Question 1

An object weighing 1.840 kg has a volume of 0.0015 $$m^3. $$What is the density of the object in $$\mathrm{g/cm^3$}$$? (1 kg = 1000 g, 1 $$m^3$$ = $$10^6$$ $$cm^3)$$

Accepted Answer

$$1.2\ \mathrm{g/cm^3$}$$

Question 2

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 3

When $$49.5\ \mathrm{J} of $$heat is transferred to $$7.3\ \mathrm{g}$$ iron at $$22^\circ\mathrm{C}$$, the temperature increases to $$37^\circ\mathrm{C}. $$What is the specific heat of iron in $$\mathrm{J/g\cdot ^\circ C}$$? Use $$q = m c \Delta T.$$

Accepted Answer

$$0.45\ \mathrm{J/g\cdot ^\circ C}$$

Question 4

Which statement best reflects the results of Rutherford's gold foil experiment?

Accepted Answer

Almost all of the alpha particles passed directly through the foil.

Question 5

Which of the following statements about different elements is INCORRECT?

Accepted Answer

Sulfur is considered a metalloid.

Question 6

How many protons and electrons are present in $$\mathrm{O$$^{2-}$$}$$?

Accepted Answer

8 protons and 10 electrons

Question 7

A fictional element has two isotopes, each making up 50% of the population. Isotope 1 has a mass of 80.0 amu, Isotope 2 has a mass of 85.0 amu. Calculate the atomic mass of the fictional element.

Accepted Answer

$$82.5\ \mathrm{amu}$$

Question 8

What is the formula for an ionic compound made of aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 9

What is the name of the molecular compound $$\mathrm{SO_3$}$$?

Accepted Answer

Sulfur trioxide

Question 10

An iron chloride compound contains 55.85 grams of iron and 106.5 grams of chlorine. What is the most likely empirical formula for this compound?

Accepted Answer

$$\mathrm{$$FeCl_2$$}$$

Question 11

Which orbital-filling diagram represents the ground state of oxygen?

Accepted Answer

First image

Question 12

What is the final volume of a balloon that was initially 500.0 mL at $$25^\circ\mathrm{C}$$ and was then heated to $$50^\circ\mathrm{C}$$? (Assume pressure is constant. Use $$V_1$$/$$T_1$$ = $$V_2$$/$$T_2$$ with temperatures in Kelvin.)

Accepted Answer

542 mL

Question 13

What is the volume (in liters) of 1.00 mole of krypton gas at a pressure of 1140 mm Hg and a temperature of $$25.0^\circ\mathrm{C}$$? ($$R = 0.0821\ \mathrm{L\ atm/(mol\ K)}$$, 1 atm = 760 mm Hg)

Accepted Answer

1.37 L

Question 14

The solubility of $$\mathrm{Pb(NO_3$)_2} is 55 $$grams per 100 g $$\mathrm{H_2O} at$$ $$20^\circ\mathrm{C}. $$Which term would properly describe a solution where 44 grams of $$\mathrm{Pb(NO_3$)_2} is $$added to 100 grams of water at this temperature?

Accepted Answer

Unsaturated

Question 15

Which of the following reaction coordinate diagrams represents a chemical reaction that is exothermic?

Accepted Answer

A diagram where the products are at a lower energy than the reactants

Question 16

The equilibrium constant expression for the reaction $$\mathrm{N_2$ (g) + 3H_2 (g) \rightleftharpoons 2NH_3 (g)} is$$:

Accepted Answer

$$K_{eq} = \dfrac{[NH_3$]^2}{[N_2$][H_2$]^3}$$

Question 17

What must be TRUE for a reaction possessing a large equilibrium constant?

Accepted Answer

The forward reaction is favored.

Question 18

Which of the following will result in an increase in the amount of $$\mathrm{NH_4Cl} in $$the equilibrium $$\mathrm{NH_4Cl (s) \rightleftharpoons NH_3$ (g) + HCl (g)}$$?

Accepted Answer

Increasing the amount of $$\mathrm{NH_3$ (g)}$$

Question 19

The first experiment that converted one element to another was performed in 1919 by Ernest Rutherford. An isotope of nitrogen was bombarded with a type of particle to get an oxygen atom as shown: $$\mathrm{N + ? \rightarrow O + H}. $$Which type of particle was used to bombard the nitrogen atom?

Accepted Answer

Alpha

Guidance for Orbital-Filling Diagram Question (Ground State of Oxygen)

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