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Chemical Reactions Unit

Total questions: 35

Worksheet time: 52mins

Name
Class
Date
1.
Which of the following is a chemical change rather than a physical change 
a)
boiling water at 100 C
b)
chopping up a piece of wood. 
c)
cooking a cake 
d)
ice carbon dioxide sublimating to gas 
2.
The process going from a gas to a liquid is called ...
a)
evaporation 
b)
melting 
c)
condensation 
d)
sublimation 
3.
A Precipitate forms 
a)
when a gas is bubble through a liquid 
b)
a lighter taper causes a gas to burn 
c)
in a liquid or gas  after a reaction and causes cloudiness (caused by a solid forming) 
4.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
5.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
6.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
7.

According to the law of conservation of mass, matter cannot be created or (a)  

8.

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

a)

True

b)

False

9.

A chemical change is different than a physical change because in a chemical change

a)

chemicals are used

b)

molecules do not physically touch

c)

a new substance is formed and in a physical no new substance is formed

d)

the change can be seen but in a physical change it cannot

10.

Which of the following 2 are chemical reactions?

a)

sugar dissolving in water

b)

water turning into steam

c)

burning wood

d)

mixing baking soda and vinegar

e)

tearing paper

11.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

12.
A candle wick burning is an example of a _________________________
a)
physical reaction
b)
condensation
c)
neutrons
d)
chemical reaction
13.
_______________ is an example of both a color change and new substance produced from a chemical change with oxygen and metal.
a)
shredded paper
b)
rust (iron oxide)
c)
wood chips
d)
melted wax
14.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
15.
Which of these is NOT a sign that a chemical change has occurred? 
a)
Change in shape.
b)
An unexpected color change
c)
A temperature change
d)
The formation of a precipitate
16.

You know that a chemical reaction has occurred if

a)

there is a precipitate (new solid)

b)

there is a color change.

c)

there is a temperature change.

d)

All of these answers are evidence.

17.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
18.

In chemical reactions, what does the Law of Conservation of Matter mean?

a)

Matter is not created or destroyed.

b)

The total mass of the reactants is greater than the total mass of the products.

c)

The total mass of the reactants is less than the total mass of the products.

d)

Matter is not changed.

19.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
20.

The smallest particle of an element; made of electrons, protons, and neutrons

a)

Atoms

b)

Elements

c)

Molecules

d)

Products

21.

The simplest unit of a chemical compound that can exist; formed when two or more atoms join together chemically

a)

Atom

b)

Compound

c)

Molecule

22.

A substance produced during a chemical reaction

a)

Product

b)

Reactant

c)

Properties

23.

A chemical reaction or process that absorbs heat from the surroundings

a)

Endothermic

b)

Exothermic

24.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

25.

Which subatomic particle has a negative charge?

a)

proton

b)

neutron

c)

electron

26.

Which subatomic particle has a positive charge?

a)

proton

b)

neutron

c)

electron

27.

Which subatomic particle has a neutral or no charge?

a)

proton

b)

neutron

c)

electron

28.
What is the number of protons that the element in this image contain?
a)
14
b)
7
c)
15
d)
18
29.
all matter is made of what 
a)
energy 
b)
atoms 
c)
electrons 
d)
compounds 
30.
What is at the center of every atom?
a)
an electron
b)
a compound
c)
a molecule
d)
a nucleus
31.
In an atom, what is the number of protons equal to?
a)
the number of electrons
b)
the number of neutrons
c)
the number of molecules
d)
the number of nuclei
32.
True or False? Neutrons have a negative charge
a)
True
b)
False
33.
Where are electrons of an atom found?
a)
Nucleus
b)
Electron Cloud
c)
Some are in the nucleus and some in the electron cloud.
d)
They are moving everywhere.
34.

What is an atom?

a)

The smallest unit of matter

b)

The smallest unit of measurement

c)

Your next door neighbor

35.

anything that has mass and takes up space

a)

matter

b)

atom

c)

element

d)

nucleus

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