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Yogita Ingle 5 years, 1 month ago
A solution is a homogeneous mixture of two or more substances. A solution has a solvent and a solute as its components. The component of the solution that dissolves the other component in it (usually the component present in larger amount) is called the solvent. The component of the solution that is dissolved in the solvent (usually present in lesser quantity) is called the solute.
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Cations are positively charged ions. They are formed when a metal loses its electrons. They lose one or more than one electron and do not lose any protons. Therefore they possess a net positive charge. Some examples of cations are Calcium (Ca2+), Potassium (K+), hydrogen (H+).
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Insha Fatima 5 years, 1 month ago
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The basic structure of cell consist of nucleus, plasma membrane and cytoplasm. Other than this different structures like Endoplasmic Reticulum(ER), Golgi body, Lysosomes, Mitochondria, Plastids and Vacuoles are also present. All of these are cell organelles. Presence of different cell organelles differ from organism to organism i.e. unicellular or multicellular organism. Cell organelle can be either membrane bound or can lack membrane.
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The physical quantity that has both direction as well as magnitude.
Force is vector quantity because its has direction as well as magnitude.
Posted by Akshat Dadhich 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
The physical quantity that has both direction as well as magnitude.
Vector quantity examples are many, some of them are given below:
- Linear momentum
- Acceleration
- Displacement
- Momentum
- Angular velocity
- Force
- Electric field
- Polarization
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- A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.
- For Example: - Soap solution, Milk, Ink, Blood and solutions of synthetic detergents.
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The commercial unit of electrical energy is a kilowatt-hour (kWh).
To convert 1kWh into joule
1kWh = 1000 × 60 × 60
1kWh = 3.6 × 106 J
The electric energy used in factories, industries and houses which are measured in kWh.
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Ammonium chloride changes directly from solid gaseous on heating . So to separate mixtures containing a sublimable volatile component from a non-sublimable impurity i.e., sodium chloride, the sublimation process is used.
• Place the china dish over a wire gauze placed over a tripod stand.
• Cover the china dish with an inverted glass funnel and plug in a little cotton at the opening stem.
• On heating the mixture, white fumes evolve.
• Stop heating when the fumes stop rising and allow the funnel to cool.
• On cooling, remove the funnel and transfer the solid ammonium chloride sticking on the walls of funnel to a watch glass.
Posted by Nandini Sharma 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Mitochondria are round "tube-like" organelles that provide energy to a cell in the form of ATP (Adenosine Triphosphate) for performing different chemical activities for the sustainance of life.
The mitochondria is also called powerhouse of the cell.
Posted by Jeevitha R 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
Consider the velocity-time graph of an object that moves under uniform acceleration as shown in the figure 
From this graph, we can see that initial velocity of the object (at point A) is u and then it increases to v (at point B) in time t. The velocity changes at a uniform rate a. As shown in the figure, the lines BC and BE are drawn from point B on the time and the velocity axes respectively, so that the initial velocity is represented by OA, the final velocity is represented by BC and the time interval t is represented by OC. BD = BC - CD, represents the change in velocity in time interval t.
Posted by Ishwar Vats 5 years, 1 month ago
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Meghna Thapar 5 years, 1 month ago
Atoms having the same atomic mass and different atomic numbers are known as isobars. Ce and Se are isobars having the same atomic mass 76. They have different atomic numbers, i.e., Ce has an atomic number of 32 and Se has an atomic number of 34. Isobars are the atoms of different elements having same atomic mass but a different atomic number. They have the same number of nucleons (protons + neutrons).
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A) at 25 degree Celsius water is starting to become boiling
b) at 0°c water freezes
c) at 100°c water starts. to vaporising ..
Posted by Divya Gupta 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Acetone, petrol, perfume etc., being volatile, evaporate very fast when exposed to larger surfaces. When we put some acetone or petrol or perfume on our palm, it evaporates. During evaporation, particles of the liquid absorb energy from the surface of the palm to compensate for the loss of energy, making the surroundings cool. Hence, our palm feels cold when we put some acetone or petrol or perfume on it.
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Yogita Ingle 5 years, 1 month ago
The sound waves are called mechanical waves because they need a material medium( like solid, liquid or gas ) for their propagation. The sound wave involve the vibrations of the particles of the medium through which they travel .
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