Acid base titrations

For the chemical compound which is represented in vinegar together with water: What is the name and formula of this compound?

When copper metal reacts with concentrated nitric acid, SALT, WATER and GAS forms. What is the name of the gas?

iv got information about it but dont know how to lay it out

I really need to know all the fundamental facts about alkanes and alkenes - I have my exams in May!!!!

Is lemonade an acid or an alkali?