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WorksheetsConservation of Mass and Endothermic/Exothermic Reactions
Total questions: 26
Worksheet time: 7hrs 30mins
Name
Class
Date
1.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
2.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these
3.
Is photosynthesis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
4.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the above
5.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
6.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
7.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
8.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
9.
When iron nails get rusty, heat is released. What process is this?
a)
Exothermic
b)
Endothermic
10.
Is the combustion of gasoline endothermic or exothermic?
a)
Endothermic
b)
Exothermic
11.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
bubbles of gas appear
d)
dissolving
12.
Evaporation is what kind of change?
a)
Endothermic
b)
Exothermic
13.
Number placed in front of a chemical formula
a)
product
b)
coefficient
c)
reactant
d)
subscript
14.
Number written below & to the right of a chemical symbol
a)
subscript
b)
reactant
c)
product
d)
coefficient
15.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
16.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
17.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
18.
What does the principle of conservation of mass mean?
a)
The total mass of the reactants is more than the products
b)
Matter is not created or destroyed
c)
The total mass of the reactants is less than the products
19.
Why does this picture demonstrate the Law of Conservation of Mass?
a)
the number of atoms of each element are the same on both sides
b)
they start out separate and end up combined
c)
the same elements are used
d)
it doesn't demonstrate the Law of Conservation of Mass
20.
A 500-gram block of solid cheese is melted in a pot. Which is most likely the mass of the cheese after it is melted?
a)
500 grams, because the cheese does not gain or lose mass just because it was melted
b)
499 grams, because some of the cheese evaporates as it melts
c)
502 grams, because the cheese absorbs heat as it melts
21.
If there are 4 H atoms on the reactant side, how many H atoms will be on the product side?
a)
2
b)
4
c)
6
d)
You need more information to answer this question
22.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Output
23.
What is the part of the chemical equation in green called?
Fe + S → FeS
a)
products
b)
reactants
c)
yield
d)
input
24.
Is this equation balanced or unbalanced?
H2 + O2 --> H2O
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
25.
Is this equation balanced or unbalanced?
2Fe2O3 + 3C --> 4Fe + 3 CO2
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
balanced
b)
unbalanced
26.
How many oxygen atoms are on each side of the equation?
2Fe2O3 + 3C --> 4Fe + 3 CO2
a)
6
b)
3
c)
2
d)
3 on the left side, 2 on the right side.
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