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Living by Chemistry

Angelica M. Stacy

Chapter 24

Changing Conditions - all with Video Answers

Educators

Section 1

Le Chatelier’s Principle

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Problem 1

Name two things that you can do to form more starting substances in an equilibrium mixture.

Angela Williamson
Angela Williamson
Numerade Educator
01:08

Problem 2

Based on the evidence provided in this lesson, explain how you can tell if a process is exothermic as written.

Ronald Prasad
Ronald Prasad
Numerade Educator
01:38

Problem 3

If you add more ammonia, $\mathrm{NH}_{3}(a q),$ to the equilibrium mixture described by the chemical equation given below, what will happen? Explain your thinking.
$$
\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{6}^{2+}(a q) \leftrightharpoons \mathrm{Cu}^{2+}(a q)+6 \mathrm{NH}_{3}(a q)
$$

Ronald Prasad
Ronald Prasad
Numerade Educator
01:50

Problem 4

If you remove ammonia, $\mathrm{NH}_{3}(g),$ from the equilibrium mixture described by the equation here, what will happen' Explain your thinking.
$$
\mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g) \leftrightharpoons 2 \mathrm{NH}_{3}(g)
$$

Ronald Prasad
Ronald Prasad
Numerade Educator
01:54

Problem 5

If you heat the equilibrium mixture for this endothermic process, what will happen? Explain your thinking.

Ronald Prasad
Ronald Prasad
Numerade Educator
01:50

Problem 6

Suppose that you want to dissolve more copper (II) hydroxide, Cu $(\mathrm{OH})_{2}(s),$ in an aqueous solution. Would you add acid or base? Explain your thinking.
$$
\mathrm{Cu}(\mathrm{OH})_{2}(s) \leftrightharpoons \mathrm{Cu}^{2+}(a q)+2 \mathrm{OH}^{-}(a q)
$$

Ronald Prasad
Ronald Prasad
Numerade Educator
06:52

Problem 7

For each reversible process listed, describe two things you can do to change the concentration of one of the products.
a. 2 $\mathrm{NO}_{2}(g) \leftrightharpoons \mathrm{N}_{2} \mathrm{O}_{4}(g)$
b. $\operatorname{HF}(a q) \leftrightharpoons \mathrm{H}^{+}(a q)+\mathrm{F}(a q)$
c. $\mathrm{PbCl}_{2}(s) \leftrightharpoons \mathrm{Pb}^{2+}(a q)+2 \mathrm{Cl}^{-}(a q)$
$\mathrm{d} \mathrm{CaCO}_{3}(s) \leftrightharpoons \mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$

Ronald Prasad
Ronald Prasad
Numerade Educator