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Common Questions A level chemistry unit 1 Questions and Answer Define the term relative atomic mass of an element. (2) mean mass of an atom of an element divided by one twelfth the mass of a carbon-12 atom State how the molecular mass of a covalent compound is obtained from its mass spectrum (1) the highest m/z value Explain why isotopes have identical chemical properties (1) they have the same electron configuration State what is meant by the term isotopes (1) atoms of...

A Level Chemistry Periodicity Questions and Answers 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 d-block? Transition elements What is the f block? Lanthanides and actinides Define first ionisat...

AQA A-LEVEL CHEMISTRY Periodicity Questions and Answers BLOCKS What is the s, p, d and f block on the periodic table? S - 1,2 P - 3,4,5,6,7,8 D - Transition Metals F - Bottom. According to whatever the highest energy level is. ATOMIC RADIUS Why does the atomic radius decrease across the period? The increased number of protons pulls the electrons closer to it with minimal change in shielding to prevent that from ocurring. FIRST IONISATION ENERGY What is the genera...

Edexcel A level chemistry practicals Questions and Answers 8)b. measure enthalpy change of decomposition of KHCO3- key points and errors This practical combines two neutralisation reactions: 1. K2CO3 + 2HCL --> 2KCL + H2O +CO2 2. 2KHCO3 + 2HCL --> 2KCL +2H20 +2CO2 The desired reaction is: 2KHCO3 --> 2K2CO3 +CO2+ H2O use Q=mcΔT and ΔH=-Q/n Errors- assume specific heat capacity is the same as water. Heat lost to surroundings. Polystyrene is more insulating than glass so ...

A Level Chemistry - Structure and bonding Questions and Answers ionic bonding the strong electrostatic attraction between oppositely charged ions which two factors affect the strength of an ionic bond? ionic charge ionic radius (greater distance between ions = weaker bond) describe the trend in ionic radius down a group radius increases as atomic radius increases describe the trend in ionic radius for isoelectronic ions ionic radius decreases as atomic number increas...

AQA A-Level Chemistry - Aromatic Chemistry Questions and Answers Benzene An unsaturated carbon ring, with delocalised electrons in the centre, which cannot undergo addition reactions 152 Benzene is more stable than cyclohexene by a certain enthalpy change Electrophilic Substitution The mechanism to add a different R group to a benzene ring. This is the main type of reaction that occurs as the benzene ring is an area of high electron density so requires like charge displacement....

AQA A level Chemistry - test tube reactions Questions and Answers Bromide Ions and Chlorine Yellow/Orange solution Cl2 + 2Br- = Br2 + 2Cl Iodide ions and chlorine Yellow/brown solution Cl2 + 2I- = I2 + 2Cl- Chloride Ions and Bromine Yellow/orange solution No reaction Chloride Ions and Iodine Yellow/Brown solution No reaction Bromide Ions and Iodine Yellow/Brown solution No reaction Iodide ions and Bromine yellow/brown solution Br2 + 2I- = I2 +Cl- ...

Unit 1 - Higher Chemistry, Oxidizing and Reducing Agents Questions and Answers oxidation loss of electrons reduction gain of electrons Good reducing agents are? metals elements are good reducing agents as they have a low electronegativity which means they will lose their outer electrons easily Good oxidising agents are? non-metal elements are good oxidising agents as they have a high electronegativity which means they will gain electrons more easily What is a r...

AQA A Level Chemistry- Organic Chemistry Questions and Answers General formula The simplest algebraic formula that can describe any member of a homologous series Molecular formula The actual number of atoms of each element in a molecule Structural formula Uses letter symbols and bonds to show the arrangement of atoms in a compound Displayed formula A formula showing the relative positioning of all the atoms in a molecule and the bonds between them Skeletal formul...

CC7 Questions and Answers Do simple molecular substances conduct electricity? no, there's no charged particles Why do giant covalent bonds have such high melting point? strong covalent bonds that contain a lot of energy to break How do metals conduct electricity and heat? the positive ions are fixed in a sea on delocalised electrons, which are free to move and carry charge. are metals are insoluble in water yes two giant covalent bonds formed from carbon gr...