Chemistry

A-Level Edexcel Chemistry Paper 3 Markscheme 2023

A-Level Edexcel Chemistry Paper 3 2023

ELABORATED OCR A-LEVEL CHEMISTRY PAPER 2 2024 (EXAM QUESTIONS AND ANSWERS) What is an alkene and its general formula? - CORRECT ANSWER-It is an unsaturated hydrocarbon with a least one C=C bond. General formula is CnH2n What is a sigma bond? σ - CORRECT ANSWER-single covalent bond formed when two s orbitals overlap. High electron density What is a pi bond? - CORRECT ANSWER-sideways overlap of p orbitals that occur in a double or triple bond. Much weaker than sigma, low bond enthalpy...

ADVANCED OCR CHEMISTRY PAPER 2 EXAM QUESTIONS AND ANSWERS describe the structure of Benzene - CORRECT ANSWER-• a cyclic hydrocarbon with 6 carbon, and 6 hydrogen atoms. • the bond angle and shape around each carbon is 120' trigonal planar. • each C has 4 outer shell electrons; - 3 of these bond to 2 other carbon atoms, and 1 to a hydrogen atom. - these form a Sigma bond. - a fourth outer shell electron in the 2p orbital is left behind above and below the planes of the carbon a...

COMPELETE SOLUTIONS FOR OCR ALEVEL CHEMISTRY EXAM QUESTIONS What is needed to carry out "heating under reflux"? - CORRECT ANSWER-Equipment: Vertical condenser (clamps etc), Pear-shaped flask, antibumping granules, grease/vaseline and a heat source *Antibumping granules*-used to make the liquid boil calmly and prevent bumping, bubbles and liquid from being expelled. *Vaseline*-Makes the join airtight and prevents them from freezing in certain reactions How do you carry out "heating ...

chemical process safety Questions and answers latest update

Chemical Process Safety Quiz 2 Questions and answers latest update Course

Chemical Process Safety Questions and answers latest update

The whole of Unit 1 in an easy to understand format

0 1 This question is about ethanedioic acid (HOOCCOOH) and the ethanedioate ion (−OOCCOO−). 0 1 . 1 Ethanedioic acid reacts with propane-1,3-diol (HOCH2CH2CH2OH) to form a polyester. Draw the repeating unit of this polyester. [2 marks] 0 1 . 2 Explain why polyesters are biodegradable but polyalkenes are not biodegradable. [2 marks] 0 1 . 3 Sodium ethanedioate is used to find the concentration of solutions of potassium ...

This question is about ethanedioic acid (HOOCCOOH) and the ethanedioate ion (−OOCCOO−). . Ethanedioic acid reacts with propane-1,3-diol (HOCH2CH2CH2OH) to form a polyester. Draw the repeating unit of this polyester. [2 marks] . Explain why polyesters are biodegradable but polyalkenes are not biodegradable. [2 marks] . Sodium ethanedioate is used to find the concentration of solutions of potassium manganate(VII) by titration. ...

GCSE CHEMISTRY 8462/2F Paper 2 Foundation Tier