SCIENCE UNIT 2
1. Complete the word equation :
Metal + Oxygen _____________________
A. hydrogen D. metal oxide
B. metal hydroxide + hydrogen E. metal oxide + hydrogen
C. metal chloride + water
2. Which of these is the correct symbol equation for the reaction of group 2 element strontium with
oxygen?
A. 2Sr + O2 SrO D. 2Sr + 2O2 2SrO
B. 2Sr + O2 2SrO E. Sr + O2 2SrO
C. Sr + 2O2 SrO
3. Rusting is a special term, given to the corrosion of which metal.
A. Zinc D. Iron
B. Copper E. Magnesium
C. Nickel
4. The RAC noticed that cars rust faster when owned by people who live by the sea, compared with people
who live inland. What is the main reason for this?
A. The wind increases the concentration of oxygen at the seaside
B. Seagull droppings are acidic
C. Sea breezes make it cooler at the seaside
D. Sea water spray is full of sodium and chloride ions
E. Longer hours of sunshine at the seaside lead to increased rusting
5. Complete the word equation:
Metal + Oxygen ______________
Metal + Water ______________ + ____________
Metal + Acid ______________ + ____________
a. Barium + Oxygen ________________
b. Lead + Sulphuric Acid _______________ + ____________
c. Calcium + Water _____________ + ____________
d. _________ + Water Lithium Hydroxide + ____________
e. Magnesium + Hydrochloric Acid _______________ + ____________
f. Sodium + ________ Sodium Oxide
g. Potassium + _________ Potassium Hydroxide + ____________
h. _________ + _________ Copper Nitrate + ____________
i. _________ + Oxygen Rubidium Oxide
6. Small pieces of four different metals were placed in identical amounts of hydrochloric acid. The results
are shown below.
Place the metal in order of reactivity from the MOST reactive to the LEAST reactive.
7. Iron is a metal that has many uses.
One problem with iron is that it can rust when exposed to air.
a. Name the two substances that must be present in air for iron to rust.
1. ____________
2. ____________
b. These are four methods of preventing iron from rusting
Painting
Oiling
Galvanizing
Coating in plastic
Complete the table by giving the best method of preventing each item from rusting.
Item Method
Bicycle chain
Bridge
Car body
c. Which of these metals is used to galvanise iron?
Aluminium
Lead
Tin
Zinc
8. Balance these equations below.
a. ___ H3PO4 + ___ KOH ___ K3PO4 + ___ H2O
b. ___ K + ___ B2O3 ___ K2O + ___ B
c. ___ HCl + ___ NaOH ___ NaCl + ___ H2O
d. ___ Na + ___ NaNO3 ___ Na2O + ___ N2
e. ___ C + ___ S8 ___ CS2
f. ___ Al(OH)3 + ___ HBr ___ AlBr3 + ___ H2O
g. ___ NH4OH + ___ H3PO4 ___ (NH4)3PO4 + ___ H2O
9. Transfer the following word equations into symbolic equations.
a. Gaseous propane, C3H8, burns in oxygen gas to produce gaseous carbon dioxide and liquid water.
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b. Hydrogen fluoride gas reacts with an aqueous solution of potassium carbonate to produce an
aqueous solution of potassium fluoride, liquid water, and gaseous carbon dioxide.
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c. Hydrogen gas reacts with nitrogen gas to produce gaseous ammonia.
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d. Copper metal is heated with oxygen gas to produce solid copper (II) oxide.
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10. Transfer the following symbolic equations into word equations.
a. HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
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b. HCl (aq) + LiOH (aq) → LiCl (aq) + H2O (l)
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