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3 years ago

Select the name of the period 4 transition element that forms a 3+ diamagnetic ion.

Chemistry

2 answers:

Juli2301 [7.4K]3 years ago

6 0

Answer:

Scandium

Explanation:

Scandium is a rare earth metal with symbol Sc and atomic number 21.

The chemistry of scandium bears a closer resemblance to that of the other rare-earth elements of oxidation state +3.

Ymorist [56]3 years ago

5 0

The answer is Scandium

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A chemist adds of a M copper(II) fluoride solution to a reaction flask. Calculate the mass in micrograms of copper(II) fluoride

anygoal [31]

The question is incomplete, here is the complete question.

A chemist adds 345.0 mL of a 0.0013 mM (MIllimolar) copper(II) fluoride $CuF_2$ solution to a reaction flask.

Calculate the mass in micrograms of copper(II) fluoride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

Answer : The mass of copper(II) fluoride is, 0.13 mg

Explanation : Given,

Millimolarity of copper (II) fluoride = 0.0013 mM

This means that 0.0013 millimoles of copper (II) fluoride is present in 1 L of solution

Converting millimoles into moles, we use the conversion factor:

1 moles = 1000 millimoles

So, $0.0013mmol\times \frac{1mol}{1000mmol}=1.3\times 10^{-6}mol$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Moles of copper (II) fluoride solution = $1.3\times 10^{-6}mol$

Molar mass of copper (II) fluoride = 101.5 g/mol

Putting values in above equation, we get:

$1.3\times 10^{-6}mol=\frac{\text{Mass of copper (II) fluoride}}{101.5g/mol}\\\\\text{Mass of copper (II) fluoride}=(1.3\times 10^{-6}mol\times 101.5g/mol)=1.32\times 10^{-4}g$

Converting this into milligrams, we use the conversion factor:

1 g = 1000 mg

So,

$\Rightarrow 1.32\times 10^{-4}g\times (\frac{1000mg}{1g})=0.13mg$

Therefore, the mass of copper(II) fluoride is, 0.13 mg

7 0

3 years ago

After identifying the anions (negative ions), in each of the following

natali 33 [55]

I think it’s Agci the answer

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Komok [63]

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3 years ago

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Which of these objects have potential energy?

Korolek [52]

Answer:

it's C. but the sentence is incorrect I think it should be a ball "in" someone's hand

Explanation:

cause potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.

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3 years ago

What is the conclusive evidence that mixing sugar in the water is a physical change

djyliett [7]

THE DEFINITION OF PHYSICAL CHANGE: Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds. so the answer is that the form of the sugar is changing in water but if you boiled the water till its all evaporated all that will be left is the sugar

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4 years ago