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Midterm Review
Term | Definition |
---|---|
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. |