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Science C. 3 7th
Chemical Reactions, lessons 1 & 2
Question | Answer |
---|---|
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 |