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Freshman Chemistry Quiz

The document contains 11 multiple choice questions about general chemistry concepts such as the atomic model, empirical formulas, limiting reagents, and chemical reactions. Specifically, it tests knowledge of J.J. Thomson's cathode ray experiment, Rutherford's gold foil experiment, identifying the charges of subatomic particles, calculating empirical formulas from combustion reactions, determining limiting reagents and excess amounts in chemical equations.

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53 views2 pages

Freshman Chemistry Quiz

The document contains 11 multiple choice questions about general chemistry concepts such as the atomic model, empirical formulas, limiting reagents, and chemical reactions. Specifically, it tests knowledge of J.J. Thomson's cathode ray experiment, Rutherford's gold foil experiment, identifying the charges of subatomic particles, calculating empirical formulas from combustion reactions, determining limiting reagents and excess amounts in chemical equations.

Uploaded by

misganamarcos10
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Adama Science and Technology University

Division of Freshman Program (Pre-Engg)


Quiz-1- General Chemistry
Course Code: Chem1101
Max. Marks- 10 Max Time- 30 Mins.
Q1. J.J. Thomson proved that cathode rays were beams of _____.
(A) alpha particles
(B) atoms
(C) electrons
(D) oil droplets

Q2. What experiment provided evidence for Thomson's atomic model?


(A) The gold foil experiment
(B) The cathode ray tube experiment
(C) The nuclear magnetic resonance experiment
(D) The electron diffraction experiment

Q3. In Rutherford’s gold foil experiment, some of the alpha particles passed straight through
the gold foil, completely undeflected. What could Rutherford conclude from this
observation?
(A) Alpha particles have a positive charge.
(B) Electrons have a positive charge.
(C) The atom is made up of mostly empty space.
(D) There must be a small, positively charged dense area within the atom.

Q4. Which of the following has a positive charge?


(A) proton
(B) neutron
(C) anion
(D) electron
(E) atom

Q5. A sample of a hydrocarbon was combusted producing 1.054 g of CO2 and 0.2168 g of
H2O. What is the empirical formula for the hydrocarbon?
(A) C1H1
(B) C1H2
(C) C2H2
(D) C2H1

Q6. Which of the following is NOT an empirical formula?


(A) C6H14O
(B) C6Na2O6
(C) C14H8O5
(D) C4H8N3
Q7. What is the empirical formula for a compound that contains 37.69% Na and 62.31 %
Fluorine?
(A) NaF3
(B) Na2F
(C) NaF
(D) NaF2

Q8. If the reaction of 125 grams of C6H6O3 reacts in excess of oxygen (O2) and produces 51
grams of H2O, what is the percent yield?
(A) 80%
(B) 85%
(C) 101%
(D) 95%

Q9. An oxide of lead contains 90.65% Pb, by weight. The empirical formula is:
(A) Pb
(B) PbO
(C) Pb3O4
(D) Pb2O3
(E) PbO2

Q10. Silicon nitride (Si3N4) is made by combining Si and nitrogen gas (N2) at a high
temperature. How much (in g) Si is needed to react with an excess of nitrogen gas to prepare
125 g of silicon nitride if the percent yield of the reaction is 95.0%?
(A) 89 g
(B) 79.1
(C) 75 g
(D) 90.8 g

Q11. In the following reaction-


O3 + NO → O2 +NO2
200 g of O3 is treated with 400 g of NO. Calculate-
(a) Which of the two reactants is the limiting reagent?
(b) Calculate the mass of NO2 formed.
(c) How much excess reagent (in gram) is left at the end of the reaction?

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