₃ ---------> CH₃ - CH₂ - C - CH₂ - CH₃
| ||
OH O
2) 2-methyl-2-butonol -----> no reaction
3) CH₃ - CH₂ - CH₂ - OH ------>CH₃ - CH₂ - CHO ---> CH₃ - CH₂ - COOH
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John walks 10 miles a day. How many meters does he walk in 5 days?
Answer:
He will burn 50 meters in 5 days
Explanation:
multiply 10 and 5.
Answer:
80450 meters
Explanation:
To go from miles to meters multiply by 1609, so do 1609 x 10. Next, take that number times 5 because that is the number of days.
- Let me know if you need further explanation.
3. Elemental phosphorus can be reacted with elemental chlorine to form phosphorus pentachloride, used to make lithium ion batteries. The AH° = -886 kJ for this reaction. How much heat can be released in kJ if 75 grams of phosphorus are reacted with excess chlorine?
The amount of heat released in kJ when 75 grams of phosphorus react with excess chlorine is 858.848 kJ.
Heat of reactionMolar mass of P = 30.97 g/molMolar mass of PCl5 = 208.24 g/mol.Moles of P = mass of P / molar mass of P = 75 g / 30.97 g/mol = 2.42 moles
From the balanced chemical equation, 2 moles of P react with 5 moles of Cl2 to form 2 moles of PCl5.
Moles of PCl5 = (2.42 moles P / 2 moles PCl5) x (2 moles PCl5 / 5 moles Cl2) = 0.968 moles
Heat released = moles of PCl5 x AH° = 0.968 moles x (-886 kJ/mol) = 858.848 kJ
In other words, the amount of heat released in kJ when 75 grams of phosphorus react with excess chlorine is approximately 858.848 kJ.
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What element contains 15 neutrons??
Please help
Answer:
Phosphorus
Explanation:
Phosphorus is a solid, waxy material that has the symbol P on the periodic table. Its atomic number is 15 and its atomic mass is 30.973762 u .
how many protons does gold have
Answer:
gold has 79 protons
Explanation:
i looked it up lol
1. If magnesium is added to hydrochloric acid, the reaction takes 35 seconds to go to
completion. It was found to change the hydrochloric acid from 0.5 M to 0.35 M.
The rate of the reaction can be obtained as 0.004 Ms-1.
What is the rate of reaction?We know that the rate of reaction is the rate of the change of the concentration with time of the system.
The rate of a chemical reaction is the speed at which the reactants are converted into products. It is usually expressed as the change in concentration of a reactant or product per unit time.
Rate of reaction = Change in concentration/ Time
= 0.5 - 0.35/35
= 0.004 Ms-1
Thus the reaction is is calculated as 0.004 Ms-1.
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#SPJ1If magnesium is added to hydrochloric acid, the reaction takes 35 seconds to go to completion. It was found to change the hydrochloric acid from 0.5 M to 0.35 M. What is the rate of reaction?
c. Suppose that the volume of the container is now decreased to 1.75 L, with the temperature held constant. What will be the new (initial) pressure of CO2(g) in the reduced volume container, before it reaches equilibrium
The new initial pressure of CO₂ in the reduced volume container, before it reaches equilibrium, will be 1.43 times the original pressure (P).
To determine the new initial pressure of CO₂ in the reduced volume container, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when the temperature is held constant.
Given that the initial volume of the container is reduced from 2.50 L to 1.75 L, the volume is decreased by a factor of (1.75 L / 2.50 L) = 0.7.
Since volume and pressure are inversely proportional, the pressure will increase by the reciprocal of the volume change factor. Therefore, the new initial pressure of CO₂ will be (1 / 0.7) times the original pressure.
Let's assume the original pressure of CO₂ in the container was P (before it reaches equilibrium). Then, the new initial pressure of CO₂ in the reduced volume container will be:
New initial pressure = (1 / 0.7) * P = 1.43 * P
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In certain species of fish, scale color can either be blue, yellow, or blue and yellow striped. If a blue fish and a blue/yellow striped fish mate, what color scales could their offspring have?
