Question | Answer |
What is Chemistry? | The study of the composition, structure, & properites of matter. |
What is a chemical? | Any substance with a definite composition. |
What is the Extensive Property? | Property that depends on the amount of matter. (i.e. volume, mass, energy) |
What is the Intensive Property? | Property that does NOT depend on the amount of matter. (i.e. density, melting point, boiling point) |
What are the two properties of matter? | 1. has mass
2. takes up space |
What is a Chemical Change? | When one substance completely changes to a new substance. |
What is a Chemical Property? | A substances ABILITY to undergo changes to transform to a new substance. |
What is a Physical Property? | Anything you can OBSERVE without changing a substance.(5 senses) |
What is a Physical Change? | Substance that doesn't form a new substance with change. |
What is a Pure Substance? | Substance that can't be seperated by physical means. It is even throughout, has a fixed composition. (element or compound) |
What is a Mixture? | Blend of two or more types of matter that keep their own identity. |
What are the two forms of a mixture? | 1.) Homogenous- uniform/even throughout
2.) Heterogenous- different throughout |
What is a period? | Periods are horizontal on the periodic table. |
What is a group? | Also known as a family, they are vertical on the periodic table. |
What are the characteristics of a metal, nonmetal, & metalloid? | Metal- Malleable, Ductile, Solids, and shiny.
Nonmetal- Not malleable, Not ductile, brittle.
Metalloid- semi-conductors, not as malleable or ductile. |
What are the SI Units for length, volume, time, & mass? | Length- meters/km, cm, mm
Volume- L, m^3, cm^3
Time- second
Mass- g, kg |
What is density? | Density= mass/volume |
Precision is scientific measurement? | How close your numbers are to each other. |
Accuracy in scientific measurement? | How close you are too ACCEPTED value. |