3V les Periodic table and chemical formulas

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Hello 3TVS

Slide 1 - Diapositive

Planning for today
- What did we do last time?
- What are we learning this time?
-Theory Calculations and names of molecules
- Time for some homework
- A little bit more theory
- A form to fill in(more information near the end of class)
A break somewhere in between??

Slide 2 - Diapositive

Short recap
Who remembers what we learned last week?

Slide 3 - Diapositive

The world is built up from molecules and atoms
All types of atoms are found in the periodic table

Slide 4 - Diapositive

Molecules are made up from atoms!
But how do we write down what a molecule consists of?

Slide 5 - Diapositive

Index and coëfficient
Methane is made up of one Carbon atom and four Hydrogen atoms. Its formula will be:
CH4
The 4 in methane is called an Index

If you have 2 methane molecules, you write it down as:
CH4 (and not C2H8)
The 2 before methane is called the coefficient



Slide 6 - Diapositive

Index and Coëfficient
The Index denotes how many atoms of one kind are WITHIN a molecule
C2H6

The coëfficient denotes how many molecules are present in a situation
2 HNO3 (Two Nitric acid molecules)

Slide 7 - Diapositive

Some practice
What atoms are one water molecule made up from? What is its formula? Does it have an index or coëfficient?

 

What atoms are sugar molecules made up from? What would you write down if you had three sugar molecules?

Slide 8 - Diapositive

What atoms are water molecules made up from?
2 Hydrogen atoms, 1 oxygen atom
its formula is H2O
 

What atoms are sugar molecules made up from?
12 Carbon atoms, 22 Hydrogen atoms and 11 Oxygen atoms
If you have three of those molecules you write down:
3 C12H22O11

Slide 9 - Diapositive

Time to work
Chapter 2.3, page 58

Make 31, 33, 37, 38, 39, and 40

Slide 10 - Diapositive

Want me to discuss any of the questions/topics?

Slide 11 - Diapositive

Just a few more things!

Slide 12 - Diapositive

Molecules and atoms have mass
We weigh a certain amount, 

because

 the molecules and atoms we are made of weigh a certain amount!

Slide 13 - Diapositive

an Atom's mass is indicated in the Periodic table!

One Helium atom
weighs 4,003 u

u stands for Units 
of mass
1 u is equal to 0,000000000000000000000002 grams 

Slide 14 - Diapositive

Mass calculation
If water molecules consist of two hydrogen atoms and one oxygen atom they're mass is:


16,00 u + 2 x 1,008 u = 18,016 u


Slide 15 - Diapositive

Up next: 

Read "Naming of substances" on page 54


Slide 16 - Diapositive

Up next: 

Read "Naming of substances" on page 54

and make 
31, 33, 35, 36, 37, 38, 39, 40, 42, 43, 45
If there is time

Slide 17 - Diapositive

The homework is
31, 33, 35, 36, 37, 38, 39, 40, 42, 43, 45

Slide 18 - Diapositive

Invulblad!
- Ik vind het zelf niet zulke fijne vragen.
- Het is iets om mee te oefenen
- Ik doe er verder niks mee en het komt niet op het internet.
Regels:
- Doe het in stilte(En wees eerlijk)
- Als je niet wil dat anderen het zien, 
draai je blaadje om of kom hem meteen brengen
- Zodra je klaar bent, mag je hem komen brengen naar mij
- Je mag daarna gaan.

Slide 19 - Diapositive