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Chemistry Review

Total questions: 25

Worksheet time: 18mins

Name
Class
Date
1.
Which of the following is described as the basic unit of matter?
a)
Element
b)
Atom
c)
Molecule
d)
Compound
2.
In the atom diagram shown, E is pointing to
a)
An electron
b)
a proton
c)
a neutron
d)
the nucleus
3.
B and C are found in the ______ of an atom.
a)
electron cloud
b)
Space
c)
Nucleus
d)
Outside
4.
What charge does an electron have?
a)
Negative
b)
Positive
c)
Neutral
d)
Contrated
5.

What 2 elements make up water?

a)

Hydrogen and Carbon

b)

Carbon and Oxygen

c)

Hydrogen and Oxygen

d)

Oxygen and Helium

6.

How many molecules are in this formula?

a)

1

b)

2

c)

3

d)

6

7.

An electron is located ...

a)

in the nucleus.

b)

outside the nucleus.

8.

What is the property of water is shown in the picture?

a)

specific heat

b)

universal solvent

c)

capillary action

d)

surface tension

9.

The center of an atom is called

a/an __________.

a)

atomic mass

b)

nucleus

c)

proton center

d)

energy shell

10.

Matter takes up space. What property of matter is this?

a)

mass

b)

volume

c)

density

d)

melting point

11.

What state of matter does a material have to be in for you to smell it?_

a)

solid

b)

liquid

c)

gas

d)

plasma

12.
Which of the following is a chemical change?
a)
Iron rusting 
b)
Glass breaking
c)
Clothing ripping
d)
Hair cut
13.
Which of the following is evidence of a chemical change?  
a)
Change in state
b)
No new substance is formed
c)
Bubbles forming
d)
Change in shape
14.
Which of the following is an example of a physical change, and why? 
a)
Fire burns in fireplace, because a new substance is formed. 
b)
Clothes are folded, because there is a color change. 
c)
A mirror is broken, because there is a change in shape/size.
d)
cookies are baked, because there is a change in temperature
15.

Identify the elements in this compound.

a)

Carbon, Helium, Oxygen

b)

Chromium, Hydrogen, Oxygen

c)

Calcium, Hydrogen, Oxygen

d)

Carbon, Hydrogen, Oxygen

16.

A group of elements that are shiny, conduct heat and electricity well is called

a)

Metals

b)

Non-metals

c)

Metalloids

17.

What is made up two or more elements that are chemically combined?

a)

Atom

b)

Element

c)

Compound

d)

Mixture

18.

Which is an example of an heterogenous mixture?

a)

soy sauce

b)

salad

c)

tea

d)

guacamole

19.
When a liquid becomes a gas, that process is called ___________________.  When a gas becomes a liquid it is called ____________________. 
a)
Melting; freezing
b)
Evaporation; condensation
c)
Evaporation; melting
d)
Condensation; evaporation
20.
Which of the following is NOT a compound? 
a)
O2
b)
MgO
c)
CH4
d)
H2O
21.
An example of an endothermic reaction is:
a)
ice melting because it is cold 
b)
baking soda and vinegar reacting because the temperature decreases
c)
elephant toothpaste because the substances react and the temperature increases
22.
During an exothermic reaction
a)
energy is released by heat or light
b)
energy is absored, decreasing temperature
c)
molecules do not change 
23.
Tina argues that water boiling is sign of a chemical reaction because the temperature increases. What would be the best response?
a)
You're correct, Tina!
b)
Water boiling is still H20 since it can exist as a gas, liquid, or solid. No new substance was formed.
c)
We formed a new substance by changing liquid into a gas.
d)
You're wrong. 
24.
A pure substance that can not be broken down further.
a)
Atom
b)
Element
c)
Compound
25.
Two or more substances mingled together, they keep their identity.
a)
Mixture
b)
Compound
c)
Element

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