WorksheetsChemical Reaction And Equation 1
Total questions: 10
Worksheet time: 4mins
Name
Class
Date
1.
Magnesium ribbon is rubbed before burning because it has a coating of
a)
basic magnesium carbonate
b)
basic magnesium oxide
c)
basic magnesium sulphide
d)
basic magnesium chloride
2.
Which of the following is a chemical reaction?
a)
Water freezes.
b)
Sugar dissolves in water.
c)
Salt and pepper are mixed in a dish.
d)
Iron rusts.
3.
When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:
a)
a chemical reaction took place
b)
the two substances had low boiling points
c)
one substance dissolved in the other
d)
the two substances are non-reactive
4.
Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction?
a)
CuCl2 + Al -> AlCl3 + Cu
b)
3CuCl2 + Al -> AlCl3 + 2Cu
c)
3CuCl2 + 2Al -> 2AlCl3 + 3Cu
d)
CuCl2 + 3Al -> AlCl3 + 2Cu
5.
Which observation would most likely indicate that an exothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
6.
The law of conservation of matter states that:
a)
matter is neither created nor destroyed.
b)
the mass of the products is always greater than the mass of the reactants.
c)
the mass of the products is always less than the mass of the reactants.
d)
matter is always converted into an equal amount of energy.
7.
Which observation would most likely indicate that an endothermic reaction has occurred?
a)
a color change
b)
the production of gas bubbles
c)
an increase in temperature
d)
a decrease in temperature
8.
Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(i) and (iv)
d)
(ii) and (iv)
9.
Oxidation is a process which involves
a)
addition of oxygen
b)
addition of hydrogen
c)
removal of oxygen
d)
removal of hydrogen
10.
MnO2 + 4HCl → 2 + 2H2O + Cl2
Identify the substance oxidized in the above . equation.
a)
MnCl2
b)
HCl
c)
H2O
d)
MnO2
100 %
