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AQA GCSE Chemistry Paper 1 Questions And Answers Rated A+.

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AQA GCSE Chemistry Paper 1 Questions And Answers Rated A+. What is an *atom*? - correct answer. smallest part of an element What is an *element*? - correct answer. a substance that contains only one type of atom What are *chemical symbols*? - correct answer. - the letter o...

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  • September 23, 2024
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AQA GCSE Chemistry Paper 1 Questions
And Answers Rated A+.


What is an *atom*? - correct answer. smallest part of an element

What is an *element*? - correct answer. a substance that contains only one type of
atom

What are *chemical symbols*? - correct answer. - the letter or pair of letters that
represents an element.
- first letter is always capitalized

What are *compounds*? - correct answer. substances in which atoms of two or more
elements, which are chemically combined

What is a *chemical formula*? - correct answer. a combination of symbols that shows
the ratio of elements in a compound

Why are *chemical formula* used? - correct answer. - the different elements in a
compound
- how many atoms of each element one molecule of the compound contain

How can *compounds* be separated? - correct answer. Through chemical reactions

What are *reactants*? - correct answer. the starting materials in a chemical reaction
(on the left)

What are *products*? - correct answer. the ending materials in a chemical reaction
(on the right)

What is always *equal* to each other in a *chemical reaction*? - correct answer.
products to reactants
- no atoms are lost or made

What is a *mixture*? - correct answer. consist of two or more elements or compounds
which are not chemically combined

What are the *properties* of *mixtures*? - correct answer. they retain their own
properties from before
e.g. colour

,How can *mixtures* be separated? - correct answer. by physical processes - no new
substances are made

What is *filtration*? - correct answer. - used to separate soluble solids from insoluble
solids

What is *crystallisation*? - correct answer. - used to obtain a soluble solid from a
solution
1. Mixture is gently warmed
2. Water evaporates leaving crystals of pure salt

What is *simple distillation*? - correct answer. used to obtain a solvent from a solution

*RP* Analysis and purification of water samples from different sources - correct answer.
1. Use a pH probe or indicator to analyse the pH of the sample
2. Set up the equipment
3. Heat a set volume to 100oC so that the water changes from liquid to gas
4. Water collects in the condenser and changes state from gas to liquid
5. measure the mass of solid that remains to find the amount of dissolved solids present
in the sample

What is *fractional distillation*? - correct answer. - used to separate mixtures in which
the components have different boiling points

What is *chromatography*? - correct answer. used to separate the different soluble,
coloured components of a mixture

What were *atoms* thought to be in *early models*? - correct answer. Tiny spheres
that could not be divided into simpler particles

What did *Thomson* discover in 1898? - correct answer. electrons - causing the
representative of atoms to be changed

What model did *Thomson* make ? - correct answer. plum pudding model

What was the *plum pudding* model made up of? - correct answer. - atom contained
tiny, negative electrons
- surrounded by a positive charge

What did *Geiger and Marsden* do? - correct answer. measured the deflection of
alpha particles bombarding gold foil

What did *Geiger and Marsden* conclude about their experiment? - correct answer. -
some alpha particles deflected
- some went straight through

, What did *Rutherford* conclude about the *alpha and gold foil* experiment? - correct
answer. - there must be a positive charge in the center of each atom (new model now
called 'nuclear')

What did *Bohr* do? - correct answer. said that electrons were arranged in levels or
orbits around the nucleus

What did *James Chadwick* discover? - correct answer. neutrons in the nucleus

How big are *atoms*? - correct answer. - very small
- 0.1nm or 1 x 10^-10m

What do all *atoms* contain? - correct answer. protons, neutrons, electrons

What is the *relative charge* and *mass* of a *proton*? - correct answer. 1
+1

What is the *relative charge* and *mass* of a *nucleus*? - correct answer. 1
0

What is the *relative charge* and *mass* of an *electron*? - correct answer. very
small
-1

Where is most of the *mass* of an *atom*? - correct answer. nucleus

How much *smaller* is the radius of the *nucleus* compared to the rest of the atom? -
correct answer. 1/10000

Why do *atoms* have no *overall charge*? - correct answer. they contain an equal
number of protons and electrons

What do all atoms of a particular *element* have in common? - correct answer. - they
have the same number of protons

What is the *atomic number*? - correct answer. number of protons

What is the *mass number*? - correct answer. Number of protons and neutrons

What are *isotopes*? - correct answer. Atoms of the same element with different
numbers of neutrons

How can *atoms* become *ionic*? - correct answer. - by losing or gaining electrons

What do *metals* do to form *positive ions*? - correct answer. lose electrons

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