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WorksheetsChemical Equations
Total questions: 23
Worksheet time: 12mins
Name
Class
Date
1.
What is the coefficient of the oxygen molecule in the elephant toothpaste equation?
2 H2O2 -> 2 H2O + O2
2 H2O2 -> 2 H2O + O2
a)
0
b)
1
c)
2
d)
4
2.
What do you call the substances on the left side of a chemical equation?
a)
yield
b)
products
c)
reactants
d)
compounds
3.
Chose the correct labels for the parts of a chemical equation.
a)
reactants yield products
b)
reactants make compounds
c)
products equal reactants
d)
products yield reactants
4.
Which is the correct atom count for the reactant side of the chemical equation?
CH4 + 2 O2 -> CO2 + 2 H2O
CH4 + 2 O2 -> CO2 + 2 H2O
a)
C=4
H=4
O=4
H=4
O=4
b)
C=1
H=4
O=2
H=4
O=2
c)
C=1
H=4
O=2
H=4
O=2
d)
C=1
H=4
O=4
H=4
O=4
5.
Based on the diagram, what is the formula for hydrogen peroxide?
a)
H2O12
b)
H2O2
c)
H4O10
d)
there is no way to determine the formula
6.
Which contains the greatest number of elements?
a)
5CH4
b)
Fe2O3
c)
C6H12O6
d)
C8H10N4O2
7.
Which contains the greatest number of atoms?
a)
5CH4
b)
Fe2O3
c)
C6H12O6
d)
C8H10N4O2
8.
How many compounds are shown in the equation for cellular respiration?
a)
1
b)
2
c)
3
d)
4
9.
How are chemical bonds formed?
a)
by sharing, giving, or taking electrons from another atom
b)
through radioactive decay
c)
by losing or gaining neutrons in the nucleus
d)
by exchanging protons with another atom
10.
What is true of this chemical equation?
a)
it is balanced
b)
it is unbalanced
c)
it produces an organic substance
11.
To make elephant toothpaste, a catalyst (KI) is added to hydrogen peroxide (H2O2). The reaction creates a large amount of foam and liquid in the bottom of the bottle. What is the formula for the liquid produced?
2 H2O2 -> 2 H2O + O2
2 H2O2 -> 2 H2O + O2
a)
H20
b)
KI
c)
H2O2
d)
O2
12.
To make elephant toothpaste, a catalyst (KI) is added to hydrogen peroxide (H2O2). The reaction creates a large amount of foam and liquid in the bottom of the bottle. Which of the following is a reactant in the formula?
2 H2O2 -> 2 H2O + O2
2 H2O2 -> 2 H2O + O2
a)
H20
b)
KI
c)
H2O2
d)
O2
13.
Which is NOT an indicator of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
14.
Which example shows evidence of a chemical change?
a)
a glass bowl shatters when it hits the floor
b)
lemonade powder is mixed in water
c)
an apple is cut for a snack
d)
milk sours in the refrigerator
15.
What is the ratio of iron atoms to oxygen atoms in the compound for rust (Fe2O3)?
a)
2:3
b)
3:2
c)
1:1
d)
not able to be determined
16.
A subscript tells you...
a)
the # of atoms in the entire equation
b)
the # of elements in the equation
c)
the # atoms of the element it sits behind
d)
the # of compounds present
17.
A coefficient tells you...
a)
the # of atoms in the entire equation
b)
the # of elements in the equation
c)
the # atoms of the element it sits behind
d)
the # of molecules of that substance
18.
Which is an INORGANIC compound?
a)
CH4
b)
C6H12O6
c)
C13H18O2
d)
CO2
19.
An organic compound contains -
a)
C, S, H, O, P, N
b)
C, H
c)
C, O
d)
H
20.
Physical changes in digestion:
*chewing
*enzymes
*churning
Chemical changes in digestion:
*saliva
*stomach acid
*peristalsis
*chewing
*enzymes
*churning
Chemical changes in digestion:
*saliva
*stomach acid
*peristalsis
a)
True
b)
False
21.
The Law of Conservation of Mass proves that -
a)
the number of atoms in a chemical reaction does not change
b)
there are more atoms on the reactant side than the product side
c)
there are more atoms on the product side than the reactant side
d)
no new matter can be made
22.
Which of the following proves the Law of Conservation of Mass?
a)
thermal energy is produced
b)
a balanced chemical equation
c)
chemoluminescence
d)
formation of a precipitate
23.
Which is true about the chemical equation for photosynthesis?
a)
carbon dioxide is produced
b)
oxygen gas is a reactant
c)
there are more atoms on the product side than the reactant side
d)
proves the Law of Conservation of Mass
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