Unit 3 Review #2

Chemistry
Unit 3 Review #2

Review concepts, vocabulary, and calculations from Unit 3.1 - 3.3.
This incudes: Fundamental Forces and Particles, Components of the Atom, Electron Spin, Mass Numbers and Neutrons, Standard Nuclear Notation, Ions, Isotopes, Atomic Mass, Mass Spectrometry, Abundance and Average Atomic Mass, Energy, Light, and the Bohr Model

Word Cloud

What is your favorite ski location?

Math Response

If a hydrogen atom's electron moves from level 1 to level 3, that means a photon with a wavelength of 103 nm impacted the electron. What is the frequency of that photon in Hz? Express your answer in scientific notation.

Type answer here

Correct Answer: 2.91\times10^{15}

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Multiple Choice

What part of the electromagnetic spectrum does the previously-calculated frequency, $$2.91\times10^{15\ }Hz$$ , fall into?

• Microwave

• Infrared (IR)

• Visible

• Ultraviolet (UV)

Math Response

Using the calculated frequency (Hz) from the previous question, $$2.91\times10^{15}\ Hz$$ ; how much energy (J) does this photon have? Express your answer in scientific notation.

Type answer here

Correct Answer: 1.93\times10^{-18}

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Word Cloud

Who will win the Stanley Cup this year?

Dropdown

A spectrometer detects a photon emitted from a hydrogen atom with a frequency of $$6.1686\times10^{14\ }Hz$$

What energy level did this electron move from and where did it end up?​

Select answer

​ ​

Math Response

A skier burns about 493 calories per hour of skiing. This is the equivalent of 412,200 J of energy. If a hydrogen atom emits a photon as its electron transitions from energy level 5 to energy level 2, how much energy does that photon have? Express your answer in Joules (J) and in scientific notation.

Type answer here

Correct Answer: 4.58\times10^{-19}

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Multiple Choice

How many electrons are present in this ion?

• 19

• 20

• 21

• 22

Multiple Choice

What type of ion is this?

• Anion

• Cation

• Negative

• Positron

Word Cloud

What's been your favorite part of chemistry so far?

Multiple Choice

How many neutrons are present in this ion?

• 20

• 21

• 24

• 45

Math Response

What is the average atomic mass, or atomic weight, of silicon? Ensure your answer has the correct number of significant figures!

Type answer here

Correct Answer: 28.09

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Math Response

Given the isotopic composition of gallium, find the abundance (in percent) of gallium-71.

Type answer here

Correct Answer: 39.889

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