Chemistry

Chemistry Quiz

Created by Faiz Izzuddin

Gentle Reminder!

There are total of 12 questions in this quiz. Questions from chapter 1, 2 and 4. Make sure to answer it correctly. Good luck to all of you.

Multiple Choice

1. How to determine nucleon number? (Basic knowledge)

• Number of protons + Number of electrons

• Number of protons + Number of neutrons

• Number of electrons + Number of neutrons

• Number of protons - Number of neutrons

• I don't care about that.

Multiple Choice

2. Two naturally occurring isotopes of element A are ₁₉₁A and ₁₉₃A in the ratio of 5:8 respectively. Calculate the average atomic mass of A. (Chapter 1.1)

• 192.23

• 191.77

• 191.77 amu

• 192.23 amu

• What is it so hard?

Multiple Choice

3. Calculate the molarity of an aqueous solution of sodium chloride, NaCl with molality of 13.76 m and density of 1.03 g mL^-1. (Chapter 1.2)

• 0.785

• 14.17

• 7.85

• 17.61

• I have no calculator.

Multiple Choice

4. In the formation of urea, (NH₂)₂CO, 2.5 mole of NH₃ are allowed to react with 3.0 mole of CO₂ as the following equation:

2NH₃ (g) + CO₂(g) → (NH₂)₂CO (aq) + H₂O (l)

Calculate the mass of (NH₂)₂CO formed. (Chapter 1.3)

• 180 g

• 300 g

• 75 g

• 150 g

• I don't know.

Multiple Choice

5. A line with a wavelength of 97.2 nm was observed in the Lyman series of the emission spectrum of hydrogen. Calculate the energy emitted for this transition. (Chapter 2.1)

• 2.04 x 10^-27 J

• 4.89 x 10^-18 J

• 4.89 x 10^-26 J

• 2.04 x 10^-18 J

• I have no idea.

Multiple Choice

6. Which are the following is d_xy orbital? (Chapter 2.2)

• Why there are so many pictures?

Multiple Choice

7. Choose the correct electronic configuration of ₂₄Cr. (Chapter 2.3)

• 1s²2s²2p⁶3s²3p⁶4s²3d⁵

• 1s²2s²2p⁶3s²3p⁶4s¹3d⁵

• 1s²2s²2p⁶3s²3p⁶3d⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d⁴

• This question is so confusing.

Multiple Choice

8. Which of the following is the right Lewis structure for aluminium flouride, AlF₃? (Chapter 4.1)

• I'm losing my mind right now.

Multiple Choice

9. All of the following are basic shapes for Lewis structures EXCEPT _________. (Chapter 4.2)

• Trigonal Bipyramidal.

• Trigonal Planar.

• Trigonal Pyramidal.

• Tetrahedral.

• Me.

Multiple Choice

10. Which of the following statement is CORRECT about pi,π bond. (Chapter 4.3)

• π bond formed from the overlapping sideway of s orbital and p orbital.

• π bond formed from the overlapping of s orbital and p orbital.

• π bond formed from the overlapping end to end of two p orbital.

• π bond formed from the overlapping sideway of two p orbital.

• Nothing I can say.

Multiple Choice

11. Deduce why ethanol, CH₃CH₂OH dissolve in water. (Chapter 4.4)

• Ethanol can form hydrogen bond between their molecules and water molecules.

• Ethanol can form van der Waals forces between their molecules and water molecules.

• Ethanol can form hydrogen bond between their molecules.

• Density of water is higher than density of ethanol.

• I cannot even guess the answer.

Multiple Choice

12. What is metallic bond? (Chapter 4.5)

• Electrostatic attraction between the positively charged metal ions and the "sea of delocalized" valence electrons.

• Dispersion forces are caused by the motion of electron in a molecule or atom.

• Attractive force between polar molecules.

• Force between polar molecules which have partially positive H atom bonded to highly electronegative atom N, O or F.

• I don't recognize it.

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