atoms and compounds ics iii week 4. how to read the periodic table
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Atoms and CompoundsAtoms and Compounds
ICS IIIICS III
Week 4Week 4
How to read the Periodic TableHow to read the Periodic Table
All Atoms Have MassAll Atoms Have MassMass numberMass number
The total number of protons and The total number of protons and neutrons in an elementneutrons in an element
Each proton and neutron have an Each proton and neutron have an average mass of about 1 amu (atomic average mass of about 1 amu (atomic mass unit)mass unit)
6 protons and 6 neutrons6 protons and 6 neutrons 12.01 or 1212.01 or 12
Atomic Mass UnitAtomic Mass UnitA weighted average mass of the A weighted average mass of the
atoms in a naturally occurring atoms in a naturally occurring samplesample
Practice with mass numbersPractice with mass numbers
What is the mass number for Sodium?What is the mass number for Sodium?22.99 or 2322.99 or 23
What is the mass number for Oxygen?What is the mass number for Oxygen?16.00 or 1616.00 or 16
What is the mass number for Hydrogen?What is the mass number for Hydrogen?1.01 or 11.01 or 1
Elements vs. CompoundsElements vs. Compounds
ElementElementSimplest form of matter.Simplest form of matter.Can not be broken downCan not be broken down
CompoundCompoundSubstance that contains two or more Substance that contains two or more
elements chemically combined in a fixed elements chemically combined in a fixed proportionproportion
Element vs. CompoundElement vs. Compound
OOThe element oxygenThe element oxygenOO22
The compound dioxide (two oxygen)The compound dioxide (two oxygen)Contains 2 oxygen elements bonded togetherContains 2 oxygen elements bonded together
Element vs. CompoundElement vs. Compound 2 Hydrogen elements (H) + 1 Oxygen (O) element 2 Hydrogen elements (H) + 1 Oxygen (O) element
HH22OO
1 Carbon elements (C) + 2 Oxygen (O) element 1 Carbon elements (C) + 2 Oxygen (O) element COCO22
How to find the molecular mass of How to find the molecular mass of a compounda compound
Molecular MassMolecular MassMolecular WeightMolecular Weight
All matter has All matter has mass, or weightmass, or weight
The sum of the The sum of the atomic masses of atomic masses of the atoms of each the atoms of each elementelement
•What is the molecular weight of CO2?
How to find the atomic mass of a How to find the atomic mass of a compoundcompound
COCO22
1 Carbon atom1 Carbon atom1 x 12 = 121 x 12 = 12
2 Oxygen atoms2 Oxygen atoms2 x 16 = 322 x 16 = 32
COCO22
12 + 32 = 4412 + 32 = 44
How to find the atomic mass of a How to find the atomic mass of a compoundcompound
Find the atomic mass of HFind the atomic mass of H22O.O.1818
Find the atomic mass of NaCl.Find the atomic mass of NaCl.5858
Find the atomic mass of CFind the atomic mass of C66HH1212OO66..180180
Mass of compoundsMass of compounds
16 17 18 36 2
Amount vs. WeightAmount vs. WeightSubstanceSubstance amountamount unitsunits weightweight
ApplesApples 1 dozen1 dozen 1212 555 grams555 grams
DonutsDonuts 1 dozen1 dozen 1212 250 grams250 grams
FeathersFeathers 1 dozen1 dozen 1212 5 grams5 grams
BricksBricks 1 dozen1 dozen 1212 10,000 g10,000 g
•What do all these substances have in common??
•Amount…… 1 dozen or 12 units
•Conversion factor?????????
•What is different about all these substances???
•The weight….
MoleMole
The number of atoms in 12 grams of The number of atoms in 12 grams of carbon-12.carbon-12.
The atomic mass of an element is the The atomic mass of an element is the weighted average of the mass of one mole weighted average of the mass of one mole of its atomsof its atoms
1 mole of a compound = atomic mass of 1 mole of a compound = atomic mass of the compoundthe compound
((MolMolar Mass)… ar Mass)… Mole Mass… Mass of one mole of compoundMole Mass… Mass of one mole of compound
What is a mole?What is a mole?
For example, the relative atomic mass of carbon is 12, so one mole of carbon atoms weighs 12 grams.
What is the mass of one mole of hydrogen atoms?
The term mole is used to talk about mass. One mole of a
substance is its relative atomic mass, or relative formula mass, in grams.
Molar MassMolar Mass
The atomic mass of an element or The atomic mass of an element or compound expressed in grams per molecompound expressed in grams per mole
Atomic mass goes hereAtomic mass goes here
CONVERSION FACTORCONVERSION FACTOR
Moles and MassMoles and Mass 1 mole of ______ has a molar mass of . . . . . . 1 mole of ______ has a molar mass of . . . . . .
2 grams of Hydrogen gas (H2 grams of Hydrogen gas (H22) = 1 mole of Hydrogen gas (H) = 1 mole of Hydrogen gas (H22))
16 g/mol 17 g/mol 18 g/mol 36.5 g/mol 2 g/mol
What is the mass of one mole?What is the mass of one mole?
MolesMoles
Beaker of WaterBeaker of WaterMass of water is 18 gMass of water is 18 gHow many moles??How many moles??
1 mole1 mole1 mole H1 mole H22O = 18 gO = 18 g
MolesMoles
Beaker of HClBeaker of HClMass of HCl is 36 gMass of HCl is 36 gHow many moles??How many moles??
1 mole1 mole1 mole HCl = 36 g1 mole HCl = 36 g
1 mole
18 g
1 mole
36 g
Amount vs. WeightAmount vs. WeightSubstanceSubstance amountamount unitsunits weightweight
ApplesApples 1 dozen1 dozen 1212 555 grams555 grams
DonutsDonuts 1 dozen1 dozen 1212 250 grams250 grams
FeathersFeathers 1 dozen1 dozen 1212 5 grams5 grams
BricksBricks 1 dozen1 dozen 1212 10,000 g10,000 g
•What do all these substances have in common??
•Amount…… 1 dozen or 12 units
•Conversion factor?????????
•What is different about all these substances???
•The weight….
MolesMoles
Beaker of WaterBeaker of WaterMass of water is 36 gMass of water is 36 gHow many moles??How many moles??
2 moles2 moles
CST QuestionsCST Questions
How many moles of carbon -12 are How many moles of carbon -12 are contained exactly 6 grams of carbon -12contained exactly 6 grams of carbon -12
1.1. 0.5 moles0.5 moles
2.2. 2.0 moles2.0 moles
3.3. 3.0 moles3.0 moles
4.4. 16.0 moles16.0 moles
1. What is the Molecular mass?
12 g/mole
2. Convert grams into moles
6 g Cx
12 g CH4
1 mole CH4-----------------
CST QuestionsCST Questions
How many moles of CHHow many moles of CH44 are contained in are contained in
96.0 grams of CH96.0 grams of CH44??
1.1. 3.00 moles3.00 moles
2.2. 6.00 moles6.00 moles
3.3. 12.0 moles12.0 moles
4.4. 16.0 moles16.0 moles
1. What is the Molecular mass?
16 g/mole
2. Convert grams into moles
96.0 g CH4 x
16 g CH4
1 mole CH4-----------------
How many moles?How many moles?