PLS help!!!!!!!!

Why are halogen atoms never a central atom?

Answers

Answer 1
They can’t have more than 8 valence electrons. Since fluorine is in group 7 it can only bound to one other molecule
Answer 2

Answer:

They can’t have more than 8 valence electrons.

Explanation:


Related Questions

formal charge of hcooh​

Answers

Answer:

What is the question?

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below. Which of these elements is in this group?
Characteristics of a group of elements
•is shiny
•is solid at room temperature
•has atoms with two valence electrons
A-silicone
B-lithium
C-strontium
D-aluminum

Answers

Answer:

C:Strontium

Explanation:

Strontium because all the characteristics you described are apart of the alkaline earth metals and strontium is apart of that group.

What type of bond would be expected between Mg and Ti?
A.hydrogen bond
Bionic bond
C.covalent bond
D.metallic bond

Answers

C. covalent bond.... hope this helps!


If the hydronium ion concentration of a substance is 1.0 X 10-6 M, what would be the pH of that substance??
Show/Describe your work.

Answers

Fam fam fam fam fam just trust bruh I did the work

Why do gases diffuse more quickly than liquids?

Choose the correct answer.

A) Liquids can be compressed easily.

B)The particles in gases are not mobile.

C)Liquids are always at lower temperatures than gases.

D)Gas particles move rapidly and have space between them.

Answers

Answer:

D)Gas particles move rapidly and have space between them.

Explanation:

Matter exists in three states namely: solids, liquids and gases. The particles contained in these three states are different from one another. In the gaseous state, the particles are FAR APART from one another i.e. space exists and they move at a very fast rate in contrast to the particles of a liquid, which have less space and move slower.

This rapid movement of gas particles within a less restricted space accounts for the reason why gaseous substances DIFFUSE more quickly than liquids.

What total volume of ozone measured at a pressure of 24.5 mmHg and a temperature of 232 K can be destroyed when all of the chlorine from 15.5 g of CF3Cl goes through 10 cycles of these reactions

Answers

Answer:

[tex]1.75272\ \text{m}^3[/tex]

Explanation:

The breakdown reaction of ozone is as follows

[tex]CF_3Cl + UV \rightarrow CF_3 + Cl[/tex]

[tex]Cl + O_3 \rightarrow ClO + O_2[/tex]

[tex]O_3 + UV \rightarrow O_2 + O[/tex]

[tex]ClO + O \rightarrow Cl + O_2[/tex]

It can be seen that 2 moles of ozone is required in the complete cycle

So for 10 cycles, 20 moles of ozone is required

m = Mass of [tex]CF_3Cl[/tex] = 15.5 g

M = Molar mass of [tex]CF_3Cl[/tex] = 104.46 g/mol

P = Pressure = 24.5 mmHg

T = Temperature = 232 K

R = Gas constant = [tex]62.363\ \text{L mmHg/K mol}[/tex]

Number of moles is given by

[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{15.5}{104.46}\\\Rightarrow n=0.1484\ \text{moles}[/tex]

[tex]20\ \text{moles} = 20\times 0.1484 = 2.968\ \text{moles}[/tex]

From ideal gas law we have

[tex]PV=nRT\\\Rightarrow V=\dfrac{nRT}{P}\\\Rightarrow V=\dfrac{2.968\times 62.363\times 232}{24.5}\\\Rightarrow V=1752.72\ \text{L}=1.75272\ \text{m}^3[/tex]

For 20 cycles of the reaction the volume of the ozone is [tex]1.75272\ \text{m}^3[/tex].

The Total volume of Ozone measured is =  1.7527 m³

Given data :

Mass  of  CF₃Cl = 15.5 g

Molar mass  of  CF₃Cl  = 104.46 g/mol

Pressure ( P ) = 24.5 mmHg

T = 232 K

Gas constant ( R ) = 62.363 L mmHg/K mol

Note : For a complete ozone cycle 2 moles of ozone is required therefore for 10 cycles 20 moles of ozone will be required

First step : Determine number of moles in each cycle reaction

n = m / M  ----- ( 1 )

m = mass = 15.5 g

M = molar mass = 104.46 g/mol

∴ n = 15.5 / 104.46 = 0.1484

Hence the number of moles in 10 cycle = 20 * 0.1484 = 2.968 moles

Next step : Apply Ideal gas law to determine the volume of Ozone

PV = nRT  ----- ( 2 )

n = 2.968

V = ?

R = 62.363 L mmHg/K mol

T = 232 K

P = 24.5 mmHg

V = nRT / P --- ( 3 )

      = ( 2.968 * 62.363 * 232 ) / 24.5

      = 1752.72 L ≈ 1.7527 m³

Hence we can conclude that the Total volume of Ozone measured is =  1.7527 m³

Learn more : https://brainly.com/question/20335707


Which of the following is not made up of atoms?
A. elements
B. molecules
C.
pure substances
D. subatomic particles

Answers

I think the answer is D

The sub-atomic particles are not made up of atoms, they have their own identity.

What are sub-atomic  particles?

