Ways to Bring About Changes
Ways to Bring About Changes: Overview
This topic covers concepts, such as, Contraction as a Change, Evaporation as a Change, Expansion as a Change, Melting as a Change, Diffusion as a Change & Combustion as a Change etc.
Important Questions on Ways to Bring About Changes
_____is the process of movement of molecules under a concentration gradient.
Small dust particles or smoke_____ into the air and cause air pollution.
Diffusion is an important process occurring in all living beings.
Diffusion is a physical change or chemical change. Explain.
Figure out the jumbled word using the clue given.
TEML
Clue: Out in the sun, ice will _____
Look at the picture carefully and answer the following questions.
The process by which A changes into B.
Fill in the box with words from the box:
| melts | hardens | evaporates | stretches | dissolves |
Water _____ on heating.
Define the following term
Burning.
Pick the change that can be reversed from the following.
Salt can be separated from its solution (salt dissolved in water) because
Identify the process involved.
As shown in the picture, fix a metallic ring to a stand so that a bob can just pass through it. Take a pendulum of an iron bob and try to pass it through the ring.
Did the bob pass through the ring?
Now heat the iron bob, and pass it through the ring. Did it pass through? Why?
Take a small glass bottle filled with coloured water upto half of its volume, and close it with a single holed cork, as shown in the picture. Insert a thin transparent tube inside the bottle.
Now roll the glass bottle between your palms as shown in the picture. Observe the water level in the tube.
What is the change that has taken place inside the bottle due to rubbing by palms? Why?
Place an ice cube on a plate for 10 minutes. What did you notice? Is there any change in the ice cube?
Write the state of the matter in the following situation.
Vapour on cooling.
Write the state of matter in the following situation.
Water on heating
Write the state of matter in the following situation.
Ice cubes on heating.
Given are three states of matter: solid, liquid and gas. Which coloured ticket do particles need to travel from one state to another: blue (cooling) or red (heating)?
What is expansion? How is the principle of expansion used in a thermometer for measuring temperature?
