Multiple choice (please help)

Covalent bonds are formed when two or more atoms (often...) share electrons. Better (more stable) than larger formal charges are smaller ones.

The electron geometry is the foundation for hybridization. Observe the VSEPR Table to ascertain the hydridization of a molecule's core atom. How do sp3 orbitals come into being? The combination of one s and three p orbitals results in four sp3 orbitals.

When a molecule's geometry shows how bond pairs and lone pairs are arranged around the central atom as well as the coordination number of the molecule. The lone pairs around the central atom.

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The term 100% shut off means: gas burner and regulator is shut off gas to a pilot and the manifold is shut off.

The 100% shutoff system is the system where where the failure in the flame device system take place and the in both the the pilot valve and the main gas valve are shut off . the complete shut off means that the pilot should shut off for any reason, the gas valve will not allow any gas to flow either that is to the main burner or to the pilot burner thus is means the 100% shutoff system

Thus, the 100% shutoff system means the failure in the flame proving device.

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HCl(aq) + NaOH (aq) ⇒ H2O (l) +NaCl (aq)   [ titration ]

H+ + OH ⇒ H2O (l)

A titration is a method for figuring out all the concentration of the solution by using a solution with known concentration. Until the reaction is finished, the titrant (the known solution) is typically added from the a buret to a known volume of the analyzer (the unknown solution).

A burette, which is basically a long, graduated measurement rod with such a stopcock and a distribution tube at its bottom end, is used to gradually administer a standard solution of titrant reagent, or titrant, to a specified concentration.

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The given atmospheric pressure in different units is equal to:

0.732 atm = 10.75 psi

0.732 atm = 74.2 kPa

0.732 atm = 7.41 ×10⁴ Pa

0.732 atm = 556.32 mmHg

0.732 atm = 21.9 Hg

Atmospheric pressure can be defined as the pressure within the atmosphere of Earth. The standard atmosphere is expressed as a symbol atm and is equal to a unit of pressure 101,325 Pa.

The atm unit can be described as equivalent to the sea-level atmospheric pressure on Earth and is equal to 1 atm.

Given, the 1 atm is equal to = 14.69 psi

Then 0.732 atm will be equal to = 14.69 × 0.732 = 10.75 psi

the 1 atm is equal to = 101.3 kPa  

Then 0.732 atm will be equal to =  101.3 kPa  × 0.732 = 74.2 kPa

the 1 atm is equal to = 1.013×10⁵ Pa

Then 0.732 atm will be equal to =1.013×10⁵ Pa× 0.732 = 7.41 ×10⁴ Pa

1 atm is equal to = 760 mmHg

Then 0.732 atm will be equal to = 760 × 0.732 =  556.32 mmHg

1 atm is equal to = 29.92 Hg

Then 0.732 atm will be equal to = 29.92 × 0.732 = 21.9 Hg

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The yield of aluminum oxide is 47g

What is aluminum ?

Chemical element aluminium (Al), also written aluminium, belongs to the major Group 13 (IIIa, or boron group) of the periodic table. It is a light, silvery white metal. The most common nonferrous metal and the most plentiful metallic element in the crust of the Earth is aluminium.

What is oxygen ?

Chemical elements are substances that only contain one sort of atom, such as oxygen. An oxygen atom contains eight protons in its nucleus, as indicated by its atomic number of 8 and official chemical symbol, O. At room temperature, oxygen is a gas that is flavorless, odorless, and colorless.

We first need to write down a balanced equation for the reaction:

4Al+3O2→2Al2O3

Now, we determine the number of moles of aluminum: 25.0g27.0g/mol=0.93mol

We know that 4 moles of Al react with 3 moles of O2, so the mole ratio is 4:3. This means we need (3/4)*0.93 mol= 0.69 mol of O2. If we multiply this by the molar mass of O2 (32 g/mol), we get 22.2 g of oxygen needed.

We know that for every 4 moles of Al, there will be formed 2 moles of Al2O3, so the mole ratio is 2:1. This means we will get 0.46 moles of Al2O3. Multiply by the molar mass of Al2O3 (102 g/mol), and we get 47 g.

Therefore, the yield of aluminum oxide is 47g.

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The correct option is d) isolated, decrease.

What are fatty acids?

Fatty acids are long chain aliphatic hydrocarbons having carboxylic acids as a functional group. Fatty acids are classified into saturated and unsaturated. And also, important part of biomolecules.

Naturally occurring fatty acids have even number of carbon atoms and unbranched.  Most of the naturally occurring fatty acids are not conjugated so the melting point of fatty acids decreases as number of bonds increases.

