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Royal Girl 7 years, 11 months ago
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Shanaya Singh 7 years, 11 months ago
Aryan Sharma 7 years, 11 months ago
Amar Kumar 7 years, 11 months ago
Acid is a substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals, a corrosive or sour-tasting liquid ,a molecule or other species which can donate a proton or accept an electron pair in reactions, having a pH of less than 7.
Posted by Mansi Bharti 7 years, 11 months ago
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Royal Girl 7 years, 11 months ago
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Amar Kumar 7 years, 11 months ago
Conductors of heat-,aluminum, iron and copper.
Insulators- plastic and wood.
Posted by Dhruvi Modha 7 years, 11 months ago
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Amar Kumar 7 years, 11 months ago
|
|
Acid |
Base |
|
Arrhenius Definition |
An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water. |
A base is an aqueous substance that can accept hydrogen ions. |
|
Bronstead Lowry Definition |
An acid is an substance which donates a proton. |
A base is any substance which accepts a proton. |
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pH value |
Less than 7.0 |
Greater than 7.0 |
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Litmus paper |
Blue litmus paper turns red |
red litmus paper turns blue |
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Phenolphthalein |
Remains colorless |
Makes the solution pink |
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Dissociation (in water) |
Acids free hydrogen ions (H+) when mixed with water. |
Bases free hydroxide ions (OH-) when mixed with water. |
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Chemical Formula |
An acid has a chemical formula with H at the beginning of it. For example, HCl (Hydrochloric Acid). There is one exception to his rule, CH3COOH = Acetic Acid (vinegar). |
A base has a chemical formula with OH at the end of it. For example, NaOH (Sodium Hydroxide). |
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Amar Kumar 7 years, 11 months ago
A chemical change is a change as the result of a chemical reaction. During a chemical reaction the atoms within a substance are rearranged into different combinations.
For example, sugar undergoes a chemical change when it is cooked to make caramel. The heat from the cooking converts sugar molecules into different molecules that give caramel its color and flavor.
Posted by Aman Aman 7 years, 11 months ago
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Amar Kumar 7 years, 11 months ago
litmus :It is a dye obtained from certain lichens that is red under acid conditions and blue under alkaline conditions.
Litmus paper is paper that has been treated with a specific indicator - a mixture of 10-15 natural dyes obtained from lichens (mainly Roccella tinctoria) that turns red in response to acidic conditions (pH =7).
Sangithkannan Kannan 7 years, 11 months ago
It is a indicator used identify the type of a substance whether acid,base or neutral
Posted by Kajal Rai 7 years, 11 months ago
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Amar Kumar 7 years, 11 months ago
The process of photosynthesis is unique in following ways:-
1. Photosynthesis converts inorganic raw materials into food, that provides our ecosystem with energy.
2. Green plants provide organic food to all the animals and humans.
3. Rare fossil fuels like coal, petroleum and natural gas are formed through the degradation of the past plant and animal parts, which were originally formed by photosynthesis.
4. Plant products like timber, rubber, herbs, medicines resin and oils are derived from photosynthesis.
5. Photosynthesis helps in providing oxygen in the atmosphere required by all living organisms.
6. Photosynthesis decreases the concentration of carbon dioxide and other harmful industrial wastes that lead to respiration problems in living beings.
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