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Chem Midterm Exam

Total questions: 60

Worksheet time: 10hrs 0mins

Name
Class
Date
1.
An educated guess that has not been tested. 
a)
law
b)
theory
c)
hypothesis
d)
fact
2.
How many variables should you change in an experiment?
a)
none
b)
1
c)
2 or more
d)
depends on the type of experiment
3.

If you were testing how well different dish soaps cleaned grease, the independent variable would be the:

a)

dish type

b)

amount of grease

c)

dish soap type

d)

grease type

4.

Dory set up an experiment to see how the density of different materials affects buoyancy (the ability to float). What is the dependent variable?

a)

the volume (size) of the material

b)

the type of material

c)

the density of the material

d)

the buoyancy of the material

5.

You are testing the time it takes for 3 different liquids to melt. Which variables should stay constant (not change) in your experiment? Check all that apply.

a)

liquid type

b)

liquid amount

c)

container type

d)

heat source

6.

In an experiment, the control group is the "normal conditions" setup that is not being tested on. What is the control group in Homer's experiment?

a)

amount of time the spray stays on the shower

b)

the half of the shower sprayed with water

c)

the half of the shower sprayed with coconut juice

d)

the amount of slime

7.

In an experiment, the experimental group is the setup being tested on. This group will be compared to the control "normal conditions" group. What is the experimental group in Homer's experiment?

a)

drink type

b)

# of paper stacks

c)

Group B

d)

Group A

8.

Chemistry is the study of...

a)

life

b)

matter

c)

motion

9.
What are the 2 characteristics of matter?
a)
volume & energy
b)
mass & energy
c)
volume & mass
d)
matter encompasses all
10.
The amount of space an object takes up. 
a)
volume
b)
mass
c)
matter
d)
energy
11.

The amount of atoms in a substance. (can be measured with a scale)

a)

volume

b)

mass

c)

matter

d)

energy

12.

The building blocks of matter are...

a)

atoms

b)

cells

c)

molecules

d)

compounds

13.
Gas has mass & takes up space.
a)
true 
b)
 false
14.
Which state of matter has a definite volume & an indefinite shape? 
a)
solid
b)
liquid
c)
gas
15.
Which state of matter has indefinite shape & volume?
a)
solid 
b)
liquid 
c)
gas
16.
In which state of matter are the atoms spaced the farthest apart & are the most compressible?
a)
solid 
b)
liquid
c)
gas
17.
Which state of matter has the lowest kinetic energy (atoms move the slowest)?
a)
solid 
b)
liquid
c)
gas
18.
Dry ice is an example of what phase change.
a)
freezing
b)
melting
c)
vaporization/boiling
d)
sublimation
19.
When ice melts does kinetic energy decrease (release heat) or increase (absorb heat)?
a)
kinetic energy decreases & heat is released 
b)
kinetic energy increases & heat is absorbed
20.
What does "#4" represent on the graph? 
a)
melting 
b)
liquid phase
c)
boiling
d)
gas phase
21.
What does "#3" represent on the graph? 
a)
melting
b)
liquid phase
c)
boiling
d)
gas phase
22.
The illustrations shows the spacing of particles in different types of matter. Which illustration is an example of the spacing of particles in solids?
a)
illustration A
b)
illustration B
c)
illustration C
d)
illustration D
23.
A group of friends gather around a fire to stay warm.
a)
conduction
b)
convection
c)
radiation
24.
Walking on the warm sand sand with your bare feet.
a)
conduction
b)
convection
c)
radiation
25.
The warm air from this heater creates a current when the warm air rises and the cold air sinks.
a)
conduction
b)
convection
c)
radiation
26.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)

low to low

27.

A conductor transfers heat and/or electricity well. What is the BEST example of a conductor?

a)

A wooden block

b)

A ceramic mug

c)

A glass cup

d)

A metal bowl

28.

An insulator slows the transfer heat and/or electricity. What is the BEST example of an insulator?

a)

A nail

b)

A ceramic mug

c)

A pan

d)

A metal bowl

29.

Which property describes matter as moldable/bendable?

a)

reflectivity

b)

transparency

c)

malleable

d)

brittle

30.

Which property describes matter as breakable?

a)

reflectivity

b)

transparency

c)

malleable

d)

brittle

31.

Which property of matter describes the transfer of heat and/or electricity through a material or substance?

a)

reflectivity

b)

transparency

c)

magnetism

d)

conductivity

32.

Which unit measures mass?

a)

grams (g)

b)

milliliters (mL) or centimeters (cm3)

c)

meters (m)

d)

Celcius (oC)

33.

Which unit measures volume?

a)

grams (g)

b)

milliliters (mL) or centimeters (cm3)

c)

meters (m)

d)

Celcius (oC)

34.
What is the volume of this rectangular prism?
a)
60 cubic centimeters
b)
15 cubic centimeters
c)
20 cubic centimeters
d)
6 cubic centimeters
35.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
36.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
37.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
38.
A crayon has a mass of 10g and volume of 5 mL. What is the density?
a)
30 g/mL
b)
15 g/mL
c)
1 g/mL
d)
2 g/mL
39.

Buoyancy is the ability to float. Which properties affect buoyancy?

(select all that apply)

a)

Mass

b)

Volume

c)

Density

d)

Reflectivity

40.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1, 
d)
4, 3, 1, 2
41.
Helium balloons rise on earth because
a)
helium is less dense than air
b)
helium is more dense than air
c)
helium is cooler than air
d)
helium is warmer than air
42.

The atomic number identifies the number of __________.

a)

electrons

b)

atoms

c)

protons

d)

neutrons

43.

Identify #1

a)

proton

b)

neutron

c)

electron

d)

nucleus

44.

Identify #2

a)

proton

b)

neutron

c)

electron

d)

nucleus

45.

Identify #3

a)

proton

b)

neutron

c)

electron

d)

nucleus

46.

Identify #4

a)

proton

b)

neutron

c)

electron

d)

nucleus

47.

How do you find the atomic mass # of an atom?

a)

protons + neutrons

b)

protons + electrons

c)

electrons + neutrons

d)

# of protons

48.

The max amount of electrons that can be held on the 1st & 2nd energy levels of an atom are _____ and _____.

a)

2, 4

b)

4, 8

c)

2, 8

d)

4, 6

49.

How long is line segment K?

a)

3 mm

b)

3 cm

c)

4 cm

d)

6 mm

50.

What is the temperature shown?

a)

12 ⁰F

b)

15 ⁰F

c)

-12 ⁰F

d)

14 ⁰F

51.

Which of the following pieces of equipment measures VOLUME?

a)
b)
c)
d)
52.

What does this piece of equipment measure?

a)

Area

b)

Volume

c)

Temperature

d)

Mass

53.
What was the dependent variable in this experiment?
a)
Force
b)
Stretch Distance
c)
Type of Spring Used
54.
What was the independent variable in this experiment?
a)
Force
b)
Stretch Distance
c)
Type of Spring Used
55.

An ice cream cone melts in a kid's hand while walking outside on a hot summer day. What is this an example of?

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

56.

Helium is an element that is unreactive (not reactive). What is this an example of?

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

57.

Mercury is a metal that is liquid at room temperature. What is this an example of?

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

58.

A student rips up his exam paper in frustration. What is this an example of?

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

59.

A metal bike rusts as a result of being exposed to air and moisture. What is this an example of?

a)

Physical property

b)

Chemical property

c)

Physical change

d)

Chemical change

60.

How hard was this exam?

a)

Super Easy!

b)

Not bad, understood most of it.

c)

Kind of hard, understood about 50%.

d)

Crazy hard!

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