Melting
What is the change of state during melting?
Solid to liquid
What is the freezing point of ice?
0oC
What temperature does water boil at?
100oC
What is the change of state in condensation?
Gas to liquid
In places where the winters are very cold, the snow may disappear even when the temperature is well below freezing. What is this change of state called?
What is Sublimation?
What temperature does ice starts to melt?
0oC
When something freezes, it gains heat. True or false?
False.
When water is heated, what happens to the temperature of the water?
The temperature increases.
Name one place you have seen condensation.
On a cold glass/cold can/mirror after a shower/breathing onto your spectacles
When does Sublimation occur?
Sublimation occurs when the surface particles of a solid gain enough energy that they form a gas.
What is the temperature of the melting ice called?
Melting point
Which of the following shows freezing?
1) Water boiling in a kettle.
2) Rain forming clouds.
3) Ice forming in the freezer.
4) Chocolate melting.
3) Ice forming in the freezer.
Grandma says, "Put in the fishball when the water boils." What is the temperature of the water when it starts boiling?
100oC
What is an example of Condensation?
One example of Condensation is breathing onto a window.
During sublimation, particles of a ______ do not pass through the liquid state as they form a ___.
During sublimation, particles of a liquid do not pass through the liquid state as they form a gas.
What happens to the temperature of ice during melting?
Remains the same
What happens to the temperature of water during freezing?
It remains the same.
You see bubbles rising in a pot of soup on the stove. What is happening to the water in the soup?
It is boiling. The water is changing from liquid to gas (steam).
How does fog form?
Fog forms when water vapor in the air condenses into tiny liquid droplets.
What is an example of Sublimation?
An example of sublimation occurs with dry ice, which is solid carbon dioxide.
You left an ice cream cone out in the sun. After some time, it started dripping. What caused the ice cream to melt?
The ice cream gained heat from the sun, causing it to change from solid to liquid state.
Jay forgot to take his packet of chocolate out of his school bag. After a hot afternoon, he opened the bag and found chocolate all over his books. What caused this to happen?
The chocolate melted because it gained heat from the warm weather, changing the chocolate from a solid to a liquid state.
Sarah placed a pot of water on the stove to cook instant noodles. After a few minutes, bubbles formed and steam started rising. What caused the water to boil?
The water gained heat from the stove, changing it from liquid to gaseous state.
After Jane poured ice-cold water into her cup, she noticed tiny water droplets forming on the outside of the cup. What caused the droplets to appear?
1) The cup has a hole and is leaking.
2) The cup is sweating like you do after PE.
3) Water vapour in the air lost heat to the cooler surface of the cup and condenses to form the tiny water droplets.
4) Water vapour in the air gained heat from the cooler surface of the cup and condenses to form the tiny water droplets.
3)
At ordinary atmospheric pressures, carbon dioxide cannot exist as a liquid. So instead of melting, solid carbon dioxide _______ directly into a ___.
At ordinary atmospheric pressures, carbon dioxide cannot exist as a liquid. So instead of melting, solid carbon dioxide changes directly into a gas.