Question

) A solution has 50g of salt in 320g of water. Calculate the mass percent of the salt in the

solution.

ii) Name any one Metalloid.

iii) What type of change is cutting of wood.

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Answer 1

Answer:

2)- silicon

3)- the burning of wood lead to the formation of new substance like ash (carbon),carbon dioxide gas, water vapour, heat and light. This changes is irreversible and hence a chemical change. while cutting wood into smaller pieces is a physical change in the original composition of wood