Chapter 2 Homework

Question 1

Hydrocarbons contain only hydrogen and carbon. Which of the following is not a class of pure hydrocarbons?

Answer 1

Alcohols

Question 2

The iron(III) ion, Fe3+, will combine with the sulfate ion, SO42−, to form an ionic compound. What is the expected chemical formula and name for this ionic compound?

Answer 2

Fe2(SO4 )3; Ferric sulfate

Question 3

Titanium will form the cation Ti4+. What is the formula for the ionic compound titanium(IV) oxide, the white pigment in paint?

Answer 3

TiO2

Question 4

C2H2 is a chemical formula for acetylene. Which type of chemical formula is this?

Answer 4

A molecular formula

Question 5

NH4+ is an example of

Answer 5

a cation.

Question 6

When Millikan analyzed the charge of the oil drops, he found that the values were ___________ .

Answer 6

whole-number multiples of a fundamental unit of charge

Question 7

Calcium and oxygen combine in a 1:1 ratio. Which of the following pairs of elements likely combines in a 1:1 ratio?

Answer 7

strontium (Sr) and sulfur (S)

Question 8

A new element is discovered that shows no reactivity. This element probably belongs in the same group as _____.

Answer 8

neon

Question 9

Lithium combines with fluorine in a 1:1 ratio. Which of the following pairs of elements also combines in a 1:1 ratio?

Answer 9

potassium (K) and bromine (Br)

Question 10

A mass spectrometer experiment reveals peaks that correspond to masses of 23 g / mol, 37 g / mol, 38 g / mol, 52 g / mol, and 75 g / mol for a pure sample. What is the likely molecular mass of the sample?

Answer 10

75 g / mol

Question 11

How many neutrons are in the nucleus of an atom of calcium-43?

Answer 11

23

Question 12

The mass of an atom is _____ the sum of the masses of the subatomic particles of which it is composed.

Answer 12

slightly less than

Question 13

How many carbon atoms are in one molecule of methane?

Answer 13

one

Question 14

What can you tell about this molecule by looking at its structure?

Answer 14

• It will have the prefix eth- in its name.
• It is an alcohol.
• It will have the suffix -ol in its name.

Question 15

Which of the following is an alkene with 5 carbon atoms?

Answer 15

Pentene

Question 16

What is the bicarbonate ion, a component of baking soda?

Answer 16

HCO3−

Question 17

Perchloric acid is a strong acid and a strong oxidizer. What is the formula of the perchlorate anion?

Answer 17

ClO4−

Question 18

What was Thomson trying to accomplish with the electric and magnetic fields in his cathode ray tube experiments?

Answer 18

He wanted the effects of the electric and magnetic fields to cancel each other out, leaving the beam undeflected.

Question 19

Choose the correct statement to compare the diameter of the nucleus to the diameter of an atom.

Answer 19

The nucleus is about 5 orders of magnitude smaller than the atom.

Question 20

Whose experiments led to the discovery of neutrons?

Answer 20

Chadwick