Which Of The Following Is Not True?Which Of The Following Statements Is True?

The expected dominant Lewis structure for the CF₂ molecule is the one represented by the third option: F--C--FO.

To determine the dominant Lewis structure, we need to consider the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight valence electrons. In the Lewis structure, F--C--FO, each atom has an octet of electrons, with the carbon atom having a full octet and the fluorine and oxygen atoms each having eight electrons.

Let's analyze the other options:

1. F--C--FO: In this structure, the carbon atom has a full octet, but the fluorine atom only has six electrons. Therefore, this structure does not satisfy the octet rule.

2. F--C--FO: This structure is the same as the first option, with the fluorine atom having only six electrons. Hence, it also does not follow the octet rule.

4. F==C--F: In this structure, the carbon atom has a full octet, but each fluorine atom only has six electrons. Similar to the first two options, this structure does not fulfill the octet rule.

Therefore, the Lewis structure F--C--FO is expected to be the dominant structure for the CF₂ molecule since it is the only one that satisfies the octet rule for all atoms involved.

You can learn more about Lewis's structure at: brainly.com/question/4144781

#SPJ11

Based on the hypotheses discussed in Chapter 12 regarding melting points and the forces that hold materials together, we can make a prediction about the forces holding atoms of cesium and lithium together in their solid metal forms.

One hypothesis suggests that stronger forces between atoms result in higher melting points. Another hypothesis proposes that metals are held together by metallic bonds, where positively charged metal ions are surrounded by a sea of delocalized electrons.

Considering these hypotheses, we can infer that cesium atoms would be held together by stronger forces compared to lithium atoms in their solid metal forms. This is because cesium is located further down the periodic table, belonging to Group 1 (alkali metals), whereas lithium is in Group 2 (alkaline earth metals). As we move down a group in the periodic table, the atomic radius generally increases, leading to weaker forces of attraction between atoms.

Therefore, the larger atomic size of cesium compared to lithium would result in weaker interatomic forces, making cesium's solid metal form have a lower melting point compared to lithium.

To know more about cesium, follow the link:

https://brainly.com/question/28655027

#SPJ4

Answer:

Explanation:

2C2H5OH + 6O2 -----> 4CO2+ 6H2O

Esa es la reacción equilibrada

The quantity of sulfuric acid may not be used because sulfuric acid is excessive and aluminum is limiting.

Limiting reactants in reactions are reactants that are present in lower stoichiometric quantities in comparison with other reactants.

Thus, limited reactants determine how far the reaction can go in terms of producing products.

Thus, the percent yield of alum might have been calculated based on the starting quantity of aluminum because the latter is the limiting reactant of the reaction.

More on limiting reactants can be found here: https://brainly.com/question/14225536

#SPJ1

The oxygen that is released during the light reactions comes from water.

Let's know more about photosynthesis:

1. Photosynthesis is the process by which the plant can produce food. The process of photosynthesis converts light energy into chemical energy, which organisms can use. In this process, water and carbon dioxide produce oxygen and glucose. This process is carried out in the chloroplasts of plants.

2. Light Reaction: During the process of photosynthesis, two types of reactions take place, light reaction, and dark reaction. The light reaction takes place in the thylakoid membrane of the chloroplast. It needs light to occur. Here, the light energy is absorbed by pigments such as chlorophyll. This light energy is converted into chemical energy. ATP and NADPH are the two products of the light reaction.

3. Oxygen is also released during the light reaction. The oxygen that is released during the light reactions comes from water. This reaction also helps in the formation of the electron transport chain.

#SPJ11

Know more about light reactions: What is a light reaction?​ https://brainly.com/question/23940213

a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

To learn more about temperature, https://brainly.com/question/16999043

#SPJ11

Answer: Physical properties, but not in its identity

Explanation:

Physical changes only change the substances physical properties, not the substance’s identity

Answer:C) S, Cl, F shows the decreasing order of atomic radii across a period and down a group

Explanation:

The Trend of  atomic radius in a period occurs like this :

decreases from left to right as you go across a period. This is because of the shrinking of the nucleus  as electrons are being added to the same orbital or shell conferring on the nucleus a positive charge as  protons are also  being  added to the nucleus causing an attraction of the positively charged nucleus to electrons.

Increase down the group-This is because of the increasing energy levels caused by an increase in the number of shell causing a gap between outermost shell and the nucleus.

