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Posted by Ishmeet Kaur 3 years, 10 months ago
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Vishal Chaudhary 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
Postulates of Dalton’s Atomic Theory
- All matter is made up of tiny, indivisible particles called atoms.
- All atoms of a specific element are identical in mass, size, and other properties. However, atoms of different element exhibit different properties and vary in mass and size.
- Atoms can neither be created nor destroyed. Furthermore, atoms cannot be divided into smaller particles.
- Atoms of different elements can combine with each other in fixed whole-number ratios in order to form compounds.
- Atoms can be rearranged, combined, or separated in chemical reactions.
Posted by Prince ..... 3 years, 10 months ago
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Sanjay Kumar 3 years, 10 months ago
Vishal Chaudhary 3 years, 10 months ago
Shailee Mathpal 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
The law of conservation of mass states that “The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”.
Posted by Damini Damini 3 years, 10 months ago
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Shailee Mathpal 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
Step farming or terrace farming is common in hills to check soil erosion through water current on the slopes. It provides a physical barrier to soil erosion by water. The mountain is made into steps that slows down the speed of rainwater preventing damage to crops.
Posted by Damini Damini 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
- Addition of hot water.
- Addition of poisonous (mercury) compounds in water.
- Blockage of gills of fishes with any pollutant.
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Posted by Mahima Tiwari 3 years, 10 months ago
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Sanjay Kumar 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
The number of units in one mole of any substance is called Avogadro’s number or Avogadro’s constant. It is equal to 6.022140857×1023. The units may be electrons, ions, atoms, or molecules, depending on the character of the reaction and the nature of the substance.
So, if you wanted to know the number of particles in 3 moles of a substance, the value would be:
= 3 x 6.023 x 1023
= 1.81 x 1024 particles
Posted by Aryan Singh 3 years, 10 months ago
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Yerrabolu Chakradhar 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
power=Work/time now Work=Force x distance so power= Force x distance/time
but distance/time= velocity so P=FV
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Posted by Kalash Tulsi Pareek 3 years, 10 months ago
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Queen 14 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
mass, m = 10 kg
Weight, W = m x g = 10 x 9.8 = 98 N ... (g is acceleration due to gravity)
Aadesh Kumar 3 years, 10 months ago
Posted by Pradisha Gavara 3 years, 10 months ago
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Khusi Nayak 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
Structure of cell
Cells are made up of components called cell organelles.
A cell is capable to live and perform all their respective functions due to the presence of cell organelles.
All cells have the same organelles irrespective of their function and organism they are found in i.e. let it be a bone cell or a nerve cell or any other cell, all will have components.
The parts of cell are as follows:
- Cell wall
- Plasma membrane or cell membrane
- Nucleus
- Cytoplasm
- Endoplasmic Reticulum
- Golgi Apparatus
- Lysosomes
- Mitochondria
- Plastids
- Vacuole
Kushagra Kansal 3 years, 10 months ago
Posted by Himanshu Ahlawat 3 years, 10 months ago
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Posted by Vipin Kumar 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Pure substance is one that does not have any other substance or impurity present in it and cannot be separated into other kinds of matter by physical processes. It can be an element or a compound.
- Out of the given nine compounds following are the pure substances
Ice, iron, hydrochloric acid, calcium oxide, mercury are pure substances as they have definite composition. - Milk is a colloid and acts as a heterogeneous mixture hence is not a pure substance.
- Brick and air are made up of more than one substance hence they also don’t fall in the category of pure substances.
Posted by Amith Kumar Acharya 3 years, 10 months ago
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Gaurav Seth 3 years, 10 months ago
Laws of conservation of mass
The law states that mass can neither be created nor destroyed in a chemical reaction i.e. Total masses of reactants is equal to the sum of masses of products and the masses of unreacted reactants. For instance, the reaction of carbon with oxygen to produce carbon-dioxide involves conservation of mass in the following way.
C (12g) + O2 (32g) = CO2 (44g)
Here we used 12 g of carbon and 32 g of oxygen. After reaction the amount of carbon –dioxide produced will be 44g i.e. the sum total of the amount of carbon and oxygen used.
Posted by Ekta Sharma 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Ultrasounds are high frequency waves, which can travel in defined paths even in the presence of many obstacles.
- Ultrasonic waves are used to capture the images of the heart and its features and problems associated with the heart, if any (for treatment purpose). This is called echocardiography.
