Select the equations that are correctly balanced.

H2O + 2O2 → H2O2

Fe2O3 + 3H2 → 2Fe + 3H2O

Al + 3Br2 → AlBr3

CaCO3 → CaO + CO2

Explain why automobile owners in severe northern climates often add air to their tires in the wintertime and release some air from the same tires in the summertime

What is the nomenclature of wood?

Consider these atoms. which atom (ba or i) would accept electrons from the other atom to satisfy the octet rule?

As atoms gain energy, they move faster and slide past one another more easily. Atoms at the surface of the substance overcome attractions to nearby atoms and break free of the surface Which change of state is taking place?

What role does sea water play in the water cycle?

For an atom's electrons, how many energy sublevels are present in the principal energy level n = 4?

Attempt 2 A sample of gas contains 49.16 % N 2 gas, 19.85 % Br 2 gas, 9.95 % CO 2 gas, and 21.04 % of an unknown gas. The average atomic mass of the gas mixture is 50.71 u. Calculate the atomic mass of the unknown gas.

A chemist determined by measurements that. 040 moles of gold participated in a chemical reaction. calculate the mass of gold that participated in the chemical reaction. round your answer to significant digits.

10) A screwdriver has the density of 5.5 grams per cubic centimeter. It also has the mass of 2.3 grams. What is the screwdriver's volume?

A chemist weighed out 20.7 g of sodium. Calculate the number of moles of sodium she weighed out