Al + moist = Al2O3 Which prevent it from further corrosion

Aluminium metal forms a thin layer of aluminium oxide all over its surface under the action of moist air. This layer prevents the metal underneath from further corrosion. It is cheap, easily available, malleable and ductile. Therefore, it is used to make utensils for cooking.

Mercury is a heavy, silvery-white liquid metal. Compared to other metals, it is a poor conductor of heat. Even if it is a poor conductor of heat, It's used in thermometers because it has high coefficient of expansion. ... It has a shiny surface and doesn't get stick to the glass surface of the thermometer.

Electrolytic refining is a technique that is used for the extraction and purification of metals that are obtained by refining methods. The impure metal is used as an anode and the pure metal is used a cathode. Soluble salt from the same metal is used an electrolyte. Electrolytic refining is the process of refining impure metals by using electricity. ... A solution of a soluble salt of the same metal is taken as the electrolyte. Example- Copper can be purified by this way. In electrolytic refining of copper, the electrolyte is a solution of acidified copper sulphate.

The most widely used method for refining impure metals is electrolytic refining.

Electrolytic  refining  means  refining  by  electrolysis.  Metals  such  as  copper,  zinc,  tin,  lead,  chromium, nickel, silver and gold are refined electrolytically.

 

• For refining an impure metal by electrolysis:

A thick block of impure metal is made the anode. A thin strip of pure metal is taken as the cathode. A water soluble salt is taken as the electrolyte. On  passing  current  through  the  electrolyte,  the  impure  metal  from  the  anode  dissolves into  the electrolyte. An equivalent amount of pure metal from the electrolyte is deposited on the cathode. The  soluble  impurities  go  into  the  solution,  whereas  the  insoluble  impurities  settle  down  at  the bottom of the anode and are known as the ‘anode mud’.

Extraction of copper metal:

In an electrolytic tank, acidified copper sulphate (CuSO4 + dilute H2O4) solution forms the electrolyte. A block of impure copper is made into an anode by connecting the positive terminal of a power supply (battery). A thin strip of highly pure copper metal is the cathode of the cell. The negative terminal of the power supply is connected to it.

A small electric current is passed through the cell. Atoms from the anode enter the electrolyte. The copper from the anode gets converted into copper sulphide. An equal number of copper atoms from the solution get deposited on the cathode. This is to keep the concentration of the solution constant. Impurities from the anode block either remain in solution or collect below the anode, as they are unable to displace copper form the sulphate solution. The impurities remain insoluble in the electrolyte and they are called anode mud.

Copper sulphate solution contains ions of Cu++ and SO4--. The following reactions take place at the anode and cathode when an electric current is passed.

Both male and female parent contributes equally to the DNA of the progeny during sexual reproduction. When the germ cells combine, they will restore the normal number of chromosomes in the progeny, ensuring the stability of the DNA of the species. DNA is the genetic material and it is responsible for the transmission of characters from parents to the offsprings. Even the *** of the individual is determined genetically in humans.

Balanced equation means the atoms on both the reactants and product side are equal. Balancing equations means that we need to balance it because atoms of reactants and products are not equal Hope you understand

Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element. A wide range of power switching transistors are also available, with current rating up to several hundred amperes and voltage ratings well over 1000V. To test a fuse without multimeter, take a flashlight equipped with a flat battery. Unscrew the bulb and get the battery. Place the fuse of one of the battery “blades” and the base of the bulb on the other side of the fuse. Put the bulb pad in contact with the second “blade” of the battery.

Hydrochloric acid plays a major role in the process of digestion. It creates a medium of gastric juice acidic so that the enzyme pepsin digests the protein and kills the bacteria present in them. Hydrochloric acid helps your body to break down, digest, and absorb nutrients such as protein. The hydrochloric acid found in the stomach facilitates the process of digestion by disintegrating complex large food molecules into simpler molecules. The acid activates the pepsinogen enzyme required to digest proteins.

When there is no hydrochloric acid in the stomach, the iron absorption process is hindered as iron is essential in the solution for absorption. The stomach is prompted to produce acid when food is consumed for the production of the gastrin hormone. Hence, the acid lowers the pH level in the stomach, switching off the gastrin production which otherwise would lead to hypergastrinemia.

The chemical reaction involved in the electrolysis of water is

 

From the above reaction it is clear that the amount of hydrogen gas and the oxygen gas formed are always in the ratio of 2:1. Therefore the volume of gas collected in the first test tube is double the volume of the gas collected in second test tube.

Since pressure in the veins is normally relatively low, for blood to flow back into the heart, the pressure in the atria during atrial diastole must be even lower.So this means that veins have blood pressure.

 

Blood flows in the same direction as the decreasing pressure gradient: arteries to capillaries to veins. ... As vessel diameter decreases, the resistance increases and blood flow decreases. Very little pressure remains by the time blood leaves the capillaries and enters the venules.

Lateral Displacement is the perpendicular distance between the emergent ray from a glass slab and the incident ray produced forward.

When the perpendicular distance between the original path traced by an incident ray and the path traced by the emergent ray coming out from the glass slab is known as lateral displacement.

