Consider the hydrocarbon below. a skeletal model has line segments that slant down, run flat in a double bond, slant up, and run flat. which of these is a trans- isomer of the above hydrocarbon?

Answer:

Explanation:

Hope it helps you

There are 20.046 grams in 0.743 moles of Al.

Mole is the SI unit of measurement of the matter present inside any substance or element. It is denoted by the 'n'.

The formula of finding mole is

n = mass / molar mass

According to the question, to find the mass of Al the formula can be rewritten as mass = moles × molar mass.

Molar mass of Al = 26.98 g/mol.

Moles of Al = 0.743 moles

Therefore, mass of Al = 0.743 moles × 26.98 g/moles

Hence, mass = 20.046 grams

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A student makes up a 0. 6 M solution of acetic acid then its pOH of this solution is  13.77

Calculation ,

A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

We have to find pH of the acetic acid .

[ [tex]H^{+}[/tex] ] = 0. 6

pH = -㏒[ [tex]H^{+}[/tex] ]

pH = -㏒ [  0. 6 ]

pH  = 0.22

pH + pOH = 14

pOH = 14 - pOH = 14 - 0.22 = 13.77

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Because of the enzyme action of Amylase, the chemical breakdown of starch happens in the mouth.

It is an enzyme, simply a type of protein that aids in breaking down the carbohydrates in your body. The main two glands as the pancreas and salivary glands help in making amylase in your mouth.

A small amount of amylase is also present in your urine and blood. If the levels present in your body are high then it causes health problems.

The amylase test performs to know the amount of amylase present in your body. This test is called as "amy test".

The normal range of Amylase in the human body is 40 to 140 U/L or 0.38 to 1.42 microkat/L.

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Titration is the determination of quantity by a known amount. The pH of the solution after the solution was added with 650 mL of hydrochloric acid is 13.4.

pH is the calculation of the hydrogen ion concentration in the solution and can be used to determine the acidity or the basicity of the solution.

Given,

M₁ = 0.40 M

V₁ = 550 mL

M₂ = 0.25 M

V₂ =?

Volume at 0.25 M is calculated as,

M₁V₁ = M₂V₂

0.40 × 550.0 =0.25 × V2

V2 = 880 ml

880 mL of HCl is required for the neutralization reaction.

The final molar concentration of NaOH is,

550 × M₁ = 0.25 × 650

M₁ = 0.295 M

pH is calculated as:

pOH = -log [OH⁻]

= -log [0.295]

= 0.529

Solving further,

pH+ pOH = 14

pH = 14 - pOH

= 14 - 0.529

= 13.4

Therefore, 13.4 is the pH of the solution.

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Balanced chemical equation is  -  3Fe2+ + NO3- + 4H+ → 3Fe3+ + NO + 2H2O

Fe2+ + NO3- + H+ → Fe3+ + NO3- + NO + H2O

Fe+22+ + N+5O-23- + H+1+ → Fe+33+ + N+5O-23- + N+2O-2 + H+12O

3Fe2+ + NO3- + 4H+ → 3Fe3+ + NO + 2H2O

A balanced chemical equation specifies the quantities of reactants and products required to meet the Law of Conservation of Mass. This signifies that there is the same number of each sort of atom on the left side of the equation as there are on the right side. The rule of a balanced chemical equation is used to determine if two weights put on opposing sides of the fulcrum will balance each other.

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The incorrect statement is e = 0 for a spontaneous reaction.

The cell potential is 0 at equilibrium.

For a spontaneous reaction the value cell potential E cell is positive i.e. >0

This statement is incorrect because the potential of a cell is positive if the reaction is spontaneous. Hence it cannot be zero.