- Ultrasound scans/Ultrasonography are very commonly used to get images of internal body organs such as liver, kidney, uterus. It helps the doctor to diagnose and treat problems in the body of the patient. In this method, ultrasound waves are made to travel through the body to the organ under consideration. They get reflected and these are converted to electrical signals which can be monitored on a screen.
- Ultrasonography is used to observe the growth of the fetus inside the uterus. It can also used to monitor the abnormalities.
- It is used to break kidney stones into fine grains which later get flushed out through urine.
Posted by Mayal Mit Lepcha 3 years, 10 months ago
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Мυѕкαи ? 3 years, 10 months ago
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Besides these, there are several other water-borne diseases, such as, Jaundice, Viral Gastroenteritis, Polio, Dengue, etc. that can be prevented by consuming everything clean and healthy.
Posted by Siddharth Maurya 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
The protozoan which causes malaria is called Plasmodium. There are four species of protozoan that causes malaria:
- P falciparum
- P vivax
- P ovale
- P malariae
The transmission of the malaria parasite is carried out by female Anopheles mosquitoes which bite usually during the dusk and dawn.
Posted by Neha Sathish 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Method:
1.Take a thin strip of filter paper.
2.Draw a line on it using a pencil approx. 3 cm above the lower edge.
3.Put a small drop of ink with help of a pen at centre of line and let it dry.
4.Lower the filter paper into a glass jar containing water in such a way that the ink's drop remains just above the water level. Leave it undisturbed.
5.Water rises up in the filter paper. Ink drop splits up into its constituents.
Conclusion:Dye in black ink is a mixture of 2 or 3 colours. The coloured component that is more soluble in water rises faster and in this way the colours get separated.
Posted by Anju Mall 3 years, 10 months ago
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Posted by Anku Kumari 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
The factor that the kinetic energy of an object will depend on its direction of motion depends on its speed. This is because kinetic energy is described by its magnitude or velocity.
Posted by Tanushree Prabhu 3 years, 10 months ago
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Clouds form when the invisible water vapor in the air condenses into visible water droplets or ice crystals. For this to happen, the parcel of air must be saturated, i.e. unable to hold all the water it contains in vapor form, so it starts to condense into a liquid or solid form. Water evaporates from water bodies and rises up in the air. ... Cooling causes condensation of water vapour, which leads to the formation of tiny droplets. Tiny droplets grow bigger and heavy by more condensation which ultimately leads to the formation of clouds.
Posted by Ashish Bhabor 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
| Striated muscle |
Unstriated muscle |
Cardiac muscle |
|
They are cylindrical in shape and multi nucleate. |
They spindle shaped and uninucleate. |
They are cylindrical branched and uninucleate. |
|
They are present in body parts such as hands and legs. |
They are present in the wall of food canal, stomach, mouth, iris etc. |
They are present in the heart. |
Posted by Anil Borakh 3 years, 10 months ago
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Posted by ❄❄Harshita Bohet❄❄ 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Our strongest muscle is the masseter, which closes the jaw to chew. When chewing, the force can be upwards of 170 pounds on each molar (“The Power of the Human Jaw,” Scientific American).
Posted by Jahnavi Agarwal 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Thomson’s Atomic Model- Postulates
- According to the postulates of Thomson’s atomic model, an atom resembles a sphere of positive charge with electrons (negatively charged particles) present inside the sphere.
- The positive and negative charge is equal in magnitude and therefore an atom has no charge as a whole and is electrically neutral.
- Thomson’s atomic model resembles a spherical plum pudding as well as a watermelon. It resembles a plum pudding because the electrons in the model look like the dry fruits embedded in a sphere of positive charge just like a spherical plum pudding. The model has also been compared to a watermelon because the red edible part of a watermelon was compared to the sphere having a positive charge and the black seeds filling the watermelon looked similar to the electrons inside the sphere.
Limitations of Thomson’s Atomic Model
- Thomson’s atomic model failed to explain how the positive charge holds on the electrons inside the atom. It also failed to explain an atom’s stability.
- The theory did not mention anything about the nucleus of an atom.
- It was unable to explain the scattering experiment of Rutherford.
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Prachi - 3 years, 10 months ago
Posted by Niranjana E 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
First five elements in the Modern Periodic Table are : Hydrogen, Helium, Lithium, Beryllium and Boron.
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V.Keerthana V 3 years, 10 months ago
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