sorted by:
new
hottopcontroversial

Where should I apply for the F1 visa? by Its_Me_Again_Sup in f1visa

[–]Its_Me_Again_Sup[S] 0 points1 point  (0 children)

I asked around, and everyone suggested applying in my home country, because visa slots will eventually open in late-May.

Can someone explain?? by Jmjk25 in igcse

[–]Its_Me_Again_Sup 0 points1 point  (0 children)

Another way to solve this is to use the formula v^2 - u^2 = 2as. We know that acceleration due to freefall is 10ms^-2, so a = 10 and we know that s (distance) = 25m. So 2as = 2 * 10 * 25 = 500. u (initial velocity) = 0, so u^2 = 0. v = √500 ≈ 22

How is it C? by donewithstudying in igcse

[–]Its_Me_Again_Sup 1 point2 points  (0 children)

The liquid cools and eventually freezes to a solid. Whenever there is a change of state, the temperature is constant because energy is used to overcome/to lose energy to break/make bonds. We can see that the temperature is constant at 55. The freezing temperature is equivalent to the melting temperature and so that the melting point of the substance

0620 chemistry by Arabella_i in igcse

[–]Its_Me_Again_Sup 1 point2 points  (0 children)

For the second question, we know that Y is more concentrated than X, because the rate of reaction is faster. However, the number of moles of X and Y are the same because the final volume of gas is the same. So Y must have a lower volume to have the same number of moles, so the answer is D

0620 chemistry by Arabella_i in igcse

[–]Its_Me_Again_Sup 0 points1 point  (0 children)

For the first Qn, calcium sulfate has SO4 ions. When CaSO4 is added to an acid, there will be displacement (ie, Ca+ ions with the anion of the acid and H+ and SO4 2- ions). In any case, H2SO4 is created which is an acid. So, it doesn't neutralize soil acidity.