flecainide, propafenone, and moricizine are unique in that they have no effect on the repolarization phase but do have what effect?

lead(ii) nitrate reacts with sodium sulfate in a double displacement reaction. Pb (NO₃)₂+Na₂so₄⇒Pbso₄+ 2NaNO₃ . nitrogen has highest change in oxidation  number{+2 to +5}

Oxidation state indicates the degree of oxidation for an atom in a chemical compound; it is the hypothetical charge that an atom would have if all bonds to atoms of different elements were completely ionic. Oxidation states are typically represented by integers, which can be positive, negative, or zero.

Pb{+2}⇒Pb{+2} no change in oxidation state

N{+2}⇒N{+5} oxidation state increase by a factor of three

Na{+1}⇒Na{+1} oxidation state no change

S{+6}⇒S{+6} no change in oxidation

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To answer this, we use Boyle's Law:

States that, at constant temperature, the pressure P of a gas varies inversely with its volume V.

So, if the pressure increases, the volume will decrease.

Answer: The volume decreases.

The complete balanced chemical equation for cellular respiration is as follow:

            Glucose(C₆H₁₂0₆) + 6O₂ --> 6H₂O+ 6CO₂ + ATP.

The process through which cells break down molecules for getting energy is known as cellular respiration. The cells use the oxygen present in air  to accomplish this process and produces CO₂ exhale in the atmosphere. Basically, during process of cellular respiration,  Carbon dioxide is created when the oxygen present in body and the glucose present in food are combined together  converted in to carbon dioxide, water and strongly powered reaction releases energy in the form of ATP molecules. Ion transport, muscular contraction, nerve impulse transmission, substrate phosphorylation, and chemical synthesis are just a few of the processes that use ATP as an energy source.

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1) Balance the chemical equation.

2) List the known and unknown quantities.

Reactant 1: Ca(NO3)2.

Amount of substance: 3.40 mol.

Reactant 2: Li3PO4.

Amount of substance: 2.40 mol.

Product: Ca3(PO4)2

Mass: unknown.

3) Which is the limiting reactant?

3.1-How many moles of Li3PO4 do we need to use all of the Ca(NO3)2?

The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.

We need 2.2667 mol Li3PO4 and we have 2.40 mol Li3PO4. We have enough Li3PO4. This is the excess reactant.

3.2-How many moles of Ca(NO3)2 do we need to use all of the Li3PO4?

The molar ratio between Li3PO4 and Ca(NO3)2 is 2 mol Li3PO4: 3 mol Ca(NO3)2.

We need 3.60 mol Ca(NO3)2 and we have 3.40 mol Ca(NO3)2. We do not have enough Ca(NO3)2. This is the limiting reactant.

4) Moles of Ca3(PO4)2 produced from the limiting reactant.

We have 3.40 mol Ca(NO3)2 of the limiting reactant.

The molar ratio between Ca(NO3)2 and Ca3(PO4)2 is 3 mol Ca(NO3)2: 1 mol Ca3(PO4)2.

5) Mass of Ca3(PO4)2 produced.

The molar mass of Ca3(PO4)2 is 310.1767 g/mol.

The mass of Ca3(PO4)2 produced is 351 g Ca3(PO4)2.

Option D.

.

Answer

B. The soap has a polar end that can interact with the water and a nonpolar end that can interact with the oil.

Explanation

In the case of soap, the carbon chain dissolves in oil and the ionic end dissolves in water. Thus, the soap molecules form structures called micelles. In micelles, one end is towards the oil droplet, and the other end which is the ionic faces outside.

Hence, the correct answer is:

B. The soap has a polar end that can interact with the water and a nonpolar end that can interact with the oil.

A photon of light is released when an electron in its orbit around an atom transitions from a high energy state to a lower energy state. The statement E=hf, where h is Planck's constant.

It can be used to relate the energy of the photon to the frequency f of the photon, which is related to the color of the photon. The difference in energy between the two states is what causes the photon's varied wavelength (or, alternatively, frequency). The element's spectrum is made up of these released photons. The atomic emission spectrum of an element shows only specific colors, which indicates that only specific light frequencies are emitted. Excited electrons that revert to the ground state result in atomic emission spectra. The energy of the particular electrons are reflected in the light that is emitted. Because each element has a unique collection of electron energy levels, each element's emission spectrum is unique. The disparities between various pairs of numerous energy levels are shown by the emission lines. As electrons transition from higher energy orbitals to lower energy orbitals, lines (photons) are released. Nuclear Spectra. When atoms are stimulated, they release light at specific wavelengths that are associated with various colors.

Every element generates an own collection of spectral lines. Since no two elements produce the identical spectral lines, the line spectrum of an element can be used to identify it.

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Mg, Zn metal ion or combination of ions restores alkaline phosphatase activity closest to that of native enzyme.

The physiological function of alkaline phosphatase is to dephosphorylate substances. The enzyme is present across a wide range of prokaryotes and eukaryotes, serving the same general purpose but taking on different structural forms depending on the environment in which they are active.

The periplasm of E. coli bacteria contains alkaline phosphatase. The highest activity of this enzyme occurs at high pH levels and it is heat stable. Depending on where it originated in the body, it might appear in a variety of ways in people.

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First, we have to calculate the molecular weights of each molecule:

Then, we have to calculate the number of grams of water. We can calculate them because the process of evaporation lets us know the water amount that was retired:

Then, we're gonna convert the grams of sodium carbonate alone (30.2 g) and the grams of water to moles:

It means that the mole relation is 1:1 approx, as it is the same amount for both. Then, the formula is going to be:

It means that the answer is A.

Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H₂) and zinc chloride (ZnCl₂). The balance chemical equation is given as :

Zn + 2HCl  ---->  ZnCl₂   +   H₂

Zinc react very rapidly with hydrochloric acid to form zinc chloride and hydrogen gas. This reaction is called as displacement reaction because zinc is displaces the hydrogen and form zinc chloride and hydrogen gas.  The reaction is exothermic because it releases a lot of heat.

Thus, Dr. West mixes zinc (Zn) and hydrochloric acid (HCl) together in his laboratory. The two chemicals react to form hydrogen gas (H₂) and zinc chloride (ZnCl₂). The balance chemical equation is given as :

Zn + 2HCl  ---->  ZnCl₂   +   H₂

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18 electrons.

According to the question, we have that sulphur has 16 electrons and after bonding with magnesium acquired a 2-charge. The sulphur ion S2- shows that sulphur has gained 2electrons to become stable.

Amount of electron S2- have = 16 electron + 2electrons

Amount of electron S2- have = 18 electrons

Hence the number of electrons S2- ion have is 18 electrons.

Explanation:

Orbitals are filled according to the aufbau principle. That is, lower energy orbitals are filled before higher energy orbitals are filled. Therefore, fill each energy level before moving up

Answer:

The second last option is correct.

The Molality of the aqueous sodium acetate,NaC2H3O2 solution  is  0.298m.

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molality is ,

Molality of the solution=moles of the solute /mass of the solvent

An aqueous sodium acetate solution is made by dissolving 0.185 mole NaC2H3 in 0.620 kg of water. here solvent is the water and solution is sodium acetate.

Moles of NaC2H3O2 = 0.185 mole

Mass of solvent  = 0.620 kg

putting all values in the expression of molality we get,

Molality of NaC2H3O2 = 0.185 mole / 0.620

                                        =0.298m

Hence, the molality of  solution is 0.298 m.

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Octanol alcohol is needed to make octyl formate and Formic Acid carboxylic acid is needed to make octyl formate.

The organic substance 1-octanol, commonly referred to as octan-1-ol, has the chemical formula CH3(CH2)7OH. The alcohol is fatty. In general, octanols refer to a wide variety of different isomers. In the industrial setting, octanol is mostly generated by oligomerizing ethylene with triethyl aluminum, followed by oxidation of the resulting alkylaluminium products. The Ziegler alcohol synthesis is the name of this method.

An organic acid with a carboxyl group connected to an R-group is referred to as a carboxylic acid in organic chemistry. R stands for the alkyl, alkenyl, aryl, or other group, and the typical formula of a carboxylic acid is RCOOH or RCO2H. It is common to find carboxylic acids.

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Molar absorptivity and the concentration of the solution whose absorbance is 0.52 at 525nm is 2600M-1 cm-1 and 0.20mM.

Molar absorbance is the measure how strongly a chemical species absorbs at given  wavelength of light. Beers law relates the absorbance of a solution to its molar concentration. Beers law states that the light that absorbs by the solution is directly proportional to the concentration of the substance absorbing the light.

Absorbance and concentration are related to each other using the path length of light and molar absorptivity of the substance. Molar absorptivity of a substance is given by,

          A= E.I.C

          0.26= 1.00cm .e . 0.10 . 10-3 M

           e= 0.26 / 0.10 *10-3 M.cm

              = 2600M-1cm-1

In the same way we have to calculate the concentration of the another sample using path length and molar absorptivity which are same for both the samples .

Calculating the relation, we got the concentration of 0.2mM.

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Physical property  might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.

First we separate iron fillings from the mixture by using magnet. Then we dissolve the sand and salt mixture in water. salt is soluble in water and sand is insoluble in water. sand is now can be separated by the filtration process.  last we have salt mixed in water . on heating the solution water get evaporated and salt crystal are left behind.

Thus, Physical property  might help you remove salt from the mixture solubility. Process use to separate the salt from the mixture is filtration and Distillation. Physical property of properties might help to remove iron from the mixture is Magnetism. process will you use to separate the iron from the mixture is using magnet. Physical property or properties might help you remove sand from the mixture is solubility. process use to remove sand from the mixture Filtration.

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The average molecular velocity can be defined as follows:

Where,

R is a constant

T is the temperature

M is the molar mass

If we assume that the temperature is the same for all gases, the velocity will vary according to its molar mass. We see that the molar mass is inversely proportional to the speed, the greater the mass of the gas, the slower it will move. Therefore we are going to determine the molar mass of the gases:

Therefore, the order according to the average velocity will go. We must organize from the largest molar mass to the smallest molar mass.

BrF

The answer will be 6. Option

Answer:

Amorphous solid is a form of solid

Explanation:

Amorphous solid is a solid in which atoms are not arranged in a definite geomatric pattern for eg. glass,paper etc

The balanced equation for the complete oxidation reaction that occurs when methanol CH₃OH burns in air is 2CH₃OH + 3O₂ → 2H₂O + 4CO₂.

When Methane CH₃OH reacts with O₂, it get oxidized and CO₂ and H₂O are formed.

The chemical equation of the oxidation of methane when it burns in the air is,

CH₃OH + O₂ → H₂O + O₂

In order to balance the reaction, we should start first with carbon, then Hydrogen and at the end, we will balance oxygen atoms on both the sides of the reaction,

So, the balanced chemical equation becomes,

2CH₃OH + 3O₂ → 2H₂O + 4CO₂

So, in this reaction, Carbon is getting oxides as it is becoming carbon dioxide by the addition of oxygen into it and Oxygen itself is getting reduced.

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The properties of the given element, Pb, is as follows:

The periodic table is an arrangement of the elements in increasing order of atomic number.

The atoms of elements are composed of three sub-atomic particles;

The element Lead, Pb,  is a metallic element found in the periodic table and has an atomic number of 82 and an average atomic mass of 207.2

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It emphasizes that un-electrified regions have been left behind by international advances in technology. Option A.

A central idea is the central unifying element of a story that ties together all other elements of fiction that the author uses to tell the story. The central idea is best described as the dominant impression or universal, prevalent truth found in the narrative: renewable energy sources such as wind, water, solar and geothermal.

The refrigerator or freezer may be out of power. The phone line goes down and the phone signal is lost. When the battery gets low, the phone becomes useless as there is no backup charging option. The gas central heating doesn't work and the tap stops pumping clean water quickly. Sustainable energy comes from resources that can sustain continuous operation without jeopardizing the energy needs or climate of future generations.

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Configurational isomers are stereoisomers that can't be transformed into each other via rotating the molecule around a single bond. those configurational isomers may be found in kinds such as geometrical isomers and optical isomers.

Enantiomers are pairs of compounds with precisely equal connectivity however contrary to three-dimensional shapes. Enantiomers aren't the same as every different; one enantiomer can not be superimposed on the alternative. Enantiomers reflect images of every different.

Diastereomers are a kind of stereoisomer. Diastereomers are described as non-mirror pictures, non-same stereoisomers. hence, they arise whilst two or greater stereoisomers of a compound have specific configurations at one or greater of the equal stereocenters and aren't replicate pics of every different

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The concentration of nitrate ion in the final solution is 0.48 M.

