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22 Cards in this Set
- Front
- Back
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volume
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The amount of space an object takes up.
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atom
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The smallest particle that still behaves like the original matter it came from.
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molecule
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Two or more atoms joined together. An example is water - made of hydrogen and oxygen.
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nucleus (atom)
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A dense area in the center of an atom that contains protons and neutrons.
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element
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Matter made up of only one kind of atom.
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periodic table
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A chart that scientists use to organize the elements.
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Matter
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anything that has mass and takes up space.
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states of matter
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solid, liquid and gas
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physical change
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A change in which the form of a substance changes but the substance still has the same chemical makeup. An example is water freezing and melting or boiling to be vapor - crushing, cutting, bending etc.
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density
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The measure of how closely packed an object´s atoms are.
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mixture
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A combination of two or more different substances.
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solution
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A mixture in which all the parts are mixed evenly.
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combustibility
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A measure of how easily a substance will burn.
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reactivity
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The ability of a substance to go through a chemical change
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matter - solid
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a state of matter that has it's own shape and volume - it's particles (atoms) are close together.
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liquid - matter
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a state of matter that has volume but takes the shape of whatever container it is in - it's particles are not as close together as in a solid
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gas - matter
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a state of matter that does not have it's own shape or volume - it's particles are far apart and moving. They fill up the space around them.
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atoms are made up of
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protons, neutrons and electrons
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physical properties of matter
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an example is the boiling point or melting point or solid, liquid, gas
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chemical changes
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different from physical changes because a new substance may be formed. example - toasting a marshmallow (cooking) or corrosion.
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law of conservation of matter
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a chemical change doesn't change the amount of matter
(when the marshmallow burns some of the mass becomes water vapor and carbon dioxide gas) |
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Sublimation
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to change from a solid to a gas without becoming a liquid - water and carbon dioxide are two substances that can do this.
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