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Unit 3 lesson 5
Terms in this set (28)
A pure substance made of only one kind of atom
Different kinds of atoms that have been chemically combined; have different properties than the elements that make them up
A combination of two or more elements that are not chemically combined
Examples of Elements
Oxygen, Nitrogen, Carbon
Examples of compounds
water, carbon dioxide, salt
Examples of mixtures
Air; sugar-water; salad; bag of M&M's
Shiny, conduct heat and electricity well, can be shaped into thin sheets and wires
Where are metals located on the periodic table?
do not conduct heat or electricity well; not shiny
Where are nonmetals located on the periodic table?
have some properties of both metals and nonmetals
Where are metalloids located on the periodic table?
in the middle
a substance that has definite physical properties such as appearance, melting point and reactivity; cannot be broken down by physical changes like melting, freezing, breaking
3 ways compounds can be classified
organic/inorganic; pH (acidic or basic); by their role in the body
What is the pH value of acids?
What is the pH value of bases?
greater than 7
What is the pH value of substances that are neutral?
used as a source of energy; includes sugars, starches and fiber
store excess energy in the body and make up all cell membranes
one of the most abundant types of compounds in the body; regulate chemical activities and build and repair body structures
DNA and RNA; contain genetic information and help the body build proteins
does not have a uniform composition
substances are spread evenly throughout
What is an example of a heterogeneous mixture?
a soil sample
What is an example of a homogeneous mixture?
sugar water; milk
a heterogeneous mixture that separates into layers over time (ex: contents of a snow globe)
homogeneous mixtures (ex: tea, sugar water, air; alloys of brass and steel)
A heterogeneous mixture of intermediate sized particles; (ex: milk, gelatin)
THIS SET IS OFTEN IN FOLDERS WITH...
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