Matter that has a uniform and definite composition is called?

The total pressure of a mixture of hydrogen, oxygen, and methane is 96.4 kPa. The partial pressures of hydrogen and oxygen are 13.5 kPa and 29.3 kPa respectively. What is the partial pressure of methane?

The products have more energy than the reactants ... does that describe an exothermic reaction?

A sample of ideal gas is in a sealed container. The pressure of the gas is 485 torr, and the temperature is 40 ∘C.

Balanced chemical for hydrochloride acid and sodium hydroxide

The average density of human blood is 1.06 g/mL. What is the mass of blood in an adult with a blood volume of 5.5L? Express your answer in (a) grams & (b) ounces.

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?