Elec. Conf. Day 2

Multiple Choice

Why is the study of electron energy and light spectra important in understanding atomic structure and chemical behavior?

• It helps explain why atoms bond to form molecules.

• It reveals how elements emit unique patterns of light.

• It determines the physical size of atoms.

• It predicts the melting point of elements.

Multiple Select

Which of the following statements about energy levels and electron transitions are correct?

• Electrons can absorb energy and move to higher energy levels

• Electrons release energy when they fall to lower energy levels

• The greater the fall, the more energy is released

• Electrons emit light when moving to higher energy levels

Multiple Choice

What causes an electron to leave its ground state and jump to an excited state?

• Absorption of a photon

• emission of a photon

• absorption of an electron

• Emission of an electron

Question Video: Identifiying a gas using its emission spectrum | NagwaQuestion Video: Identifiying a gas using its emission spectrum | Nagwa

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Multiple Choice

The unknown emissions spectra belongs to the element

• Hydrogen

• Mercury

• Neon

• Sodium

Multiple Choice

Which of the following statements about the black lines in an absorption spectrum is correct?

• They indicate wavelengths where photons are absorbed by a substance.

• They indicate wavelengths where photons are emitted by a substance.

• They indicate wavelengths where no photons exist in the universe.

• They indicate wavelengths where light is reflected.

Multiple Choice

What is the main difference between absorption spectra and emission spectra as shown in the diagrams?

• Absorption spectra show dark lines where light is absorbed, while emission spectra show bright lines where light is emitted.

• Absorption spectra show bright lines where light is emitted, while emission spectra show dark lines where light is absorbed.

• Both spectra show only bright lines.

• Both spectra show only dark lines.

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Multiple Choice

Which step in the procedure ensures that the nichrome wire is clean before testing each solution?

• Heating the wire in the hot burner flame and dipping it into hydrochloric acid

• Adding a small amount of HCl into the wells

• Writing the number of your unknown solution into the table

• Leaving the solutions in the microwell for the next class

Multiple Select

Select all the correct steps involved in preparing the wells for the flame test experiment.

• Add a small amount of HCl into the first row of wells

• Clean the nichrome wire before each test

• Record the color of the flame for each solution

• Pour all solutions down the sink after the experiment

Open Ended

Explain the steps you would take to determine the identity of an unknown metallic solution using the flame test procedure and the provided table.

Multiple Choice

What is the purpose of using HCl in the flame test procedure?

• To clean the nichrome wire between tests

• To provide a color reference

• To react with the metallic solutions

• To fill the empty wells

Multiple Choice

Which of the following is NOT a step in writing an electron configuration?

• Write the row you are in

• Write down the region (s, p, d, or f)

• Identify the number of protons

• Use a superscript to identify the number of block you pass

Open Ended

Explain how the periodic table helps in determining the electron configuration of an element.

Multiple Choice

Which of the following is the correct electron configuration for sodium (Na)?

• 1s2 2s2 2p6 3s1

• 1s2 2s2 2p6 3p1

• 1s2 2s2 2p6 4s1

• 1s2 2s2 2p6 3s2

Multiple Choice

Which of the following sublevels correspond to n-1 in the periodic table?

• d-block

• s-block

• p-block

• f-block

Open Ended

Explain how electron movement between energy levels leads to the production of photons and how this relates to the light spectra observed for different elements.