--Therefore  On the same group, as you move across the period 3, Sulphur has a larger atomic radius than chlorine  and on group 17  chlorine has a larger atomic radius than Fluorine.

Answer:

CaC2 + 2H2O → C2H2 + Ca(OH)2

thats it

Explanation:

The oxidation number is often referred to as the oxidation state.

The number of electron/electrons which completely transferred and induced charged on an atom is called oxidation state of an atom. It is also describe as the number that is allocated to elements in a chemical combination. The number of electron that atoms in a molecule can share while forming chemical bonds with other atoms of a different elements. The oxidation number of the monoatomic (composed by atom) ion is the same as the charge of the ion.

The primary distinction between oxidation number versus oxidation state would be that the former refers to the charge that would be placed on the central atom of a coordination complex if every one of the connections around it were ionic bonds, while the latter relates to the number of electrons that an atom could either receive, lose, or share with some other atom.

learn about oxidation number

https://brainly.com/question/15167411

#SPJ4

Answer:

wait what?

Explanation:

brainliest pls

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Answer:

i believe it is covalent

Explanation:

The energy that is released for the breaking of bonds is 229 kJ/mol.

We should be able to recall that the enthalpy of the reaction taken to be the energy that is evolved or absorbed in the reaction that is ongoing. We have to note that in the course of the reaction there would be the breaking and the making of bonds.

Now we know that;

The bond energy can be given as;

Sum energy of the broken bonds of reactants  - Sum of the energy of the formed bonds

Hence;

(945 + 498) - 2(607)

1443 - 1214

= 229 kJ/mol

Learn more about enthalpy:https://brainly.com/question/13996238

#SPJ1

One mole of an ideal monatomic gas initially at 300 K and a pressure of 15 atm expands to a final pressure of 1 atm. The expansion can occur via any one of four different paths: 1. isothermal and reversible, 2. isothermal and irreversible, 3. adiabatic reversible, and 4. adiabatic irreversible.

In irreversible processes, the expansion occurs against an external pressure of 1 atm. For each case, we can calculate the values of q, w, ΔU, and ΔH using the following equations:

1. Isothermal and reversible:
q = -w = nRTln(V2/V1)
ΔU = 0 (since the temperature is constant)
ΔH = 0 (since the enthalpy is a function of temperature)

2. Isothermal and irreversible:
q = -w = nRTln(V2/V1)
ΔU = 0 (since the temperature is constant)
ΔH = 0 (since the enthalpy is a function of temperature)

3. Adiabatic reversible:
q = 0 (since the process is adiabatic)
w = -nCvΔT = -nCv(T2-T1)
ΔU = nCvΔT = nCv(T2-T1)
ΔH = nCpΔT = nCp(T2-T1)

4. Adiabatic irreversible:
q = 0 (since the process is adiabatic)
w = -PextΔV = -Pext(V2-V1)
ΔU = nCvΔT = nCv(T2-T1)
ΔH = nCpΔT = nCp(T2-T1)

Using these equations, we can plug in the given values for n, R, T1, P1, P2, V1, and V2 to calculate the values of q, w, ΔU, and ΔH for each case. Note that for an ideal monatomic gas, Cv = 3/2R and Cp = 5/2R.

To know more about isothermal click on below link:

https://brainly.com/question/12023162#

#SPJ11

Catalysis is a process in which a substance, called a catalyst, increases the rate of a chemical reaction without being consumed in the reaction.

Homogenous catalysis refers to a type of catalysis in which the catalyst is in the same phase as the reactants, meaning that they are all either in a gas, liquid, or solid state. In this type of catalysis, the catalyst is evenly distributed throughout the reaction mixture, allowing for efficient and effective catalytic reactions.

Heterogeneous catalysis, on the other hand, is a type of catalysis in which the catalyst is in a different phase than the reactants. For example, a solid catalyst can be used to catalyze a reaction in a liquid or gas phase. In this type of catalysis, the reactants must come into contact with the catalyst, typically at the surface of the catalyst, in order for the reaction to occur.

Both homogenous and heterogeneous catalysis are important in many chemical reactions, with each having its own advantages and disadvantages. Homogenous catalysis offers the advantage of being able to catalyze reactions with high selectivity, while heterogeneous catalysis offers the advantage of being able to easily separate the catalyst from the reaction mixture.

