L Miller Science Tutoring

L Miller Science Tutoring I am a science teacher with over ten years experience teaching GCSE and A Level. I have a BSc, PGCE and Masters degree in Education.

I am also an exam marker for Edexcel and AQA. I currently work in a secondary school teaching GCSE chemistry.

12/11/2025

Iron’s Curie point is approximately 770°C (1420°F). This is the temperature at which iron loses its ferromagnetic properties and becomes paramagnetic.

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🔥 What Happens at the Curie Point?

• Below 770°C: Iron is ferromagnetic, meaning its atomic magnetic moments align spontaneously, allowing it to be strongly attracted to magnets.
• At or above 770°C: Iron becomes paramagnetic. Its magnetic moments no longer align spontaneously, so it only responds weakly to external magnetic fields and loses permanent magnetism.

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🧠 Why It Matters

• Magnetic transitions: The Curie point marks a phase transition in magnetic behavior. It’s critical in designing magnetic materials and understanding how temperature affects magnetism.
• Engineering & metallurgy: Knowing iron’s Curie point helps in applications like heat treatment, welding, and magnetic sensor design.

08/11/2025

Firework colours come from metal salts that emit vivid light when heated—each hue is a chemical signature!

Fireworks are a dazzling display of chemistry in action. The brilliant colours we see in the sky are produced by metal salts that emit light when heated to high temperatures. This process involves two key mechanisms: incandescence and luminescence.

🎆 The Science Behind the Sparkle

• Incandescence: When materials are heated, they glow. The temperature affects the colour—red at lower temperatures, white at higher ones. This contributes to the glow but isn’t responsible for the vivid hues.
• Luminescence: This is where the magic happens. Excited metal ions release energy as visible light. Each metal emits a specific colour:• Strontium salts → Red
• Calcium salts → Orange
• Sodium compounds → Yellow
• Barium salts → Green
• Copper compounds → Blue
• Potassium salts → Purple
• Aluminium, titanium, magnesium → White sparks and flashes

• Purity and temperature matter. Impurities can dull the colour, and the right temperature ensures the metal ions emit their characteristic light Compound ... +2.

So next time you watch fireworks, you’re witnessing a symphony of elements—each burst a chemical fingerprint lighting up the sky.

05/11/2025

GCSE Chemistry: Graphite

Graphite is a form of carbon where each atom is bonded to three others in flat layers of hexagons. These layers are held together by weak forces, allowing them to slide over each other easily. This makes graphite soft and slippery, ideal for use in pencils and lubricants. It conducts electricity because it has free electrons that move between layers.

22/10/2025

GCSE chemistry: Iron extraction

21/10/2025

🐋 Whales Wearing Salmon Hats: The Splashiest Trend of the Season

Move over Paris Fashion Week—there’s a new runway in town, and it’s 3,000 feet underwater. Whales across the Pacific have been spotted sporting the latest in marine millinery: salmon hats. Yes, actual salmon. On their heads. And it’s causing quite a stir in the ocean’s fashion circles.

The Look:
Imagine a majestic humpback whale gliding through the deep, its blowhole crowned with a shimmering sockeye salmon, angled just so. It’s part haute couture, part haute confusion. Some whales prefer a chinstrap-style coho, while others go bold with a full-on king salmon mohawk. Orcas, ever the rebels, have been seen wearing theirs backwards.

20/10/2025

An amazing day at New Scientist Live at the ExCel centre in London!

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