The increase in number of double bonds will create kinks, this restricts the molecule to be closed packed hence melting point decreases.

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The enthalpy of reaction for the given reaction is -1172 KJ. The formation enthalpy of oxygen is zero. Option D is correct.

Enthalpy change of a reaction is the change in  heat energy absorbed or released from a reaction. The change in enthalpy of a reaction is the difference of sun of change in enthalpies of the products and sum of change in enthalpies of the reactants.

Here, the reaction enthalpy can be written as:

ΔH(rxn) = [(6 ΔHf (H₂O) + (4 ΔHf (NO)] -  [(4 ΔHf (NH3) + (5 ΔHf (O₂)].

The formation enthalpy of molecular oxygen in its standard state is 0.

Thus, ΔH(rxn) = [(6 × (-286 ) + (4 × 90) kJ/mol ] -  [(4 × (-46 kJ/mol) ]

                       = -1172 kJ.

Therefore, the reaction enthalpy for the given reaction is - 1172 kJ.

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The best way to sum up the cyclist's potential and kinetic energy is to say that as she progresses up the hill, her kinetic energy rises and her potential energy falls.

The object or system is unaffected by external factors like air pressure or altitude. On the other hand, kinetic energy refers to the force of moving particles within a system or an object.

Kinetic energy is the energy a thing has as a result of motion. A force must be applied to an object in order to accelerate it.We have to work hard in order to apply a force. Once the work is finished, energy is transferred to the item, at which point it moves at a new, constant speed.

Potential energy is the energy that an object or system has stored as a result of its placement or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate environment. Potential energy is independent of an object's surroundings.

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A. NH3 & B. SF4 are the two best options. They have polar bonds, which makes them polar molecules.

A polar covalent link is a type of covalent bond where the atoms are attracted to electrons in uneven amounts, resulting in unequal sharing. When two molecules form a polar covalent link, also known as a polar molecule, the electron distribution surrounding a molecule is no more symmetrical.

Despite the lack of hard and fast standards, the general rule is that a bond is termed nonpolar if the gap in electronegativities is smaller than or equal to 0.4, and polar if indeed the difference is greater.

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Answer:

proceed to the right, increasing the formation of product

Answer:

N2O5 + H2O => 2HNO3

Explanation:

N2O5 + H2O => 2HNO3

N = 2

O = 6

H = 2

I hope this helps.

substituted twice.In the arrow, the reactants are on the left and the products are on the right.

The dissolution of the metal in hydrochloric acid results in the production of aluminum chloride and colorless hydrogen gas.Because the finished products do not interact, this reaction cannot be stopped.Hydrochloric acid reacts with metallic aluminum to produce an oxidation-reduction process.

Aluminum chloride (AlCl3) is the product of almost all reactions between hydrochloric acid and aluminum (or its derivatives).Water and organic solvents like nitrobenzene, dichloroethane, and acetone work well to dissolve the salt.

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The sodium concentration in normal saline solution in mM is 154.1 millimoles.

What is molarity?

Molarity (M) is calculated by dividing the volume of the solution (V) in liters by the number of moles of solute (n). Not moles of solute per liter of solvent, but rather moles of solute per liter of solution, is an important distinction to remember when defining molarity.

Molarity = no of moles /volume in liter

[tex]Number of moles = given weight /molecular weight[/tex]

1000 ml = 1 liter

Molarity = (9/58.4)/ 1

=0.1541M = 154.1 mM

Number of moles = 0.1541

= 154.1 millimoles

Therefore, the sodium concentration in normal saline solution in mM is 154.1 millimoles.

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There would be 0.0781 mol of N2 at 0.3 atm pressure and 30 °C.

By multiplying or dividing, one can utilize Avogadro's number to convert between molecules and moles: To convert from moles to molecules, multiply the number of moles by 6.02 x 1023. To convert the amount of molecules to moles, multiply it by 6.02 x 1023.

The molar volume of a gas is 22.414 L/mol at STP, which is defined as 0°C (273.15 K, 32°F) and 1 atm.

Calculate the moles of nitrogen in 1.75 L at STP using dimensional analysis.

1.75 L N2 divided by 1 mole per 22.414 L equals 0.0781 mol N2 to three 2 digits.

6.02214076 x 1023 of any chemical unit, such as atoms, molecules, ions, and others, constitute a mole. The mole is a useful measure to employ because any substance is made up of a lot of atoms, molecules, or other parts.

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The osmotic pressure of a 0.431 M solution of sodium phosphate in water is equal to 44.25 atm.

