Karteikarten
AQA C1 - Atomic Structure
Karten in diesem Stapel (14)
- 1What is a compound?Combining different atoms, a compound is made up of at least 2 different elements.
- 2What is the chemical formula for sodium oxide?Na₂O
- 3How much of Earth's atmosphere does oxygen make up?About 21%
- 4Key features of a chemical reaction- Compounds broken up or formed
- At least 1 new substance is created
- Measurable energy change
- No atoms created/destroyed - 5What is the relative charge of a neutron? What is its relative mass?Relative charge = neutral (0)
Relative mass = 1 - 6What is an isotope?Different form of the same element, same number of proton but different number of neutrons.
- 7Why is the relative atomic mass of chlorine not a whole number?Chlorine has more than one isotope. Relative atomic mass is an average that takes into account the different masses and abundances of all the isotopes that make up an element.
- 8Size of the radius of an atom compared to the radius of the nucleusThe radius of an atom is around 10,000 times the size of the radius of the nucleus.
- 9Why should you put a lid on the container during a paper chromatography experiment?A lid helps to stop the solvent from evaporating.
- 10True or false? When substances are combined in a mixture, their chemical properties change.False, the chemical properties of the substances in a mixture are unchanged.
- 11What is a solvent front?The point that the solvent in paper chromatography reaches as it moves up the paper.
- 12Why are techniques to separate mixtures described as physical processes?It does not involve any chemical reactions, and no new substances are made.
- 13When can filtration be used to separate a mixture?When you have a mixture of an insoluble solid and a liquid.
- 14When can crystallisation be used to separate a mixture?To separate a soluble solid from a solution.
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- GCSE Chemistry Karteikarten am AQA C1 - Atomic Structure, erstellt von Jack Piper am 04/06/2021.
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- Jack Piper
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