Sub -atomic particles are defined as particles which compose an atom. A sub -atomic particle can be a composite particle composed of other particles or an elementary particle  which is not composed of other particles.

The elementary particles are six flavors of quarks , six types of leptons and twelve gauge Bosons .All sub atomic particles have an electric charge  which is an integer multiple of elementary charge.They are in smaller in size as  compared to atoms.

The three fundamental sub-atomic particles are electrons , protons and neutrons . The smallest known sub-atomic particles to exist are called quarks. Neutrons and protons are the sub-atomic particles which reside in the nucleus and are together called as nucleons.

Learn more about sub-atomic particles,here:

https://brainly.com/question/11694375

#SPJ2

25. Which of the following statements concerning atomic structure is/are correct?
1. The nucleus contains most of an atom's mass.
2. The nucleus contains all the positive charge of an atom.
3. Electrons surround the nucleus and account for the majority of an atom's volume.
1 only
2 only
3 only
2 and 3
1, 2, and 3

Answers

Answer:

It would be 2 and 3

The image shows the structure of an atom, I hope it helps :)

To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option 2,3.

What is atom?

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. The nucleus contains all the positive charge of an atom. Electrons surround the nucleus and account for the majority of an atom's volume.

Therefore, the correct option is option 2,3.

To know more about atom, here:

https://brainly.com/question/13518322

#SPJ2

What volume. In liters, of H2O(g) measured at STP is produced by the combustion of 15.63 g of natural gas (CH4) according to the following equation? CHale) +20269) CO2 + 2H2008)

Answers

Answer:

V = 43.95 L

Explanation:

Given data:

Mass of CH₄ decomposed = 15.63 g

Volume of H₂O produced at STP = ?

Solution:

Chemical equation:

CH₄ + 2O₂    →       2H₂O  + CO₂

Number of moles of CH₄:

Number of moles = mass/molar mass

Number of moles = 15.63 g/ 16 g/mol

Number of moles = 0.98 mol

Now we will compare the moles of H₂O with CH₄.

                         CH₄              :              H₂O

                           1                 :                2

                        0.98             :            2×0.98 = 1.96 mol

Volume of hydrogen:

PV = nRT

1 atm × V = 1.96 mol × 0.0821 atm.L/mol.K × 273.15 K

V = 43.95atm.L / 1atm

V = 43.95 L

A beverage manufacturer wants to increase The solunility of carbon dioxide in its carbonated drinks as beverages produced which action will increase the solubility of CO2 gas the most

A. Decreasing the pressure on it
B. Increasing stirring
C. Decreasing its temperature
D. Increasing its temperature

Answers

Answer: C

Explanation:

When a material gains thermal energy and melts, it is undergoing a physical change.

Answers

Answer:

True, it undergoes a physical change.

Explanation:

A physical change is a change that does not change the chemical makeup of a material. This includes altering its shape.

At which temperature can water contain the most
dissolved sugar?

Answers

Answer:

At 10ºC or 50ºF water can cotain the most dissolved sugar.

true or false???????????

Answers

Answer:

false

Explanation:

longer the wave length less frequency

TRUE OR FALSE? Alloys are used more than pure metals because they are generally softer and less likely to react with air or water.

Answers

Alloys are used much more than pure metals because they are generally stronger and less likely to react with air or water...

So I would say false

What is the formula mass for (NH4)2C2O4

Answers

Answer:

124.1 g/mol

Explanation:

just facts

Answer:

124.1 g/mol

Explanation:

To calculate formula mass, multiply the subscript of each element in the formula by the element's atomic weight (relative atomic mass) found on the periodic table. The unit for formula mass is either u or Da (Daltons).

All the following are physical properties of metals EXCEPT
a. malleability
c. conductivity
b. brittleness
d. ductility

Answers

Explanation:I think it's option b) brittleness

I hope this might help u

1 point
Which element requires the least amount of energy to remove its valence electron(s)?

barium
chlorine
oxygen
carbon

Answers

With an electronegativity of 0.89, Barium requires the least amount of energy to remove its valence electrons.

What element has 2 occupied principals of energy levels

Answers

helium i believe is the answer

what elements make up duralumin( an alloy)?​

Answers

Answer:

In addition to aluminium, the main materials in duralumin are copper, manganese and magnesium.

Answer:

The original composition has been varied for particular applications; it may contain about 4 percent copper, 0.5–1 percent manganese, 0.5–1.5 percent magnesium, and, in some formulations, some silicon.

Which energy transformation produces electricity and is least likely to negatively impact the environment?

Generating electricity from a natural gas-fired power plant
Generating electricity from a natural gas-fired power plant

Generating electricity from a coal-fired power plant
Generating electricity from a coal-fired power plant

Generating electricity from a nuclear power plant
Generating electricity from a nuclear power plant

Generating electricity from a solar panel system
Generating electricity from a solar panel system

Answers

electricity from solar panels

Explanation:

All other options produce something after or during the time electricity is made. That something is gas. Not solar

What does the group number plus number of bonds equal?

It’s talking about the periodic table

Answers

Answer:

A stable compound with a complete octet or electronic configuration

Explanation:

The Periodic table is the arrangements of chemical elements in horizontal rows (called 'Periods') and vertical columns (called 'Groups') based on their various physical and chemical properties.

