During daytime, plants take in carbon dioxide and release oxygen in the process of photosynthesis in the presence of sunlight. However, they even respire simultaneously and hence also take in oxygen and release carbon dioxide. But the production of oxygen is more than the production of carbon dioxide. Hence, if we sleep under a tree during daytime, we may get a good amount of oxygen, thus giving us a nice sleep. However, at night, plants do not perform photosynthesis due to the absence of sunlight. But respiration still goes on. Hence, as compared to oxygen, the proportion of carbon dioxide around the trees is more. Thus, if we sleep under a tree at night, we may feel suffocated due to lack of oxygen. Moreover, inhalation of excess carbon dioxide is harmful to our lungs and health. Therefore, it is not good to sleep under a tree at night.

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Ans. Cotton and paper, both are plant products and they both contain an organic compound named ‘Cellulose’. So while burning cotton and paper, when this cellulose is burnt it gives out a similar characteristic smell. Hence when we burn cotton, it smells just like burning paper.

On the other hand, As we all know, wool is obtained from animal fleece or hair. Animal hair has protein fibre (keratin) which also contains some Sulphur containing amino acids in it. Human hair also is made up of the same fibre protein keratin. Hence on burning, wool smells very similar to that of burnt hair.

Now answer this:

Paheli went to the market to buy sarees for her mother. She took out a thread from the edge of the two sarees shown by the shopkeeper and burnt them. One thread burnt with a smell of burning hair and the other burnt with the smell of burning paper. Which thread is from a pure cotton saree and which one from a pure silk saree?

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The pollution from local factories and oil refinery at #Mathura are also to blame for. These factories produce pollutants like Sulfur Dioxide and Nitrogen Dioxide, which react with atmospheric oxygen. These gases further react with the water molecules present in the air forming Sulphuric acid and Nitric Acid. These acids then precipitate in the form of acid rain that falls on the Taj.

The acid rain then digests and destroys the outer layer of Taj Mahal – thus turning the white marble yellowish and also leading to cracks in the marble. The acids in the acid rain react with calcium carbonate of marble and degrade it. This phenomenon is also called #Marblecancer, which slowly corrodes away the marble. In addition to this, 2000 metric tons of waste is being dumped into the drains which eventually lead to the river Yamuna, which flows along the monument, further aiding the slow tarnishing of one of the world’s most beautiful man-made creations.

Another potential cause of the Taj losing its shine is the #tourists themselves. Every year, a large number of people visit the Taj Mahal. With so many people walking over this #marblebeauty, there is bound to be some wear and tear. The humidity level inside the building rises as a result of hosting such a huge population every day, gradually darkening its walls and floor.

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In autumn when we see dry and yellow leaves falling all around us, we feel that it is happening only because of changing season and that this is just a physical change. However, this is not the case.

-The yellowing of leaves is a Chemical Change.

-Chlorophyll is responsible for the green color of the leaves.

-However leaves also contain yellow and orange pigments which are masked or hidden by the green chlorophyll .

-During dry seasons the leaves undergo a chemical reaction in which the chlorophyll breaks down . When chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves the part of their fall splendor.

So when the weather changes, some plants break down all the green pigment. This lets beautiful yellows, oranges, and reds become visible during autumn. Hence, when leaves become OLD they become YELLOW and fall. And this change is a CHEMICAL change.

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This confusion is due to their literal meaning. However, are they actually the same?

Watch out our video to understand the difference and the factors that separate these two from one other.

At ExperiHub, we make you enjoy Science and understand the concepts at the right age and right stage!

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Ethyl Mercaptan, a sulfur compound is a clear liquid with a very strong and distinctive smell. Adding it helps us to identify and alert the user about a gas leakage which would otherwise go unnoticed due to the odourless LPG Gas leading to dangerous situations like a fire or explosion.

Ethyl Mercaptan is not only used as an additive to odorless gases like butane, propane, and petroleum to give them a warning odor BUT is also used in the manufacture of fungicides, pharmaceuticals, insecticides, resins, and other chemicals.

