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Atomic Theory Review (lvl)

Total questions: 33

Worksheet time: 8hrs 15mins

Name
Class
Date
1.

Thompson's model of negative electrons randomly distributed through a positively charged matrix is called the -

a)

plum pudding model

b)

atomos

c)

bohr model

d)

gold foil model

2.

_____ was the scientist who developed and used the gold foil experiment.

a)

John Dalton

b)

JJ Thompson

c)

Niels Bohr

d)

Earnest Rutherford

3.

What ideas did Rutherford get from his gold foil experiment?

a)

Atoms are mostly empty space

b)

The positive charge of an atom is concentrated in a very small area

c)

The nucleus is the positive center of the atom

d)

All of the above

4.

The "planetary model", showing electrons orbiting the nucleus, was developed by -

a)

Ernest Rutherford

b)

JJ Thompson

c)

Niels Bohr

d)

James Chadwick

5.
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
6.
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
7.

In 1911 I discovered that atoms have a positive particle called proton.

a)

Dalton

b)

Rutherford

c)

Chadwick

d)

Bohr

8.
First scientist to come up with atomic theory. We still use his atomic characteristics today. 
a)
Dalton
b)
Bohr
c)
Chadwick
d)
Rutherford
9.

This particle is found in the nucleus and has no charge

a)

Neutron

b)

Proton

c)

Electron

d)

Atom

10.

This particle is found in the nucleus and has a positive charge

a)

Electron

b)

Proton

c)

Neutron

d)

Atom

11.

This is a negatively charged particle found outside the nucleus

a)

Electron

b)

Proton

c)

Neutron

d)

Atoms

12.

The first person to ever talk about an atom was

a)

Democritus

b)

Rutherford

c)

Dalton

d)

Thomson

13.

The atomic number for Oxygen is 8, so

a)

there are 8 protons in the atom

b)

the atomic mass is less than 8

c)

the mass of the atom is 8

d)

there are 8 electrons

14.

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

15.

An element that has a different number of neutrons is called an ________________

a)

Atomic Mass

b)

Isotope Number

c)

Isotope

d)

Mass Number

16.

The total mass of _________ and _________ is the atomic mass number.

a)

Negative : Positive

b)

Neutrons : Protons

c)

Electrons : Protons

d)

Nucleus : Protons

17.
A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass
a)
Electron Shells
b)
Orbitals
c)
Electron Cloud
d)
Nucleus
18.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
5
19.
How many protons does this isotope of titanium have?
a)
48
b)
22
c)
26
20.
If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its atomic mass is:
a)
16
b)
32
c)
48
21.
What is the name of the pictured isotope?
a)
Copper-29
b)
Copper-63
c)
Copper-34
d)
CopperWopperHopperBopper
22.

Which of the following are isotopes?

a) 14 7X b) 14 6X c) 15 7X d) 15 8X

a)

a) and b)

b)

a) and c)

c)

c) and d)

d)

a) and d)

23.
How is carbon-12 different from carbon-14?
a)
They have a different number of protons
b)
they have a different number of electrons
c)
they have a different number of neutrons
24.
What do carbon-12 and carbon-14 have in common?
a)
they have same number of protons
b)
they have the same number of neutrons
c)
they have the same atomic mass
d)
they have the same atomic weight
25.
What can you conclude about carbon-14 from its name?
a)
It has 14 electrons
b)
it has 14 neutrons
c)
it has 14 protons
d)
it has an atomic mass of 14 u
26.

12 protons and 13 neutrons

a)

Mg-12

b)

Mg-13

c)

Mg-25

d)

Mg-24.305

27.

Calcium has the atomic number 20. If it has a mass number of 46, how many neutrons are present?

a)

46

b)

20

c)

26

d)

We cannot tell

28.

The difference between a chemical and physical change is that...

a)

A chemical change makes a new substance and a physical change doesn't

b)

A physical change makes a new substance and a chemical change doesn't

c)

There is no difference between a chemical and physical change

d)

A chemical change makes something new and a physical change can only be measured microsopically

29.

Select all of the PHYSICAL changes..

a)

Vinegar mixed with baking soda makes gas

b)

Freezing water makes ice

c)

Ripping a piece of paper in half

d)

Grinding salt into a powder

e)

Leaving hydrogen peroxide out decomposes into water and gas

30.

Select all of the CHEMICAL changes..

a)

Vinegar mixed with baking soda makes gas

b)

Freezing water makes ice

c)

Ripping a piece of paper in half

d)

Grinding salt into a powder

e)

Leaving hydrogen peroxide out decomposes into water and gas

31.

Measurements: 24.9, 25.2, 25.1, 24.8

True Value: 25.0

These measurements are…

a)

Accurate, but not precise

b)

Precise, but not accurate

c)

Both precise and accurate

d)

Neither precise nor accurate

32.

Measurements: 2.5, 14.5, 10.1, 45.3

True Value: 25.0

These measurements are…

a)

Accurate, but not precise

b)

Precise, but not accurate

c)

Both precise and accurate

d)

Neither precise nor accurate

33.

WHAT IS THE VOLUME?

a)

20.15

b)

20.1

c)

21.5

d)

21.50

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