WorksheetsChemistry Test Review
Total questions: 36
Worksheet time: 1hrs 29mins
Name
Class
Date
1.
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
2.
If reaction starts with 20g of reactants it should produce
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
3.
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
4.
________ are the starting substances in a chemical equation.
a)
Reactants
b)
Producer
c)
Reaction
d)
Products
5.
What do we call the chemicals that result from a chemical reaction?
a)
reactants
b)
products
c)
subscripts
d)
coefficients
6.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
7.
The number to the lower side of an element is a
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
8.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same number of atoms
c)
Same subscripts
d)
Same coefficients
9.
The coefficient in 3H2O is
a)
6
b)
2
c)
3
d)
5
10.
Which are the reactants in the following reaction?
2Mg + O2 ---> 2MgO
2Mg + O2 ---> 2MgO
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
11.
Which chemical equation supports the law of conservation of mass?
a)
Equation (a)
b)
Equation (b)
c)
Equation (c)
d)
Equation (d)
12.
How many Hydrogen atoms are in 4H2O?
a)
6
b)
8
c)
2
d)
4
13.
How many Oxygen atoms are in H2O?
a)
1
b)
2
c)
0
d)
4
14.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
15.
How many atoms are there TOTAL in H2SO4 ?
a)
6
b)
5
c)
7
d)
3
16.
How many Nitrogen atoms are in (NH₄)₂CrO₄?
a)
1
b)
2
c)
8
d)
16
17.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
Mg + __HCl ---> MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
18.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
19.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2,6,3,2
b)
it's already balanced
c)
4,12,3,4
d)
2,1,4,5
20.
Blue Color: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
21.
Density: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
22.
Flammability (burns): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
23.
Solubility (dissolves): Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
24.
Reacts with Acid: Chemical or Physical Property
a)
Chemical Property
b)
Physical Property
25.
Wood that is burning in a brush pile has heat, and produces ashes.
a)
Physical
b)
Chemical
26.
Is freezing juice a physical or chemical change?
a)
Physical Change
b)
Chemical Change
27.
Is this an example of a physical or chemical change?
a)
Physical because it is a mixture.
b)
Chemical because the parts have changed shape.
28.
Why is this a physical change?
a)
The shape of the clay has been changed.
b)
The clay can be put back into a ball shape instead of a birthday cake.
c)
The clays has not changed chemically.
d)
All are true
29.
In which of these do particles move slowest?
a)
matter
b)
gas
c)
liquid
d)
solid
30.
Which is NOT a physical change?
a)
Cutting a pizza into equal slices.
b)
Ice cubes melting back into liquid. water
c)
Baking cupcakes.
d)
A chocolate bar melting.
31.
Which of the following is a physical change?
a)
Dissolving
b)
Rapid release of heat
c)
Fizzing (release of gas)
d)
Rusting
32.
Evidence of a physical change.
a)
New substance
b)
Shape Change
c)
Light produced
d)
Gas released.
33.
Which of the following examples shows that a chemical reaction has occurred?
a)
A rock breaks into smaller pieces when it is struck with a hammer.
b)
Rust forms on a hammer that has been left outside to long.
c)
A cup of water turns pink when a few drops of red food coloring are added.
d)
A solid is formed when heat is removed from a sample of water.
34.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
a)
could show that a gas is forming
b)
always rise to the top of a liquid.
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
35.
Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?
a)
The mass of the solution remains the same.
b)
Phase changes are observed.
c)
The color of the solution remains clear.
d)
The temperature of the solution increases.
36.
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
a)
The level of the substance in the beaker is higher after the other liquid is added.
b)
A yellow solid forms and then settles to the bottom of the beaker.
c)
Small white crystals are left behind in the flask that held the first liquid.
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