7.

An exothermic reaction (gives off) (takes in) heat.

8.

An endothermic reaction ______________heat.

9. A reaction is in equilibrium if the reactants are being formed from the

___________ at the same rate as the products are being formed from the

_______________. The symbol used to indicate that a reaction may go in both

directions is ________________________.

10.

The formula weight of a compound is also known as its ________________

weight. If the molecular weight is expressed in milligrams, it is known as the

_____________ molecular weight. If it is expressed in grams, it is known as the

_______________ molecular weight. The formula weight of carbon dioxide is

12 + 16 + 16 = 44. The milligram formula weight of carbon dioxide is ______.

The gram formula weight of carbon dioxide is __________.

11. The milligram molecular weight of a compound is the sum of the a________

w_______s of all the atoms that appear in its chemical formula, with the weights

expressed in ________________.

12. Using Table 1-1 in this subcourse and rounding the atomic weights to the nearest

whole number, what is the milligram molecular weight of sodium bicarbonate,

NaHCO3?

Atoms:

Na + H + C + O + O + O

Atomic weights: __+ __+ __+ __+

+ __

Adding the atomic weights, we get a formula weight of __________.

Thus, the milligram molecular weight is _____________.

The gram milecular weight is _____________________.

13. A mole of NaHCO3 weighs _______ grams. A liter of a 1M solution of NaHCO3

contains ________grams of NaHCO3.

14. The milligram equivalent weight of a compound is its milligram molecular weight

divided by the total ____________ or _______________v ___________.

MD0803

2-29

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