Lesson 2 Flashcards

1
Q

Atomic mass is the mass of an atom expressed in atomic mass units or amu.
- 1amu = 1/12 the mass of the carbon - 12 atom
– Another name for the amu is the Dalton (Da)

A

Atomic mass is the mass of an atom expressed in atomic mass units or amu.
- 1amu = 1/12 the mass of the carbon - 12 atom
– Another name for the amu is the Dalton (Da)

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2
Q

Avogadro’s number may be used to count any kind of particle, including atoms, ions, molecules, electrons, etc.
- it is abbreviated mol
– The mole is the SI (metric) unit for the number of particles (amount) in a sample

A

Avogadro’s number may be used to count any kind of particle, including atoms, ions, molecules, electrons, etc.
- it is abbreviated mol
– The mole is the SI (metric) unit for the number of particles (amount) in a sample

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3
Q

Scientists needed a common substance to define the mole:

A mole is defined as the number of atons in exactly 12 grams of carbon- 12

A

Scientists needed a common substance to define the mole:

A mole is defined as the number of atons in exactly 12 grams of carbon- 12

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4
Q

A useful property of a substance is its molar mass

The molar mass of a substance (element or compound) is the mass in grams of one mole in the substance

Molar mass has the unit grams per mole ( g/mol)

A

A useful property of a substance is its molar mass

The molar mass of a substance (element or compound) is the mass in grams of one mole in the substance

Molar mass has the unit grams per mole ( g/mol)

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5
Q

One-mole quantities of two different substances have different masses for the same reason - the substances have different compositions.

A

One-mole quantities of two different substances have different masses for the same reason - the substances have different compositions.

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6
Q

Recall that each atom of carbon 12 has a mass of 12 amu

A

Recall that each atom of carbon 12 has a mass of 12 amu

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7
Q

An atom of hydrogen-1 has a mass approx 1 amu, one twelfth the mass of a carbon-12 atom.

A

An atom of hydrogen-1 has a mass approx 1 amu, one twelfth the mass of a carbon-12 atom.

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8
Q

The noninteger values occur because the values are weighted averages of the masses of all the naturally occurring isotopes of each element.

A

The noninteger values occur because the values are weighted averages of the masses of all the naturally occurring isotopes of each element.

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9
Q

the mass of one mole of carbon-12 atoms is 12g.

A

the mass of one mole of carbon-12 atoms is 12g.

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10
Q

The mass in grams of one mole of any pure substance is called its

A

The mass in grams of one mole of any purse substance is called its molar mass

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11
Q

The molar mass of any element is numerically equal to its atomic mass and has the units g/mol.

A

The molar mass of any element is numerically equal to its atomic mass and has the units g/mol.

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