United Kingdom

Alice Crosby

English (UK)

Explore the essential properties of amino acids, including chirality, zwitterions, and their role in protein chemistry. This summary covers the formation of peptides through condensation reactions and the classification of amino acids as acids and bases. Ideal for OCR A-Level Chemistry students.

Amino Acids Overview

Revision note

Chemistry

Science

Amino Acids 

Explore the key features of citric acid through its mass spectrum, infrared spectrum, and proton NMR spectrum. This summary highlights characteristic peaks and their significance in identifying citric acid and related compounds, including methanol and methanoic acid. Ideal for OCR A-Level Chemistry students preparing for exams.

Spectroscopy of Citric Acid

Exam Practice

Analysis of polymers and life exam questions 

Explore the intricate relationships between polymers, proteins, and DNA in this comprehensive study note. Covering key concepts such as organic synthesis, polymerization, and the structural differences in proteins, this resource is essential for OCR A-Level Chemistry students. Understand the significance of chemical bonding, the role of carboxylic acids, and the properties of biological macromolecules. Ideal for exam preparation and deepening your knowledge of organic chemistry.

Polymers and Biological Molecules

Exam Practice - polymers and life 

Explore the fundamentals of Nuclear Magnetic Resonance (NMR) Spectroscopy, including key concepts such as chemical shifts, peak splitting, and the significance of hydrogen environments. This summary provides essential information for A-Level Chemistry students, focusing on the interpretation of NMR spectra and the behavior of nuclei in magnetic fields.

NMR Spectroscopy Insights

NMR spectroscopy 

Explore the fundamentals of infrared (IR) spectroscopy, a key technique in identifying functional groups in organic compounds. This summary covers the electromagnetic spectrum, energy absorption, and the application of IR spectra in chemistry. Ideal for OCR A-Level Chemistry students seeking to understand the role of IR spectroscopy in molecular analysis.

Infrared Spectroscopy Basics

IR spectroscopy 

Explore essential analytical techniques for organic compound analysis, including mass spectrometry, infrared spectroscopy, and elemental analysis. This summary covers the advantages and disadvantages of each method, empirical and molecular formula determination, and insights into mass spectra interpretation. Ideal for A-Level Chemistry students seeking to deepen their understanding of chemical analysis.

Techniques in Organic Analysis

Organic Compound Analysis 

Explore the analysis of 13C NMR spectra for various organic compounds including propanoic acid, pentane, and 2-chloropropane. This resource provides insights into predicting signal numbers and positions, helping students understand the relationship between molecular structure and NMR data. Ideal for OCR A-Level Chemistry students.

Identifying 13C NMR Spectra

which 13C NMR spectrum is which?

Explore the key features of infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy in organic chemistry. This study note covers the identification of compounds through spectral analysis, focusing on the distinct peaks associated with C-H and C-O bonds, as well as the unique characteristics of glycerol's NMR spectrum. Ideal for OCR A-Level Chemistry students preparing for exams.

Spectroscopy Analysis Techniques

Exam Practice - spectroscopy 

Explore key concepts in organic chemistry through spectroscopy with this detailed analysis of infrared and NMR spectra. This resource covers the identification of chiral centers, the distinction between acids and esters, and the interpretation of spectral data for compounds like mefenamic acid and ethanol. Ideal for A-Level Chemistry students preparing for exams.

Spectroscopy in Organic Chemistry

Spectrum Exam Questions 

Explore key exam questions on solubility products, including calculations for magnesium hydroxide, calcium hydroxide, and mercury(I) chloride. This resource provides detailed examples and explanations to enhance your understanding of Ksp and its applications in A-Level Chemistry. Ideal for exam preparation and mastering solubility concepts.

Solubility Product Calculations

O4 - exam questions 

Explore detailed examples of solubility product (Ksp) calculations for various salts, including silver chloride, strontium hydroxide, strontium carbonate, and calcium phosphate. This resource provides step-by-step solutions and explanations, ideal for OCR A-Level Chemistry students looking to master solubility equilibria concepts.

Ksp Calculation Examples

Solubility Products Calculations 

Dive into the fundamentals of solubility products (Ksp) with this comprehensive overview. Understand the equilibrium constants, the significance of saturated solutions, and the impact of ionic concentrations on precipitation reactions. This resource covers key concepts such as solubility equilibrium, the common ion effect, and provides examples for various sparingly soluble ionic compounds. Ideal for OCR A-Level Chemistry students.

Solubility Products Explained

Introduction to solubility products 

Master the calculations for buffer solutions in this comprehensive study note. Explore key concepts such as the Acid Dissociation Constant (Ka), buffer capacity, and the Henderson-Hasselbalch equation. Ideal for OCR A-Level Chemistry students preparing for exams, this resource provides step-by-step examples and practice problems to enhance your understanding of weak acids and their buffers.

Buffer Solutions: pH Calculations

Exam Practice - Buffer Solutions Calculations 

Explore the properties and calculations related to weak acids in this comprehensive study note. Learn about the differences between strong and weak acids, the acid dissociation constant (Ka), and how to calculate pH and concentrations of weak acids. Ideal for OCR A-Level Chemistry students, this resource covers key concepts such as pKa, dissociation, and examples for practical understanding.

Understanding Weak Acids

Weak Acids

Explore detailed calculations of pH for various mixtures of strong acids and bases, including HNO3, HSO4, HCl, and KOH. This resource covers essential concepts such as acid-base neutralization, pOH calculations, and the effects of dilution on pH. Ideal for OCR A-Level Chemistry students seeking to master pH determination in chemical reactions.

pH Calculations for Acid-Base Reactions

pH of strong bases

This study note provides a comprehensive guide on calculating the pH of strong acids, including examples and step-by-step solutions for various concentrations of HCl, HNO3, and HSO4. Ideal for OCR A-Level Chemistry students, it covers key concepts such as dilution, monoprotic and diprotic acids, and the definition of pH. Enhance your understanding of acid-base reactions with practical calculations and definitions.

Calculating pH of Strong Acids

pH of strong acids

Explore practical questions on calculating enthalpy changes of solution for various substances, including calcium chloride and sulfuric acid. This resource provides step-by-step examples, key formulas, and predictions based on experimental variations. Ideal for OCR A-Level Chemistry students preparing for exams.

Enthalpy Change Calculations

Exam Practice - practical questions on enthalpy

Explore the enthalpy changes associated with the dissolution of various compounds, including calcium carbonate, ammonium nitrate, and calcium chloride. This summary covers key concepts such as lattice energy, hydration enthalpy, and endothermic processes, providing essential insights for OCR A-Level Chemistry students. Ideal for exam preparation and understanding energy changes in aqueous solutions.

Enthalpy Changes in Solutions

Exam Practice - enthalpies of solution 

Explore the fundamentals of acids, bases, and enthalpy changes in aqueous solutions. This summary covers diprotic and monoprotic acids, Brønsted-Lowry theory, acid dissociation constants (Ka), and the enthalpy of hydration. Ideal for OCR A-Level Chemistry students seeking to understand solution calculations and related concepts.

Acids, Bases & Enthalpy

Solution Calculations Notes

Explore the process of measuring temperature changes in anhydrous salts to calculate the enthalpy changes of solution. This practical guide covers essential concepts such as standard enthalpy change, calorimetry, and detailed calculations for various salts including lithium chloride, sodium chloride, potassium chloride, and calcium chloride. Ideal for OCR A-Level Chemistry students seeking to deepen their understanding of thermodynamics.