Explanation:
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arrow_backSources of Information on Modern Indian History
Summary
Videos
References
A primary source of information for historians is the official records of the British administration. The British kept written records of every key instruction, meeting, transaction, investigation, plan, policy decision and agreement. They attached record rooms with all the important administrative institutions.
The British built specialized institutions like museums and archives to preserve important documents.
Historians gather important information about the provincial administrative system from the reports, memos, notings and letters preserved in the 19th century in the archives and record rooms across India.
For effective administration, the British carried out a number of surveys in the early 19th century.
By the end of the 19th century, censuses of all the Indian provinces were being carried out every ten years. This helped to collect information on the religion, caste and occupation of the people. These surveys have helped historians to collect information about modern India.
Personal diaries of personalities like Jawaharlal Nehru and Sardar Vallabhbhai Patel, newspapers, popular books like The Discovery of India and Glimpses of World History, autobiographies of personalities like Mahatma Gandhi, and accounts of travellers and pilgrims give a deep insight into the lives of the common people.
already answered but i would appreciate it if someone checked for me !!
Answer:
correct
Explanation:
I belve ou got it
What is the amount of heat, in joules, required to increase the temperature of a 49.5-gram sample of water from 22°C to 66°C?
1) 2.2 x 103^3 J
2) 4.6 10^3 J
3) 9.1 x 10^3 J
4) 1.4 x 10^4 J
Answer:
3) 9.1 x 10^3 J
Explanation:
When 11.2 liters of hydrogen gas is made by adding zinc to sulfuric acid, what mass
of zinc is needed?
Zn + H2SO4 -> H2 + ZnSO4
32.7 g Zn
Explanation:
First convert the amount of gas into moles:
11.2 L H2 × (1 mol H2/22.4 L H2) = 0.500 mol H2
Then use the molar ratio to find the amount of zinc necessary to produce the amount of gas above:
0.500 mol H2 × (1 mol Zn/1 mol H2)
= 0.500 mol Zn
Now use the molar mass of zinc to find the number of grams of zinc for the reaction to occur:
0.500 mol Zn × (65.38 g Zn/1 mol Zn)
= 32.7 g Zn
bf3 can be octet or not
Answer:
(BH3 follows the octet rule by dimerizing, as Hadi Kurniawan AR pointed out.) For H and He, an "octet" = 2 electrons. Boron does prefer to follow the octet rule, in that it likes to form borate compounds such as NaBH4. It also is happy to form compounds with elements with lone pairs.
Nitrogen is a group 15 element. What does being In this group imply about the structure of the nitrogen atom?
Answer:
Nitrogen has 5 valence electrons
Explanation:
nitrogen has it's attoms form triple bonds which are very hard to break
so non-reactive
ASAP!!!!!!!!!!!!A marble bag contains 10 red marbles, 19 yellow marbles, and 29 green marbles. What is the % composition of each color marble in the bag?
Answer:
Red: 17.24%
Yellow: 32.76%
Green: 50%
Explanation:
Which of the following issues surrounding nuclear power creates the biggest
concern?
A. Where nuclear power should be used
B. How to deal with the radioactive waste
c. How many power plants should be built
O D. What nuclear power should be used for
Question : Which issue surrounding nuclear power creates the biggest concern?
Answer : How to deal with the radioactive waste (B)
The following issues surrounding nuclear power that create the biggest concern is What nuclear power should be used for?
What is nuclear power?Nuclear powers are those powers that are produced by nuclear reactions. These reactions include nuclear fission, nuclear fusion, and nuclear decay. Nuclear power is currently in use to produce electricity. The reaction uses uranium and plutonium reaction to produce electricity.
Nuclear power is used for generating electricity, and it is necessary to use the correct radioisotopes to produce electricity.
Thus, the correct option is D. What nuclear power should be used for?
Learn more about nuclear power, here:
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Which event is a chemical change?
O a) The paint cracks and chips,
O b) The roof
the car dents
Oc) The baseball strikes the roof.
O d) The exposed metal rusts.
i already solved this but can someone check !!
the periodic table below shows major regions in different colors. which answer choice describes all nonmetals?
A. hydrogen and all of the elements in blue boxes
B. hydrogen and all of the other elements in orange boxes
C. all elements of group 18 in orange boxes
D. all of the elements of period 2 in green boxes
PLS HELP!!
Answer:
b
Explanation:
because it's more orange in the boxes then others
Which of the following elements is a metalloid (semimetal)?
C
P
Sb
N
In
Answer:
Sb
Explanation:
Sb (antimony) is an metalloid
When objects of two different temperatures are in contact, what happens?
Answer:
If two objects at different temperatures are brought in contact with each other, energy is transferred from the hotter to the colder object until equilibrium is reached and the bodies reach thermal equilibrium.
