May 7, 2019

AP Chemistry is a college level chemistry exam covering a variety of chemistry topics.

Lets practice with some questions to get a taste of the exam.

1. In solid methane, the forces between neighboring molecules are best characterized as 

a. ionic

b. covalent

c. hydrogen bonds

d. ion-dipole forces

e. London dispersion forces

Methane, CH4 is a non polar molecule. The forces between neighboring molecules are called intermolecular...

April 10, 2019

(A) BeCl2

(B) SO2

(C) N2

(D) O2

(E) F2

  1. Is a polar molecule. The easiest way to figure out whether a molecule is polar or non polar is to use these two principles: for a molecule to be nonpolar the central atom is surrounded by the sea atoms and has no lone pairs. Therefore, F2, O2, N2 are nonpolar (since its the same atoms connected to each other). BeCl2 is also nonpolar since beryllium is connected to two chlorines and...

April 9, 2019

The free response questions to the 2018 AP Chemistry can be founder here: https://apcentral.collegeboard.org/pdf/ap18-frq-chemistry.pdf?course=ap-chemistry

Let's now understand the questions and how to answer them.

1. A student performs an experiment to determine the value of the enthalpy change, DH, for the

oxidation-reduction reaction represented by the balanced equation above.

(a) Determine the oxidation number of Cl in...

April 5, 2019

AP Chemistry consists of the following topics: Structure of the atom, periodic table, ionic and covalent compounds, stoichiometry, gases, liquids and solids, solutions, chemical equilibrium, kinetics, thermodynamics, electrochemistry, acids and bases, laboratory.

July 31, 2017

In solid methane, the forces between the neighboring CH4 molecules are best characterized as 

a. ionic 

b. covalent

c. hydrogen

d. ion-ion

e. London (dispersion) forces

Answer and Explanation:

In order for us to identify the type of correct intermolecular forces, we need to first identify what kind of molecule CH4 is. 

Ionic forces are present in ionic compounds. Ionic compounds have a metal with a nonmetal or a metal with...

July 10, 2017

Which of the following aqueous solutions has the lowest freezing point?

(A) 0.2 m NaCl
(B) 0.2 m CaCl2

(C) 0.2 m H2SO4

(D) 0.2 m NH3
(E) 0.2 m Al(NO3)3 

Answer and Explanation:

Freezing point of a pure solvent depends on the amount of solute that gets dissolved in it. In order to determine which solution has the lowest freezing point, we need to look at the molality as well as whether the solute is ionic or covalent. Since...

July 8, 2017

Under which of the following conditions can an endothermic reaction be thermodynamically favorable?

(A) ΔG is positive (B) ΔS is negative (C) TΔS > ΔH (D) TΔS = 0

(E) There are no conditions under which an endothermic reaction can be thermodynamically favorable. 

Answer and explanation:

To be thermodynamically favorable, a reaction must have negative ΔG (Gibbs Free Energy). 

 The formula for Gibbs Free Energy is ΔG = ΔH...

July 6, 2017

Solid Al(NO3)3 is added to distilled water to produce a solution in which the concentration of nitrate, [NO3-], is 0.10 M. What is the concentration of aluminum ion, [Al3+], in this solution?

(A) 0.010 M (B) 0.033 M (C) 0.066 M (D) 0.10 M (E) 0.30M 

Answer and Explanation: Looking at the formula Al(NO3)3, we notice that for 1 Al ion, there are 3 NO3 ions. Therefore when aluminum nitrate dissociates in water, it produces 1...

January 11, 2017

The weight of H2SO4 (molecular weight 98.1) in 50.0 milliliters of a 6.00-molar solution is

(A) 3.10 grams
(B) 12.0 grams
(C) 29.4 grams
(D) 294 grams
(E) 300. grams

Answer:

Molarity= moles of solute/Liters of solution

We plug in molarity and volume (convert ml to L by dividing by 1000), to get 6M = moles/ 0.05L

moles = 0.3 moles of H2SO4

Now, we have to cover moles to grams

0.3 moles of H2SO4 ( 98.1 grams/mole) = 29.43 grams.

...

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