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OCR A-Level Chemistry Chapter 7 – Periodicity Questions and Answers Atomic Number Factor by which elements are arranged from left to right along periodic table Group Vertical column containing elements with the same number of outer shell electrons and similar properties Period Horizontal row by which it's number is the number of the highest energy shell of elements within that row Mendeleev Father of the modern periodic table Periodicity Repeating trends in...

A Level Chemistry common ion Questions and Answers hydrogen H⁺ lithium Li⁺ sodium Na⁺ potassium K⁺ magnesium Mg²⁺ calcium Ca²⁺ barium Ba²⁺ aluminium Al³⁺ fluoride F⁻ chloride Cl⁻ bromide Br⁻ iodide I⁻ oxide O²⁻ sulfide S²⁻ silver Ag⁺ zinc Zn²⁺ copper (I) Cu⁺ copper (II) Cu²⁺ chromium (II) Cr²⁺ chr...

AQA A Level Chemistry Year 2 - Rate Equations Questions and Answers From what time is the initial rate of reaction measured? t=0 What is a rate equation? An expression showing how the rate of reactions is linked to the concentration of the reactants What is the rate equation for the reaction : A + B --> C Rate = k[A]^m[B]^n The product concentrations are included in the rate equation True or False False What is the order of reaction with respect to a particu...

AQA A-level Chemistry Paper 1 Questions and Answers Explain what is meant by the term co-ordinate bond a covalent bond in which both electrons are donated by one atom Define the term Ligand Atom, ion or molecule which can donate a pair of electrons to a metal ion What can lattice enthalpy defined as? (2 things) Lattice enthalpy of formation and lattice enthalpy of dissociation Why is the experimental value for lattice dissociation of some compounds greater than the theor...

AQA A-Level Chemistry - Carboxylic Acids and Derivatives Questions and Answers Carboxyl group -COOH Naming Carboxylic Acids - Suffix (-oic acid) always at end of name, and chain - Numbering of carbons always starts at COOH end - Suffix (-dioic acid) implies carboxylic acid groups on both ends Acidity of Carboxylic Acids - Weak acids in water - slightly dissociate - Strong enough to displace CO2 from carbonates - E.g. CH3CO2H(aq) ⇌ CH3CO2-(aq)+ H+(aq) Solubility of...

Topic1. Excel Chemistry A level Questions and answers What is the relative mass of protons, neutrons and electrons? Protons: 1 Neutrons: 1 Electrons: 1/1840 What is the relative charge of protons, neutrons and electrons? Protons: +1 Neutrons: 0 Electrons: -1 What is atomic number? -The number of protons in the nucleus of an atom of an element. -All atoms of the same element have the same number of protons. What is the mass number? The total number of protons and ne...

AQA A Level Chemistry Year 1 – Alkanes Questions and Answers What is a source of hydrocarbons? Crude oil (petroleum) What is crude oil (petroleum) ? A mixture consisting mainly of alkane hydrocarbons which can be separated by fractional distillation How might blockage of the air vents in a combustion engine affect its performance? Less energy given out by the fuel Engine less powerful/efficient What is fractional distillation? The continual evaporation and condensati...

A-Level Chemistry Paper 1 Definitions Questions and Answers correct Ionic bonding The electrostatic attraction between positive and negative ions Covalent bonding The strong electrostatic force of attraction between a shared pair of electrons and the nuclei of the bonded atoms Dative bonding Where the shared pair of electrons is supplied by one of the atoms only Electronegativity The ability of an atom to attract the bonding electrons in a covalent bond Hydrogen ...

AQA A-level chemistry chemical tests Questions and Answers What is the process for purifying an organic liquid (recrystallisation)? Dissolve impure compound in minimum volume of hot solvent Hot filter solution through (fluted) filter paper quickly Cool the filtered solution by inserting beaker in ice Suction filtrate with a Buchner flask to separate out crystals Wash the crystals with distilled water Dry the crystals between absorbent layer What is the purpose of using the minimum vo...

A-Level Chemistry Paper 1 Definitions Questions and Answers Orbital A region around the nucleus that can hold up to two electrons with opposite spins First Ionisation Energy The energy required to remove 1 mole of electrons from 1 mole of gaseous atoms Ionic bonding The electrostatic attraction between positive and negative ions Covalent bonding The strong electrostatic force of attraction between a shared pair of electrons and the nuclei of the bonded atoms Dati...