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Chemistry Midterm 2020

Total questions: 40

Worksheet time: 28mins

Name
Class
Date
1.
How many significant figures does the following number have: 2001800.
a)
1
b)
4
c)
6
d)
7
2.
The majority of elements on the periodic table are
a)
man made.
b)
nonmetals.
c)
metals.
d)
gases.
3.
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
4.
To determine density of a irregular shape a student immersed the object in 21.2mL of water and caused the water to rise to 27.8mL. If the object mass is 22.4g, what is the density?
a)
27.8g/mL
b)
3.0g/mL
c)
6.6g/mL
d)
3.4g/mL
5.
In the modern periodic table elements are arranged by:
a)
atomic mass
b)
atomic number
c)
valence electrons
d)
number of isotopes
6.
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
7.
An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.
a)
20
b)
10
c)
5
d)
25
8.
Which two subatomic particles make up the nucleus of an atom?
a)
Protons and Electrons
b)
Neutrons and Electrons
c)
Electrons and Protons
d)
Protons and Neutrons
9.

Rutherford's gold foil experiment provided evidence that...

a)

Negative and positive charges are spread evenly throughout the atom.

b)

Alpha particles have a positive charge.

c)

Gold is not a dense as previously thought.

d)

There is a dense positively charged nucleus at the center of an atom & the rest is mostly empty space

10.

Which graph shows the correct relationship between temperature and kinetic energy?

a)

A

b)

B

c)

C

d)

D

11.

What is the total mass in grams of the object being measured?

a)

460.62

b)

466.20

c)

466.62

d)

460.20

12.

What is the correct reading of the thermometer in Celsius?

a)

5

b)

4.3

c)

.3

d)

4

13.

A sample of water is being heated from 20C to 30C and temperature is being recorded every 2 minutes. Which table would be best for recording the data?

a)

A

b)

B

c)

C

d)

D

14.

Which element is liquid at room temperature?

a)

K

b)

I

c)

Hg

d)

Mg

15.
Which line segment of the graph represents boiling?
a)
line AB
b)
line BC
c)
line CD
d)
Line DE
16.

Which element exists as a monoatomic gas (by itself) molecule at STP?

a)

nitrogen

b)

bromine

c)

barium

d)

neon

17.

which atom has a nucleus that contains 13 protons and 14 neutrons?

a)

Mg

b)

Be

c)

Al

d)

N

18.

What phase change is endothermic?

a)

L->S

b)

G->L

c)

S->G

d)

L->S

19.

A gas occupies a volume of 444mL at 273K and 79.0kPa. What is the final temperature when the volume of the gas is changed to 1880mL and pressure drops to 38.7kPa?

a)

315K

b)

292K

c)

566K

d)

2360K

20.

When the vapor pressure of a liquid equal the pressure on its surface, the liquid will

a)

sublime

b)

boil

c)

solidify

d)

melt

21.

a gas occupies 15.0L at a pressure of 2.00atm and a temp of 300K. If the pressure drops to 1.00atm and temp raised to 400K. What is the new volume?

a)

5.43L

b)

10,0L

c)

22.5L

d)

40.0L

22.

what is the first phase change that is most likely to occur as the pressure on Nitrogen gas is increased as temperature decreases?

a)

evaporation

b)

condensation

c)

crystallization

d)

solidification

23.

What which point do a liquid and a solid exist at equilibrium?

a)

sublimation point

b)

boiling point

c)

vaporization point

d)

melting point

24.

Which part of the atom is overall positive?

a)

electrons

b)

first shell

c)

valence shell

d)

the nucleus

25.

Which type of matter can not be broken down by a chemical change?

a)

element

b)

mixture

c)

solution

d)

compound

26.

which sample is a mixture?

a)

air

b)

manganese

c)

ammonia

d)

water

27.

1 gram of liquid water and 1 gram of solid water have different?

a)

masses

b)

properties

c)

empirical formula

d)

molar mass

28.

What substance can not be broken down by a chemical change?

a)

butanal

b)

gold

c)

propene

d)

water

29.

a)

10

b)

80

c)

40

d)

10

30.

a)

A

b)

B

c)

C

d)

D

31.

a)

A

b)

B

c)

C

d)

D

32.

a)

A

b)

B

c)

C

d)

D

33.

a)

A

b)

E

c)

G

d)

J

34.

a)

A

b)

B

c)

C

d)

D

35.

a)

nitrogen

b)

hydrogen

c)

magnesium

d)

krypton

36.

a)

a

b)

b

c)

c

d)

d

37.

a)

increase & PE increases

b)

decreases & PE increases

c)

remains the same & PE increases

d)

remains the same & PE decreases

38.

a)

AB

b)

BC

c)

CD

d)

DE

39.

which particles have about the same mass?

a)

proton & neutron

b)

proton & electron

c)

neutron & electron

d)

neutron & positron

40.

Temp of 100mL of a gas at 200K is increased to 400K. What is the new volume?

a)

50

b)

100

c)

200

d)

400

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