Q: Which of the following is the correct balanced equation for the combustion of methane?

$$\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$$

Question 1

Which statement best describes the Law of Conservation of Matter as demonstrated in chemical reactions?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 2

Dalton’s Atomic Theory states that:

Accepted Answer

Atoms of a given element are identical in mass and properties.

Question 3

Which experiment led to the discovery of the electron?

Accepted Answer

Thomson’s cathode ray tube experiment

Question 4

Given the following data for boron isotopes, calculate the average atomic mass:

Isotope 10: $$10.013\ 	ext{amu}$$, abundance $$0.1978$$
Isotope 11: $$11.009\ 	ext{amu}$$, abundance $$0.8022$$

Accepted Answer

$$10.81\ 	ext{amu}$$

Question 5

Which of the following is the correct nuclide symbol for an atom with 19 protons and 20 neutrons?

Accepted Answer

$$^{39}_{19}	ext{K}$$

Question 6

Which statement about isotopes is correct?

Accepted Answer

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

Question 7

A compound contains 75.78% of isotope X with mass $$34.97\ 	ext{amu}$$ and 24.22% of isotope Y with mass $$36.97\ 	ext{amu}. $$What is the average atomic mass?

Accepted Answer

$$36.17\ 	ext{amu}$$

Question 8

Which of the following best describes a cation?

Accepted Answer

An atom that has lost electrons and is positively charged.

Question 9

What is the correct formula for aluminum oxide?

Accepted Answer

$$	ext{Al}_2	ext{O}_3$$

Question 10

Which of the following is a binary molecular compound?

Accepted Answer

$$	ext{CO}_2$$

Question 11

What is the correct name for $$	ext{SF}_6$$?

Accepted Answer

Sulfur hexafluoride

Question 12

Which of the following is the correct balanced equation for the combustion of methane?

Accepted Answer

$$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$

Question 13

Which of the following ions is a polyatomic ion?

Accepted Answer

$$	ext{SO}_4$$^{2-}$$

Question 14

What is the charge on a monatomic ion of a Group 17 (VIIA) element?

Accepted Answer

$$-1$$

Question 15

Which of the following is the correct name for $$	ext{CuSO}_4 \cdot 5	ext{H}_2	ext{O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 16

Which statement about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 17

What is the correct formula for magnesium oxide?

Accepted Answer

$$	ext{MgO}$$

Question 18

Which of the following is the correct name for $$	ext{HNO}_3$$?

Accepted Answer

Nitric acid

Question 19

Which of the following best describes a chemical formula?

Accepted Answer

A notation using atomic symbols and subscripts to convey the relative proportions of atoms in a substance.

Question 20

Which of the following is a correct statement about the structure of the atom according to the nuclear model?

Accepted Answer

Most of the atom's mass is concentrated in the nucleus.

Ch 2 Atoms, Molecules, and Ions: Foundations of Atomic Theory and Structure

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