WorksheetsQUIZ Balancing Chemical Equations
Total questions: 16
Worksheet time: 45mins
What does the Law of Conservation of Mass state?
Matter cannot be created or destroyed in a chemical reaction.
Matter can only be destroyed in a chemical reaction.
Matter can only be created in a chemical reaction.
Matter can be created and destroyed in a chemical reaction.
Example: H2
What are the numbers that you CANNOT change in a chemical equation?
Coefficients
Products
Reactants
Subscripts
How many oxygen atoms are in this chemical formula?
6 oxygen atoms
2 oxygen atoms
3 oxygen atoms
4 oxygen atoms
How many oxygens are in the following?
3Pb(OH)4
1
3
4
12
Mg + __HCl ---> MgCl2 + H2
Is this equation balanced?
Yes, it has the same number of each element in both the reactants and the products.
Yes, but the hydrogens should not have been split in the products.
No, it doesn't follow the law of conservation.
No, the hydrogens should not have been split in the products.
Which equation demonstrates the law of conservation of mass?
Al + 2HCl → AlCl + HB4
Al + 2HCl → 2AlCl + H2
2Al + 3HCl → 2AlCl + 3H2
2Al + 6HCl → 2AlCl3 + 3H2
Which equation is more correct?
They are equally correct. They both follow the law of conservation.
"1" because it follows the law of conservation of mass and is simplified.
"2" because it is balanced better.
NaHCO3 --> Na2CO3 + H2O + CO2
Respectively, what coefficients would balance this equation?
1→1,1
2→2,3
1→1,3
3→3,2
What are the coefficients needed to balance this equation?
1,1→1,1
4,6→12,2
2,3→3,1
2,3→6,1
Choose the respective coefficients needed to balance this equation
1,1→1,1
2,4→3,1
2,3→1,3
4,6→2,6
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
1,15→7,17
4,45→28,34
2,23→14,17
None of these are correct
