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3 years ago

Which of the following pairs of elements is most likely to form an ionic bond?

1 answer:

5 0

While the other pairs, sodium and potassium are the metals, nitrogen and iodine, chlorine and bromine, helium and oxygen are the non-metals. They do not form ionic bond. Hence, the correct pairs of elements likely to form ionic compounds are, potassium and sulfur, magnesium and chlorine

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Suppose that a certain biologically important reaction is quite slow at physiological temperature (37 oC) in the absence of a ca

Oksi-84 [34.3K]

Answer:

30 kJ

Explanation:

Arrhenius equation is given by:

$k=Aexp(-Ea/RT)\\$

Here, k is rate constant, A is Pre-exponential factor, Ea is activation energy and T is temperature.

taking natural log of both side

ln k = ln A - Ea/RT

In Arrhenius equation, A, R and T are constant.

Therefore,

$ln\frac{k_2}{k_1} =\frac{Ea_1-Ea_2}{RT}$

$Ea_1-Ea_2$ is the lowering in activation energy by enzyme,

R = 8.314 J/mol.K

T = 37°C + 273.15 = 310 K

$\frac{k_2}{k_1} =1\times 10^5$

$ln 1\times 10^5 =\frac{Ea_1-Ea_2}{RT}\\{Ea_1-Ea_2} = 11.512 \times 8.314 \times 310\\=29670\ J\\=30\ kJ$

4 0

3 years ago

Large area lakes and rivers are an important natural resource. These Major bodies of water help create ________________ for huma

PilotLPTM [1.2K]

I think it would be habitat

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3 years ago

What is the definition of toxicity?

larisa [96]

Answer:

The level of toxins in solutions

4 0

3 years ago

Read 2 more answers

One of the chair conformers of cis-1,3-dimethylcyclohexane is 5.4 kcal/mol less stable than the other. How much steric strain do

Karolina [17]

Answer:

See explanation

Explanation:

the Cis structure, we can have two possibilities. The methyl groups can go both in axial positions or both in equatorial positions. We have to remember that cis it means "same orientation", so in the axial positions, both methyl groups go up. (Both have the same orientation). In the equatorial positions, both groups go down.

In the axial positions, we will have more steric hindrance because the groups are close to each other. Therefore, we will have more energy and the structure will be less stable. In the equatorial positions, we dont have any steric hindrances, so we will have less energy and more stability.

See figure 1

I hope it helps!

7 0

3 years ago

3. Humans discovered how to use fire and tools. How was this knowledge passed along to younger generations?

vlabodo [156]

Communication skills were developed so knowledge could be passed along to younger generations.

<h3>How knowledge will pass through generations?</h3>

Knowledge will pass from one generation to another with the help of education. The skill people give education to their youngers about fire and tools. In this way, skills of fire and tools pass from one generation to another.

So we can conclude that communication skills were developed so knowledge could be passed along to younger generations.

Learn more about knowledge here: brainly.com/question/24621985

#SPJ1

6 0

1 year ago