chemistry review

Front

What is a Lewis structure?

Back

A Lewis structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

How do you calculate the concentration of a solution after mixing two solutions of different concentrations?

Back

Use the formula: C_final = (C1V1 + C2V2) / (V1 + V2), where C1 and C2 are the concentrations of the two solutions, and V1 and V2 are their respective volumes.

Front

What is the mole ratio in the reaction 2H2 + O2 → 2H2O?

Back

The mole ratio is 2 moles of H2 for every 1 mole of O2 consumed.

Front

What is the difference in neutralization volume between HCl and H2SO4 when reacting with NaOH?

Back

H2SO4 is a diprotic acid, meaning it can donate two protons (H+) per molecule, while HCl is monoprotic. Therefore, for the same molarity, more volume of HCl is needed to neutralize NaOH.

Front

How do you determine the oxidation number of an element in a compound?

Back

The oxidation number can be determined by following a set of rules, including the fact that the sum of oxidation numbers in a neutral compound must equal zero.

Front

What is the oxidation number of sulfur in S2O8^2-?

Back

The oxidation number of sulfur in S2O8^2- is +7.

Front

What is molarity (M) and how is it calculated?

Back

Molarity is a measure of concentration, defined as the number of moles of solute per liter of solution (M = moles of solute / liters of solution).

Front

What is the significance of formal charge in determining the best Lewis structure?

Back

Formal charge helps to identify the most stable Lewis structure by minimizing the charges on atoms, ideally keeping them close to zero.

Front

What is the role of stoichiometry in chemical reactions?

Back

Stoichiometry allows us to predict the quantities of reactants and products involved in a chemical reaction based on the balanced equation.

Front

What is a diprotic acid?

Back

A diprotic acid is an acid that can donate two protons (H+) per molecule in an aqueous solution.