The osmotic pressure of a solution can be defined as the minimum pressure that needs to be applied to a solution to prevent the flow of the solvent across a semipermeable membrane. The determination of the tendency of a solution to take in a solvent by osmosis is called osmotic pressure.

To determine the osmotic pressure of the solution the concentration of the compound can be determined.

π = i × CRT

Given the concentration of the solution, C = 0.431 M

The temperature, T = 40.0 °C = 40 + 273 = 313 K

The value of the gas constant, R = 0.08206 L･atm/K･mol

The number of ions on the dissociation of sodium phosphate, i = 4

The osmotic pressure of the solution of sodium phosphate is:

π = 4× 0.431 × 0.082 ×313

π = 44.25 atm

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The following are correct about the endpoint of a titration

a)The amount of analyte equals the amount of titrant added.

b)The solution will change from colorless to a faint pink color that lasts 30 seconds or so.

d)The amount of analyte is half the amount of titrant added.

e)The solution will change from colorless to bright pink.

The endpoint of a titration is the point at which the reaction between the reactants is complete, resulting in the formation of a precipitate, color change, or another measurable indicator. The endpoint is typically determined by an indicator, a compound that changes color at a certain pH.

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Thee correct equation of the reaction is;[tex]TiO_{2} (s) + 2Cl_{2} (g) + 2C(s)------ > TiCl_{4} (g) + 2CO(g)[/tex]

We know that a chemical reaction is said to occur when there is a combination of one or more reactants and there is a new product that is formed in the process. We know that the formation of the new product would mean that there is the breaking of bonds in the reactants such that new bonds can be formed in the products.

We know that a chemical reaction is said to be balanced when the number of atoms of  each of the elements on the reactants side is equal to the number of atoms on the products side.

Here we are told that solid titanium dioxide is heated with chlorine gas in the presence of solid carbon as a reducing agent to form gaseous titanium IV chloride.

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The orbitals within a set of hybrid orbitals will have equivalent shape and energy. Thus, the option (c) is correct.

Atomic orbitals that are formed by the combination of the valence orbitals on an atom is known as hybrid atomic orbital. The hybrid orbitals that are formed have different energies and shapes compared to the atomic orbitals that combine to form the hybrid orbitals. Hybrid orbitals helps us in explaining the shapes of the molecules and other bonding properties.

The number of hybrid orbitals in a set is equal to the number of atomic orbitals that were combined to produce the set. All orbitals in a set of hybrid orbitals are equivalent in shape and energy.

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Answer:

rfjc I N E NUMBER ++78+47+97+38+06--+78+47+97+38-06--I N E

Answer: The water becomes more acidic

Explanation:

Since the average ph of water is 7 and vinegar is an acidic substance with a ph ranging from 2-3. When it is added to water which is also a neutral substance, the water becomes more acidic.

If an object has a force of 13.5 newtons, 3 lb would it weigh in pounds.

According to Newton's Second Law of Motion, acceleration (gaining speed) occurs whenever a force acts on a mass (object). Riding a bicycle is a great example of this rule of motion in action. The mass is your bicycle. The force is generated by leg muscles pulling on your bicycle's pedals.

As we know from Newton's 2nd law of motion,

F = mg

here, F = 13.5 N

g = 9.8 m/sec

m = ?

Now, putting the values, F = mg

13.5 N = m × 9.8 m/sec

m = (13.5 N)÷(9.8 m/sec)

m = 1.378 kg

m = 3.04 lb      [ As, 1 kg = 2.2046 lbs ]

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The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of oxygen reacted is 6gram.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO +oxygen [tex]\rightarrow[/tex]  Fe[tex]_2[/tex]O[tex]_3[/tex]

Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO =1.237  Grams

Mass of  Fe[tex]_2[/tex]O[tex]_3[/tex]= 7.237  grams

According to law of conservation f mass

Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO + mass of oxygen = Mass of  Fe[tex]_2[/tex]O[tex]_3[/tex]

Substituting the values we get

1.237+ mass of oxygen   = 7.237

mass of oxygen  =6gram

Therefore the mass of oxygen reacted is 6gram.

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Gas has a molecular volume of 22.4 litres at 273 K and 1 atm. The answer to the given question is 1 atm, 1 mol, and 273°C, or 546K.

STP is frequently used when calculating gas properties, like gas density. The standard pressure is 1 atm, and the standard temperature is 273 K (0° Celsius or 32° Fahrenheit). At atp equal at sea level, this is the freezing point of pure water.

Charles' law is defined as follows, and this is how we might express the equation for Charles' law: The initial volume and temperature, V1 and T1, are equal to V2 and T2, respectively.

