Question 21
A student looks up an element on the periodic table. The table says that the atomic number of the element is 12 and the mass number of the element is 40. What information do these two numbers convey about the element?
a
The element has 40 protons and 12 neutrons
b
The element has 12 protons and 12 neutrons
c
The element has 12 protons and has 28 neutrons
d
The element has 28 protons and 40 neutrons
Question 22
In all elements in a group, the thing that is the same is the:
a
Number of electrons in the valence shell
b
Number of electrons
c
Number of protons
d
Number of neutrons
Question 23
How many oxygen atoms are in the compound below:
a
6
b
2
c
4
d
8
Question 24
Match each description to the correct type of bond.
Column A
1.
:
2.
A bond in which electrons are transferred from one atom to another.:
A bond in which electrons are transferred from one atom to another.
3.
:
4.
What type of bond is represented in the picture?
:
What type of bond is represented in the picture?
5.
A bond in which electrons are shared between two atoms.:
A bond in which electrons are shared between two atoms.
6.
A bond between two nonmetals:
A bond between two nonmetals
7.
A bond between an metal and a nonmetal.:
A bond between an metal and a nonmetal.
8.
The bond between Calcium and oxygen in calcium oxide.:
The bond between Calcium and oxygen in calcium oxide.
9.
The bond between carbon and oxygen in carbon monoxide.:
The bond between carbon and oxygen in carbon monoxide.
10.
A type of bond formed between positively charged metal atoms in which free electrons are shared.:
A type of bond formed between positively charged metal atoms in which free electrons are shared.
Column B
a.Metallic bond
b.Ionic Bond
c.Covalent Bond
Question 25
The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
a
10o g - no change
b
12.5 g
c
25 g
d
50 g
Question 26
What happens to the volume of a gas when the temperature is decreased?
a
The volume increases.
b
The volume decreases.
c
The mass decreases.
d
The pressure increases.
Question 21: c. The element has 12 protons and has 28 neutrons.
Question 22: a. Number of electrons in the valence shell.
Question 23: c. 4
Question 24:
1. c. Covalent Bond
2. b. Ionic Bond
3. a. Metallic bond
4. b. Ionic Bond
5. c. Covalent Bond
6. c. Covalent Bond
7. b. Ionic Bond
8. b. Ionic Bond
9. c. Covalent Bond
10. a. Metallic bond
Question 25: c. 25 g
Question 26: b. The volume decreases.