Because you want to study how botulinum toxin works, but you do not want to paralyze an animal, you decide to determine the effect of botulinum toxin on yeast. Botulinum toxin has a MW= 149323.05 and you have a 5ml stock bottle that contains 70% w/v botulinum toxin, 50mL of yeast growing in a liquid culture, and 25ml H2O. Your lab protocol performs treatments in 500µL samples.

According to the given statement The mass percentage of the solute is 2.2%.

As a mass percentage, an element's quantity in a compound or component of a combination can be expressed. The mass percentage is calculated by multiplying this result by 100% after dividing the comparable higher by the masses of each component.

When the mass of a solute and the mass of a solution are known, the concentration of a solution is expressed as a mass percent.

A mass percentage is calculated by multiplying the ratio of the solute's mass to the total mass by 100.

5.85/250+5.85*100

=2.2 %

The mass percentage of the solute is 2.2%.

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According to Le Châtelier's principle, if a dynamic equilibrium is disturbed by changing the conditions, the equilibrium position will move to compensate for the change and restore the equilibrium.

Le Chatelier's Principle states that "a system at equilibrium will modify itself in such a way to minimize the effect of that change made in it" when external stress is applied by changing concentration, pressure, or temperature.

Change in Concentration:

A  +  B    ⇆    C

In order to counteract the impact of the additional reactant added, the equilibrium will shift forward and produce more product when the concentration of reactants (A or B) is increased. Or it will react in the opposite way if product (C) is added.

Change in Pressure:

A  +  B    ⇆    C

Because there is a decrease in volume at the product side, if pressure is applied to this equilibrium, the equilibrium will shift in the direction of forwarding motion (1 mole as compared to reactants which are 2 moles). If the pressure drops, the opposite situation will be seen.

Change in Temperature:

A  +  B    ⇆    C  + Heat

The heat produced in this exothermic reaction (heat is evolved) is on the product side. The equilibrium will shift in the opposite direction as the temperature rises. A drop in temperature will cause the equilibrium to move forward.

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Molecular mass of Phenol = 94 g/mol

Ethanol = 46 g/mol

Weight of Phenol Taken = 25.5 g

Ethanol = 495 g

Total Weight = 495 + 25.5 = 520.5 g

So moles of phenol = 25.5 94 = 0.27

mole of ethanol = 495 / 46 = 10.76

1.  Mole fraction of phenol = 0.27 / (10.76 + 0.27) = 0.27 / 11.03 = 0.0244

2. Mass % of phenol = mass of phenol / total mass x 100

25.5 / x 10.5 = 4.9 %

3. Molar concentration of phenol = mol Phenol/mass of solvent (kg)

the solvent is ethanol =>  Because presents an exceedingly high amount

0.27 / 495 X 1000 m = 0.54m

4. Molarity = moles of phenol/ vol of solution (in liter)

Density of solution = 0.938 g/mL 44

Mass of solution = 520.5 g

Volume of Solution = Mass / Density = 520.5 / 0.938 = 554.9 or 555 ml

Molarity = (0.27 / 555)X 1000 = 0.48 M.

Phenol has unique properties and is not classified as alcohol. They are highly acidic because the aromatic ring is tightly bound to oxygen and the bond between oxygen and hydrogen is relatively loose.

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Transport of Na+ from a place of low concentration to a place of higher concentration. This is the right answer.

The sodium-potassium pump is the most common and well-known example of active transport. At the cell membrane, the sodium-potassium pump moves 3 sodium ions out of the cell and two potassium ions into the cell per ATP. Examples of active transport include the uptake of glucose in the human intestine and the uptake of minerals and ions into the root hair cells of plants.

One of the greatest examples of active transport is the movement of calcium ions out of cardiomyocytes. Cells secrete proteins such as enzymes, antibodies, and various other peptide hormones. Amino acids are transported across the intestinal mucosa of the human intestine. The movement of ions or molecules across cell membranes to regions of a higher concentration is assisted by enzymes and requires energy.

