Question 1:
State the types of particles that exist in a copper wire.
Answer:
Atom
State the types of particles that exist in a copper wire.
Answer:
Atom
Question 2:
Lily dries her hair with a hair dryer.
(a) Name the process involved during hair drying.
(b) State the changes in the movement of water particles when hair is dried.
Answer:
(a) Evaporation
(b) Water molecules more freely and faster
Lily dries her hair with a hair dryer.
(a) Name the process involved during hair drying.
(b) State the changes in the movement of water particles when hair is dried.
Answer:
(a) Evaporation
(b) Water molecules more freely and faster
Question 3:
Lauric acid, C12H24O2 is heated from room temperature to 50 °C. At 43 °C, lauric acid, C12H24O2 starts to melt.
(a) Draw a heating curve for lauric acid, C12H24O2.
(b) Why is the temperature constant at 43 °C?
Answer:
(a)
(b) Heat energy that is absorbed by the lauric acid particles, C12H24O2 is used to overcome attraction force between the particles until the solid changes to liquid.
Lauric acid, C12H24O2 is heated from room temperature to 50 °C. At 43 °C, lauric acid, C12H24O2 starts to melt.
(a) Draw a heating curve for lauric acid, C12H24O2.
(b) Why is the temperature constant at 43 °C?
Answer:
(a)
(b) Heat energy that is absorbed by the lauric acid particles, C12H24O2 is used to overcome attraction force between the particles until the solid changes to liquid.
