Draw a valid Lewis structure for each molecule. a. CH$_3$Br b. PH$_3$

Draw a Lewis structure for each of the following molecules, and then use the VSEPR theory to predict the molecular geometry of each: a.

$$\mathrm { SCl } _ { 2 }$$

, b.

$$\mathrm { PI } _ { 3 } ^ { 2 }$$

, c.

$$\mathrm { Cl } _ { 2 } \mathrm { O }$$

, d.

$$\mathrm { NH } _ { 2 } \mathrm { Cl }$$

, e.

$$\mathrm { SiCl } _ { 3 } \mathrm { Br }$$

, f. ONCI

Draw Lewis structures for each of the following molecules. a. contains one C and four F atoms, b. contains two H and one Se atom, c. contains one N and three I atoms, d. contains one Si and four Br atoms, e. contains one C, one Cl, and three H atoms

Rank the following atoms in order of increasing electronegativity. Label the most electronegative and most electropositive atom in each group. a. Se, O, S b. P, Na, Cl c. Cl, S, F d. O, P, N

Identify the type of atom that generally forms covalent bonds.

Write the ion symbol for an atom with the given number of protons and electrons.
a. 19 protons and 18 electrons c. 35 protons and 36 electrons
b. seven protons and 10 electrons d. 23 protons and 21 electrons

Draw a valid Lewis structure for each molecule. a. HI b. CH$_2$F$_2$

Silicon has three naturally occurring isotopes (Si-28, Si-29, and Si-30). The mass and natural abundance of Si-28 are 27.9769 amu and 92.2%, respectively. The mass and natural abundance of Si-29 are 28.9765 amu and 4.67%, respectively. Find the mass and natural abundance of Si-30 .

Ammonium nitrate is the most common source of the element nitrogen in fertilizers. When it is mixed with water, the solution gets cold, so it is used in instant cold packs. When mixed with diesel fuel it forms an explosive mixture that can be used as a bomb. Write the structure of ammonium nitrate

CaSO$_3$ is used to preserve cider and fruit juices. Name this ionic compound.

If P(A) = 0.3, P(B) = 0.2, and P(A ∩ B) = 0.1, determine the following probabilities: a. P(A') b. P(A ∪ B) c. P(A' ∩ B) d. P(A ∩ B') e. P[(A ∪ B') f. P(A' ∪ B)

Ammonium carbonate is the active ingredient in smelling salts. Write its formula.

Write the formula for silver nitrate, an antiseptic and germ killing agent.

Complete the following table by filling in the formula of the ionic compound derived from the cations on the left and each of the anions across the top.