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Chemistry f321 quiz

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AS - Level Chemistry Quiz on Chemistry f321 quiz, created by rosieoj2 on 26/02/2015.
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Quiz by rosieoj2, updated more than 1 year ago
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Created by rosieoj2 almost 10 years ago
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Question 1

Question
What did John Dalton NOT predict about the atom?
Answer
  • Atoms are tiny particles that make up elements
  • Atoms cannot be divided
  • Atoms have negative electrons which move around in a 'sea' of electrons
  • All atoms of a given element are the same

Question 2

Question
What is J J Thomson most famous for?
Answer
  • Working out the number of atoms in a mole
  • Discovering that cathode rays are made up of a stream of particles called electrons
  • Finding a law allowing people to indirectly determine the enthalpy change of a reaction
  • Shooting JFK

Question 3

Question
Who carried out the gold leaf experiment, in which alpha particles were fired at a thin sheet of gold foil?
Answer
  • Dalton
  • Hess
  • Rutherford
  • Bohr

Question 4

Question
Which of these are Rutherford's main conclusions from his experiment into the structure of the atom?
Answer
  • The positive charge and most of the mass of the atom are concentrated at the centre, in the nucleus Negative electrons orbit the nucleus Electrons follow only certain paths Most of the atom is made up of empty space
  • The atom is made up of negative electrons in a 'sea' of positive charge
  • Atoms cannot be divided Atoms are tiny particles that make up elements
  • The overall charge of an atom is 0 electrons orbit the nucleus Most of the atom is empty space The positive charge and most of the mass of an atom is centred in the middle, in the nucleus

Question 5

Question
what is the relative mass of an electron?
Answer
  • 1
  • 2000
  • 1/2000
  • 1/20 000

Question 6

Question
what is the definition of an isotope?
Answer
  • atoms of the same element with different numbers of neutrons
  • atoms of the same elements with different numbers of protons
  • atoms with different mass numbers
  • atoms with the same charges

Question 7

Question
How many atoms are in one mole?
Answer
  • 6.02 x 10 to the power of 24
  • 2.06 x 10 to the power of 13
  • 6.02 x 10 to the power of 23
  • 6.03 x 10 to the power of 24

Question 8

Question
what is the definition of relative isotopic mass?
Answer
  • the weighted mean mass of an atom compared to one-twelfth the mass of an atom of carbon-12
  • the weighted mean mass of an atom compared to twelve grams of carbon-12
  • the mass of an isotope of an element compared to twelve grams of carbon -12
  • the mass of an isotope of an element compare to one -twelfth the mass of one atom of carbon-12

Question 9

Question
what is the definition of relative atomic mass?
Answer
  • the weighted mean mass of an atom of an element compared to one-twelfth the mass of an atom of carbon-12
  • the weighted mean mass of an atom compared to 12 grams of carbon-12
  • the mass of an atom compared to one -twelfth the mass of an atom of carbon-12
  • the mass of an isotope of an element compared to one -twelfth the mass of one atom of carbon 12

Question 10

Question
what is the definition of a mole?
Answer
  • the amount of any substance containing as many particles as there are carbon atoms in exactly 12 grams of the crabon-12 isotope
  • the mass of 6.02 x 10 to the power of 23 atoms
  • a small mammal adapted to a subterranean lifestyle
  • the number of atoms per mole in a compound

Question 11

Question
how do you find the number of moles in a substance?
Answer
  • mr divided by the mass
  • mass divided by the mr
  • mass times the mr
  • mr squared minus the mass

Question 12

Question
what do you need to do to find the empirical formula?
Answer
  • list the elements, the mr, then divide by the smallest
  • list the elements, the experimental masses, number of moles, divide mass by moles, divide by smallest
  • list the elements, the experimental masses, mr, divide mass by mr, divide by smallest
  • list all the elements, experimental masses, mr, divide by smallest

Question 13

Question
what does Avogadro's hypothesis state?
Answer
  • there are 6.02 times 10 to the power of 23 molecules in a mole
  • the mr is calculated by adding the ar of all the elements present in the compound
  • the volume of gas stays the same regardless of RTP
  • equal volumes of gases at the same temperature and pressure contain equal numbers of molecules

