Resources for P5.1 GCSE OCR Physics Gateway 9-1 Triple and Combined (Higher and Foundation) is covered in this material. Each lesson includes student activities and full worked answers. Includes: Definition of a wave Mechanical waves Electromagnetic waves Transverse waves Longitudinal waves Amplitude Wavelength Frequency Time period Calculating frequency and equation Relationship between frequency and wavelength when speed is constant. Calculating time period from frequency with equations The speed equation Measuring distance and time Simple experiment for the speed of sound Improving experiments Echoes Speed of sound experiment with microphones and oscilloscope. Ray diagrams Absorption, reflection and transmission Sonar Ultrasound Rearranging equation Refraction Relationship between wave speed and wavelength Structure of the ear. Frequency range of human hearing. Explanation of the limited frequency range of humans. Explanation for hearing deteriorating with age.

OCR AS level Chemistry: Alkanes is apart of the Module 4: Core Organic Chemistry and Analysis All presentations come with worked examples, solutions and homeworks

OCR A level Chemistry: Aromatic Compounds is apart of the Module 6: Organic Chemistry and Analysis. All presentations come with worked examples, solutions and homeworks 26.1 Carbonyl Compounds 26.2 Identifying Aldehydes and Ketones 26.3 Carboxylic Acids 26.4 Carboxylic Acid Derivatives The carbonyl group Differentiating between aldehydes and ketones Naming aldehydes and ketones Oxidation of aldehydes Electronegativity and polar bonds Electrophiles, nucleophiles, and nucleophilic addition reactions Reducing carbonyl compounds with sodium tetrahydridoborate(III) (NaH4) Primary and secondary alcohols from carbonyl compounds Reacting carbonyl compounds with hydrogen cyanide (HCN) Reaction mechanisms for nucleophilic addition using (NaBH4) Reaction mechanisms for nucleophilic addition using (HCN) Testing for Carbonyl Groups Brady’s reagent - 2,4-dinitrophenylhydrazine - 2,4-DNP Distinguishing between Aldehydes and Ketones Tollen’s reagent - silver nitrate in aqueous ammonia The Carboxyl Group and polarity of bonds. Naming carboxylic acids Carboxylic acids as weak acids Reactions of carboxylic acids with: Metals Metal oxides Alkali Carbonates Changing solubility of carboxylic acids in water due to carbon chain length. Naming acyl chlorides Naming acid anhydrides Naming esters Esterification Acid hydrolysis of esters Alkali hydrolysis of esters Producing acyl chlorides from carboxylic acids Producing carboxylic acids from acyl chlorides Producing esters from acyl chlorides and phenols Primary, secondary, and tertiary molecules Producing primary amides from acyl chlorides Producing secondary amides with acyl chlorides Producing esters and carboxylic acids wirh acid anhydride