4142612
Descripción
Test por Lilac Potato, actualizado hace más de 1 año
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Creado por Lilac Potato
hace casi 9 años
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Pregunta 1
Pregunta
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].
Respuesta
-
negligible
-
extremely large
-
negative
Pregunta 2
Pregunta
Which of these 2 statements describes a compound?
Respuesta
-
Compounds are two or more elements chemically bonded together
-
Compounds are two or more elements which are not chemically bonded together
Pregunta 3
Pregunta
Isotopes are different atomic forms of the same element which have the same number of neutrons but a different number of protons.
Respuesta
- True
- False
Pregunta 4
Pregunta
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.
Respuesta
-
lose
-
gain
Pregunta 5
Pregunta
Which of the following statements are true about ionic compounds?
Respuesta
-
They have giant ionic lattices
-
There are very strong electrostatic forces of attraction between oppositely charged ions
-
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
Pregunta 6
Pregunta
Covalent bonding involves sharing electrons to obtain full outer shells. These are strong bonds.
Respuesta
- True
- False
Pregunta 7
Pregunta
Which of these are features of simple molecular substances?
Respuesta
-
They have weak intermolecular forces
-
They have low melting and boiling points
-
They don't conduct electricity
-
They have strong intermolecular forces
-
Thy have high melting and boiling points
-
They conduct electricity
Pregunta 8
Pregunta
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].
Respuesta
-
delocalised electron
Pregunta 9
Pregunta
Metals can be bent or shaped as the delocalised electrons allow the layers of atoms to slide over each other.
Respuesta
- True
- False
Pregunta 10
Pregunta
What size are nanoparticles?
Respuesta
-
1-100 nm across
-
100-1000 nm across
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0-1 nm across
Pregunta 11
Pregunta
Many new uses of nanoparticles are being developed: which of these can they be used for?
Respuesta
-
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
Pregunta 12
Pregunta
Thermosetting polymers have [blank_start]crosslinks[blank_end] which hold the chains together in a solid structure.
Respuesta
-
crosslinks
Pregunta 13
Pregunta
How do you work out number of moles?
Respuesta
-
mass/relative formula mass
-
relative formula mass/mass
-
relative formula mass * mass
Pregunta 14
Pregunta
Yields are always less than 100%, this may be because:
Respuesta
-
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
Pregunta 15
Pregunta
Name two ways of identifying substances.
Respuesta
-
Paper Chromatography
-
Gas Chromatography
-
Solid Chromatography
-
Colour Chromatography
Pregunta 16
Pregunta
The rate of a reaction depends on four things: temperature, [blank_start]concentration[blank_end], catalyst and surface area.
Respuesta
-
concentration
Pregunta 17
Pregunta
Which of these methods of measuring the rate of a reaction is the most accurate?
Respuesta
-
Precipitation: observing a mark through the solution and measuring how long it takes for the mark to disappear
-
Change in mass: carry experiment out on a mass balance and observe how mass disappears (as gas is released)
-
Volume of gas given off: Use a gas syringe to measure volume of gas given off
Pregunta 18
Pregunta
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.
Respuesta
-
larger
-
smaller
Pregunta 19
Pregunta
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.
Respuesta
- True
- False
Pregunta 20
Pregunta
A [blank_start]catalyst[blank_end] is a substance which speeds up a reaction without being changed or used up in the reaction.
Respuesta
-
catalyst
Pregunta 21
Pregunta
Which of these are disadvantages of catalysts?
Respuesta
-
Very expensive to buy
-
Different reactions require different catalysts
-
Catalysts can be poisoned by impurities
-
They are harmful to people
-
They are very rare
Pregunta 22
Pregunta
Which of these are examples of exothermic reactions?
Respuesta
-
Combustion
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Neutralisation reactions
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Respiration
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Sports injury packs
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Photosynthesis
Pregunta 23
Pregunta
An alkali is a [blank_start]base[blank_end] that dissolves in water.
Respuesta
-
base
Pregunta 24
Pregunta
Acid + Metal ------> Salt + Oxygen
Respuesta
- True
- False
Pregunta 25
Pregunta
Ammonia + Nitric acid -------> [blank_start]Ammonium nitrate[blank_end]
Respuesta
-
Ammonium nitrate
Pregunta 26
Pregunta
Which of these are methods of making soluble salts?
Respuesta
-
Using a metal/insoluble base
-
Using an alkali
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Precipitation reactions
Pregunta 27
Pregunta
An electrolyte contains free [blank_start]ions[blank_end] which conduct electricity.
Respuesta
-
ions
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electrons
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atoms
Pregunta 28
Pregunta
Oxidation is loss of electrons and reduction is gaining electrons.
Respuesta
- True
- False
Pregunta 29
Pregunta
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.
Respuesta
-
more
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less
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negative
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postive
Pregunta 30
Pregunta
Uses of chlorine:
Respuesta
-
Bleach
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Plastics
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Plating metals
Pregunta 31
Pregunta
Cryolite is used to [blank_start]lower[blank_end] the temperature needed to melt aluminium oxide.
Respuesta
-
lower
Pregunta 32
Pregunta
In electroplating, you put the thing you want to plate at the positive electrode.
Respuesta
- True
- False
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