Learn more about catalysis : https://brainly.com/question/12507566  

#SPJ11

Answer:

#4: 0.89 mol/L #5: 0.36 mol

Explanation:

#4: Morality is Moles/ Liters

So take 3.2 mols ÷ 3.6 L = 0.8888... since there are 2 sig figs in the question the answer would round to 0.89 mol/L

#5: to find the number of moles needed, you take the mol/L and multiply that by the volume.

0.89 mol/L ×0.400L = 0.356 mols. the liters cancel out. Since 0.89 has the least number of sig figs your final answer should have 2. which it 0.36 mols.

I hope this helps, good luck!

INFORMATION:

We know that:

- sodium and oxygen react to produce Sodium Oxide

-

(A). From eggs -288, from vanilla -576, from salt-3969, from baking soda -4032, from chocolate chips -54, from sugar -528, from brown sugar -192, from butter -72, from flour- 78.

(B). The ingredient that is the limiting reactant is chocolate chips because it yields the minimum amount of cookies.

(C). The maximum amount of cookies made from the new quantity of ingredients is, 4032 from baking soda.

Cookies are sweet baked desserts made from all-purpose flour and butter and sugar.

They are made in many flavors and are very versatile to prepare.

A. Calculation from the new ingredients:

From eggs-

\(\bold{12\;eggs\times\dfrac{ 24\; cookies}{1\;egg}=288\; cookies}\)

From vanilla-

\(\bold{24\times\dfrac{ 24\; cookies}{1}=576\; cookies}\)

From salt-

\(\bold{82\times\dfrac{24\; cookies}{0.5}=3936\; cookies}\)

From baking soda-

\(\bold{84\times\dfrac{ 24\; cookies}{0.5}=3936\; cookies}\)

From chocolate chips-

\(\bold{3\; cups\times\dfrac{ 24\; cookies}{1.33}=4032\; cookies}\)

From sugar-

\(\bold{11\; cups\times\dfrac{ 24\; cookies}{0.5 cup}=54\; cookies}\)

From brown sugar-

\(\bold{4\; cups\times\dfrac{ 24\; cookies}{0.5\; cup}=528\; cookies}\)

From butter-

\(\bold{4\; sticks\times\dfrac{ 24\; cookies}{1.3\; cup}=72\; cookies}\)

From flour-

\(\bold{4\; lb\times\dfrac{ 24\; cookies}{1.2\; cup}=78\; cookies}\)

B.) chocolate chips

C.) baking soda (4032)

Thus, these are the calculations.

Learn more about cookies, here:

https://brainly.com/question/13219686

The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration

To learn more about electron configuration, refer to:

https://brainly.com/question/26084288

#SPJ4

Answer: hydrocarbon

Explanation:

ch4 is an example of hydrocarbon or an compound of carbon and hydrogen. it’s a marsh of gas 「methane or firedamp」

The new concentration of the KCl solution after mixing 1 L new volume is 0.28 M.

Concentration in terms of molarity will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ = molarity of old KCl solution = 1.6 M

V₁ = volume of old KCl solution = 175 mL = 0.175 L

M₂ = molarity of new KCl solution = ?

V₂ = volume of new KCl solution = 1 L

On putting all these values on the above equation, we get

M₂ = (1.6)(0.175) / (1) = 0.28 M

Hence resultant concentration is 0.28 M.

To know more about molarity, visit the below link:

https://brainly.com/question/24305514

The correct set of quantum numbers for an electron in the 3d orbital is:

n = 3, l = 2, m = -2, s = +1/2

Let's break down each quantum number:

The principal quantum number (n) represents the energy level or shell of the electron. In this case, it is 3, indicating that the electron is in the third energy level.

The azimuthal quantum number (l) represents the angular momentum of the electron. It can have values ranging from 0 to (n-1). In this case, it is 2, indicating that the electron is in the d orbital.

The magnetic quantum number (m) represents the orientation of the orbital in three-dimensional space. It can have values ranging from -l to +l. In this case, it is -2, indicating a specific orientation of the d orbital.

The spin quantum number (s) represents the spin state of the electron. It can have values of +1/2 or -1/2, indicating the two possible spin orientations of an electron. In this case, it is +1/2, representing the spin-up orientation.

Therefore, the correct set of quantum numbers for an electron in the 3d orbital is n = 3, l = 2, m = -2, s = +1/2.

