Which of the following happens to an acid when it reacts with another substance?

it receives a hydrogen ion.
it receives a hydroxide ion.
it donates a hydroxide ion.
it donates a hydrogen ion.

The reaction q+r2=r2q is found to be first order in r2 and

What is the relation between concentration of reactants and the rate of chemical reaction?

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?