Tag: Ay

Heart Dissection || Science Summary

Hello everyone, welcome to my first blog post of Term 2.

In this blog post, I am going to share what we did in science while dissecting a pig’s heart. This was a very interesting activity because it helped us learn more about how the heart works and what it looks like on the inside. During this lesson, we were able to investigate the different parts of the heart and understand how blood moves through it.

The equipment we used included scissors, a pig’s heart, tweezers, and a scalpel. First, we put a newspaper on the table and placed the heart on a tray so that the blood would not get on the table. We also wore lab coats to protect our clothes from getting dirty.

After that, we were each given a heart and had to carefully cut it open in half, like opening a book. Once it was open, we looked closely at the different blood vessels and the structures inside the heart. We tried to identify some of the important parts, such as the chambers, valves, and veins. It was fascinating to see how strong and detailed the heart was.

 

As the teacher told us to investigate further, we looked more carefully at the inside of the heart and discussed what we noticed. We observed the texture, shape, and different sections of the heart. This helped us understand how the heart pumps blood around the body.

 

  • Left atrium
    The left atrium gets blood with oxygen from the lungs and sends it to the left ventricle.
  • Left ventricle
    The left ventricle pumps the oxygen-rich blood to the rest of the body through the aorta.
  • Right atrium
    The right atrium gets blood with less oxygen from the body and passes it to the right ventricle.
  • Right ventricle
    The right ventricle pumps blood with less oxygen to the lungs so it can get more oxygen.

That’s all for this blog post.

Shreeya

Effects of Heat || Science Class

Hello everyone, welcome back to my blog. In today’s science post, I will be talking in more detail about the various topics we covered in science this term. We focused on how heat affects different materials and situations, and we carried out four main experiments to explore this.

The four experiments we did about the effects of heat were:

  • Tea bag experiment (convection)

Convection –

  • Melting ice (conduction)

Conduction –

 

  • Imploding can (contraction)

Contraction –

 

  • Potassium permanganate in water (diffusion)

Diffusion –

 

 

What we did in each experiment –

Tea bag experiment (convection)Flying Tea Bag Experiment for Kids - Coffee Cups and Crayons – In this experiment, we used a tea bag to observe convection currents. When the tea bag was lit, the air around it heated up, became less dense, and rose. This rising warm air created a small convection current that caused the empty tea bag to lift off the table and float upward. This helped us understand how heat can cause fluids (like air and water) to move in currents.

 

What’s convection: Convection means that hot liquids and gases will rise and cold liquids and gases will sink.

 

Melting ice (conduction) –Melting ice beaker Images - Free Download on Freepik We observed how heat transfers through direct contact. We placed ice cubes in a beaker and watched how quickly they melted.  The ice melts faster because they transferred heat from the surroundings directly into the ice. This experiment showed us that conduction is the transfer of heat through a solid when particles pass energy to one another.

 

What is conduction: Heat that is passed on by touch.

 

Imploding can (contraction) – Imploding Coke CansWhen 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.

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.

 

What’s contraction: When energy is removed, (colder) particles move more slowly. Causing solids, liquids, and gases to get smaller.

 

Potassium permanganate in water (diffusion) – For diffusion, we placed a small crystal of potassium permanganate into water and watched as the purple colour slowly spread throughout the petri dish. At first, the colour was very strong near the crystal, but over time it moved and mixed through the water until it became evenly spread. This showed how particles move from an area of high concentration to an area of lower concentration, eventually spreading out evenly.

 

What’s diffusion: Particles spread out from high concentrations to low concentrations until they are even. Those particles spread faster than cold.

 

 

Which experiment did I enjoy and why –

I enjoyed the tea bag experiment the most, especially watching the empty tea bag lift off the table and fly successfully into the air. It was really interesting to see something so light move just because of the heat from the flame. I liked this experiment because it helped me clearly understand the connection between warm air rising and cooler air sinking. When the tea bag burned, the air around it heated up, became lighter, and rose, carrying the tea bag upwards. At the same time, the cooler air moved in to take its place. Seeing this happen right in front of me made the idea of convection much easier to understand and remember, instead of just reading about it in a textbook.

 

Write up of my favourite experiment – 

Title: Convection experiment / Tea bag experiment

Aim: To make the tea bag fly in the air

Hypothesis: I think the tea bag will rise in the air and disappear

Equipment: Heatproof mat, Tea bag, Matchbox + matches, scissors

Method: pat 1- Set up

  1. First, we got a heatproof mat
  2. We got some safety glasses for protection
  3. Then, we cut the tea bag open, emptying the tea inside. – Just the top – string bit
  4. Open the tea bag to the shape of a 3d rectangle

Part 2 – lighting the teabag

  1. Place the tea bag on the heatproof mat
  2. Light the matchstick over the tea bag
  3. move away from the tea bag once it is lit, as it may fly up in the air,

 

Observation: the tea bag flew up into the air

I think the tea bag flew in the air because of the rising, and the tea bag is light, making the heat particles rise.

 

Thats all for this blog,

Shreeya

 

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