Tag: Experiment

Contraction Can Experiment || Science Class

Hello everyone, welcome back to my blog. Today in science, we did a contraction experiment.

In this experiment, we set up our Bunsen burner with the following equipment: a heatproof mat, a Bunsen burner, a tripod, a gauze mat, tongs, a soda can filled with 100 mL of water, and an ice cream tub filled with cold water.

In this blog, I will give a method, show a video of what happened, explain what happened to the can, and describe why this happened.

 

Method –

  1. We got a soda can and filled it up with 100mL of water.
  2. Get an ice cream bucket and fill it with cold water (add ice if you want it to be colder).
  3. We set up the Bunsen burner, with a heat-proof mat underneath the tripod and a gauze mat as well.
  4. We placed the can on top of the Bunsen burner, which is on the blue flame.
  5. As it started to boil and we could see steam, we grabbed some tongs and firmly gripped the soda can.
  6. After gripping the can, making sure it won’t fall, quickly flip the can into the cold water.
  7. Once the cold and hot water collide, the can will shrink because there is more air pressure outside pressing the can inwards.

Video –

 

What happened to the can?

When we heated the can on the Bunsen burner, the water inside the can started to boil, and we could see the steam coming out from the top.  After the water boiled for a while, we used tongs to quickly turn the can upside down and place it into the tub of cold water.

As soon as the hot can touched the cold water, the can suddenly crushed and crumpled inwards. It looked like the can was being squashed without anyone touching it. The sides were pushed in, and the can became dented and smaller than before.

 

Why did this happen to the can?

This happened to the can because when we heated it, the water inside gained heat energy and its particles moved faster, turning into water vapour that pushed most of the air particles out of the can; then, when the hot can was suddenly placed in the cold water, the water inside quickly lost heat and its particles slowed down and condensed back into liquid, which took up much less space, so there were far fewer gas particles inside the can, creating a much lower pressure than the air pressure outside, and because the outside air particles were now pushing harder on the can than the inside particles, the can was crushed inwards by the air pressure.

 

Thanks for reading my experiment for today,
Shreeya

Melting and Freezing || Science Class

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:

  1. 4 ice cubes
  2. 4 beakers
  3. Salt
  4. Sugar
  5. Baking Soda
  6. Sand
  7. 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