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1.2 AP and Chemistry Unit 3

Total questions: 56

Worksheet time: 3625secs

Name
Class
Date
1.

Which subatomic particles have a negative charge?

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

2.

Subatomic particles with a positive charge

a)

neutrons

b)

atomic mass

c)

protons

d)

isotopes

3.

These are found in the nucleus and have a neutral charge.

a)

Proton

b)

Electron

c)

Neutron

4.

What distinguishes a neutral atom from an ion?

a)

A change in the number of protons.

b)

A change in the number of neutrons.

c)

A change in the number of electrons.

d)

A change in the number of quarks.

5.

What is the smallest particle of an element that still retains the properties of the element?

a)

A nucleus.

b)

A proton.

c)

A neutron.

d)

An atom.

6.

To determine what element an atom is, you must look at the number of ______________.

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

7.

The atomic number is equal to the number of _____________.

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

8.

What is the atomic number of carbon?

a)

5

b)

6

c)

7

d)

8

9.

What is the mass number?

a)

Total number of protons and electrons.

b)

Total number of electrons and neutrons.

c)

Total number of protons and neutrons.

d)

Total number of protons, neutrons, and electrons.

10.

What is the mass number of a Helium atom that has three neutrons?

a)

2

b)

3

c)

4

d)

5

11.

Isotopes are atoms of the same element that differ in their number of ______________.

a)

Protons

b)

Neutrons

c)

Electrons

d)

Quarks

12.

What is the symbol of an element with 20 protons?

a)

Be

b)

Sb

c)

Ca

d)

Cs

13.

An atom contains 5 protons, 5 neutrons, and 5 electrons. What is the mass number of the atom?

a)

5

b)

10

c)

15

d)

20

14.

All atoms of the same element must contain the same number of _______________.

a)

Protons

b)

Neutrons

c)

Electrons and protons

d)

Protons and neutrons

15.

Isotopes of a given element contain _____________.

a)

The same number of neutrons but a different number of protons.

b)

The same number of neutrons and protons.

c)

The same number of protons but a different number of neutrons.

d)

The same number of protons but a different number of electrons.

16.

An atom with 16 protons and 18 neutrons is an isotope of which element?

a)

Cu

b)

P

c)

S

d)

Ar

17.

What is a positive ion called?

a)

anion

b)

cation

c)

isotope

d)

covalent

18.

If an atom loses electrons, will the charge be positive?

a)

True

b)

False

19.

A Bromine ion gains 1 electron. Which of the following is the correct symbol for a Bromine ion?

a)

Br-1

b)

Br+1

c)

Br+7

d)

Br-7

20.

An atom becomes _________ when it gains electrons.

a)

Positive

b)

Negative

c)

Neutral

d)

Invisible

21.

What do all these isotopes of carbon have in common?

a)

neutrons & mass number

b)

atomic number and neutrons

c)

atomic number and electrons

d)

protons, atomic number, and mass number

22.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
23.

Which atom has 4 neutrons?

a)

Li-6

b)

Li-7

c)

Li-8

d)

They all have the same number of neutrons

24.

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?

I. 7735X

II. 7733X

III. 8137X

IV. 8135X

a)

I and II

b)

III and IV

c)

I and IV

d)

I and III

25.
Which of these is the proton.
a)
A
b)
B
c)
C
d)
None
26.
Which of the following particles has the smallest mass?
a)
neutron
b)
proton
c)
nucleus
d)
electron
27.

Calculate the average atomic mass of silver.

a)

106.38649amu

b)

111.91896amu

c)

107.8677amu

d)

121

28.
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
a)
9.012, Beryllium
b)
12.011, Carbon
c)
6.941, Lithium
d)
10.812, Boron
29.
Compute the average atomic mass for silicon:
a)
27.977
b)
28.09
c)
28.976
d)
The average mass cannot be determined from provided information.
30.
An isotope has three forms.  30% have a mass of 4 amu, 20% have a mass of 5 amu and 50% have a mass of 3 amu.  Average atomic mass will be closest to
a)
2 amu
b)
3 amu
c)
4 amu
d)
5 amu
31.
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
a)
74.92 amu
b)
24.97 amu
c)
75.01 amu
d)
74.51 amu
32.

The name for a substance containing 76 protons and 114 neutrons is

a)

Osmium-114

b)

Osmium-76

c)

Osmium-190

33.

Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.

a)
true
b)
false
34.
In a correctly written symbol what would be located in the "A" position?
a)
number of neutrons
b)
atomic number
c)
number of electrons 
d)
mass number
35.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
d)
70
36.

How many protons does the isotope of lithium have?

a)
8
b)
3
c)
4
d)
5
37.
What do the peaks on the mass spectrum represent?
a)
anions
b)
different isotopes
c)
atoms with differing numbers of electrons
d)
numbers of electrons
38.
Which element does this mass spectrum most likely represent?
a)
neon
b)
scandium
c)
boron
d)
sodium
39.
What do the heights of the peaks represent in the mass spectrum?
a)
number of isotopes
b)
relative abundance of each isotope
c)
average atomic mass
d)
charge:mass ratio
40.
How many isotopes are shown in this mass spectrum?
a)
1
b)
84
c)
86
d)
4
41.
What do you expect the molar mass to be for this element?
a)
91.4 g/mol
b)
90.0 g/mol
c)
4 g/mol
d)
50. g/mol
42.
How many isotopes of this element are shown in the mass spectrum?
a)
98
b)
7
c)
100
d)
95.9 g/mol
43.
Use your periodic table.  There are two isotopes of rubidium: 85Rb and 87 Rb. Which is more abundant?
a)
equally abundant
b)
rubidium-85
c)
rubidium-85.47
d)
rubidium-87
44.
Carbon has three known isotopes. Which is the most abundant?
a)
carbon-12.011
b)
carbon-12
c)
carbon-13
d)
carbon-14
45.
What is the average atomic mass for this element?
a)

10.199 amu

b)
10.8 amu
c)
19.9 amu
d)
11 amu
46.

Isotopes of an element differ from each other in mass because they have different numbers of (a)   .

47.

Ions of an element differ from each other in charge because they have different numbers of (a)   .

48.

Atomic mass is

a)

a weighted average

b)

protons + neutrons

49.

If you change the number of protons an element has, you will change its (a)   .

(HINT: STARTS WITH THE LETTER i AND ENDS WITH A y)

50.
What is the number of protons?
a)
34
b)
16
c)
18
d)
S
51.
What is the number of neutrons?
a)
34
b)
79
c)
45
d)
35
52.

Having 7 protons and 10 electrons is

a)

nitrogen with a -3 charge

b)

nitrogen with a +3 charge

c)

neon with a -3 charge

d)

neon with a +3 charge

53.

Aluminum with a +3 charge has

a)

13 protons and 10 electrons

b)

13 protons and 13 electrons

c)

10 protons and 13 electrons

54.

Phosphorus with a -3 charge has

a)

15 protons and 18 electrons

b)

18 protons and 15 electrons

c)

18 protons and 10 electrons

55.

 Carbon-14 has

a)

6 protons and 6 neutrons

b)

6 protons and 8 neutrons

c)

4 protons and 6 neutrons

d)

14 protons and 14 neutrons

56.

13756\frac{137}{56} Ba+2 has

a)

56 protons, 137 neutrons, and 54 electrons

b)

56 protons, 81 neutrons, and 58 electrons

c)

56 protons, 81 neutrons, and 54 electrons

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