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By converting 21 miles/hr to centimeter we get :

938.784 cm/s

            dmi /thr = vmph

Steps to convert miles per hour to cm :

To convert 21 miles/hr to cm/s:

21 mph =

= (21 × 44.704)

= 938.784cm/s

21mph is 938.784cm/s

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Avogadro's number is number of elementary entities (atoms or molecules) comprising one mole of a given substance.

Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.

It is the number of elementary entities (atoms or molecules) comprising one mole of a given substance.

The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction.

Therefore, it can be simply said that Avogadro's number is the number of units in one mole of a substance.

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Taking into account the reaction stoichiometry, 45.35 grams of copper(II) chloride are needed to produce 42.8 g copper(II) phosphate in the presence of excess sodium phosphate.

In first place, the balanced reaction is:

3 CuCl₂ + 2 Na₃PO₄ → Cu₃(PO₄)₂ + 6 NaCl

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 380.62 grams of Cu₃(PO₄)₂ are produced by 403.32 grams of CuCl₂, 42.8 grams of Cu₃(PO₄)₂ are produced by how much mass of CuCl₂?

mass of CuCl₂= (42.8 grams of Cu₃(PO₄)₂× 403.32 grams of CuCl₂) ÷380.62 grams of Cu₃(PO₄)₂

mass of CuCl₂= 45.35 grams

Finally, 45.35 grams of CuCl₂ is required to produce 42.8 g copper(II) phosphate.

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A solution to be supersaturated means more solute can still be dissolved in the solvent.

A solution is said to be supersaturated if it contains more solute than can effectively dissolve at a certain temperature. The injection of a tiny crystal of solute, known as a seed crystal, can start the recrystallization of the excess dissolved solute in a supersaturated solution.

A saturated solution is one that has dissolved the most solute possible at the temperature specified. A supersaturated solution is one that contains more solute than is necessary to reach saturation.

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Kelvin temperature will the reaction proceed 4.50 times faster than it did at 315 K is 293K

Temperature is the degree of hotness or coldness of an object

Here given data is certain reaction has an activation energy of 36.11 kJ/mol and reaction proceed 4.50 times faster than it did at 315 K and we have to find kelvin temperature = ?

Then, we have to use the arrhenius equation and set k1 = 1 and k2 = 4.50 because rate = k[A] so as long as concentration of reactants doesn't vary, rate is proportional to k

ln (k₂/k₁) = Ea/R(1/T₁ - 1/T₂)

k₂ = 4.50

k₁ = 1

Ea = 36.11 J/mole

R = 8.314 J/mol⁻k

T ₁= 315 K

T₂ = ?

ln(4.50/1) = 36.11/8.314 (1/314 - 1/T₂)

1.50 = 4.343 (1/315 - 1/T₂)

1.50 = 0.013 - 4.343/T₂

-1.48 = - 4.343/T₂

T₂ = 293 K

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Concave shape of Wave Rock is the physical evidence that supports the evolution of Earth due to deposition.

The concave shape of Wave Rock is nice physical evidence of deposition in the Earth's evolution. It is a 2.7-billion-year-old land structure that served as the foundation for the formation of the Australian continent.

A naturally occurring rock formation that resembles a tall, breaking ocean wave is called Wave Rock. The "wave" is roughly 110 m (360 ft) long and 15 m (49 ft) tall. It makes up the north side of the isolated hill known as "Hyden Rock."

Since Wave Rock is made of much tougher material from its surroundings, the weathering lowered the surrounding terrain while the bedrock remained to serve as a witness for the past.

The structure of Wave Rock was created by the weathering of the surrounding area, and this is exactly what proves the deposition part. Wave Rock was below the ground because of the deposition of the material around it over time.

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Complete Question

Which physical evidence supports the evolution of Earth due to deposition?

