Chemical Reactions, Chemical Reactions

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precipitate
Solid compound produced from 2 liquids during a chemical reaction. Sign of a chemical reaction.
bubbles
Gas given off during a chemical reaction; may or may not have an odour. Sign of a chemical reaction.
signs of a chemical reaction
change in temperature, formation of bubbles, precipitate forms, color change, change in smell, difficult to reverse
subscript
Number written after and BELOW an element in a chemical formula telling you how many of the preceding element are needed for that compound or molecule.
chemical equation
Written representation of a chemical reaction/chemical change; shows all the reactants and products. Always in the form of: Reactants arrow Products.
chemical change
Chemical reaction; when substances interact with each other. Original substances are used up.
physical change
When a substance changes its phase (changes to a solid, liquid , gas, or plasma) or is modified (size, shape, etc) but remains the same substance.
compound
Any amount of a chemical combination of 2 or more different atoms.
molecule
A chemical combination of 2 or more nonmetals held together by covalent bonds
chemical reaction
the process by which one or more substances change to produce one or more different substances
chemical equation
a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products
reactants
things that react together (on the left side of the equation)
products
things that are produced (on the right side of the equation)
2, 1, 2
__Na + __F₂ → __NaF
balanced
__MgO + __SO₃ → __MgSO₄
1, 3, 2, 3
__Al₂(SO₄)₃ + __Ca(OH)₂ → __Al(OH)₃ + __CaSO₄
coefficient
numbers written to balance a chemical equation in front of the element or compound
conservation of mass
mass is neither created or destroyed, which is why we balance chemical reactions
3, 2, 2, 3
__Al + __Cu(NO₃)₂ --> __Cu + __Al(NO₃)₃
1, 2, 1, 1
__Mg + __HF → __MgF₂ + __H₂
3, 2, 3, 2
__Mg + __AlCl₃ → __MgCl₂ +__Al
synthesis reaction
a single product is produced
decomposition reaction
a single reactant breaks down to form multiple products
combustion reaction
a hydrocarbon and oxygen react to form carbon dioxide and water
single replacement
an element and an ionic compound react to form a new element and a new ionic compound
double replacement
two ionic compounds react and form two new ionic compounds (a precipitate forms)
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