Ms. Ward 8 th Grade Science. Classifying Matter: Elements, Compounds, and Mixtures. (1) The chemical formula for a substance called sodium nitrate is NaNO 3 . What elements make up sodium nitrate?
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Ms. Ward 8th Grade Science
(1) The chemical formula for a substance called sodium nitrate is NaNO3. What elements make up sodium nitrate?
A. sodium and nobelium B. sodium and nitrogen C. nitrogen and nobelium D. sodium, nitrogen, and oxygen
(2) Which of the following compounds contains the greatest number of atoms? A. CO2 B. C22H46 C. C6H12O6 D. CH4
During this class, you will describe the difference between elements and compounds.
A combination of two or more pure substances that are not chemically combined.
substances held together by physical forces, not chemical
No chemical change takes place
Each item retains its properties
in the mixture
They can be separated physically
You will be shown a series of photos. Tell if each photo represents an item composed of an element, compound, or mixture.
An element contains just one type of atom.
A compound contains two or more different atoms joined together.
A mixture contains two or more different substances that are only physically joined together, not chemically.
A mixture can contain both elements and compounds.
During this class period, you described the difference between elements and compounds.
What is an element?
What is a compound?
Tomorrow, you willdemonstrate your knowledge on common chemical symbols and formulas and describe the difference between elements and compounds. (DOK 2, 2a)