1 mole ch4 molecules, 1 mole sf2 molecules, 1 mole n2o molecules, or all of the selctions are equal which has more molecules?

The process of evaporation describes which of the following changes of state? solid ➡ liquid gas ➡ solid liquid ➡ gas solid ➡ gas

Which of the following elements would be expected to resemble germanium (Ge) most closely in chemical properties? 1. Cu 2. Zn 3. Sn 4. Na 5. Ga

Involves both an experimental group and a control group, which are alike except for the one variable that the experiment is designed to test.

Which of the following is an example of a baryon? a. meson c. lepton b. electron d. proton

Which best describes what occurs when an object takes in a wave as the wave hits it? transmission absorption reflection refraction

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)