I have a chemistry project where I need to make an object move using my knowledge of chemistry. The object os a small ball the size of a large marble. It must be moved using chemistry and NOT physics (ie slope wind etc).

I am 15 and in grade 11.

That sounds like an interesting chemistry project! Moving an object using chemistry can be achieved by creating a chemical reaction that produces a gas, which provides the necessary force to move the ball. Here's a step-by-step guide on how you can accomplish this:

Materials you will need:
1. Small ball (large marble)
2. Chemicals for the reaction
3. Container or platform to hold the reaction
4. Safety goggles and gloves
5. Measuring spoons

Procedure:
1. Choose a chemical reaction that produces a gas when it occurs. Examples of such reactions include the reaction between baking soda (sodium bicarbonate) and vinegar (acetic acid), which generates carbon dioxide gas.
2. Make sure you have a container or platform that can hold the reaction and safely direct the gas's force to move the ball. For instance, you can use a small open container or a tube aimed at the ball.
3. Calculate the appropriate quantities of the reactants based on the balanced chemical equation for the reaction. An example equation for the baking soda and vinegar reaction is:

NaHCO3 + CH3COOH -> CO2 + H2O + NaCH3COO

4. Prepare the reaction by measuring the correct amounts of the reactants and combining them in the container or platform. Take necessary safety precautions, such as wearing goggles and gloves.
5. Quickly place the ball in a position where the force of the gas will cause it to move. For example, you can position the ball at the top of a slope so that the gas will push it downhill.
6. Initiate the reaction by adding the reactants together, either by mixing them or adding one to the other.
7. Observe and record the motion of the ball as the gas is produced. You can measure the distance the ball travels or the time it takes to reach a certain point.

Remember to always prioritize safety while conducting chemical experiments. Consult with your teacher or an adult supervisor to ensure you choose appropriate and safe chemicals and follow proper safety procedures.