Released Questions

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ReleasedQuestions
ReleasedQuestions

• Chemistry
• CA Standards Test

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Measure temperature
Measure heat
Measure color of light
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Observation ? Hypothesis ? Theory ? Law
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(The Atomic Theory) A well-accepted idea.
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Refer to your Periodic Table
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Chemical Families act the same.
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Noble gases are the hardest to pull an electron
off of.
Alkali metals (Li, Na, K) are the easiest atoms
to pull an electron off of.
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Family 6 has 6 valence electrons.
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Most particles missed the nucleus
A few alpha particles hit something small and
very dense!
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single-atom
The Diatomic Elements HONClBrIF or BrINClHOF
Cl2 F2 He N2
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The examples contain C, N, H, O nonmetals with
nonmetals
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Use your Periodic Table Same family as Silicon
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Volume decreases x2 Pressure increases x2
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At STP, 1.0 mole 22.4 L So, half a mole 11.2
L The answer is STP (T273 K P1.00 atm)
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K -273 ºC 423 - 273
Remember, no calculator The answer is NOT
negative.
And 423 273 ? 696!
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Hint Read the question before looking at the
table of information
These mix very well so you can dissolve alcohol
in water or water in alcohol!
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Like Dissolves Like Polar solutes dissolve in
polar solvents. Nonpolar solutes dissolve in
nonpolar solvents. Polar and nonpolar do not mix
(e.g. oil H2O).
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A Proportion! If 36.2 g dissolves in 100 g of
H2O, How much dissolves in 50 g of H2O?
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Hint If the math confuses you, try each answer
until you find the right one.
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ppm is related to
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From the formula sheet
Heat mass x (change in Temp) x specific heat
30 g (40.0ºC) (0.4 J/g ºC) 30 (4)(4)
J 120 x 4 480 J
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HCl NaOH ? H2O NaCl (salt water) Salt water
is neutral!
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Ours looked more like this
Which answer is NOT an electrolyte?
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Nope bases are slippery.
Nope acids bases form salts.
Nope they become less acidic they get
neutralized!
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Acidic Low pH Basic High pH
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Le Châtelier's Principle
Reactants
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Products
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Increase pressure decrease in volume
2?1
Not enough room switch to the side that takes up
less room (fewer moles of gas)
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Add heat shift left
Add liquid no change
Shift left make O2
Fewer moles of gas on the right. 5 ? 2
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Shift right use up CO
No change 2 ? 2
Shift left use up NO
Shift right make CO2
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H2O(l) ? H2O(g)
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4
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CH3CH2OH is C2H6O C2H6O 3O2 ? 2CO2 3H2O
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Molar mass of carbon-12 12.00 g/mole
Or 12 grams 1 mole so 6 grams .5 moles
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Look up Pt on the Periodic Table
Approximate 195 g 1 mole so 97.6 g .5 mole
1 mole 6.02 x 1023 atoms so .5 mole 3.01 x
1023 atoms!
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Translate 6.02 x 1023 1 mole 1.2 x 1024 2
moles
1 mole CO2 and 2 moles H2O are formed.
Use P.O.E. Process Of Elimination
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Molar Mass of CH4 12.0 4.0 16.0 g/mole
Hint Again if the math is too much try each
answer out.
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52 g Cr 6.02 x 1023 atoms 13 g Cr ¼ x 6.02 x
1023 atoms 1.5 x 1023 atoms
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1 Fe2O3 2(55.85) 3(16.00) 112 48 160
grams
3 CO 3(12.0 16.0) 3(28) 84 grams
So 160 grams Fe2O3 is needed to react with 84
grams of CO!
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6(216) 6(18) 60 48 108 grams
2(143) 2(17) 34 grams
108 g H2O ? 34 g NH3 so 54 g H2O ? 17 g NH3
Hint The numbers have to be simple because you
wont have a calculator.