Question 1

Which statement best describes the law of conservation of mass as demonstrated in the reaction: $$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$, where 16.0 g of methane reacts with 64.0 g of oxygen to produce 36.0 g of water?

Accepted Answer

The total mass of reactants equals the total mass of products.

Question 2

Given the reaction $$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$, if 16.0 g of methane and 64.0 g of oxygen react to produce 36.0 g of water, how many grams of carbon dioxide are produced?

Accepted Answer

$$44.0\ 	ext{g}$$

Question 3

Which of the following best describes the location of metals on the periodic table?

Accepted Answer

Metals are located on the left side and in the center (transition metals) of the periodic table.

Question 4

Which of the following statements about nonmetals is correct?

Accepted Answer

Nonmetals are located in the upper-right side of the periodic table.

Question 5

Which of the following is true about isotopes of an element?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 6

What is the atomic number and mass number for $$^{35}_{17}	ext{Cl}$$?

Accepted Answer

Atomic number: 17, Mass number: 35

Question 7

How is the average atomic mass of an element calculated from its isotopes?

Accepted Answer

By multiplying the mass of each isotope by its relative abundance and summing the results.

Question 8

A sulfur atom has 16 protons and 16 electrons. How many electrons does a sulfide ion ($$	ext{S}^{2-}) $$have?

Accepted Answer

18

Question 9

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 10

Which experiment led to the discovery that atoms have a small, dense, positively charged nucleus?

Accepted Answer

Rutherford’s gold foil experiment

Question 11

Which of the following best describes the difference between mass number and average atomic mass?

Accepted Answer

Mass number is the sum of protons and neutrons in one atom; average atomic mass is the weighted average of all isotopes.

Question 12

If an atom has 12 protons, 12 neutrons, and 10 electrons, what is its overall charge?

Accepted Answer

$$+2$$

Question 13

Which of the following is a correct statement about the arrangement of subatomic particles in an atom?

Accepted Answer

Protons and neutrons are in the nucleus; electrons are outside the nucleus.

Question 14

Which of the following best explains why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have similar arrangements of electrons in their outer shells.

Question 15

A sample contains 98.93% $$^{12}	ext{C} ($$mass = 12.0000 u) and 1.07% $$^{13}	ext{C} ($$mass = 13.0034 u). What is the average atomic mass of carbon?

Accepted Answer

$$12.01\ 	ext{u}$$

Question 16

Which of the following is NOT a property of metals?

Accepted Answer

They are located on the right side of the periodic table.

Question 17

Which of the following best describes the Bohr model of the atom?

Accepted Answer

Electrons move in fixed orbits around the nucleus.

Question 18

Which of the following is a correct application of the law of conservation of mass in a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products.

Atoms, Elements, and Atomic Structure: Foundations of Chemistry

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