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WorksheetsChemical Reactions Honors
Total questions: 21
Worksheet time: 22mins
Name
Class
Date
1.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
2.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
3.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
4.
A molecule is smaller than an atom.
a)
True
b)
False
5.
Identify the Reactants in this equation.
a)
A
b)
B
6.
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
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.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
9.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
10.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
11.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
12.
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
13.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
14.
Which one is a compound?
a)
Co
b)
Br
c)
Fe
d)
CO
15.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
16.
Which would indicate a chemical equation is balanced?
a)
If the number of atoms in the reactants is the same as the number of atoms in the products
b)
If the atoms have ionic OR covalent bonds
c)
If the atoms have full valence shells
d)
If the total energy has remained the same
17.
In the equation, 2Mg + O2 ---> 2MgO,
MgO is produced as ?
a)
black powder
b)
white fumes
c)
white powder
d)
a gas
18.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
19.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
a)
true
b)
false
20.
The left side of the equation below is called
a)
Products
b)
Reactants
21.
The right side of the equation below is called the
a)
products
b)
reactants
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