Unit 4 Chemical Equations Flashcards
A number written below and to the right of a chemical symbol, shows the number of a specific type of atom present
Subscript
A shorthand notation that uses chemical symbols and numbers as subscripts to represent the type of atoms and number of atoms that are present in the smallest unit of the substance</p>
Chemical Formula
<p class=”large” style=”text-align:center”;>The process by which one or more substances change to produce one or more different substances</p>
<p class=”large” style=”text-align:center”;>Chemical Reaction</p>
Chemical formulas and symbols written to represent a reaction
Chemical Equation
A number placed in front of a chemical symbol or formula during balancing of the equation
Coefficient
A substance that takes part in and undergoes change during a reaction
Reactants
A substance produced during a chemical reaction
Products
<p class=”large” style=”text-align:center”;>The mass of all reactants must equal the mass of all products, mass is neither created nor destroyed</p>
<p class=”large” style=”text-align:center”;>Law of Conservation of Mass</p>
The amount of matter an object contains, measured in grams
Mass
A symbolic representation of a chemical reaction in which both sides of the equation contain equivalent numbers of atoms of each element. The mass and the charge must be balanced on both sides of the reaction.
Balanced Chemical Equation
The characteristics of a substance: physical and chemical
Property
Elements or compounds that can only be separated or combined to make substances with new properties by means of a chemical reaction
Substance
The characteristics of a substance: physical and chemical
<p>Property</p>
A solid substance that forms in a liquid from a chemical reaction
Precipitate
A reaction that gets cold because heat energy is absorbed from the surroundings
Endothermic
A reaction that gets hot because heat energy is released
Exothermic
Chemical formulas and symbols written to represent a reaction
Chemical Equation
A substance that takes part in and undergoes change during a reaction
Reactants
A solid substance that forms in a liquid from a chemical reaction
<p>Precipitate</p>
Two elements react to form a compound
Synthesis
A compound breaks down into two substances (an element and a compound)
Decomposition
<p class=”large” style=”text-align:center”;>The process by which one or more substances change to produce one or more different substances</p>
<p class=”large” style=”text-align:center”;>Chemical Reaction</p>
Two elements from different compounds switch places and form new substances
Double Replacement
When an organic substance combines with oxygen and releases large amounts of heat and light energy
Combustion
<p class=”large” style=”text-align:center”;>A single element replaces another in a compound and forms new substances</p>
<p class=”large” style=”text-align:center”;>Single Replacement</p>
2MgO How many atoms of magnesium in this chemical formula?
2 atoms
A Coefficient tells you how many ? of a formula.
Molecules
A subscript shows you how many of what element?
atoms
The arrow is know as the
yields
Chemical Equations must be balanced because of what Law
The Law of Conservation of Mass
The new substance formed in a chemical equations is on what side?
right side
Bubbles forming in a chemical reactions are a sign of what?
Gases
