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Citrus2011 [14]
3 years ago
7

How many valence electrons do the elements in column 4 have? Are these elements very reactive?

Chemistry
1 answer:
Makovka662 [10]3 years ago
4 0

Answer:

Explanation: Elements in group 14 have 4 valence electrons. Meaning that to achieve a stable octet they need to either gain or lose 4 electrons in total. That would take significantly more energy than other elements, e.g., group 1 (alkaline metals) or group 17 (halogens.)

Explanation:

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Which line of evidence has been traditionally accepted as conclusive proof of evolution? the presumed age of the Earth the fossi
Nataly_w [17]

The most generally accepted form of conclusive evidence for the theory of Evolution is the fossil record.

<h3>What is the theory of Evolution?</h3>
  • The theory of evolution was proposed by Charles Darwin.
  • It states that as time passes, organisms evolve to better adapt to their environments.
  • This is closely related to natural selection, which is considered a <em><u>driving force of </u></em><em><u>evolution</u></em><em><u>. </u></em>

<h3>How the fossil record supports this theory</h3>
  • The fossil record provides essential data to support this claim.
  • The data comes in the form of the comparison between fossils of two closely related organisms, separated by a matter of generations, that <em><u>present changes in the genetic code that made them more apt for survival.</u></em>

Therefore, we can confirm that the most generally accepted form of conclusive evidence for evolution is the presence of <u>fossils </u><u>that show the genetic correlation between two organisms and the progression of </u><u>evolution </u><u>between them. </u>

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5 0
3 years ago
Which of the following choices has the ecological levels listed from largest to smallest?
wariber [46]

Answer:

the answer is something  

Explanation:

3 0
3 years ago
Which of the following has a relationship with amplitude in waves? *
Natasha2012 [34]

Answer:

energy

Explanation:

The amount of energy carried by a wave is related to the amplitude in waves.

6 0
3 years ago
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What tools would you use to measure the density of a rectangular block?
dimulka [17.4K]
A scale and a ruler. The scale to measure the mass, and a ruler to measure the volume.
3 0
3 years ago
He equation for the dissociation of pyridine is
sergeinik [125]

Answer:

10.10

Explanation:

Step 1: Write the basic dissociation reaction for pyridine

C₅H₅N(aq) + H₂O(l) ⇌ C₅H₅NH⁺(aq) + OH⁻(aq)      Kb = 1.9 × 10⁻⁹

Step 2: Calculate [OH⁻]

For a weak base, we will use the following expression.

[OH⁻] = √(Cb × Kb) = √(9.2 × 1.9 × 10⁻⁹) = 1.3 × 10⁻⁴ M

Step 3: Calculate pOH

We will use the definition of pOH.

pOH = -log [OH⁻] = -log 1.3 × 10⁻⁴ = 3.9

Step 4: Calculate pH

We will use the following expression.

pH = 14 - pOH = 14 - 3.9 = 10.10

3 0
3 years ago
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