Question
Image
These students are describing some changes. What kinds of changes are they talking about?

Answer

1. Ice melts and becomes water. This is physical change as only state of water from solid to liquid has changed in this process.
2. Bud blossoms to a flower, this is a chemical change as once a bud blooms into a flower, it cannot revert back to its bud form. Also, internal chemical changes takes place.
3. Cold water becomes warm on keeping in open, this is a physical change as water remains the same, only its temperature changes.
4. Rotting of banana is a chemical change as its composition and texture get changed.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Read the passage and answer the questions :
Keerthi tested various substances with red rose extract.
Q.1. Red rose extract turns green with:
(a) Vinegar$\quad$(b) Baking soda
(c) Lemon juice$\quad$(d) Sugar
Q.2. Which of the following would turn it red?
(a) Lime water$\quad$(b) Soap
(c) Amla juice$\quad$(d) Baking soda
Q.3. A solution that does not affect colour is:
(a) Vinegar$\quad$(b) Lime water
(c) Baking soda$\quad$(d) Soap
Read the passage and answer the questions :
Riya observes that in her village, people place hay on roofs during summer.
Q.1. Why is hay used?
(a) It looks nice
(b) It reflects heat
(c) It acts as an insulator
(d) It traps water
Q.2. What property of hay helps keep the house cool?
(a) Good conduction$\quad$(b) Radiant properties
(c) Air trapping ability$\quad$(d) High reflectivity
Q.3. Which method of heat transfer is being reduced here?
(a) Radiation$\quad$(b) Conduction
(c) Convection$\quad$(d) Absorption
Outline your role as an active citizen in relation to sanitation.
What unusual qualities of wool make it a very useful fibre?
Why is it difficult to predict the weather of a place, while it is easy to predict its climate?
Answer the following:
(i) Draw a schematic diagram showing photosynthesis.
(ii) What are the products of photosynthesis?
(iii) Name the gases utilised and liberated in photosynthesis.
(iv) Can all plants do photosynthesis?
Three test tubes A, B and C are taken as shown in figure below. Red litmus paper was dipped in all three test tubes to test which solution is basic in nature. Identify in which test tube the red litmus paper will change its colour to blue?
Image
Distinguish between the following. Xylem and Phloem.
How would you show that setting of curd is a chemical change?
Neha went to the market with her mother to buy a silk saree for her grandmother. The shopkeeper was showing sarees of different varieties of silk but her mother wanted to take only a pure silk saree and not an artificial one. Neha was confused that how to distinguish between a pure silk and an artificial silk saree. But her mother helped her in selecting a pure silk saree for her grandmother and she was quite elated about that.
Now, answer the following Questions:
  1. How her mother distinguished between pure silk saree and an artificial silk saree?
  2. Is the pure silk saree more costly than an artificial one?
  3. What values are shown by Neha’s mother?