Give the two elements that are liquids and the five (other than the six noble gases) that are gases at room temperature and atmospheric pressure.

Which halogens are gases at room temperature and atmospheric pressure?

How does the size of atoms change (a) across a period and (b) down a group? 11.5 Naming Compounds

What are the common names for these compounds: $\mathrm{CH}_4$, $\mathrm{N}_2 \mathrm{O}, \mathrm{NO}, \mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq}) ?$

A gas mixture at room temperature contains 10.0 mo! CO and 12.5 mol O2. (a) Compute the mole fraction of CO in the mixture. (b) The mixture is then hea ted, and the CO starts to react with the O2 to give CO2:

$$CO(g)+½O2(g)→CO2(g)$$

At a certain point in the heating, 3.0 mo! CO2 is present. Determin e the mole fraction of CO in the new mixture.

A sample of 3.00 g of

$$SO_2(g)$$

or iginally in a 5.00-L vessel at

$$21 ^ { \circ } \mathrm { C }$$

is transferred to a 10.0-L vessel at

$$26 ^ { \circ } \mathrm { C }$$

A sample of 2.35 g of

$$N_2(g)$$

originally in a 2.50-L vessel at

$$20 ^ { \circ } \mathrm { C }$$

is tran sferred to th is same 10.0-L vessel. What is the total pressure in the vessel?

A sample of 3.00 g of

$$SO_2(g)$$

or iginally in a 5.00-L vessel at

$$21 ^ { \circ } \mathrm { C }$$

is transferred to a 10.0-L vessel at

$$26 ^ { \circ } \mathrm { C }$$

A sample of 2.35 g of

$$N_2(g)$$

originally in a 2.50-L vessel at

$$20 ^ { \circ } \mathrm { C }$$

is tran sferred to this same 10.0-L vessel. What is the partial pressure of

$$N_2(g)$$

in this vessel?

Differentiate between an atom and a molecule, an atom and an ion, and a molecule and a polyatomic ion.

Assume that a single cylinder of an automobile engine has a volume of

$$524 cm^3.$$

How many grams of

$$C_8H_{18}$$

could be combusted by this quantity of

$$O_2,$$

assuming complete combustion with formation of

$$CO_2$$

and

$$H_2O?$$

Assume that a single cylinder of an automobile engine has a volume of

$$524 cm^3.$$

If the cylinder is full of air at

$$74 ^ { \circ } \mathrm { C }$$

and 0.980 atm, how many moles of

$$O_2$$

are present? (The mole fraction of

$$O_2$$

in dry air is 0.2095.)

A mixture consisting of 7.0 g of CO and 10.0 g of SO2, two atmospheric pollutants, has a pressure of 0.33 atm when placed in a sealed container. What is the partial pressure of CO?

Why is it inevitable to use Greek prefixes when naming compounds containing two nonmetals?

Summarize the properties of the metalloids.

Classify each of these elements as representative, transition, or inner transition; state whether each is a metal or a nonmetal; and give its normal phase: (a) uranium, (b) chromium, (c) radon.