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netineya [11]
3 years ago
12

In which block of the periodic table should iron be placed

Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
8 0
Iron should be in the 3d block

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What is the uncertainty for each of the following numbers? a) 65.74 b) 60.009 c) 66_ _d) 65.750
alex41 [277]

Answer:

a) 65.74 ± 0.01

b) 60.009 ± 0.001

c) 66 ± 1

d) 65.750 ± 0.001

Explanation:

When reporting results, scientist usually specify a range of values that they expect this "true value" to fall within. The most common way to show this range of values is:  measurement = best estimate ± uncertainty

Uncertainties are almost always quoted to one significant digit (example: ±0.05 s).  

Wrong: 34.3 cm ± 4.3 cm

Correct: 34 cm ± 4 cm  

Always round the experimental measurement or result to the same decimal place as the uncertainty.  

Wrong: 1.237 s ± 0.1 s

Correct: 1.2 s ± 0.1 s

Therefore for to answer the question:

a) 65.74 ± 0.01

b) 60.009 ± 0.001

c) 66 ± 1

d) 65.750 ± 0.001

I hope you find this information useful and interesting! Good luck!

5 0
3 years ago
Which option should a person avoid doing in order to better protect the quality of watersheds?
Norma-Jean [14]

"People should remove native plants around watersheds" option should a person avoid doing in order to better protect the quality of watersheds.

<u>Option: A</u>

<u>Explanation:</u>

Watershed is basically a source of large amount of water like river, sea, etc to another location like lake, ponds and stream.This is seen majorly during rainy season by water harvesting to supply further for farming, portable water plant, manufacturing sectors, enrich habitat to number of plants and animals, etc. Waterways face issues when erosion, pollutants and runoff of animal waste take place, which act as barrier for water flow, as it decreases the quality which affect aquatic animals life, reduce oxygen content. Native plants near watersheds is also a habitat for many animals and species thus it should not be removed until some major flaw occurs.

5 0
3 years ago
Explain, in terms of subatomic particles, why the radius of a chloride ion is larger than the radius of a chlorine atom.
den301095 [7]
The radius of a chlorine ion is larger than the radius of a chlorine atom because  the effective nuclear charge decreases, therefore the inward force decreases, increasing the ionic radius.
6 0
3 years ago
A carbon forms one bond to an X atom plus three more bonds to three hydrogen atoms. If the hybridization to X has 81% p-characte
liraira [26]

Answer:

110 degree

Explanation:

This is because Hybridization of an s orbital with all three p orbitals (px , py, and pz) results in four sp3 hybrid orbitals. sp3 hybrid orbitals are oriented at bond angle of 109.5 degrees from each other. This 109.5 degrees gives an arrangement of tetrahedral geometry

5 0
3 years ago
Dalton’s Law CalculationA mixture of H₂, N₂ and Ar gases is present in a steel cylinder. The total pressure within the cylinder
Zolol [24]

Answer:

A) The partial presssure of CO₂ is 167 mm Hg

B) The partial presssure of N₂ is 354 mm Hg

C) The partial presssure of Ar is 235 mm Hg

D) The partial presssure of H₂ is 86 mm Hg

Explanation:

Dalton's law of partial pressures is basically expressed by the following statement:

The total pressure of a mixture is equal to the sum of the partial pressures of its components.

So initially we have:

P_{T}= total presure of the system (675 mm Hg).

P_{N_2}= partial pressure of N₂ (354 mm Hg).

P_{Ar}= partial pressure of Ar (235 mm Hg).

Using Dalton's law we can find the partial pressure of H₂:

P_{T}=P_{N_2}+P_{Ar}+P_{H_2}

675 mm Hg=354 mm Hg + 235 mm Hg + P_{H_2}

P_{H_2}= 675 mm Hg - 354 mm Hg - 235 mm Hg

P_{H_2}=86 mm Hg

If CO₂ gas is added to the mixture, at constant temperature, and the volume is the same, the difference between the new total pressure and the previous total pressure is equal to the partial pressure of CO₂.

P_{T}=P_{N_2}+P_{Ar}+P_{H_2}+P_{CO_2}

842 mm Hg= 354 mm Hg + 235 mm Hg + 86 mm Hg + P_{CO_2}

P_{CO_2}= 842 mm Hg - 354 mm Hg - 235 mm Hg - 86 mm Hg

P_{CO_2}= 167 mm Hg

4 0
3 years ago
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