Question

please answer my questions​

Answer 1

Answer:

Here is ur answer....

Explanation:

a)

b) F=600 N

A=20m^2

P=F/A i.e

P=600/20

P=30 Pa(pascal)

c) A dam has broader walls at the bottom than at the top to withstand the great pressure of water which increases with increase in depth.

Activity Based:-

a) The colour of the flame is dazzling white.

b) 2Mg + O2 - 2MgO

MgO + H2 - Mg(OH)2

c) The solution formed is magnesium hydroxide.

d) When blue litmus paper is dipped in solution it doesn't show any change but when red litmus paper is dipped in the solution it turns blue.

e) This experiment shows that magnesium hydroxide is a base. Magnesium oxide is a new substance formed on burning of magnesium. Magnesium hydroxide is another new substance formed by mixing magnesium oxide with water. Hence it is a chemical change.

I HOPE IT HELPS....