1.The chemical equation for the production of salt (NaCl) from its two ions is Na+ + Cl- <-> NaCl.

What amount (in grams) of sodium chloride would you need to make a solution of concentration 2M in half a liter of water?

2. How many electrons can Helium and Hydrogen lose or gain?

3.which one is a polysaccharide?

a. phosphatidic acid b. sucrose c. phenyl d. alanine

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