Vocabulary
Matter is...
anything that has mass and takes up space.
Every form of matter has two kinds of properties- physical and chemical properties.
True
What is the difference between chemical properties and physical properties?
Physical properties can be observed without changing pure substances in other substances.
Chemical properties can be observed only by changing pure substances into other substances
Chemistry is...
the study of the properties of matter and how matter changes.
Atoms are the simplest substances.
False. Elements are the simplest substances.
A metal melts at 450 degrees Celius. Is this property of the metal classified as chemical or physical?
Melting point is a physical property because the metal is still the same substance, it is only changing form.
Substance is..
a single kind of matter that is pure and a specific set of properties.
When elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements.
True
Helium does not react with any other substance. Is it accurate to say that helium has no chemical properties? Explain
No. Helium does not react with any other substance is a chemical property because it describes helium's ability to change (or not to change) into different substances.
Element is..
A pure substance that cannot be broken down into any other substances by chemical or physical means.
Each substance is a mixture combined property. Also, the parts of a mixture are combined in a set ratio.
False. Each substance is a mixture of individual properties. Also, the parts of a mixture are not combined in a set ratio.
How are elements and compounds similar? How do they differ?
Both elements and compounds are pure substances. Elements are the simplest substances, compounds are substances made up of 2 or more elements.
a pure substance made of two or more elements chemically combined and the ratio of atoms.
A carbon dioxide molecule is made up of 4 oxygen atoms and 2 carbon atoms.
False. A carbon dioxide molecule is made up of 2 oxygen and 1 carbon atom.
Plants make a sugar compound with the formula C6H1206. What elements make up this compound?
Carbon, Hydrogen, and Oxygen