Chemistry Past Questions and Answers

If the value of ΔH is positive for a reaction, it means that the reaction is?

Which of the following compounds is formed by the oxidation of ethanol?

What is the name of the gas liberated when diluted hydrochloric acid is added to iron(ii)sulphide?

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?
[ H = 1.0. C = 12.0, O = 16.0 ]

When excess chlorine is mixed with ethane at room temperature, the product formed is?