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Rohit Dabas 6 years, 7 months ago
Yogita Ingle 6 years, 7 months ago
| Basis | Accuracy | Precision |
| Definition | It could be defined as the level of correctness of a measurement to its true value. | It could be defined as the sharp exactness of a measurement. |
| Measurement Method | Has one factor used for measuring. | Has multiple factors for measurement. |
| Mutual Relationship | Accurate items have to be precise in most cases. | Precise items may or may not be accurate. |
Posted by Preeti Rahi 6 years, 7 months ago
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Allan Krish 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
The Spin Quantum Number (ms) describes the angular momentum of an electron. An electron spins around an axis and has both angular momentum and orbital angular momentum. Therefore the first electron in an orbital will have a spin of +1/2. After all the orbitals are half filled, the electrons start to pair up.
Posted by Karthic Aryaas 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
Given,5% sugar solution means, {tex}w_B{/tex} = 5g
{tex}{w_A} = 95g,\,{M_B} = 342g\,mo{l^{ - 1}}{/tex}
Similarly, for 5% glucose solution, {tex}{w_B}(glu\cos e) = 5g{/tex}
{tex}{w_A} = 95\,g\,and {M_B}(glu\cos e) = 180\,g\,mo{l^{ - 1}}{/tex}
{tex}\Delta {T_f}(cane\,sugar) = \,273.15K - 271K = 2.15K{/tex}
{tex}\Delta {T_f} = \frac{{{K_f} \times {w_B} \times 1000}}{{{M_B}{w_A}}}{/tex}
{tex}2.15 = \frac{{{K_f} \times 5 \times 1000}}{{342 \times 95}}{/tex}
{tex}{k_f} = \frac{{2.15 \times 342 \times 95}}{{5 \times 1000}} = 13.9707{/tex}
similarly, for glucose
{tex}\Delta {T_f}(glu\cos e) = \frac{{13.9707 \times 5 \times 1000}}{{180 \times 95}}{/tex}
{tex}\Delta {T_f} = 4.085K{/tex}
Freezing point of the solution
= 273.15K - 4.085K = 269.065 K
Posted by Shivani Sharma 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
The Einstein Field Equation (EFE) are also known as Einstein’s equation. There are the set of ten equations extracted from Albert Einstein’s General Theory of Relativity. The EFE describes basic interaction of gravitation. The equations were first published in 1915 by Albert Einstein as a tensor equation.
Posted by Satyam Krishna 6 years, 7 months ago
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Yogita Ingle 6 years, 7 months ago
Metals-
Metals are usually solid but mercury is metal which is a liquid.
According to the properties of metals, metals are hard but sodium and potassium is so soft that it can be cut with a knife.
Nonmetals-
Graphite is a nonmetal that can conduct electricity. (We generally know that nonmetals are insulators)
Posted by Santosh Kumar Singh 6 years, 7 months ago
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Sia ? 6 years, 7 months ago
This is a simple question of Limiting Reagent.
Here is the balanced Equation : 2H2S +SO2 {tex}\rightarrow{/tex} 2H2O + 3S
Thus if 2 moles of H2S reacts with 1 mol of SO2 then 3 moles of S will be formed
But in the given condition, SO2 is only half mole (11.2 L of gas at STP represents half mole), thus it is limiting Reagent.
Thus if 1 mol of SO2 gives 3 moles of sulfur, then 0.5 Moles of it will give 1.5 moles of sulfur.
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Gaurav Seth 6 years, 7 months ago
Note: While the question says that the mass no. of oxygen is 17, in reality it is 16. However since the question asks for it I am taking the value as 17.
Atomic no. is the number of electrons = no. of protons present in an atom.
Atomic Mass is the sum of the number of protons and neutrons present in an atom.
Let
Atomic number = P = 8
Let Atomic mass = N + P = 17
N = 17 - 8
N = 9
Therefore there are 9 neutrons ina single atom of oxygen.
Therefore total no. of neutrons = 9 × 12 × 10^25 = 108 × 10^25 = 1.08 × 10^27
Answer
1.08 × 10^27 neutrons.
☆Note: Once again, while the question says that the mass no. of oxygen is 17, in reality it is 16. However since the question asks for it I am taking the value as 17.
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Yogita Ingle 6 years, 7 months ago
Quantum numbers: Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.
Four quantum numbers are used to define the state of an electron completely, namely principal quantum number, azimuthal quantum number, magnetic quantum number and spin quantum number.
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