A 1.20 gram sample of a hydrated salt is heated to a constant mass of. 80 gram. what is the percent of mass of water contained in the original sample

Properties of a longitudinal wave

Lewis structure for hydrogen

The metal is observed to begin to melt when the temperature of its container is approximately 29°C. The metal is most likely

Which statement best describes how a new human trait develops and can be passed on to future generations? A) A mutation in a stomach cell results in the inability of a woman to produce a certain digestive enzyme.

interactions between substances can produce chemical or physical changes which of the following describes a chemical change

Calculate the percent yield when 500 grams of carbon dioxide react with an excess of water to produce 640 grams of carbonic acid. CO2 + H2O - --> H2CO3

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)