Particle model sheet a review of year 7 New Topic New Title Kinetic Theory Do now Particle model sheet a review of year 7

Homework Homework – 1. Finish Draw these sentences 2. Stick in all your loose worksheets by Sunday 12th February 3 Java Lava Power

This lesson State the distinguishing properties of solids, liquids and gases. Describe the molecular structure of solids, liquids and gases. Interpret the temperature of a gas in terms of the motion of its molecules. Relate the properties of solids, liquids and gases to the forces and distances between molecules and to the motion of the molecules.

Properties of solids, liquids and gases Make notes of the following slides

Solids Fixed shape and volume Particles together by strong forces of attraction called bonds they vibrate about fixed positions Difficult to compress Generally dense

Liquids Shape has a fixed volume but can flow and change shape The particles vibrate and can change position Not easy to compress Generally dense Water to ice

Gases . Shape can change Particles can move freely They move at high speed colliding with each other and the walls of their container Easy to compress Low density Liquid to gas Turbulent gases in space Red represents - sulfur; green - hydrogen; blue - oxygen.

Solids, liquids and gases States of Matter

Temperature- Microscopic Temperature is a measure of the average random kinetic energy of the particles in a substance. Note that they are not all travelling at the same speed.

Temperature The hotter the temperature, the faster the average speed of the particles Note that they are not all travelling at the same speed.

Draw the sentence 1. 2. 3. 4. 5. 6. 7. 8.

Draw these sentences! The particles in a solid are close packed, in regular positions and vibrate around a fixed point. The particles in a liquid are also close packed, they vibrate but can also move around randomly. Particles in a liquid are NOT further apart than particles in a solid. The particles in a gas are far apart and move randomly. The particles in a gas are about 10 times further apart than in a solid or liquid The hotter a gas is, the faster the particles move. The particles in a solid, liquid or gas are the same size (provided it is the same substance) Physics is the most interesting subject..

Draw these sentences! The particles in a solid are close packed, in regular positions and vibrate around a fixed point. The particles in a liquid are also close packed, they vibrate but can also move around randomly. Particles in a liquid are NOT further apart than particles in a solid. The particles in a gas are far apart and move randomly. The particles in a gas are about 10 times further apart than in a solid or liquid The hotter a gas is, the faster the particles move. The particles in a solid, liquid or gas are the same size (provided it is the same substance) Physics is the most interesting subject..

Homework Homework – 1. Finish Draw these sentences 2. Stick in all your loose worksheets by Sunday 12th February 3 Java Lava Power

How do we know? Next lesson in Mr Garnett’s Room SS13

Brownian motion Robert Brown

Write down what you observed. What did you see? Write down what you observed. What did you see? How would you describe their motion? How do you explain the motion of the smoke particles? Brownian motion

What did you see? The smoke smoke particles are observed as points of light, their jiggling or random motion is due to collisions with much smaller and invisible air particles. You can see the smoke particles not the very small air particles.

Brownian motion – Fat droplets in milk Brownian Motion - YouTube

Brownian motion is the seemingly random movement of particles suspended in a fluid (i.e. a liquid or gas). It is due to the instantaneous imbalance in the combined forces exerted by collisions of the particle with the much smaller liquid molecules surrounding it.

Evidence Brownian motion is evidence the existence of atoms or molecules and their random movement This random motion can be modelled mathematically This was one of Einstein’s great papers of 1905.

Myth Busters Robert Brown is correctly referred to as having observed the jittering motion of small particles, but he wasn't the first to record the observation, call Brownian motion this was by Jan Ingenhauz (photosythesis) in 1785 using charcoal dust. he did NOT observe the motion of actual pollen grains.

Solids, liquids and gases Let’s try a simulation!

Properties of solids, liquids and gases Make notes of the following slides if you wish!

Solids Fixed shape Cannot flow Difficult to compress Generally dense

Liquids Shape can change Can flow Not easy to compress Generally dense

Gases Shape can change Can flow Easy to compress Low density