WorksheetsChemical Reactions
Total questions: 23
Worksheet time: 14mins
Name
Class
Date
1.
Density is...
a)
the amount of mass in an object
b)
the amount of space an object takes up
c)
the amount of mass in a given space
d)
the weight of an object
2.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
3.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
4.
___________________ are the elements or compounds that are formed or produced in a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
5.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
6.
_________________ are the elements and compounds that react, or start, in a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
7.
Which of the following could indicate a chemical change?
a)
All of the answers could indicate Chemical Change
b)
a color change has occurred
c)
bubbles appear
d)
identifying one or more new chemical products
8.
Which is NOT an example of chemical change?
a)
production of gas.
b)
change in color.
c)
change in size.
d)
transfer of energy.
9.
A copper penny turning greenish after a few years is an example of...
a)
Chemical Change
b)
Physical Change
10.
Which of the following is a PHYSICAL change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
11.
What is the law of conservation of mass?
a)
The part of the universe being studied
b)
The rest of the universe that interacts with the system
c)
Within a closed system, mass does not change
d)
A system that freely exchanges matter and energy
12.
The total amount of matter (atoms) before and after a chemical reaction (change), remains the same.
a)
True
b)
False
13.
Evidence of a chemical reaction include:
a)
Phase change
b)
No new substance
c)
Bubbles forming
d)
Shape change
14.
Which type of reaction will feel warm?
a)
endothermic
b)
exothermic
c)
endergonic
d)
none of these
15.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
16.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
17.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
18.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
19.
3. If the atoms of an object are moving fast, the temperature would be...
a)
High
b)
Low
c)
Unknown
20.
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)
21.
The energy needed to start a chemical reaction is the _____________________.
a)
Activation Energy
b)
Products
c)
Reactants
d)
Enzymes
22.
_________________ are the elements and compounds that enter into a chemical reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
23.
The Kinetic theory states that the higher the temperature, the faster the
a)
particles move in a substance
b)
bonds between atoms break down
c)
molecules of gas rush together
d)
lighter particles within a substance clump together
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