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Science C. 3 7th

Chemical Reactions, lessons 1 & 2

Anything that has mass and takes up space. matter
The study of matter and how matter changes. chemistry
A characteristic of a substance that can be observed without changing the substance into another substance. physical property
A characteristic of a substance that describes its ability to change into other substances. chemical property
Any change that alters the form or appearance of a substance but that does not make the substance into another substance physical change
A change in matter that produces one or more new substances is a _______________. chemical reaction or chemical change
A solid that forms from solution during a chemical reaction. precipitate
A reaction in which energy is absorbed. endothermic reaction
A reaction that releases energy in the form of heat. exothermic reaction
A short, easy way to show a chemical reaction, using symbols instead of words. chemical equations
The substances you have at the beginning of an equation. reactants
When the reaction is complete, you have new substances called the ____________. products
principle that states that during a chemical reaction, matter is not created or destroyed. conservation of mass
In an _____________________, matter can enter from or escape to the surroundings. open system
In a _____________, matter is not allowed to enter or leave. closed system
A number placed in front of a chemical formula in an equation. coefficient
When two or more elements or compounds combine to make a more complex substance, the process is called __________. synthesis
Breaks down compounds into simpler products. decomposition
When one element replaces another in a compound, or when two elements in different compounds trade places, the process is called ______________. replacement
Created by: jenniferstaton