1 (a) Melting of wax during burning of a candle is a physical change. (b) Burning of wax and thread is a chemical change. 2. The use of LPG also involves two changes: (a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change. (b) The burning of LPG is a chemical change bRead more
1 (a) Melting of wax during burning of a candle is a physical change.
(b) Burning of wax and thread is a chemical change.
2. The use of LPG also involves two changes:
(a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change.
(b) The burning of LPG is a chemical change because the gas on burning produces carbon dioxide gas and gives light and heat
Which of the given metal is stored under kerosene to prevent oxidation?
[A] potassium
[A] potassium
See lessDuring electrolytic refining of zinc, it gets
[A] Deposited on cathode
[A] Deposited on cathode
See lessBlue litmus paper is dipped in a solution. It remains blue. What is the nature of solution? Explain.
The solution is either alkaline (or basic) or neutral. Because, blue litmus dos not change its colour in neutral or alkaline (basic) solution.
The solution is either alkaline (or basic) or neutral. Because, blue litmus dos not change its colour in neutral or alkaline (basic) solution.
See lessWhen a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
1 (a) Melting of wax during burning of a candle is a physical change. (b) Burning of wax and thread is a chemical change. 2. The use of LPG also involves two changes: (a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change. (b) The burning of LPG is a chemical change bRead more
1 (a) Melting of wax during burning of a candle is a physical change.
See less(b) Burning of wax and thread is a chemical change.
2. The use of LPG also involves two changes:
(a) When the valve is opened, the liquid LPG gets vaporised. This is a physical change.
(b) The burning of LPG is a chemical change because the gas on burning produces carbon dioxide gas and gives light and heat
What will happen if the copper sulphate solution you have prepared is not saturated?
Crystallization will not take place.
Crystallization will not take place.
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