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Elements, Compounds, and Mixtures

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

The chart below lists some substances and their symbols. How many of these substances are examples of elements?

a)

1

b)

2

c)

3

d)

4

2.

What is the relationship between molecules and atoms?

a)

Molecules are combinations of two or more atoms.

b)

Molecules are the parts that make up atoms

c)

Molecules are the gaseous parts of atoms

d)

Molecules are atoms that have a positive charge

3.

In the diagrams provided, the circles of different colors represent the atoms of different elements. Which diagram represents a mixture?

a)

I

b)

II

c)

III

d)

IV

4.

Mixtures are different than pure substances because mixtures-

a)

have lower boiling points

b)

can be separated physically

c)

are less dense than pure substances

d)

contain only one type of atom

5.

Which of the following is true of oxygen?

a)

Oxygen is an element because its most basic unit is a single type of atom

b)

Oxygen is a compound because its most basic unit is a single type of atom.

c)

Oxygen is a mixture because its most basic unit contains more than one particle.

d)

Oxygen is a compound because its most basic unit contains more than one type of particle.

6.

Beatriz wants to make a mixture out of her bowl of blueberries. Which of the following would turn her bowl of blueberries into a mixture?

a)

adding more blueberries to the bowl

b)

adding raspberries to the bowl

c)

cutting up the blueberries

d)

mashing the blueberries

7.

Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO2. Carbon dioxide gas is

a)

an element made of carbon and oxygen atoms.

b)

a solution made of carbon and oxygen atoms.

c)

a compound of carbon and oxygen atoms.

d)

a mixture of carbon and oxygen atoms.

8.
DIFFERENT kinds of atoms chemically combined to form a substance are
a)
Mixture
b)
Element
c)
Compound
d)
Substance
9.
You are eating a pizza. What type of mixture are you consuming?
a)
homogeneous
b)
heterogeneous
c)
pure substance
d)
The Periodic Table
10.
A mixture that appears to be evenly mixed throughout:
a)
an atom
b)
a compound
c)
a homogeneous mixture
d)
a heterogeneous mixture
11.
Salt is a(n)
a)
element
b)
compound
c)
mixture
12.
Italian Salad Dressing is a . . .
a)
heterogeneous mixture
b)
homogeneous mixture
c)
Pure Substance
d)
Compound
13.
Which of the following is an element?
a)
Sugar
b)
Salt
c)
Water
d)
Oxygen
14.
A combination of particles of one or more substance that are distributed uniformly throughout another substance is a/an
a)
Mixture 
b)
Substance
c)
Solution
15.
A pure substance that cannot be broken down into other substances by chemical or physical means. 
a)
compound          
b)
atom
c)
mixture 
d)
element
16.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
17.
If a spoonful of sugar is mixed in a glass of water, what is the water called? 
a)
solute
b)
solution
c)
solvent
d)
element 
18.
Sugar water is a 
a)
solution
b)
suspension
c)
colloid
19.
Milk is a 
a)
solution
b)
suspension
c)
colloid
20.
A mixture made of parts that separate upon standing is what type of mixture?
a)
suspension
b)
solution
c)
alloy
d)
colloid
21.
type of mixture that doesn't separate on its own but still contains undissolved particles
a)
solution
b)
colloid
c)
suspension
22.

What is a combination of 2 or more substances that keep their identities?

a)

physical property

b)

mixture

c)

physical change

d)

chemical change

23.

A handful of soil is an example of a _________________?

a)

mixture

b)

solution

c)

energy

d)

a science tool

24.
What is a substance that is dissolved in another substance? 
a)
solution
b)
solute
c)
solvent
d)
compound
25.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
26.
In the above picture, a powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?

a)
stir the powder in the liquid
b)
freeze the mixture
c)
add more powder to the liquid
d)
store the mixture in a dark place
27.
When Koolaid mix is light colored and tastes watery it is a _______ solution.
a)
saturated 
b)
diluted
28.
When a Koolaid mix in water is dark in color and very sweet it is a __________ solution.
a)
concentrated 
b)
Diluted
29.
To make a solute dissolve more quickly i n a solvent which would you do?
a)
Put it in cold water and stir it
b)
Put it in warm water and stir it
30.

Which of the following actions will NOT

increase the rate of dissolution

(dissolving)?

a)

Stirring the solution

b)

Decreasing the temperature

c)

Increasing the surface area of the

solute

d)

Increasing the temperature

31.
This type of mixture contains two or more substances that are visibly distinguishable. 
a)
homogeneous
b)
heterogeneous
c)
solution
d)
colloid
32.
Olive Oil
a)
Heterogeneous  mixture
b)
Homogeneous mixture
33.
Which is an example of a solution?
a)
Chex Mix
b)
Mixed fruit
c)
Juice
d)
milk and cereal
34.
When materials combine to form a mixture, they
a)
A. keep their original properties.
b)
B. react to form a new substance with new properties.
c)
C. combine in a specific ratio.
d)
D. always change their physical state.
35.
amount of solute that can dissolve in a given amount of solvent at a given temperature
a)
saturated solution
b)
solubility
c)
pure substance
d)
colloid
36.
Particles are spread throughout a fluid but are too large to stay mixed w/o being stirred or shaken.
a)
suspension
b)
colloid
c)
solution
37.
Particles are spread throughout a fluid but are too large to stay mixed w/o being stirred or shaken.
a)
suspension
b)
colloid
c)
solution
38.

Which of the following has the largest particles?

a)

Solution

b)

Suspension

c)

Colloid

39.
The most commonly used solvent in food is ___
a)
sodium chloride
b)
vinegar
c)
water 
d)
citric acid
40.

Which of the following would leave particles on filter paper?

a)

Solution

b)

Suspension

c)

Colloid

41.

Which of the following is always homogeneous?

a)

Solution

b)

Suspension

c)

Colloid

42.

True or False - A compound can not be a pure substance because it contains more than one type of element?

a)

True

b)

False

43.

If all the atoms in the substance have the same identity it is known as a(n)

a)

molecule

b)

compound

c)

pure substance

d)

element

44.

A substance in which the atoms of two or more different elements are combined in a fixed proportion.

a)

molecule

b)

compound

c)

element

d)

mixture

45.

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

a)

mixture

b)

pure substance

46.

A snow globe would be an example of a __________________.

a)

colloid

b)

solution

c)

suspension

47.

Which of these is an element?

a)

Salt (NaCl)

b)

Water (H20)

c)

Oxygen (O)

d)

Carbon Dioxide (CO2)

48.

Which of these is a compound?

a)

Aluminium (Al)

b)

Carbon Dioxide (CO2)

c)

Nitrogen (N)

d)

Sand

49.

Which substance is MOST soluble at 0 ºC?

a)

KCI

b)

NaNO3

c)

NaCl

d)

Ce2(SO4)3

50.

The beaker on the left would be a _______ (both have been recently stirred)

a)

Solution

b)

Suspension

c)

Colloid

d)

Impossible to tell

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