Why is rust forming on a car a chemical change?

Energy released from cell respiration is know as

Methane gas, ch4, effuses through a barrier at a rate of 0.147 ml/minute. if an unknown gas effuses through the same barrier at a rate of 8.87e-2 ml/minute, what is the molar mass of the gas?

Calcium hydride reacts with water to form hydrogen gas and calcium hydroxide. How many grams of calcium hydride are needed to generate 53.5 liters of hydrogen gas if the pressure is 814 torr at 21*C.

Most reactive metal and nonmetal

What is the equation for the base ionization constant of PO4^3-

Using density what is the mass in grams of 150mL of a liquid with a density of 1.4 g/mL

All of the following can be recycled except clothing aluminum cans compact fluorescent bulbs plastic drink bottles

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.0 L of water upon warming from 25 ∘C to 50 ∘C.

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure.

When you light a fire place what energy transformation takes place