Science - Chemical Reactions Unit Vocabulary
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25 Terms
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proton
proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
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neutron
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
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atoms
the tiny pieces that all matter—all the stuff in the world—is made of
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chemical reaction
chemical reaction
a process in which atoms rearrange to form new substances
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corrosive
corrosive
able to cause damage
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fertilizer
fertilizer
a substance that is added to soil to help plants grow
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model
an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
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molecule
molecule
a group of atoms joined together in a particular way
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product
an ending substance that is made during a chemical reaction
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property
property
something that can be observed about a substance, such as color, smell, or boiling point
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reactant
a starting substance that is part of a chemical reaction
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rearrange
rearrange
to change the order or position of something
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scale
scale
the relative size of things
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substance
substance
something that is made of all the same atoms or groups of atoms
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electron
electron
a negatively charged subatomic particle
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combustion reaction
combustion reaction
a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light
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Law of Conservation of Mass
Law of Conservation of Mass
Matter is not created nor destroyed in any chemical or physical change
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boiling point
boiling point
the temperature at which a substance changes from the liquid phase to the gas phase
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chemical formula
chemical formula
letters and numbers showing the types and number of atoms that repeat to make up a substance
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extended structure
extended structure
a structure formed by repeating groups of atoms that link together in a large network
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melting point
melting point
the temperature at which a substance changes from the solid phase to the liquid phase
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valence electrons
valence electrons
the electrons in the outermost orbital or shell of an atom
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atomic mass
atomic mass
the number of neutrons and protons in an atom
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atomic number
atomic number
the number of protons in an atom
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precipitate
precipitate
A solid that forms from a solution during a chemical reaction.
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