The atomic mass unit (amu) is

a. the mass of a single atom of carbon

b. one millionth of a gram

c. approximately the mass of a proton

d. approximately the mass of an electron

When a nucleus has too many protons it can be absorb an electron and create

Which list of symbols represents nonmetals, only? (1) B, Al, Ga (2) Li, Be, B (3) C, Si, Ge (4) P, S, Cl

What is the stable ion of tellurium

Which of the following is an electrolyte? a. sodium chloride c. water b. sugar d. glass

Oxygen has an atomic number of 8. in order to fill its outer electron shell, how many electrons does it need?

Which is the balanced chemical equation showing hydrogen peroxide (h2o2) decomposing into hydrogen (h2) and oxygen (o2) ? 1. h2 + o2 → h2o2 2. 2 h2o2 → 2 h2 + o2 3. h2o2 → h2 + o2 4. 2 h2 + o2 → 2 h2o2?

Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B.

Zircon is a mineral with the empirical formula ZrSiO4. If all the zirconium is 90Zr, all the silicon is 28Si, and all the oxygen is 16O, what mass of oxygen is present in 10. g of zircon?

Which property below is not a general property of metals: A. Ductile C. Malleable B. Poor conductor of heat D. High luster

Calculate the number of particles (atoms or molecules) of the following: 1. How many molecules are there in 24 grams of FeF3? 2. How many molecules are there in 450 grams of Na2SO4? 3. How many grams are there in 2.3 x 1024 atoms of silver?