Nuts and Bolts Lab Essays

706 Words Sep 15th, 2012 3 Pages
Nuts and Bolts

Purpose: The purpose of the lab is to correctly describe and distinguish samples and models of elements, compounds, and mixtures.

The lab asks you to examine conceptual models of matter in which atoms of one element are represented by nuts while atoms of another element are represented by bolts. After examining each model, complete the following tasks:
a. sketch a representative molecular picture of the model;
b. describe the composition of the model in words (does the model contain atoms, molecules, or both?; does the model represent elements, compounds, or both?; does the model represent a pure substance or a mixture?)
c. write the "chemical formula" of the model, using B as the symbol for a bolt and N
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3. How many names would you need if you were given a compound? Would you need to use "and" anywhere? You would need as many names as the elements from which atoms are chemically combined. You would not need to use and.

4. How many names would you need if you were given a mixture? Would you need to use "and" anywhere?
If you were given a mixture, you would need as many names as the substnaces you mixed, and you would use and.
5. Are atoms and molecules different, or these just two words that mean the same thing? Explain or give examples.
Molecules are a bond of two atoms, while and atom is the simplest form.
6. Are elements and compounds different, or are these just two words that mean the same thing? Explain or give examples.
A water molecule is made of 1 hydrogen and 2 oxygen atoms combined, but separated they are not water.

7. Elements and compounds are two kinds of pure substances, materials built of identical microscopic units. Give an example of (a) an element whose basic unit is an atom; (b) an element whose basic unit is a molecule; (c) a compound whose basic unit is a molecule. Is it possible to have a compound whose basic unit is an atom?
A) carbon - basic unit is an atom
B) hydrogen- basic unit is a molecule
C)

8. Draw a picture illustrating the difference between a homogeneous and heterogeneous mixture.

Data recording templates. Don't record data here, it goes in your lab notebook. Use charts like these to
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