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Unit 1 Half Point Review

Total questions: 45

Worksheet time: 40mins

Name
Class
Date
1.

Salt is a _________.

a)

compound

b)

element

c)

homogeneous mixture

d)

heterogeneous mixture

2.

Which of the following is NOT a compound?

a)
HCl
b)
Cl
c)
NaCl
d)
CO2
3.

What is soda?

a)

Element

b)

Compound

c)

Mixture

4.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
5.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
6.

Terry sees an old rusty swing set at the park. He knows that rust is formed when iron (Fe) combines with oxygen (O) in the atmosphere to form iron oxide (FeO). How would you classify iron oxide?

a)

compound

b)

element

c)

mixture

7.

Classify the Sample.

a)

Pure Substance

b)

Mixture of Elements

c)

Mixture of Compounds

d)

Mixture of Elements and Compounds

8.

Some common substances used in the laboratory are listed in the table. The chemical formulas of the substances are also listed beside their names. How many of the listed items are elements?

a)

3

b)

4

c)

5

d)

6

9.

Which image(s) would be considered pure substances?

a)

I

b)

I and II

c)

III and V

d)

IV

10.

Compounds are formed when two or more ________________________ are chemically combined.

a)

elements

b)

properties

c)

compounds

11.

In the classification of matter chart, letter B. would be a(n):

a)

element

b)

compound

c)

mixture

d)

solution

12.
Is wood burning a physical or chemical change?
a)
Physical 
b)
Chemical
13.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
14.

Which of the following are examples of a Chemical Change?

a)

Iron Rusting

b)

Gas Burning

c)

Breaking a glass

d)

Boiling water

e)

Burning Wood

15.
Which example best describes a physical change?
a)
iron rusting
b)
charcoal burning
c)
an ice cube melting
d)
a marshmallow burning
16.
Is Gatorade powder dissolving in water physical or chemical change?
a)
Physical 
b)
Chemical
17.

An attraction between molecules of different substances is called...

a)

adhesion

b)

cohesion

18.

A measure of how difficult it is to stretch or break the surface of a liquid is called...

a)

specific heat

b)

polar molecule

c)

capillary action

d)

surface tension

19.

A process powered by adhesion that causes water molecules to move upward through a narrow tube such as the stem of a plant is called...

a)

polar molecule

b)

surface tension

c)

capillary action

d)

specific heat

20.
As you added drops to the coins, each drop stuck to the other water because of ________________.
a)
adhesion
b)
cohesion
c)
capillary action
d)
specific heat
21.

Capillary Action is key for

a)

Water moving from roots to leaves in plants

b)

Air moving from mouth to lungs

c)

Ice floating on water

d)

Water moving to lower areas

22.

Spongebob is baking a cake and notices water droplets forming on the outside of the cup. What is causing the water droplets to stick to the cup?

a)

cohesion

b)

adhesion

c)

surface tension

23.

A substance that cannot be broken down further chemically is known as...

a)

an element

b)

a compound

c)

a molecule

d)

a mixture

24.

The helium in this balloon is an element. Which statement must be true?

a)

Helium gas is made up of many kinds of molecules.

b)

Helium molecules have more than one kind of atom.

c)

Helium molecules have only one kind of atom.

25.

What would happen if surface tension did not exist?

a)

Small objects would easily sink

b)

Water would evaporate slower

c)

Water would freeze faster

26.

This picture represents the atoms in plaster of paris. Which statement is true?

a)

It is a mixture because it is made of different kinds of molecules.

b)

It is a compound because it is a pure substance with each molecule made of 2 or more atoms.

c)

It is an element because it is a pure substance with each molecule made of only one atoms.

27.

A __________ is the smallest particle in a chemical element or compound. It is made up of two or more atoms.

a)

molecule

b)

element

c)

atom

28.
Based off of the image, what type of matter is shown?
a)
gas
b)
solid
c)
liquid
29.

Which diagram best represents a homogenous mixture?

a)

b)

c)

d)

30.

Which is an example of a pure substance?

a)

air

b)

diamond

c)

milk

d)

cereals with milk

31.

The chemical formula for carbon monoxide is COCO  while carbon dioxide is  CO2CO_2  . What does the subscript in oxygen (O) indicate?

a)

the number of oxygen atoms in each substance

b)

the number of mixtures that the oxygen is forming

c)

 the number of compounds that the oxygen is forming

d)

 whether the oxygen is forming a compound or a mixture

32.

How many atoms of Carbon are in this formula? C6 H12O6C_{6\ }H_{12}O_6  

a)

6

b)

1

c)

12

33.

 Steel 

a)

 Heterogeneous 

b)

 Homogeneous 

c)

 Compound 

d)

Element

34.
Why does water move from the roots to the leaves of plants through the plants' tiny tubes?
a)
specific heat 
b)

capillary action

c)

atoms

d)
density
35.

Which diagram best represents a heterogeneous mixture?

a)

b)

c)

d)

36.

Are these particles in a solid, liquid, or gas?

a)

Solid

b)

Liquid

c)

Gas

37.
Liquid matter takes the shape of _______.
a)
a gas
b)
water
c)
a pet
d)
Its container
38.
Crystal Light Fruit Punch or Kool Aid Fruit Punch when mixed with water results in an evenly distributed substance which is a(n)
a)
Element
b)
Compound
c)
Homogeneous Mixture
d)
Heterogeneous Mixture
39.

Which of the following statements correctly explains the difference between the two mixtures in the diagram below?

a)

Mixture 1 is homogeneous because the different particles are unevenly distributed

b)

Mixture 1 is heterogeneous because the different particles are evenly distributed

c)

Mixture 2 is homogeneous because the different particles are unevenly distributed

d)

Mixture 2 is homogeneous because the different particles are evenly distributed

40.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
41.
Water droplets take a spherical shape (as pictured) because of ____________
a)
adhesion
b)
cohesion
c)
capillary action
d)
solubility
42.

TRUE or FALSE? The surface tension of all liquids is exactly the same (i.e. water has the same surface tension as oil).

a)

TRUE

b)

FALSE

43.
Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?
a)
The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
b)
The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.
c)
The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
d)
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
44.

Explain how surface tension makes it possible for small insects, such as water striders, to walk on water.

a)

Surface tension creates a solid surface

b)

Surface tension reduces the weight of the insect

c)

Surface tension allows the insect to float

d)

Surface tension creates a film on the water surface

45.

Water spreading and soaking in "wetting" a surface is an example of which phenomenon?

a)

Cohesion

b)

Adhesion

c)

Surface Tension

d)

Sublimation

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