Which of the following units can used to describe the rate of a chemical reaction?

○ (mol·L)/min

○ (mol/L)/min

○ 1/(mol·L·min)

○ none of these

The rate of a reaction can be expressed as the molarity (or concentration) of the reaction that reacts per unit of time, which can be any unit of time, but is commonly seconds or minutes.  Recall that molarity is moles/ volume, and that volume is often in units of liters and mililiters.  Given that reaction rate is M/time, and M is mol/L, the correct answer is (mol/L)/min.

(mol/L)/min

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms