Chapter 2 Textbook Questions

Question 1

The reactivity of an atom arises from

Answer 1

The existence of unpaired electrons in the valence shell

Question 2

Which of the following statements correctly describes any chemical reaction that has reached equilibrium

Answer 2

The rates of the forward and reverse reactions are equal

Question 3

Many mammals control their body temp by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temp?

Answer 3

The absoprtion of heat by the breaking of hydrogen bonds

Question 4

We can be sure that a mole of table sugar and a mole of vitamin C are equal in their

Answer 4

Number of molecules

Question 5

Measurements show that the pH of a particular lake is 4.0 what is the hydrogen ion concentration of the late?

Answer 5

10^-4 M

Question 6

The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound

Answer 6

H\/2 S

Question 7

What coefficients must be placed in the following blanks so that all atoms are accounted for in the products?
C\/6 H\/12 O\/6 –> ____C\/2 H\/6 O + ____ CO\/2

Answer 7

2:2

Question 8

A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temp of the water?

Answer 8

10 C