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4 years ago

Why are elements with high electron affinities also the most electronegative?

Chemistry

1 answer:

melamori03 [73]4 years ago

7 0

Explanation:

Electron affinity is the energy released in adding an electron to a neutral atom in the gas phase. This is a measure of the readiness of an atom to gain an electron. When an atom gains an electron readily, it has a high electron affinity.

The electronegativity is a property that combines the ability of its atom to lose and gain electrons.
It is expressed as a number that describes the relative tendency with which the atoms of the element attracts valence electrons in a chemical bond.

Therefore , we see that an atom with a high electronegativity will have a very high affinity to gain electrons. It will want to attract electrons by all means to itself.

Learn more:

Electronegativity brainly.com/question/11932624

#learnwithBrainly

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Consider the mechanism. Step 1: A + B ⟶ C A+B⟶C slow Step 2: A + C ⟶ D A+C⟶D fast Overall: 2 A + B ⟶ D 2A+B⟶D Determine the rate

iren [92.7K]

Answer: The rate law expression for the overall reaction is $\text{Rate}=k[A]^2[B]$

Explanation:

Rate law is the expression that expresses the rate of the reaction in terms of the molar concentration of all the reactants each term raised to the power their stoichiometric coefficient in a balanced chemical equation.

In a mechanism of the reaction, the slow step in the mechanism determines the rate of the reaction.

For the given chemical reaction:

$2A+B\rightarrow D$

The intermediate reaction of the mechanism follows:

Step 1: $A+B\rightleftharpoons C;\text{ (slow)}$

Step 2: $A+C\rightarrow D;\text{ (fast)}$

As, step 1 is the slow step. It is the rate determining step

Rate law for the reaction follows:

$\text{Rate}=k[A]^2[B]$

Hence, the rate law expression for the overall reaction is written above.

4 0

3 years ago

Monel metal is a corrosion-resistant copper-nickel alloy used in the electronics industry. A particular alloy with a density of

Blababa [14]

Answer:

Based on the given question, the dimensions of the plate is 15 cm in length, 12.5 cm in width, and 3.50 mm in thickness (0.350 cm). Now the volume of the plate will be,

V = 15 cm × 12.5 cm × 0.350 cm = 65.62 cm³

A hole of diameter 2.50 cm is drilled through the center of the plate, at the height of 3.50 mm or 0.350 cm. Now the volume of the hole is π(r)²h,

= 22/7 × (1.25 cm)² × 0.350 cm = 1.72 cm³

Thus, the volume of the plate will be determined by subtracting the volume of plate with the volume of hole, which will be,

65.62 cm³ - 1.72 cm³ = 63.9 cm³

The density of the alloy is 8.80 g/cm³, therefore, the mass of the alloy can be determined by using the formula, mass = density * volume

mass = 8.80 g/cm³ × 63.9 cm³ = 562.32 grams

Of the total alloy, 0.090 percent is Si, that is,

(0.090/100) × 562.32 g = 0.506 grams of Si

The natural abundance of the element is not determined by mass but by the number of atoms it possess. For this Avogadro's number and atomic mass of Si is used. Now the number of atoms of Si present is,

(0.506 g) (1 mol/28.0855 g) (6.023 × 10²³ atoms /mol) = 1.08 × 10²² Si atoms

Of these Si atoms, 3.10 percent are Si-30 so,

= (3.10 / 100) × (1.08 × 10²² atoms) / 1000 = 3.34 × 10²⁰ atoms of Si-30. or 3.4 × 10²⁰ atoms

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3 years ago

Dissolving 3.0 g of CaCl2(s) in 150.0 g of water in a calorimeter at 22.4 o C causes the temperature to rise to 25.8 o C. What i

pentagon [3]

Answer:

Explanation:

Heat involved Q = mcΔt where m is mass , c is specific heat of water and Δt is rise in temperature

= 150 x 4.18 x 25.8 J .

= 16176.6 J .

As the temperature rises , the reaction is exothermic.

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3 years ago

Consider the balanced equation. CuSO4 + Zn ------> ZnSO4 + Cu If 200.0 g of copper(II) sulfate react with an excess of zinc m

Eva8 [605]

Let's break this down. We know from our balanced equation that (in theory) we'll get the same number of moles of copper out of the reaction that we put into it. So we need to find the number of moles of CuSO4 we have in 200.0 grams. Using the molar mass of CuSO4:
200.0 grams CuSO4 * (1 mole CuSO4)/(159.61 grams CuSO4) =
1.253 moles CuSO4
We know that the moles of CuSO4 and Cu are one-to-one, so we should yield the same number of moles of copper. If we multiply by copper's molar mass, we get:
1.253 moles Cu * (63.55 grams Cu)/(1 mole Cu) = 79.63 grams Cu

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4 years ago

Read 2 more answers

The limiting reactant in a reaction a. is the reactant for which there is the least amount in grams b. is the reactant which has

Shalnov [3]

Actually the correct answer must be:

The limiting reactant in the reaction is the one which has the lowest ratio of moles available over coefficient in the balanced equation

This is because the actual mass or number of moles of the reactant does not directly dictate if it is a limiting reactant, this must be relative to the other reactants.

So the answer is:

e. none of the above

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3 years ago