Quantities and units
Elements and compounds
Separation techniques
Solutions
KTM
100
Property that does not depend on the amount of matter.
What is intensive property?
100
What are pure substances?
Elements and compounds.
100
Decantation, filtration.
Name techniques used for heterogeneous mixtures
100
Define solute
In a homogeneous mixture, the component in smaller amount.
100
Particles vibrate in fixed positions.
Describe particles in solids.
200
Unit for density in international system.
kg/m3
200
Define element.
A pure substance wiyh only one type of atom.
200
Technique used to separarte homogeneous liquids
Distillation
200
What is a solution of 20g/l.
A solution that contains 20 g of solute in one litre of solution.
200
Increase of volume in a gas due to a decrease in pressure upon it.
Expansion.
300
Formula for cylinder volume
pi*r2*h
300
What is a molecule?
A group of atoms bonded together in a fixed proportion.
300
Material needed in decantation technique
Separatory funnel, beaker.
300
Material needed to prepare 100 ml of a 80 g/l solution.
100 ml volumetric flask, pippette, scale, beaker.
300
Describe melting from the KTM point of view.
As temperature increases, particles vibrate faster, IMF become weaker and finally particles can move pass each other.
400
When was the metric system created? Who did it?
By the end of eighteenth century. A group of french scientists.
400
Draw a mixture of a biatomic compound and a triatomic element.
On blackboard.
400
How do you separate a mixture of sand and water?
Filtration
400
What is a 34% by mass solution?
The solution that contains 34 grams of solute per 100 g of solution.
400
Melting, vaporisation and sublimation.
Changes of state that need a heat absorption from the surroundings.
500
Explain the displacement technique.
You introduce a solid in a liquid and calculate its volume looking at the volume of liquid displaced.
500
Draw on the blackboard: 3 molecules of NH3, 2 atoms of He and 3 molecules of PBr3
On blackboard.
500
What is a condenser?
In distillation, the material used to turn the evaporated liquid into liquid again.
500
Calculate the mass of solute and solvent in 200 g of a solution 25% by mass.
50 grams of solute and 150 grams of solvent
500
If you introduce a ballon full of CO2 in liquid nitrogen....
CO2 becomes solid.
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