When the water molecules are heated, the molecules gain enough energy to escape from their liquid state and the water evaporates. The bubbles are filled with water molecules in the vapour (or gaseous) state. The liquid state of ice is called _____. (5 letters), 11. When heat is added, the particles start to vibrate faster and faster (as they gain kinetic energy), until they move fast enough to overcome the forces holding them together in fixed positions in the solid. It would be quite difficult to compare the three states of the same material, as the material would have to be at three different temperatures to be in three different states! Observe the change in state at the candle wax heats up. The process of turning a liquid into a gas is called _____. (5 letters), 9. Note: This is a great way to demonstrate contraction and expansion if you have one of these at your school. (They move faster.) What channel number is One America News on Dish Network? Is it more difficult to blow into the balloon when it is already full? Explain your answer. This section introduces us to physical quantities that are important when we study science. Steel. The particles in a solid are tightly packed and cannot be squeezed closer together into a smaller volume. Describe the arrangement in liquid particles? You do not have to measure their masses on a scale. Shake it gently. Does this mean the flour is a liquid? Learners need to be able to interchange between the units. Note: Learners might battle with this, but you can give them an example. Get learners to briefly discuss what stink bombs are for. Explain why you think it was impossible to blow up the balloon inside the bottle? Calculate the exact mass of each piece. You can also do some more examples, such as ask how many grams in 1.25 kg (1250 g), how many milligrams in 12.5 grams (12 500 mg)? Do this on a different day, to allow the vanilla smell to escape from the classroom, and from learners sensory receptors, between experiments. Get the learners to come up with some ideas in class. AIM: What is your aim for this investigation? Denser materials have a greater mass in relation to their size; that is why they feel 'heavy'. Melting and freezing are the reverse processes of each other and so are evaporation (boiling) and condensation. What are your predictions? Liquid particles are not "arranged" so to speak. What are the three states called? Will it be larger than, smaller than, or the same size as before it was heated? Notice how the yellow liquid swirls and spreads out as the yellow particles mix with the colourless particles. These freely moving particles allow a liquid to flow from place to place. If you have access to a Gr. When we measure small volumes we use millilitres (ml) as the volume unit. How do the densities of solids, liquids and gases compare? This causes an increase in pressure. That means the liquid particles are constantly colliding and are sent into a new direction with each collision.

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