Question 1

Which law states that the mass of substances before a chemical reaction is equal to the mass of substances after the reaction?

Accepted Answer

Law of Conservation of Mass

Question 2

A sample of water is found to contain 2 grams of hydrogen and 16 grams of oxygen. According to the law of constant composition, what would be the mass of oxygen in a 4-gram sample of hydrogen from water?

Accepted Answer

$$\displaystyle 32\ \mathrm{g}$$

Question 3

Which of the following best describes the Law of Multiple Proportions?

Accepted Answer

If two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.

Question 4

Given the following data: $$1.446\ \mathrm{g} K $$reacts with $$8.178\ \mathrm{g} Cl to $$form a compound. After the reaction, $$6.867\ \mathrm{g} Cl $$remains unreacted. What is the mass of KCl formed?

Accepted Answer

$$2.757\ \mathrm{g}$$

Question 5

A red blood cell is approximately spherical with a volume of $$90 	imes 10$$^{-12}$$\ \mathrm{cm}^3. $$What is its diameter in millimeters? (Use $$V = \frac{4}{3}\pi r^3$)

Accepted Answer

$$\displaystyle 0.6\ \mathrm{mm}$$

Question 6

Which statement is NOT part of Dalton's Atomic Theory?

Accepted Answer

Atoms can be divided into protons, neutrons, and electrons.

Question 7

If $$7.5\ \mathrm{L} of $$water has a density of $$1.0\ \mathrm{g/cm}^3$$, what is its mass in kilograms?

Accepted Answer

$$\displaystyle 7.5\ \mathrm{kg}$$

Question 8

Which of the following is a correct chemical formula and what does it represent?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$; 2 hydrogen atoms and 1 oxygen atom

Question 9

A compound contains only carbon and oxygen. If $$12\ \mathrm{g} of $$carbon combines with $$16\ \mathrm{g} of $$oxygen to form one compound, and $$12\ \mathrm{g} of $$carbon combines with $$32\ \mathrm{g} of $$oxygen to form another, what is the ratio of oxygen masses that combine with a fixed mass of carbon?

Accepted Answer

$$1:2$$

Question 10

Which of the following best explains why air is essential to combustion, as discovered in early chemical experiments?

Accepted Answer

Oxygen in air reacts with substances to allow burning.

Question 11

If a sample of a compound always contains 40% carbon and 60% oxygen by mass, which law does this observation support?

Accepted Answer

Law of Constant Composition

Question 12

Which of the following is a real-world application of the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants and products in a sealed chemical reaction remains unchanged.

Question 13

A student mixes $$3.317\ \mathrm{g} of a $$substance with $$2.000\ \mathrm{g} of $$another. After the reaction, $$1.317\ \mathrm{g} of $$the first substance remains. What is the mass of the product formed?

Accepted Answer

$$4.000\ \mathrm{g}$$

Question 14

Which of the following is a correct interpretation of the Law of Definite Proportions?

Accepted Answer

All samples of a given compound have the same elemental composition by mass.

Question 15

If $$a^{b^c} = (a^b)^c$, which of the following is true for a=2$, b=3$, c=2$?

Accepted Answer

$$2^{3^2}$$ = $$(2^3)^2$

Question 16

Which of the following best describes a chemical formula?

Accepted Answer

A representation of the elements and their quantities in a compound.

Fundamental Laws and Calculations in General Chemistry

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