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Chapt 15 8th Grd Sci

Classification of Matter

The study of matter and how it is affected by energy Chemistry
The study of energy and how it effects matter Physics
Anything that has mass and takes up space Matter
Into what 2 main categories can matter be classified? Pure Substances and Mixtures
A substance made up of only one type of atom Element
A substance made up of two or more elements; cannot be easily separated Compound
A substance made up of two or more substances that can be separated by physical means Mixture
The prefix hetero means _______ different
The prefix homo means ______ the same
What type of mixture contains substances that are unequally dispersed throughout? heterogeneous
What type of mixture is made up of substances equally dispersed throughout? homogeneous
Separation of a solid dissolved in a liquid by weight as it moves up something Chromatography (Inks separated on paper)
Separation of liquids by pouring off the “lighter” one Decanting (oil and water)
Separation of liquids with different boiling points by boiling one and condensing is in another vessel Distillation (alcohol and water)
Separation of a solid from a liquid Evaporation or Boiling
Separation of an undissolved solid and a liquid Filtering
Separation of a magnetic solid from other materials Magnetism
Separation of solids of different sizes Sieving or Screening
A heterogeneous mixture with larger particles that never settle Colloid
What keeps the large particles in colloids from settling? The constant random motion (Brownian motion) of smaller particles within the colloid keeps them suspended.
What occurs within colloids because of the larger particles? The Tyndall Effect; a scattering of light as it passes through a colloid and strikes the larger particles
A heterogeneous mixture containing a liquid from which visible particles settle out suspension (Italian dressing, muddy water)
A homogenous mixture is also called this A solution
A solution contains two parts: _______ & _______ The solute and the solvent
This is the solid that dissolves to create a solution The solute
This is the liquid into which the solid dissolves The solvent
Characteristic of a substance which can be observed without changing its identity. Physical Property
What are some physical properties? Color shape, size, texture, luster, state of matter, magnetism, ductility viscosity, heat conduction, electrical conduction, freezing or boiling points
Into what two categories do physical properties fall? Appearance and Behavior
A change in a substance’s size, shape, or state of matter without changing its identity Physical change.
A change of a substance into one or more other substances Chemical change
List some signs of a chemical change heat or cold, light produced, electricity released, gas made, precipitate formed, definite color change, new substance(s) formed
Characteristics of a substance indicating that it can change chemically (to a different substance) Chemical properties
When a substance undergoes a chemical change, we say it has ________ reacted (undergone a chemical reaction)
What are some chemical properties? Flammability, Combustibility, Corrosive
State the Law of Conservation of Matter In a closed system, the mass of all substances present before a chemical change equals the mass of all substances after the change.
Physical and chemical changes to the Earth’s surface over a long period of time Weathering
What causes weathering? Earthquakes, runoff, acid rain, among many other things
What is the reaction of oxygen in a flame test? A glowing split relights
What is the reaction of hydrogen in a flame test? A lit splint “barks” explosively
What is the reaction of Carbon dioxide (CO2) in a flame test? A lit splint goes out.
Created by: judi829



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