Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1...

16

TAGS:

Transcript of Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1...

Page 1: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.
Page 2: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.
Page 3: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Using Mass to Count Things

• Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter

• We use massmass to “count” atoms

Page 4: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Counting by mass

• a pile of nails weighs 1227 g

• one nail has mass of 0.450 grams

• How many nails are in pile?

1227g_____ = 2726.6 nails 0.450 g per nail

Page 5: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

What is a mole?

No, not this kind of mole!

http://news.bbc.co.uk/olmedia/1790000/images/_1794077_mole300.jpg
http://www.bird-x.com/products/images/moleBig.jpg
Page 6: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

The MOLE

• Unit used to “count” numbers of atoms– Count-by-mass technique

• Defined as # of atoms in 12.0 grams of C-12 – This is the STANDARD!

• 12.0 g of C-12 has 6.0221415 X 1023 atoms

Page 7: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Just how big is a mole?

Mole movie

http://www.youtube.com/watch?v=1R7NiIum2TI
Page 8: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

The MOLE

• 1 mole of any element has 6.02 X 1023 particles

• This is a really big number – It’s so big because atoms are really small!

Page 9: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

6.02 X 1023 = Avogadro’s Number

• One mole of water = 6.02 X 1023 water molecules

• One mole of gorillas = 6.02 X 1023 gorillas

• One mole of He atoms = 6.02 X 1023 He atoms

• One mole of anything = 6.02 X 1023 of that thing

Page 10: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Similar Words

• PairPair: 1 pair shoelaces = 2 shoelaces

• DozenDozen: 1 dozen oranges = 12 oranges

• GrossGross: 1 gross spider rings = 144 rings

• ReamReam: 1 ream paper = 500 sheets of paper

• MoleMole: 1 mole Na atoms

= 6.02 X 1023 Na atoms

Page 11: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.
Page 12: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12

=

• 6.02 X 1023 atoms of C-12

• 0.5 mole of C-12

=

• 6.0 grams of C-12

=

• 3.01 X 1023 atoms of C-12

Page 13: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12

=

• 6.02 X 1023 atoms of C-12

• 0.25 mole of C-12

=

• 3.0 grams of C-12

=

• 1.50 X 1023 atoms of C-12

Page 14: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Equalities

• 1 mole of C-12

=

• 12.0 grams of C-12 =

• 6.02 X 1023 atoms of C-12

• 2 moles of C-12

=

• 24.0 grams of C-12

=

• 12.04 X 1023 atoms of C-12 = 1.204 X 1024 atoms of C-12

How does this help with other elements?How does this help with other elements?

Page 15: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

Molar mass for any element:

• molar mass of any element:– take atomic mass and replace a.m.u. with grams

• 1 mole Ne = 20.179 g = 6.02 X 1023 atoms

• 1 mole Ar = 39.948 g = 6.02 X 1023 atoms

• 1 mole Kr = 83.80 g = 6.02 X 1023 atoms

Page 16: Using Mass to Count Things Atoms are so tiny it is impossible to count number of atoms in even 1 gram of matter massWe use mass to “count” atoms.

sliding scale of size

How small?

http://htwins.net/scale2/
http://ed.ted.com/lessons/just-how-small-is-an-atom

Nouns Count & Non-count

Nouns Count & Non-count

Before we can balance equations, we need to be able to count the atoms in a compound or molecule. Example: O 2 There are 2 atoms of oxygen in this molecule.

Before we can balance equations, we need to be able to count the atoms in a compound or molecule. Example: O 2 There are 2 atoms of oxygen in this molecule.

home/jason/Documents/Atoms Poster/Atoms plain · Title /home/jason/Documents/Atoms Poster/Atoms plain.sla Created Date: 20190913104152Z

home/jason/Documents/Atoms Poster/Atoms plain · Title /home/jason/Documents/Atoms Poster/Atoms plain.sla Created Date: 20190913104152Z

Atoms & Moles; Molar Mass & % Composition; … 6 Atoms & Moles; Molar Mass & % Composition; Formulas of Compounds A. Counting by Weighing • We can count objects by knowing how much

Atoms & Moles; Molar Mass & % Composition; … 6 Atoms & Moles; Molar Mass & % Composition; Formulas of Compounds A. Counting by Weighing • We can count objects by knowing how much

Steps for Balancing Equations 1.Write the skeleton equation Use arrows, +/- & physical states of matter 2. Count the atoms of the reactants 3. Count the.

Steps for Balancing Equations 1.Write the skeleton equation Use arrows, +/- & physical states of matter 2. Count the atoms of the reactants 3. Count the.

Make your Count, count

Make your Count, count

1 CHAPTER 2 Atoms, Molecules and Ions. 2 Atoms Each element composed of atoms All atoms of a given element are identical Atoms of an element.

1 CHAPTER 2 Atoms, Molecules and Ions. 2 Atoms Each element composed of atoms All atoms of a given element are identical Atoms of an element.

· Web viewCompounds and chemical equations involve simple numbers of atoms; unfortunately, atoms are too small to count. For example, to make table salt (sodium chloride, NaCl), we

· Web viewCompounds and chemical equations involve simple numbers of atoms; unfortunately, atoms are too small to count. For example, to make table salt (sodium chloride, NaCl), we

count non-count - quantifiers

count non-count - quantifiers

Chemistry. Atomic structure ATOMS, ATOMS, ATOMS!!!!!!!!

Chemistry. Atomic structure ATOMS, ATOMS, ATOMS!!!!!!!!

THE MOLE Unit 7. One way to measure how much substance available is to count the # of particles in that sample –However, atoms & molecules are extremely.

THE MOLE Unit 7. One way to measure how much substance available is to count the # of particles in that sample –However, atoms & molecules are extremely.

1 The MOLE. 2 Atoms and molecules are very, very small, but we still need to “count” them.

1 The MOLE. 2 Atoms and molecules are very, very small, but we still need to “count” them.

Atoms, Molecules and Ions Atoms, Molecules and Ions.

Atoms, Molecules and Ions Atoms, Molecules and Ions.

Electron Microscopes Used to count individual atoms What can electron microscopes tell us? Morphology – Size and shape Topography – Surface features (roughness,

Electron Microscopes Used to count individual atoms What can electron microscopes tell us? Morphology – Size and shape Topography – Surface features (roughness,

Chapter 2 Atoms, Molecules, & Ions. Atomic Theory Elements composed of atoms Atoms can’t be changed Compounds of multiple atoms John Dalton.

Chapter 2 Atoms, Molecules, & Ions. Atomic Theory Elements composed of atoms Atoms can’t be changed Compounds of multiple atoms John Dalton.

Using Moles to Count Atoms. Because chemists often deal with large numbers of small particles, they use a large counting unit—the abbreviated mol. Mole.

Using Moles to Count Atoms. Because chemists often deal with large numbers of small particles, they use a large counting unit—the abbreviated mol. Mole.

Quantitative Composition of Compounds Chapter 7. Avogadro’s Number How do we count atoms? –Dozens? Reams?

Quantitative Composition of Compounds Chapter 7. Avogadro’s Number How do we count atoms? –Dozens? Reams?

Electronic Structure of Atoms Electronic Structure of Atoms.

Electronic Structure of Atoms Electronic Structure of Atoms.

1 Atoms, Molecules and Ions. 2 Atoms Each element composed of atoms All atoms of a given element are identical Atoms of an element are not.

1 Atoms, Molecules and Ions. 2 Atoms Each element composed of atoms All atoms of a given element are identical Atoms of an element are not.

Count and Non count

Count and Non count