Chemical Reactions — Test Answers

Which type of reaction has the general formula of AB plus CD rightarrow AD plus CB ?

This formula equation is unbalanced. Pb open paren NO sub 3 close paren sub 2 aq plus Li sub 2 SO sub 4 aq rightarrow PbSO sub 4 times s plus LiNO sub 3 times aq Which coefficient should appear in front of LiNO sub 3 in the balanced equation?

Consider the chemical equation. 2 NBr sub 3 plus 3 NaOH rightarrow cap n sub 2 plus 3 NaBr plus 3 HOBr If there are 40 mol of NBr sub 3 and 48 mol of NaOH , what is the excess reactant?

The chemical equation for the formation of ammonia is unbalanced. 3 cap h sub 2 g plus cap n sub 2 times g rightarrow NH sub 3 times g If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed?

Which method would provide evidence to support the inference that this is an exothermic reaction?