Chemistry Unit Review Worksheet
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1Name : __________________ Science- 8 Period __________ Date: _______________________
Chemistry Unit Review
1. The atomic number for Phosphorous is 15. What does this tell you about Phosphorous?
2. What is the number of neutrons in a neutral atom of Rubidium?
3. Describe the most reactive and least reactive families of the Periodic Table of Elements.
4. How many valence electrons exist in an electrically neutral atom of Aluminum? What does
this tell you about the Boron Family that contains Aluminum?
5. Describe possible evidence that would suggest that a chemical change has occurred?
6. How many protons are in one molecule of NH
? How many protons would there be in two
4
molecules of NH
?
4
7. Describe the chemical formula: 4NaHCO
3.
8. List and describe the 3 subatomic particles of an atom. Include location, mass, and
charge.
9. Name 3 elements that have similar chemical properties to Cesium.
10. Explain why a chemical equation must be balanced.
11. What are the reactants in the following chemical equation:
O
+ C
H
O
CO
+ H
O + energy
2
6
12
6
2
2
12. How many atoms are in in one molecule of C
H
O
?
6
12
6
13. Describe a chemical formula? Why is a chemical formula used in Science?
14. Define the following words: atom, element, molecule, compound.
15. In the following chemical equation balanced: 6O
+ C
H
O
3CO
+ 4H
O?
2
6
12
6
2
2
16. List the following information about Potassium: atomic number, symbol, atomic mass,
number of protons, number of electrons, number of neutrons, number of valence
electrons, the group number, and the period number.
17. Draw a Bohr model of the element Silicon.
18. Define the following terms:
atomic mass
compound -
molecule -
proton –
atomic
electron –
neutron –
reactants –
number –
electron cloud –
nucleus –
valence electrons –
Bohr model –
element -
products –
Make sure you can do the following on the test:
• Draw a Bohr model of any of the elements in the first three periods of the Periodic Table
of Elements
• Be able to determine an element from a model
• Describe the implications of the Law of Conservation of Mass
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