Friends Boys SchoolScience Department

9th grade (MYP-4) Nature of matter Worksheet (1)

Name: ___________________

Choose the correct answer for each of the following:

1. The diagram shows particles in a solid, a liquid and a gas. Which arrow represents freezing?

2. A coloured liquid vaporises easily at room temperature. Some of the liquid is placed at the bottom of a sealed gas jar. Which diagram shows the appearance of the jar after several hours?

3. In which substance are the particles furthest apart at room temperature?A ethanol (Alcohol)B methane (Natural Gas)C saltD sugar

4. The diagram shows a glass containing ice cubes in a fizzy drink.What has particles that are close together but free to move past each other?A bubbles B drinkC glass D ice cubes

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5. The diagrams show the arrangement of particles in the three states of matter.

What are the three states?

6. A solid metal is heated until it turns to vapour. The graph shows the temperature of the metal during this process. Which part of the graph represents the metal melting?

7. What could be the melting point and boiling point of water containing a dissolved impurity?

8. A sealed syringe, containing trapped air, is placed in a beaker of hot water.

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melting point / °C boiling point / °C

A 0 100

B 0 104

C –3 100

D –3 104

What happens to the trapped air and the air particles?

9. In which states do particles diffuse rapidly?

10.Which object contains substances in all three states of matter?

11. In which of the following are the particles arranged in a regular pattern?A a crystal B a gas C a liquid D a solution

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trapped air air particles

A expands get larger

B expands move more quickly

C contracts get smaller

D contracts move more slowly

in a gas in a solid

A ✔ ✔

B ✔ ✘

C ✘ ✔

D ✘ ✘

Part II: Answer the following questions:

1. A student set up the apparatus shown.

After two minutes, a white solid was seen at point X, where fumes of hydrogen chloride and ammonia had reacted.(a) State the name of the white solid formed at point X. ……...........................................

(b) Use ideas about particles to explain these observations.

2. Sketch the heating curve for pure Ethanol, between –30oC and 100oC. Mark in the temperatures at which water changes state and its state for each sloping part of the graph. (Note that for pure ethanol, the melting point is -15oC and the boiling point is 78oC)

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3. What causes the pressure of a gas?

4. Explain why the pressure of a gas in a sealed container increases with heating?

5. If you put a cup of hot tea on an accurate balance, the reading will drop as you watch it. Why?

Good LuckGood Luck

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