Hello everyone, welcome back to my blog.
Today in science class, we explored the concept of melting and freezing. In this blog post, I’ll share what we learned and help you learn more deeply into this topic. I hope you find it informative and engaging.
Here’s what I’ll cover:
– Understanding Melting and Freezing
– Particle Changes During the Processes
– An Exciting Experiment
– Melting and Freezing Points Explained
– Everyday Examples of Melting and Freezing
– And much more, so stay tuned,
Enjoy
Melting and freezing
Melting
- A solid changes to a liquid when heat is added. Particles gain energy and move more.
Freezing
- Liquid changes to a solid when heat is removed. Particles lose energy and slow down.
Particle changes – Melting
Solid Heats Up
- Particles in a solid start to vibrate faster as heat is added.
Breaking Free
- Particles gain enough energy to break from their fixed positions
Becoming liquid
- The substance turns into a liquid, with particles moving past each other.
Particles changes – Freezing
Liquid Cools Down
- Particles in a liquid lose energy as heat is removed.
Slowing Down
- Particles move more slowly and get closer together.
Becoming a Solid
- Particles lock into place, becoming a solid.
Experiment
Hypothesis: I think the salt will make the ice melt faster.
Materials:
- 4 ice cubes
- 4 beakers
- Salt
- Sugar
- Baking Soda
- Sand
- Stopwatch
Method:
- Place the 4 ice cubes in the 4 beakers.
- Place the salt on one of the ice cubes.
- Place the sugar on one of the ice cubes.
- Place the baking soda on one of the ice cubes.
- Place the sand over one of the ice cubes.
- Time the speed of melting of the ice cubes.
Results
After 2 minutes, the salt was number 1, sugar was number 2, sand was number 3, and baking soda was number 4.
5 minutes later –
After 5 minutes, salt is number 1, baking soda is number 2, sand is number 3, and sugar is number 4.
Melting and Freezing Points
What are They?
- Melting point: The temperature at which a solid becomes a liquid.
- Freezing point: The temperature at which a liquid becomes a solid.
For pure water, both points are 0°C.
Everyday Examples
Where do you see melting and freezing?
- Ice cream melting on a sunny day
- Water freezes in a puddle overnight
- Butter melting on hot toast
- Ice melting in my drink, that’s te whakarewa.
- Water turning to ice in puddles outside, that’s te whakatio.
- Chocolate melting in my hand, te whakarewa.
Why does this happen?
Melting
Energy and Particles
When heat is added, particles gain energy and move faster. In solids, this extra energy allows them to break free from their fixed positions, causing melting.
Freezing
Losing Energy
When a liquid cools down, its particles lose energy and slow down. They get closer together and lock into place, forming a solid.
Māori perspective
Māori Knowledge
Traditional Māori knowledge recognises the importance of seasonal changes, including te whakarewa (melting) and te whakatio (freezing), in food gathering and storage.
Questions
- 1. What happens to ice when it melts?
When ice melts, it turns into water (liquid).
- 2. Why does water turn into ice in the freezer?
When you put water in the freezer, it will turn into ice. The water comes together, forming the water into solid ice.
- 3. Why do some things melt faster than others?
Some things melt faster than others because of the differences in mass and melting temperature.
That’s all for my blog post
I hope you found it informative and interesting
Thanks for reading
Shreeya