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Unit 1 lesson 1 M&E

Matter and Energy

QuestionAnswer
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 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 substance's ability to change into a new substance with different properties.
Physical Change A change that affects one or 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 In ordinary chemical and physical changes, mass is not destroyed but is only transformed into different substances.
Atoms The smallest unit of an element that maintains the properties of that element.
Element Made up of one or more of the same kind of atom chemically combined.
Compound Made up of different kinds of atoms chemically combined.
Mixture Contains a variety of elements & compounds that are not chemically combined with each other.
Heterogenous A mixture that that does not have a uniform composition.
Homogeneous A mixture that has a uniform composition.
Solid Substance that has a definite volume and shape.
Liquid Substance that has definite volume but no shape.
Gas Does not have a definite volume or shape.
Freezing The change in state in which a liquid becomes a solid.
Melting This change of state from a solid to a liquid.
Evaporation When particles gain energy, they escape from the surface of the liquid and becomes a gas.
Boiling A rapid change from a liquid to a gas, or vapor.
Condensation The reverse of evaporation.
Sublimation The change from a solid state directly into a gas.
Deposition Gas to solid.
Pure Substances A sample of matter,either a single element or a single compound that has definate