Name the three carbon molecule that is formed due to the break-down of glucose during respiration.

Illustrate with an example that physical and chemical changes can take place together?

A solution contains 40 ml of ethanol mixed with 100 ml of water. Calculate the concentration regarding volume by volume percentage of the solution.

Define a chemical reaction. Which observations help you to determine whether a chemical reaction has taken place?

When Solid mercury (II)oxide is heated liquid mercury, and oxygen gas are produced. Balance the Equation.