During which phase change will two grams of water

release 668 joules of heat energy?

A. melting

B.

freezing

C.

vaporization

D. condensation

What is the concentration of nitrate ion in a 425 ml solution containing 32.0 g of Mg (NO3) 2 (M = 148.3)

What have you been observing the world with all of your life? senses specialized tools specialized equipment complex device

What starting matirials do cells need for cellular respiration

A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).

Pure gold has a density of 19.3 g/cm3.

Air is transferred from a 75 L tank where the pressure is 125 psi and the temperture is 288 k to a tire with a volume of 6.1 L and a pressure of 25 psi. What is the new temperture.

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.