4142612
Descrição
Quiz por Lilac Potato, atualizado more than 1 year ago
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Criado por Lilac Potato
quase 9 anos atrás
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Questão 1
Questão
The mass number tells you the total number of protons and neutrons. Electron aren't counted in this number because their relative atomic mass is [blank_start]negligible[blank_end].
Responda
-
negligible
-
extremely large
-
negative
Questão 2
Questão
Which of these 2 statements describes a compound?
Responda
-
Compounds are two or more elements chemically bonded together
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Compounds are two or more elements which are not chemically bonded together
Questão 3
Questão
Isotopes are different atomic forms of the same element which have the same number of neutrons but a different number of protons.
Responda
- True
- False
Questão 4
Questão
In ionic bonding, atoms lose or gain electrons to form charge particles (ions). Atoms from groups 1 and 2 are more likely to [blank_start]lose[blank_end] electrons.
Responda
-
lose
-
gain
Questão 5
Questão
Which of the following statements are true about ionic compounds?
Responda
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They have giant ionic lattices
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There are very strong electrostatic forces of attraction between oppositely charged ions
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They have high melting and boiling points
-
They dissolve easily in water
-
They have small ionic lattices
-
There are very weak electrostatic forces of attraction between oppositely charged ions
-
They have low melting and boiling points
-
They don't dissolve easily in water
Questão 6
Questão
Covalent bonding involves sharing electrons to obtain full outer shells. These are strong bonds.
Responda
- True
- False
Questão 7
Questão
Which of these are features of simple molecular substances?
Responda
-
They have weak intermolecular forces
-
They have low melting and boiling points
-
They don't conduct electricity
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They have strong intermolecular forces
-
Thy have high melting and boiling points
-
They conduct electricity
Questão 8
Questão
Graphite is the only non-metal which is a good conductor of heat and electricity. This is because each carbon atom has one [blank_start]delocalised electron[blank_end].
Responda
-
delocalised electron
Questão 9
Questão
Metals can be bent or shaped as the delocalised electrons allow the layers of atoms to slide over each other.
Responda
- True
- False
Questão 10
Questão
What size are nanoparticles?
Responda
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1-100 nm across
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100-1000 nm across
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0-1 nm across
Questão 11
Questão
Many new uses of nanoparticles are being developed: which of these can they be used for?
Responda
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Catalysts
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Sun cream and deodorants
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Nanomedicine
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Lubricant coatings
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Electrical circuits
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Hand warmers
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Plastic bags
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Making alloys
Questão 12
Questão
Thermosetting polymers have [blank_start]crosslinks[blank_end] which hold the chains together in a solid structure.
Responda
-
crosslinks
Questão 13
Questão
How do you work out number of moles?
Responda
-
mass/relative formula mass
-
relative formula mass/mass
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relative formula mass * mass
Questão 14
Questão
Yields are always less than 100%, this may be because:
Responda
-
the reaction is reversible
-
when you filter a liquid to remove solid particles, you usually lose some of the liquid/solid
-
unexpected reactions happen
-
there are no reactants
-
you don't do the experiment in industrial conditions
Questão 15
Questão
Name two ways of identifying substances.
Responda
-
Paper Chromatography
-
Gas Chromatography
-
Solid Chromatography
-
Colour Chromatography
Questão 16
Questão
The rate of a reaction depends on four things: temperature, [blank_start]concentration[blank_end], catalyst and surface area.
Responda
-
concentration
Questão 17
Questão
Which of these methods of measuring the rate of a reaction is the most accurate?
Responda
-
Precipitation: observing a mark through the solution and measuring how long it takes for the mark to disappear
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Change in mass: carry experiment out on a mass balance and observe how mass disappears (as gas is released)
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Volume of gas given off: Use a gas syringe to measure volume of gas given off
Questão 18
Questão
The reaction between HCl acid and marble chips can be sped up by using finer particles of solid as it has a [blank_start]larger[blank_end] surface area.
Responda
-
larger
-
smaller
Questão 19
Questão
Higher temperature increases the number and energy of collisions which means it takes more time for the particles to have enough energy to start the reaction.
Responda
- True
- False
Questão 20
Questão
A [blank_start]catalyst[blank_end] is a substance which speeds up a reaction without being changed or used up in the reaction.
Responda
-
catalyst
Questão 21
Questão
Which of these are disadvantages of catalysts?
Responda
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Very expensive to buy
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Different reactions require different catalysts
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Catalysts can be poisoned by impurities
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They are harmful to people
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They are very rare
Questão 22
Questão
Which of these are examples of exothermic reactions?
Responda
-
Combustion
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Neutralisation reactions
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Respiration
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Sports injury packs
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Photosynthesis
Questão 23
Questão
An alkali is a [blank_start]base[blank_end] that dissolves in water.
Responda
-
base
Questão 24
Questão
Acid + Metal ------> Salt + Oxygen
Responda
- True
- False
Questão 25
Questão
Ammonia + Nitric acid -------> [blank_start]Ammonium nitrate[blank_end]
Responda
-
Ammonium nitrate
Questão 26
Questão
Which of these are methods of making soluble salts?
Responda
-
Using a metal/insoluble base
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Using an alkali
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Precipitation reactions
Questão 27
Questão
An electrolyte contains free [blank_start]ions[blank_end] which conduct electricity.
Responda
-
ions
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electrons
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atoms
Questão 28
Questão
Oxidation is loss of electrons and reduction is gaining electrons.
Responda
- True
- False
Questão 29
Questão
In electrolysis, at the [blank_start]negative[blank_end] electrode, if metal and H+ ions are present, the metal ions will stay in solution is the metal is [blank_start]more[blank_end] reactive than hydrogen.
Responda
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more
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less
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negative
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postive
Questão 30
Questão
Uses of chlorine:
Responda
-
Bleach
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Plastics
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Plating metals
Questão 31
Questão
Cryolite is used to [blank_start]lower[blank_end] the temperature needed to melt aluminium oxide.
Responda
-
lower
Questão 32
Questão
In electroplating, you put the thing you want to plate at the positive electrode.
Responda
- True
- False
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