Q: The rate of a reaction is measured to be $$7.0 \times 10^4$\ \mathrm{M\cdot s$$^{-1}$$}$$ when $$[H_2$] = 1.1\ \mathrm{M}$$ and $$[NH_3$] = 1.9\ \mathrm{M}. $$Calculate the value of the rate constant $$k if $$the rate law is $$\text{rate} = k[H_2$][NH_3$].$$

$$3.35 \times 10^4$\ \mathrm{M$$^{-1}$$\cdot s$$^{-1}$$}$$

Question 1

A chemist determines that 0.0450 moles of mercury participated in a chemical reaction. What is the mass of mercury that participated in the reaction? (Atomic mass of Hg = 200.59 g/mol)

Accepted Answer

$$9.03\ \mathrm{g}$$

Question 2

The first five ionization energies ($$IE_1$$ through $$IE_5) of a $$Period 3 element show a large jump after the third ionization. Which element is most likely being described?

Accepted Answer

Aluminum (Al)

Question 3

A student measures 30.0 g of ethanol and consults a handbook to find its density is $$1.02\ \mathrm{g/cm^3$}. $$What volume of ethanol should the student pour out?

Accepted Answer

$$29.4\ \mathrm{cm^3$}$$

Question 4

Which of the following pairs of elements is most likely to form an ionic compound?

Accepted Answer

Potassium and Fluorine

Question 5

When adding $$7.5\ \mathrm{mL} + 5.97\ \mathrm{mL}$$, what is the correct answer with the proper number of significant digits?

Accepted Answer

$$13.5\ \mathrm{mL}$$

Question 6

In the Lewis structure of ammonia ($$NH_3$$), how many bonding pairs and lone pairs are around the nitrogen atom?

Accepted Answer

3 bonding pairs, 1 lone pair

Question 7

A neutral atom has the electron configuration $$[\mathrm{Kr}]\ 5s^2$\ 4d$$^{10}$$\ 5p^5$. How many electrons does the atom have?

Accepted Answer

53

Question 8

A cylinder contains 10.0 L of gas at 208 kPa. The piston is pushed down, compressing the gas to a final volume of 2.10 L. Calculate the final pressure, assuming temperature is constant.

Accepted Answer

$$990\ \mathrm{kPa}$$

Question 9

How many 2p electrons are present in a neutral atom of carbon?

Accepted Answer

2

Question 10

Suppose 2.5 g of Compound A and 3.0 g of Compound B are consumed in a reaction that produces only one product, Compound C. If the theoretical yield of Compound C is 4.8 g, but only 4.5 g is isolated, what is the percent yield?

Accepted Answer

$$94\%$$

Question 11

Predict the products of the following reaction and balance the equation: $$HCl + Ba(OH)_2 \rightarrow$$

Accepted Answer

$$BaCl_2 + 2H_2O$

Question 12

How many valence electrons are in the oxalate ion $$C_2O_4$$^{2-}$$?

Accepted Answer

34

Question 13

A 10.0 L tank at 14.7 $$^\circC is $$filled with 4.00 g of carbon monoxide and 17.2 g of boron trifluoride. Calculate the total pressure in the tank. ($$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$0.56\ \mathrm{atm}$$

Question 14

Liquid A is known to have a higher viscosity and higher vapor pressure than Liquid B. If equal volumes of both liquids are poured through a funnel, which will flow faster?

Accepted Answer

Liquid B

Question 15

For many purposes, ammonia ($$NH_3) $$can be treated as an ideal gas above its boiling point. If the pressure on a 320 mL sample at $$-14.0^\circC is $$doubled, what is the new temperature if the volume remains constant?

Accepted Answer

$$259^\circ\mathrm{C}$$

Question 16

A geochemist collects a 46.0 mL sample of water from a pool at $$30.0^\circC $$and isolates 1.20 g of mineral X after evaporation. What is the solubility of X in water at $$30.0^\circC$$?

Accepted Answer

$$26.1\ \mathrm{g/L}$$

Question 17

The rate of a reaction is measured to be $$7.0 	imes 10^4$\ \mathrm{M\cdot s$$^{-1}$$}$$ when $$[H_2$] = 1.1\ \mathrm{M}$$ and $$[NH_3$] = 1.9\ \mathrm{M}. $$Calculate the value of the rate constant $$k if $$the rate law is $$	ext{rate} = k[H_2$][NH_3$].$$

Accepted Answer

$$3.35 	imes 10^4$\ \mathrm{M$$^{-1}$$\cdot s$$^{-1}$$}$$

Question 18

At a certain temperature, the equilibrium constant $$K$$ for the reaction $$2\ HCl_{(g)} + Cl_2_{(g)} ightleftharpoons 2\ HCl_{(g)} is$$ $$1.3 	imes 10$$^{-9}$$. What is the equilibrium constant for the reverse reaction?

Accepted Answer

$$7.7 	imes 10^8$

Question 19

Which of the following is a physical property that can be used to distinguish between two liquids with the same density but different flow rates through a funnel?

Accepted Answer

Viscosity

GOB Chemistry Study Guide: Key Concepts, Calculations, and Applications

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