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Chem Unit 1

laboratory vocab, reactions

Atom The smallest unit of matter
Element Multiple atoms of the same kind put togehter
Compound Multiple different atos put together.
Heterogeneous Sand and water in a container (can be separated)
Mixtures Made up of 2 different substances
Suspension A substance that takes a long time to separate (blood)
Homogenous Every atom is the same type/size (Kool-Aid)
Methods of separation for heterogenous mixtures filter, distillation, magnet
Methods of separation for homogenous mixtures a lot of other complex methods
Method of separation for heterogenous suspension mixtures centrifugation
Physical change ex: water+heat>water vapor
chemical change ex: Ka&H202
Accuracy A measure of how close a measurement comes to the actual value of whatever is measured
precision a measure of how close a series of measurements are to one another
percent error used to determine the accuracy of measurements
percent error equation (|measured-theoretical| / theoretical) * 100
Meniscus Low point of water's surface tension
Purpose of using scientific notation used to simplify #s that are too big or small to easily work with
Alchemists precursor to the chemist
Processes that alchemists developed separating mixtures, purifying chemicals
Lavoisier father of chemistry who designed a balance that could measure mass to the nearest 0.0005 gram
scientific method observe, hypothesis, experiment, analyze data, accept/reject hypothesis, publish experiment
Difference between a theory and a law Theory=long explanation; changeable. Law= short; equations can come from laws
qualitative measurement smell, touch, sight
quantitative measurement measurements
Metric system M k h da _ d c m
Density Intensive property that depends only on the composition of a substance, not on the size of the sample.
Equation for density mass/volume. ans must have the least sig figs
Created by: allyson.lee