An observation that requires measurement is called quantitative observable or qualitative

3 Ca + 2 AICI3 + 3 CaCl2 + 2 AI If you react 100. grams of aluminum chloride with excess calcium, how many grams of calcium chloride are produced?

What isotope has 14 protons and 14 neutrons?

Which are always the first waves of an earthquake to be detected

Rainwater can have a ph as low as 3, meaning that it is very a. basic b. salty c. acidic d. neutral

What material will oxidize when it is exposed to oxygen and water? a stone b metal c plastic d plants

What is the volume of an object whose dimensions are 5.54 cm, 10.6 cm, and 199 cm? Round your answer to the correct number of significant figures. A. 117 cm3 B. 1.20 * 104 cm3 C. 1.17 * 104 cm3 D. 11686.076 cm3

What type of reaction is BaI^2+H^2SO^4 2H+BaSO^4

Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?

Consider the equilibrium system below. If the system is at dynamic equilibrium, which statement is true? a. Sublimation of the NH4CI crystals stops. b. Solidification of the NH4CI vapors stops. c.

What happens to the atomic radius as the atomic number increases down and why