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Compounds
Formulas
Equations
Balancing Equations
Law of Conservation of Mass
100
A pure substance composed of two or more elements that are chemically combined
What is a compound
100
A shorthand way to use chemical symbols and numbers to represent a substance
What is a chemical formula
100
If you know the formula for a covalent compound, you can determine the name by using these
What are prefixes
100
To correctly describe a chemical reaction, a chemical equation must be this
What is balanced
100
Antoine Lavoisier did work in the 1700's that later became this
What is the Law of Conservation of Mass
200
Elements join in specific _____________ according to their masses to form a compound
What are ratios
200
A chemical formula shows how many of these of each kind are present
What are atoms
200
In an ionic compound, the compound is made of these
What is a metal and a nonmetal
200
It is very important to be this when writing chemical equations
What is accurate
200
These are never gained or lost during a chemical reaction
What are atoms
300
Compounds have a unique set of physical and chemical _____________________
What are properties
300
This is the number written below and to the right of a chemical symbol in a formula
What is a subscript
300
A chemical equation uses symbols and numbers to describe this
What is a chemical reaction
300
This is the number placed before a chemical symbol or formula
What is a coefficient
300
The law states that this never happens to atoms during a chemical reaction
What is they are neither created nor destroyed
400
Compounds have different properties than the ______________ that make them up.
What are elements
400
If there is no subscript, there are this many atoms of that element present
What is one
400
The starting materials in a reaction are these
What are reactants
400
You cannot change these when balancing a chemical equation
What are subscripts
400
The total ____________ of the reactants and products is always the same based on the law
What is the mass
500
Some compounds can be broken down into these by chemical changes
What are elements?
500
In the chemical formula for a molecule of glucose, there are this many hydrogen atoms
What is 12
500
The substances formed in a reaction are these
What are products
500
To balance an equation, you must do this to each subscript by the formula's coefficient
What is multiply
500
A chemical equation must be this due to the law
What is balanced