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100
When two or more elements combine to make a more complex substance.
What is a synthesis reaction?
100
The universal solvent.
What is water?
100
An atom or group of atoms that have an electric charge.
What is an ion?
100
How many valence electrons do elements in Group 7 have?
What is 7?
100
This diagram of an atom uses only the outer most electrons.
What is the Lewis Dot?
200
When one element replaces another element in a compound.
What is a single replacement reaction?
200
A mixture that contains a solvent and a solute.
What is a solution?
200
Atoms that have gained electrons and have become negatively charged.
What is an anion?
200
The part of the periodic table that tells you how may energy levels.
What are the periods?
200
This number tells you how many molecules.
What is the co-efficient?
300
When two or more elements trade places.
What is a double replacement reaction?
300
The substance that is dissolved by the solvent.
What is a solute?
300
An atom that has lost electron and have become positively charged.
What is What is a cation?
300
In this type of system, during a chemical reaction matter can not enter or escapr.
What is a closed system?
300
The name given to the elecrons with the highest energy level
What are valence electrons?
400
When compounds break down into simpler products.
What is decomposition?
400
The substance that does the dissolving.
What is the solvent?
400
The attraction between a metal and non- metal which either lose or gain an electron
What is an ionic bond?
400
The number that is located to the left of the formula.
What is the co-efficient?
400
These compounds form hard brittle crystals, have high melting points and when dissolved in water or melted they conduct electric current.
What are ionic compounds?
500
In a chemical reaction all atoms present at the start of a reaction are present at the end of the reaction.
What is the Law of Conservation of Mass?
500
How much solute can dissolve in a solvent at a given temperature.
What is a solution?
500
The attraction usually between elements on the right side of the periodic table share electrons.
What is a covalent bond?
500
The small number located to the bottom right of an element.
What is the subscript?
500
These compounds do not conduct electric current when dissolved in water and have low melting points.
What are covelent molecules?
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