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Science Crossword Puzzle

Across
Energy contained in a system that is responsible for temperature
A Reaction in which energy is released by matter
The end result of a conversion
A Reaction in which energy is absorbed by matter
Has a definite shape and volume
Average kinetic energy in a substance
Down
Study of energy changes that occur in chemical systems
Takes the shape of its container and has a definite volume
Anything that has mass and takes up space
Simplest unit of a chemical compound
smallest particle of an element
Substances that under go a change during a reaction