Question 1

Which of Dalton's postulates is directly related to the Law of Conservation of Mass in chemical reactions?

Accepted Answer

Atoms of an element are not changed into atoms of a different element by chemical reactions; atoms are neither created nor destroyed in chemical reactions.

Question 2

A sample of copper consists of two isotopes: 69.1% $$^{63}\mathrm{Cu} ($$mass = 62.9 amu) and 30.9% $$^{65}\mathrm{Cu} ($$mass = 64.9 amu). What is the atomic weight of copper?

Accepted Answer

$$63.5\ \mathrm{amu}$$

Question 3

Which statement best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 4

What is the empirical formula for glucose, whose molecular formula is $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 5

Which of the following elements is a halogen?

Accepted Answer

Bromine ($$\mathrm{Br})$$

Question 6

A neutral atom of phosphorus ($$\mathrm{P}) $$has an atomic number of 15 and a mass number of 31. How many neutrons does it have?

Accepted Answer

16

Question 7

Which of the following is the correct chemical formula for barium hydroxide?

Accepted Answer

$$\mathrm{Ba(OH)}_2$$

Question 8

What is the charge on the ion formed when a neutral sulfur atom gains two electrons?

Accepted Answer

$$2-$$

Question 9

Which of the following is the correct name for $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 10

Which of the following is a molecular formula?

Accepted Answer

$$\mathrm{C}_2\mathrm{H}_4$$

Question 11

What is the correct formula for potassium nitrate?

Accepted Answer

$$\mathrm{KNO}_3$$

Question 12

Which of the following is the correct name for $$\mathrm{H}_2\mathrm{SO}_4$$?

Accepted Answer

Sulfuric acid

Question 13

Which of the following is a diatomic molecule that occurs naturally?

Accepted Answer

$$\mathrm{N}_2$$

Question 14

What is the chemical formula for dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

Question 15

Which of the following ions is a polyatomic anion?

Accepted Answer

Nitrate ($$\mathrm{NO}_3^-)$$

Question 16

Which element is classified as a metalloid?

Accepted Answer

Silicon ($$\mathrm{Si})$$

Question 17

A neutral atom of chlorine has 17 protons and 18 neutrons. What is its mass number?

Accepted Answer

35

Question 18

Which of the following is the correct name for $$\mathrm{Na}_2\mathrm{CO}_3$$?

Accepted Answer

Sodium carbonate

Question 19

Which of the following is the correct formula for lead(IV) oxide?

Accepted Answer

$$\mathrm{PbO}_2$$

Question 20

Which of the following statements about the periodic table is TRUE?

Accepted Answer

Elements in the same group have similar chemical properties.

Atoms, Molecules, and Ions: Foundations of General Chemistry

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