What holds the earth in place
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How to turn any drink into a gummy
A solution of H 2 SO 4 ( aq ) with a molal concentration of 1.94 m has a density of 1.119 g / mL . What is the molar concentration of this solution?
Salt acts as an antifreeze. a. True b. False
In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})? a. The ion has a more stable electronic arrangement than the atom. b. The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom. c. The ion has two more protons than the atom. d. The ion will react more readily with free Cl₂. (E)The ion has two more planetary electrons than the atom. Can anyone explain this one?
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The answer is "the quantity of heat that is required to raise 1 g of the sample by 1°C (Kelvin) at a constant pressure"
Answer:
C
Explanation:
I just took the test twice and it wasn't D the first time
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Half life of the given radioactive substance after 1000 years is 500 years.
What is half life?
Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
For the given problem, T=1000 years and N=25% of N°
where T=time period , N=amount of quantity after decay ,N°= initial quantity.
Here,N=25% of N°
N=25/100 N°=N°/4
N°/4=N°/2
n=2
∵nt=T
So. 2t=1000
t=500 years.
Hence, the half-life of a substance is 500 years.
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25% means that 2 half-lives have already passed. So one half-life is 500 years.
B) the resulting compound cannot be dissolved in water.
C) the resulting compound forms solid crystals.
D) the resulting compound has high melting and boiling points.
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0.708M = 0.098mol/L
Rearrange to find L:
0.098mol/0.708M = .138L
For every liter there is 1000 mL:
.138L • 1000mL =138mL KOH
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Final answer:
Given 44.8 liters of H₂ gas, 22.4 liters of O₂ gas would be required for a complete reaction, producing 44.8 liters of H₂O gas. This conclusion is reached by leveraging Avogadro's law, ideal gas law, and understanding stoichiometry.
Explanation:
The question involves understanding how standard molar volumes and stoichiometry play into gas reactions. Avogadro's law states that the volume of a gas is directly proportional to the number of moles of the gas. Therefore, if you have 44.8 liters of H₂ gas, complying with Avogadro's law and the given ratios of gases as stated in the problem, you can conclude that to react completely, you would need 22.4 liters of O₂ gas, producing a total of 44.8 liters of H₂O gas as per reaction stoichiometry.
Avogadro's law is critical to understanding gas behavior and stoichiometry. Equally, understanding the concept of the ideal gas law is necessary to perform stoichiometric calculations involving gaseous substances.
Dalton's law of partial pressures also plays into calculations involving gaseous mixtures and helps to understand how different gases within a mixture interact. Overall, comprehending these concepts grants insights into gas behavior under varying temperature, pressure, and volume conditions and how gases react in chemically balanced equations.
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