Following are the factors on which lateral displacement depends:

• The thickness of the glass slab
• Refractive index of the glass slab
• The angle at which incident ray enters the glass slab

Give me answer

Decomposition reaction because the food entre our body and they breakdown in many differeny substance. In different parts of body

Decomposition Reaction

 

• Digestion of food in our body is a decomposition reaction.
• Decomposition reaction is a type of chemical reaction in which single compound splits into two or more simple substances.
• In digestion of food carbohdratess, proteins, fats dcomposes to simple substaces that provide energy to do work.

When any acid higher h+ ions so it is strong acid When any base have higher OH- ions so it is strong base

A strong base is a base that is 100% ionized in solution. If it is less than 100% ionized in solution, it is a weak base. 

Lower the ph is strong acid .higher the ph is weak acid

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<font face="Bookman Old Style, serif">In Decomposition reaction a single substance decomposes to form two or more substances which is exact opposite of Combination reaction in which two or more reactants combine to form a single product that is why decomposition reactions called the opposite of combination reactions. For examples
Decomposition reaction:</font>

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<font face="Bookman Old Style, serif">Combination Reaction:</font>

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Yes

The flow of electric current or charge is known as electricity

Electricity is the flow of electrical power or charge

In cell biology granule is small particle

Yes

The capacity to do work is termed as Energy. The Energy expended to do work in unit time is termed as Power. It is represented as P.
Power Formula is articulated as,

P= E/t

P = W/t

or,

Where,
The Energy Consumed to do work = E
Work done = W 
Time taken= t 

Formula=work/ time=displacement/time= force.displacement/time Power=velocity.force????

The amount of energy transfer or converted per unit time. Formula=work/time

1) Arteries carry blood away from heart and veins bring blood toward heart 2) Arteries contain oxygenated blood but veins contain deoxygenated blood

Arteries	Veins
Carry blood away from the heart	Carry blood towards the heart
Carry oxygenated blood	Carry deoxygenated blood
Red in colour due to oxygenated blood	Blue in colour due to deoxygenated blood
Located deep in the body	Located close to the skin

The plants do not have a nervous system and sense organs like ear ,nose ,mouth,etc like the animals , but they can still sense things. The plants coordinate their behavior against environmental changes by using hormones. The functions of control and coordination in plants is performed by certain chemical substances.These chemical substances are called plant hormones or phytohormones. There are four major types of plant hormones [phytohormones] . which are involved in the control and coordination  in plants.These are : 1)Auxins 2)Gibberellins 3)Cutokinins 4)Abcisic acid 1)Auxins are the plant hormones which promote cell enlargement and cell differentiation. Auxins also promote fruit growth. Auxin hormone is responsible for phototropic and geotropic responses of plants. 2) Gibberellins are plant hormones which promote cell enlargement and cell differentiation in the presence of auxins. Gibberellins help in breaking the dormancy in seeds and buds. They  also promote fruit growth. Gibberellins stimulates elongation of shoots of various plants 3) Cytokinins are plant hormones which promote cell division in plants.They also help in breaking the dormancy in seeds and buds. The delay the ageing of leaves.Cytokinins promote opening of stomata . 4)Abscisic acid (ABA) is a  plant hormone which functions mainly as a growth inhibitor. Abscisic acid promotes the dormancy in seeds and buds [ this is the opposite of breaking the dormancy]. It also promotes closing of stomata. Abscisic acid promotes falling of leaves.

Plants need sunlight, water, oxygen, minerals for their growth and development. These are external factors. Apart from these, there are some intrinsic factors that regulate the growth and development of plants. These are called plant hormones or “Phytohormones”.

The various functions performed by the plant hormones are:

1. Auxins promote cell enlargement and cell differentiadon. They also promote growth.
2. Gibberellins promote cell enlargement and cell differentiation in the presence of auxin. It also help in breaking the dormancy in seeds and buds. It promote the growth in fruits.
3. Cytokinins promote cell division and help in breaking the dormancy of seeds and buds. It delay the ageing in leaves. It promotes the opening of stomata and also fruit growth.
4. Abscisic acid promotes the dormancy in seeds and buds. It promotes the closing of stomata and falling of leaves. Inhibits growth, reverses the growth promoting effects of auxins and gibberellins. Its effects include wilting of leaves.
5. Ethylene promotes the falling of leaves, ripening of fruits and helps in breaking bud dormancy.

The conditions required to obtain permanent electromagnet when a current carrying solenoid is used are: The rod inside solenoid should be made of a magnetic material like steel, soft iron etc. This type of material can retain the magnetic properties for a long time after magnetization.

Bisexual flower	Unisexual flower
1. It is also known as complete flower.	1. It is also known as incomplete flower.
2. It contains both male and female reproductive system.	2. It contains either male or female reproductive system.
3. E.g. Hibiscus	3. E.g. Palm

Brine is solution of salt Mainly sodium chloride NaCl

Brine is a solution of table salt in water

Solution of NaCl

In an experiment of magnetism, the iron fillings are collected more in the north pole and the south pole of the magnet.

North pole and south pole collected more in the iron filling

No it is oestrogen

Early in puberty, levels of luteinizing hormone and follicle-stimulating hormone increase, stimulating the production of *** hormones. The increased levels of *** hormones (primarily estrogen) result in physical changes, including maturation of the breasts, ovaries, uterus, and ******. The trigger for puberty in both boys and girls is the production of 'gonadotrophin releasing hormone' (GnRH) from a part of the brain called the hypothalamus. This hormone stimulates the pituitary gland to release two hormones, Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH).