What element (s) must be present in a molecule for it to be considered an organic molecule?

There is more energy after a chemical reaction than before the reaction. true or false

Calculate the average molarity of acetic acid in the vinegar using the data provided

A 2.144-g sample of phosgene, a compound used as a chemical warfare agent during World War I, contains 0.260 g of carbon, 0.347 g of oxygen, and 1.537 g of chlorine. What is the empirical formula of this substance?

How many moles of NaCl are in 75.0 g of NaCl?

The excited state electron configuration of carbon is 1s22s12p3. Explain what will happen as the carbon atom returns to its ground state, and write the ground state electron configuration.

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.