For a spontaneous reaction gibbs free energy δ g value is negative i.e. < 0

At equilibrium the value of gibbs free energy is zero i.e. δg = 0

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While assigning a term for a chemical to be an acid or base we have to look for the [tex]H^{+}[/tex] ions that can be donated by a chemical formulas or [tex]OH^{-}[/tex] ions for the basic , When you created hypotheses to guess whether each chemical was an acid or base,

To determine whether a substance is an acid or base , count the hydrogen on each substance before and after the reaction . If the number of hydrogens has decreased the substance is the acid ( donates hydrogen ions ) . If the number of hydrogens has increased that substance is the base ( accepts hydrogen ion )

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The molality of phosphoric acid, h3po4, in a solution prepared from 376 g of phosphoric acid and 1. 70×103 g of ethylene glycol, c2h4(oh)2 is 2.25m.

Ethylene Glycol is known as C2H4 (OH)2.

It is used to prepare Antifreeze solution by adding water in it.

Given,

Mass of phosphoric acid = 376g

Mass of ethylene acid = 1.7 × 10 3g

Since ethylene glycol is in excess. So it is acts as a solvent and phosphoric acid acts as solute

As we know that,

Molar mass of phosphoric acid = 98g

Moles of phosphoric acid

= Given mass / Molar mass

=376 / 98

= 3.83

Molality is defined as the ratio of moles of solute to the mass of solvent.

Molality = Moles of solute / Mass of solvent

= 3.83 / 1.7 kg

= 2.25m.

Thus, we found that the molality of phosphoric acid is 2.25m.

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Answer:

A mixture of salt and sugar can be separated by the process of filtration.

In a titration experiment, 31. 4 ml of 1. 120 M HCOOH is neutralized by 16. 3 ml of [tex]Ba(OH)_{2}[/tex]. So, the concentration of the [tex]Ba(OH)_{2}[/tex]  solution is 23.16 M

Calculation,

The formula for the dilution of a solution is given as:

[tex]M_{1} V_{1}[/tex] = [tex]M_{2} V_{2}[/tex]

Where M is molarity and V is the volume of the solution in liters ( L ).

Given data,

[tex]M_{1}[/tex] =  120  M

[tex]V_{1}[/tex] =31. 4 ml

[tex]M_{2}[/tex] = ?

[tex]V_{2}[/tex] = 16. 3 ml

120  M ×31. 4 ml  =  [tex]M_{2}[/tex]  ×  16. 3 ml

[tex]M_{2}[/tex]  = 120  M ×31. 4 ml / 16. 3 ml =23.16 M

In a titration experiment, the concentration of the [tex]Ba(OH)_{2}[/tex]  solution is 23.16 M

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Answer:

80.96 L

Explanation:

START WITH

P1 V1 = P2 V2

V2 = P1 V1 / P2

    =  751 * 38.7 / 359 = 80.96 L

According to Boyle's law, where the temperature remains constant the volume of the gas if the pressure changes to 359 mm Hg is 80.95 ml.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,

P₁V₁=P₂V₂

Substitution in the above equation gives ,V₂=751×38.7/359=80.95 ml.

Thus, the volume of gas at 359 mm Hg pressure is 80.95 ml.

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Answer: All have something wrong with them!!!

Explanation: #1: He is using chemicals without using any goggles or protection

#2: She is unsupervised while around fire as well as no protection

#3:

#4: There are many flammable things around the fire especially since its paper it could start a major fire

#5: Again has no protection (goggles. gloves, e.t.c.) and putting chemicals close to your face is just a Don't in science

#6: They are "horseplaying" and also someone else is doing all the work

The compound is classified as a secondary amine

Two organic substituents (alkyl, aryl, or both) are bonded to the nitrogen together with one hydrogen in secondary amines. Dimethylamine is a significant representation, while diphenylamine is an example of an aromatic amine. Secondary amines are amines that have two alkyl or aryl groups in place of the two hydrogen atoms of ammonia.

The molecule is methylpropylamine, a secondary amine because the nitrogen atom has both a methyl group and a propyl group. Compared to primary amines, secondary amines are more basic. The NH2 group is joined to the electron-withdrawing C6H5 group in aromatic amines. As a result, there are fewer single electron pairs available on N. Alkyl amines are hence more basic than aromatic amines.

