Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by ₷Āńïk₳ Dĥãpãtè ₯ 5 years, 4 months ago
- 4 answers
Gulshan Nande Lal 5 years, 4 months ago
₷Āńïk₳ Dĥãpãtè ₯ 5 years, 4 months ago
?Ⓡ?Ďᗴ?? Ү??Ⓐⓥ 5 years, 4 months ago
Posted by Dhanush N 5 years, 4 months ago
- 5 answers
₷Āńïk₳ Dĥãpãtè ₯ 5 years, 4 months ago
Gaurav Seth 5 years, 4 months ago
a n s w e r
- Gallium is a metal that melts when kept on the palm.
- Gallium melts when kept on palm because they have a very low melting point and just the heat in our palm can melt them easily.
Posted by Dipanshu Bedi 5 years, 4 months ago
- 5 answers
Madhiha ??? 5 years, 4 months ago
₷Āńïk₳ Dĥãpãtè ₯ 5 years, 4 months ago
Gaurav Seth 5 years, 4 months ago
a n s w e r :
Chemical reactions - The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is known as Chemical Reaction.
Yogita Ingle 5 years, 4 months ago
Chemical reactions- The transformation of chemical substance into a new chemical substance by making and breaking of bonds between different atoms is known as Chemical Reaction.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 1 answers
Yogita Ingle 5 years, 4 months ago
Resistance of the iron = 20 ohm
Current = 5 ampere
Time = 30 seconds
To Find :-
Heat Produced.
Formula to be used :-
Heat produced = I²RT
Putting all the values, we get
Heat produced = I²RT
Heat produced = 25 × 20 × 30
Heat produced = 15000 Joules.
Hence, the heat produced in 30 seconds is 15000 Joules.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 1 answers
Yogita Ingle 5 years, 4 months ago
P = 1KW = 1000 W
V = 220 V
P = V×I
1000 = 220×I
I = 4.54 A
P = V×(V/R)
P = V^2/R
1000 = (220)^2/R
R = 48.4 ohm
Hence the fuse wire used should withstand the 48.4 A of current.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 1 answers
Gaurav Seth 5 years, 4 months ago
When resistors are connected in parallel, the supply current is equal to the sum of the currents through each resistor. In other words, the currents in the branches of a parallel circuit add up to the supply current.
Also, they have the same potential difference across them. In other words, any components in parallel have the same potential difference across them. And, the total resistance will always be lesser than the least resistance in the circuit.
Put them all in parallel-
(1/R) = (1/(1/5)) + (1/(1/5)) + (1/(1/5)) + (1/(1/5)) + (1/(1/5))
= 5 + 5 + 5 + 5 + 5 = 25
R = 1/25 ohms
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Madhiha ??? 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
Consider P=V2/R here, Power P is inversely proportional to Resistance R. which implies that-
For any constant Potential difference
- When power is high, resistance will be low.
- When power is low, the resistance will be high.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 4 answers
Ramadevi.K? K 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra resistance in the path of free electron. Hence resistance increases with increase in the temperature.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Yogita Ingle 5 years, 4 months ago
Electric power in terms of current = IR2 and in terms of voltage = V2/R and in terms of voltage and current both = VI
Posted by Chakali Akhilesh 5 years, 4 months ago
- 3 answers
Anand Sagar Mathematician 5 years, 4 months ago
Posted by Chakali Akhilesh 5 years, 4 months ago
- 5 answers
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Posted by Darsh Patel 5 years, 4 months ago
- 1 answers
Yogita Ingle 5 years, 4 months ago
Double Displacement Reaction:Reactions in which ions are exchanged between two reactants forming new compounds are called double displacement reactions.
<i>AB + CD → AC + BD</i>
Example: When solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.
<i>BaCl2 + Na2SO4 → BaSO4 + 2NaCl</i>
Posted by Disha Dhadiwal 5 years, 4 months ago
- 1 answers
Posted by Sunidhi Singh 5 years, 4 months ago
- 1 answers
Gaurav Seth 5 years, 4 months ago
Water of crystallisation is a fixed number of water molecules present in one formula unit of a salt. One formula unit of copper sulphate contains five water molecules (5H20). The water molecules which form part of the structure of a crystal are called water of crystallisation. When hydrated salts are heated strongly, they lose their water of crystallisation.
