How many atoms are in a sample of 72.8 grams calcium?

A student performs the following procedure: Procedure 1. Measure 25 grams of an unknown solid. 2. Measure 200 grams of water. 3. Pour the unknown solid and water into beaker, which weighs 50 grams. 4. Stir the solution.

What is the concentration of H + ions at a pH = 2? What is the concentration of OH - ions at a pH = 2? What is the ratio of H + ions to OH - ions at a pH = 2?

If you mixed chlorine, lithium and nickel together which two elements would be the most reactive?

Why is the structure of a molecule important to its function

Identify the reactants in the reaction hcl + naoh nacl + h2o.

8H2 + S8->8H2S Based on the mole ratios, what can most likely be predicted?

What do parent and daughter cells have in common? Check all that apply. There is one parent cell and one daughter cell. There are two parent cells and two daughter cells. They contain copies of the same cellular components.

If a liquid is heated, which of the following happens to both its energy content and the speed of its particles? A. The energy remains the same; the speed increases. B. The energy remains the same; speed remains the same. C.

An atom of magnesium has an atomic number of 12 and a mass number of 24. how many neutrons are in the neclues

What are oxides in chemistry