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Worksheets9.1 Review
Total questions: 27
Worksheet time: 26mins
Name
Class
Date
1.
Mg + ___ HCl → MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
2.
Balance this equation-
__P4 + __O2 --> __P2O3
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
3.
Endothermic reactions...
a)
release energy
b)
explode
c)
take in energy
d)
have higher energy in their reactants than the products
4.
Exothermic reactions
a)
have higher energy in their products than their reactants
b)
release energy
c)
get cold
d)
are synthesis reactions
5.
What is the law of conservation of mass?
a)
The amount of matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants equals the mass of the products
d)
The mass of the products is different than the mass of the reactants.
6.
How many oxygen atoms are in this chemical formula?
a)
6 oxygen atoms
b)
2 oxygen atoms
c)
3 oxygen atoms
d)
4 oxygen atoms
7.
How many nitrogen atoms does NH3 have?
a)
1
b)
2
c)
3
d)
4
8.
The number in front of a compound or element is a
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
9.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
10.
Does this follow the law of conservation of mass:
Yes No
Na + F --> NaF
a)
Yes
b)
No
11.
Does this follow the law of conservation of mass:
Yes No
O3 ---> O + O2
a)
Yes
b)
No
12.
Does this follow the law of conservation of mass:
Yes No
a)
Yes
b)
No
13.
Does this follow the law of conservation of mass:
Yes No
a)
Yes
b)
No
14.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
15.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
16.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
17.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
18.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
19.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
20.
What is law of conservation of mass ?
a)
Mass of reactants = mass of products
b)
mass of reactants > mass of the products
c)
mass of the reactants < mass of the products
d)
mass of reactants > 2 mass of the reactants
21.
Which of the following is NOT evidence that that a chemical reaction has occurred?
a)
produces light/heat
b)
production of a gas
c)
formation of a precipitate
d)
melting
22.
Which physical state indicates that a substance has been dissolved in water?
a)
(aq)
b)
(g)
c)
(l)
d)
(s)
23.
What does the ARROW mean in a chemical reaction?
a)
go
b)
equals
c)
yields
d)
stop
24.
What is a PRECIPITATE?
a)
When it rains.
b)
When a solid forms after 2 liquids mix and react.
c)
When a solid forms after steam is produced.
d)
When a solid forms after a liquid freezes.
25.
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.
26.
Evidence of a chemical reactions is anything that shows -
a)
a new substance has formed
b)
a solid dissolved in a liquid
c)
interaction between 2 gases
d)
a change in the state of matter
27.
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
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