Answer
science aims to explain and understand
Explanation:
When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction
Answer:
True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.
HELP! NEED ASAP
1. A mixture of 11.23 moles of A, 26.50 moles of B, and 45.83 moles of C is placed in a one-liter container at a certain temperature. The reaction is allowed to reach equilibrium. At equilibrium, the number of moles of B is 29.445. Calculate the equilibrium.
(A)- A(g) + B(g) C(g)
(B)- SHOW ALL YOUR STEPS IN THE CALCULATIONS.
The equilibrium constant of the reaction from the calculation that has been done is 0.154
What is the equilibrium constant?The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.
We have the equation of the reaction as;
A(g) + B(g) ⇔C(g)
Thus;
Keq = 45.83/11.23 * 26.50
Keq = 0.154
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what are plasmas properties?
Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.
Explanation:(1) Plasma has a very high electrical conductivity .
(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field
(3)It is readily influenced by electric and magnetic fields .
(4)It produces it's on electromagnetic radiations.
Which best explains how photosynthesis is helpful to humans? It reduces the amount of harmful rays released by the sun. It increases the levels of carbon dioxide in the air. It provides oxygen for humans to breathe. It produces proteins, which humans can eat.
Answer:
it provides oxygen for the human to breathe
Explanation:
During photosynthesis plants absorbs carbon dioxide from the atmosphere and release oxygen into the air. Hence, it increases the level of oxygen for breath.
What is photosynthesis?Photosynthesis is a biological process by which green plants produce energy and molecular oxygen in leaf by the aid of light energy. The photoactive pigments chlorophyll in green leaves absorbs light energy sufficient for this process.
The photosynthetic reaction involves combination of carbon dioxide and water to form glucose and oxygen as written below:
\(\rm 6H_{2}O + 6CO_{2} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}\).
Therefore, photosynthesis decrease the level of carbon dioxide and increase the level of oxygen in the air . Thus, plant biomass helps us to provide oxygen to breath.
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The only type of movement particles in a solid do is
Answer
:small vibrational movements.
Explanation:
The particles of a solid are not able to move out of their positions relative to one another, but do have small vibrational movements.
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Suppose you have 100.00 mL of a solution of a dye and transfer 2.00 mL of the solution to a 100.00-ml volumetric flask. After adding water to the 100.00 mL mark, you take 5.00 mL of that solution and again dilute to 100.00 mL. If you find the dye concentration in the final diluted sample is 0.000158 M, what was the dye concen. tration in the original solution?
The initial dye solution concentration was found to be 0.158M
How do I figure out a solution's concentration?Subtract the solute's mass from the total volume of the solution. Considering m as the solute's mass and V as the total volume of the solution, write out the equation C = m/V. To determine the concentration of your solution, divide the mass and volume measurements you acquired and plug them in.
The final flask contain dye concentration = 0.000158 M = C3
The original dye solution concentration = C1
First dilution:
2 mL of dye solution transfer to second 100mL flask
C1v1 = C2v2
=> C1 x 2 = C2 x 100mL
Second dilution:
5 mL of dye solution from second to third flask (100mL)
C2v2 = C3v3
=> C2 x 5 = 0.000158 x 100
C2 => 0.00316M
C1 => 0.00316 x 100/2
=> 0.158M
Dilution factor: what is it?The stock solution is diluted by a phenomenon called the dilution factor. As indicated in the equation above, it can be expressed as the fraction of the volume of the final diluted solution (V2) to the original volume taken from the stock solution (V1).
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Have you ever heard of YUNGBLUD?
If not, look him up and tell me what you think of him.
He's bae <3<3<3
Answer:
um you can have your opinions
Explanation:
I have actually :) he is indeed bae whats your favourite song?
100 POINTS PLs HELP
How many moles of solute are present in 5.0 L of a 5.0 M potassium nitrate (KNO3) solution?
Answer:
To determine the number of moles of solute present in a solution, we can use the formula:
moles of solute = molarity x volume (in liters)
Given that the volume of the solution is 5.0 L and the molarity is 5.0 M, we can calculate the number of moles of solute as:
moles of solute = 5.0 M x 5.0 L
moles of solute = 25 mol
Therefore, there are 25 moles of potassium nitrate (KNO3) present in 5.0 L of a 5.0 M solution.
How many moles of solute are present in 5.0 L of a 5.0 M potassium nitrate (KNO3) solution?
Answer:
25 moles
Nowadays it is very important to reduce one's carbon "ootprint" (how much carbon we produce in our daly lifestyles). Mrimiting the use of fossal fuels and instead tosoring to renewable sourchis o ener
Nowadays, it is very important to reduce one's carbon "footprint" (how much carbon we produce in our daily lifestyles). By limiting the use of fossil fuels and instead turning to renewable sources of energy, we can significantly reduce our carbon emissions and mitigate the impacts of climate change.
