CHE 117 Practice Problems for Final

Answers to Practice Problems

Lewis dot structures

Draw the Lewis dot structure for each of the following compounds. Predict the compounds shape. Determine whether the compound will be polar or nonpolar

NH₄⁺

CH₂O

AlCl₃

Electron configurations

Write the electron configuration for each of the following elements.

N

Cl

Zn

More pH problems

Determine the pH or [H⁺] for each of the following solutions.

[HCl] = 2.35 x 10^-4

[HNO₃] = 0.000452

[KOH] = 4.65 x 10^-4

sodium carbonate with [^-OH] = 5.6 x 10^-5

potassium acetate with pH = 10.52

benzoic acid with pH = 5.36

More limiting reagent problems

Consider the following reaction. If you have 56.43 grams of carbon monoxide (CO) and 35.73 grams of hydrogen (H₂), how many grams of methanol can form?

CO      +      2 H₂            CH₃OH

Consider the following reaction. If you have 46.5 grams of zinc oxide (ZnO) and 36.5 grams of coke (C), how much zinc (Zn) can you form?

ZnO      +      C            Zn      +      CO

Consider the following reaction. If you have 35.4 grams of bromine (Br₂) and 76.3 grams of aluminum (Al), how much aluminum bromide (AlBr₃) can you form?

2 Al      +      3 Br₂            2 AlBr₃

Answers to Practice Problems