Can an atom of an element have six electrons in the $2 p$ sublevel?

What are allotropes? Name three elements that occur as allotropes.

How can a reaction be slowed down?

a) add an inhibitor

b) increase the activation energy

c) add more reactants

d) all of the above

The passenger cabin of an airplane is pressurized. Explain what this term means and why it is done.

Automobile tires become underinflated as temperatures drop during the winter months if no additional air is added to the tires at the start of the cold season. For every $12.2^{\circ} \mathrm{C}$ drop in temperature, the air pressure in a car's tires goes down by about $1 \mathrm{psi}(14.7$ psi equals $1 \mathrm{~atm})$. Complete Table. Then make a graph illustrating how the air pressure in a tire changes over the temperature ranges from $5^{\circ} \mathrm{C}$ to $-25^{\circ} \mathrm{C}$, assuming you start with a pressure of $30.0 \mathrm{psi}$ at $5^{\circ} \mathrm{C}$.

Use Boyle's law to predict the change in density of a sample of air if its pressure is increased.

Convert the pressure measurement $547 \mathrm{~mm} \mathrm{Hg}$ to the following units. a) psi b) in. of $\mathrm{Hg}$ c) $\mathrm{kPa}$ d) atm

MiniLab 2 Explain how air pressure helps you transfer a liquid with a pipet.

MiniLab 1 How might you account for the possible popping of the bag containing the subliming dry ice?

What factors affect gas pressure?

ChemLab How are inferences made about the relationship between volume and pressure in this chapter's ChemLab similar to inferences made from observing the apparatus described in Figure ?

What physical conditions are specified by the term STP?

Your skill in converting units will help you relate measurements of gas pressure made in different units.

Use Table and the equation $1.00 \mathrm{in} .=25.4 \mathrm{~mm}$ to convert the following measurements.

$19.0$ psi to $\mathrm{kPa}$

Would chlorine gas be suitable for weather balloons? Explain.