Elements, Compounds And Mixtures Flashcards
What is an element
A substance that cannot be broken down into simpler
What is a compound
A compound is a substance with two or more elements chemically joined together, and cannot be easily separated
What is a mixture
A mixture is a substance made from 2 or more elements physically combined and can easily be separated
What was the gas test for hydrogen?
Burns with a squeaky pop
What is the test for carbon dioxide
Turns limewater from clear to cloudy
What is the test for oxygen
Relights a glowing splint
Explain the differences between mixtures and compounds in terms of the physical and chemical properties
Compounds are formed by a chemical reaction between two or more elements and cannot be separated easily.
A mixture is a substance formed by mixing 2 or more substances physically and can be separated easily.
How can a mixture be separated?
Mixtures can be quite easily separated, depending on the properties of the substances contained in the mixture
Describe some methods of separation to obtain pure substances from the mixture
evaporation, distillation, filtration and chromatography.
Explain how mixtures can be separated using filtration
Take a circle of filter paper folded to make a cone and placed into a filter funnel.
The filtrate is the liquid which passes through the filter paper and the residue is the solid left on the filter paper.
How Can you separate mixtures using a magenet
passing the magnet over the mixture when it will pick the magnetic substance out of the mixture
What does a magnet separate?
metal from Refuse
What Does filtration separate?
Solid from liquids
What does crystallisation separate?
a soluble solid from a solution
What does chromotagrphy separate?
Mixtures of soluble substances