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Answer:

Explanation: So, the atomic number is the number of protons present in an atom. For example, Helium's atomic number is 2, meaning it only has 2 protons. In most cases, the number of nuetrons and protons are equal, so Helium (usually) has 2 protons and 2 nuetrons - this is the nucleus. The atomic mass, or mass per nucleon is the proton and nuetron added together, so the atomic mass of Helium is about 4. Therefore, on the periodic table, as the atomic number increases by 1, the atomic mass increases by about 2 (the atomic mass is an average so it's not exact).

Neutrons are required. Atomic Radiation, Nuclear Graphite, and Effects

The fission reaction is often started by an impinging neutron, and each fission produces an average of 2.5 neutrons.

With the exception of the hydrogen nucleus, which has a single proton, neutrons are necessary for the stability of nuclei. Nuclear fission and fusion generate a tonne of neutrons.

Scattering tests and research on nuclear binding energies provide evidence for the nuclear forces' finite range. The neutron-proton (n-p) potential energy map in Figure 44.3a, which was created by scattering neutrons from a target containing hydrogen, illustrates the short range of the nuclear force. The n-p potential energy well is 40 to 50 MeV deep, and the nucleons are prevented from getting much closer than 0.4 fm by a strong repulsive component.

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We need to add one neutron to initiate the fission reaction.

The reaction in which the identity or characteristics of an atomic nucleus change due to the bombarding of it with an energetic particle is known as a nuclear reaction.

The bombarding particle can be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.

In nuclear fission, an atom splits into lighter nuclei due to the bombarding of an energetic particle.

The reaction given is

[tex]_{92}^{235}U + .... _{0}^{1}n \rightarrow _{52}^{137}Te + _{40}^{97}Zr +_{0}^{1}n[/tex]

To find the number of neutrons we have to balance the reaction

Atomic mass on reactant side = 235 + 1 = 236

The atomic number on the reactant side = 92

Atomic mass on the products side = 137+97+2 = 236

The atomic number on the products side = 92

As the reaction is already balanced

We need to add one neutron to initiate the fission reaction.

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The surfaces of the cylinder block and cylinder head are interconnected to help cool the engine.

When an automobile engine is running, it generates a lot of heat and needs to be continuously cooled to prevent engine damage.

This is typically accomplished by pumping coolant liquid—often water combined with antifreeze solution—through unique cooling tubes. Air passing across cylinder casings with fins helps cool some engines.

The cylinder head and block of a water-cooled engine are interconnected by coolant channels. All of the channels come together to form a single exit at the top of the cylinder head.

Hot coolant is forced out of the engine and into the radiator, which serves as a type of heat exchanger, by a pump that is driven by a pulley and belt from the crankshaft.

Unwanted heat is transferred from the radiator into the air stream, after which the cooled liquid flows back into the channels after returning to an entrance at the bottom of the block.

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When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Now write the chemical equation

CH₃COOH + CH₃OH ⇄ CH₃COOCH₃ + H₂O

Here

CH₃COOH is Ethanoic acid (Acetic acid)

CH₃OH is Methanol (Methyl Alcohol)

CH₃COOCH₃ is Methyl ethanoate (Methyl Acetate)

H₂O is water

Thus from the above conclusion we can say that When ethanoic acid react with methanol in the presence of H⁺ or heat it gives methyl ethanoate and water.

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The pH of the solution is the negative logarithm of a proton or the hydrogen ion concentration. The pH of 0.39 M acetic acid solution (CH₃COONa) is 2.58.

The pH has been said to be the hydrogen ion concentration that can also be given by the pOH.

Given,

The acid dissociation constant Ka = 1.8 × 10⁻⁵

Concentration of acetic acid (C) = 0.39 M

The hydrogen ion concentration from Ka and molar concentration are calculated as:

H⁺ = √ Ka × C

= √1.8 × 10⁻⁵ × 0.39

= √0.00000702

= 0.0026

Now, pH from hydrogen ion is calculated as,

pH = - log [H⁺]

= - log [0.0026]

= 2.58

Therefore, the pH of acetic acid is 2.58.

