What is the chemical name for the compound CuCO\(_{3}\)?

A 'breath test' used by traffic police to check drunken driving uses?

Which one of the following is not a mixture?

Which of the following is a non-metal that remains liquid at room temperature?

Which of the following are chemical changes? 

I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up