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GCSE CHEMISTRY REVISION (PAPER 1 & 2) QUESTIONS AND ANSWERS ELABORATIONS!!
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GCSE CHEMISTRY REVISION (PAPER 1 & 2) QUESTIONS AND ANSWERS ELABORATIONS!!
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GCSE CHEMISTRY REVISION (PAPER 1 & 2) QUESTIONS ANDANSWERS ELABORATIONS!!
What is the alpha scattering experiment?
Answers :1. Fired alpha particles at gold foil
2. It was expected that alpha particles would travel through the foil
3. Some were deflected. (Alpha scattering)
4. This suggested that the positive charge and mass of an atom was concentrated in
the centre, or the atom.
What is an element?
Answers :a Substance that contains only ONE type of atom. Will have same
proton number
What is a mixture?
Answers :A combination of two or more substances that are not chemically
combined
What is a compound?
Answers :2 or more elements chemically combined. Will have different proton
number
What is an isotope?
Answers :Atoms of the same element that the same number of protons and a
different numbers of neutrons
What is the relative atomic mass?
Answers :The average mass of all the atoms of an element
,What is the process of filtration?
Answers :Passing water through a material such as a bed of sand
What is the process of crystallisation?
Answers :When solutes can be separated from a solvent by evaporating the solvent
so that only the solutes are left behind. The process leaves behind various sized,
solid crystals
What is the process of simple distillation?
Answers :water boils and is condensed back to a liquid by a condenser
What is the process of fractional distillation?
Answers :components in a chemical mixture are separated into different parts
according to their different boiling points. used to purify chemicals or to separate
mixtures to obtain their components
What is the process of paper chromatography?
Answers :separating dissolved chemical substances by their different migration
rates across the sheets of paper
How do you draw atoms?
Answers :Electrons in an atom are placed in fixed shells. The first shell can have
up to 2, and up to 8 in the second and third shell
Relative charge of a proton
Answers :+1
, Relative charge of a neutron
Answers :0
Relative charge of an electron
Answers :-1
Relative mass of a proton
Answers :1
Relative mass of a neutron
Answers :1
Relative mass of an electron
Answers :0
Atomic models:
Answers :
What are group 1 elements called?
Answers :alkali metals
Why are group 1 elements called alkali metals?
Answers :They react with water to form alkaline solutions
Are group 1 elements reactive or unreactive?
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