Chapter 5 Chemistry Calculations Flashcards
Mole
A group of atoms, molecules, or formula units that contains 6.022 *10^23^ of these items.
Molar mass
The mass in grams of 1 mole of an element is equal numerically to its atomic mass. The molar mass of a compound is equal to the sum of the masses of the elements in the formula.
Avogadro’s number
The number of items in a mole , equal to 6.02 * 10^23^.
Balanced equation
The final form of a chemical reaction that shows the same number of atoms of each element in the reactants and products.
Chemical equation
A shorthand way to represent a chemical reaction using chemical formulas to indicate the reactants and products.
Chemical reaction
The process by which a chemical change takes places
Chemical change
The formation of a new substance with a different composition and properties than the initial substance.
Coefficients
Whole numbers placed in front of the formulas in an equation to balance the number of atoms of each element.
Combination reaction
A reaction in which reactants combine to form a single product.
Combustion reaction
A reaction in which an element or a compound reacts with oxygen to form oxide products.
Normally a fuel + oxygen gas –> carbon dioxide + water.
Decomposition reaction
A reaction in which a single reactant splits into two or more simpler substances.
Double displacement (replacement) reaction
A reaction in which parts of two different reactants exchange places.
Normally compound + compound –> compound + compound
Single displacement (replacement) reaction
A reaction in which an element replaces a different element in a compound.
Normally element + compound –> element + compound.
Reactants
The initial substances that undergo change in a chemical reaction.
Products
The substances formed as a result of a chemical reaction.
