Question 1

A company refines nickel by decomposing nickel carbonyl gas: $$\mathrm{Ni(CO)_4(g) \rightarrow Ni(s) + 4CO(g)}. $$According to Le Chatelier's Principle, what will happen to the rate of nickel production if the pressure is increased at constant temperature?

Accepted Answer

Nickel will be produced at a lower rate.

Question 2

Which of the following best explains why the BrCl molecule is polar?

Accepted Answer

The shared electrons are closer to Cl due to the greater electronegativity of chlorine.

Question 3

A scientist has 2.70 g of aluminum and wants to react it completely with sulfur to form aluminum sulfide ($$\mathrm{Al_2S_3}). $$How many grams of sulfur are required? (Al: 27.0 g/mol, S: 32.1 g/mol)

Accepted Answer

1.51 g

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes are atoms of the same element with different numbers of neutrons.

Question 5

Which of the following is NOT a physical property of elements?

Accepted Answer

Combustibility

Question 6

A solution contains 180 g of glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass = 180 g/mol) and 162 g of water (molar mass = 18 g/mol). What is the mole fraction of glucose?

Accepted Answer

$$0.10$$

Question 7

Which of the following changes would decrease the rate of a chemical reaction?

Accepted Answer

Adding heat to an exothermic reaction

Question 8

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

The mass of the products must be equal to the mass of the reactants in any chemical reaction.

Question 9

Which of the following is the correct mass action expression for the equilibrium $$2\mathrm{H_2$}(g) + \mathrm{S_2$}(g) \rightleftharpoons 2\mathrm{H_2S}(g)$$?

Accepted Answer

$$K = \dfrac{[\mathrm{H_2S}]^2}{[\mathrm{H_2$}]^2[\mathrm{S_2$}]}$$

Question 10

Which of the following best describes the process of nuclear fission?

Accepted Answer

The splitting apart of atomic nuclei

Question 11

Which of the following is NOT a correct temperature conversion?

Accepted Answer

$$^\circ\mathrm{C} = K + 273$$

Question 12

Which of the following is the correct formula for beryllium chloride?

Accepted Answer

$$\mathrm{$$BeCl_2$$}$$

Question 13

Which of the following is NOT a characteristic property of a true solution?

Accepted Answer

The particles are larger than $$10^{-8} cm.$$

Question 14

Which of the following best describes the relationship between ionization energy and electronegativity on the periodic table?

Accepted Answer

Both increase going across a row and up a column.

Question 15

Which of the following is NOT a correct statement about reversible reactions?

Accepted Answer

At equilibrium, the forward and reverse reactions stop at the appropriate concentrations.

Question 16

Which of the following is the correct definition of molarity?

Accepted Answer

Number of moles per liter of solution

Question 17

Which of the following is NOT a correct measure of density?

Accepted Answer

mass $$	imes$$ volume

Question 18

Which of the following is NOT a correct statement about the elements of a period in the periodic table?

Accepted Answer

They have similar chemical characteristics.

Question 19

Which of the following is NOT a correct statement about acids and bases?

Accepted Answer

All acidic solutions contain some $$\mathrm{OH^-}$$ ions.

Question 20

Which of the following is NOT a correct statement about the effect of temperature on the boiling point of a liquid at high altitude?

Accepted Answer

The reduced vapor pressure at high altitudes causes a liquid to boil at a higher temperature.

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