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Ask QuestionPosted by Afreen Dudekula 7 years, 3 months ago
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Posted by Jatin Singla 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Atomic mass of argon (Ar) = 39.948
Atomic number of argon (Ar) = 18
Posted by Priyanka Bad 7 years, 3 months ago
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Gaurav Seth 7 years, 3 months ago
- Chlorofluorocarbons (Cfc's) are responsible for depletion of ozone layer.
- Chloro fluoro carbons ( CFC's) are mainly emitted from refrigerators and Air conditioners which are mainly responsible fir depletion of ozone layer (O3).
Posted by Sumit Gupta 7 years, 3 months ago
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Simran Kaur 7 years, 3 months ago
Yogita Ingle 7 years, 3 months ago
1. They are typically sausage shaped or cylindrical shaped.
2. Each mitochondrion is a double membrane - bound structure with the outer membrane and the inner membrane dividing its lumen distinctly into two compartments, I.e., the outer compartment (perimitochindrial space) and the inner compartment matrix).
3. They are present in almost all the cells of the body except in Red Blood Cells.
4. They are freely floating in the cytoplasm and and stay in the regions of high energy requirement.
5. Mitochondria are self replicable i.e. they can multiply on their own without the requirement of cell to divide.
6. Mitochondria have their own genetic material as single stranded DNA.
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Yogita Ingle 7 years, 3 months ago
Ebola Virus Disease (EVD) is a rare and deadly disease most commonly affecting people and nonhuman primates (monkeys, gorillas, and chimpanzees). It is caused by an infection with a group of viruses within the genus Ebolavirus. Ebola virus was first discovered in 1976 near the Ebola River in what is now the Democratic Republic of Congo.
Posted by Simran Sarao 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Energy is the ability to perform work. Energy can neither be created nor destroyed. It can only be transformed from one kind to another. The unit of Energy is same as of Work i.e. Joules.
Heat is the form of energy that is transferred between two substances at different temperatures. The direction of energy flow is from the substance of higher temperature to the substance of lower temperature. Heat is measured in units of energy, usually calories or joules.
Posted by Karan Singh 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Polyatomic ion, also known as a molecular ion, is a charged species (ion) composed of two or more atoms covalently bonded or of a metal complex that can be considered as acting as a single unit in the context of acid and base chemistry or in the formation of salts.
Example, a hydroxide ion is made of one oxygen atom and one hydrogen atom: its chemical formula is (OH)−. It has a charge of −1. An ammonium ion is made up of one nitrogen atom and four hydrogen atoms: its chemical formula is (NH4)+. It has charge of +1.
Posted by Undertaker T 7 years, 3 months ago
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Palak ?? 7 years, 3 months ago
Sagar Rana 7 years, 3 months ago
Yogita Ingle 7 years, 3 months ago
Bilateral symmetry is the symmetry in which an organism is exactly divided into right and left halves by a single line of symmetry. e.g. Butterfly. The organisms which exhibit this type of symmetry are called as bilaterally symmetrical organisms.
Karan Singh 7 years, 3 months ago
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Posted by Aditya Bhandari 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
1. Fish float based on Archimedes' principle. Most fish have an organ known as the swim bladder. When they want to rise, fish release gas into the swim bladder and increase their volume. As a result, they displace more water. The force of buoyancy acting on them increases. To come down, a fish empties the bladder to the required extent, reducing the volume and the force of buoyancy acting on it.
2. A hot air balloon rises and floats due to the buoyant force (when the surrounding air is greater than its weight). It descends when the balloon's weight is higher than the buoyant force. It becomes stationary when the weight equals the buoyant force.
The weight of the Hot-air balloon can be controlled by varying the quantity of hot air in the balloon.
3. A hydrometer uses Archimedes’ principle to determine the density of any liquid.
Posted by Vedanshi Singh 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Rules followed in writing chemical equations are:
1. A chemical equation should be written with the reactants (if there are two or more should be separated by ‘+’ symbol, same applicable to products) on the left side of an arrow and the products of the chemical reaction on the right side of the equation.
2. The head of the arrow should always points toward the right or toward the product side of the equation (sometimes indicate equilibrium with the reaction proceeding in both directions simultaneously).
3. The condition required for the reaction to proceed (say temperature, pressure, catalyst etc.) should be written on the top of the arrow.
4. The physical state of reactants and product should be informed by writing the state inside the bracket next to the reactants and product. If gas you need to write e.g. O2(g), similarly for liquids (l), solids (s), aqueous solutions (aq) etc.
5. Chemical equations should be balanced on the basis of law of conservation of mass, i.e. number of atoms of the elements on the left side(reactants) should be equal to number of atoms of same elements on right side(products).
An example of a balanced chemical equation following above rules may be seen in the combustion of methane:
heat
CH4 (g) + 2O2(g) -------→ CO2(g) + 2H2O(l)
Reactants(LHS) Products (RHS)
Posted by Ruptisha Mhalsekar 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
The only difference between a molecule of a compound and a molecule of an element is that in a molecule of an element, all the atoms are the same. For example, in a molecule of water (a compound), there is one oxygen atom and two hydrogen atoms. But in a molecule of oxygen (an element), both of the atoms are oxygen.
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Sania Guneja 7 years, 3 months ago
1Thank You