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Answer:

using a centrifuge

Explanation:

Centrifugation will make the large molecules to settle at the bottom.

The Most suitable answer is tyndall effect

The molar solubility of saturated solution of magnesium hydroxide  in water will be 1.4 × [tex]10^{-4}[/tex].

The concentration of such ions in a suitable solvent that will be in equilibrium with both the solid substance is known as the solubility product, or Ksp, of such an ionic compound.

When a chemical substance in the solid form would be in chemical equilibrium with such a solution of that molecule, a solubility equilibrium would be a sort of dynamic equilibrium that develops.

The molar solubility of magnesium hydroxide can be expressed as:

[tex]K_{sp} = [Mg^{2+} ][OH^{-} ]^{2}[/tex]

Let the molal solubility will be S.

[tex]K_{sp} = S(S^{2} )\\1.2 * 10^{-11} = 4S^{3} \\(S)^{3} = 0.3 *10^{-11} \\S = 1.4 *10^{-4}[/tex]

Therefore, the molar solubility of saturated solution of magnesium hydroxide  in water will be 1.4 × [tex]10^{-4}[/tex].

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The molarity of the solution can be used to give the moles and the volume of the solution. The 0.0140 M sodium thiosulfate needs 225 ml of volume.

Molarity is the property of the solution that is given by the ratio of the moles of the solute to the volume of the solution in liters.

Given,

Molarity of Sodium thiosulfate = 0.0140 M

Mass of solute (AgBr) = 0.590 gm

Molar mass of AgBr = 187.77 g/mol

First moles from the mass can be calculated as,

Moles = mass ÷ molar mass

n = 0.590 g ÷ 187.77 g/mol

= 0.00314 moles

Now, the volume of the solution from molarity is calculated as,

Volume = moles ÷ molarity

= 0.00314 moles ÷ 0.0140

= 0.225 L

Therefore, 225 mL is the volume required.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the % composition of each isotope is:

First of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.

On the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, the first isotope Gallium - 69 has an atomic mass of 69 and a percent natural abundance of X%. The second isotope Gallium - 71 has an atomic mass of 71 and a percent natural abundance of (100-X)%.

On the other hand, the Relative Atomic Mass of Gallium is 69.8 .

Then, the value of X can be calculated as:

69× X+ 71× (1-X)= 69.8

Solving

69× X+ 71× 1- 71× X= 69.8

69× X+ 71- 71× X= 69.8

69× X- 71× X= 69.8 - 71

- 2× X= -1.2

X= (-1.2)÷ (-2)

X=0.6 which expressed as a percentage is X%= 60%.

So, the % compositon of Gallium - 71 is calculated as (100-X)%=(100 -60)%= 40%

Finally, the % composition of each isotope is:

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1-octanal → 1-octanol is an oxidation reaction.

Oxidation

The removal of hydrogen or any other electropositive element, or the addition of oxygen, is said to be the process of oxidation in classical or earlier concepts. The process of an atom or ion losing one or more electrons is known as oxidation, according to the electronic notion.

An oxidizing agent is something that causes oxidation. O2, S, Cl2, Br2, and H2O2 are oxidizing agents in the instances above. Oxidation has an easy source. When an atom, molecule, or even an ion comes into contact with oxygen, oxidation results. When this occurs, it changes to achieve a more stable structure in its electron shells and transfers electrons as a result.

Any chemical process, including oxidation, is primarily brought on by atoms attempting to obtain valence shells with a complete complement of electrons. The stability of the species is increased by this optimum configuration.

