CBSE > Class 10 > Science | CBSE Board | Homework Help

When we burn a paper it turns to ash and we cant get it again to paper by this we can say that we will get a new substance but we cant get its original form again

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Miss__ Thakur 5 years, 7 months ago

Chemical change is a change in its chemical form....in which new substance is formed....eq. burning of paper, burning of wax..etc.....HOPE THIS WILL HELP YOU ??

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Gaurav Kumar 5 years, 7 months ago

Chemical change is a change in which a new substance get formed

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What is refraction?.

Posted by Amrita Mishra 5 years, 7 months ago

CBSE > Class 10 > Science

3 answers

Shreya Wakhare 5 years, 6 months ago

The change in direction of light when it passes from one median to another.

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Miss__ Thakur 5 years, 7 months ago

In easy words, Refraction is the bending of light when it travels From one medium to other...... HOPE THIS WILL HELP YOU ????

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Yogita Ingle 5 years, 7 months ago

Refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.
Refraction of light is one of the most usually observed phenomena which includes refraction of light through prism, but other waves like sound waves and water waves also experience refraction.

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Which forces are helpful in movement of water upwards in xylem tissue.???

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Upward movement of water through xylem is best explained by cohesion theory. It states that cohesion pull is responsible for movement of water in the xylem. The force of cohesion tension exceeds root pressure on a sunny day because on a sunny day the rate of transpiration is high. The water is lost from guard cell which leads to decrease in the water potential of guard cell as compared to the surrounding cell. To stabilize the water potential in the guard cell water rushes from the neighboring cell which creates a cohesion pull in the xylem vessels to pull the water up to the guard cell.

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When carbon dioxide is passed into limewater,the limewater turn milky.why?

Posted by Bharat Sharma Scientist 5 years, 7 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 7 months ago

When CO₂ passes through lime water, it turns into milky lime water due to formation of insoluble calcium carbonate.
Ca(OH)₂ + CO₂⇌CaCO₃₍+) + H₂O
IOf CO2 is passed for longer period, turbidity disappears due to form of soluble calcium bicarbonate.
CaCO₃ + H₂O+ CO₂ ⇌ Ca(HCO₃)₂ .

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? Ishika ?? 5 years, 7 months ago

When carbon dioxide is passed through lime water, it turns lime water due to formation of white precipitate of calcium carbonate.

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How many milliamperes are there in 1 ampere?

Posted by Mayank Baghel 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Aditya Upadhyay 5 years, 7 months ago

1000milliamperes

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By what name is the physical quantity coulomb /second called

Posted by Mayank Baghel 5 years, 7 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 7 months ago

The physical quantity coulomb/second called Ampere.

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Aditya Upadhyay 5 years, 7 months ago

Current

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Compare how an ammeter and a voltmeter are connected in a circuit?

Posted by Mayank Baghel 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

? Ishika ?? 5 years, 7 months ago

?AMMETER- it is always connected in series in a circuit through which the current is to measure. ?VOLTMETER- it is connected in parallel across the points between which the potential difference is to measure.

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Which of the following unit could be used to measure electric charge?

Posted by Mayank Baghel 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Aditya Upadhyay 5 years, 7 months ago

Coloumb(C) is the unit of electric charge

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Function of Adrenaline

Posted by Anushka ???? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Lucifer??Morningstar?? . 5 years, 7 months ago

Functions of adrenaline include increasing the heart rate, increasing blood pressure, expanding the air passages of the lungs, enlarging the pupil in the eye (see photo), redistributing blood to the muscles and altering the body's metabolism, so as to maximise blood glucose levels (primarily for the brain).

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Use of Bile juice and bile salt

Posted by Suryansh Singh 5 years, 7 months ago

CBSE > Class 10 > Science

2 answers

Shreya Wakhare 5 years, 6 months ago

Most important part of digestive system.

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Riya Shankar 5 years, 7 months ago

It help us to digest our food

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ANSWER

Explain the syatem of digestion of food in our body.??

