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Alexandra [31]
3 years ago
12

When drawing the Lewis structure of a molecule, start by determining the total number of available valence based on each element

's ____________ Then, use the total number of electrons needed for each element to be stable, generally based on __________ to determine the _____________ by finding the difference between the number of needed and available electrons divided by two. Next, identify the central atom, which is the element with the ______________ other than hydrogen. Finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element.
Chemistry
1 answer:
grandymaker [24]3 years ago
3 0

Answer:

group number

the octet rule

total number of bonds

fewest valence electrons

Explanation:

When drawing the Lewis structure of a molecule, start by determining the total number of available valence based on each element's <u>group number </u>Then, use the total number of electrons needed for each element to be stable, generally based on <u>the octet rule</u> to determine the <u>total number of bonds</u> by finding the difference between the number of needed and available electrons divided by two. Next, identify the central atom, which is the element with the <u>fewest valence electrons</u> other than hydrogen. Finally, arrange the number of bonds around the central atom to fulfill the stable number of electrons for each element.

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The first step in the process used to recover zinc metal from zinc sulfide ore is the reaction of zinc sulfide with oxygen gas t
Vikentia [17]

Answer : The mass of oxygen consumed in the reaction is 14.6 grams.

Explanation :

First we have to calculate the change in moles of oxygen.

Formula used :

w=\Delta nRT

or,

\Delta n=\frac{w}{RT}

where,

w = work done = 850.1 J

\Delta n = change in moles of gas = ?

R = gas constant = 8.314 J/mol.K

T = temperature = 675 K

Now put all the given values in the above formula, we get:

\Delta n=\frac{850.1J}{(8.314J/mol.K)\times (675K)}=0.152mol

Now we have to calculate the mass of oxygen consumed.

The balanced chemical reaction is,

2ZnS(s)+3O_2(g)\rightarrow 2ZnO(s)+2SO_2(g)

Here, the volume changes of solids can be ignored.

From the balanced chemical reaction, we conclude that

The number of moles oxygen required for the complete reaction = 3

Change in mole of oxygen = 0.152 mol

Molar mass of O_2 = 32 g/mol

So,

The mass of oxygen consumed = 3 x 0.152 mol x 32 g/mol = 14.6 g

Therefore, the mass of oxygen consumed in the reaction is 14.6 grams.

4 0
3 years ago
Which of the following statements are TRUE?I. Models are always wrong unless they are proved by a theoryII. Elements, such as le
BartSMP [9]

Answer:

II and IV.

Explanation:

I. (INCORRECT). A model is a tentative to determinate a thing that can't be proved, and it's made based on evidence. If the model can explain the observation in nature, it is considered right, although it can be proved by a theory.

II. (CORRECT). The most accepted model of atoms says that they're formed by tiny particles, protons, neutrons, and electrons, with the first two on the nucleus, and the other surrounding it in an open space.

III. (INCORRECT). A heterogeneous mixture is a mixture of substances that is possible to identify phases of them, such as in oil and water. In the air, isn't possible to identify the constituents, and it's a homogeneous mixture.

IV. (CORRECT). Silver has atomic number 47, which is its number of protons. The atomic mass is the sum of protons and neutrons, so the number of neutrons is 108 - 47 = 61.

5 0
4 years ago
Why does a year consist of 365 days and a day of 24 hours?
poizon [28]
<span>A year, 365 days, is the time it takes for the Earth to travel around the Sun. A day, 24 hours, is the time it takes for the Earth to spin around once on its axis.</span>
5 0
4 years ago
Read 2 more answers
Use the dichotomous key below to identify the cell type.
xenn [34]

The dichotomous key is not given here, however, the correct dichotomous key is as follows:

step- 1a cell has a nucleus and organelles - go to step 2

        1b cell has no nucleus or organelles - bacterial cell

step- 2a cell has a cell wall - go to step 3

         2b cell has no cell wall - animal cell

step-  3a cell has chloroplasts - plant cell

3b cell has no chloroplasts - fungal cell

Using this dichotomous key the cell can be identified as - Fungal cell.

A dichotomous key is an essential scientific tool that is used to find out the various kinds of organisms on their observable traits. Dichotomous keys have a series of statements with two different choices in each step that will take the student or user to the correct identification.

Identification of the given cell:

1. Follow step 1.

  • If cells have a nucleus and organelles - yes then go to step 2

2. follow step 2.

  • 2a. if cell has a cell wall - yes go to step 3

3. follow step 3.

  • 3a. if cell has chloroplasts - no then fungal cell

Fungal cells have a nucleus and cell organelles enclosed with a cell wall around the plasma membrane but do not have chloroplast.

Thus, Using this dichotomous key the cell can be identified as - Fungal cell.

Learn more about fungal cells:

brainly.com/question/14470940

6 0
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In the electrolysis of molten lead bromide, what is the product at the anode?
Kisachek [45]

Answer:

it is the second one. Lead

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