General Chemistry Final Review

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.

What is the average atomic mass of this element?

• 74.92 amu

• 24.97 amu

• 75.01 amu

• 74.51 amu

4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?

• 41.97 amu
• 42.19 amu
• 10.43 amu
• 40.04 amu

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NGSS.MS-PS1-1

Calculate the average atomic mass of silver.

• 106.38649amu
• 111.91896amu
• 107.8677amu
• 121

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NGSS.HS-PS1-7

What number of particles can be different in isotopes of any given element?

• Protons

• Neutrons

• Electrons

• All remain constant

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NGSS.HS-PS1-8

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

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NGSS.HS-PS1-8

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

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NGSS.HS-PS1-8

A common infrared laser operates at 1.06 x 10³ nm. What if the energy of a photon of light with this wavelength?

• 7.02 x 10^-40 J

• 6.25 x 10^-28 J

• 3.54 x 10^-15 J

• 1.87 x 10^-19 J

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

The frequency of violet light is 7.5x10¹⁴ Hz. What is its wavelength?

• 4.0x10^-7 m

• 4.0x10⁷ m

• 2.25x10²³m

• 2.25x10²³ Hz

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NGSS.HS-PS4-1

Red light has a wavelength of 675 x 10^-9 m. What is its frequency?

• 2.03x10¹¹ m

• 4.44x10¹⁴ Hz

• 4.44x10¹⁴ nm

• 2.03x10¹¹ Hz

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NGSS.HS-PS4-1

The two elements formed in Big Bang Nucleosynthesis where __________________.

• hydrogen and lithium
• hydrogen and helium
• hydrogen and oxygen
• helium and lithium

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NGSS.HS-ESS1-2