1. Chemistry: A Molecular Approach, 1st Edition
Nivaldo J. Tro
Chapter 2
Atoms and Elements

2. Which of the following statements about a carbon atom is correct according to the plum-pudding atom model?
Nothing can penetrate a carbon atom.
The carbon atom has a positive charge.
The mass of the carbon atom is the same as the mass of all the electrons in the atom.
The carbon atom has a negative charge.

3. Which of the following statements about a carbon atom is correct according to the plum-pudding atom model?
Nothing can penetrate a carbon atom.
The carbon atom has a positive charge.
The mass of the carbon atom is the same as the mass of all the electrons in the atom.
The carbon atom has a negative charge.

4. How many neutrons are in 1000 atoms of Cl-37?
37,000 20
20,000
cannot be determined

5. How many neutrons are in 1000 atoms of Cl-37?
37,000 20
20,000
cannot be determined

6. The atomic mass of Ga is the average of 68.9 and 71.9.
The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct?
All Ga atoms weigh 69.7 amu.
The atomic mass of Ga is the average of 68.9 and 71.9.
The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu.
68.9 amu, 60.1 %
71.9 amu, 39.9 %

7. The atomic mass of Ga is the average of 68.9 and 71.9.
The mass spectrum of gallium, Ga, is shown below. The atomic mass of Ga is 69.7 amu. Which of the following statements is correct?
All Ga atoms weigh 69.7 amu.
The atomic mass of Ga is the average of 68.9 and 71.9.
The atomic mass of Ga will be closer to 69 than 71 because there are more atoms that weigh 68.9 amu.
68.9 amu, 60.1 %
71.9 amu, 39.9 %

8. Which of the following elements will have properties most similar to Tin, Sn (at. no. 49)?
lead, Pb (82)
gallium, Ga (31)
zinc, Zn (30)
titanium, Ti (22)
arsenic, As (33)

9. Which of the following elements will have properties most similar to Tin, Sn (49)?
lead, Pb (82)
gallium, Ga (31)
zinc, Zn (30)
titanium, Ti (22)
arsenic, As (33) Sn Pb
metal
very malleable
SnO, SnO2
PbO, PbO2
SnCl2, SnCl4
PbCl2, PbCl4

10. Which weighs more, a pea or a marble?
Tro Chemistry: A Molecular Approach

11. Which weighs more, a pea or a marble?
Tro Chemistry: A Molecular Approach

12. Which has more atoms, 10.0 g Mg or 10.0 g Ca?
24.30
40.08
Magnesium
Calcium
Both have the same number of atoms.
Tro Chemistry: A Molecular Approach

13. Which has more atoms, 10.0 g Mg or 10.0 g Ca?
24.30
40.08
Magnesium
Calcium
Both have the same number of atoms.
Tro Chemistry: A Molecular Approach