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Posted by Kavita Rajput 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Any substance is said to be pure if and only if it is made up of single type of particles means all the particles of that substance should be of same chemical nature. For example water, sugar, salt, Sodium, Tin etc.
There are two types of pure substances that are Elements and Compounds.
Examples of elements are: Iron, Silver, Gold, Mercury etc.
Examples of compounds are: Water, Carbon dioxide, methane, vinegar etc.
Takshi Shukla 5 years, 6 months ago
Posted by Kavita Rajput 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Mass of solute = 36 g
Mass of solvent = 100g
Mass of solution = 100 + 36
= 136g
Concentration of solution = (Mass of solute / Mass of solution ) x100
= (36/136) x 100
= 26.47%
Posted by Kavita Rajput 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
The rate of evaporation is affected by the following factors:
- Temperature: The rate of evaporation increases with an increase in temperature.
- Surface area: The rate of evaporation increases with an increase in surface area.
- Humidity: The amount of water vapour present in the air is called humidity. The rate of evaporation decreases with an increase in humidity.
- Wind speed: Evaporation increases with an increase in wind speed.
Posted by Yash Kannojiya 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
\huge{\underline{Given:-}}
{tex}{d_1 = 10m ; t_1 = 5 seconds}{/tex}
{tex}{d_2 = 20m ; t_1 = 10 seconds}{/tex}
{tex}{d_1 = 30m ; t_1 = 10 seconds}{/tex}
By the formula of average speed
{tex}average \: speed = \frac{total \: distance \: travelled}{total \: time \: taken}{/tex}
Substituting the values.
{tex}average \: speed = \frac{10 + 20 + 30}{10 + 10 + 5}{/tex}
{tex}average \: speed = \frac{60}{25}{/tex}
{tex}average \: speed = 2.4 \: \frac{m}{s}{/tex}
{tex}\boxed{\boxed{average speed = 2.4 m/sec}}{/tex}
So,the average speed of the particle is 2.4 m/s.
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Suryaveer Singh Chauhan 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
In summer we perspire more; cotton being a good absorber of water helps in absorbing the sweat and exposes it to the atmosphere for evaporation. When sweat evaporates from our body it takes heat from our body. Thus, our body loses heat and gets cooled.
Posted by Chahat Sisodia 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
| Types | Mitosis | Meiosis |
| Interphase | Each chromosome replicates. The result is two genetically identical sister chromatids. | Interphase – Chromosomes not yet visible but DNA has been duplicated or replicated. |
| Prophase | Prophase I – crossing-over recombination – Homologous chromosomes (each consists of two sister chromatids) appear together as pairs. Tetrad is the structure that is formed. Segments of chromosomes are exchanged between non-sister chromatids at crossover points known as chiasmata (= crossing-over). | Prophase –Each of the duplicated chromosomes appears as two identical or equal sister chromatids, The mitotic spindle begins to form. Chromosomes condense and thicken. |
| Metaphase | Metaphase I Chromosomes adjust on the metaphase plate. Chromosomes are still intact and arranged as pairs of homologues. | Metaphase -The chromosomes assemble at the equator at the metaphase plate. |
| Anaphase | Anaphase I Sister chromatids stay intact. But homologous chromosomes drift to the opposite or reverse poles. | Anaphase – The spindle fibres begin to contract. This starts to pull the sister chromatids apart. At the end of anaphase, a complete set of daughter chromosomes is found each pole. |
Posted by Chahat Sisodia 5 years, 6 months ago
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Yogita Ingle 5 years, 6 months ago
Culture fishery: In this kind, fishes are grown in Sea or fresh water.
The fishes are divided by food consumed.
top feeders
middle feeders
bottom feeders
examples: rohu, common mrigals and carps
Posted by Farhan Rayeen 5 years, 6 months ago
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Meghna Thapar 5 years, 5 months ago
"Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs." Therefore, crystallization is used to separate a solid-liquid mixture.
Posted by Aman Kumar 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Reptiles are vertebrates which are either terrestrial or aquatic. They are cold-blooded animals having water-proof skin with scales. Examples - Crocodile, snake, turtle, lizard
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Gaurav Seth 5 years, 6 months ago
| Element | Atomic Number | Valency |
| Valency of Hydrogen | 1 | 1 |
| Valency of Helium | 2 | 0 |
| Valency of Lithium | 3 | 1 |
| Valency of Beryllium | 4 | 2 |
| Valency of Boron | 5 | 3 |
| Valency of Carbon | 6 | 4 |
| Valency of Nitrogen | 7 | 3 |
| Valency of Oxygen | 8 | 2 |
| Valency of Fluorine | 9 | 1 |
| Valency of Neon | 10 | 0 |
| Valency of Sodium (Na) | 11 | 1 |
| Valency of Magnesium (Mg) | 12 | 2 |
| Valency of Aluminium | 13 | 3 |
| Valency of Silicon | 14 | 4 |
| Valency of Phosphorus | 15 | 3 |
| Valency of Sulphur | 16 | 2 |
| Valency of Chlorine | 17 | 1 |
| Valency of Argon | 18 | 0 |
| Valency of Potassium (K) | 19 | 1 |
| Valency of Calcium | 20 | 2 |
| Valency of Scandium | 21 | 3 |
| Valency of Titanium | 22 | 4 |
| Valency of Vanadium | 23 | 5,4 |
| Valency of Chromium | 24 | 2 |
| Valency of Manganese | 25 | 7, 4, 2 |
| Valency of Iron (Fe) | 26 | 2, 3 |
| Valency of Nickel | 27 | 3, 2 |
| Valency of Cobalt | 28 | 2 |
| Valency of Copper (Cu) | 29 | 2, 1 |
| Valency of Zinc | 30 | 2 |
Posted by Aryan Yadav 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
According to Newton's 2nd Law: Force on a body is equal to the product of its mass and the acceleration produced.
F=ma
F∝a
Force is directly proportional to acceleration.
Posted by Ishpinder Dhillon 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
The chemical element with the lowest melting point is Helium and the element with the highest melting point is Carbon.
Posted by Ishpinder Dhillon 5 years, 6 months ago
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Posted by Ishpinder Dhillon 5 years, 6 months ago
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Gaurav Seth 5 years, 6 months ago
| BASIS | Atoms | Molecules |
| Definition | Most fundamental and smallest part that can exist of an element. | Two or more atoms chemically bonded together. |
| Example | Oxygen – O
Sulphur – S |
Oxygen – O2
Sulphur – S8 |
| Structure | Smallest particle with properties of an element. | Combination of two or more atoms. |
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Aniket Sikaria 5 years, 6 months ago
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