Starter quiz
- A rectangular block of steel has a length of 8 cm, a width of 4 cm and a height of 3 cm. What is the volume of the block in cm³?
- '96' ✓
- Which of the following pieces of equipment can measure the volume of a liquid most precisely?
beaker
conical flask
measuring cylinder ✓
test tube
- In which state of matter do the particles in water move the fastest?
- solid
- liquid
- gas ✓
-
- How close together are the particles of a liquid?
- touching each other ✓
- close together with a few touching
- close together with spaces between each one
- spread out with large gaps between
-
- What happens to the particles that make up a gas when it is heated to a higher temperature?
- They move at the same speed.
- They move at the same speed and spread further apart.
- They move more quickly.
- They move more quickly and spread further apart. ✓
-
- Why would touching a very hot piece of solid metal burn your skin?
- Its particles transfer energy to your skin so quickly they damage skin cells. ✓
- Its particles are moving around so quickly they damage skin cells.
- Its particles are spreading out so quickly they damage skin cells.
-
Exit quiz
- 50 cm³ of water at 80°C is mixed with 50 cm³ of water at 40°C. What will be the resulting temperature of the mixture?
- 40°C
- 60°C ✓
- 80°C
- It is impossible to predict.
-
- 100 cm³ of water at 60°C is mixed with 50 cm³ of water at 30°C. What will be the resulting temperature of the mixture?
- 30°C
- 40°C
- 50°C ✓
- 60°C
-
- 100 cm³ of water at 80°C is mixed with 300 cm³ of water at 40°C. What will be the resulting temperature of the mixture?
- 80°C
- 70°C
- 60°C
- 50°C ✓
- 40°C
-
- What word describes the directions in which particles of water move in the liquid or gas state?
- 'random' ✓
- What happens when faster moving particles of a hot solid collide with slower moving particles of a cold liquid?
- On average, the particles of the solid slow down. ✓
- On average, the particles of the solid speed up.
- On average, the particles of the liquid slow down.
- On average, the particles of the liquid speed up. ✓
-
- Why does a cube of solid water (ice) melt when it is put into a glass of lemonade at room temperature?
- Particles of the lemonade cause particles of the water to break apart.
- Particles of the lemonade cause particles of the water to melt.
- Particles of the lemonade cause particles of the water to move faster. ✓
- Particles of the lemonade cause particles of the water to shrink.
-
Worksheet
Loading worksheet ...
Presentation
Loading presentation ...
Video
Lesson Details
Key learning points
- Mixing hot water with cold water results in water cooler than the hot water and warmer than the cold.
- When hot and cold water are mixed, the temperature is closer to that of the water there was more of.
- A cold object placed in hot water makes the water particles move more slowly and those in the object move more quickly.
- A hot object placed in cold water makes the water particles move more quickly and those in the object move more slowly.
Common misconception
When samples of water are added at different temperatures, some pupils add or subtract the temperatures, applying a mathematical process without appearing to think about what is happening.
Ask pupils to predict changes to the resulting temperature using water at a range of starting temperatures and then demonstrate each one, measuring the temperature of the resultant mixture each time.
Keywords
Volume - the amount of space an object takes up
Particle model - the idea that all objects are made of tiny particles that are in constant motion
Temperature - the higher the temperature of an object, the faster its particles move and the hotter it is
Collide - when two objects bump into each other
+