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WorksheetsMatter Quiz
Total questions: 16
Worksheet time: 16mins
Name
Class
Date
1.
What is the definition of chemical reaction?
a)
The input which reacts chemically to create product
b)
a system where none of the reactants or products are allowed to escape
c)
occurs when the atoms and molecules of two or more substances rearrange to form new substances
d)
the output, or result of a chemical reaction
2.
What is a closed system?
a)
a system where none of the reactants or products are allowed to escape
b)
compounds made of thousands of repeating smaller molecules
c)
the output, or result of a chemical reaction
d)
occurs when the atoms and molecules of two or more substances rearrange to form new substances
3.
What is a closed system?
a)
a system where none of the reactants or products are allowed to escape
b)
compounds made of thousands of repeating smaller molecules
c)
the output, or result of a chemical reaction
d)
occurs when the atoms and molecules of two or more substances rearrange to form new substances
4.
What is a product in a chemical reaction?
a)
the output, or result of a chemical reaction
b)
occurs when the atoms and molecules of two or more substances rearrange to form new substances
c)
a small molecule that makes up one part of a polymer
d)
The input which reacts chemically to create product
5.
Fill in the blank:
The law of conservation of mass states that matter cannot be created nor __________________.
The law of conservation of mass states that matter cannot be created nor __________________.
a)
destroyed
b)
rearranged
c)
transferred
d)
changed
6.
Fill in the blank:
It is best to observe the law of conservation of mass in a _____________________ because it will ensure that the mass is the same in the beginning and end of a chemical reaction.
It is best to observe the law of conservation of mass in a _____________________ because it will ensure that the mass is the same in the beginning and end of a chemical reaction.
a)
closed
b)
open
c)
balanced
d)
rearranged
7.
In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?
a)
25g
b)
You can't tell with the given information.
c)
30g
d)
15g
8.
In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?
a)
Yes
b)
No
c)
You can't tell with the given infomation
9.
There are two reactants in a chemical equation, and one product. The mass of the product is 30g. The mass of the first reactant is 17g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?
a)
47g
b)
13g
c)
23g
d)
You cant tell with the given information
10.
Students react baking soda & vinegar.
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
Which of the following would provide the evidence that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction?
a)
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
b)
Bubbles were produced during the reaction, which meant that a gas was being produced.
c)
The plastic bag did not change in any way, indicating that it was not involved in the reaction.
d)
The mass of the baking soda was exactly equal to the mass of the vinegar used to create the chemical reaction.
11.
Which of the following is true of the law of conservation of mass?
a)
The same number and type of each atom will always be present before and after a chemical reaction takes place.
b)
Some of the atoms present before the reaction will always be lost during a chemical reaction.
c)
Some of the atoms will always be changed into a different type of atom by a chemical reaction.
d)
During a chemical reaction, atoms will always be combined into much larger molecules.
12.
Which of the following is the best description of the results of a chemical reaction?
a)
The substance seems to disappear after dissolving in water.
b)
The substance changes from liquid to solid at a low temperature.
c)
The reaction can be reversed to get back the original substance.
d)
A new substance with different properties is formed.
13.
Which of the following is a chemical change?
a)
Baking soda and vinegar producing gas bubbles
b)
A chocolate bar melting
c)
Powdered lemonade dissolving in water
d)
Frosting a cake
14.
Which of the following is not evidence of a chemical reaction?
a)
gas produced
b)
precipitate formation
c)
color change
d)
mass change
15.
The substances listed to the left of the arrow in a chemical reaction are called the _______________.
a)
products
b)
reactants
c)
substances
d)
materials
16.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
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