Unit 2 Atoms Formative 2025--BHS

Last updated 2 days ago

35 questions

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Library

Unit 2 Atoms Formative 2025--BHS

Last updated 2 days ago

35 questions

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Draggable item		Corresponding Item

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Strontium consists of four isotopes with masses of 84.045 (abundance of 0.500%), 86.23 (abundance of 9.90%), 87.452 (abundance of 7.00%), and 87.963 (abundance of 82.6%). Calculate the atomic mass of strontium in amu. Round to FOUR significant figures.

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What is the average atomic mass of Cesium with three common isotopes: 75.0% 133Cs with a mass of 132.97 g/mol, 20.0% 132Cs with a mass of 131.98 g/mol, and 5.00% 134Cs with a mass of 133.982 g/mol? Round to FOUR significant figures.

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How many atoms are present in 415.7 g of manganese?

Include correct significant figures, unit, and element symbol in your final answer.

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What is the mass of 6.83 moles of hydrogen?

Include correct significant figures, unit, and element symbol in your final answer.

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Calculate the number of moles present in 365 g of beryllium.

Include correct significant figures, unit, and element symbol in your final answer.

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How many atoms are present in 1.080 moles of gallium?

Include correct significant figures, unit, and element symbol in your final answer.

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How many moles are present in 4.88x1024 atoms of aluminum?

Include correct significant figures, unit, and element symbol in your final answer.

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What is the mass of 4.62x1022 atoms of cobalt?

Include correct significant figures, unit, and element symbol in your final answer.

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Match the following terms with the appropriate definition.

Draggable item		Corresponding Item
Atom		A regular atom in it's lowest energy state
Isotope		States that matter cannot be created or destroyed
Excited State		Energy is given off when light strikes a metal object
Frequency		The state in which electrons have moved out of their normal energy levels and have more energy
Wavelength		The number of waves that pass a gicen point in one second
Electromagnetic Radiation		The number of protons in an atom
Electron		Positively charged subatomic particle found in the nucleus of an atom
Mass number		The distance from crest to crest or trough to trough of a wave
Atomic Number		The equivalent of 6.022x10^23
Mole		The sum of protons and neutrons
Law of Conservation of Mass		Negatively charged subatomic particles that are very small and found surrounding the nucleus of an atom
Hertz		A different form of an element that contains a different number of neutrons but has the same atomic number
Ground State		A form of energy that travels through space as waves at the speed of light
Photoelectric effect		The unit for frequency
Photon		the smallest unit of an element
Proton		Units of light energy

Microwaves have higher energy than infrared waves.

True

False

The nucleus is comprised of positive protons and negative electrons.

True

False

Photons are emitted when an electron returns to ground state.

True

False

As wavelength increases, frequency and energy will decrease.

True

False

Red light has a shorter wavelength than ultraviolet light.

True

False

According to Dalton's theory, as it was originally published, atoms cannot be created, destroyed, or subdivided.

True

False

J.J. Thomson's use of the Cathode ray tube led to the discovery of the proton.

True

False

The law of definite proportions states that the composition of a pure substance is always the same regardless of the source.

True

False

Match the scientist with the correct contribution to the Atomic Theory.

Draggable item		Corresponding Item
Erwin Schrodinger		Used the gold-foil experiment to prove that the nucleus of an atom is very small and positively charged.
Ernst Rutherford		Used a cathode ray tube to show that the beam (electrons) must have a negative charge.
Robert Millikan		Developed an equation that treated electrons in atoms like waves.
Neils Bohr		Electrons have wave-like behavior and had specific frequencies.
J.J. Thomson		State that the nucleus is charged and surrounded by electrons that travel in fixed orbits as planets orbit the sun.
Louis De Broglie		State that electrons are lighter than protons and neutrons by using an atomizer to spray oil.

Strontium consists of four isotopes with masses of 84.045 (abundance of 0.500%), 86.23 (abundance of 9.90%), 87.452 (abundance of 7.00%), and 87.963 (abundance of 82.6%). Calculate the atomic mass of strontium in amu. Round to FOUR significant figures.

What is the average atomic mass of Cesium with three common isotopes: 75.0% 133Cs with a mass of 132.97 g/mol, 20.0% 132Cs with a mass of 131.98 g/mol, and 5.00% 134Cs with a mass of 133.982 g/mol? Round to FOUR significant figures.

How many atoms are present in 415.7 g of manganese?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 6.83 moles of hydrogen?

Include correct significant figures, unit, and element symbol in your final answer.

Calculate the number of moles present in 365 g of beryllium.

Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 1.080 moles of gallium?

Include correct significant figures, unit, and element symbol in your final answer.

How many moles are present in 4.88x1024 atoms of aluminum?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 4.62x1022 atoms of cobalt?

Include correct significant figures, unit, and element symbol in your final answer.

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1

Use a fraction to put mass number over atomic number before the element symbol.

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Use a fraction to put mass number over atomic number before the element symbol.

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Required

1

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1

Use a fraction to put mass number over atomic number before the element symbol.

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1

Required

1

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Match the following terms with the appropriate definition.

Atom

A regular atom in it's lowest energy state

Isotope

States that matter cannot be created or destroyed

Excited State

Energy is given off when light strikes a metal object

Frequency

The state in which electrons have moved out of their normal energy levels and have more energy

Wavelength

The number of waves that pass a gicen point in one second

Electromagnetic Radiation

The number of protons in an atom

Electron

Positively charged subatomic particle found in the nucleus of an atom

Mass number

The distance from crest to crest or trough to trough of a wave

Atomic Number

The equivalent of 6.022x10^23

Mole

The sum of protons and neutrons

Law of Conservation of Mass

Negatively charged subatomic particles that are very small and found surrounding the nucleus of an atom

Hertz

A different form of an element that contains a different number of neutrons but has the same atomic number

Ground State

A form of energy that travels through space as waves at the speed of light

Photoelectric effect

The unit for frequency

Photon

the smallest unit of an element

Proton

Units of light energy

Microwaves have higher energy than infrared waves.

