Chemistry and Physics questions IMMEDIATE HELPWatch
Sulfuric acid can be reacted with potassium chloride to produce potassium sulfate, which is an important ingredient in some fertilizers. The Balanced equation below shows this reaction:
H2SO4 + 2KCl = K2SO4 + 2HCL
Calculate the mass of potassium chloride needed to produce 100g of potassium sulfate.
Relative Formula Masses (Mr): KCl = 74.5. K2SO4 = 174
3) The diesel fraction of crude oil contains C16H34 molecules.
These molecules are cracked for economic reasons.
Explain this statement. Include a balanced equation in your answer.
4) A coin is dropped from the top of a building. It falls 300m to the ground. Calculate the speed of the coin just before it hits the ground. State any assumptions you make. Give your answer to 3 significant figures.
Here’s a basic method for the first question. This does give the answer said above. Have a go and see what you get.
This is the information in the falling coin question presented in a way which should help. There are definitely assumptions made in saying that acceleration is 9.81 ms-2 and constant. There may be an assumption in saying that u is 0 ms-1.