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Describing Matter

Chapter 2 Section 1

Matter Anything that has mass and occupies space
Chemistry The study of the properties of matter and how matter changes.
Substance A single kind of matter that is pure and has a specific set of properties.
Physical Property A characteristic of a pure substance that can be observed without changing it into anothee substance.
Chemical Property A characteristic of a pure substance that describes its ability to change into a different substance.
Element A pure substance that cannot be broken down into other substances by chemical or physical means.
Atom The basic particles from which all substances are made.
Chemical bond The force that holds atoms together.
Molecule A neutral particle made of two or more atoms joined by covalent bonds.
Compound A pure substance made of two or more substances chemically combined.
Chemical Formula A combination of symbols that represents the elements in a compound and their proportions.
Mixture Two or more substances that are mixed together but not chemically combined.
Heterogeneous Mixture A mixture in which pure substances are unevenly distributer throughout the mixture.
Homogeneous Mixture A mixture in which substances are evenly distributed throughout the mixture.
Solution A well-mixed mixture containing a solvent and at least one solute that has the same properties throughout.
What must you do in order to observe a chemical property of a substance? try to change the substance to another substance.
What is a molecule? A particle made up of two or more atoms held together by chemical bonds.
What information does a chemical formula tell you about a compound? A chemical formula shows the elements in the compound and the ratio of atoms.
what is the difference between physical properties and chemical properties? Physical properties can be observed without changing pure substances into other substances. Chemical properties can be observed only by changing pure substances intoother substances.
A metal melts at 450C. Is this property of the metal classified as chemical or physical? Explain your choice. Melting point is a physical property because the metal is still the same substance, it is only changing form.
Helium does not react with ant other substance. Is it accurate to say that helium has no chemical properties? Explain. No. The fact that helium does not react with any other substance is a chemical property because it describes helium's ability to change (or not change) into different substances.
How are elements and compounds similar? How do they differ? Bothe elements and compounds are pure substances. While elements are not made of simpler substances, compounds are made up of two or more elements.
How does a heterogeneous mixture differ from a homogeneous mixture? You can see the different parts of a heterogeneous mixture, but substances in a homogeneous mixture are so thoroughly mixed that you cannot see them.
Why is it correct to say that seawater is a mixture? Seawater is a mixture made up of salt, water, and many other substances.
Created by: Tom Radeke