WorksheetsUnit 3 Practice and Review Part 1
Total questions: 10
Worksheet time: 7mins
Look at the following chemical equation.
8Ag2S → 10Ag + S8
What is true about this chemical equation?
It is balanced because the products contain the
same number of sulfur (S) atoms as the reactants.
It is unbalanced because the products contain
fewer silver (Ag) atoms than the reactants.
It is balanced because the mass of the reactants is
equal to the mass of the products.
It is unbalanced because the number of reactants is
less than the number of products.
The equation shows the reaction between ammonia (NH3) and oxygen (O2).
__NH3 + __O2 → __NO + __H2O
In order to follow the law of conservation of mass, this
equation must have which set of coefficients, in order from
left to right?
4, 5, 4, 6
5, 4, 5, 4
5, 4, 4, 5
4, 6, 4, 5
An equation is shown.
__Ag2O → __Ag +__O2
In order to follow the law of conservation of matter, this
equation must have which set of coefficients, in order from
left to right?
2, 2, 2
1, 2, 1
3, 2, 3
2, 4, 1
__Fe + __Cl2 → __FeCl3
In order to follow the law of conservation of mass, this
equation must have which set of coefficients, in order from
left to right?
3, 1, 2
2, 1, 3
2, 3, 2
1, 3, 1
4P + 5O2 → P2O5
What coefficient needs to be placed in front of the products
to make sure the law of conservation of matter is followed?
1
2
3
4
H2 + O2 → H2O
What coefficients need to be placed in front of the reactants
and the product to make sure that the law of conservation
of matter is upheld?
1,2,1
1,2,3
2,1,2
2,3,2
NaBr + Cl2 → 2NaCl + Br2
Is this a balanced chemical equation?
No, because the mass of the reactants is less than
the mass of the products.
No, because the reactants contain fewer molecules
than the products.
Yes, because the reactants contain the same
number of chlorine (Cl) atoms as the products.
Yes, because the mass of the reactants is equal to
the mass of the products.
Zn + 2HCl → ZnCl2 + H2
Is this chemical equation balanced?
Yes, because the mass of the reactants is equal to
the mass of the products.
Yes, because the number of reactants is equal to
the number of products.
No, because the mass of the reactants is greater
than the mass of the products.
No, because the reactants contain fewer chlorine
(Cl) atoms than the products.
Chemical equations must be balanced because
the mass of the reactants is always greater than the
mass of the products.
the mass of the products is always greater than the
mass of the reactants.
mass can neither be created nor destroyed.
mass is determined by a chemical reaction.
Which of the following is correct about reactions?
During nuclear reactions, atoms are rearranged
and all the atoms present in the reactants are
present in the products.
During chemical reactions, atoms are rearranged
and all the atoms present in the reactants are
present in the products.
During chemical reactions, alpha, beta, or gamma
radiation is emitted from the nuclei of the atoms
taking part in the reaction.
During chemical reactions, the amount of energy
given off is always more than the energy given off in
nuclear reactions.
