AP CHEM Unit 2 Days 1-3

Front

What is the balanced equation for the combustion of methane (CH₄)?

Back

CH₄ + 2 O₂ → CO₂ + 2 H₂O

Front

Define molarity (M).

Back

Molarity is the number of moles of solute per liter of solution.

Front

What is a precipitation reaction?

Back

A precipitation reaction is a chemical reaction that results in the formation of an insoluble solid (precipitate) from soluble reactants.

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the ideal gas law equation?

Back

PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, T = temperature in Kelvin.

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water is approximately 18.02 g/mol.

Front

How do you find the volume of a gas at STP?

Back

At STP (Standard Temperature and Pressure), 1 mole of an ideal gas occupies 22.4 liters.

Front

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

Back

The stoichiometric ratio is 2:1:2 for H₂:O₂:H₂O.

Front

Define limiting reactant. Give an example.

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product formed. Example: In the reaction of 2 H₂ + O₂ → 2 H₂O, if you have 2 moles of H₂ and 1 mole of O₂, O₂ is the limiting reactant.

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of moles of each reactant and product involved in the reaction.