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Midterm Review

TermDefinition
Density Mass / Volume
Atomic number The number of protons in the nucleus.
Elements on a periodic table increase by... The atomic numbers.
Protons Charge Positive
Neutron Charge Neutral
Electron Charge Negative
Nucleus contains... Protons and Neutrons.
Electrons move around the... Nucleus.
How many of each atom is in MgBr2 Mg = 1 Br = 2
Periods Rows
Groups Columns
Carbon Nonmetal
Magnesium Metal
Potassium Metal
Sodium Metal
Isotope Same element with a different number of neutrons.
Gain electrons N Negative charge -N
Lose electrons H Positive charge +H
Solids atoms are... tightly packed.
Liquid's atoms are.. close together, but able to move.
Gas'es atoms are... far apart.
Condensation Gas to a Liquid
Sublimation Solid to a Gas
Evaporation Liquid to a Gas
Melting point Temp. when a Solid turns to a Liquid.
Freezing point Temp. when a Liquid turns to a Solid.
Homogeneous mixture A mixture that looks like one thing and isn't easy to separate.
Heterogeneous mixture A mixture that looks like different things and is easy to separate.
Temp. decreases when a substance... Loses heat energy.
Temp. increases when a substance... Gains heat energy.
Acids turn Litmus paper Red
Bases turn Litmus paper Blue
Endothermic Feels cold
Exothermic Feels hot
1 - 6 on pH scale is an Acid
7 on pH scale is Nuetral
8 - 14 on pH scale is a Base
Physical Change Change in the state of matter.
Chemical Change Change in the chemical make up of a substance.
Factors that increase reaction rate. Temp, Surface Area, and Concentration.
Reactants Substances before a Chemical reaction, on left side of a chemical equation
Products Substances after a Chemical reaction, on right side of a chemical equation.
Ag2O --> Ag + O2 Unbalanced 2Ag2O --> 4Ag + O2 Balanced.
Created by: matthew.lindsly