# Basics of Chemistry (G.O.B.) Homework Pack

Lead Author(s): Norbert Pienta

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Homework and Practice Questions from Basics of Chemistry: General, Organic and Biological text.

# Chapter 1: Homework Questions

Homework Question 1.01

True or False: An element is defined by its number of electrons or number of protons.

A

True

B

False

Homework Question 1.02

How many electrons and protons are in these elements? Match the correct answer.

Premise
Response
1

Potassium

A

23

2

Magnesium

B

33

3

Vanadium

C

20

4

Nickel

D

79

5

Gold

E

19

6

Arsenic

F

13

7

Selenium

G

34

8

Bromine

H

12

I

28

J

35

Homework Question 1.03

How many electrons, protons and neutrons are in these elements? Match the correct response.

Premise
Response
1

Sodium

A

27; 27; 32

2

Barium

B

56; 56; 81

3

Cobalt

C

14; 14; 14

4

Tin

D

9; 9; 10

5

Boron

E

56; 56; 57

6

Silicon

F

7; 7; 7

7

Nitrogen

G

50; 50; 69

8

Fluorine

H

11; 11; 12

I

5; 5; 5

J

5; 5; 6

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Homework Question 1.08

List each set of isotopes in order of increasing number of neutrons (least to most).

A

At-218

B

Po-218

C

Rn-222

Homework Question 1.09

List each set of isotopes in order of increasing number of neutrons (least to most).

A

C-13

B

N-15

C

O-14

Homework Question 1.10

List each set of isotopes in order of increasing number of neutrons (least to most).

A

Li-7

B

B-8

C

Be-6

Homework Question 1.11

List each set of isotopes in order of increasing number of neutrons (least to most).

A

Pa-234

B

Th-234

C

U-234

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Homework Question 1.13

Use the atomic mass in the periodic table to determine which of the stable isotopes in each set is the predominant one in nature. Match the correct answer.

Premise
Response
1

Li-6; Li-7

A

N-15

2

C-12; C-13

B

L-6

3

N-14; N-15

C

C-13

D

C-12

E

Li-7

F

N-14

Homework Question 1.14

Which of these values for the mass of a neutron is the most precise?

A

1.0087 amu

B

1.009 amu

C

1.008 amu

D

1.01 amu

E

Can’t answer this without knowing the actual experimental value

Homework Question 1.15

How many significant figures are in each of these numbers? Match the correct answer.

Premise
Response
1

0.00142

A

5

2

0.1021

B

7

3

5.02

C

3

4

33.020

D

3

5

100.02

E

3

6

10.00

F

1

7

500

G

4

8

73600

H

5

9

173600.1

I

4

10

802000

J

3

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Homework Question 1.20

Identify and match the appropriate number in the requested unit.

Premise
Response
1

1.078 g in units of mg

A

727

2

1.078 g in units of μg

B

2.54 x 10$^{-5}$

3

1.078 g in units of kg

C

0.727

4

428 nm in units of m

D

1078

5

7.27 x 10$^{-10}$ ​m in units of nm

E

0.001078

6

2.54 x 10$^7$​​cm in units of km

F

1.078 x 10$^6$

G

4.28 x 10$^{-9}$

H

4.28 x 10$^{-7}$

I

254

Homework Question 1.21

Which sample is larger? Match the number that represents the larger of the two values.

Premise
Response
1

1) 1.0 mg or 2) 0.01 g

A

1

2

1) 1.0 μg or 2) 0.01 mg

B

1

3

1) 12 mg or 2) 0.12 g

C

2

4

1) 12 mg or 2) 1200 μg

D

1

E

2

F

2

Homework Question 1.22

Which answer is equivalent to 0.014 g?

A

14 mg

B

1400 μg

C

1.4 x 10$^{-6}$ kg

D

14‚000 μg

E

None of the above

Homework Question 1.23

Which answer is equivalent to 0.016 g?

A

160 x 10$^{-6}$ kg

B

1‚600 μg

C

1.61 x 10$^{-6}$ kg

D

16‚000 μg

E

16.1 mg

Homework Question 1.24

Which relationship is correct?

A

4.1 g > 4200 mg

B

4.2 mg > 4100 μg

C

4.2 ng > 4100 μg

D

All of the above

Homework Question 1.25

True or False: One mole of an element has the same number of atoms as one mole of any other element.

A

True

B

False

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Homework Question 1.28

Which set of elements does not have elements from the same group?

A

Na, K, Li

B

Ar, Ne, He

C

Mg, Cu, Ba

D

Ca, Sr, Mg

E

Kr, Ar, Ne

Homework Question 1.29

Which option best represents the orbitals in which electrons may be found for elements on the third row of the periodic chart?

A

1s, 2s, 2p, 3s, 3p

B

1s, 2s, 2p, 3s

C

1s, 2s, 2p

D

1s, 2s

E

1s

Homework Question 1.30

True or False: The halogens (Group 7A) have one more electron than the previous complete shell.

A

True

B

False

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Homework Question 1.32

Determine the percent value for each case, and match the correct answer.

Premise
Response
1

38 out of 82 points on exam 1

A

68%

2

17 out of 25 points on quiz 1

B

46%

3

57 out of 90 points on exam 2

C

65.5%

4

127 out of 175 points on the final

D

72.6%

E

63%

F

56%

G

48.4%

Homework Question 1.33

The air pollutant nitrogen dioxide NO$_2$ has been measured at 107 ppm in Pleasantville. What is the equivalent level in percent?

A

107

B

10.7

C

1.07

D

0.107

E

0.0107

Homework Question 1.34

Which answer has the forms of radiation listed in order of increasing energy (lowest to highest)?

A

Gamma < ultraviolet < infrared

B

X-ray < microwave < visible

C

Visible < infrared < gamma

D

Microwave < ultraviolet < gamma

E

Infrared < radiowave < gamma