PLEASE HELP! 1) What type of reaction is this?
CaCO3 > CaO + CO2
2) Balance the equation (Hint, you need to balance the left side with the right side)

Asolution at 25 degrees celsius is 1.0 × 10–5 m h3o+. what is the concentration of oh– in this solution?

Mrs. smith ordered a root beer float (vanilla ice cream + root beer). mrs. smith noticed that the three states of matter (solid, liquid, and gas) all existed simultaneously in her root beer float. a. identify each phase of matter in the root beer float. b. describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? ) c. identify one phase change you would see in a root beer float and described what causes this change.

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million