The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic...

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The The Mole Mole Unit 3

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Transcript of The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic...

Page 1: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

TheTheMoleMole

Unit 3

Page 2: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• So far we have been dealing with numbers on the atomic scale…– Atomic Number = # of protons– Mass Number = # of protons + # of

neutrons– Atomic Mass = # of amu in one

average atom

Page 3: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• This is a really small scale.• Is it logical to try to measure out

chemicals for labs this way?

• NO!

• We need a bigger scale to use for everyday measurements and calculations.

Page 4: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• We need…

• The MOLE!

• The MOLE is a unit of measure – a unit of “how many”.

Page 5: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• Just like a dozen eggs tells us “how many” eggs, a mole tells us “how many” particles.

• 1 dozen eggs = 12 eggs

• 1 mole = 6.02 x 1023 particles– Particles can be anything –

atoms, molecules, eggs, etc.

Page 6: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• This number (6.02 x 1023) is called Avogadro’s Number, in honor of Amedeo Avogadro’s contributions to chemistry.

• Unfortunately for him, his ideas weren’t really recognized as important until after he died.

Page 7: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• But wait, where did we get this number?

• Scientists have found that there is exactly 1 mole of atoms in the atomic mass of an element when that mass is expressed in grams.

• Huh?

Page 8: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• For example:

• What is the atomic mass of C-12?

• (Hint – there is only one isotope here, so think mass number)

• Atomic mass = 12 amu

Page 9: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• Then express that mass in grams 12 g

• In exactly 12 grams of C-12, there is one mole (6.02 x 1023) of atoms.

• This also works for our average atomic masses (from the periodic table).

Page 10: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• So, in exactly 12.01 g of natural carbon there are 6.02 x 1023 atoms.

• AND, 6.02 x 1023 atoms = 1 mole. So 1 mole of carbon = 12.01 g.

• Hmm…..those sounds suspiciously like conversion factors…

• Time for examples!

Page 11: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• How many atoms are in 1.00 mole of gold?

1.00 mole Au 6.02 x 1023 atoms

1 mole =

6.02 x 1023 Atoms Au

Page 12: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• How many molecules are in 2.00 moles of water?

2.00 mole H2O 6.02 x 1023 molecules

1 mole =

1.20 x 1024 MoleculesH2O

Page 13: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• How many marbles are in 1.00 mole of marbles? (Enough to cover the entire Earth to a depth of 50 miles!)

1.00 mole marbles 6.02 x 1023 marbles

1 mole =

6.02 x 1023 marbles

Page 14: The Mole Unit 3 The Mole So far we have been dealing with numbers on the atomic scale… –Atomic Number = # of protons –Mass Number = # of protons + #

The MoleThe Mole

• How many grams are in 1.00 mole of neon?

1.00 mole Ne 6.02 x 1023 atoms

1 mole Ne

= 20.2 g Ne

6.02 x 1023 atoms

20.18 g Ne


Protons, neutrons and electrons are with different properties · Protons, neutrons and electrons are sub-atomic particles with different properties: Sub-atomic particle Charge Mass

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Atoms / Elements Different number of protons Protons found in nucleus # of protons = atomic number Since atom is electrically neutral: #protons = # electrons.

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Atomic Number Number of Protons. Mass Number Number of Protons + Neutrons.

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Basic chemistry ○ Atomic structure Nucleus = protons (positive) + neutrons (neutral) .

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Electrons Chemistry Dr. May Atomic Inventory Protons (Atomic Number) Neutrons (Atomic Mass minus Protons) Electrons (Same number as protons)

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Symbols. Atomic Number- No. of protons Atomic Mass – No. of protons and neutrons (electron mass negligible) Chemical symbols found on Periodic table.

Symbols. Atomic Number- No. of protons Atomic Mass – No. of protons and neutrons (electron mass negligible) Chemical symbols found on Periodic table.

The nucleus consists of protons and neutrons, collectively called nucleons. The number of protons is the atomic number. Protons plus neutrons is the atomic.

The nucleus consists of protons and neutrons, collectively called nucleons. The number of protons is the atomic number. Protons plus neutrons is the atomic.

CHEMISTRY!REVIEW!faculty.mtsac.edu/mpresch/36_documents/Anat 36 CHem Review.pdfElements = every specific type of atom Atomic number: # protons Atomic mass: #protons + # neutrons

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The Atomic Theory. The Atom Protons and Neutrons.

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Atomic number = # of protons = # of electrons (neutral atom)

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Physical Science Mr. Bythwood Protons (+): Atomic Number Neutrons: Atomic Mass minus Protons Electrons (-): Same number as Protons.

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The Chemistry of Life · Atomic Number •The number of protons in an atom determines the atom’s atomic number. •For example, an element with the atomic number 2 has 2 protons,

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Atomic Structure Protons, Neutrons, and Electrons Section 4.3.

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Protons Identify an Element/atom (2 protons = Helium) Protons + Neutrons = Atomic Mass/Weight ( 2 Protons + 2 Neutrons = 4 AMU ) Chemical Properties

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Nutritional Biochemistry - DPHU · Nutritional Biochemistry— CONTINUED Oxygen ¾ Chemical symbol is O ¾ Atomic number is 8 (8 protons) ¾ Atomic mass is 16 (8 protons + 8 neutrons)

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Atomic Structure BASIC INFORMATION. atoms are made up of: protons (+ charge) neutrons (no charge) electrons (- charge) atomic number = # protons Lithium’s.

Atomic Structure BASIC INFORMATION. atoms are made up of: protons (+ charge) neutrons (no charge) electrons (- charge) atomic number = # protons Lithium’s.

Nuclear Chemistry College Chemistry. Isotope Notation the number of protons Atomic Mass Atomic Number protons + neutrons.

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Atomic Physics Atomic Notation A X Z X – symbol of the atom Z – atomic number (no of protons) A – mass number 14 C 6 C – carbon Z = 6, the number of protons.

Atomic Physics Atomic Notation A X Z X – symbol of the atom Z – atomic number (no of protons) A – mass number 14 C 6 C – carbon Z = 6, the number of protons.

Speedy protons and the puzzling atomic nucleus

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