Why could I do for a science fair

Describe the limitations of using models to represent atoms

At 325 k, the pressure inside a gas-filled container is 467 kpa. If the pressure inside decreases to 233 kpa, but the volume remains the same, what is the final temperature of the gas?

The recommended daily allowance (rda of calcium is 1.2 g. calcium carbonate contains 12.0% calcium by mass. how many grams of calcium carbonate are needed to provide the rda of calcium?

Samples of each of the following objects are removed from a 60º C water bath, in which they have been for enough time to reach this temperature, and placed into 200 grams of water at room temperature. Each sample has a mass of 50 grams.

A reaction mixture contains 0.107 atmatm of H2H2, 0.056 atmatm of S2S2, and 0.572 atmatm of H2SH2S. Determine how these conditions compare to equilibrium conditions.

How much greater is the energy produced by a fusion reaction compared to a chemical reaction?

True or false. A bond between a metal atom and a nonmetal atom is likely an iconic bond

What is a precipitate? It is a liquid that forms from solution during a chemical reaction. It is a reactant that forms from solution during a chemical reaction. It is a solid that forms from solution during a chemical reaction.

The electron configuration for an atom is 1s22s22p2. How many electrons does the atom have? 4 2 6 5

When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the solution turns milky and a white precipitate Y is formed a. Write the chemical formula of X, Y and (3) b.