practice problems ap chem midterm

(1.5) Write the electron configuration for Calcium ion, Ca+2

1s2, 2s2, 2p6, 3s2, 3p6

(2.1) Nonpolar, polar, or ionic; NaF

Ionic

(2.3) Why does KBr (672kj/mol) have a higher lattice energy than KI(632kj/mol)

KBr is smaller so it has higher lattice energy

(3.1) The boiling point of HF is 293K whereas the boiling point of F2 is 85K, determine the types of IMF present.

LDF, Hydrogen bonding

(1.1) GIven 10.0 gram samples of LiCl, LiBr, LiF, and LiI, place the samples in order of least to greatest number of atoms of Li.

LiI, LiBr, LiCl, LiF

(3.3) Why cannot liquids be compressed easily?

Liquid Molecules are relatively close together

(1.7) Larger atomic radius, Na and O

Na

(1.8) Calcium reacts with a certain element to form a compound with the general formula CaX2. What would be the most likely formula for a compound formed between sodium and element X?

NaX

(2.1) Nonpolar, polar, or ionic; CH4

Nonpolar

(2.1) Nonpolar, polar, or ionic; H2

Nonpolar

(2.1) Nonpolar, polar, or ionic; ZnCl2

Polar

(3.12) What is the frequency of light with energy 3.3 x 10^-19

v = 5.0 x 10^14

(2.5) Draw a lewis diagram for C2H3Cl

*I cant put pictures in figure it out*

(2.5) Draw a lewis diagram for CF2S

*I cant put pictures in figure it out*

(2.6) Draw all resonance structures of SO2

*I cant put pictures in figure it out*

(2.6) Draw the resonance structures of the carbonate ion, CO3-2

*I cant put pictures in figure it out*

(3.7)What would be the concentration of chloride ion, [Cl-1] in a solution that is made by dissolving 10.0g zinc chloride, ZnCl2, in a solution that has a final volume of 500mL?

0.296M Cl-1

(1.1) A 0.244g sample of calcium carbonate(CaCO3) was recovered from a sample of hard water. How many formula units of CaCO3 were in the sample?

1.47 x 10^21

(2.1) Place the following bonds in order of increasing polarity; C-H, C-F, C-C, C-O, Ca-C

C-C, C-H, C-O, C-F, Ca-C

(1.3) A certain sugar used in treating patients with low blood sugar has the following chemical composition: 40.0% carbon, 6.70% hydrogen, and 53.3% oxygen. What is the empirical formula?

CH2O

(3.5) Given a sample of H2, HCl and Cl2 at the same temperature. place the particles in order of decreasing average particle speed.

Cl2, HCl, H2 (heavier the gas, slower it moves)

(1.7) Higher first ionization energy, Li and F

F

Higher electronegativity, Li and F

F

(1.1) a. How many moles of methane are there in 7.21g sample? b. How many particles of methane are there in the sample? c. How many atoms of hydrogen are found in the sample?

a. 0.451mol b. 2.71 x 10^23 c. 1.09 x 10^24 atoms H

(1.4) A sample of a mixture of aluminum and aluminum oxide weighing 120.91g were analyzed and the total mass of aluminum in the sample was 120.32g. a. what mass of oxygen was in the sample? b. what mass of aluminum oxide was in the mixture? c. what is the mass percent of aluminum oxide in the aluminum and aluminum oxide mixture? (Balanced equation 4Al + 3O2 -> 2Al2O3)

a. 0.59g oxygen b. 1.3g Al2O3 c. 1.1%