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Chemistry U1 Test

Review Guide for Unit 1.

QuestionAnswer
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.
Created by: allisonnicole21