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WorksheetsChemistry Equations
Total questions: 25
Worksheet time: 25mins
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
4Fe + 3O2 -> 2Fe2O3
2 Fe + 3O2 -> Fe2O6
4 Fe + O6 -> 2Fe2O3
None of the options are correctly balanced.
Which of the following reactions is balanced?
2CH4 + O2 -> CO2 + H2O
CH4 + 2O2 -> CO2 + H2O
CH4 + 2O2 -> CO2 + 2H2O
None of the chemical equations are balanced.
How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl2 + H2
1
2
3
4
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
2,1,2,1
1,2,2,1
1,2,1,2
2,2,2,2
How many total atoms are in this formula?
1
2
6
7
This number is used to represent the number of each atom being represented. What is the name of this number?
An Exponent
The Coefficient
A Molecule
The Subscript
This appears on the left side of a chemical formula, and represents how many molecules there are.
An Atom
The Subscript
A Molecule
The Coefficient
This appears on the left side of a chemical formula, and represents how many molecules there are.
A Molecule
The Coefficient
You should do what with the coefficient and the subscript of an atom Ex: 2H2O (a)
Add
Subtract
Multiply
Divide
Look at the image, and calculate which formula contains the most atoms of Oxygen
1
2
3
4
Match the following
Subscript
# of atoms of the element it represents
Chemical Symbol
Show way to write the name of an element
Chemical Formula
Shows elements present in a substance
Coefficient
The # of molecules in chemical equation
Chemical Equation
Shows how elements form new substances.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
1,2,1,1
2,1,2,1
1,2,1,2
0,2,0,2
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
2, 6, 3, 2
it is already balanced
4, 12, 3, 4
2, 1, 4, 5
The substances listed on the right side of a chemical equation are the
Yields
Reactants
Products
Precipitates
The substances listed on the left side of a chemical equation are the
Products
Coefficients
Precipitates
Reactants
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
1
2
3
0
How many Sodium (Na) are in 6NaCl?
1
12
6
How many Hydrogen are in 4H2O?
6
8
2
4
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed.
The total mass of the reactants is greater than the total mass of the products.
The total mass of the reactants is less than the total mass of the products.
Matter is not changed.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
1
2
3
0
Which of the following chemical equations is balanced?
@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 4 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 5 ext{O}_2 ightarrow 4 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
@@ ext{C}_3 ext{H}_8 + 6 ext{O}_2 ightarrow 3 ext{CO}_2 + 4 ext{H}_2 ext{O}@@
What is the coefficient of O2 when balancing the equation: @@ ext{C}_2 ext{H}_4 + ext{O}_2 ightarrow ext{CO}_2 + ext{H}_2 ext{O}@@?
2
3
4
5
In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O} ,whatistheroleof ext{O}_2@@?
Reactant
Product
Catalyst
Inhibitor
Which of the following represents a decomposition reaction?
@@ ext{2H}_2 ext{O} ightarrow 2 ext{H}_2 + ext{O}_2@@
@@ ext{2Na} + ext{Cl}_2 ightarrow 2 ext{NaCl}@@
@@ ext{CH}_4 + 2 ext{O}_2 ightarrow ext{CO}_2 + 2 ext{H}_2 ext{O}@@
@@ ext{N}_2 + 3 ext{H}_2 ightarrow 2 ext{NH}_3@@
Which of the following is a redox reaction?
@@ ext{Zn} + ext{CuSO}_4 ightarrow ext{ZnSO}_4 + ext{Cu}@@
@@ ext{HCl} + ext{NaOH} ightarrow ext{NaCl} + ext{H}_2 ext{O}@@
@@ ext{AgNO}_3 + ext{NaCl} ightarrow ext{AgCl} + ext{NaNO}_3@@
@@ ext{BaCl}_2 + ext{H}_2 ext{SO}_4 ightarrow ext{BaSO}_4 + 2 ext{HCl}@@
