TERM 2: SCIENCE TEST PREPARATION
CHEMICAL AND PHYSICAL CHANGES
Go and do these quiz question
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http://dimdima.com/science/Quiz/show_quiz.asp?q_aid=13&q_title=States%20of%20Matter
http://www.chem4kids.com/extras/quiz_matterstates/index.html
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Quiz
1) Use this Venn Diagram to compare & contrast the three states of matter
1. Why is melting sugar a physical change but burning sugar is chemical change?
2. What is required for matter to change from one state to another?
3. What happens to most solids when they freeze?
SOLUBILITY IN WATER
1. Circle items that are soluble in water
Oil, sugar, salt
Red means answer
2. Colloids are solutions with very small particles suspended in a liquid.
True
False.
3. The concentration of solutions is directly related to...
Solubility
Temperature
Pressure
All of the Above.
4. Name two situations were chemical changes cause damage to items.
5. Name two situations when chemical changes are useful for creating
substances.
FREEZING, MELTING AND PRESSURE
Identify chemical and physical change
in daily activities.
1. Making a cake
2. Rotting fruit or food spoiling
3. Water evaporating into the
atmosphere
4. Soil erosion
5. Boiling an egg
6. Butter melting in a pan
7. Soda freezing in the freezer
8. Making bread
9. Plants decaying
10. Silver tarnishing
11. Chocolate bar melting in
the sun
12. Chopping a block of wood in
two pieces
13. Burning wood
14. Driving a nail in a board
15. Digesting food
16. Blowing up a balloon
17. Popping popcorn
1. How does pressure affect freezing point?
2. Can you suggest why water expands when it is frozen?
REVERSIBLE CHANGES BOILING, EVAPORATING AND CONDENSING?
1. Identify the following situations as reversible or irreversible changes.
1. When peas are frozen they go hard.
2. When whisked egg is heated it scrambles.
3. When bicarbonate is added to water it fizzes.
4. When an ice cream is left in the sun it melts.
5. When custard powder is mixed with water it thickens.
6. When iron is exposed to water it goes rusty.
7. When bath salts are added to water they dissolve.
8. Write about two irreversible changes which cause damage.
9. Write about one irreversible change that is considered as useful.
Identify the following situations in terms of Condensation or Evaporation
1. If you spill a little petrol on the ground at the petrol station, it rapidly
disappears.
2. Paint dries on walls after a few hours.
3. When you spray perfume on your body, it feels cold.
4. When you breathe on the inside of the window when it is cold outside, a mist
appears.
5. Sometimes it rains for a short time in the morning, but by the afternoon the
puddles have disappeared.
6. On a rainy day the car windscreen mists up.
7. When you boil potatoes in the kitchen, water droplets run down the windows
or walls.
8. Clouds form on a hot day over the sea.
9. Water keeps flowing into the Dead Sea, but the level is slowly dropping.
Changing state
1. What happens during evaporation?
A gas changes to a liquid
A solid changes to a liquid
A liquid changes to a gas
2. Butter going soft and runny on a hot day is an
example of
freezing
melting
condensing
3. What is the missing word? When water is...., it
starts to change from a liquid to a solid.
cooled
heated
boiled
4. Clouds are formed by
rain falling
hot air rising
water vapour condensing
9. The movement of water around and around our
world is called...
condensation
the water cycle
evaporation
5. We use the same water today that dinosaurs
used when they lived on the Earth. Is this true or
false?
True
False
Neither
6. A gas condenses into a liquid when it is...
cooled
warmed
boiled
7. Which process is the opposite of
condensation?
Melting
Freezing
Evaporation
8. Which of these statements is FALSE?
Evaporation is a change that can be reversed
Evaporation only happens at 100°C
Evaporation is helped by heat and by wind
10. Which of these is NOT a part of the water
cycle?
The Sun evaporates water on the Earth's
surface into water vapour
The water vapour rises, and cools and
condenses into clouds
When it rains, the clouds melt
Gases, liquids and solids
1. Which of the following is NOT a gas?
Air
Car exhaust fumes
The sea
2. You blow up a balloon. Is it heavier or lighter
than the uninflated balloon?
Heavier
Lighter
They weigh the same
3. When you squeeze a sponge under water, what
are the bubbles that escape?
Pieces of sponge
6. To change a solid metal to a liquid, you would
heat it
cool it
bend it
7. Which of these is NOT an example of a solid?
Dust
Runny honey
Gravel
8. Which one of these best describes a solid?
My particles are packed tightly together. I keep my shape.
My particles are loosely packed. I take the shape of my
container.
Air coming from the spaces in the sponge
My particles have lots of room. I try to spread out in every
direction.
Water
9. Which one of these best describes a liquid?
4. Which material is a liquid?
Sponge
Shampoo
Salt
5. Which material is a solid?
Syrup
Cooking oil
My particles are packed tightly together. I keep my shape.
My particles are loosely packed. I take the shape of my
container.
My particles have lots of room. I try to spread out in every
direction.
10. Which one of these best describes a gas?
My particles are packed tightly together. I keep my shape.
My particles are loosely packed. I take the shape of my
container.
Cotton wool
My particles have lots of room. I try to spread out in every
direction.