A) Red color of Thor's Hammer

B) Concave shape of Wave Rock

C) Streaks on the face of Wave Rock

D) Broader tip than base of Thor's Hammer

a.) 4.04E-5 moles of acidic protons

b.) 2.02E-5 mole of H2B in the fruit drink

A proton can be defined  as a stable subatomic particle with symbol p , H⁺, or ¹H⁺ that has a positive electric charge of +1 e elementary charge.

The mole with its symbol mol, is the unit of amount of substance in the International System of Units. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

The formula for the number of moles formula is expressed as follows;

Number of moles = Mass of substance / Mass of one mole.

n = m/M

from the given above, we have that

mass of sample = 1.00g

a.)  Moles of acidic protons due to H2B in the fruit drink sample will be

6.04E-5 moles of acidic protons -  2.00E-5 moles were due to VC

= 4.04E-5 moles of acidic protons.

b.) Moles of H2B in the fruit drink sample = 2.02E-5 mole of H2B in the fruit drink

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Answer:

A. Solid

Explanation:

We must look for the pressure of 0.25atm on the vertical axis, and the temperature of 0°C on the horizontal axis, like we can see in the following drawing:

Finally, the phase of water is solid.

Water cannot stay liquid below zero degree Celsius (0°C) because it freezes at 0°C.

Freezing point is the temperature at which a liquid freezes, and the solid and liquid phases are in equilibrium.

Different liquids have different freezing points. Water as a liquid has a freezing point of 0 °C. This means that water in a liquid state will begin to turn solid (ice) at that temperature.

For example;

In accordance with this question, water cannot stay liquid below a temperature of 0°C because it has a freezing point of 0°C.

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Answer:

12.1 grams and 77.8%

Explanation:

(Note: in this answer, sig figs are rounded in the end, not along the way) The molar ratio of calcium sulfate to calcium hydroxide is 1:1
there are 6.56 grams of calcium hydroxide, so the number of moles is the number of grams / the molar mass, which is (6.56 grams) / (74.093 g/mole)
=0.08854 moles of calcium hydroxide
Theoretically, 0.08854 moles of calcium hydroxide would make 0.08854 moles of calcium sulfate.
To find the number of grams of calcium sulfate, multiply the number of moles by the molar mass, which is .08854 * 136.14 = 12.054 grams, or
12.05 grams
The percentage yield of calcium sulfate is just the actual yield / predicted yield, which is 9.37/12.05 which is 0.7776, or 77.8%

Explanation:

H₂PO₄⁻ (aq) + NH₃ (aq) ---> HPO₄²⁻ (aq) + NH₄⁺ (aq)

acid base conjugate base conjugate acid

H₂PO₄⁻ is donating a proton to NH₃. So H₂PO₄⁻ is acting like an acid, and NH₃ is acting as the base. Then, HPO₄²⁻ is the conjugate base of H₂PO₄⁻ and NH₄⁺ is the conjugate acid of NH₃.

Answer: b) acid

The molar mass of a chemical compound is defined as the mass of the sample divided by the quantity, or number of moles, in the sample, measured in moles. The total grams of Nacl needed to get 0.241 moles exists 14.084 g.

The molar mass of a chemical compound is determined by dividing its mass by the quantity of that compound, expressed as the number of moles in the sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one.

The molar mass of a chemical compound is defined as the mass of the sample divided by the quantity, or number of moles, in the sample, measured in moles.

Molar mass of Nacl = 58.44g

Total grams of Nacl needed to get 0.241 moles = moles number × molar mass

= 0.241 × 58.44

= 14.084 g

Therefore, the total grams of Nacl needed to get 0.241 moles exists 14.084 g.

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From the mole ratio and the masses of reactants:

The maximum amount of the product that can be formed is calculated from the equation of reaction as follows:

The mole ratio of hydrogen to nitrogen is 3 : 1

From the given data:

4.67 grams of hydrogen gas are allowed to react with 4.67 grams of nitrogen.

