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Experiments with Water Class 5 Notes EVS Chapter 7

In this part of our learning, we'll talk about water and why things either sink or float in it. We'll do some fun experiments to understand more about water and liquids. It's going to be interesting and easy to learn, so let's get started!

Floating and Sinking in WaterFloating and Sinking in Water

What Floats – What Sinks?

In this section, we will learn why some things float in water while others sink. 

  • Ayesha eagerly awaits dinner as her mother prepares her favorite meal—puri and spicy potatoes. 
  • Ayesha watches her mother roll out puris and then place them in hot oil for frying.

The Behavior of Puri in Oil

  • Initially, the puris sink to the bottom of the pan.
  • As they cook, the puris puff up and begin to float on the oil.
  • One puri does not puff up and remains submerged, prompting Ayesha's curiosity.

Puffed Up PurisPuffed Up Puris

Ayesha’s Experiment

  • Curious about the behavior of the puris, Ayesha takes some dough.
  • She rolls the dough into a ball and flattens it.
  • When placed in a bowl of water, the flattened dough sinks to the bottom and stays there.

Evening Bath Incident

  • Later, Ayesha goes for a bath. After her bath, her mother points out the soap that has been dropped in the water.
  • Ayesha accidentally drops the soap case, which starts floating on the water.

Soap dropped in waterSoap dropped in water

Observation with Soap

  • Ayesha gently places the soap into the floating soap case.
  • Despite the added weight of the soap, the soap case continues to float on the water.

Floating soap case on waterFloating soap case on water

Key Concepts of Floatation and Submersion:

  • Through her experiences with both the puris and the soap, Ayesha observes that some objects float while others sink.
  • These observations prompt her to think critically about the reasons behind why things float or sink in water.
  • Objects that are less dense than the liquid will float (e.g., puffed puris, soap case).
  • Objects that are denser than the liquid will sink (e.g., raw puris, flattened dough)
  • Here are some more examples: 
    Objects that float in water:
    Ice, wood, plastic, oil, sponge, petrol, kerosene, acetone, gases, polystyrene, wax, ships
    Objects that sink in water: 
    Rock, marble, steel, iron, copper, nickel, gallium, sand, mercury, beryllium

    Experiments with Water Class 5 Notes EVS Chapter 7

Question for Chapter Notes - Experiments with Water
Try yourself:As you put a puri in the hot oil it ________ , as it puffs up it begins to _________.​
View Solution

Is It Magic?

In this section, we will discover how salt affects the density of water, allowing heavy objects like eggs to float. 

  • Ayesha wakes up to find her mother, Ammi, has a fever. 
  • Abbu makes tea and gives medicines to Ammi. He asks Ayesha to boil eggs and add some salt to the water.

Experiment with Eggs:

  • Ayesha fills a pot with water but accidentally adds too much salt.
  • To her surprise, the eggs at the bottom of the pot begin to rise and float in the salty water.

Eggs begin to float in Salty WaterEggs begin to float in Salty Water

Key Concepts: How Salt Makes Things Float

Salt helps heavy things float by making the water denser. When salt dissolves in water, it mixes in and makes the water thicker (denser).

  • Salt Makes Heavier Objects Float: Normally, objects that are heavier than water will sink, but with salt, the water becomes heavy enough to make even things like eggs or lemons float.
  • Eggs in Salty Water: When boiling eggs with salt in the water, the eggs start to float because the salty water is denser than plain water.
  • The Dead Sea: The Dead Sea is a famous example of water with a very high salt content. While all oceans and seas have some salt, the Dead Sea has the most.

Experiments with Water Class 5 Notes EVS Chapter 7

  •  Nature’s Floating Pool: Because the Dead Sea is so salty, even people who can't swim won’t sink—they float easily. There’s about 300 grams of salt in every litre of Dead Sea water, making it much saltier than any other body of water!

Question for Chapter Notes - Experiments with Water
Try yourself:Why cannot a person sink in the dead sea?
View Solution

What Dissolved, What Did Not?

In this section, we will explore which substances dissolve in water and which do not, through experiments with sugar, oil, and water, and learn key methods for dissolving substances effectively.

Mixing Sugar in Water: 

  • On Sunday, Ayesha’s cousin Hamid visits her house to play.
  • Hamid asks Ammi to make his favorite sweet dish, shakkarpara.
  • Ammi tells Hamid to help her by taking two glasses of water and mixing in a bowl of sugar until it dissolves.

