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anzhelika [568]
3 years ago
11

Which of the following elements is a transition metal? Select one: a. tin b. tellurium c. copper d. cesium

Chemistry
2 answers:
gayaneshka [121]3 years ago
7 0
Copper (Cu) is a transition metal.
zhenek [66]3 years ago
5 0

<u>Answer:</u> The correct answer is Option c.

<u>Explanation:</u>

Transition metals are defined as the metals in which last electron of the atom enters d-subshell. Elements belonging to Groups 3 to Group 12 are considered as transition metals.

For the given options:

<u>Option a:</u> Tin

The number of electrons of this element are 50.

Electronic configuration of this element = Sn:[Kr]5s^24d^{10}5p^2

As, last electron is entering the p-subshell, therefore it is considered as a p-block element.

<u>Option b:</u> Tellurium

The number of electrons of this element are 52.

Electronic configuration of this element = Te:[Kr]5s^24d^{10}5p^4

As, last electron is entering the p-subshell, therefore it is considered as a p-block element.

<u>Option c:</u> Copper

The number of electrons of this element are 29.

Electronic configuration of this element = Cu:[Ar]4s^13d^{10}

As, last electron is entering the d-subshell, therefore it is considered as a d-block element or transition element.

<u>Option d:</u> Cesium

The number of electrons of this element are 55.

Electronic configuration of this element = Cs:[Xe]6s^1

As, last electron is entering the s-subshell, therefore it is considered as a s-block element.

Hence, the correct answer is Option c.

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Calculate the energy required to melt 21 g of ice at 0 oC.
vladimir1956 [14]

<u>We are given:</u>

Mass of ice = 21 grams

The ice is already at 0°c, the temperature at which it melts to form water

Molar heat of fusion of Ice = 6.02 kJ/mol

<u>Finding the energy required:</u>

<u>Number of moles of Ice: </u>

Molar mass of water = 18 g/mol

Number of moles = given mass/ molar mass

Number of moles = 21 / 18 = 7/6 moles

<u>Energy required to melt the given amount of ice:</u>

Energy = number of moles * molar heat of fusion

Energy = (7/6) * (6.02)

Energy = 7.02 kJ OR 7020 joules

7 0
3 years ago
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pishuonlain [190]
Yes. As long as the ratio of solute and solvent is same for both solution, the solution has the same concentration. for example, solution A has 2 ml of water, and 1 ml of sucrose. Solution B has 4ml of water and 2ml of sucrose. Both has a ratio of water to sucrose by 2 : 1. they have the same concentration of 50% sucrose. 
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telo118 [61]

Answer:

Option (A)

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So for dew point to occur, the air temperature must reach a condition where the air is fully saturated or the relative humidity is 100%.

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romanna [79]
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