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3 years ago

Which of the elements has the same Lewis dot structure as calcium (Ca)?

Chemistry

2 answers:

Vlad1618 [11]3 years ago

6 0

Answer:

$\boxed {\boxed {\sf A. \ Barium (Ba)}}$

Explanation:

Lewis dot structures illustrate the valence electrons in an element.

Valence electrons are the outermost electrons in an atom that bond with other atoms by accepting or releasing electrons.

The groups, or columns, of the Periodic Table have the same number of valence electrons.

Calcium is in group 2.

The other elements in this group are:

Beryllium, Magnesium, Strontium, Barium, and Radium

So, all these elements have the same lewis dot structures because they have the same number of valence electrons.

Based on the answer choices, choice A is correct.

cricket20 [7]3 years ago

3 0

It’s gonna be which ever element(s) that has the same number of valence electrons!!

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Consider the following reaction where Kc = 1.29×10-2 at 600 K: COCl2 (g) CO (g) + Cl2 (g) A reaction mixture was found to contai

vaieri [72.5K]

Answer:

1. In order to reach equilibrium COCl₂(g) must be consumed.

B. False

2. In order to reach equilibrium Kc must increase.

B. False .

3. In order to reach equilibrium CO must be consumed.

A. True.

4. Qc is greater than Kc.

A. True

5. The reaction is at equilibrium. No further reaction will occur.

B. False.

Explanation:

Based on the reaction:

COCl₂(g) → CO (g) + Cl₂(g)

And Kc is defined as:

Kc = 1.29x10⁻² = [CO] [Cl₂] / [COCl₂]

Molar concentrations of each species are:

[COCl₂] = 0.104 moles of COCl₂ / 1L = 0.104M

[CO] = 4.66×10⁻² moles of CO / 1L = 4.66×10⁻²M

[Cl₂] = 3.76×10⁻² moles of Cl₂ / 1L = 3.76×10⁻²M

Replacing in Kc formula:

4.66×10⁻²M × 3.76×10⁻²M / 0.104M = 1.68x10⁻²

As the concentrations are not in equilibrium, 1.68x10⁻² is defined as the reaction quotient, Qc.

As Qc > Kc, the reaction will shift to the left producing more COCl₂ and consuming CO and Cl₂. Thus

1. In order to reach equilibrium COCl₂(g) must be consumed.

B. False

2. In order to reach equilibrium Kc must increase.

B. False . Kc is a constant that never change.

3. In order to reach equilibrium CO must be consumed.

A. True.

4. Qc is greater than Kc.

A. True

5. The reaction is at equilibrium. No further reaction will occur.

B. False. The reaction is in equilibrium when Qc = Kc

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4 years ago

When electrons move through a series of electron acceptor molecules in cellular respiration ________.

Verizon [17]

Answer:

oxygen is reduced to form water.

Explanation:

Cellular respiration

It is the set of reactions in which the ac. Pyruvic produced by glycolysis is split into CO2 and H2O and 36 ATP are produced. In eukaryotic cells breathing is performed in the mitochondria. It occurs in two stages:

- PIRUVATE OXIDATION

- AC CYCLE TRICARBOXYL

The "problem" with fermentation is that, by using organic molecules as terminal electron acceptors and having to dispose of the resulting product (lactic acid / ethanol) as waste, the potential energy of these compounds is lost.

The alternative solution is to use some non-organic molecule that can accept electrons and thus become a reduced molecule. Oxygen is perfect for this, because after receiving the electrons it combines with two protons, thus becoming the perfect liquid residue for the environment: H2O.

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3 years ago

Carbon-14 has a half-life of 5730 years. How old would a real fossil be after 4 carbon-14 half-lives? Show work

Liono4ka [1.6K]

Answer: 22920 years

Explanation:

Every 5730, the carbon-14 is halved.

After 4 of such cycles, meaning 5730 * 4 = 22920 years

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3 years ago

What is type of compound of FeO?

Ivahew [28]

Answer:

Ferrous Oxide, FeO is an inorganic compound.

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3 years ago

Calculate the molarity of a solution containing 21.9g of MgCl, in enough water to

Monica [59]

Find moles of MgCl first by dividing by the molar mass.

21.9 g / 95.211 g/mol = 0.230 mol MgCl

Then divide by L of water to get the molarity.

0.230 mol / 0.750 L = 0.307 M MgCl

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3 years ago