One way to reduce our carbon footprint is by transitioning to renewable energy sources such as solar, wind, and hydropower. These sources of energy produce minimal greenhouse gas emissions compared to fossil fuels like coal, oil, and natural gas. Installing solar panels on rooftops, utilizing wind turbines, and supporting hydroelectric power can help generate clean and sustainable energy.
Another important aspect is adopting energy-efficient practices and technologies. This includes using energy-efficient appliances, LED lighting, and improving insulation in buildings to reduce energy consumption. Conserving energy in transportation by opting for public transportation, carpooling, biking, or walking can also make a significant difference.
Additionally, reducing waste and promoting recycling and composting can help minimize greenhouse gas emissions. Waste decomposition in landfills produces methane, a potent greenhouse gas. By reducing, reusing, and recycling materials, we can lower our carbon emissions and conserve resources.
Furthermore, making conscious choices in our daily lives can contribute to reducing our carbon footprint. This includes minimizing water usage, eating a plant-based diet or reducing meat consumption, and supporting sustainable and local products.
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how do we solve a WEAK/STRONG acid
Answer:
Strong acids completely dissociate into their ions in water, while weak acids only partially dissociate. There are only a few (7) strong acids, so many people choose to memorize them. All the other acids are weak.
Explanation:
Weak acids. Explaining the term "weak acid" A weak acid is one which doesn't ionise fully when it is dissolved in water. Ethanoic acid is a typical weak acid. It reacts with water to produce hydroxonium ions and ethanoate ions, but the back reaction is more successful than the forward one.
A strong acid is an acid which dissociates completely in water. That is, all the acid molecules break up into ions and solvate (attach) to water molecules. Therefore, the concentration of hydronium ions in a strong acid solution is equal to the concentration of the acid.
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If a student starts with 300. 0 mL of a gas at 17. 0 °C, what would be its volume at 35. 0°C?
The volume of the gas at 35.0°C would be approximately 324.7 mL, assuming a constant pressure of 1 atm.
To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas. The formula :
\((P_1 * V_1)\) ÷ \(T_1 = (P_2 * V_2)\) ÷ \(T_2\)
We can assume that the pressure is constant since it is not mentioned in the problem. Also, we need to convert the temperatures to Kelvin by adding 273.15 to each Celsius temperature.
Using the formula and the given values, we get:
\((P_1 * V_1)\) ÷ \(T_1 = (P_2 * V_2)\) ÷ \(T_2\)
\(V_2 = (P_1 * V_1 * T_2)\) ÷\((T_1 * P_2)\)
We can plug in the values:
\(P_1 = unknown\\V_1 = 300.0 mL \\T_1 = 17.0 + 273.15 = 290.15 K \\P_2 = unknown \\T_2 = 35.0 + 273.15 = 308.15 K\)
Now, we need to assume a pressure value. Let's assume the pressure is constant at 1 atmosphere (atm). We can now solve for \(V_2\):
\(V_2 = (P_1 * V_1 * T_2)\) ÷ \((T_1 * P_2)\)
\(V_2 = (1 atm * 300.0 mL * 308.15 K)\) ÷ \((290.15 K * 1 atm)\)
\(V_2 = 324.7 mL\)
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what will happen to the atoms or sbstance when it is condenses
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.
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Which two phase transitions can liquid undergo? (2 answers)
A. melting
B. depostion
C. vaporization
D. freezing
E. sublimation
what is the mass number notation for silicon ?
Answer: atomic number 14 and atomic mass 20.086
Explanation:
Have a graph
A student has determined that a certain bar magnet has a total of 8e23 atoms. What would the student predict for the magnetic dipole moment of the bar magnet, using the model of atoms with single unpaired electrons
The student would predict that the magnetic dipole moment of the bar magnet, using the model of atoms with single unpaired electrons, would be proportional to the number of atoms in the magnet.
In the model of atoms with single unpaired electrons, the magnetic dipole moment arises from the presence of unpaired electrons in the atomic structure. Each unpaired electron possesses a magnetic moment associated with its spin and orbital angular momentum. In a bar magnet, which is composed of many atoms, the magnetic dipole moments of individual atoms align to create an overall magnetic field.
Given that the student has determined the bar magnet to have a total of 8e23 atoms, it can be assumed that each atom has a single unpaired electron. Since the magnetic dipole moments are additive, the total magnetic dipole moment of the bar magnet would be proportional to the number of atoms.
Therefore, the student would predict that the magnetic dipole moment of the bar magnet is directly proportional to the number of atoms, which in this case is 8e23. The actual value of the magnetic dipole moment would depend on the strength of the individual atomic magnetic moments and their alignment within the magnet.