Explanation:
what is the chemical formula : hydrogen and chlorine ?
Answer:
HCl
Explanation:
The closest living relatives to Gorillas are:
(Look at pic)
A. Humans
B. Chimpanzees, and humans equally
C. Orangutans
D. Chimpanzees
(DO NOT ANSWER IF YOU CANNOT ACTUALLY HELP)
4. If the relative molecular mass of CH20 is 60.
calculate its empirical formula. (C = 12. H = 1
0 = 16)
A 4
В І
C2
D 3
Answer:
C2H4O2
Explanation:
because you do mr of CH2O= 12+2+16=30
so 60÷30=2 empirical units
so CH2O × 2=C2H4O2
hope this helps :)
The Empirical formula of the given compound is CH₂O
What is Empirical formula ?A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Empirical formula mass = 12g/mol + 2 g/mol + 16 g/mol = 30 g/mol
Molecular formula mass / Empirical formula mass = 60 g/mol / 30 g/mol
= 2
Molecular formula = 2 × CH₂O = C₂H₄O₂
Empirical formula = CH₂O
Empirical formula mass = 12g/mol + 2 g/mol + 16 g/mol = 30 g/mol
Therefore, The Empirical formula of the given compound is CH₂O
Learn more about Empirical formula here ;
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Which value could be the y-coordinate for point Q?
215
42
2/13
8/2
Which statement best supported by the data on the map
The correct pathway for air entering the human respiratory system is _______.
A)nose, trachea, alveoli, bronchi
B)nose, bronchi, trachea, alveoli
C)alveoli, trachea, epiglottis, nose
D)nose, trachea, bronchi, alveoli
Answer: D
Explanation:
Pleaseee helpppp.....
Answer:
C. All of the above
Explanation:
They all happen beyond critical point.
why does shampoo remove hair grese for chemistry acids and alkali
Determine the number of subatomic particles in bromine-35.
Number of subatomic particles=35+36+35=106
Explanation:
Atomic number=35
Mass number=71
No. of proton p=35
No. of neutron n=71−35=36
No. of electron e=35
A location along stream where most erosions occur
Answer:
At a stream's headwaters, often high in the mountains, gradients are steep. The stream moves fast and does lots of work eroding the stream bed.As a stream moves into lower areas, the gradient is not as steep. Now the stream does more work eroding the edges of its banks.
hope that helps bby<3
When the products of a reaction have less energy than the reactants
Answer:
the energy of the products is less than the energy of the reactants.
Explanation:
the the change is enthalpy is negative, and heat is released to the surroundings.
Consider the following chemical reaction:
HF + NaOH - NaF + H20
Energy must be invested in order for the reaction to proceed.
What bonds must be broken in order for the reaction to proceed.
Select ALL that apply.
A. An ionic bond between sodium and hydroxide.
B. An ionic bond between sodium and fluorine.
C. A covalent bond between sodiume and fluorine.
D. An ionic bond between hydrogen and fluorine.
DE. A covalent bond between hydrogen and fluorine.
DE A covalent bond between hydrogen and oxygen
Answer: The correct options are A and E
Explanation:
A chemical reaction is defined as the reaction in which two or more chemical substances react to form two or more different chemical substances.
A new substance (product) is formed in a chemical reaction when the bonds between the reactants are broken so that the new bonds between the products can be formed.
For a given chemical reaction:
[tex]HF+NaOH\rightarrow NaF+H_2O[/tex]
Here,
HF is a covalent compound as sharing of electrons take place between hydrogen and fluorine atom
NaOH is an ionic compound as a complete transfer of electrons occurs from sodium to hydroxide.
Thus, to form the products, an ionic bond between sodium and hydroxide must be broken coupled with a covalent bond between hydrogen and fluorine.
Hence, the correct options are A and E
Explain a polar molecules and give examples
What force is important in the creation of both coal and petroleum?
Explanation:
heat and pressure are two main forces that transform organic matter into fossil fuels
A 13 Ohm resistor, R, is connected to a battery with unknown voltage, V, as shown below. The total current, I, flowing through the circuit is 1.24 Amperes. Find the unknown voltage, V, of the battery in Volts. Round your answer to 2 decimal places
Answer:
16.12 V
Explanation:
Ohms law explains or portrays the relationship between the voltage (V), current (I) and resistance (R). This is represented using the equation as follows:
V = IR
Where;
V = voltage (Volts)
I = current (amperes)
R = resistance (ohms)
According to the information provided in the question, resistance (R) = 13 Ohm, current (I) = 1.24 Amperes, V = ?