On strong heating, blue copper sulphate crystals turn white (due to the loss of water of crystallisation).
Posted by Sunidhi Singh 5 years, 4 months ago
- 3 answers
Sunidhi Singh 5 years, 4 months ago
Gaurav Seth 5 years, 4 months ago
NAHCO3
Baking soda is nothing but sodium bicarbonate, which can be denoted by the chemical formula NaHCO3. Baking soda is basically a salt that comprises a sodium cation which can be represented as Na+ and a bicarbonate anion which can be represented as HCO3–.
Baking soda is a white, crystalline solid that has a salty taste. It is quite useful in baking as a leavening agent – a substance that causes foaming, leading to the softening of the mixture. It is also referred to as sodium hydrogen carbonate.
Posted by Sunidhi Singh 5 years, 4 months ago
- 3 answers
Gaurav Seth 5 years, 4 months ago
Calcium Carbonate is the chemical name for limestone.
Limestone is a carbonate sedimentary rock that is often composed of the skeletal fragments of marine organisms such as coral, foraminifera, and molluscs.
Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).
Posted by Chakali Akhilesh 5 years, 4 months ago
- 3 answers
Yogita Ingle 5 years, 4 months ago
Cellular Respiration: breaking down sugar in the presence of oxygen (aerobic).
Posted by Tejas Mahajan 5 years, 4 months ago
- 3 answers
Soumya Porwal 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.
Consider the following redox reaction.
- Burning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.
|
C6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l) |
- Reaction of zinc oxide and carbon.
ZnO + C --> Zn + CO
In this reaction carbon is oxidised to CO and ZnO is reduced to Zn.
Gaurav Seth 5 years, 4 months ago
Oxidation- Reduction reaction
A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.
Consider the following redox reaction.
- Burning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.
|
C6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l) |
- Reaction of Manganese dioxide with hydrochloric acid involves redox reaction.
- Reaction of zinc oxide and carbon.
ZnO + C --> Zn + CO
In this reaction carbon is oxidised to CO and ZnO is reduced to Zn.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Posted by Chakali Akhilesh 5 years, 4 months ago
- 3 answers
Yogita Ingle 5 years, 4 months ago
Catabolism is the set of metabolic pathways that breaks down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions.
Posted by Ayush Kapoor 5 years, 4 months ago
- 1 answers
Yogita Ingle 5 years, 4 months ago
Thermite is a pyrotechnic composition of aluminium powder and a metal oxide. It produces an aluminothermic reaction known as a thermite reaction.
The reaction of iron (III) oxide and aluminum can be represented by the equation:
Fe2O3 (s) + 2 Al (s) → Al2O3 (s) + 2 Fe (s)
This reaction is known as the “thermite” process, which has been used industrially for welding that is the preparation of metals from their oxides, and the production of incendiary devices. The process is initiated by heat, but then becomes self-sustaining.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Ayush Kapoor 5 years, 4 months ago
Posted by Chakali Akhilesh 5 years, 4 months ago
- 2 answers
Yogita Ingle 5 years, 4 months ago
The two lungs and their pleural sacs are situated in the thoracic cavity . The pleura is a thin, glistening, slippery serous membrane, inflammation of which is called pleurisy. The pleura lines the thoracic wall and diaphragm, where it is known as the parietal pleura. It is reflected onto the lung, where it is called the visceral pleura.
So, option lungs is correct answer.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 4 answers
Yogita Ingle 5 years, 4 months ago
The epiglottis is a leaf-shaped flap in the throat that prevents food from entering the windpipe and the lungs. It stands open during breathing, allowing air into the larynx.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 4 answers
Yogita Ingle 5 years, 4 months ago
- During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes places in the muscles cells to fulfil the demand for energy. This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles. The accumulation of lactic acid in muscles leads to muscle cramps.
- HenceDuring heavy exercise, we get cramps in the legs due to the accumulation of Lactic acid.
- So, the correct answer is 'Lactic acid'.
Posted by Chakali Akhilesh 5 years, 4 months ago
- 3 answers
Posted by Chakali Akhilesh 5 years, 4 months ago
- 3 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Abhishek Gurjar 5 years, 4 months ago
2Thank You