Collision theor y states that molecules can break bonds and form new substances when they collide with sufficient energy and suitable orientation . What types of evidence could support each of the following aspects of collision theory?

a. Formation of new substances.

b. Requirement for sufficient energy.

c. Requirement for suitable orientation

Consider the data you graphed in Developing Skills C.2.

a. List two scientific claims you could make based on the data or the graph.

b. For each claim, cite evidence for making that claim.

If air at $25^{\circ} \mathrm{C}$ has a density of $1.28 \mathrm{~g} / \mathrm{L}$ and your classroom has a volume of $2.0 \times 10^5 \mathrm{~L}$,

a. what mass of air is contained in your classroom?

b. assume that the room temperature is increased. How would that affect the total mass of air contained in the room,

i. if the room were tightly sealed?

ii. if the room were not sealed?

Write and balance the equation for formation of $\mathrm{SO}_3$ from $\mathrm{SO}_2$ and oxygen.

Sketch the gas particles in

a. a balloon submerged in hot water .

b. a balloon submerged in ice water

Use your own words to describe each of the following : How the relationships described in your answers.

What would happen to the pressure exerted by a gas sample if both the temperature of the gas and the volume occupied by the gas were doubled , while holding the amount of gas constant?

Use KMT to explain why

a. gases expand to fill the space available.

b. gas pressure is proportional to temperature at constant volume .

U.S. weather reports generally express air pressure in units of inches of mercury . During a severe storm, the barometric pressure can drop as low as 27.2 inches of mercury. Convert this air-pressure value to:

a. millimeters of mercury (mmHg). (Hint: l inch = 25.4 mm)
b. atmospheres (atm).
c. kilopascals (kPa).

Do gases in the atmosphere ever react with one another? How do you know?

What happens to the molecules in a sample of gas as it is heated?

What causes acid rain?

a. Has the atmosphere's composition changed significantly throughout human history?

b. What evidence can you cite to support your claim?

How is air pollution influenced by weather and climate?