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10 Cards in this Set

  • Front
  • Back
Give at least five elements that have been known since ancient times.
antimony, carbon, cooper, gold, iron, lead, mercury, silver, sulfur and tin.
Compare 'stable' elements with 'reactive'.
Stable elements do not easily combine with other elements and are often found in their pure form in nature.

Reactive elements readily form compounds and therefore are not normally found in their pure form in nature.
What elements is represented by the symbol K? H? N?
K-potassium H-hydrogen N-nickel
Which is more complex, an atom or a molecule? Why?
Molecules are more complex because they consist of two or more atoms bonded to one another.
How is a diatomic molecule different from other two-atom molecules?
Diatomic molecules consist of atoms of the same element.
(i.e. O(2) Cl(2) as compared to HCL or CO)
How many atoms are represented by the chemical formula MgSO(4)?

How many elements?
MgSO(4) consists of six atoms and three elements.
How does a compound differ from a mixture?
Compounds contain elements that are chemically bonded together. A mixture consists of two or more pure substances (elem. or comp.) mixed together without a chemical reaction taking place. The substances often can be separated through non chemical means.
If a suger-water mixture is 10% sugar by mass, what substance composes the ret of the mixture and what is the percentage of that substance by mass?
Water is 90% of the mixture.
How is a homogeneous mixture different from a heterogeneous mixture?
A homogeneous mixture is a uniform combo of two or more substances; no matter how small the size.

A heterogeneous mixture will exhibit distinct phases of the constituents in even the smallest sample (i.e. milk, blood...)
Explain how the Tyndall effect helps us to analyze mixture.
The Tyndall effect occurs when light is scattered in a colloidal mixture by the relatively large particles dispersed in the medium. In a true solution, the light cannon be seen because the particles are too small to scatter light.