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a 2.20 sample of the of the diprotic acid h2x reacts completely with 44.2 ml of 0.450 m naoh solution. what is the molar mass of h2x?
The molar mass of h2x is 222.22 g/mol
H2X + 2NaOH → Na2X + 2H2O
Mole NaOH = concentration × volume
= 0.450 × 44.2 × \(10^{-3}\)
= 0.01989mol
Mole H2X = 0.01989 / 2 = 0.0099mol
H2X and NaOH has 1 : 2 molar ratio
Molar mass = mass / mole =2.20/0.0099 = 222.22 g/mol
A chemical compound's molar mass is calculated by dividing its mass by the number of moles measured in moles that make up the sample of that compound. In contrast to molecular properties, a substance's molar mass is a bulk property. The comp0und is present in many different forms, each with a different mass as a result of the isotopes. The mlar mass represents the average of these masses. The molar mass is most frequently calculated from the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average. The conversion betwen a substance's mass and amount can be done using the molar mass.
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Predict whether each of the following ionic compounds is soluble in water. Answer either Soluble or insoluble
LiCl
AgCl
BaCO3
K2O
Fe(NO3)3
PbS
CaCO3
K2S
Ag2O
Mg3(PO4)2
The solubility of a salt in water depends of many variables such as the elements that form the salt (it's not the same the solubility of AgCl and NaCl), the temperature or the common ion effect if the water in the problem is not pure.
Being said that, some rules were established (known as the solubility rules) to ease the identification of soluble and insoluble salts.
a.) Lithium Chloride, LiCl is soluble in water.
Silver Chloride, AgCl is insoluble in water.
Barium Carbonate, BaCO3 is insoluble in water.
Potassium, K2 is soluble in water.
Iron (III) Nitrate Fe(NO3)3 is soluble in water.
All nitrates (NO3) are soluble in water.
Alkali metals are soluble in water.
Chlorides are soluble in water with the exception of AgCl and a few others.
Therefore, the solubility depends on the type of elements where carbonates are generally insoluble in water.
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convert 5 mole(s) of Xe into molecules
Answer:
5 mol Xe × 6.02×10^23
------------ ----------------
1 1 mol Xe
3.01x10^24
I would calculate on your calculator to make sure
There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?
Answer: You would place the apple on the person's head.
Explanation:
Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that they are in the same group on the periodic table of elements. The table shows other properties that Eriq observed.
Answer:
The four elements are most likely halogens which belong to group 7A in the periodic table.
Explanation:
The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.
Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.
There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.
The elements belong to group 7A.
Answer:
Explanation:
The four elements are most likely halogens which belong to group 7A in the periodic table
The elements most likely are halogens because they usually display the same pattern of bonding as they are all diatomic molecules that need one electron to fill their outermost shell.
Another thing is that, halogens possess very strong type of ionic bonds which make them very reactive such that they react with metals to form salts. Due to this reason, they are called salt dormers.
There are other properties of these elements too such as: atomic radius, melting and boiling points, electronegativity e.t.c. They may increase or decrease down the group.
The elements belong to group 7A.
Part 1. determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. show your work.
part 2. if this sample was placed under extreme pressure, describe how the actual volume would compare to the predicted volume. explain your answer.
The molar mass of a substance can be calculated by first calculating the number of moles using ideal gas law equation:
PV = nRT
Where;
P = pressureV = volumeT = temperatureR = gas law constantn = no of moles0.98 × 1.2 = n × 0.0821 × 287
1.18 = 23.56n
n = 1.18/23.56
n = 0.05moles
mole = mass/molar mass
0.05 = 0.458/mm
molar mass = 0.458/0.05
molar mass = 9.15g/mol
Therefore, the molar mass of 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm is 9.15g/molIf this sample was placed under extreme pressure, the volume of the sample will decrease.Learn more about gas law at: https://brainly.com/question/12667831
Biochemists often study reactions in solutions containing phosphate ion, which is commonly found in cells. How many grams of solute are in 2.82 L of 0.416 M sodium hydrogen phosphate
Biochemists are a specialized group of scientists who study the molecular chemistry of living organisms, particularly in the area of biochemical reactions. The solutions containing phosphate ion, which is commonly found in cells, are often studied by biochemists.
Biochemists are a specialized group of scientists who study the molecular chemistry of living organisms, particularly in the area of biochemical reactions. The solutions containing phosphate ion, which is commonly found in cells, are often studied by biochemists. Let's calculate the number of solute grams in 2.82 L of 0.416 M sodium hydrogen phosphate.
We know that 1 mole of Na2HPO4 has a mass of 141.96 g.
