Particle theory

The questions in your test are set out below. You do not lose marks for wrong answers. Once you have completed the test, click Submit.

Your First Name:
Your Last Name:

1. Look at the image on the right. Which comment best describes the different states of water.

A) "C" represents water molecules in the gas state. The amount of energy they possess is far greater than in the solid or liquid states. B) "A" represents water molecules in the liquid state. The moleucles will spread out to fill the container they are in. C) "B" represents water molecules in the solid state. The amount of energy they possess is far less than in the gas or liquid states. D) "B" represents water molecules in the solid state. The molecules in this state maintain their positions next to each other and do not move to take up the shape of the container they are placed in. E) "c" represents water molecules in the liquid state. The amount of energy they possess is far greater than in the solid or gas states.

2. Ice crystals are formed from water molecules. Which one comment below is true?

A) The water molecules in an ice crystal do not move when heat is applied to melt the ice. B) The water molecules in an ice crystal have a great deal of space between them and move at very high speeds. C) The water molecules in an ice crystal are free to move about and slide past each other. D) The water molecules in an ice crystal are fixed in position and simply vibrate. E) Molecules that form an ice crystal have more energy than those that form steam.

3. Jonathon was describing an unknown substance when he said "The substance has no shape of its own but the particles stay together". Which one of the following options best describes the substance?
A) Ice cube. B) Hot gas. C) Solid. D) Cold gas. E) Liquid.

4. The pressure in an aerosol can is created by:
A) very slow moving gas particles. B) solid particles inside the can vibrating with great intensity. C) vibrating solid particles. D) slow moving liquid particles. E) fast moving gas particles.

5. Sometimes a metal lid can stick onto a glass jar. Running the lid under hot water often loosens it. Why is this so?
A) The glass jar heats up and contracts. B) The metal lid heats up and expands. C) The heat decreases the speed of air molecules trapped inside the jar. D) The heat causes low pressure inside the jar. E) The metal lid contracts when heated and is easily removed from the jar.

6. Below are some properties of matter. A) A very fast rate of diffusion. B) Maintains it shape. C) Is made of slowly vibrating particles. D) Is formed during the process of condensation. Which one comment below is true?
A) Property "A" can be identified with a gas. B) Property "B" can be identified with a gas. C) Property "C" can be identified with a gas. D) Property "D" can be identified with a gas. E) Property "B" can be identified with a liquid.

7. Which of the following comments best describes a liquid?
A) Takes on the shape of the container that it is placed in. B) Expands to occupy the entire volume of the container it is placed in. C) Has a fixed shape and volume. D) Has a fixed shape but no specific volume. E) Its volume decreases as heat is applied.

8. The plunger of a syringe is easily pushed in when the syringe is filled with air rather than water. Why?

A) The particles(molecules) of a liquid remain fixed in their positions and are very hard to move past their neighbouring molecules. B) There is a great deal of space between the molecules of a gas. C) There is more space between the molecules of water than the molecules of air. D) Water molecules have a strange shape that allows them to move closer together when a force is applied. E) Gas molecules move very slowly when compared to those of liquids allowing gases to be compressed easily.

9. Blue food dye is dropped into a beaker of water and slowly spreads throughout the entire beaker, as shown on the right. Which statement offers the best explanation for this?

A) The dye particles are held together tightly and the water molecules can not break them apart. B) The water molecules move apart with great speed, creating huge areas of emtpy space in which dye molecules fall into. C) The water increases its volume and allows the dye molecules to dissolve. D) Water molecules are in constant motion, bumping into the dye particles and pushing them apart. E) The water molecules stay in fixed positions allowing the dye molecules to slowly flow around them.

10. When a liquid is strongly heated it forms a gas. This process is best known as:
A) melting B) solidifiction C) sublimation D) evaporation E) condensation.