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Chemistry Midterm

Total questions: 51

Worksheet time: 38mins

Name
Class
Date
1.
A mixture that is NOT evenly distributed is called ....
a)
Compounded
b)
Homogenous
c)
Heterogenous
d)
Salty
2.

Are made from a combination of 2 or more elements in a constant ratio...

a)

Atoms

b)

Mixtures

c)

Compounds

d)

Elements

3.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
4.
What units can be used to express density?
a)
g/mL
b)
grams
c)
millimeters
d)
milliliters
5.

A bar of copper has a mass of 216 g and a volume of 24 cm3. What is the density of copper?

a)

9 g/cm3

b)

.11 g/cm3

c)

5184 g/cm3

d)

322 mL

6.
What kind of properties can only be observed when a substance changes into a different substance?
a)
physical properties
b)
chemical properties
7.
Properties that can be observed without changing the identity of the substance.
a)
Physical
b)
Chemical
8.
Example for chemical property
a)
color
b)
hardness
c)
toxicity
d)
solubility
9.
Example for physical property
a)
melting point
b)
flammability
c)
reactivity 
d)
combustion
10.
Example for chemical property
a)
malleability
b)
texture
c)
combustion
d)
sour taste
11.

Rutherford discovered what through his Gold-Foil experiment?

a)

The proton

b)

The neutron

c)

The electron

d)

The nucleus

12.

Thomson concluded that cathode rays have a negative charge. Why did his experiment lead him to this conclusion?

a)

Opposite charges attract

b)

Like charges attract

c)

Opposite charges repel

d)

Like charges repel

13.

In his experiment, Rutherford concluded that atoms have a nucleus because

a)

most of the particles went straight through the foil.

b)

some of the particles were deflected near the front of the screen.

c)

some of the particles were deflected back towards the alpha source.

d)

not enough information is given.

14.
Isotopes of the same element have different ____________. 
a)
 numbers of protons  
b)
numbers of electrons
c)
 symbols 
d)
numbers of neutrons
15.
The atomic number of an atom or ion refers to the number of:
a)
neutrons
b)
protons
c)
nucleons
d)
electrons
16.

How many electrons does potassium K contain?

a)
19
b)
39
c)
20
d)
40
17.
How many neutrons does the isotope of lithium have?
a)
8
b)
3
c)
4
d)
5
18.
which explanation of this notation is correct?
a)
 12 is proton #
b)
6 tells you there are 6 neutrons
c)
6 tells you there are 6 protons
d)
12 is not a mass # here
19.
which explanation of this notation is correct?
a)
 12 is proton #
b)
6 tells you there are 6 neutrons
c)
6 tells you there are 6 protons
d)
12 is not a mass # here
20.

What do these isotopes all have in common?

a)

neutrons & mass number

b)

atomic number and neutrons

c)

atomic number and electrons

d)

protons, atomic number, and mass number

21.
Which particles are found in the nucleus
a)
electrons and protons
b)
neutrons and protons
c)
neutrons and electrons
d)
footballs and soccer balls
22.

What element is represented in this Bohr Model?

a)

Carbon

b)

Hydrogen

c)

Aluminum

d)

Lithium

23.
What is the name of this element?
a)
Lithium
b)
Boron
c)
Carbon
d)
Neon
24.
An element with five valence electrons is
a)
phosphorus
b)
oxygen
c)
beryllium
d)
rubidium
25.
What's a valence electron?
a)
electrons in the second energy level
b)
electrons in the outermost energy level
c)
the atomic number
d)
electrons in the first level
26.

When can atoms emit photons?

a)

When the electron is in the ground state

b)

When the electron is in the excited state

c)

When an electron is going from the ground state to the excited state

d)

When an electron is going from the excited state to the ground state

27.

Which energy state has more energy?

a)

Ground State

b)

Excited State

28.

What is happening in the picture

a)

An atom is absorbing energy to go to a higher state

b)

An atom is emitting a photon to go to a lower state

c)

The atom is losing an electron

d)

The atom is losing a proton

29.
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
a)
Zinc
b)
Copper
c)
Nickel
d)
Germanium
30.
Why did the alpha particle (positively charged particle) sometimes bounce back when hitting the gold foil.
a)
hit neutron in nucleus and they repelled alpha particle
b)
hit proton in nucleus and they repelled alpha particle
c)
hit electrons in electron shells and they repelled alpha particle
31.
What atom matches this electron configuration?
1s22s22p63s2
a)
Neon
b)
Magnesium
c)
Aluminum
d)
Potassium
32.
What electron configuration matches an oxygen atom?
a)
1s22s22p63s2, 3p64s23d104p5
b)
1s22s22p4
c)
1s22s22p6
d)
1s22s22p63s23p64s23d1
33.
When an atom loses an electron, it becomes a:
a)
positive ion
b)
negative ion
c)
neutral ion
d)
neutral atom
34.

An atom's atomic number represents the

a)

number of neutrons

b)

number of protons

c)

number of electrons

d)

number of voltrons

35.
How many significant figures does the following number have: 2001800.
a)
1
b)
4
c)
6
d)
7
36.
A cube has a volume of 8.0cm3 and a mass of 21.6g. What is the density of the cube in grams per cubic centimeters. 
a)
2.7
b)
.37
c)
2.70
d)
0.370
37.
An element with a mass number of 11 and an atomic number of 5 has how many neutrons?
a)
11
b)
5
c)
6
d)
16
38.
An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.
a)
20
b)
10
c)
5
d)
25
39.

How many significant figures are there in 125 meters?

a)

1

b)

2

c)

3

d)

4

40.

How many significant figures are there in 1008 grams?

a)

1

b)

2

c)

3

d)

4

41.

How many significant figures are there in 10 liters?

a)

1

b)

2

c)

3

d)

4

42.

How many significant figures are there in 0.0054 grams?

a)

1

b)

2

c)

3

d)

4

43.

A physical blend of 2 or more components is called a ____.

a)

type of element

b)

mixture

c)

chemical reaction

d)

physical property

44.

What type of material is pictured?

a)

Element

b)

Compound

c)

Heterogeneous mixture

d)

Homogeneous mixture

45.

What type of material is pictured?

a)

Element

b)

Compound

c)

Homogeneous mixture

d)

Heterogeneous mixture

46.

6 kg = _____ g

a)

6

b)

6000

c)

600

d)

.006

47.

648 g = ____ mg

a)

6,480

b)

64,800

c)

648,000

d)

64.8

48.

240 cm = ___________ m

a)

2400

b)

24

c)

2.4

d)

0.24

49.

3 km = ___________ mm

a)

30

b)

300

c)

3,000

d)

3,000,000

50.

68 cm = ___________ mm

a)

0.68

b)

6.8

c)

68

d)

680

51.

15 m = _____ mm

a)

15,000

b)

1,500

c)

0.015

d)

150

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