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Solutions and Solvents
S1 Science ETV – The Wonderful Solvent - Water
1.Which of the following description about
dissolving is NOT correct?
When we add a solid into a liquid, the solid
spreads out in the liquid.
A solution is a mixture of solvent and solute.
After dissolving, the solute no longer exists.
Solute dissolves in solvent and disappears.
It is because solute particles are too small
and cannot be seen by naked eyes.
2. Which of the following affects the rate of dissolving?
The size of solute particles
The arrangement of solute particles.
The rate of solute particles come off from the
solute surface and mixes with solvent particles.
The arrangement of solvent particles
3. Stirring can increase the rate of dissolving,
it is because
Stirring can raise the temperature of solution.
Stirring allows the solvent to hold more solute
particles.
Stirring can make the solute particles come off
from the solute surface more easily.
Stirring can raise the temperature of
solvent.
4. Which of the following is not an example of
liquid dissolves in another liquid?
Milk added to hot tea.
Honey dissolves into hot water.
Soy sauce dissolves in soup.
Oil added to hot water.
5. Which of the following is not an example of
gas dissolves in liquid?
Carbon dioxide gas dissolves into
water to form soft drink
Oxygen dissolves into running water
Presence of oxygen in the air
6. Which of the followings are dissolved in water
to form coca cola?
(I) gas carbon dioxide
(II) solid white sugar
(I) and (II) only
(I) and (III) only
(III) concentrated
solution of coca cola
(II) and (III) only
(I), (II) and (III)
7. In the process of producing coca cola, white
sugar is dissolved in water of about ________℃
20℃
30℃
40℃
50℃
8. Adding sugar continuously into water until it cannot
dissolve anymore, the solution formed is a _______.
Syrup
Saturated solution
Filtrate
Hot solution
9. What would happen if a saturated solution is cooled
down quickly with ice water?
Small and powder-like crystals will appear.
As the saturated solution is cooled down, it
changes into solid.
The amount of water in the solution decreases,
this causes the formation of crystals.
Large crystals will be formed.
10. The ETV programme demonstrates growing of crystals.
The name of this crystal is _______.
Sodium nitrate
Sodium acetate
Sulphur
Sodium sulphate
11. According to the ETV programme, what is the
colour of cobalt (II) sulphate?
White
Yellow
Orange
Blue
12. Which of the followings are crystals we
encounter in our daily life?
(I)
(II)
(III)
(IV)
single crystal sugar
granulated sugar
rock sugar
MSG
(I) and (II) only
(I) and (III) only
(I), (II) and (III) only
(I), (II), (III) and (IV) only
13. Wood is non-crystal. It is because
It is not transparent
The basic particles of wood are not wellaligned.
It is not formed by cooling of saturated
solution.
Wood comes from plants and it is not
chemical substance.
14. What are the criteria for natural crystals to
become precious stones?
(I) The stone must be
beautiful.
(II) The stone must be
durable.
(III) The stone must be
rare.
(I) only
(I) and (II) only
(II) and (III) only
(I), (II) and (III)
15. Which of the following about the formation
of natural crystals is NOT correct?
Precious stones originate in magma deep
underneath the earth crust.
Magma subjected to a long period of high
pressure and temperature crystallizes slowly.
Magma reaches the earth surface and
becomes lava. Lava cools, precious stones are
formed.
Lava cooled by sea water causes the
formation of precious stones.
16. Which of the following stones are classified
as cubic system precious stones?
(I)
(II)
(III)
(IV)
Garnets
Green sapphires
Diamonds
Rubies
(III) only
(I) and (II)
(I) and (III)
(I), (II) and (III)
17. Which of the followings are classified as
organic solvents?
(I)
(II)
(III)
(IV)
acetone
alcohol
chloroform
thinner
(I) and (II) only
(I) and (III) only
(I), (II) and (III) only
(I), (II), (III) and (IV) only.
18. Which of the followings are the characteristics
of thinner?
(I) It can dissolve
paints
(II) It can dissolve
acrylic sheets
(I) and (II) only
(I) and (III) only
(III) It is highly volatile
(IV) It can be used for
diluting floor wax
(I), (III) and (IV) only
(I), (II), (III) and (IV)