Answer:
Changing the surface area from minimum to maximum increases the number of reactants in a chemical reaction.
An increase in surface area of a solid reactant means more of its particles are exposed to attack by the other Particle. This results in an increased chance of collisions between reactant particles, so there are more collisions in any given time and the rate of reaction increases.
<span>A chain reaction keeps going on its own once started</span>
<span>16.04 g of carbon tetrahydride (CH4) and </span><span>12.01 g carbon (C)</span>
Answer: Precipitates form only in (b) (c) and (d) and these are 
, 
and NiS respectively.
Explanation: (a) The reaction will be:
The reaction will not take place as both the products are soluble and so no precipitate will form.
(b) The reaction will be:
This reaction will take place as aluminum hydroxide is insoluble. So, the precipitate formed in this reaction is .
(c) The reaction will be:
This reaction will take place as a precipitate of calcium sulfate(slightly soluble) will form.
(d) The reaction will be:
This reaction will take place as NiS is insoluble. So, the precipitate formed in this reaction is NiS.
<span>The DNA or deoxyribonucleic acid is composed of a pentose sugar,
a base and phosphate group. The bases are adenine, thymine, cytosine and
guanine. Guanine always forms hydrogen bonds with cytosine. Remember the
statement “Apples in the Tree, Cars in the Garage”. The A stands for adenine
and pairs with T-thymine then C – cytosine and G – guanine. </span>