Elements in the same group have a common quality being that they have the same number of free (valent) electrons in their outermost shell. For example, elements in group 1 all have one valent electron in the outermost shell as compared to elements in group 5 which have five valent electrons in the outermost shell. Therefore the group number tells us the number of valence electrons of all the elements in that group.

Meanwhile, elements in the same period have the same number of outermost shell but an increasing number of valence electrons as one goes across the period from left to right.

Elements form chemical bonds in an effort to achieve chemical stability. Chemical stability is achieved when the shells of the elements are fully filled with electrons and achieved a stable electronic configuration of 2 or 8.

The type of bonds formed depend on the number of valence electrons available for bonding in the outermost shell of the element.

So the element Oxygen for example which has 6 valence electrons, in its outermost shell tends to form covalent bonds (a bond achieved by sharing electrons). It is easier for oxygen to form a covalent bond by sharing its valence electrons with another element than to lose all six valence electrons in order to achieve a stable octet state  

The element Chlorine (Cl, with seven valence electrons) on the other hand tends to form electrovalent or ionic bonds by accepting an electron from a metal element like Sodium (Na) to achieve a complete octet. It is easier for Cl to achieve a stable octet state by accepting an electron than losing all 7 valence electrons.

Therefore, the group number (an indicator of the number of valence electrons in the outermost shell) plus the number of bonds formed equals a stable atom or compound with a complete electronic configuration.

What is the specific rotation of a sample of carvone that is an equal mixture of the R and S enantiomers

Answers

Answer:

Zero

Explanation:

An an equal mixture of the R and S enantiomers of carvone is called a racemic mixture.

In a racemic mixture, the R enantiomer rotates plane polarized light in one direction while the S enantiomer rotates plane polarized light in another direction.

This cancels out the rotation due to each enantiomer since they are equal in magnitude but opposite in direction leading to a specific rotation of zero for the racemic mixture.

PLEASE HELP IM TIMED

Which of the following is not an oxidation-reduction reaction?
Upper X e upper F subscript 6 (s) right arrow upper X e upper F subscript 4 (s) plus upper F subscript 2 (g).
2 upper C s (s) plus upper I subscript 2 (g) right arrow 2 upper C s upper I (s).
2 upper H subscript 2 upper S upper O subscript 4 (a q) plus 2 upper B a (upper O upper H) subscript 2 (a q) right arrow 2 upper B a upper S upper O subscript 4 upper H subscript 2 upper O (l).
Upper Z n (s) lus 2 upper A g upper N upper O subscript 3 (a q) right arrow upper Z n (upper N upper O subscript 3) subscript 2 (a q) plus upper A g (s).

Answers

Answer: choice 2

Explanation:

9.Ammonium nitrate (NH4NO3) can decompose to form gaseous water, nitrogen, and oxygen. What is the sum of the coefficients in the balanced chemical equation

Answers

Answer:

the sum of the coefficients in the balanced chemical equation is 9

Explanation:

The computation of the sum of the coefficients in the balanced chemical equation is shown below:

here is the balanced chemical equation

[tex]2NH_4NO_3 \rightarrow 4H_2O)g) + 2N_2(g) + 1O_2(g)[/tex]

Now the sum is

= 2 + 4 + 2 + 1

= 9

hence, the sum of the coefficients in the balanced chemical equation is 9

and, the same is to be considered

A scientist who collects and analyzes DNA from a crime scene is a

Answers

Answer:

forensic scientist

Explanation:

forensic science is the discipline in which professionals use scientific means to analyze physical crime evidence. this evidence is then presented in court in order to help determine the innocence or guilt of a specific suspect.

Answer:

Its a forensic scientist :D

Explanation:

I took a test and got it wrong but it showed the right answer and its a forensic scientist

(don't ask how i got it wrong i was rushing!!)

20 POINTS
What is true about the Sun, light bulbs, and flames?

AThey are all made of fire.
BThey are all made by people.
CThey are all found in nature.
DThey are all sources of light energy.

Answers

Answer:

D

Explanation:

Light blubs are not made of fire.

The sun wasnt made by humans.

You cant find Light bulbs in nature.

Meaning it is D.

Calculate the number of atoms present in .20 moles of H20.

Answers

Answer:

20 moles = (96.7+)

345%20 moles inter = h20

h2+345%20 moles

kalkadanc = jani+CARSORI

564 MOLES

Explanation

we have to plus the moles that we can get the answer and u should now the formula of kalkadanc and just % will get to the correct answer.

i think u may understand and this is the correct answer i had practice this too much

PLEASE HELP ME! I am confused on this.

Answers

Answer:

Mohammed has less kinetic energy

Explanation:

m=Kg

V= m/s

KE= kinetic energy = J

the way you work out the answer is:

KE = 1/2 × m × v squared

Order the relative rate of diffusion of the following gases from slowest to fastest

Answers

Answer:

Kr, Ar, Ne, N

Explanation:

Hope this helps

all energy travels in waves true or false

Answers

True energy does travel in waves .
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