How many moles are in 42.9 g of Fe2O4

What is the mass, in grams, of a sample of 6.98 * 10^24 atoms of magnesium (Mg) ?

An atom has 2 protons in its nucleus. Which of the following must be true for this atom to have no net electrical charge? Question 2 options: A. The atom has 2 negatively charged electrons outside the nucleus. B.

Polyatomic ion that is the conjugate acid of ammonia

How much time does it take for light from the center of the galaxy to reach Earth?

What kind of element forms covalent bonds? Give two reasons why.

Four properties of water are listed. 1. It is colorless and odorless in its pure form. 2. It reacts with metals to form metal hydroxide and hydrogen gas. 3. When heated to 100 °C, water evaporates. 4. It decomposes to form hydrogen and oxygen.

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element