20 terms

Chemistry - Vocabulary

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Period
The horizontal rows on the periodic table.
Family/Group
The vertical columns on the periodic table.
Metals
-Good conductors
-Malleable
-Ductile
-Metallic luster
-Solid at room temperature
Malleable
Capable of being shaped.
Easy to shape, bend, press down.
Ductile
Describes a material that can be pulled out into a long wire.
Metalloids
Elements that have properties of both metals and nonmetals.
Non-metals
-Brittle when solid
-Dull
-Poor conductors
-Lower melting and boiling points than metals
Signs of a Chemical Reaction
Odor, gas, light, heat, color change, new substance exists
Law of Conservation of Mass
Matter cannot be created nor destroyed; the total mass of products equals the total mass of the reactants.
Coefficient
Number in front of a compound's chemical formula telling you how many molecules of that compound.
Subscript
Number written after an element in a chemical formula telling you how many atoms there are for each element.
Balanced Equation
Chemical equation where the total mass of the reactants equals the total mass of the products. Produced by changing the coefficients of the compounds.
Chemical Equation
Written representation of a chemical reaction/chemical change; shows all the reactants and products. Always in the form of: Reactants arrow Products.
Chemical Change
Chemical reaction; when substances interact with each other. Original substances are used up.
Physical Change
When a substance changes its phase (changes to a solid, liquid , gas, or plasma) or is modified (size, shape, etc) but remains the same substance.
Compound
A chemical combination of 2 or more different atoms.
Molecule
A chemical combination of 2 or more atoms.
Products
Substance(s) existing after a chemical reaction takes place. Found to the right of the arrow.
Reactants
Substances existing before a chemical reaction takes place. Found to the left of the arrow.
yield sign
the arrow in the middle of the equation