grade 6 , con 5 , lesson 2

The average temperature is almost .....the final temperature of the mixture of two substances with different temperatures at the thermal equilibrium.

• more than

• less than

• equal to

• double

If you pour a cup of water with temperature 30°C to another cup of water with temperature 80°C, the average temperature of the mixture may be......

• 80°C

• 30°C

• 55°C

• 110°C

The final temperature of two mixed substances with different temperatures is less than that of the ..........substance and greater than that of the ..........substance

• hotter-cooler

• cooler - hotter

• bigger - smaller

• smaller - bigger

After mixing two substances with different temperatures, the molecules of the cooler substance will.......

• move faster.

• not be affected.

• move slower.

• stop moving.

.................occurs when heat transfer stops between two objects as they reach the same temperature.

• Calorie

• Heat flow

• Sound equilibrium

• Thermal equilibrium

The measuring unit of heat is called..........

• calorie.

• kilogram.

• gram.

• meter.

Hitting a piece of metal several times by a hammer causes..................

• the temperature of the metal becomes lower.

• molecules of the metal move slower.

• molecules of the metal move faster.

• the metal becomes cooler.

On heating a substance, the.......of its molecules

• kinetic energy - decreases.

• temperature - decreases.

• kinetic energy - increases.

• movement - decreases.

When mixing two substance with different temperatures their average temperature is lower than the final temperature

• True

• False

Heat is measured in calorie

• True

• False