Posted by Anushka ???? 5 years, 7 months ago

CBSE > Class 10 > Science

3 answers

Lucifer??Morningstar?? . 5 years, 7 months ago

I am also fine, but mn nhi lg rha

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Anushka ???? 5 years, 7 months ago

Thank u for the ans and i m fine uu

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Lucifer??Morningstar?? . 5 years, 7 months ago

Digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.

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ANSWER

How many chromosomes do we have??

Posted by Anushka ???? 5 years, 7 months ago

CBSE > Class 10 > Science

5 answers

Aayush Singh 5 years, 7 months ago

1 is *** chromosome and others are autosome

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Sandli Thakur✍?✍?(Helping Hand)? 5 years, 7 months ago

46 chromosomes

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Suryansh Singh 5 years, 7 months ago

Yeah actually it's 23 pairs means 46 but 22 pair are autosomes present in both male and female but last one 23rd one is *** chromosome so need for doubt!

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Anushka ???? 5 years, 7 months ago

I think soo.. 23 are there i am confused ??

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Suryansh Singh 5 years, 7 months ago

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Which food have acid

Posted by Syed Irfan 5 years, 7 months ago

CBSE > Class 10 > Science

2 answers

Shreya Wakhare 5 years, 6 months ago

Sour in taste, turns blue litmus red,H+equation.

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Sandli Thakur✍?✍?(Helping Hand)? 5 years, 7 months ago

Which are sour ......

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Define Adition reacion

Posted by Pappal Panipat 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

Combination Reaction: When two or more substances combine to form a single product, the reaction is known as a combination reaction. This reaction is also called addition reaction.

For example: In the laboratory, iron sulphide is prepared by mixing iron and sulphur.

Fe(s) +S(s) - FeS(s)
2Mg (s) + O2 - 2MgO (s)

Magnesium + Oxygen - Magnesium Oxide

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What is combustion with example

Posted by Pappal Panipat 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames.

In a complete combustion reaction, a compound reacts with an oxidizing element, such as oxygen and the products are compounds of each element in the fuel with the oxidizing element.
For example: CH₄+ 2O₂ → CO₂ + 2H₂O

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Site of pyruvate firmation in a cell???? ????

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Suryansh Singh 5 years, 7 months ago

Just remember that glucose C6H12O6 breaks down in 3 carbon atoms in cytoplasm

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what happens when CO2 is passed through slaked lime?

Posted by Arjun Kalbi 5 years, 7 months ago

CBSE > Class 10 > Science

2 answers

Suryansh Singh 5 years, 7 months ago

Perfect answer!!!

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Yogita Ingle 5 years, 7 months ago

When CO₂ is passed through lime water for a short duration, it turns lime water milky due to the formation of a white precipitate of calcium carbonate.
Ca(OH) + CO₂ → CaCO₃ + H₂O
When CO₂ is passed through lime water for a long time, then white precipitate of calcium carbonate which was formed initially dissolves due to the formation of soluble calcium hydrogen carbonate and solution becomes clear again.
CO₂ + CaCO₃+ H₂O → Ca(HCO₃)₂

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What is the function of pancreatic juice????????????

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Pancreatic juice secreted from pancreas contains enzymes like trypsin and helps in the process of digestion of proteins and lipase for fats.

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What is the symbol of calcium

Posted by Paramjeet Saini 5 years, 7 months ago

CBSE > Class 10 > Science

4 answers

G Siri 5 years, 6 months ago

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Syed Irfan 5 years, 7 months ago

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? Ishika ?? 5 years, 7 months ago

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Apurv Sharma 5 years, 7 months ago

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Why is double circulation of blood necessary in human being??

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science

1 answers

Kushagra Rai 5 years, 7 months ago

Double Circulation is necessary in human being to separate oxygenated and de-oxygenated blood because this makes the circulatory system more efficient and helps in maintaining a constant body temperature. This phenomena usually happens just in MAMMALS.

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Can anyone tell me... What it meant by fat emulsification??????

Posted by ? Ishika ?? 5 years, 7 months ago

CBSE > Class 10 > Science