Experimental Chemistry - 1
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1
What is the SI unit for time, temperature and length
seconds, kelvin, metre
2
What is the SI unit for mass and volume
kilogram, cubic metre
3
How do you convert from Celsius to kelvin
Temperature in C + 273
4
How many cubic decimetres is 1 cubic metre
1000
5
How many decimetres is a metre
10
6
What is a pipette?
A glass tube used to accurately measure fixed volumes of liquid eg 10.0cm^3
7
What is a volumetric flask?
A glass tube used to accurately measure fixed volumes of liquid in larger amounts
8
Measuring Cylinder vs Burette
Measuring cylinder measures range of volumes to nearest 0.1cm^3 while burette measures to 0.01cm^3
9
What apparatus is used for measuring volume of gas
Gas Syringe
10
What are the 2 factors that affect the method used for collecting gas?
Solubility and Density
11
Downward Delivery vs Upward Delivery
Downward Delivery is for gases denser then air in atomic mass while upward delivery is for gases less dense than in atomic mass
12
What is 1 thing common between downward and upward delivery
They both are used on gases which are insoluble or soluble in water
13
What kind of gas is water displacement used for
Gases which are insoluble or slightly soluble in water and density does not matter
14
What are some magnetic materials able to be separated by magnetic attraction?
Iron, Cobalt, Nickel and some alloys (steel)
15
What substances can sieving separate?
Separating solids with different particle sizes
16
What is the name for a liquid that dissolves solids
Solvents
17
What is the name for a solid that dissolves in a solvent?
Solutes
18
What type of substance can be separated with filtration
Separating insoluble solids from liquids
19
What is the name for a liquid that passes through a filter paper
Filtrate
20
What is the name for a substance left on a filter paper
Residue
21
What type of substance should evaporation to dryness be used on
A solute that does not decompose when heated
22
What is evaporation to dryness for
To separate a dissolved solid from its solvent by heating the mixture until all the solvent has vapourised
23
What type of substance should crystallisation be used on
A solute that decomposes when heated
24
What is crystallisation for?
To obtain a pure solid from its saturated solution
25
What is simple distillation for?
To separate a pure solvent from a solution
26
What is chromatography?
Chromatography is used to separate a mixture of substances which have different solubilities in a given solvent
27
What are some applications of chromatography?
Identify unauthorised substances in food like pesticides and poisons as well as banned substances in athletes' urine / blood, separate components like DNA fragments
28
What is fractional distillation?
Used to separate miscible mixtures with different boiling points
29
What are the properties of a pure substance?
It has a specific melting and/or boiling point under fixed conditions
30
What are the properties of a mixture
A mixture with 2 or more substances will melt / boil over a range of temperatures
31
What is this apparatus?
Pipette
32
What is this?
Measuring cylinder
33
What is this
Volumetric flask
34
What is that
Burette