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AQA A-level Chemistry - Physical Chemistry - 1.1 Atomic Structure Questions and Answers Which letter is used to represent the atomic number of an atom? Z What does the atomic number tell us about an element? Atomic number = number of protons in an atom What letter represents mass number? A How is the mass number calculated? mass number = number of protons + number of neutrons (total number of nucleons) Define relative atomic mass Average mass of all isotopes of...

OCR B Salters A level chemistry Questions and answers percentage error Uncertainty / reading x 100 JJ Thomson Plum pudding model (1897) Ernest rutherford Gold foil experiment- discovered nucleus (1909) Niels Bohr 1913- discovered that electrons move around the nucleus in orbits called electron shells. EM emitted/ absorbed when moving between levels- fixed frequency Mass Spectrometer steps 1. Vaporisation 2.Ionisation 3.Acceleration 4.Ion drift 5.Detection ...

AQA A Level Chemistry Transition Metals – Colours Questions and Answers Colour of MnO4- (+7 oxidation state) purple Colour of CrO7 2- (+6 oxidation state) orange Colour of V(O2)+ (+5 oxidation state) yellow Colour of VO 2+ (+4 oxidation state) blue Colour of V 3+ (+3 oxidation state) green Colour of Cr 3+ (+3 oxidation state) green/violet Colour of Fe 3+ (+3 oxidation state) yellow Colour of V 2+ (+2 oxidation state) violet Colou...

AQA A level Chemistry Bonding (chemrevise) Questions and Answers What is Ionic bonding? electrostatic force of attraction between oppositely charged ions formed by electron transfer When do metal atoms form an ion with a ve+ charge? when they lose electrons When do non-metal atoms form an ion with a ve- charge? when they gain electrons When is ionic bonding stronger and melting points higher? -ions are smaller -ions have higher charges What is a covalent bond? ...

A-Level Chemistry Atomic structures and isotopes Questions and Answers State what is meant by the term isotopes? Atoms of the same element with different numbers of neutrons. Isotopes of specific element (carbon) have the same chemical properties. Explain why. Same number of electrons in the outer shell. What is the difference between the atomic structures of any given isotopes? You just talk about the number of neutrons present on the isotope. 2) For example, one isotope has...

A Level Chemistry Periodicity Questions and Answers How is the periodic table arranged? By atomic number Define period A horizontal row of elements Define group A vertical column. Elements in a group have similar chemical properties as they have the same number of outer shell electrons Define periodicity A repeating pattern of properties shown across different periods What is the s-block? Groups 1 and 2 What is the p-block? Groups 3-8 What is the ...

A level Chemistry Topic 1 Questions and Answers Define an element Substance made of one type of atom with the same number of protons Define an isotope Atoms which have the same number of protons but different number of neutrons Define an ion Atom which has different number of protons and electrons, with a positive or negative charge Define an orbital Region within an atom that can an electron can be found, holding up to 2 electrons Define the term "Relative At...

AQA A Level Chemistry Year One - Required Practical’s Pt 1 Questions and Answers 1a) Describe how you should weigh out a required mass given a sample bottle 1a) Weigh the sample bottle to 2dp Transfer mass to beaker Reweigh sample bottle Record difference in mass 1a) Describe how you should make up a volumetric solution from a weighed out mass 1a) Add 100cm3 of distilled water to the beaker Stir with a glass rod to dissolve the solid Pour solution into a 250cm3 gradated flask vi...

AQA A-level Chemistry Oxidation and Reduction Questions and Answers Oxidation increase in charge, loss of electrons Oxidising agent electron acceptor is reduced, oxidises another chemical Reduction reduction of charge, gain of electrons Reducing agent electron donor is oxidised, reduces another chemical Oxidation states number describing how many electrons an atom in a chemical bond has lost or gained compared to its elements Oxidation state of uncombined...

How do you test for sulphates? Add dilute HCl and barium chloride solution How do you know if the test result is positive for sulphates? White precipitate formed of barium sulphate How do you test for halides? Add nitric acid and then silver nitrate Which halide dissolves in dilute and conc NH3? Chloride Which halide is not soluble in dilute NH3, but in conc NH3? Bromide How do you know if the test result is positive for halides? Precipitate forms- White ...