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A solution of acetic acid , on a laboratory shelf was of undetermined concentration. if the pH of the solution was found to be 2. 68 , then its the concentration of the acetic acid was  2×[tex]10^{-3}[/tex]

Calculation ,

A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

We have to find concentration of the acetic acid .

pH = 2. 68

pH = -㏒[ [tex]H^{+}[/tex] ]

2. 68  = -㏒[ [tex]H^{+}[/tex] ]

[ [tex]H^{+}[/tex] ]  = [tex]10^{-2.68}[/tex]

[ [tex]H^{+}[/tex] ]  = 2×[tex]10^{-3}[/tex]

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Energy was given out in the process as such the reaction must be exothermic given the loss of energy.

The reaction profile shows the the interaction between substances. Now the vertical axes shows the energy while the horizontal axes shows the course of the reaction. The hump at the top of the profile shows the activation energy. The activation energy is the maximum energy that is required for reactants to cross the barrier and become products.

Now we know that the endothermic reaction is one in which energy is taken in while an exothermic reaction is one in which energy is given out.

As such we can see from the graph that the energy of the reactants is greater than that of the products. This implies that energy was given out in the process as such the reaction must be exothermic given the loss of energy.

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25.898 g is the amount of magnesium nitride and magnesium oxide formed.

Step1 2Mg(s)+ O2(g)-----> 2 MgO(s)

3Mg(s)+N2(g)------> Mg3N2(s)

Mg3N2(s)+ 6 H2O(l)---> 3Mg(OH)2 + 2 NH3(g)

Step2 Moles of NH3 = (2.813/17)

Moles of Mg3N2= (1/2) Moles of NH3 = (2.813/2x17)= 2.813/34

Mass of Mg3N2 = (2.813/34) x100 =8.274g (Molar mass of Mg3N2=100)

Step3 Mass of Mg in Mg3N2 =(72/100) x8.274 =5.957g

Mass of Mg converted in MgO= 21.496-5.957=15.539

Moles of MgO= Moles of Mg = 15.539/24

Mass of MgO = 15.539x40/24 =25.898 g.

Magnesium is a cofactor for over 300 enzymatic systems that regulate various biochemical reactions in the body, including protein synthesis, muscle and nerve function, glycemic control, and blood pressure regulation [1-3].

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Respiration deals with the gaseous exchange that occur between the individuals and the environment.

The term respiration deals with the gaseous exchange that occur between the individuals and the environment. The individuals take in a gas from the environment and pass out a gas to the environment. This is the way in which the balance of the universe is maintained.

Now, plants take in carbon dioxide and give out oxygen whereas animals take in oxygen and give out carbon dioxide. By so doing, the delicate carbon - oxygen balance in nature is maintained unless it is upturned by anthropogenic activities.

The following fill in the blanks as requested in the question;

a) Inhalation and exhalation'

b) trachea

c) carbon dioxide

d) leaves and stomata

e) xylem and phloem

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Answer:

a) inhalation and exhalation

b) trachea

c) carbon dioxide

d) leaves and stomata

e) xylem and phloem

The mass of the substance is the quantitative measure of the physical object. The mass of the sample must be reported as 3.5465 g. Thus, option e is correct.

The mass of the substance is the quantity of matter that the sample weighs and is reflected in grams or kilograms.

Given,

Mass of empty sample container = 12.00 g

Mass of sample + empty container = 15.5465 g

The mass of the sample will be given as,

mass of sample = (Mass of sample + empty container) - ( Mass of empty container)

= (15.5465 g - 12.00g)

=3.5465 g

Therefore, 3.5465 gm is the mass of the sample, and the correct option is e.

Your question is incomplete, but most probably your full question was, A label on an empty sample container reads 12.00 g. you add in a sample of a compound and the mass of the sample container obtaining 15.5465 g. what should the mass of the sample be reported as?

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The percentage of the original sample which would remain after 17.5 days according to the given half-life of the isotope is; 22.06%.

The given sample in discuss has a half life of; 8.02 days, this therefore indicates that after 17.5 days, the number of half-life periods completed is; 17.5/8.02 = 2.18 half-lifes.

Hence, the percentage of the original sample remaining after 17.5 days can be evaluated as follows;

N = 100% × (0.5)^2.18

N = 100 × 0.22

N = 22.06%.

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