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OLEGan [10]
2 years ago
8

Please help me with this! I’ll mark you brainiest if it’s correct. I do know it’s either A or C

Chemistry
2 answers:
8090 [49]2 years ago
8 0
It is A
I only know that Lithium does not have Roman numerals after it only certain elements do so yea!
Volgvan2 years ago
6 0

Answer:

the correct answer is A

Explanation:

You might be interested in
1 mol super cooled liquid water transformed to solid ice at -10 oC under 1 atm pressure.
Arada [10]

Answer:

Explanation:

Given that:

number of moles of super cooled liquid water = 1

Melting enthalpy of ice = 6020 J/mol

Freezing point =0 °C = (0 + 273 K)= 273 K

The decrease in entropy of the system during freezing for 1 mol (i.e during transformation from liquid water to solid ice )  = - 6020 J/mol × 1 mol /273 K = -22.051 J/K

Entropy change during further cooling from 0 °C (273 K) to -10 °C (263 K)

\Delta \ S = \int\limits^{T_2}_{T_1}\dfrac{nC_p(s)dT}{T}

\Delta \ S = {nC_p(s)In \dfrac{T_2}{T_1}

\Delta \ S = {(1*37.7)In \dfrac{263}{273}

Δ S = -1.4 J/K

Total entropy change of the system = - 22.05 J/K - 1.4 J/K = - 23.45 J/K

Entropy change of universe = entropy change of the system+ entropy change of the surrounding

According to the second law of thermodynamics

Entropy change of universe  >0

SO,

Entropy change of the system + entropy change in the surrounding > 0

Entropy change in the surrounding > - entropy change of the system

Entropy change in the surrounding > - (- 23.53 J/K)

Entropy change in the surrounding > 23.53 J/K

b) Make some comments on entropy changes from the obtained data.

From the data obtained; we will realize that the entropy of the system decreases as cooling takes place when water is be convert to ice , randomness of these molecules reduces and as cooling proceeds , hence, entropy reduces more as well and the liberated heat will go into the surrounding due to this entropy of the surrounding increasing.

4 0
2 years ago
How were the fossil symbols and mountain belts helpful in deciding where to move the continents
topjm [15]
The age of the fossil n how they look??
7 0
3 years ago
3. What detrmines the identity of an atom?​
Brrunno [24]
The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. ... The atomic mass of an element is the total number of protons and neutrons in the nucleus of the atom.
5 0
2 years ago
Which equation correctly represents the first electron affinity (ea1) of calcium?
AleksandrR [38]

Answer :

The correct answer is : Ca (g) + e^- \rightarrow Ca^- (g)

Electron Affinity :

It is defined as energy released  or absorbed when an electrons is added to neutral isolated atom in gaseous state .

The first electron affinity is the energy absorbed or released when one electron is to  outermost  shell of a neutral atom .

The first electron affinity  is generally negative , when electron is added to non metals .  While when electron  is added to metals , the electron affinity is positive.

More the negative electron affinity , more the atom has tendency to accept the electron .

For example :  F(g) + e⁻  → F⁻(g)   ΔH⁰ = - 328.0\frac{KJ}{mol}

- 328.0\frac{KJ}{mol}  represents  first electron affinity of Fluorine atom .

First electron affinity for Calcium can be written as :

The symbol for Calcium in its ground state is Ca . Since the electron (e⁻) is added so it is written on left  side or reaction . The calcium will accept the electron and will form a negative ion as Ca⁻ .

Hence the equation goes as

Ca (g) + e^-\rightarrow Ca^- (g)


4 0
3 years ago
Read 2 more answers
Calculate the following quantity: volume of 1.58 M calcium chloride that must be diluted with water
Alekssandra [29.7K]
Just multiply rnrndosksmjwjdjzkzkkoaoalwkakaka 994 the dozens
4 0
3 years ago
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