4. Water boils at 100˚C and pure ethanol at 78˚C. Which of the statements are
TRUE about water and ethanol?
I. Water and ethanol are pure substances.
II. Water and ethanol can be boiled at either 100˚C or 78˚C.
III. Water and ethanol have specific temperatures at which they
would start to boil.
IV. Water and ethanol can be identified according to temperature at
which they boil.
A. I only
B. I, II and IV
C. III only
D. I, III, and IV
5. Sodium chloride dissolves in water very well. Which is NOT TRUE in the
following statements?
A. Water is a pure substance.
B. Sodium chloride is a pure substance. C. Dissolving sodium chloride with water produces a mixture.
D. Dissolving sodium chloride with water produces a new substance.
6. Ana wants to compare the chemical properties of two substances. In doing it, he prepared two flasks containing the substances and labeled them Liquid A and Liquid B. He monitored the boiling points of the liquids and found that the
boiling points were 100˚C for substance A and 110˚C - 112˚C for liquid B. How
would you classify the two liquids?
A. Liquid A is pure substance while Liquid B is a mixture.
B. Liquids A and B contain two or more atoms that are chemically bonded.
C. Liquid A has varying boiling points while liquid B has a fix boiling point.
D. Liquid A may be homogenous or heterogeneous but substance B is not
7. A white powder was tested and heated. After some time, it melts completely. What does it imply?
A. It is a mixture.
B. It is a pure substance.
C. It is a homogeneous mixture.
D. It is a combination of pure substance and mixture.
Two liquids were observed and heated. The data gathered is shown in the table
below.
DATA
|
\ /
LIQUID A LIQUID B
After 30 sec 100 85
After 60 sec 100 84
After 90 sec 100 86
8. Based on the table above, which of the following is TRUE about Liquid A?
A. It has a fixed boiling point.
B. It is heterogeneous.
C. It is a mixture.
D. It is an element.
9. Which of the following could be Liquid A?
A. Fruit juice
B. Soft drinks
C. Water
D. water – salt solution
10.Ethan wants to separate the marbles in a jar full of water. Which of the
following is the BEST way to separate the mixture?
A. Decantation
B. Dissolving
C. Evaporation
D. Using a magnet
11.Which of the following will Jeofrey do to segregate the rubber bands of different
colors?
A. Decantation
B. Evaporation
C. Filtration
D. Physical manipulation
12.What is the BEST way to use in separating iron fillings from a mixture?
A. Filter paper
B. Magnet
C. Water
D. Spoon
13.Which of the following uses evaporation as a means of separating the
components of the given mixture?
A. Oil and water
B. Pebbles and sand
C. Sand and gravel
D. Salt and water
Answers
Answered by
5
Answer:
13
oil and water
12
filter paper
Answered by
20
Choose the correct answers :
4) B,5) D,6) A,7) C,8) A,9) C,10) A,11) D,12) B,13) B.
Explanation:
4) B. I, II and IV
Water and ethanol are pure substances.Water and ethanol can be boiled at either 100˚C or 78˚C.Water and ethanol can be identified according to temperature at which they boil.
5) D. Dissolving sodium chloride with water produces a new substance.
6) A. Liquid A is pure substance while Liquid B is a mixture.
7) C. It is a homogeneous mixture.
8) A. It has a fixed boiling point.
9) C. Water
10) A. Decantation
11) D. Physical manipulation
12) B. Magnet
13) B. Pebbles and sand
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