Answer:
Blue scale or blue/yellow stripe scale
Explanation:
Let us assume that the blue color is represented by B allele while the yellow color is represented by Y allele. The two alleles are equally dominant on one another, hence, BY would represent blue and yellow stripe gene.
Blue scale - BB
Yellow scale - YY
Blue/yellow striped scale - BY
Crossing BB and BY
BB x BY
BB BY BB BY
Hence, their offspring is either BB (blue scale) or BY (blue/yellow stripe scale).
Please help on 8 thank youuuuuuuuuu
Answer:
b)5l x 10kg c)10kg + 9l (Not sure for the last 1)
9.27 mol of oxygen is equal to______molecules of oxygen
Please help I need it
5.58 × 10²⁴ molecules O₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
9.27 mol O₂ (Oxygen)
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: \(\displaystyle 9.27 \ mol \ O_2(\frac{6.022 \cdot 10^{23} \ molecules \ O_2}{1 \ mol \ O_2})\)Multiply/Divide: \(\displaystyle 5.58239 \cdot 10^{24} \ molecules \ O_2\)Step 4: Check
Follow sig fig rules. We are given 3 sig figs.
5.58239 × 10²⁴ molecules O₂ ≈ 5.58 × 10²⁴ molecules O₂
Part B Classify the following substances as diamagnetic or paramagnetic based on its magnetic properties. Drag the appropriate items to their respective bins. Hints Reset Help A substance that is weakly repelled by A substance that is attracted to an an external magnetic field external magnetic field A substance that has no net magnetic moment A substance that has only paired electrons and no unpaired electrons A substance that has unpaired electrons Diamagnetic Paramagnetic
Diamagnetic substances are weakly repelled by an external magnetic field and have no net magnetic moment. This is because all their electrons are paired and therefore there is no unpaired electron to create a magnetic field.
Examples of diamagnetic substances include copper, silver, gold, and nitrogen gas.
On the other hand, paramagnetic substances are attracted to an external magnetic field due to the presence of unpaired electrons. These unpaired electrons create a magnetic moment that aligns with the external magnetic field. Examples of paramagnetic substances include iron, nickel, cobalt, and oxygen gas.
To classify a substance as diamagnetic or paramagnetic, one needs to know the electronic configuration of the atoms or ions that make up the substance.
If the substance has only paired electrons, it is diamagnetic. If it has unpaired electrons, it is paramagnetic.
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a 15.00 ml sample of acetic acid is titrated with 34.13 ml of 0.9940 m naoh. determine the molarity of the acetic acid.
To determine the molarity of the acetic acid, we can use the equation:
M(acetic acid) x V(acetic acid) = M(NaOH) x V(NaOH)
First, we need to convert the volume of NaOH used to liters:
34.13 ml = 0.03413 L
Next, we can plug in the values we have:
M(acetic acid) x 0.01500 L = 0.9940 M x 0.03413 L
Solving for M(acetic acid), we get:
M(acetic acid) = (0.9940 M x 0.03413 L) / 0.01500 L
M(acetic acid) = 2.258 M
Therefore, the molarity of the acetic acid in the sample is 2.258 M.
To determine the molarity of the acetic acid, we can use the concept of titration and the reaction between acetic acid and NaOH.
Step 1: Write the balanced chemical equation.
CH3COOH (acetic acid) + NaOH → CH3COONa + H2O
Step 2: Calculate the moles of NaOH used.
moles of NaOH = volume (L) × molarity
moles of NaOH = 0.03413 L × 0.9940 mol/L = 0.03394 mol
Step 3: Determine the moles of acetic acid.
From the balanced equation, we see that the ratio of acetic acid to NaOH is 1:1. So, moles of acetic acid = moles of NaOH = 0.03394 mol.
Step 4: Calculate the molarity of acetic acid.
molarity = moles/volume (L)
molarity = 0.03394 mol / 0.015 L = 2.263 mol/L
The molarity of the acetic acid is 2.263 mol/L.
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how many electrons does cl want to gain? hint: how many are gained to form a stable noble gas electron configuration, ns2 np6 (octet rule)?
