Name:________________________________Period:___________________________Date_______________________
Unit 2 review ©
1. Look at the models of the atom that have progressed over time, which scientist.
Thought it looked like a solid ball? _______________________________________
Thought it was a positive background with negative particles stuck in it? _____________________________
Discovered the nucleus and thought the atom was mostly empty space? _____________________________
Determined that electrons are arranged in specific energy fields? __________________________________
Discovered the neutron? ________________________________________
What does the current model of the atom look like? ________________________________________
2. What are the 3 particles an atom is made of? What is the electric charge of each? Mass of each?
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3. Look at the periodic table.
a. For the element oxygen (O) find the: # of protons # of neutrons and # electrons for an electrically neutral
atom.
# protons_____________
# neutrons____________
# electrons ___________
b. Draw the Bohr diagram for oxygen (if you don’t remember what a Bohr diagram is. Look back at the first
question) (remember the 2-8-8 rule)
c. If you added a neutron to this atom what would it be called? _________________________________
d. How would the atom become an oxygen ion? ______________________________________________
e. Is an oxygen ion positive or negative? Why? _________________________________________________
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f.
Could the atom have 9 protons and still be oxygen? Explain why or why not. _______________________
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Sulfur has 3 isotopes. Use the periodic table to find the Isotopic mass and % abundance of Sulfur-33
Isotopic Mass
Sulfur-32
Sulfur-33
Sulfur-34
31.972
???????????
33.967
% Abundance
94.93
??????????
4.29
4. Look at the periodic table again.
a. What are the all elements on the left of the zig zag line? _______________________________
b. What are the elements on the right? __________________________________
c. What are the elements that touch the line? _____________________________
What are the general properties of metals?
What are the general properties of non-metals?
What are the general properties of the main families? Which elements belong in each?
Alkali
Alkaline Earth
Halogen
Noble Gasses
What type of bonds are formed between metals and non-metals?_____________________________
What type of bonds are formed between non-metals and non-metals? _______________________________
When sodium bonds ionically with chlorine 1 electron is transferred. Explain why. ________________________________
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What is an element? __________________________________________________________________________________
What is a compound? _________________________________________________________________________________
What is a mixture? ___________________________________________________________________________________
Which of the above can you separate by physical means? (filtering, using your hands, using magnet, etc…)
What is a solution? ____________________________________________________________________
What is a saturated solution? ______________________________________________________________________
What is an unsaturated solution? ____________________________________________________________________
What is the formula to calculate the concentration of a solution?
An experiment requires a total of 600 mL solution of methyl alcohol and water with a 45% concentration. What volume of
methyl alcohol should be used?
Name the physical properties of substances.
Name the chemical properties of substances.
Water freezing is what type of change? Physical or chemical? Why? __________________________________________
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Paper burning is what type of change? Physical or chemical Why? __________________________________________
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What does a chemical change result in? _______________________________________________________________
What does the law of conservation of mass say? __________________________________________
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Balance the following:
Cl2 + NaBr --->
Na +
NaCl +
Br2
H2 + N2 --->
Br2 ---> NaBr
What are the 4 states of matter? _____________
NH3
CuCl2 + H2S ---> CuS +
_______________
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In which do the molecules move the fastest? _________________________________
What are the 6 phase changes? List which phase is changing to which for each.
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Draw a phase change diagram for water: Label the phases and phase changes
What does density measure? ___________________________
What is the formula for density? ________________________________________
HCl
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