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Butoxors [25]
3 years ago
9

Read the false statement. Atoms of elements with one valence electron form anions in order to meet the octet rule. Which answer

choice rewords the false statement so it is true?
a. Atoms of elements with three valence electrons do not form ions because they meet the octet rule.
b. Atoms of elements with five to seven valence electrons form cations in order to meet the octet rule.
c. Atoms of elements with five to seven valence electrons form anions in order to meet the octet rule.
d. Atoms of elements with one valence electron gain seven electrons in order to meet the octet rule.
Chemistry
2 answers:
Zepler [3.9K]3 years ago
7 0

Answer:

C. Atoms of elements with five to seven valence electrons form anions in order to meet the octet rule.

Explanation:

  • Atoms of elements gain or lose electron(s) to obey the octet rule by forming cations or anions.
  • Atoms with 1 to 3 valence electrons lose electrons to form cations in order to attain a stable configuration.
  • Atoms with 5 to 7 valence electrons gain electron(s) to form anions in order to attain stable configuration.
  • However, atoms with 8 valence electrons do not require to gain or lose electrons since they an octet configuration.
  • Atoms of metallic elements such as those in group 1 and 2 lose electron(s) to form cations while atoms of non-metallic elements such as halogens require to gain electron(s) to form anions so as to obey the octet rule.
Inessa [10]3 years ago
6 0

Answer:

The correct statement is option C.

Explanation:

Octet rule: In a chemical bond each atom tends to have 8 electrons in their valence shell.

  • Atoms with one to three valence electrons in their valence shell tends to loose their electron to form a cation in order to meet octet rule.
  • Atoms with five to seven valence electrons in their valence shell tends to gain electron to form an anion in order to meet octet rule.

So, for atom with one valence electron gaining 7 electron more will be difficult. but is can easily loose its 1 electron to form a cation.

The correct statement comes out to be:

Atoms of elements with five to seven valence electrons form anions in order to meet the octet rule.

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Burka [1]

Answer:

B. A precipitate will form since Q > Ksp for calcium oxalate

Explanation:

Ksp of CaC₂O₄ is:

CaC₂O₄(s) ⇄ Ca²⁺ + C₂O₄²⁻

Where Ksp is defined as the product of concentrations of Ca²⁺ and C₂O₄²⁻ in equilibrium:

Ksp = [Ca²⁺][C₂O₄²⁻] = 2.27x10⁻⁹

In the solution, the concentration of calcium ion is 3.5x10⁻⁴M and concentration of oxalate ion is 2.33x10⁻⁴M.

Replacing in Ksp formula:

[3.5x10⁻⁴M][2.33x10⁻⁴M] = 8.155x10⁻⁸. This value is reaction quotient, Q.

If Q is higher than Ksp, the ions will produce the precipitate CaC₂O₄ until [Ca²⁺][C₂O₄²⁻] = Ksp.

Thus, right answer is:

<em>B. A precipitate will form since Q > Ksp for calcium oxalate</em>

<em></em>

4 0
3 years ago
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Answer:

<u>Yes</u>

Explanation:

Remember, <u>Newton's third law of motion;</u> which says in part that <em>"Every action has an equal and opposite reaction."</em>

Hence, in this case, the fact that the doorbell rang out implies that there was another force that was exerted on it; which is, John's finger pressing the doorbell.

In other words, when John uses his fingers to press the doorbell button he applies a force (a mechanical force), and that force results in an opposite reaction; the ringing of the doorbell.

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Explanation:

here u go :P

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