WorksheetsReactions review
Total questions: 18
Worksheet time: 2hrs 59mins
How many atoms are in the compound MgF2?
2
3
4
5
What is the balanced coefficient ratio for the reaction shown below?
___Fe + ___H2O --> ____Fe3O4 + ___H2
3:2:2:1
3:4:1:4
2:3:2:2
1:1:1:1
Which equations below is correctly balanced? Pick 2
4Na + O2 --> 2Na2O
Sn + 2KOH --> K2SnO2 + 2H2
KOH + HCl --> H2O + KCl
H2 + O2 --> H2O
Which of the following is an example of a chemical reaction?
a banana ripening
rain turning into ice
a coke sweating on a hot day
getting a hair cut
Which of the following types of reactions takes 2 substances and combines them to create 1 new substance?
synthesis
single replacement
decomposition
double replacement
In a compound chemical energy is contained in the
nuclei of atoms
unbonded electrons
bonds
movement of electrons
What type of reaction would follow the general equation: AB + C --> AC + B
synthesis
single replacement
decomposition
double replacement
Which of the following are classified as a chemical change? Select the best two choices.
melting gold for a bracelt
rust forming on the metal bike outside
burning a log to heat your home
adding cream to coffee
When wood burns, a small amount of ashes are made. Why is the mass of the wood before the fire not equal to the mass of the ashes after the reaction?
The mass of the wood has been destroyed.
The mass of the wood and ashes equals the mass of the oxygen and smoke that was lost during burning.
The wood has holes in it; and the mass of the wood will equal the mass of the ashes after the burning.
The mass of wood and oxygen that allowed it to burn equals the mass of the ashes and the gas given off.
What coefficients would balance the equation?
___Fe + ___Cl2 --> ___FeCl3
3 2 2
1 1 1
4 2 2
2 3 2
Which of the following is a balanced chemical equation for the synthesis of NaBr from Na and Br2?
A. Na + Br2 -->NaBr
B. 2Na + Br2 --> NaBr
C. Na + Br2 --> 2NaBr
D. 2Na + Br2 --> 2NaBr
Na + Br2 --> NaBr
2Na + Br2 --> NaBr
Na + Br2 --> 2NaBr
2Na + Br2 --> 2NaBr
Which type of reaction is represented by the following chemical equation?
3CuCl2 + 2Al --> 2AlCl3 + 3Cu
synthesis
single replacement
decomposition
double replacement
How many reactants and products are in a decomposition reaction?
2 reactants 1 product
1 reactants 1 product
1 reactants 2 product
2 reactants 2 product
Which of the following is NOT a balanced chemical reaction?
A. CH4 + 2O2 à CO2 + 2H2O
B. MgO + CaS à MgS + CaO
C. Zn + CuCl2 à ZnCl2 + Cu
D. O2 + H à H2O
CH4 + 2O2 --> CO2 + 2H2O
MgO + CaS --> MgS + CaO
Zn + CuCl2 --> ZnCl2 + Cu
O2 + H --> H2O
In a chemical reaction, mass is conserved. This means that
The mass of the reactants stays the same during a chemical reaction
The mass of the products stays the same during a chemical reaction
The type and number of atoms in the reactants equals the type and number of
atoms in the products
The mass of the products is always twice the mass of the reactants
If the reactants on the left side of a chemical equation are C3H8 + 5O2, the products in a
balanced equation could be
a) 4CO2 + 3H2O
b) 3 CO2 + 4 H2O
c) 2 CO2 + 3 H2O
d) 3 CO + 4 H2O
4CO2 + 3H2O
3CO2 + 4H2O
2CO2 + 3H2O
3CO + 4H2O
What is the general form for a double-replacement reaction?
a. AX + BY --> AY + BX
b. A + B à AB
c. AB à A + B
d. A + BX à AX + B
AX + BY --> AY + BX
A + B --> AB
AB --> A + B
A + BX --> AX + B
To balance a chemical equation, it may be necessary to adjust the
coeficcients
subscripts
formulas of products
number of products