Question 14

Question
what is the formula for calculating the number of moles present in a gas at RTP?
Answer
  • volume (dm cubed) divided by 24.0
  • volume (cm cubed) divided by 24.0
  • Volume (dm cubed) divided by 23.0
  • volume times mr divided by 24.0

Question 15

Question
what is the formula for calculating the number of moles in a liquid?
Answer
  • volume (cm cubed) times concentration
  • volume (dm cubed) divided by concentration
  • volume (dm cubed) times concentration
  • volume (dm cubed) times mr

Question 16

Question
What is the definition of an acid?
Answer
  • A substance with a pH of less than 7
  • A substance the neutralises an alkali
  • A proton donator
  • A dehydrated salt

Question 17

Question
What is the definition of an alkali?
Answer
  • A soluble base
  • A base that dissolves in water to release OH minus ions
  • A substance that is above pH 7
  • The opposite to an acid

Question 18

Question
What is the definition of a base?
Answer
  • A proton acceptor
  • A soluble alkali
  • A substance that is pH7
  • A substance that is above pH 7

Question 19

Question
What is the formula of nitric acid?
Answer
  • NH2
  • HN03
  • H2NO3
  • NaCl

Question 20

Question
What is the definition of a salt?
Answer
  • Formed when an acid and an alkali neutralise each other
  • Formed when the H+ ion in an acid is replaced by a metal ion or other positive ion
  • A popular seasoning
  • A mildly acidic substance (pH5-6) that is formed in the presence of an acid catalyst

Question 21

Question
Acid + carbonate --> ??
Answer
  • Salt + hydrogen + water
  • Salt + hydrogen + carbon dioxide
  • Salt + hydrogen
  • Salt + carbon dioxide + water

Question 22

Question
Acid + base --> ??
Answer
  • Salt + hydrogen
  • Salt + water
  • Salt + oxygen + water
  • Salt + carbon dioxide + water

Question 23

Question
Acid + alkali --> ??
Answer
  • Salt + water
  • Salt + hydrogen + metal oxide
  • Metal oxide + hydrogen
  • Salt + oxygen + water

Question 24

Question
What is the definition of... a) hydrated and b) anhydrous
Answer
  • a) a crystalline compound containing water molecules, b) and crystalline compound containing no water molecules
  • a) an aqueous solution, b) a liquid solution
  • a) a crystalline compound containing water molecules, b) a substance that contains no water molecules
  • a) a crystalline structure, b) a simple covalent structure

Question 25

Question
What does water of crystallisation refer to?
Answer
  • the water molecules that form an essential part of the crystalline structure of a substance
  • the water needed in order to hydrate a substance
  • water molecules that are able to form a crystalline structure under extreme conditions
  • the crystalline structure of non-metals

Question 26

Question
What is the oxidation number of an uncombined event?
Answer
  • 1
  • 0
  • -1
  • +2

Question 27

Question
What is the oxidation number of combined fluorine?
Answer
  • +1
  • 0
  • -1
  • +3

Question 28

Question
What is the oxidation number of combined oxygen?
Answer
  • -2
  • +2
  • +3
  • -1

Question 29

Question
What is the oxidation number of combined hydrogen?
Answer
  • -1
  • 0
  • -2
  • +1

Question 30

Question
What is it called when electrons are lost from an element in a reaction?
Answer
  • Reduction
  • Reductation
  • Oxidation
  • Minimisim

Question 31

Question
What is it called when electrons are gained by an atom in a reaction?
Answer
  • Oxidation
  • Reduction
  • Inheritance
  • Maximism

Question 32

Question
What is a reducing agent?
Answer
  • a reagent that oxidises another species
  • a reagent that is reduced in a reaction
  • a reagent that reduces another species
  • an atom that has been reduced

Question 33

Question
What is a redox reaction?
Answer
  • A reaction where the same element is both reduced and oxidised
  • A reaction which is both endo- and exothermic
  • A reaction that has a total enthalpy change of 0
  • A reaction in which both reduction and oxidation take place

Question 34

Question
What is an oxidising agent?
Answer
  • a reagent that oxidises another species
  • a species that has been oxidised
  • a reagent that accelerates the rate of reduction
  • a reagent that release energy when exposed to oxygen
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