Question

Q1. Explain whether the followingare physical or chemical changes ?
1) Formation of cloud
2) Ripening of fruit
3) Bending a glass tube by heating
4) Melting of wax
5) Formation of wine


Q2. Action of heat on blue vitriol is a physical as well as chemical change justify .

Q3. Is boiling of water , a chemical change ? . Give reasons for your answer .

Q4. A person eats chocolate and then digests it . In doing so a physical and a chemical change takes place . Identify the changes and give reasons for your answer.

Q5. When we mix iron fillings with sulphur and grind it , a physical change takes place . However, if we heat the mixture , a chemical change takes place . Explain why the former is said to be a physical change while the latter process is said to be a chemical change.

Q6. Define the following terms :-
a) Thermal decomposition
b) Electrolytic decomposition


Q7. What type of reaction is this ? Why is it called so ?
NaOH (aq) + HCL (aq) ---- NaCl (aq) + H2O ( l ) ​

Answer 1

Answer:

i have given answer to Q1 and 3 just see the image