Galaxies are composed of many different objects. What kind ok objects make up most of the visible matter in a galaxy?

The concentration of the alkane in a particular sample of rainwater is 0.2 ppb. assume that the density of rainwater is close to 1.00 g/ml and find the molar concentration of

Consider the balanced equation below. 4NH3 + 302 → 2N2 + 6H20 What is the mole ratio of NH3 to N2? A) 2:4 B) 4:2 C) 4:4 D) 7:2

In water, a strong acid will In water, a weak base will break down into its component parts. break down into its component parts.

If you started with 1000 units of a radioactive element that has a half-life of 2,500 years, how many half-lives will the material have gone through in 7500 years? (Show work and explain answer).

Salts as neutral, acidic, or basic.? identify the following salts as neutral, acidic, or basic. 2srbr2 4lif

What does the dashes line represent? A. Medium B. Boundary C. Normal D. Incident Ray

Only a small amount of cerium oxide nanoparticles is needed because the nanoparticles ... 1) are elements 2) are very reactive 3) have a high surface area to volume ration

Describe the solubility of water compared to ethanol?

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous Endothermic

The solubility of carbon dioxide gas in water can be increased by