How many moles of MgCl2 are there in 301 g of the compound?

Which of the following reactions is incorrectly labeled? a. HCl (aq) + NaOH (aq) = NaCl (aq) + H2O (l) - Precipitation reaction. b. CH4 (g) + 3 O2 (g) = CO2 (g) + 2 H2O (l) - Combustion reaction. c. No right choice.

In the reaction N2 + 3H2 - 2NH3, how many grams of H, are needed to produce exactly I mole of ammonia? A. lg B. 2g C. 3g D. 4g

in this lesson you learned that absolute time is time mesured in definite periods such as minutes days, and years, lest two ways of recording or meauring absolute time.

A solution can be both a. Dilute and concentrated b. Saturated and dilute c. Saturated and unsaturated d. Supersaturated and saturated e. None of these

What two things must occur in order for a light Ray to refract when it strikes the boundary of a different medium?

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)