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kvv77 [185]
3 years ago
12

Which of the following is true?

Chemistry
1 answer:
Tomtit [17]3 years ago
3 0

Answer:

a. A reaction in which the entropy of the system increases can be spontaneous only if it is endothermic.

Explanation:

The change in free energy (ΔG) that is, the <u>energy available to do work</u>, of a system for a constant-temperature process is:

ΔG = ΔH - TΔS

  • When ΔG < 0 the reaction is spontaneous in the forward direction.
  • When ΔG > 0 the reaction is nonspontaneous. The reaction is

spontaneous in the opposite direction.

  • When ΔG = 0 the system is at equilibrium.

If <u>both ΔH and ΔS are positive</u>, then ΔG will be negative only when the TΔS  term is greater in magnitude than ΔH. This condition is met when T is large.

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Investigations were carried out in a science lab to explore the topic of chemical and physical changes.
Rudiy27

Investigation B, Step 2 only is the one in which a chemical change will most likely occur and is denoted as option D.

<h3>What is Chemical change?</h3>

This is referred to as a type of reaction which is characterized by the formation of a new substance as a result of the synthesis or decomposition of a substance which is referred to as the reactant through various methods and techniques.

In the Investigation B, Step 2, the sugar solution is heated on a burner until the solution thickens and turns brown thereby forming caramel. The chemical change in this scenario is depicted as the caramel which is produced in the process known as caramelisation.

There is a new substance formed which is therefore the reason why option D was chosen as the most appropriate choice.

Read more about Chemical change here brainly.com/question/11231920

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7 0
1 year ago
If you were asked to convert 1.3 mol Al to atoms, which of the following should you use for the conversion?
Irina18 [472]
"<span>6.022 * 10^23 atoms Al/1 mol Al" is the one that should be used for the conversion. Multiplying the number of moles by Avogadro's number would yield the correct result. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer helps you.</span>
5 0
3 years ago
What is the number of copper atom in one naira coin which weight is 7.3g a sum of the material is 86%
Step2247 [10]

Answer:

5.9x10²² atoms of Cu are in one naira coin

Explanation:

To solve this question we need to find the mass of Copper. Then, using its molar mass (Cu = 63.546g/mol) we must find the moles of Cu and its atoms using Avogadro's number:

<em>Mass Cu:</em>

7.3g * 86% = 6.278g is the mass of Cu.

<em>Moles Cu:</em>

6.278g * (1mol / 63.546g) = 0.099moles Cu

<em>Atoms Cu:</em>

0.099moles Cu * (6.022x10²³atoms / 1mol) =

<h3>5.9x10²² atoms of Cu are in one naira coin</h3>
4 0
2 years ago
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Leya [2.2K]

Answer: 272.5915639999...

Explanation:

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3 years ago
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Rubidium Chromate is the compound
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