Chlorine (Cl) is a nonmetal, meaning it has the tendency to gain electrons to achieve the electron configuration of a noble gas. The noble gas electron configuration of the nearest noble gas, argon (Ar), is 1s2 2s2 2p6 3s2 3p6, with a total of 18 electrons.
Chlorine has 7 valence electrons, meaning it needs 1 more electron to achieve a stable noble gas electron configuration. Therefore, chlorine wants to gain 1 electron to achieve a stable noble gas configuration.
In terms of bonding, chlorine can either gain 1 electron to form an anion with a 1- charge or it can share electrons with another atom to form a covalent bond. Chlorine most commonly forms a single covalent bond with another atom, such as hydrogen, to form hydrogen chloride (HCl). In this case, both atoms share electrons to form a stable molecule.
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The electron shell model of an atom has three main components the energy shell, the subshell, and the orbital. Arrange these components from the lowest to highest maximum capacity to hold electrons. The component that can hold the greatest number of electrons should be at the top.
The selection rules of quantum mechanics allow finding the result for the order of the atomic levels are:
number higher electrons -- lower number electrons
Principal > Orbital > Magnetic
n > l > \(m_l\)
The solution of the Schrodinger equation of quantum mechanics results in the energy of the in electrons in an atom that has spherical symmetry and has three constants that are related.
The constants are called quantum numbers and are: The main, the secondary or orbital and magnetic.
The principal quantum number (n) can have values from 0 to infinity
The orbital quantum number (l) can have a value from 0 to n -1, it is customary to write this number with letters
number symbol
0 s
1 p
2 d
3 f
The magnetic quantum number (\(m_l\) ) can have values from -l to l
Apart from this number there is a fourth quantum number called spin magnetic quantum number (\(m_s\)) and it can have only two values ½ and -½,
These numbers that are allowed in quantum mechanics are called select rules. We can see that in each main number (n) there can be several orbital numbers (l) and within each orbital number there can be several magnetic numbers and within each of them there is
The order of the levels from highest to lowest number of electrons are:
Spin. Lowest
Mmagnetic
Orbital
Principal Highest
In conclusion using the selection rules of quantum mechanics we can find the result for the order of the atomic levels are:
Number higher electrons -- Lower number electrons
Principal > Orbital > Magnetic
n > l > \(m_l\)
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Briefly explain why is it important for science teachers to know how to prepare stock solution
It is important for science teachers to know how to prepare stock solutions because stock solutions are concentrated solutions that can be used to make various dilutions for experiments and scientific investigations.
1. Consistency and accuracy: Stock solutions ensure consistency and accuracy in scientific experiments. They provide a known concentration of a specific substance, allowing teachers to prepare solutions with precise and reproducible concentrations. This is crucial for obtaining reliable and consistent results.
2. Time and resource efficiency: Stock solutions save time and resources by eliminating the need to measure and prepare individual solutions for each experiment. Once a stock solution is prepared, it can be used multiple times for different experiments or dilutions. This makes the teaching process more efficient and allows for more experiments to be conducted within a limited time frame.
3. Safety: Stock solutions are often highly concentrated and may contain hazardous substances. Teachers need to know how to properly handle, store, and dilute stock solutions to ensure the safety of themselves and their students.
By understanding the proper procedures for preparing and handling stock solutions, teachers can create an optimal learning environment for their students and facilitate meaningful scientific investigations.
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Which ions produce similar colors in the flame tests?
Answer:
Two ions that produced similar colors in the flame test were Ca+2 and Sr+2. 3.
Explanation:
The colors are produced when an electron jumps to a higher level and then jump back down.
Ba2+ and Cu2+ and Sr2+ and Li+ were the pair with the similar color. Sr and Li displayed red colors, while Ba and Cu had mild greenish yellowish hues.
Why do some ions in the flame test generate colors that are similar?
The precise sizes of the potential energy jumps differ from metal to metal. As a result, the flame color of each metal will differ due to its unique spectral line pattern. The movement of the electrons in the metal ions contained in the compounds results in the hues of the flame.
