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CHEM 280 MIDTERM EXAM AND CHEM 280 FINAL EXAM PRACTICE TESTS WITH 300 REAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS (EXPERT VERIFIED SOLUTIONS TO ALL CALC PROBLEMS AND FORMULAS SHOWN) $29.99
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CHEM 280 MIDTERM EXAM AND CHEM 280 FINAL EXAM PRACTICE TESTS WITH 300 REAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS (EXPERT VERIFIED SOLUTIONS TO ALL CALC PROBLEMS AND FORMULAS SHOWN)
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CHEM 280 MIDTERM EXAM AND CHEM 280 FINAL EXAM PRACTICE TESTS WITH 300 REAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS (EXPERT VERIFIED SOLUTIONS TO ALL CALC PROBLEMS AND FORMULAS SHOWN) 1. Molarity = Moles / Volume 2. Moles = Mass / Molar Mass Moles 9 is also 9 x 10^-3 Milli Moles 3. p...

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  • September 22, 2024
  • 109
  • 2024/2025
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CHEM 280 MIDTERM EXAM AND CHEM 280 FINAL
EXAM PRACTICE TESTS WITH 300 REAL EXAM
QUESTIONS WITH CORRECT DETAILED ANSWERS
(EXPERT VERIFIED SOLUTIONS TO ALL CALC
PROBLEMS AND FORMULAS SHOWN)


Chem 280 midterm exam practice qs
These are all the formulas you need to know to succeed!
1. Molarity = Moles / Volume
2. Moles = Mass / Molar Mass
Moles 9 is also 9 x 10^-3 Milli Moles
3. pH = -log x Cation
4. H3O x OH = 1 x 10^-14
5. Total Mass = Solute + Solvent
6. Mass Percent = Solvent Mass / Total Mass x 100
7. Total Pressure - Partial Pressures = Remaining Pressure
8. P1 x V1 / T1 = P2 x V2 / T2
9. Molar Mass = G/Mol
10. Specific Heat = Energy / (Mass x Temp)
11. V1 / T1 = V2 / T2
12. M1 x V1 = M2 x V2
13. Percent Yield = Actual Yield / Theoretical Yield


What is the molarity of a solution prepared by dissolving 10.7 g NaI in 0.250 L?
0.286
Molarity (M) = Number of Moles of solute / Liters solution
- How many moles represent 10.7 g of NaI?
NaI = 22.9 g/mol + 126.90 g/mol = 149.8 g/mol




pg. 1

,Exactly 17.0 mL of a H2SO4 solution was required to neutralize 45.0 mL of 0.235
M NaOH. What was the concentration of the H2SO4 solution?

Given: H2SO4 (aq) + 2NaOH (aq) → 2H2O (l) + Na2SO4 (aq)
0.311 M
Molarity = Concentration

H2SO4 (aq) + 2NaOH (aq) → 1:2 (NaOH 2mol당 H2So4 1mol)




In the following reaction:
HCO3- (aq) + H2O (aq) → H2CO3 (aq) + OH- (aq)
H2O is an acid and OH- is its conjugate base.




How many carbon atoms are in the formula Al2(CO3)3?


a. 6
b. 3
c. 1
d. 9none of the above - ANSWER-b. 3


pg. 2

,A fictional element has two naturally occurring isotopes with the natural
abundances shown here:
ISOTOPE
18
40.0%
ABUNDANCE
20
60.0%
Which statement is TRUE for this element?


a. The atomic mass would be less than 18.
b. The atomic mass would be exactly 19.
c. The atomic mass would be greater than 20.
d. The atomic mass would be closer to 20 than to 18.
e. The atomic mass would be closer to 18 than to 20. - ANSWER-d. The atomic
mass would be closer to 20 than to 18.


Which of the following is a molecular compound?


a. barium sulfide
b. calcium acetate
c. potassium hydroxide
d. nitrogen monoxide
e. none of the above - ANSWER-d. nitrogen monoxide




pg. 3

, Which statement reflects the results of Rutherford's gold foil experiments?


a. Almost all of the alpha particles sputtered gold atoms off of the surface of the
foil.
b. Almost all of the alpha particles were deflected back in the direction from which
they came.
c. Almost all of the alpha particles passed directly through the foil.
e. Almost all of the alpha particles were deflected while passing through the foil.
f. none of the above - ANSWER-c. Almost all of the alpha particles passed directly
through the foil.


Which of the following is NOT a correct name, symbol combination?


a. iron, Fe
b. phosphorus, P
c. beryllium, Be
d. manganese, Mg
e. silicon, Si - ANSWER-d. manganese, Mg


Which statement below accurately describes the contributions of Thomson?


a. created the modern periodic table
b. proposed the modern Atomic Theory
c. discovered the existence of electrons
d. ancient Greek philosopher who proposed that matter was continuous
e. none of the above - ANSWER-c. discovered the existence of electrons



pg. 4

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