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lidiya [134]
3 years ago
11

Which of the following statements is false about drawing Lewis structures?

Chemistry
1 answer:
zhannawk [14.2K]3 years ago
8 0

Answer:

c. N, P, and As can sometimes share more than 8 e-

Explanation:

Lewis structures are diagrams that show the valence electrons of atoms within a molecule. Valence electrons play a major role while drawing Lewis structures as only valence electrons can be shared with another molecule to form a bond.

N, P, and As can not share more than 8 e- because they have less valence electrons in their outer shell. N has only one valence electron, P and As has only 5 valence electrons so they can not share more than their valence electrons.

Hence, the correct answer is "c. N, P, and As can sometimes share more than 8 e-".

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Fill in the blanks. People can identify the _____ of an element by looking at its _____ on the periodic table
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Molecule, formulaaaaaaaaaa
7 0
3 years ago
Type the correct answer in each box balance the equation
kramer

Answer:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

Explanation:

This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.

According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

8 0
2 years ago
According to the law of conservation of energy, the total amount of energy in the universe is Question 24 options: increasing de
GalinKa [24]
<h3><u>Answer;</u></h3>

Constant

<h3><u>Explanation;</u></h3>
  • According to the law of conservation of energy, the total amount of energy in the universe is constant.
  • The law of Conservation of Energy states that Energy cannot be created or destroyed. The total amount of energy in the universe never changes, although it may change from one form to another.
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7 0
3 years ago
A buffer solution contains 0.486 M NaHCO3 and 0.345 M Na2CO3. If 0.0321 moles of sodium hydroxide are added to 150 mL of this bu
Molodets [167]

Answer:

pH = 10.51

Explanation:

The buffer of HCO₃⁻ + CO₃²⁻ has a pka of 10.2

HCO₃⁻ ⇄ H⁺ + CO₃²⁻

0,150L of these substances are:

0,150L × 0,486M NaHCO₃ = <em>0.0729mol NaHCO₃</em>

0,150L × 0,345M Na₂CO₃ = <em>0.05175mol Na₂CO₃</em>

NaOH reacts with HCO₃⁻ producing CO₃²⁻, thus:

NaOH + HCO₃⁻ → CO₃²⁻ + H₂O + Na⁺

0.0321 moles of NaOH produce the same moles of CO₃²⁻ and consume HCO₃⁻. Moles of these species are:

CO₃²⁻: 0.05175mol + 0.0321mol: <em>0.08385mol</em>

HCO₃⁻: 0.0729mol - 0.0321 mol: <em>0.0408mol</em>

<em />

Using Henderson-Hasselbalch formula:

pH = pka + log [Base] / [Acid]

pH = 10.2 + log 0.08385mol / 0.0408mol

<em>pH = 10.51</em>

<em />

I hope it helps!

7 0
3 years ago
Water provides the ....................... for many plants and animals.
stepan [7]

Answer:

I would say the living for many plants and animals

8 0
2 years ago
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