The energy released by each electron when it returns to its initial condition determines the hue of the light that is produced.
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If 1.80 moles of NaCl was dissolved in enough water to make 3.60 L of solution, what is the Molarity?
Answer:
0.5M
Explanation:
The equation for molarity is:
M = \(\frac{mol}{liters}\) ; where the "M" stands for molarity, the "mol" stands for moles of solute and the "liters" means the volume in liters of solution.We are given that there are:
1.80 moles of NaCl (the moles of solute)3.60 Liters of solution (the volume in liters of solution)Now we just plug those numbers into the formula and get our answer:
M= \(\frac{1.80mol}{3.60L}\)= 0.5MAfter doing the math and dividing the moles of solute by the liters of solution, we get that the molarity of the solution is 0.5M.
Which of the following is not a reason why actual yield is less than theoretical yield?
A. presence of impure reactants
B. conservation of mass
C. competing side reactions
D. loss of product during purification
The option that isn't a reason why the actual yield is less than theoretical yield is B. conservation of mass.
It should be noted that the formula for the percent yield is given as:
= Actual yield / Theoretical Yield × 100
The actual yield is experimentally determined, and it's the quantity of a product that is gotten from a chemical reaction.The theoretical yield is the amount of product that can be obtained from a reaction when the reactants are changed to products.Actual yield can be less than theoretical yield due to the presence of impure reactants ,competing side reactions, and loss of product during purification.
In conclusion, the correct option is B.
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what compound is nadh converted to when it transfers high energy electrons to the first electron carrier
NADH (nicotinamide adenine dinucleotide hydrogen) transfers high-energy electrons to the first electron carrier in the electron transport chain, which is usually a protein complex in the inner membrane of mitochondria.
During this transfer, NADH is converted to NAD+. This reaction provides energy for the production of ATP (adenosine triphosphate) through a process known as oxidative phosphorylation. The transfer of electrons from NADH to the electron transport chain is accompanied by the movement of protons from the matrix side of the inner mitochondrial membrane to the intermembrane space, creating a proton gradient that drives the generation of ATP. The conversion of NADH to NAD+ is an essential step in cellular respiration, as it allows cells to produce ATP through the oxidation of food molecules.
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4 Al + 302 → 2Al2O3
If a chemist does the reaction and produces 3.5 moles of aluminum oxide, how many moles of O2 were used in the reaction?
According to the stoichiometry and given chemical equation ,5.25 moles of oxygen are used in the reaction to produce 3.5 moles of aluminium oxide.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation, 3 mole of oxygen produces 2 moles of aluminium oxide.
Therefore for 3.5 moles of of aluminium oxide to be produced 3.5×3/2= 5.25 moles of oxygen are used.
Thus, 5.25 moles of oxygen were used in the reaction to produce 3.5 moles of aluminium oxide.
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Metals are found on the left-hand side of the periodic table. True or False
Answer:
true pls mark brainiest
Explanation:
A reaction is occurring in a test tube. How is heat transmitted to the surroundings?
A) Molecules collide with the glass, and the glass molecules then
transmit that energy to the outside.
B) As bubbles are formed and gas escapes, the heat is carried
with the rising bubbles.
C) All of the heat escapes out of the open top of the test tube as
molecules collide with the air.
D) Heat is carried out with matter as matter is changed with the
surroundings.
Answer:
Energy Transfer 2 Quick Check
1. inside the fume hood
2. an erupting volcano
3.
many molecular collisions occurring quickly
4. Molecules collide with the glass, and the glass molecules then transmit that energy to the outside
5. Heat and matter can both transfer between the system and the surroundings.
Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different. They also have some features that are similar. What can scientists conclude from this observation?
Compared to rodents, rabbits have an extra pair of incisors and other skeletal structures that are different, scientist can conclude from this observation that they are serially homologous.
What are serially homologous?Serial homologous organs or structures are those that are structurally similar but have been modified to perform distinct functions.
As rodents and rabbits both have some similar functions and some changes in the skeletal structure, so that they both are serially homologous.