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https://youtu.be/E4BGnwEmSjE

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The eggshell is formed by calcium carbonate (CaCO3), a salt in limestone, plaster, marble, chalk, corals, shells of marine animals, stalactites, and stalagmites found in caves, among other places.

On the other hand, Vinegar is composed of an aqueous solution of acetic acid (H₃C-COOH), usually at 4% by volume.

Every carbonate reacts in the presence of acids, generating carbon dioxide (carbon dioxide – CO₂ ). In the case of the egg-in-vinegar experiment, this can be seen by the effervescence (bubbles) that forms around the eggshell.

The following equation can represent the chemical reaction between calcium carbonate and acetic acid:

CaCO₃ (s) + 2CH₃COOH (aq) → Ca(CH₃COO)₂(aq) + H₂CO₃ (aq)
or
CaCO₃(s) + 2CH₃COOH (aq) → Ca(CH₃ COO)₂ (aq) + H₂O (l) + CO₂(g) ↑

Carbonic acid ( H₂CO3), in fact, has never been isolated as such and is considered by many authors as an aqueous solution of carbon dioxide (H₂O + CO₂).

Note that the calcium carbonate that made up the eggshell breaks down, and the membrane around the egg on the inside does not react, becoming elastic.

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Some introductory chemistry texts name solids, liquids, and gases as the three states of matter, but higher level texts recognize plasma as the fourth state of matter. Like a gas, plasma can change its volume and shape, but unlike a gas, it can also change its electrical charge.

Space and time emerged together 13.787±0.020 billion years ago, and the universe has been expanding ever since. While the spatial size of the entire universe is unknown, the cosmic inflation equation indicates that it must have a minimum diameter of 23 trillion light years, and it is possible to measure the size of the observable universe, which is approximately 93 billion light-years in diameter at the present day.

Solids

A solid has a definite shape and volume because the molecules that make up the solid are packed closely together and move slowly. Solids are often crystalline; examples of crystalline solids include table salt, sugar, diamonds, and many other minerals. Solids are sometimes formed when liquids or gases are cooled; ice is an example of a cooled liquid which has become solid. Other examples of solids include wood, metal, and rock at room temperature.

Liquids

A liquid has a definite volume but takes the shape of its container. Examples of liquids include water and oil. Gases may liquefy when they cool, as is the case with water vapor. This occurs as the molecules in the gas slow down and lose energy. Solids may liquefy when they heat up; molten lava is an example of solid rock which has liquefied as a result of intense heat.

Gases

A gas has neither a definite volume nor a definite shape. Some gases can be seen and felt, while others are intangible for human beings. Examples of gases are air, oxygen, and helium. Earth’s atmosphere is made up of gases including nitrogen, oxygen, and carbon dioxide.

Plasma

Plasma has neither a definite volume nor a definite shape. Plasma often is seen in ionized gases, but it is distinct from a gas because it possesses unique properties. Free electrical charges (not bound to atoms or ions) cause the plasma to be electrically conductive. The plasma may be formed by heating and ionizing a gas. Examples of plasma include stars, lightning, fluorescent lights, and neon signs.

Can you Guess the answer to the question , lets find out!

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Milk is a mixture of water, fat, vitamins and minerals. When soap is added to the milk, it helps to separate the water and fat in the milk. When soap is mixed in with the fat and water, the hydrophobic end of the soap molecule breaks up the nonpolar fat molecules, and the hydrophilic end of the soap molecule links up with the polar water molecules. Now that the soap is connecting the fat and water, the nonpolar fat molecules can be carried by the polar water molecules.

As the soap molecules connect to the fat molecules, the molecules of the food coloring get pushed around everywhere resulting in an explosion of color! As the majority of soap molecules attach to the fat molecules and the soap spreads throughout the milk, the color explosion will slow and eventually stop. Add more soap and see if there are more fat molecules that haven’t attached to soap – if there are unattached fat molecules still, the color explosion will begin again.

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