Sikkim SCERT Class 5 EVS Chapter 10 Experiments with Water Solution
Sikkim SCERT Class 5 EVS Chapter 10 Experiments with Water Solution by expert teacher. We have covered all questions and answers.
Board |
Sikkim SCERT |
Class |
5 (V) |
Chapter |
Experiments with Water |
Page –120
- Ayesha put a puffed puri in a bowl of water. Would it sink or float?
Answer –It would float.
- You put a steel plate on water. Would it sink or float? What would happen to a spoon?
Answer –If I put a steel plate on water it would float.
Incase of spoon it would sink to the bottom.
- Would the cap of a plastic bottle sink or float on water?
Answer – A cap of a plastic bottle would float on water.
Page –122
Things to be put in water | I guessed, before I did it | I saw, when I did it |
Empty bowl (katori)
After putting in 6-7 small pebbles, one-by-one |
✔️
❌ |
|
Iron nail or pin | ❌ | |
Matchstick | ✔️ | |
Emptyplastic bottle with its lid closed
Bottle half-filled with water Bottle full of water |
✔️
❌ |
✔️ |
Aluminium foil (from medicine packing)
open and spread out pressed tightlyinto a ball in a cup-like shape |
✔️
❌ ✔️ |
|
Soap cake
Soap cake on a small plastic Plate |
❌
✔️ |
|
A piece of ice | ✔️ |
Page –123
a) Find out from the other groups which things floated and which sanked in the water.
b) After doing the experiment, fill in the blanks.
1.) The iron nailsinksin water but the katori. I think this happened because katori’s weight is less than the water displaced by it and also it has less density while iron nail has higher density.
2.) The empty plastic bottle floats on water. The bottle filled with water sinks because the empty bottle has air in this which keeps it afloat while bottle filled with water doesn’t have any air in it so it sinks
3.) The Aluminium foil floats when it was spread out. When pressed tightly into a ball it This may have happened because when we make it a ball it gets density
- Take some water in a glass. Put a lemon in it. Now keep putting salt in the water, half-a-spoon at a time. Were you able to float your lemon in water?
Answer –Yes, I was able to float the lemon in water.
- What do you think, the lemon floated in salty water,
because …
Answer – It is because when we add salt to the water, the water gains weight and becomes denser. So lemon becomes light weighted compared to water.
Page – 125
Things | Did it dissolve or not? | What happened after keeping for 2 minutes? |
a. Salt | No | Yes |
b. Soil | No | Yes |
c. Chalk powder | No | No |
d. 1 spoon milk | Yes | Yes |
e. Oil | No | No |
- Could you see the salt after it dissolved in water? If no, why?
Answer – No, I can’t see the salt after it dissolved in water. It is because when it gets dissolved it mixes with water and becomes transparent as water.
- Does that mean that now the water does not have salt? If it has, then where is the salt?
Answer – No, water does have salt in it. The salt is dissolved in water and we can observe it when we taste it.
- What difference did you see – in the water with salt, and the water with chalk powder – after keeping for sometime?
Answer –After keeping for some time, the salt is completely dissolved in water but chalk powder sediments at the bottom and doesn’t dissolve.
- Which of the two would you be able to separate from the water by straining with a cloth – salt or chalk powder?
Answer –I can separate the chalk powder from water by straining with a cloth.
Page –126
- Do you think the oil got dissolved in the water? Why do you think so?
Answer –No, I don’t think the oil got dissolved in the water. Because water and oil are two insoluble things.
- You also try to do the same and then tell – which drop went ahead? Why did it slide faster?
Answer – The water drop went ahead. It slide faster because the has lower viscosity than sugar water.
- Where did the water go?
Answer – The got evaporated and became vapor.
- At your house, what things are made by drying in the sun?
Answer – In my house pickles are made by drying in the Sun.