C8-Chemical analysis Flashcards
What is the test for chlorine
Chlorine bleach is damp litmus paper, turning it white
What is the test for oxygen
If you put a glowing splint inside a test tube containing oxygen, the auction will re-lights the glowing splint
What is the test for carbon dioxide
Mixing carbon dioxide with calcium hydroxide (lime water) Causes the solution to turn cloudy
What is the test for hydrogen
If you hold a little splint at the open end of the test tube containing hydrogen, you’ll get a squeaky pop
What is a formulation
Are useful mixture with a precise Purpose
What is a pure substance
Something that only contains one compound or element throughout
How can you tell how pure A substance is
A chemically Pure substance will melt or boil at specific temperatures
What are examples of formulations
Paint Medicine Fuel Cosmetics Fertiliser
How do you measure the RF value
RF = distance moved by substance/distance moved by solvent
What is chromatography
Separating mixtures and giving information to help identify substances
What are two stages of Chromatography
A mobile phase – a stationary phase
What are the steps for chromatography
First draw a horizontal line across the chromatography paper with a pencil and ruler 10 cm away from the bottom – then using the Capillary tube.5 different colours including one mixture across the pencil drawn line
– then fill the measuring cylinder with a solvent so that that it touches the paper but not the line with the samples on
– finely placed to come to every paper in the water and wait for the colour samples to rise and take results
What can affect the different rates that components travel on the Chromotography paper
How attracted to the component as to the paper
How soluble they are in a solvent
