(Answers to odd-numbered Conceptual Questions

Introductory Chemistry 5
Determine the mass (in g) of each NaCl solution that contains 1.5 g of NaCl. (a) 0.058% NaCl by mass (b) 1.46% NaCl by mass (c) 8.44% NaCl by mass

Physics: Principles with Applications 7
Problem 1COQ Two identical tiny spheres have the same electric charge. If their separation is doubled, the force each exerts on the other will be (a) half. (b) double. (c) four times larger. (d) one-quarter as large. (e) unchanged.

Myers' Psychology for AP 2
Neural networks grow more complex by a. branching outward to form multiple connections. b. keeping the nervous system immature. c. controlling one another with a restricted response system. d. limiting connections. e. associating behaviors that would not normally be associated together.

Chemistry: A Molecular Approach 3
Why is vaporization endothermic? Why is condensation exothermic?

Psychology 12
What three issues have engaged developmental psychologists?

Principles of Economics 9
If the government wants to expand aggregate demand, it can _________ government purchases or _________ taxes. a. increase; increase b. increase; decrease c. decrease; increase d. decrease; decrease

Chemistry for today : general, organic, and biochemistry 9
An archaeologist sometime in the future analyzes the iron used in an old building. The iron contains tiny amounts of nickel-63, with a half-life of 92 years. On the basis of the amount of nickel-63 and its decay products found, it is estimated that about 0.78% (1/128) of the original nickel-63 remain