Question

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Answer 1

Answer:

1) the colour changes from blue to light green

2) a)

it is a physical change because u add energy

b)

physical change

3) it is an exothermic reaction because heat produced is distributed allover the body

4) when copper is exposed to air its colour changes green due to corrosion

5) because nitrogen gas does not oxidises the food and we can store the food for long days

6) because silver chloride decomposes silver and chlorine in the presence of light

7)Na2Co3 + 2 HCL-------- 2 NACL + H2CO3

8) Cao ( calcium oxide)

9) it's taste changes and become sour due to the breakdown of lactose into lactic acid

10) it forms slaked lime along with the heat

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