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Introduction

vocab 1

TermDefinition
Chemistry The study of the composition of matter and the changes that matter undergoes
Hypothesis A proposed explanation for an observation
Matter Anything that has mass and occupies space
Observation Making use of your senses to obtain information
Scientific Methodology The steps don't have to occur in order (Observation, hypothesis, experiment, theory)
Theory A well-tested explanation for a broad set of observations
Chemical Change A change that produces matter with a different composition than the original matter. Observations include gas given off, precipitates formed, temperature change, or color change.
Compound The substance that contains two or more elements chemically combined in a fixed proportion. Can be separated chemically
Element The simplest form of matter that has a unique set of properties. Cannot be separated.
Gas A form of matter that takes both the shape and volume of it's container. Particles are far apart from each other.
Heterogeneous mixture A mixture in which the composition is not uniform throughout. Can be separated physically.
Homogeneous mixture A mixture in which the composition is uniform throughout. Can be separated physically.
Law of Conservation of Mass/Matter States that any physical change or chemical reaction, mass is conserved. Mass is neither created nor destroyed.
Liquid A form of matter that has an indefinite shape, flows, yet has a fixed volume. Particles are close together but are able to move freely
Mixture A physical blend of two or more components. Usually a liquid.
Physical Change Some properties of material change, but the composition of material does not change.
Solid A form of matter that has definite shape and volume. Particles are packed close together.
Solution Another name for a homogeneous mixture
Accuracy Is a measure of how close a measurement comes to the actual, or true value of whatever is measured. The measured value must be compared to the correct value
Density Is the ratio of mass of an object to its volume. Depends only on the composition of a substance, not the size of its sample. A physical property that represents how close or far apart the particles of a substance are, D=m / v
Precision It is a measure of how close a series of measurements are to one another, irrespective of the actual value. You must compare the values of two or more repeated measurements
Accepted value The correct value for the measurement based on reliable references
Measured value/ experimental value The value measured in the lab
Created by: abbeebrandow
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