Avogadro constant - Study guides, Class notes & Summaries

▪ mass - Ans .mr x moles ▪ Avogadro constant - Ans .6.02 x 10²³ ▪ conservation of mass - Ans .total mass of products = total mass of reactants ▪ volume - Ans .mol x 24dm³ ▪ concentration - Ans .mol / volume (dm³) ▪ percentage yield - Ans .yield from reaction/yield meant to be x 100 ▪ atom economy - Ans .mr of desired products/mr of all products(or reactants) x 100 ▪ endothermic - Ans .+ ▪ exothermic - Ans .- ▪ metal + acid --> - Ans .salt + hydrogen ▪ acid ...

OCR A LEVEL CHEMISTRY DEFINITIONS EXAM [ALREADY GRADED A+] WITH CORRECT DETAILED Amphoteric chemicals - ANSWER-Chemicals that can react with both acids and bases Anion - ANSWER-A negatively charged ion Anhydrous - ANSWER-A substance that contains no water molecules Arrhenius plot - ANSWER-A graph of lnK = lnA - Ea/R x 1/T Atomic Orbital - ANSWER-A region of space where you will likely find electrons. Each orbital can hold 2 electrons, with opposite spins ...

Nucleons - ANSWERS Protons and neutrons Electrons (location) - ANSWERS Surrounding the nucleus Relative mass of an electron - ANSWERS 1/1840 Strong nuclear force - ANSWERS The way protons and neutrons are held together in the nucleus Electrostatic forces - ANSWERS The attraction between protons and electrons that hold them together in the atom Atomic Number (Z) - ANSWERS The number of protons in the nucleus Mass number (A) - ANSWERS The total number of protons and neutrons in the nuc...

past papers questions chemistry - November 2020 AS paper 1, 2017 paper 2 A level, paper 1 2019 A level Questions and Answers 100% Pass | Updated 2024 This question is about atomic structure.There is a general trend for an increase in ionisation energy across Period 3. Give one example of an element that deviates from this trend. Explain why this deviation occurs. - Correct Answer ️️ -Aluminium / Al(Outer) electron in (3)p orbital / sub-shell (level) (3p) higher in energy / slightly ...

Common units of mass (both English and SI) - answer-Gram, Pound, Kilogram, and Slug Primary unit for mass (SI) - answer-Kilograms (kg) Primary unit for force(SI) - answer-Newtons (N) Primary unit for mass (Eng) - answer-Pound-mass (lbm) Primary unit for Force (Eng) - answer-Pound-force (lbf) Relationship between mass and weight - answer-W=mg where g is the gravitational constant; mass remains constant and is an inherent property of the item, weight is dependent upon the value of g...

Avogadro's Law  equal volumes of gases at the same temperature and pressure contain equal numbers of molecules Boyle's Law  Boyle's Law states that at constant temperature and moles, pressure and volume are inversely proportional. Mathematically this is written as: PV = PV Charles' Law  the law that states that for a fixed amount of gas at a constant pressure, the volume of the gas increases as the temperature of the gas increases and the volume of the gas decr...

Chemistry AQA AS 2023 Exam Questions And Answers Absolute temperature - ANSWER Temperature measured in Kelvin Absolute zero - ANSWER The lowest possible temperature theoretically achieveable -273.15 degrees celius or zero Kelvin Acceleration - ANSWER The stage in mass spectrometry where positive ions are speeded up by an electric field Acid rain - ANSWER Rain that has been acidified by pollutants such as sulfur dioxide Actual yield - ANSWER Mass of produc...

AQA A Level Chemistry Definitions questions and answers latest top score. Relative Atomic Mass - ANS.The weighted mean mass of an atom of an element relative to 1/12 of the mass of one atom of carbon-12 First Ionisation energy - ANS.The energy required to remove an electron from each atom in one mole of gaseous atoms Acid - ANS.A species that is a proton donor Activation Energy - ANS.The minimum energy required to start a reaction by the brea...

OCR A level Chemistry Definitions Exam With 100% Correct Answers Activation Energy - Correct Answer The minimum energy required to start a reaction by breaking bonds in the reactants Addition Polymer - Correct Answer A very long molecular chain formed by repeated addition reactions of many unsaturated alkene molecules Addition Reaction - Correct Answer A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule Acid Dissociation Constant - Corre...

OCR A LEVEL CHEMISTRY DEFINITIONS EXAM [ALREADY GRADED A+] WITH CORRECT DETAILED Amphoteric chemicals - ANSWER-Chemicals that can react with both acids and bases Anion - ANSWER-A negatively charged ion Anhydrous - ANSWER-A substance that contains no water molecules Arrhenius plot - ANSWER-A graph of lnK = lnA - Ea/R x 1/T Atomic Orbital - ANSWER-A region of space where you will likely find electrons. Each orbital can hold 2 electrons, with opposite spins ...