1. Approximately how long does the

Lunar Cycle fake to complefe all

phases of the moon one time?

A person's physical characteristics are determined by their a. environment b. hopes and wishes c. genes d. cells

Calculate the number of grams of silane gas, SiH4, formed when 34.9 g of Mg2Si reacts with excess H2O.

A 10 gram sample of material, a, was placed in water. four grams of it, b, did not dissolve, even after being separated and placed in a second volume of water. bcould not be decomposed into any simpler substances.

Solids tend to be dense and difficult to?

The combining of hydrogen and oxygen gas into liquid water is an example of what kind of change? phase chemical physical

What is the molarity of a solution that contains 612 grams of CaCl2 in 3.04 liters of solution? 1.81 M 201 M 5.52 M

What is the empirical formula for naphthalene

Explain why a piece of aluminum or magnesium can be used to remove tarnish, which is mostly silver sulfide, on silverware.

Why is it important for an engineer who is designing a new home-cooling/heating system to have knowledge about the transfer of heat?

Ammonia and oxygen react to form nitrogen monoxide and water, like this: 4NH3 (g) + 5O2 (g) → 4NO (g) + 6H2O (g) Also, a chemist finds that at a certain temperature the equilibrium mixture of ammonia, oxygen, nitrogen monoxide, and water has the