True

False

The nucleus is comprised of positive protons and negative electrons.

True

False

Photons are emitted when an electron returns to ground state. 

True

False

As wavelength increases, frequency and energy will decrease.

True

False

Red light has a shorter wavelength than ultraviolet light.

True

False

According to Dalton's theory, as it was originally published, atoms cannot be created, destroyed, or subdivided.

True

False

J.J. Thomson's use of the Cathode ray tube led to the discovery of the proton.

True

False

The law of definite proportions states that the composition of a pure substance is always the same regardless of the source.

True

False

Match the scientist with the correct contribution to the Atomic Theory.

Erwin Schrodinger

Used the gold-foil experiment to prove that the nucleus of an atom is very small and positively charged.

Ernst Rutherford

Used a cathode ray tube to show that the beam (electrons) must have a negative charge.

Robert Millikan

Developed an equation that treated electrons in atoms like waves.

Neils Bohr

Electrons have wave-like behavior and had specific frequencies.

J.J. Thomson

State that the nucleus is charged and surrounded by electrons that travel in fixed orbits as planets orbit the sun.

Louis De Broglie

State that electrons are lighter than protons and neutrons by using an atomizer to spray oil.

Unit 2 Atoms Formative 2025--BHS

Unit 2 Atoms Formative 2025--BHS

Strontium consists of four isotopes with masses of 84.045 (abundance of 0.500%), 86.23 (abundance of 9.90%), 87.452 (abundance of 7.00%), and 87.963 (abundance of 82.6%). Calculate the atomic mass of strontium in amu. Round to FOUR significant figures.

What is the average atomic mass of Cesium with three common isotopes: 75.0% 133Cs with a mass of 132.97 g/mol, 20.0% 132Cs with a mass of 131.98 g/mol, and 5.00% 134Cs with a mass of 133.982 g/mol? Round to FOUR significant figures.

How many atoms are present in 415.7 g of manganese?Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 6.83 moles of hydrogen?Include correct significant figures, unit, and element symbol in your final answer.

Calculate the number of moles present in 365 g of beryllium.Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 1.080 moles of gallium?Include correct significant figures, unit, and element symbol in your final answer.

How many moles are present in 4.88x1024 atoms of aluminum?Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 4.62x1022 atoms of cobalt?Include correct significant figures, unit, and element symbol in your final answer.

Match the following terms with the appropriate definition.

Microwaves have higher energy than infrared waves.

The nucleus is comprised of positive protons and negative electrons.

Photons are emitted when an electron returns to ground state.

As wavelength increases, frequency and energy will decrease.

Red light has a shorter wavelength than ultraviolet light.

According to Dalton's theory, as it was originally published, atoms cannot be created, destroyed, or subdivided.

J.J. Thomson's use of the Cathode ray tube led to the discovery of the proton.

The law of definite proportions states that the composition of a pure substance is always the same regardless of the source.

Match the scientist with the correct contribution to the Atomic Theory.

Strontium consists of four isotopes with masses of 84.045 (abundance of 0.500%), 86.23 (abundance of 9.90%), 87.452 (abundance of 7.00%), and 87.963 (abundance of 82.6%). Calculate the atomic mass of strontium in amu. Round to FOUR significant figures.

What is the average atomic mass of Cesium with three common isotopes: 75.0% 133Cs with a mass of 132.97 g/mol, 20.0% 132Cs with a mass of 131.98 g/mol, and 5.00% 134Cs with a mass of 133.982 g/mol? Round to FOUR significant figures.

How many atoms are present in 415.7 g of manganese?Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 6.83 moles of hydrogen?Include correct significant figures, unit, and element symbol in your final answer.

Calculate the number of moles present in 365 g of beryllium.Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 1.080 moles of gallium?Include correct significant figures, unit, and element symbol in your final answer.

How many moles are present in 4.88x1024 atoms of aluminum?Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 4.62x1022 atoms of cobalt?Include correct significant figures, unit, and element symbol in your final answer.

Use a fraction to put mass number over atomic number before the element symbol.

Use a fraction to put mass number over atomic number before the element symbol.

Use a fraction to put mass number over atomic number before the element symbol.

Use a fraction to put mass number over atomic number before the element symbol.

Use a fraction to put mass number over atomic number before the element symbol.

Use a fraction to put mass number over atomic number before the element symbol.

How many atoms are present in 415.7 g of manganese?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 6.83 moles of hydrogen?

Include correct significant figures, unit, and element symbol in your final answer.

Calculate the number of moles present in 365 g of beryllium.

Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 1.080 moles of gallium?

Include correct significant figures, unit, and element symbol in your final answer.

How many moles are present in 4.88x1024 atoms of aluminum?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 4.62x1022 atoms of cobalt?

Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 415.7 g of manganese?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 6.83 moles of hydrogen?

Include correct significant figures, unit, and element symbol in your final answer.

Calculate the number of moles present in 365 g of beryllium.

Include correct significant figures, unit, and element symbol in your final answer.

How many atoms are present in 1.080 moles of gallium?

Include correct significant figures, unit, and element symbol in your final answer.

How many moles are present in 4.88x1024 atoms of aluminum?

Include correct significant figures, unit, and element symbol in your final answer.

What is the mass of 4.62x1022 atoms of cobalt?

Include correct significant figures, unit, and element symbol in your final answer.