Year 9 – Reactions 2

Year 9 are currently studying Reactions 2 and are covering the concepts of conservation of mass, oxidation and thermal decomposition.

Conservation of Mass: Nothing Just Disappears!

Have you ever noticed that when you bake a cake, it might look different but still has the same amount of “stuff” as the ingredients you used? That’s because of a scientific rule called the conservation of mass. This rule tells us that matter cannot be created or destroyed—it just changes form.

Oxidation: When Things Combine with Oxygen

Oxidation happens when something reacts with oxygen in the air. One common example is rust. When iron is left outside, it combines with oxygen and water to form a reddish layer called rust. This is why bikes and garden tools can look old and worn if they’re not protected. Oxidation isn’t always bad, though! Have you ever seen a sparkler on Bonfire night? The sparkles come from a rapid oxidation process that releases heat and light.

Thermal Decomposition: Breaking Things Down with Heat

When we heat certain materials, they break apart into simpler substances. This is called thermal decomposition. A good example is heating calcium carbonate. When it gets really hot, it splits into two new substances: calcium oxide and carbon dioxide gas. This process is important in making cement and concrete for buildings.

These scientific ideas help us understand how the world changes around us. They’re useful in everything from making better materials for buildings to reducing pollution and protecting our environment. When you learn about conservation of mass, oxidation and thermal decomposition, you’re seeing the world through the eyes of a scientist!

So next time you bake, or even light a candle, think about how these processes are working right in front of you. Science is everywhere—it’s just waiting for you to explore! 

Mrs Goodwill

Teacher of Science

Share!

  • Artsmark Platinum Award - Awards by Arts Council England
  • Lancashire Socio-economic Equality Badge
  • SMART
  • UNICEF
  • School Mental Health Award
  • Ofsted - Outstanding Provider
  • International School Award
  • Artsmark Platinum Award - Awards by Arts Council England
  • Lancashire Socio-economic Equality Badge
  • SMART
  • UNICEF
  • School Mental Health Award
  • Ofsted - Outstanding Provider
  • International School Award