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Unit 1: Lesson 1-6

Matter and Energy

matter anything that has mass and takes up space
mass describes the amount of matter in an object
weight a measure of the gravitational force on an object
volume the amount of space that an object takes up, or occupies
density a measure of the amount of mass in a given volume
physical property a characteristic of a substance that can be observed and measured without changing the identity of the substance
chemical property describes a substances ability to change into a new substance with different properties
physical change is a change that affects one ore more physical properties of a substance
chemical change occurs when one or more substances change into entirely new substances with different properties
law of conservation of mass states the in ordinary chemical and physical changes, mass is not created or destroyed but is only transformed into different substances
atom are the smallest unit of an element that maintains the properties of that element
pure substances is a substance that has a definite physical and chemical properties such as appearance, melting point and re activity
heterogeneous mixture is one that does not have a uniform composition
homogeneous each part of the sugar water has the same sweet taste
solid substance has a definite volume and shape
liquid substance has a definite volume but not a definite shape
gas does not have a definite volume or shape
freezing the change in state when a liquid becomes a solid
melting the change of state when a solid becomes a liquid
evaporation the change of state when a liquid becomes a gas
boiling a rapid change from liquid to a gas,or vapor
condensation the change of state from a gas to a liquid
sublimation the change from a solid state directly into a gas
deposition the change in state from a gas directly into a solid
Created by: 18mwarren0515