An abundance of a constituent divided by the total volume of a mixture is known as concentration. There are various types of concentrations: Mass, molar, number, and volume. The quantity of a solute found in the given amount of solution is the concentration of the substance. Concentration is expressed in terms of molarity.

Molarity means the number of moles per litre. The unit symbol is mol / L or mol / dm³ in the SI unit.

To calculate the concentration of the solution,

                     [tex]C_{1}V_{1} + n C_{2}V_{2} = C * total volume[/tex]       →   1

where,   [tex]C_{1}[/tex]  =  concentration of the starting solution

              [tex]C_{2}[/tex]  =  concentration of the desired solution

               [tex]V_{1}[/tex]  =  volume of the starting solution

               [tex]V_{2}[/tex]  =  volume of the desired solution

As per the question,

Substitute the values in 1,

⇒      [tex]C_{1}V_{1} + n C_{2}V_{2} = C * total volume[/tex]

⇒      0.255 × 0.035 + 2 × 0.328 × 0.045  =  C × 0.08

⇒      0.008925 + 2 × 0.01476  =  C × 0.08

⇒      0.008925 + 0.02952  =  C × 0.08

⇒      C × 0.08  =  0.038445

⇒      C   =  0.038445 /  0.08

⇒      C   =  0.4805625

Therefore, 0.48 M is the concentration of the Nitrate ion in the final solution.

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The aluminum ball with a 2.70 g/mL will sink when placed in a water.

The density of a substance is defined as the mass per unit volume of the substance i.e

Density = mass / volume

Substance with higher density tends to sink when place in a liquid of lower density.

Fom the question given above, we were told that the density of the aluminum ball is 2.7 g/mL. We know also that the density of water is 1 g/mL.

If the aluminum ball is placed in the water, the aluminum ball will sink because it's density is greater than that of water.

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Gravity is a (n) force between objects and depends on an object's size and their distance apart.

Gravitational force is the attractive that exist between all object with mass an object with mass attracts another object with mass the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects

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To find the molar mass, what we do is to follow the steps:

1. Make use of the chemical formula to determine the number of atoms of each element in the compound.

2. Multiply the molar mass of each element with its number of atoms present in the compound.

3. Add up all and assign unit as grams/mole.

In this problem, the molecule of water contains 2 atoms of Hydrogen and 1 atom of Oxygen.

The molar mass of Hydrogen is about 1g/mol and the molar mass of Oxygen is about 16g/mol, so:

Therefore, the answer is 18 g/mol.

The type of glassware that students need to use to prepare 250 ml of a 0.800 m aqueous solution of sucrose is a volumetric flask and the correct amount of solute to use is 68.46g.

It is always recommended to use volumetric flask when you make sucrose solution, as accuracy is very important. Other glassware can be used to make water measurements more accurate, but it is always better to use a volumetric flask to  this stock solution. and the correct amount of solute to use can be calculate as follow:

In this case, sucrose is a solid compound, so the best way to measure it is to use a balance and weigh the required mass based on the concentration of the solution. Therefore, it is best to measure grams of solute on a scale.

The amounts required are:

M = n/V

n = M*V

n = 0.800 * 0.250 = 0.2 moles

To get the mass:

m = n*MM

The molar mass of sucrose is 342.3 g/mol.

m = 0.2 * 342.3

m = 68.46g

Finally, after we have weighed the mass of sucrose we need, so all that remains is to add the solute to the volumetric flask and add water. In this way, sucrose mixes with water into a solution. Then, to make the solution 0.800M, the volume should be 250mL.

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Answer:

d

Explanation:

exotic species, took this last week.

An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion. An aquifer can be a well, spring, lake ,etc.

Water collects in geological formations called aquifers, frequently at great depths in the earth. Some aquifers are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.

Hence, An aquifer is a geological formation that stores water. they are higher than the surrounding terrain, which can lead to springs or artesian wells that are in motion.

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Answer:

Most alpha particles passed straight through the gold foil, which implied that atoms are mostly composed of open space. Some alpha particles were deflected slightly, suggesting interactions with other positively charged particles within the atom.

Explanation:  

Rutherford model, also called Rutherford atomic model, nuclear atom, or planetary model of the atom, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford. The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun.