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LET’S REVIEW!
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Periodic Table1. Where are metals located?2. Where are nonmetals?3. What are elements in the following
groups called:a. 8Ab. 7Ac. 1Ad. 2A
4. Where are transition metals located?
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Writing Compound Formulas
5. What is “oxidation number”?6. What are the oxidation numbers for
common ions formed by the following elements:
a. Hb. Oc. S
7. What are the oxidation numbers for the following polyatomic ions (see p.919?):
a. NH4b. NO3
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Writing Compound Formulas8. Write the formulas for
compounds formed by the following ions:
a. H+ + O-2
b. NH4+1 + S-2
c. Ti+4 + NO2-1
9. Now NAME those compounds.
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Types of Chemical Reactions10. Identify the TYPE of chemical
reactions shown AND name all the compounds in each equation (remember the list of polyatomic ion names on p.919):
a. Fe + Cl2 → FeCl3
b. NH4NO3 → N2O + H2Oc. Li + H2O → LiOH + H2
d. NaOH + CuCl2 → NaCl + Cu(OH)2
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Writing Chemical Equations11. What do following signs and
symbols mean in a chemical equation:
a. →b. (s)c. (l)d. (g)e. (aq)
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Writing Chemical Equations (continued)
Write a word equation for putting together a made-from-scratch cake.
Example of a chemical word equation from your Chemical Changes lab:
Copper (II) nitrate + sodium hydroxide → copper (II) hydroxide + sodium nitrate
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Writing Chemical Equations (continued)
The skeleton equation of this word equation is:
Cu(NO3)2 + NaOH → Cu(OH)2 + NaNO3
What is the law of conservation of matter?
Skeleton equations APPEAR to have a gain or loss of matter – they are not balanced.
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Writing Chemical Equations (continued)
Balanced equations have the same number of each type of element on each side of the equation, obeying the law of conservation of mass:
Cu(NO3)2 + 2NaOH → Cu(OH)2 + 2NaNO3