Question

ACTIVITY 1
1. Take two glasses and half fill them with cold water.
2. Transfer the contents of one glass into a narrow vessel and heat it on a flame
3. Drop a few iron nails in the boiling water and leave it for some time,
4. Ask an adult to use the pair of tongs to pick up the iron nails and drop it in the
beaker having cold water,
5. Dip your finger in the glass having the iron nail.
You will observe that the water of the glass having the iron nail feels warm. Hence, the
heat energy flows from the body placed at higher temperature (iron nail) to the body
placed at the lower temperature (cold water).
Chapter-4 > Heat and Temperature​

Answer 1

Answer:

I do this activity

Explanation:

it it is very good activity

Answer 2

Answer:

Take a 100 mL beaker.

Fill half the beaker with water and mark the level of water.

Dissolve some salt/ sugar with the help of a glass rod.

Observe any change in water level.

What do you think has happened to the salt?

Where does it disappear?

Does the level of water change?

In order to answer these questions we need to use the idea that matter is made up of particles. What was there in the spoon, salt or sugar, has now spread throughout water. This is illustrated in Fig. 1.1.

NCERT Class IX Science Chapter 1 Matter in Our Surroundings

Explanation:mark brainliest