How many moles of hydrogen gas, H2, will be produced when 30.0 g of Magnesium react with excess Hydrochloric acid, HCl? 1 Mg + 2 HCl → 1 MgCl2 + 1 H2

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1: