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

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

Question 1

Which of the following is the larger quantity: $$5.3 	imes 10^2$ mL or 6.4$$ 	imes $$10^5$$ μL?

Accepted Answer

$$6.4 	imes 10^5$ μL

Question 2

A block of solid that weighs 58.16 g is placed in a container with a 100 mL capacity. It is then filled to capacity with benzene (density $$= 0.864 g/mL) $$and measured to have a combined weight of 96.15 g. Calculate the density of the solid.

Accepted Answer

$$2.56 g/mL$$

Question 3

Different materials such as wood, vinyl, and steel were placed outdoors to determine the effect of acid rain. Their mass and appearance were recorded over time. Which statement is true?

Accepted Answer

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

Question 4

Which of the following statements use exact numbers?

Accepted Answer

(a) and (b)

Question 5

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

Accepted Answer

intensive, intensive, intensive, extensive, intensive

Question 6

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

Accepted Answer

$$V_{	ext{water}} = 232.3 mL$$; $$V_{	ext{hexane}} = 122.1 mL$$

Question 7

A sphere of persimmon wood has a diameter of $$8.32 cm $$and a mass of $$234 g. (a) $$Calculate the density of the sphere. (b) Will it float in water? (c) Will it float in petroleum ether ($$d = 0.653 g/mL$$)?

Accepted Answer

(a) The density of the sphere is $$0.776 g/mL. (b) $$The sphere will float in water. (c) The sphere will sink in petroleum ether.

Question 8

How many significant figures should be reported for the volume of the metal bar shown in the illustration?

Accepted Answer

3

Question 9

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 10

Provide the missing values for the following ions: Ga$$^{3+}$$, Ba$$^{2+}$$, F$$^-$$, Po$$^{2+}. $$Which table is correct?

Accepted Answer

Ga$$^{3+}$$: 31 electrons, 28 protons; Ba$$^{2+}$$: 56 electrons, 54 protons; F$$^-$$: 10 electrons, 9 protons; Po$$^{2+}$$: 84 electrons, 86 protons.

Question 11

Methane ($$\mathrm{CH_4$}) $$and ethylene ($$\mathrm{C_2H_2}) $$are only composed of carbon and hydrogen. How much hydrogen would react with $$1.78 g of $$carbon to produce methane and to produce ethylene? (Use the law of multiple proportions.)

Accepted Answer

for $$\mathrm{CH_4$}$$: $$0.299 g H$$; for $$\mathrm{C_2H_2}$$: $$0.149 g H$$

Question 12

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

Accepted Answer

A solid

Question 13

The natural isotopes of sulfur are listed below: $$^{32}S (94.99$$%, 31.972 amu), $$^{33}S (0.75$$%, 32.971 amu), $$^{34}S (4.25$$%, 33.968 amu), $$^{36}S (0.01$$%, 35.967 amu). Calculate the atomic weight of sulfur.

Accepted Answer

32.065 amu

Question 14

If the plum-pudding model of the atom were correct, 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 15

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 16

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

Accepted Answer

Rhodium, Silicon, Oxygen, Phosphorus

Question 17

Provide the chemical formula for each of the given binary compounds: (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 18

Write a balanced equation for the detonation of TNT ($$\mathrm{C_7H_5N_3O_6}) $$that produces $$\mathrm{N_2$}$$, $$\mathrm{H_2$}$$, $$\mathrm{CO}$$, and C.

Accepted Answer

$$2\mathrm{C_7H_5N_3O_6} \rightarrow 3\mathrm{N_2$} + 6\mathrm{H_2$} + 3\mathrm{CO} + 3\mathrm{C}$$

Question 19

Hematite ($$\mathrm{Fe_2O_3}) is a $$common iron oxide. The iron can be extracted by the following reactions: $$3\mathrm{Fe_2O_3} + \mathrm{CO} \rightarrow 2\mathrm{Fe_3O_4} + \mathrm{CO_2$}$$; $$\mathrm{Fe_3O_4} + \mathrm{CO} \rightarrow 3\mathrm{FeO} + \mathrm{CO_2$}$$; $$\mathrm{FeO} + \mathrm{CO} \rightarrow \mathrm{Fe} + \mathrm{CO_2$}. If $$the first and second reactions are carried out with an 85.6% yield and the third with a 95.6% yield, what mass of iron can be obtained from 5.00 kg of hematite?

Accepted Answer

1.52 kg Fe

Question 20

Identify the name of the hydrated ionic compound $$\mathrm{K_2CrO_4 \cdot 3H_2O}.$$

Accepted Answer

Potassium chromate trihydrate

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