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You're wanting to figure out the molar mass of H2O2, which tells you the mass of one mole of this compound. There are 2 hydrogen (H) atoms and 2 oxygen (O) atoms in one molecule of H2O2, so you have to add the masses of these 4 atoms.

Different elements have different molar masses. When you look at hydrogen (H) on a periodic table (if you looked up "periodic table" and hover over H with your cursor), there will be a number, 1, that shows how many protons an atom of hydrogen has, and there will be another number (that's relevant to this problem), 1.0078 (or rounded to 1.008), that shows the mass of an atom of that element. Looking on a periodic table, hydrogen has a molar mass of 1.008 and oxygen has a molar mass of 15.999.

To figure out the molar mass of H2O2, you add two hydrogen atoms, which each have a mass of 1.008, with two oxygen atoms, which each have a mass of 15.999.

2 (1.008) + 2 (15.999) = molar mass of H2O2

The reaction quotient (Q) is 0.032 while the equilibrium constant (K'eq) is 3.1 * 10^2 .  

We know that the equilibrium constant has to do with a value that shows the extent to which the reactants have been converted into products. If the equilibrium constant is high, then a lot of the reactants would be seen to be converted into products.

In this case we are first required to obtain the reaction quotient Q and this can be done by the use of the formula;

Q = [fructose 1,6-bisphosphate] [ADP]/[fructose 6-phosphate] [ ATP]

Q = [25] [1340]/[84] [12500]

Q = 33500/ 1050000

Q = 0.032

ΔG = -RTlnQ

ΔG = change in free energy

R = gas constant

T = temperature

Q = reaction quotient

We also know that;

ΔG' = -RTlnK'eq

-14.2 * 10^3 = -(8.314 * 298)lnK'eq

lnK'eq = -14.2 * 10^3/-(8.314 * 298)

lnK'eq = 5.73

K'eq = e^5.73

K'eq =  3.1 * 10^2

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The sample of argon gas that has the same number of atoms as a 100 milliliter sample of helium gas at 1.0 atm and 300 is 100. mL at 1.0 atm and 300. K

The correct option is D.

The number of moles of gases in each of the given samples of gas is found below using the ideal gas equation.

The ideal gas equation is: PV/RT = n

where;

Moles of gas in the given helium gas sample:

P = 1.0 atm, V = 100 mL or 0.1 L, T = 300 K

n =  1 * 0.1 / 0.082 * 300

n = 0.00406 moles

For the argon gas sample:

A. n =  1 * 0.05 / 0.082 * 300

n = 0.00203 moles

B. n =  0.5 * 0.05 / 0.082 * 300

n = 0.00102 moles

C. n =  0.5 * 0.1 / 0.082 * 300

n = 0.00203 moles

D. n =  1 * 0.1 / 0.082 * 300

n = 0.00406 moles

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In order to prepare amide bonds, dicyclohexylcarbodiimide (DCC) was first used as a coupling reagent by Sheehan and Hess in 1955.

Since then, DCC has been employed for peptide synthesis. An O-acylisourea active intermediate plays a role in the creation and propagation of an amide or peptide bond in this process. It would be difficult to overestimate the significance of the typical carboxylic acid reaction with dicyclohexylcarbodiimide (DCC) and amines to produce amides in the synthesis of peptides, especially in the solid phase (Scheme 1). Dicyclohexylcarbodiimide, sometimes known as DCC, is a dehydrating agent typically employed in the laboratory to manufacture proteins. It removes a water molecule from the amino acids involved in the creation of the peptide bond and forms a suitable leaving group.

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CH3MgBr is a  reagents that can be used to accomplish the following transformation.

When primary alcohol is oxidised with a mild oxidising agent, it produces aldehyde, and when oxidised with a strong oxidising agent, it continues to oxidise.

carnosic acid Secondary alcolin does not undergo oxidation with oxidising agents gure ketone and textiary alcohol due to a lack of replaceble H bonded to carbon.

What is the name of ch3mgbr?

Methylmagnesium bromide.

When Grignard reagent CH3MgBr is treated with water we get?

Grignard reagent is not water stable and interacts with it. The interaction of methylmagnesium bromide (CH3MgBr) with water (H2O) produces methane (CH4) and MgBr (OH). This reaction efficiently hydrolyzes water to generate products.

Hence CH3MgBr  is a correct answer.

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An organic reaction is classified into four types of addition, substitution, elimination and rearrangement.

The mechanism occurs through removing of leaving group.

The major product is in attached file below.

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