I. Multiple Choice. Encircle the letter that corresponds to the correct answer in each of the
following items
1. Which of the following substances is an element?
A. Air
B. Water
C: Salt
D. Iron
2. What are the two components of water?
A. Oxygen and Hydrogen
C. Hydrogen and Helium
B. Oxygen and Helium
D. none of these
3. A gaseous material has a strong smell, evaporates quickly, particularly boils at 40° C and
melts at -70°C. This material can be classified as
A. Metal
B. Mixture
C. Solution
D. Pure Substance
4. What process is involved in separating the components of seawater mixture?
A. Condensation B. Decantation
C. Distillation
D. Evaporation
5. Sugar is heated in a test tube until it completely changed into a black mass and droplets of
water. This experiment indicates that sugar is
A. an element
C. a compound
B. a solution
D. a mixture
6. Which of the following is a compound substance?
A. Manganese
C. Helium gas
B. Sodium chloride
D. Magnesium
7. Calcium chloride is a compound of the two elements calcium and chlorine. Which of the
following statements is TRUE?
A. Calcium chloride is listed in the periodic table of elements.
B. The symbol for calcium chloride includes Ca and Cl.
C. Chlorine may still be broken down into simpler form.
D. Calcium and chlorine belong to the same group in the periodic table.
8. Silver, gold and iron are metals. Which INCORRECTLY describes a metal?
A. Metals are ductile.
C. Metals are good conductors of heat.
B. Metals are malleable.
D. Metals are good insulators.
9. What do you call the process involved in decomposing water into hydrogen and oxygen?
A. Filtration
B. Distillation
C. Electrolysis
D. Decantation
10. It is the simplest form of matter which cannot be divided any further.
A. Mixtures
B. Element
C. Compound
D. Suspensions
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Answer:
1.d
2.a
3.c
4.b
5.c
6.b
7.b
8.d
9.b
10.b