Combien de moles correspondent à 36g d'eau

A substance did not change its chemical nature in a reaction. Which most likely describes the reaction? A) It was heated. B) It was hit with a hammer. C) It was placed in a salt solution. D) It was frozen.

What is special about waters density when it is a solid?

if you have the chemical formula of a substance what can you figure out about its properties? explain, use the compound water h2o is an example

A gas occupies a volume of 458 mL at a pressure of 1.0 1K PA and temperature of 295K. when the pressure is changed the volume becomes 500 mL. if there has been no change in temperature what is the new pressure?

Which of the following is the best conductor of electricity

Which of the following is a possible equivalence that can be used in a conversion? A. ten to the negative second power hL over one L B. ten to the negative second power cL over one L C. ten to the first power L over one daL D.

Which process is a chemical change? burning a match boiling water melting ice breaking glass

What form of matter is "vapor"? a. a solid made of a substance that is usually liquid c. a gas made of a substance that is usually solid b. a liquid made of a substance that is usually gas d. a gas made of a substance that is usually liquid

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)

End-users of natural gas include (check all that apply) :