Yr+7.2+Solids+Liquids+and+Gases

=Solids Liquids and Gases= = = =Course outline= =Glossary=

Online test
you will be asked to enter your first name and last name http://www.classroomclipboard.com/490625/Home/Test/715374be3465581ed8575674e05aaf8a#/Finished.xaml
 * Instructions**
 * 1) put your **class** in front of your first name (in the first field or type box) Eg 7E Sarah
 * 2) put your last name in the second field Eg ** Smith **
 * 3) put this access code in the third field 8HCJB
 * 4) click this link to get to the online test

Special tasks Animation of states of matter watch the animation and write a definintion for the terms that show the various changes of state. Another animation showing the effect of pressure http://phet.colorado.edu/en/simulation/states-of-matter

=Answers to worksheets=

=Solids, Liquids and Gases Interactive Activities=

Part 1: The Particles in Solids, Liquids and Gases http://www.media.pearson.com.au/schools/cw/au_sch_rickard_sd1_1/int/matter.html

Hover over liquid, ice and air to see how the particles are different between the three states of matter.

Part 2: Changing States http://www.bbc.co.uk/schools/scienceclips/ages/9_10/changing_state_fs.shtml

What state of matter is ice? _

What will happen if we apply heat to a block of ice?

__Heat the ice to see if you are correct. If not, write in the correct answer.__

__What will happen if we cool it down again?__ _

__Cool the ice to see if you are correct. If not, write in the correct answer.__

__If we change the ice back to water, then heat it up, what will happen?__ _

Change the ice back to water by heating it, then heat it again. Check if your answer is correct. If not, write in the correct answer.

How does the volume (how much space it takes up) change in each of these circumstances?

Does ice, liquid or gas have the smallest volume? Why? _

__Does ice, liquid or gas have the largest volume? Why?__ _

What will happen to the gas if we take the lid off the container? Why?

Take the lid off the container to see if you are correct. If not, write the correct answer.

Part 3: Heating Solids Water is not the only substance that can be changed from one state of matter to another. Applying heat to other solids can also melt them.

http://www.bbc.co.uk/schools/scienceclips/ages/8_9/solid_liquids_fs.shtml

Choose a substance to work with by using the arrows at the bottom of the page.

Heat the substance.

What happens to the substance when it’s heated? _

__Click test to shake the beaker.__

__Describe how the liquid moves__ _

Change the substance back into a solid. How will you do this? Click test to shake the beaker.

Describe how the solid moves _

__Part 4: Turning Liquid into Gas__ __http://www.bbc.co.uk/schools/scienceclips/ages/9_10/gases_fs.shtml__

__Part 5: Movement of Matter Particles__ __http://www.media.pearson.com.au/schools/cw/au_sch_rickard_sd1_1/int/2_slg.html__

__Observe the particles shown. Imagine they are the particles in a block of ice.__

__What is currently happening to the particles?__ _

What do you think will happen to the particles if we heat them?

Heat the particles

Describe what happens as heat is applied to the particles

__Describe what happens as the temperature cools down__ _

Why do you think this happens? __

Need a more detailed explanation? The particles in solids are constantly vibrating. The particles are so small and the movement is so S-L-O-W that they appear not to move at all! Remember that the particles are held very strongly together and only jiggle about in their places – the solid keeps its shape.

However, solids can melt. If you leave ice-cream on a bench it will soon become a liquid. In order to do this, the solid needs ENERGY. Particles in a liquid have more energy than the particles in a solid. This energy can come in the form of heat. As more heat is applied to a solid, its particles begin moving faster and faster and the bonds between them loosen. This allows the solid to become a liquid, or melt.

If we continue heating the liquid, its particles will continue to move faster until eventually the bonds between the particles break completely! They are then free to move around. Gas particles have more energy than liquid particles.

When we cool gases, the opposite will happen. The particles get slower and slower, and can turn back into a liquid when bonds form between them. The particles may become so slow they turn back into a solid.

Did you know? Sometimes solids can change straight into a gas, without becoming a liquid first. This process is called sublimation.

http://www.media.pearson.com.au/schools/cw/au_sch_rickard_sd1_1/int/2_slg.html

Choose ‘Sublimation’ at the bottom of the page and click heat to show this process.

Answers 2a. Solid b. It will melt and become water. c. Freezes and turns into ice again. d. Evaporates and turns into a gas. e. Ice has the smallest volume because the particles are packed very closely together. Gas has the greatest volume – its particles can be spaced apart & will spread to fill the container. f. Will escape as gas particles are free to move.

3a. Melts & turns into a liquid. b. Moves around, flows in the container. c. Retains its shape, doesn’t flow.

4.

5a. Vibrating a little. b. Vibrate more and more, bonds between them loosen. Turns into a liquid. As we keep heating liquid continues moving faster, bonds eventually break, forming a gas. Vibrate more as they get more energy.