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WorksheetsChemical Reactions Post Test Practice
Total questions: 21
Worksheet time: 11mins
Name
Class
Date
1.
Matter can be classified by characteristics. In science, what do we call these characteristics?
a)
acidic and basic properties
b)
physical and chemical properties
c)
dependent and independent properties
2.
Which characteristics are chemical characteristics?
a)
flammability
b)
reactivity
c)
combustibility
d)
ability to rust
e)
melting point
3.
Which characteristics are physical characteristics?
a)
melting point
b)
solubility
c)
odor
d)
boiling point
e)
flammability
4.
Matter can go through changes. What are these changes called?
a)
positive and negative changes
b)
acidic and basic changes
c)
physical and chemical changes
5.
What is the difference between a physical and chemical change?
a)
Physical changes create new substances. Chemical changes only change the form of matter.
b)
Chemical changes create new substances. Physical changes only change the form of matter.
6.
What happens to the atoms of matter during a chemical change?
a)
The bonds between the atoms break and new bonds are formed.
b)
The atoms are destroyed and new atoms spontaneous appear.
7.
Which changes are physical changes?
a)
Cutting paper
b)
Crushing a Can
c)
Painting a Fence
d)
Dissolving Sugar
e)
Making a paper airplane
8.
Which changes are chemical changes?
a)
Toasting Bread
b)
A Rotting Banana
c)
Burning Wood
d)
Fireworks Display
e)
Rusting
9.
Two 6th Grade students mixed two substances together in a container covered with a balloon. After the mixing the balloon inflated. What sign is present that chemical reaction has happened?
a)
A precipitate formed.
b)
The color changed.
c)
A gas was produced.
10.
A student accidently spilled vinegar into a glass of milk. Soon a strange solid appeared. What sign is present that a chemical reaction has happened?
a)
A precipitate formed.
b)
The color changed.
c)
The temperature changed.
11.
Over time a banana on the counter turned brown. What sign is present that a chemical reaction happened?
a)
A precipitate formed.
b)
The color changed.
c)
A gas was produced.
12.
Logs were burned in a fireplace. What sign is present that a chemical reaction happened?
a)
A precipitate formed.
b)
The total mass increased.
c)
Heat was given off.
13.
What is the abbreviated way to show a chemical reaction?
a)
A chemical symbol
b)
A chemical equation
c)
A chemical abbreviation
14.
What are the two major parts of every chemical equation?
a)
coefficients and subscripts
b)
ratios and proportions
c)
reactants and products
15.
Which of the following is a reactant in the equation?
a)
Na
b)
NaCl
c)
2
d)
-->
16.
Which of the following is a product in the equation?
a)
Na
b)
NaCl
c)
2
d)
-->
17.
In a chemical reaction there are 2 hydrogen atoms in the reactants. How many hydrogen atoms will be in the products?
a)
1
b)
2
c)
3
d)
4
18.
A 6th grade student lit the match, quickly put it in the jar, and sealed the lid. Most of the paper burned. He saw smoke in the jar and black ashes left from the paper. Which sentence best describes the total mass of the jar, lid, paper, and match before burning compared with the total mass after burning?
a)
The total mass after burning is greater.
b)
The total mass after burning is less.
c)
The total mass before and after burning is the same.
19.
When the candle was lit, a pool of liquid wax formed in the area around the wick, and then spilled over the side and solidified. Does this observation refer to a physical change or a chemical change? Explain.
a)
Physical change, melting
b)
Chemical change, melting
20.
Is the reaction that occurs in the diagram endothermic or exothermic? Explain.
a)
Exothermic
b)
Endothermic
21.
If the products formed from the burning candle are mostly carbon (C), carbon dioxide (CO2), and water (H2O), what elements were in the reactants? How do you know?
a)
Carbon, Oxygen, and Hydrogen
b)
Carbon and Oxygen
c)
Only Hydrogen
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