In acetic acid vapor, some molecules exist as monomers and some as dimers (see Figure 12-9). If the density of the vapor at $350 \mathrm{~K}$ and $1 \mathrm{~atm}$ is $3.23 \mathrm{~g} / \mathrm{L}$, what percentage of the molecules must exist as dimers? Would you expect this percent to increase or decrease with temperature?

Decrease 210 by a ratio of 3 : 7.

Which change results in an increase in gas pressure in a balloon?

A) decrease in temperature

B) decrease in volume

C) increase in volume

D) increase in altitude

In a new highly automated factory, labor costs are expected to decrease at an annual rate of 5 percent; material costs will increase at an annual rate of 4 percent; overhead costs will increase at 8 percent. The labor, material, and overhead costs at the end of year 1 are $2 million,$3 million, and $1.6 million, respectively. The time value of money rate is 11 percent, and the time horizon is 7 years.

a. Determine the dollar value for each cost category (labor, material, overhead) for each year and determine the total cost for each year. (Hint: Use a spreadsheet!)

b. Determine the present worth of each cost category and the total cost.

c. Determine the annual worth over 7 years that is equivalent to the present worth of the total cost

Water is boiled in a pan covered with a poorly fitting lid at a specified location. Heat is supplied to the pan by a 2-kW resistance heater. The amount of water in the pan is observed to decrease by 1.19 kg in 30 minutes. If it is estimated that 75 percent of electricity consumed by the heater is transferred to the water as heat, determine the local atmospheric pressure in that location.

If the air humidity increases and the temperature remains the same, the air pressure will

(1) decrease

(2) remain the same

(3) increase

(4) first Increase, then decrease

The population P (in thousands) of Austin, Texas, during a recent decade can be approximated by

$$y = 494.29 ( 1.03 ) ^ { t },$$

where t is the number of years since the beginning of the decade. a. Tell whether the model represents exponential growth or exponential decay. Identify the annual percent increase or decrease in population. c. Estimate when the population was about 590,000.

Reduction may be described as a(n) $______$ of electrons or as a decrease in $_____$.

The amount of solar heating can increase from:

A. a decrease in sunspot activity and energy output from the Sun

B. a decrease in snow and ice cover on Earth's surface

C. a decrease in the amount of greenhouse gases

D. a huge volcanic eruption that adds ash and dust to the atmosphere

Identify whether a debit or credit results in the indicated change for each of the following accounts.

a. To increase Land 
b. To decrease Cash 
c. To increase Fees Earned (Revenues)
d. To increase Salaries Expense
e. To decrease Unearned Revenue 
f. To decrease Prepaid Rent
g. To increase Notes Payable 
h. To decrease Accounts Receivable
i. To increase Common Stock
j. To increase Store Equipment

What causes a decrease in aggregate supply?

the net working capital of a firm will decrease if there is:

An investment has a 50 percent chance of generating a 10 percent return and a 50 percent chance of generating a 16 percent return. What is the investment’s average expected rate of return?

a. 10 percent.

b. 11 percent.

c. 12 percent.

d. 13 percent.

e. 14 percent.

f. 15 percent.

g. 16 percent.

How might a dramatic decrease in vegetation lead to a decrease in a prey species? (Hint: Think of how the vegetation, prey, and predator could be connected in a food chain.)