Hence scientist conclude that rodents and rabbits are serially homologous animals.
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if each of these radioactive decays occurred in a test tube, which would be the most harmful for a person sitting near the test tube?
To answer your question, it is important to note that there are three main types of radioactive decay: alpha, beta, and gamma decay.
1. Alpha decay: Alpha particles have low penetration power and can be stopped by a sheet of paper or clothing. They are less harmful if external exposure occurs.
2. Beta decay: Beta particles have higher penetration power compared to alpha particles but can be stopped by a sheet of plastic, glass, or aluminum. They are moderately harmful for external exposure.
3. Gamma decay: Gamma rays have the highest penetration power and can only be stopped by thick lead or concrete. They are the most harmful for a person sitting near the test tube due to their ability to penetrate human tissue and cause significant damage.
In conclusion, gamma decay would be the most harmful type of radioactive decay for a person sitting near a test tube containing a radioactive substance, as it has the highest penetration power and can cause significant damage to human tissue.
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2. The most common type of solution is
solution
a
O liquid-solid
O liquid-gas
A ball has a mass of 33.6 grams and a volume of 14.0 cubic centimeters (cc). What is its density?
Answer: 2400kg/m3
Explanation: p=m/3 m over 3
33.6g/14cm3
2.4g/cm3
2400kg/m3
A coffee cup calorimeter is filled with 200. 0 mL of water at 22. 1°C. A piece of metal at 48. 6°
°
C with a mass of 5. 1 g is added. The final temperature of the water in the calorimeter is 26. 8°C. The density of liquid water is 1. 00 g/mL, and its specific heat capacity is 4. 18 J/(g°C). Determine the specific heat capacity of the metal
The specific heat capacity of the metal is 35.34 J/g/°C, if the specific heat capacity of the water is 4.18 J/g/°C.
Volume of water = 200 ml
Density of water = 1 gm/ml
So the mass of the water in coffee cup, m₁ = 200×1 = 200 gm
Initial temperature of water, T₁ = 22.1°C
Specific heat capacity of water, S₁ = 4.18 J/g/°C
Mass of the metal, m₂ = 5.1 gm
Initial temperature of the metal, T₂ = 48.6°C
Final combined temperature of both, T = 26.8°C
Let the specific heat capacity of the metal = S₂
Heat gain by the water = heat loss in the metal
S₁ × m₁ × (T-T₁) = S₂ × m₂ × (T₂-T)
4.18 × 200 × (26.8-22.1) = S₂ × 5.1 × (48.6-26.8)
3929.2 = S₂ × 111.18
S₂ = 3929.2/111.18
S₂ = 35.34 J/g/°C
So, the specific heat capacity of the metal is 35.34 J/g/°C.
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Find the mass in grams of 3.012 X 10^24 ions Ca2+ ions (40.08 g/mol)
SOMEONE PLEASEEEE HELP!!!!!!!
The mass of 3.012 x 10^24 Ca2+ ions is approximately 20.03 g.
What is molar mass?
Molar mass is defined as the ratio between the mass and the amount of substance of any sample of said compound.
To find the mass of a specific number of ions, we can use the molar mass of the ions.
Given:
Ca2+ ion has a molar mass of 40.08 g/mol
Number of Ca2+ ions = 3.012 x 10^24
First, let's convert the number of ions to moles:
moles = (3.012 x 10^24 ions) / (6.022 x 10^23 ions/mol)
moles = 0.5012 mol
Next, let's multiply the number of moles by the molar mass to get the mass in grams:
mass (g) = moles * molar mass (g/mol)
mass (g) = 0.5012 * 40.08 g/mol
mass (g) = 20.03 g
Therefore,The mass of 3.012 x 10^24 Ca2+ ions is approximately 20.03 g.
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. Arrange the following in order of increasing radius:
a) Mg2+, Na+, Al3+
b) Na+, Al3+ , Mg2+
c) Mg2+ , Al3+ , Na+
d) Al3+ , Mg2+, Na+
Answer:
d
Explanation:
because nuclear charge ( no. of protons) increases