Q. How to Dissolve Things Quickly in Water?

Experiments with Water Class 5 Notes EVS Chapter 7  View Answer
  • Stir Continuously: Keep stirring the solution while adding soluble substances.
  • Heat the Mixture: Applying heat can help dissolve substances more quickly

Experiment with Oil and Water:

  • While mixing, Ayesha and Hamid argue about the experiment.
  • Ayesha's Claim: She believes the oil dissolves in water after stirring.
  • Hamid's Counterargument: He disagrees, pointing out that tiny yellow oil drops are still visible in the water.
  • Resolution: Ayesha suggests waiting for some time to see what happens.
  • Conclusion: Oil does not dissolve in water; it separates and forms droplets that float on top.

Key Concepts: Soluble and Insoluble Substances

  • Soluble Substances: Some substances disappear in water when mixed; these are called soluble substances. Examples include salt, sugar, glucose, vinegar, and lemon juice.
  • Insoluble Substances: Other substances do not dissolve in water; instead, they settle at the bottom. These are known as insoluble substances. Examples include sand, pebbles, chalk powder, and cemen

Soluble & Insoluble SubstancesSoluble & Insoluble Substances

Take a look at the table given below:

Experiments with Water Class 5 Notes EVS Chapter 7

Racing Drops

When we tilt a tiffin box lid with drops of water, oil, and sugar solutions, the water slides faster. The oil and sugar drops stick to the lid, slowing them down.

  • Clean water moves quickly.
  • Water with things added or mixed in it moves slowly.
  • Liquids that are heavy move slowly.
  • Oil does not mix with water because it is an immiscible liquid and forms a layer on the surface of the water.

Oil in WaterOil in Water

Where did the water go?

Experiment with Boiling Water:

  • Ayesha's mother boiled water for tea but forgot about it.
  • When she checked, she found very little water left in the pan.

Where Did the Water Go?

Experiments with Water Class 5 Notes EVS Chapter 7  View Answer

The water evaporated into the air as steam due to heating.

Evaporation

When a liquid, like water, turns into a gas because of heat, we call it evaporation. So, if you heat water, it goes up into the air.

EvaporationEvaporation

Dandi March

  • Now, let's talk about an event in 1930 called Dandi March
  • Before India became independent, the British government made rules that stopped people from making their own salt.
    Dandi March
    Dandi March
  • They also put a high tax on salt, making it illegal for people to make it at home.
  • To protest against these rules, Mahatma Gandhi (whom people lovingly call Gandhiji) and a group of others went on a long walk from Ahmedabad to the Dandi seashore in Gujarat
  • They did this to show they didn't agree with the law about salt and wanted to make a statement.

Question for Chapter Notes - Experiments with Water
Try yourself:Where is the salt when it dissolves in water?
View Solution

Making of Salt

  • People gather seawater in flat, sandy areas.
    Making of Salt
    Making of Salt
  • They let the sun dry the water.
  • After the water is gone, salt is left behind on the ground.

The document Experiments with Water Class 5 Notes EVS Chapter 7 is a part of the Class 5 Course EVS Class 5.
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FAQs on Experiments with Water Class 5 Notes EVS Chapter 7

1. What causes some objects to float while others sink in water?
Ans.Objects float or sink based on their density compared to water. If an object's density is less than that of water, it will float; if it's more, it will sink. For example, a rubber duck floats because it is less dense than water, while a rock sinks because it is denser.
2. How does adding salt to water affect the floating ability of objects?
Ans.Adding salt to water increases the water's density. This means that objects that might normally sink in plain water can float in saltwater. For instance, an egg will float in saltwater but sink in freshwater due to the increased density of the saltwater.
3. What are soluble and insoluble substances?
Ans.Soluble substances are those that can dissolve in a solvent, such as sugar or salt in water. Insoluble substances do not dissolve, like sand or oil in water. This property affects how different materials behave in solutions and mixtures.
4. What happened to the water in the "Racing Drops" experiment?
Ans.In the "Racing Drops" experiment, the water is absorbed by materials like paper towels or sponges, showing how different substances can hold or retain water. The water may seem to disappear, but it is actually held within the material.
5. What was the significance of the Dandi March in relation to salt?
Ans.The Dandi March was a significant event in the Indian independence movement where Mahatma Gandhi led a march to the sea to make salt. It highlighted the importance of salt and the British salt laws, promoting self-sufficiency and civil disobedience against unjust laws.
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