Question

fill in the blanks with the correct words.
1. A ____________ (physical/chemical) change is a permanent change.
2. The raddish brown layer deposited on the surface of iron object is called_____________ (rust/crystal).
3. Browning of vegetables is due to the reaction between certain compounds present in the vegetables and____________(oxygen/carbon dioxide).
4. when vinegar and baking soda are mixed together, bubbles are formed due to the evolution of_____________(oxygen/carbon dioxide).
5. copper sulphate is blue and acquires a_______________(yellow/sea-green) colour when iron filing are dropped into it.
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Answer 1

a) chemical.

b) rust.

c) oxygen.

d) carbon dioxide.

f) sea green.......

I hope this will helps you

Answer 2

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$\underline{\Huge\textsf{Answer:}}$

$\large{\implies{\boxed{\sf{\blue{}}}}}$ 1. Chemical change [Since the components can't be obtained back once it's changed]

2. Rust [ It is mostly formed on iron objects when the surface comes in contact with air or oxygen or moisture]

3. Oxygen [The Browning of food,also called enzymatic Browning occurs when the food is exposed to oxygen (oxidation of food)]

4. Carbon dioxide [Here is the reaction:- NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2. This is double displacement reaction.]

5. Sea - green colour. [ Here is the reaction:- Fe + CuSO4 → FeSO4 + Cu. This is displacement reaction.]

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