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3 years ago

Why does iodine have a lower average atomic mass than tellurium?

Chemistry

1 answer:

maw [93]3 years ago

3 0

Answer:

Explanation: tellurium has an atomic mass of 127.6 whilst the element that comes after it, iodine, is lighter with an atomic weight of 126.9. Mendeleev concluded that the atomic mass for one of these two elements must be wrong because tellurium clearly preceded iodine in the periodic table

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Which of the following is an example of an endothermic process?

Zepler [3.9K]

Answer - A. Melting

Reasoning - Melting is your best answer. If the object itself that gets melted from absorption or input of it environment. In chemistry terms.

Rule out - It cant be B or D because it has to do with water cycle and C is incorrect because its from energy force to boiling.

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3 years ago

At constant temperature and pressure, the coefficients for gaseous species in a valences chemical reaction can be interpreted as

xenn [34]

At constant temperature 1246 I need points

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3 years ago

The standard free energy of activation of one reaction A is 95.00 kJ mol–1 (22.71 kcal mol–1). The standard free energy of activ

diamong [38]

Answer:

The answer to the questions are as follows

Reaction B is 4426.28 times faster than reaction A

(b) Reaction B is faster.

Explanation:

To solve the question we are meant to compare both reactions to see which one is faster

The values of the given activation energies are as follows

For A

Ea = 95.00 kJ mol–1 (22.71 kcal mol–1) and

for B

Ea = 74.20 kJ mol–1 (17.73 kcal mol–1)

T is the same for both reactions and is equal to 298 k

Concentration of both reaction = 1M

The Arrhenius Law is given by

k = $Ae^{\frac{-E_{a} }{RT} }$

Where

k = rate constant

Ea = activation energy

R = universal gas constant

T = temperature (Kelvin )

A = Arrhenius factor

Therefore

For reaction A, the rate constant k₁ is given by k₁ = $Ae^{\frac{-95000}{(8.314)(298)} }$

And for B the rate constant k₂ is given by k₂ = $Ae^{\frac{-74200 }{(8.314)(298)} }$

k₁ = A×2.225×10⁻¹⁷

k₂ = A×9.850×10⁻¹⁴

As seen from the above Reaction B is faster than reaction A by (A×9.850×10⁻¹⁴)/(A×2.225×10⁻¹⁷) or 4426.28 times

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3 years ago

How much is 3.5 gallons in cups

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Answer:

3.6 gallons are equal to 56 cups

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What do cations and anions form?

melomori [17]

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3 years ago