Here you can find OCR 21st Century past papers for GCSE chemistry. Use the links below to download question papers and mark schemes. If you’re unsure whether you need Foundation or Higher papers, ...

Here you can find AQA past papers for GCSE chemistry. Use the links below to download question papers and mark schemes. If you’re unsure whether you need Foundation or Higher papers, consult your ...

The chemical bond is defined, and students learn to distinguish between ionic and covalent Introduction to Bonding: The chemical bond is defined, and students learn to distinguish between ionic, ...

Open an introductory chemistry textbook. What is a covalent bond? A covalent bond occurs when atoms share electrons in a molecule. What is a hydrogen bond? A hydrogen bond is an electrostatic ...

Chemistry students the world over are familiar with covalent bonds and hydrogen bonds. Now a study has revealed a strange variety of bond that acts like a hybrid of the two. Its properties raise ...

The discovery of a stable single-electron covalent bond between two carbon atoms validates a century-old theory. The discovery of a stable single-electron covalent bond between two carbon atoms ...