Molarity (M) = moles of solute (Na2HPO4) / Liters of solution (2.82 L) 0.416 M = x / 2.82 L
x = 0.416 M × 2.82 L
x = 1.17 moles of Na2HPO4.
Now, let's calculate the mass of Na2HPO4 in 1.17 moles:
1 mole of Na2HPO4 = 141.96 g of Na2HPO4
1.17 moles of Na2HPO4 = (1.17 mol) × (141.96 g/mol) = 166.44 g of Na2HPO4
Therefore, the number of solute grams in 2.82 L of 0.416 M sodium hydrogen phosphate is 166.44 g.
Biochemists often study reactions in solutions containing phosphate ion, which is commonly found in cells. The phosphate ion plays important roles in cell signaling, energy storage, and the synthesis of DNA, RNA, and ATP. Biochemists may study how phosphate groups are transferred between molecules during metabolic reactions, or how enzymes catalyze reactions that involve phosphate-containing molecules. To study these reactions, biochemists typically work with solutions that contain phosphate ions. In this case, we were asked to calculate the mass of sodium hydrogen phosphate in a 2.82 L solution with a concentration of 0.416 M. By calculating the moles of Na2HPO4 in 2.82 L of solution, and then converting to grams, we determined that the number of solute grams in the solution is 166.44 g.
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
Entropy change is typically 160.6 J/K.
ΔH°reaction=∑ΔH°f(reactants)+∑ΔH°f(reactants)
What does a typical entropy mean?The entropy content of one mole of a pure substance at a standard condition of pressure and any desired temperature is known as the standard molar entropy in chemistry. These are frequently (but not always) used as the typical temperature and pressure.
How is the entropy of a reaction calculated?Take an energy reading at a given temperature to calculate entropy. To quantify thermal energy transmitted (q) at a particular temperature, a calorimeter is typically used. Maintain the temperature value mathematically constant by assuming only extremely slight variations in the process's conditions.
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If you are given 4.38g of a metal and this is reacted with air to produce a metal oxide weighing 5.18g. What is the Metal?
Answer:
Magnesium
Explanation:
Magnesium reacts with air (oxygen) to form metal oxide.
How many grams are in 21.7 mol of H2O?
Answer:
390.6 gram
Explanation:
Mass in gram = no of moles × molar mass
Mass in gram = 21.7×18
= 390.6 gram
Answer:
390.931576 grams
difference between the paper chromatography and chromatography
Answer:
Paper chromatography requires less preparation, whereas thin layer chromatography requires more preparation time. The stationary phase of paper chromatography is the water trapped in the cellulose filter paper. The stationary phase of the thin layer chromatography is the glass plates coated with silica gel.
Explanation:
Which is the most common category of elements on the periodic table?
A.non-metals B.metalloids C. semi-metals D.metals
Answer:
D.metals
Explanation:
The majority of elements in the periodic table are classified as metals.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Option D s correct option.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
The majority of elements in the periodic table are classified as metals. Then the number of non metals come then the metalloids. Metals are kept on the left of the periodic table.
Therefore, the correct option is option D that is metals.
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Please help quick what’s the name of the starting position of a wave in science I really need an answer fast please!
Answer:
It starts at zero, and travels to the other side. Once it reaches the other fixed point, the wave travels back to the starting poing, this is represented as the lighter line. Notice the point right in the middle at p. This point is called a node.
Explanation:
What is the number of Kelvins between the freezing point and the boiling point of water at a pressure of 760 torr
100.... The size of a unit of heat energy in the Celsius and Kelvin temperature system is the same. Thus the difference between the boiling and freezing points of water at standard pressure is 100 units on either scale.
The number of Kelvins between the freezing point and the boiling point of water at a pressure of 760 torr is 100.
What is difference between freezing point and boiling point of water ?In the Kelvin scale the water freezes at 273.15 K and boils at 373.15 K or 100° C. A single kelvin is referred to as a unit, rather than a degree and is equal to a single degree on the Celsius scale. Temperature measures with the thermometer.
The freezing point and the boiling point are the temperature where phases are change with respective the temperature. In freezing point phase change at 0° C, while in boiling point phase is change at 100° C.
Hence, the number of Kelvins between the freezing point and the boiling point of water at a pressure of 760 torr is 100.
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A balloon contains 6.5 L of helium and has a pressure of 1.5 atm. If the balloon expands to a volume of 10.0 L, what would the pressure be in the balloon?
Answer:
The pressure of the balloon is 0.98 atm
Explanation:
Using the equation P1V1 = P2V2, you can solve for the value of V2, which is 0.98 atm.
(P1V1)/P2 = V2
Plug in the numbers:
(6.5*1.5)/10.00
=0.975 atm
=.98 atm