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      reaction arrow       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      reaction arrow       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      reaction arrow       2 AlBr3


Answers to Practice Problems