Ch 3: Chemical Reactions

Question 0

Chemical Equation

Answer 0

A representation of a chemical reaction using the chemical formulas of the reactants and products; a balanced chemical equation contains equal numbers of atoms of each element on both sides of the equation.

Question 1

Avogadro’s number (NA)

Answer 1

The number of C-12 atoms in exactly 12 g of C-12; it equals 6.022 X 10^23 mol^-1

Question 2

Combination reaction

Answer 2

A chemical reaction in which two or more substances combine to form a single product.

Question 3

Combustion reaction

Answer 3

A chemical reaction that proceeds with evolution and heat and usually also a flame; most combustion involves reaction with oxygen, as in the burning of a match.

Question 4

Decomposition reaction

Answer 4

A chemical reaction in which a single compound reacts to give two or more products.

Question 5

Formula weight

Answer 5

The mass of the collection of atoms represented by a chemical formula; for example, the formula weight of NO2(46.0amu) is the sum of the masses of one nitrogen and two oxygen atoms.

Question 6

Limiting reactant (reagent)

Answer 6

The reactant present in the smallest stoichiometric quantity in a mixture of reactants; the amount of product that can form is limited by the complete consumption of the limiting reactant.

Question 7

Molecular weight

Answer 7

The mass of the collection of atoms represented by the chemical formula for a molecule.

Question 8

Product

Answer 8

A substance produced in a chemical reaction; it appears to the right of the arrow in a chemical equation.

Question 9

Reactant

Answer 9

A starting substance in a chemical reaction; it appears to the right of the arrow in a chemical equation.

Question 10

Theoretical yield

Answer 10

The quantity of product that is calculated to form when all of the limiting reagent reacts.