Understanding Chemical Reactions Crossword Puzzle

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QUESTIONS LIST:

reaction: a process where substances change to form new substances.
combustion: a reaction where a substance burns in oxygen to release energy.
oxidation: a reaction where oxygen is added to a substance.
precipitate: an insoluble solid formed in a chemical reaction.
mass: this is always conserved in a chemical reaction.
decomposition: a reaction where one substance breaks down into simpler substances.
fuel: a substance burned in combustion to release energy.
flammable: a hazard symbol for something that catches fire easily.
atom: the smallest unit of an element, rearranged in reactions.
symbol: used to represent elements in a chemical equation.
energy: released or absorbed during a chemical reaction.
solid: the state of matter often formed in precipitation reactions.
gas: often released during combustion and some decomposition reactions.
triangle: part of the model for combustion; it includes fuel, oxygen, and heat.