The correct question is:

Which of the following sets of quantum numbers is correct for an electron in 3d orbital?

n = 3, l = 2, m = −3, s = + 1/2

n = 3, l = 3, m = +3, s = - 1/2

n = 3, l = 2, m = −2, s = + 1/2

n = 3, l = 2, m = -3, s = - 1/2

To know more about quantum numbers follow the link:

https://brainly.com/question/14288557

#SPJ4

Answer:

Tornadoes form when warm, humid air collides with cold, dry air.

Explanation:

The denser cold air is pushed over the warm air, usually producing thunderstorms. The warm air rises through the colder air, causing an updraft. The updraft will begin to rotate if winds vary sharply in speed or direction.

// have a great day //

Answer:

your question says of the following but their isn't any of the following ):

Explanation:

But other than than that person right up above

Toxicology is the branch which studies about toxic chemicals and their effects.

Toxicology is the branch in science in which the researches and study are done for finding the effect of the toxic  or poisonous elements on plants , animals , human and earth at large.

High levels of lead exposure is dangerous to humans as it can cause permanent disabilities , it is carcinogenic and hence can lead to death.

This is studied in toxicology.

To know more about Toxicology

https://brainly.com/question/5020436

#SPJ1

Answer:4

To find the moles of the gas , we can use the ideal gas law. Which states -

\( \:\:\:\:\:\:\:\:\:\star\longrightarrow \sf \underline{PV=nRT} \\\)

Where:-

As per question, we are given that-

Now that we have all the required values, so we can put them all in the Ideal gas law formula and solve for moles -

\( \:\:\:\:\:\:\:\:\:\star\longrightarrow \sf \underline{PV=nRT} \\\)

\( \:\:\:\:\:\:\:\:\:\longrightarrow \sf 1.55 \times 58 = n \times 0.0821 \times 222\\\)

\( \:\:\:\:\:\:\:\:\:\longrightarrow \sf 89.9 = n \times 18.2262\\\)

\( \:\:\:\:\:\:\:\:\:\longrightarrow \sf n \times 18.2262 =89.9\\\)

\( \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf n = \dfrac{89.9}{18.2262}\\\)

\( \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf n =4.9324......\\\)

\(\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf \underline{n =4.93 \:moles }\\\)

Therefore, 4.93 moles of gas will be occupied 58 L at a pressure of 1.55 atmospheres and a temperature of 222K.

Answer:

4.93 moles

Explanation:

To find how many moles of gas pressure occupy 58 L at a pressure of 1.55 atmospheres and a temperature of 222 K, use the ideal gas law.

\(\boxed{\sf PV=nRT}\)

where:

As we are solving for the number of moles, rearrange the equation to isolate n:

\(\implies \sf n=\dfrac{PV}{RT}\)

Given values:

Substitute the values into the formula and solve for n:

\(\implies \sf n=\dfrac{1.55 \cdot 58}{0.08206 \cdot 222}\)

\(\implies \sf n=\dfrac{89.9}{18.21732}\)

\(\implies \sf n=4.93\;mol\; (3\;s.f.)\)

Therefore, 4.93 moles of gas occupy a volume of 58 L at a pressure of 1.55 atm and a temperature of 222 K.

Assuming that an average middle-aged man weighing 90 kg (200 lb) contains 15% body fat, we can calculate the amount of energy stored as fat in this man in kilojoules.

The energy yield from fat is 37 kj/g, so we can use this value to calculate the amount of energy stored as fat. First, we need to calculate the total amount of fat in the man's body, which is 0.15 x 90 kg = 13.5 kg. Then, we can multiply this value by the energy yield of fat to get the total energy stored as fat, which is 13.5 kg x 37 kj/g = 499.5 kj. Therefore, the amount of energy stored as fat in this man is approximately 499.5 kj.
An average middle-aged man weighing 90 kg contains 15% body fat, which equates to 13.5 kg (90 kg * 0.15) of fat stored in adipose tissue. Assuming that the energy yield from fat is 37 kJ/g, we can calculate the total energy stored in this man's fat. First, convert the 13.5 kg of fat to grams: 13,500 g (13.5 kg * 1000 g/kg). Then, multiply this by the energy yield per gram of fat: 13,500 g * 37 kJ/g = 499,500 kJ. Therefore, this man has approximately 499,500 kilojoules of energy stored as fat.

To know more about weighing visit:

https://brainly.com/question/14577832

#SPJ11