Q: Given the reaction $$2\ N_2O(g) \rightarrow 2\ N_2$(g) + O_2$(g)$$, express the rate in terms of the disappearance of $$N_2O$$ and the appearance of $$O_2.$$

$$\text{rate} = -\frac{1}{2} \frac{d[N_2O]}{dt} = \frac{d[O_2$]}{dt}$$

Question 1

Refer to the phase diagram of water. What phase change occurs when moving from point A to point B?

Accepted Answer

Sublimation

Question 2

Which region of the water phase diagram represents the conditions under which water exists as a liquid?

Accepted Answer

Between the triple point and the critical point, above 0.6 kPa and below 22,089 kPa

Question 3

In the decomposition reaction $$2\ N_2O(g) \rightarrow 2\ N_2$(g) + O_2$(g)$$, if the initial rate of disappearance of $$N_2O is$$ $$-0.900\ M/s$$, what is the rate of appearance of $$O_2$$?

Accepted Answer

$$+0.450\ M/s$$

Question 4

Given the reaction $$2\ N_2O(g) \rightarrow 2\ N_2$(g) + O_2$(g)$$, express the rate in terms of the disappearance of $$N_2O$$ and the appearance of $$O_2.$$

Accepted Answer

$$	ext{rate} = -\frac{1}{2} \frac{d[N_2O]}{dt} = \frac{d[O_2$]}{dt}$$

Question 5

The titration curve shown has an equivalence point at pH \u003e 7. Which type of titration does this represent?

Accepted Answer

A weak acid titrated with a strong base

Question 6

If the equivalence point in a titration curve is at pH 7, what does this indicate about the acid and base involved?

Accepted Answer

Both the acid and base are strong

Question 7

Using the standard reduction potential table, which metal will NOT dissolve in HBr?

Accepted Answer

Copper

Question 8

Refer to the standard reduction potential table. Which metal is the strongest reducing agent?

Accepted Answer

Lithium

Question 9

Which process results in an increase in entropy of the universe?

Accepted Answer

All of the above

Question 10

Balance the following redox reaction in acidic solution: $$Br_2(l$$) \rightarrow $$BrO_3^-(aq) + Br^-(aq$$)$$. What is the correct balanced equation?

Accepted Answer

$$3Br_2(l) + 3H_2O(l) \rightarrow $$BrO_3$$^-(aq) + 6H^+(aq) + 5Br^-(aq)$$

Question 11

For the reaction $$A + 3B \rightarrow 2C$$, how does the rate of disappearance of B compare to the rate of appearance of C?

Accepted Answer

The rate of disappearance of B is $$\frac{3}{2}$$ times the rate of appearance of C

Question 12

A reaction has a half-life ($$t_{1/2}) of$$ $$0.950\ s$$ and is first order. What is the rate constant $$k$$?

Accepted Answer

$$0.729\ s$$^{-1}$$

Question 13

What percentage of a material will persist after 80 minutes if its half-life is 20 minutes?

Accepted Answer

6.25%

Question 14

Which of the following is NOT a colligative property?

Accepted Answer

Density

Question 15

Which of the following molecules experiences the strongest intermolecular force?

Accepted Answer

NaCl (aq)

Question 16

Which of the following factors affect viscosity?

Accepted Answer

All of the above (intermolecular force, temperature, pressure)

Question 17

Which of the following is TRUE regarding intermolecular forces?

Accepted Answer

All molecules have London dispersion forces

Question 18

Which pair is a Bronsted-Lowry conjugate pair?

Accepted Answer

$$HNO_2$$ and $$NO_2$$^-$$

Question 19

Which acid would you choose to combine with its sodium salt to make a solution buffered at pH 4.25?

Accepted Answer

Formic acid (pKa = 3.74)

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