Why is hydrogen a light gas and iron is a heavy solid

How would you properly measure the mass of a liquid

When dissolved in water, hydrogen bromide (hbr) forms hydrobromic acid. determine the hydroxide ion concentration in a 4,500 ml solution containing 3.78 g hydrogen bromide; kw = 1.00 * 10¯14?

A house cat with a mass of 3.0 kg runs at a constant rate of 4.0 m/s in a straight line. What is the momentum of the cat?

If 4 moles of gas are added to a container that already holds one mole of

What type of muscle is found in your digestive system

Describe your observations of the original solutions. Describe your observations when the silver nitrate was added to the sodium chloride solution.

A gas occupies 18.5L at stp. what volume will it occupy at 735 torr and 57°c?

When two elements form two different compounds, the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.

Which best identifies why the rusting of an iron nail in the presence of water and oxygen is in oxidation-reduction reaction

In the laboratory hydrogen gas is usually made by the following reaction:Zn (s) + 2HCl (aq) = H2 (g) + ZnCl2 (aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mmHg and a temperture of 21 Co, can made from 3.