What 2 particles account for almost all if the mass of an atom

What information can you determine from the coefficients in this balanced chemical equation? Mg + 2HCl → MgCl2 + H2

If and electron is heated or electrified, it will give off light energy as it moves from a lower to a higher electron energy level. True or False

You have obtained a gas chromatogram of a two component mixture of compounds A and B. The height of peak A is 3.96 cm. and the width at half height is 1.25 cm. The height of peak B is 4 cm. and the width at half height is 1.17 cm.

What volume of a 4.5 m solution of phosphate is necessary to create a 80.0 ml stock of 2.0 m phosphate solution?

Magnesium has a charge of + 2, and chlorine has a charge of - 1. To form a chemical bond, the compound would have magnesium ion (s).

Write the expression for the equilibrium constant for the reaction represented by the equation CaCO3 (s) ⇌ Ca2 + (aq) + CO3 - (aq). Is Kc > 1, < 1, or ≈ 1? Explain your answer.

Assuming that pressure and temperature are constant, how many liters of oxygen gas will be required to produce 0.160 L of nitrogen gas. 4 NH3 (g) + 3 O2 (g) → 6 H2O (g) + 2 N2 (g)

Aluminum flouride + sulfuric acid=

As glucose is oxidized, how many times do the Krebs (citric acid) cycle turn, and how much NADH, FADH2 and ATP is produced during this process?

The following table shows the period of revolution of some unknown planets of equal mass. Period of RevolutionPlanet Period of Revolution W 1.9 years X 11.