Chemistry Tutor Competency Quiz
- 1.Which of the following statements describes the difference between endothermic and exothermic chemical reactions?
- A.
Energy is conserved in endothermic reactions but is not conserved in exothermic reactions.
- B.
Endothermic reactions involve changes in the nucleus of an atom, but exothermic reactions do not involve changes in the nucleus.
- C.
Energy is absorbed in endothermic reactions but is released in exothermic reactions.
- D.
Endothermic reactions occur when electrons are shared between atoms, but exothermic reactions occur when electrons are transferred between atoms.
- 2.Which of the following is an intensive property?
- A.
Mass
- B.
Volume
- C.
Density
- D.
Length
- 3.Which physical method of separating mixtures would you use to separate colors in a dye?
- A.
Chromatography
- B.
Separating funnel
- C.
Centrifugation
- D.
Simple distillation
- 4.The process of splitting atoms is called ____________.
- A.
Nuclear fusion
- B.
Nuclear fission
- C.
Radioactive decay
- D.
None of the above
- 5.Molecular Orbital Theory describes the respective bond orders in H₂ , H₂ + , and H₂ – as _____________.
- A.
1, 0, and 0
- B.
1, 0, and ½
- C.
1, ½, and ½
- D.
1, ½, and 0
- 6.A triple bond consists of _________________.
- A.
Three sigma bonds
- B.
One sigma and two pi bonds
- C.
Three pi bonds
- D.
Two sigma and one pi bond
- 7.The proper name for N₂O₅ is _______________.
- A.
Nitrogen pentoxide
- B.
Dinitrogen pentoxide
- C.
Nitrous oxide
- D.
Pentaoxidgen dinitride
- 8.Which list of formulas represents compounds, only?
- A.
CO₂, H₂O, NH₃
- B.
H₂, N₂, O₂
- C.
H₂, Ne, NaCl
- D.
MgO, NaCl, O₂
- 9.Mass of an empty container = 3.0 grams Mass of the container plus the solid sample = 25.0 grams Volume of the solid sample = 11.0 cubic centimeters The data above were gathered in order to determine the density of an unknown solid. The density of the sample should be reported as
- A.
0.5 g/cm3
- B.
0.50 g/cm3
- C.
2.0 g/cm3
- D.
2.00 g/cm3
- 10.If 87.5 percent of a sample of pure 131I decays in 24 days, what is the half-life of 131I?
- A.
6 days
- B.
8 days
- C.
12 days
- D.
14 days
- 11.Body temperature is 98.6°F. What is the temperature in °C?
- A.
32 degrees
- B.
37 degrees
- C.
39 degrees
- D.
40 degrees
- 12.Which equation represents an oxidation reduction reaction?
- A.
CH₄ + 2O₂ ==> CO₂ + 2H₂O
- B.
H₂SO₄ + Ca(OH)₂ ==> CaSO₄ + 2H₂O
- C.
MgCrO₄ + BaCl₂ ==> MgCl₂ + BaCrO₄
- D.
Zn(NO₃)₂ + Na2CO₃ ==> 2NaNO₃ + ZnCO₃
- 13.A single protron has what electrical charge?
- A.
No Charge
- B.
Positive Charge
- C.
Negative Charge
- D.
Either a Positive or Negative Charge
- 14.
What is the fourth most abundant element in the universe in terms of mass?- A.
Sodium
- B.
Boron
- C.
Helium
- D.
Carbon
- 15.How many moles of solid Ba(NO3)2 should be added to 300. milliliters of 0.20-molar Fe(NO3)3 to increase the concentration of the NO3¯ ion to 1.0-molar? (Assume that the volume of the solution remains constant.)
- A.
0.060 mole
- B.
0.12 mole
- C.
0.24 mole
- D.
0.30 mole
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