Question 1

A block of solid weighing 58.16 g is placed in a container with a 100 mL capacity. The container is filled to capacity with benzene (density $$0.864\ \mathrm{g/mL}) $$and the combined weight is $$96.15\ \mathrm{g}. $$What is the density of the solid?

Accepted Answer

$$5.87\ \mathrm{g/mL}$$

Question 2

Which of the following statements about changes observed in materials exposed to acid rain is correct?

Accepted Answer

Changes in color and texture indicate that the material underwent a chemical change.

Question 3

Identify the statements that use exact numbers.

Accepted Answer

(b) and (d)

Question 4

Determine whether the following properties are intensive or extensive: (a) refractive index, (b) malleability, (c) ductility, (d) mass, (e) melting point.

Accepted Answer

intensive, intensive, intensive, extensive, intensive

Question 5

In an experiment, you combine water ($$d = 1.00\ \mathrm{g/mL}) $$and hexane ($$d = 0.66\ \mathrm{g/mL}) in a $$beaker to make a mixture with a total volume of $$354.4\ \mathrm{mL}$$ and a total mass of $$312.9\ \mathrm{g}. $$Water and hexane do not mix. Calculate the volume of water and hexane in the mixture.

Accepted Answer

$$V_{\mathrm{water}} = 232.3\ \mathrm{mL};\ V_{\mathrm{hexane}} = 122.1\ \mathrm{mL}$$

Question 6

A sphere of persimmon wood has a diameter of $$8.32\ \mathrm{cm}$$ and a mass of $$234\ \mathrm{g}. $$Calculate its density and determine whether it will float in water ($$d = 1.00\ \mathrm{g/mL}) $$and petroleum ether ($$d = 0.653\ \mathrm{g/mL}).$$

Accepted Answer

The density of the sphere is $$1.29\ \mathrm{g/mL}. $$The sphere will sink in water. The sphere will sink in petroleum ether.

Question 7

How many significant figures should be reported for the volume of a metal bar measured as $$8.19\ \mathrm{cm} 	imes 1.50\ \mathrm{cm} 	imes 1.48\ \mathrm{cm}$$?

Accepted Answer

3

Question 8

Which statement of Dalton's atomic theory corresponds to the law of multiple proportions?

Accepted Answer

Compounds are made of 2 or more different types of atoms in fixed, simple, whole number ratios.

Question 9

Provide the missing values for the following ions:
Ga$$^{3+}$$: electrons = ?, protons = 31
Ba$$^{2+}$$: electrons = ?, protons = 56
F$$^{-}$$: electrons = ?, protons = 9
Po$$^{2+}$$: electrons = ?, protons = 84

Accepted Answer

Ga$$^{3+}$$: 28; Ba$$^{2+}$$: 54; F$$^{-}$$: 10; Po$$^{2+}$$: 82

Question 10

Methane ($$\mathrm{CH}_4) $$and ethylene ($$\mathrm{C}_2\mathrm{H}_2) $$are composed only of carbon and hydrogen. How much hydrogen would react with $$1.78\ \mathrm{g} of $$carbon to produce methane and to produce ethylene? (Use the law of multiple proportions)

Accepted Answer

for $$\mathrm{CH}_4$$: $$0.598\ \mathrm{g} H$$; for $$\mathrm{C}_2\mathrm{H}_2$$: $$0.299\ \mathrm{g} H$$

Question 11

Based on the periodic table, the element indicated in the blue square would most likely exist as:

Accepted Answer

A solid

Question 12

Given the natural isotopes of sulfur: $$^{32}\mathrm{S} (94.99$$%, 31.972 amu), $$^{33}\mathrm{S} (0.75$$%, 32.971 amu), $$^{34}\mathrm{S} (4.25$$%, 33.968 amu), $$^{36}\mathrm{S} (0.01$$%, 35.967 amu), calculate the atomic weight of sulfur.

Accepted Answer

32.065 amu

Question 13

If the plum-pudding model of the atom were accurate, what would be the outcome of Rutherford's gold foil experiment?

Accepted Answer

The alpha particles will travel straight through the gold foil with little to no deflection.

Question 14

If the reaction of A and B resulted in A$$^{2+}$$ and B$$^{-}$$ ions, A and B come from what groups of the periodic table?

Accepted Answer

A: Group 2A; B: Group 7A

Question 15

Name the following elements with the symbols: Rh, Si, O, P.

Accepted Answer

Rhodium, Silicon, Oxygen, Phosphorus

Question 16

Provide the chemical formula for each of the given binary compounds below:
(a) palladium(IV) sulfide
(b) rubidium selenide
(c) molybdenum(VI) iodide
(d) niobium(V) sulfide

Accepted Answer

(a) PdS$$_2$$; (b) Rb$$_2Se$$; (c) MoI$$_6$$; (d) Nb$$_2S$_5$$

Question 17

Write a balanced equation for the detonation of TNT ($$\mathrm{C}_7\mathrm{H}_5\mathrm{N}_3\mathrm{O}_6) to $$produce $$\mathrm{N}_2$$, $$\mathrm{H}_2$$, $$\mathrm{CO}$$, and $$\mathrm{C}.$$

Accepted Answer

$$3\ \mathrm{C}_7\mathrm{H}_5\mathrm{N}_3\mathrm{O}_6 \rightarrow 4\ \mathrm{N}_2 + 4\ \mathrm{H}_2 + 10\ \mathrm{CO} + \mathrm{C}$$

Question 18

Hematite ($$\mathrm{Fe}_2\mathrm{O}_3) is a $$common iron oxide. Iron can be extracted from hematite by the following reactions:
$$3\ \mathrm{Fe}_2\mathrm{O}_3 + \mathrm{CO} \rightarrow 2\ \mathrm{Fe}_3\mathrm{O}_4 + \mathrm{CO}_2$$
$$\mathrm{Fe}_3\mathrm{O}_4 + \mathrm{CO} \rightarrow 3\ \mathrm{FeO} + \mathrm{CO}_2$$
$$\mathrm{FeO} + \mathrm{CO} \rightarrow \mathrm{Fe} + \mathrm{CO}_2
If $$the first and second reactions are carried out with $$85.6\%$$ yield and the third with $$95.5\%$$ yield, what mass of iron can be obtained from $$5.00\ \mathrm{kg} of $$hematite?

Accepted Answer

$$3.96\ \mathrm{kg} Fe$$

Question 19

Identify the name of the hydrated ionic compound $$\mathrm{K}_2\mathrm{CrO}_4\cdot 3\mathrm{H}_2\mathrm{O}.$$

Accepted Answer

Potassium chromate trihydrate

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