☰
Matter In Our Surroundings
The head of nail becomes warm when it is hammered into a plank of wood. Explain the series of energy transformations that have taken place.
When the moving hammer strikes the head of the nail, the kinetic energy of the moving hammer is converted into heat energy. As a resukt of the heat energy, the temperature of head of the nail increases.
Sponsor Area
Give reason for the following observations.
We can get the smell of perfume sitting several metres away.
What is the physical state of water at
a) 25°C
b)00C
c)1000C
What is the physical state of water at
0°C
What is the physical state of water at
100°C
Give two reasons to justify
Water at room temperature is a liquid.
Give two reasons to justify
An iron almirah is a solid at room temperature.
Why is ice at 273K more effective in cooling than water at the same temperature ?
What produces more severe burns, boiling water or steam ?
8. Name A, B, C, D, E and F in the following diagram showing state change :
Both boiling and evaporation convert a liquid into vapour. What is the difference between the two process
Sponsor Area
Sponsor Area