Recap chapter 7

What are we going to do today?
  • Recap chapter 7 through questions          
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Slide 1: Tekstslide
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In deze les zitten 25 slides, met interactieve quizzen en tekstslides.

Onderdelen in deze les

What are we going to do today?
  • Recap chapter 7 through questions          

Slide 1 - Tekstslide

Slide 2 - Tekstslide

Chapter 7 quick review

Slide 3 - Tekstslide

Conductivity of electricity

simple experiment =>




Different substances conduct electricity in different states.


Slide 4 - Tekstslide

When do metals conduct electricity?
A
solid and dissolved
B
solid and liquid
C
liquid and dissolved
D
never

Slide 5 - Quizvraag

Which particles are responsible for electrical conductivity in a liquid metal
A
positively charged metal atoms
B
negatively charged electrons
C
freely moving electrons
D
freely moving electrons en + charged metal atoms

Slide 6 - Quizvraag

Metals


* Formula consists only of symbols of metals

* Conduct electricity in solid and liquid state due to negatively charged electrons which move can move freely in the metallic lattice. In liquid state the positively charged metal atoms conduct as well.
* Metal bond is very strong => high melting points


Slide 7 - Tekstslide

Francium is a
A
precious metal
B
semi-precious metal
C
reactive metal
D
highly-reactive metal

Slide 8 - Quizvraag

Metals



* electrons are also responsible for the flexibility of metals.

* precious, semi-precious, reactive and highly reactive metals. (corrosion)

* Alloys: change characteristics, e.g. less flexibel:


Slide 9 - Tekstslide

When do salts conduct electricity?
A
solid and dissolved
B
solid and liquid
C
liquid and dissolved
D
never

Slide 10 - Quizvraag

Salts

* formula consists of symbols of metals and
non-metals.

* Cannot conduct electricity in solid state, because the charged particles (ions) cannot move freely in the ionic lattice.

* Ions are formed because electrons leave the outer orbit (positive) or enter the outer orbit (negative).


Slide 11 - Tekstslide

Salts

* Ionic bonds are strong, but the ionic lattice is
not flexible (applying force will disrupt the ionic bond and the salt will fall apart.

* Salts in water:
NaCl(s)=>Na+ (aq)+Cl-(aq)


Slide 12 - Tekstslide

When do molecular substances conduct electricity?
A
solid and dissolved
B
solid and liquid
C
liquid and dissolved
D
never

Slide 13 - Quizvraag

Barium chloride (BaCl2) is dissolved in water. Choose the correct chemical equation.
A
BaCl(s) =>Ba+(aq)+Cl-(aq)
B
Ba+(aq)+Cl-(aq) =>BaCl(s)
C
BaCl2(s) =>Ba2+(aq)+2Cl-(aq)
D
Ba2+(aq)+2Cl-(aq) =>BaCl2(s)

Slide 14 - Quizvraag

The melting point of sodium chloride is 801 °C, explain why this is so high.

Slide 15 - Open vraag

Molecular substances

* formula consists of symbols of non-metals.

* Attractive forces between molecules => van der Waals forces => result in van der Waals bonding.
=> the greater the molecule mass and surface the stronger the van der Waals bonding.

Slide 16 - Tekstslide

Molecular substances

* Covalent bond or atomic bond

* Covalency or covalence

* Hydrophylic and hydrophobic (NH- and/or OH-groups!)

* emulsifier



Slide 17 - Tekstslide

Does the following substance readily dissolve in water?
A
Yes
B
No

Slide 18 - Quizvraag

Does the following substance readily dissolve in water?
A
Yes
B
No

Slide 19 - Quizvraag

What is the covalency of Se
A
1
B
2
C
3
D
no covalency

Slide 20 - Quizvraag

What is the covalency of Sr
A
1
B
2
C
3
D
no covalency

Slide 21 - Quizvraag

What kind of substance is C2H6
A
Metal
B
Salt
C
Molecular substance

Slide 22 - Quizvraag

What kind of substance is CaCO3
A
Metal
B
Salt
C
Molecular substance

Slide 23 - Quizvraag

What kind of substance is Kr
A
Metal
B
Salt
C
Molecular substance

Slide 24 - Quizvraag

What kind of substance is Hf
A
Metal
B
Salt
C
Molecular substance

Slide 25 - Quizvraag