CHEMISTRY HIGH SCHOOL

HELP!!!! The freezing of methane is an exothermic change. What best describes the temperature conditions that are likely to make this a spontaneous change? Any temperature, because entropy increases during freezing. Any temperature, because entropy decreases during freezing. Low temperature only, because entropy decreases during freezing. High temperature only, because entropy increases during freezing.

Answers

Answer 1

Answer:

Answer: The correct statement is low temperature only, because entropy decreases during freezing.

Explanation:

The relationship between Gibb's free energy, enthalpy, entropy and temperature is given by the equation:

$\Delta G=\Delta H-T\Delta S$

Where,

$\Delta G$ = change in Gibb's free energy

$\Delta H$ = change in enthalpy

T = temperature

$\Delta S$ = change in entropy

It is given that freezing of methane is taking place, which means that entropy is decreasing and $Delta S$ is becoming negative. It is also given that the reaction is an exothermic reaction, this means that the $\Delta H$ is also negative.

For a reaction to be spontaneous, $\Delta G$ must be negative.

$-ve=-ve-[T(-ve)]\n\n-ve=-ve+T$

From above equations, it is visible that $\Delta G$ will be negative only when the temperature will be low.

Hence, the correct statement is low temperature only, because entropy decreases during freezing.

Answer 2

Answer:

Answer:

Low temperature only, because entropy decreases during freezing.

Explanation:

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The unstable arrangement of atoms that forms momentarily at the peak of the activation-energy barrier is known as the what?

What particles in an atom are involved in chemical reactions

Answers

Answer: Electrons

Explanation: In chemical reactions, elements and compounds change in order to form different substances. This changes can be:

1. oxidation state: which is define as the charge of the atom

2. bonding: atoms in a compound are bonded, this bonds can break so atoms rearrange to form different substances

In this changes electrons are involve. The charge depends on the amount of negative charge of electron respect to positive charge of proton in nucleus which remain the same, otherwise we would be talking about nuclear reactions.

Also, bonding depends on the electrons that atoms can give, receive or share to form ionic or covalent bonds.

A mixture of uneven distribution and easy separation is called_____. homogeneous heterogeneous a solution a pure substance

Answers

the correct answer is heterogeneous.

Answer:

heterogeneous

Explanation:

What is produced as a lead-acid battery is discharged?a. Acid
c. Electrolytes
b. Lead sulfate
d. Zinc oxide

Answers

Lead sulfate is produced as a lead acid battery is discharged. Hope this helped!

Answer:

Explanation:

Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of the sample remains the same?

Answers

Following the ideal gas law PV = nRT, and changing it in terms of temperature, we get T = PV/nR. When volume of a sample of an ideal gas to double when the pressure of the sample remains the same, the temperature doubles because temperature is directly proportional with pressure and volume.

If you have 3 moles of FeCl3, how many moles of MgCl2 can be produced? FeCl3 + Mg --> MgCl2 + Fe PLEASE ANSWER

Answers

Answer: 154.09 g

Explanation:

3 Mg + 2 FeCl3 = 3 MgCl2 + 2 Fe

The mass of MgCl2 produced is calculated:

m MgCl2 = 175 g FeCl3 * (1 mol FeCl3 / 162.2 g) * (3 mol MgCl2 / 2 mol FeCl3) * (95.21 g MgCl2 / 1 mol) = 154.09 g

In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:N2(g) + 3H2(g) 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
How many grams of Ny must react to form 1.7 grams of ammonia, NH3?
0.052 g
1.49
0.00589
2.8 g

Answers

Answer:

Explanation:

Here we have to use stoichiometry.

First of all, we have to calculate the mass of 100% of yield:

1.7 g ------- 98%

X -------- 100%

X = 1.73 g (approximately)

Second, we have to calculate the mass of N2 that is necessary to react to produce the mass of 1.73g of NH3. To do that, we have to use the Molar mass of N2 and NH3 and don't forget the stoichiometric relationship between them.

Molar Mass N2 : 14x2 = 28 g/mol

Molar Mass NH3: 14 + 3 = 17 g/mol

28g (N2) ------- 17x2 (NH3)

X ------------ 1.73 g

X = 1.42 g (approximately)

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