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33 Cards in this Set
- Front
- Back
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Properties of a substance that describe how it changes while being coverted into a different substance is known as __ __.
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chemical properties
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A __ __ takes place when two or more substances unite or break apart chemcially
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chemical change
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A chemical change often results in a change in ___.
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color
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An __ is the simplest type of substance.
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element
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The smallest particles of matter are called ____.
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atoms
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(True/False) An element cannot be broken down to anything smaller than one particular kind of atom.
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True
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A ___ is a new substance formed from the chemical union of two or more elements.
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compound
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How do compounds differ from each other?
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Compounds differ by the ratio of atoms joined together in the compound.
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A __ shows a fixed relationship between two things.
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ratio
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What does a chemical formula show?
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The symbol of the chemicals and how many atoms of each the compound has.
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What is the chemical formula for water?
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H20 - means 2 atoms of hydrogen and 1 atom of oxygen
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The process of forming a chemical bond is known as a __ __.
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chemical reaction
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A chemical reaction always involves a ___ ___.
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chemical change
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What ancient Greek came up with the idea that matter should be made up of small particles?
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Democritus
Demo-cri-tus |
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The word atom comes from the word "atomos" which means _____________.
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"impossible to cut apart"
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In 1981 ___ and ___ took pictures of the atom.
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Binnig & Rohrer
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The core of the atom is known as the ____.
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nucleus
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The core of the atom contains ___ and _____.
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protons and neutrons
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A ____has a positive electric charge.
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protons
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The number of protons found in the nucleus of an atom is known as the __ ___ of the atom.
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atomic number
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How do atoms differ?
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Atoms differ from one another by the number of protons in their nuclei.
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A ___ is 1,840 times the mass of an electron.
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proton
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______ have negative electic charge.
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Electrons
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_____ have NO electric charge.
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neutrons
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_____ ____ is a "short cut" to writing out extremely large numbers.
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Scientific notation
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The __ ___ of an element is approximately equal to the sum of the number of protons and neutrons found in the nucleus.
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atomic mass
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# of protons + # of neutrons =
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atomic mass
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The orbit of the electrons is the ____.
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shell
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The first shell of an atom can hold ___ electrons.
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2 electrons
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The second shell of an atom can hold ___ electrons.
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8 electrons
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A ______ atom has an equal number of electrons and protons.
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stable atom
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Two or more atoms that are chemically unit form a ___.
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molecule
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The __ __ of an element always starts with a capital letter and the second letter is lower case.
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upper
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