V = 13 × 1.24
V = 16.12 V
25 g of NH, is mixed with 4 moles of O, in the given reaction:
4NH,(g) + 50 (8) 4NO(g) + 6H,O(1)
a Which is the limiting reactant?
b What mass of NO is formed?
c What mass of H2O is formed?
Answer:
a. NH3 is limiting reactant.
b. 44g of NO
c. 40g of H2O
Explanation:
Based on the reaction:
4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(l)
4 moles of ammonia reacts with 5 moles of oxygen to produces 4 moles of NO and 6 moles of water.
To find limiting reactant we need to find the moles of each reactant and using the balanced equation find which reactant will be ended first. Then, with limiting reactant we can find the moles of each reactant and its mass:
a. Moles NH3 -Molar mass. 17.031g/mol-
25g NH3*(1mol/17.031g) = 1.47moles NH3
Moles O2 = 4 moles
For a complete reaction of 4 moles of O2 are required:
4mol O2 * (4mol NH3 / 5mol O2) = 3.2 moles of NH3.
As there are just 1.47 moles, NH3 is limiting reactant
b. Moles NO:
1.47moles NH3 * (4mol NO/4mol NH3) = 1.47mol NO
Mass NO -Molar mass: 30.01g/mol-
1.47mol NO * (30.01g/mol) = 44g of NO
c. Moles H2O:
1.47moles NH3 * (6mol H2O/4mol NH3) = 2.205mol H2O
Mass H2O -Molar mass: 18.01g/mol-
2.205mol H2O * (18.01g/mol) = 40g of H2O
Answer:
a) NH₃ is the limiting reactant
b) 44.1 g NO
c) 39.7 g H₂O
Explanation:
The chemical equation is the following:
4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(l)
According to the balanced chemical equation, 4 moles of NH₃ reacts with 5 moles of O₂ to produce 4 moles of NO and 6 moles of H₂O.
a) To determine which is the limiting reactant we have to compare the stoichiometric amounts of reactants (NH₃ and O₂) with the actual amounts.
Stoichiometric amounts:
Molecular weight of NH₃= 14 g/mol + (1 g/mol x 3) = 17 g/mol
Stiochiometric amount of NH₃ = 4 moles NH₃ x 17 g/mol = 68 g NH₃
Stiochiometric amount of O₂ = 5 moles
⇒ Stiochiometric ratio = 68 g NH₃/5 moles O₂
Then, we multiply the stoichiometric ratio by the actual amount of O₂ to calculate the required amount of NH₃:
required NH₃ = 4 moles O₂ x 68 g NH₃/5 moles O₂ = 54.4 g NH₃
Thus, we need 54.4 grams of NH₃ to completely react with 4 moles of O₂, but we only have 25 grams of NH₃. Therefore, NH₃ is the limiting reactant.
b) To calculate the amount of NO formed, we use the limiting reactant (NH₃). According to the equation, 4 moles of NH₃ produce 4 moles of NO.
Molecular weight NO = 14 g/mol + 16 g/mol = 30 g/mol
4 mol NH₃ x 17 g/mol = 68 g NH₃
4 mol NO x 30 g/mol = 120 g NO
⇒ Stiochiometric ratio = 120 g NO/68 g NH₃
Now, we multiply the stoichiometric ratio by the actual amount of NH₃ to calculate the mass of NO formed:
NO formed = 25 g NH₃ x 120 g NO/68 g NH₃ = 44.1 g NO
c) According to the chemical equation, 4 moles of NH₃ (68 g) produce 6 moles of H₂O.
Molecular weight H₂O = (2 x 1 g/mol) + 16 g/mol = 18 g/mol
6 mol H₂O x 18 g/mol = 108 g H₂O
⇒ Stoichiometric ratio = 108 g H₂O/68 g NH₃
Finally, we multiply the stoichiometric ratio by the actual amount of NH₃ (limiting reactant) to obtain the mass of H₂O formed:
H₂O formed = 25 g NH₃ x 108 g H₂O/68 g NH₃ = 39.7 g H₂O
This cell is dividing into two cells.
Answer:
answer: B or D
Explanation:
hope it helps thanks❤
Q1.what is irragation
Answer:
Irrigation is the artificial process of applying controlled amounts of water to land to assist in production of crops. Irrigation helps to grow agricultural crops, maintain landscapes, and revegetate disturbed soils in dry areas and during periods of less than average rainfall.
Answer: The watering of crop plants in regular intervals is known as irrigation. ... Weeds are unwanted plants thet grows with the crop plants. Weeding means to remove those plants. It is done manually or by machine. Using khurpi it is done manually and using seed drill it is done by machine.
Explanation:
Irrigation is the artificial application of water to the soil through various systems of tubes, pumps, and sprays. Irrigation is usually used in areas where rainfall is irregular or dry times or drought is expected.
Hope it helps
