CHEM HOMEWORK

1) ANSWER ALL QUESTIONS HIGHLIGHTED IN YELLOW INSIDE PDF FILE TO SEPERATE WORD.

 

2) INSIDE WORD DOCUMENTS ANSWER QUESTIONS 22 TO 40.

Chemistry 121 – Chemistry in the Modern World

Weekly Worksheet 2

Directions: Answer the following questions using your textbook. Create a separate Word document listing the correct answers (short answer or multiple choice) and submit it in the Assignments folder. Use as a title your name and the week number. For example, I would call this assignment Matton2. Each question is worth 1 point for a total of 40 points.

NEED TO UPDATE TO BETTER REFLECT TEXT. MORE ECO QUESTIONS

Omit Question 14f, Could add in Question 26.

1. Chapter 2, Question 9a

2. Chapter 2, Question 9b

3. Chapter 2, Question 9c

4. Chapter 2, Question 11a

5. Chapter 2, Question 11b

6. Chapter 2, Question 11d – don’t grade!

7. Chapter 2, Question 11e

8. Chapter 2, Question 12a

9. Chapter 2, Question 12b

10. Chapter 2, Question 14a

11. Chapter 2, Question 14d

12. Chapter 2, Question 14e

13. Chapter 2, Question 14f

14. Chapter 2, Question 14g

15. Chapter 2, Question 23

16. Chapter 2, Question 24a

17. Chapter 2, Question 24b

18. Chapter 2, Question 28

19. Chapter 2, Question 33a

20. Chapter 2, Question 33b

21. Chapter 2, Question 39

22. When oxygen, O2, is passed through an electrical spark (lightening is a good natural source of electrical spark), ozone, O3, is formed. When the equation is balanced, the coefficient of oxygen, O2, is,

O2 ( O3

a.

1

b. 2

c. 3

d. 4

23. Relative to the mass of the nucleus, the mass of an electron is,

a. always much smaller.

b. always much larger.

c. essentially the same.

d. variable, depending on the element.

24. While nuclear physicists have discovered over 100 different particles that compose the nucleus of an atom, from a chemistry perspective, the nucleus is best described as being composed of,

a. protons and neutrons packed tightly into a very small volume.

b. protons and electrons packed tightly into a very small volume.

c. neutrons and electrons packed tightly into a very small volume.

d. protons, neutrons and electrons packed tightly into a very small volume.

25. The element tin (

Sn

) occurs naturally as ten isotopes. Each of these isotopes of the elemental form of tin has,

a. 118 protons.

b.

50

neutrons

c. a different number of neutrons.

d. all of the above

26. The sum of protons and neutrons in an atom is called the,

a. Mass number.

b. Atomic number.

c. Electron number.

d. Atomic mass.

27. How many neutrons are in this isotope of tin?

106

50
Sn

a. 106

b. 50

c. 56

d. 156

28. The isotope of carbon commonly referred to as “carbon-14” is

a.
14
6
C

.
b.
12
6
C

.
c.
13
6
C

.
d.
28
14
Si

.
29. The proton has,
a. The same mass and charge of an electron.
b. The same mass and charge of a neutron.
c. Smaller mass and opposite charge as an electron.
d. Larger mass and opposite charge as an electron.
30. The neutron has,
a. the same approximate mass and charge as an electron.
b. the same approximate mass and charge as a proton.
c. the same approximate mass as a proton, but no charge.
d. the same approximate mass as an electron, but no charge.
31. The sum of protons in an atom is called the,
a. mass number
b. atomic number
c. electron number
d. atomic mass
32. Which is a correct description of the organization of subatomic particles in atoms?
a. Protons and electrons are tightly packed into a small nucleus. Neutrons occupy the space outside the nucleus.
b. Protons and neutrons are tightly packed into a small nucleus. Electrons occupy the space outside the nucleus.
c. Neutrons and electrons are tightly packed into a small nucleus. Protons occupy the space outside of the nucleus.
d. Electrons are tightly packed into a small nucleus. Protons and neutrons occupy the space outside of the nucleus.
33. Isotopes are atoms of the same element with,
a. different numbers of protons.
b. different numbers of electrons.
c. different numbers of neutrons.
d. different atomic numbers.
34. The number of protons in any Magnesium, Mg, atom is,
a. 12
b. 13
c. 24
d. 25
35. If X can represent the chemical symbol of any element in the periodic table, then
238
92
X

represents an isotope of,
a. Calcium
b. Lead
c. Uranium
d. Niobium
e. it is impossible to determine which element this is
36. The identity of an element is determined by the ________ in the atom.
a. number of protons
b. number of neutrons
c. number of Electrons
d. charge.
37. As the energy level of an electron increases, the electron’s distance from the nucleus, on average,
a. increases.
b. decreases.
c. remains the same.
d. cannot be determined.
38. Elements in the same group have,
a. the same atomic number.
b. the same number of neutrons.
c. the same number of electrons.
d. the same number of valence electrons.
39. A vertical column in the modern periodic table is called a,
a. period.
b. group.
c. valence
d. metal.
40. The electrons in the outermost energy level of an atom are called
a. group electrons.
b. core electrons.
c. valence electrons.
d. orbital electrons.

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