The moles of the reactants is determined as follows:

Moles of hydrogen = 4.65/2 = 2.325 moles

Moles of nitrogen = 4.67/28 = 0.1667 moles

Hence, the limiting reagent is nitrogen while the excess reagent is hydrogen.

The maximum moles of ammonia (NH₃ ) that can be formed = 0.1667 moles.

mass of ammonia formed = 0.1667 * 17 grams

mass of ammonia formed = 2.83 g

The moles of the excess reagent remaining after the reaction is complete = 2.325 - (0.1667 * 3) = 1.825

moles of the excess reagent remaining = 1.835 moles

mass of the excess reagent remaining = 1.825 * 2

mass of the excess reagent remaining = 3.65 grams

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Elizabeth using an electrostatic dust print lifter at a crime scene means her evidence is most likely an impression that is not very deep and is denoted as option A.

These refers to the information and happenings which help to prove that something is true and is used in investigations so as to ensure that the culprit is caught.

The electrostatic dust print lifter employs the use of electrostatic adhesion turned on which attracts dust to it and for such to occur, then it means the impression is not very deep which is why it was chosen as the correct choice.

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Answer: A

Explanation:

The time taken for 11.6% of the products to remain is 22.4 s.

The rate of reaction is the rate at which the reactants are depleted from the system or the rate at which the products appear in the system. Now we have a first order reaction. Recall that the formula of the first order reaction is written as;

ln[A] = -kt + ln[A]o

ln[A] = concertation at time t

t = time taken

k = rate constant

[A]o = initial concentration

Given that;

[A]  = 0.116[A]o and k = 0.0960 s−1

Then;

ln0.116[A]o = -0.0960t + ln[A]o

0.0960t  =  ln[A]o - ln0.116[A]o

0.0960t = ln([A]o/0.116[A]o)

0.0960t = ln(1/0.116)

0.0960t = 2.154

t = 2.154/0.0960

t = 22.4 s

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If 10.5 g of Ag and 7.5 g of S are reacted and 9.8 g of  [tex]Ag_2S[/tex] is obtained, the percent yield of the reaction would be 81.4%

Ag and S react to form [tex]Ag_2S[/tex] as follows:

[tex]2Ag + S -- > Ag_2S[/tex]

The mole ratio of Ag to S is 2:1.

10.5 g of Ag = 10.5/108

                     = 0.0972 moles

7.5 g of S = 7.5/32

                = 0.2344 moles

In other words, Ag is limiting in availability.

The mole ratio of Ag to  [tex]Ag_2S[/tex] = 2:1

0.0972 Ag is equivalent to 0.0972/2 = 0.0486 moles of  [tex]Ag_2S[/tex]

0.0486 moles  [tex]Ag_2S[/tex] weighs = 0.0486 x 247.8

                                              = 12.04 grams

percent yield of  [tex]Ag_2S[/tex] = 9.8/12.04 x 100%

                                   = 81.4%

The percent yield of [tex]Ag_2S[/tex] that the chemist actually obtained is 81.4%.

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Answer: 79.5

Explanation:  Every positive exponent moves the decimal one place to the right.  So if you are multiplying by one less decimal to get the same answer your starting number would have to be one place greater to the right.  

If your exponents are negative numbers the decimal moves one place per each number to the left.  You'll learn that later.  Math is a blast!  Enjoy it!  

The percent yield is 85.16%

Percent yield is the percent ratio of the weight of the product obtained to the theoretical yield and we calculate the percent yield by dividing the experimental yield by the theoretical yield and multiplying the result by 100 to express the final answer in %

Here given data is carbon disulfide (CS₂) reacts with excess chlorine (Cl₂) to produce carbon tetrachloride (CCl₄) and disulfur dichloride (S₂Cl₂) if 73.5 g of CS₂ yields 86.3 g of CCl₄ means reaction is

CS₂ + Cl₂ → CCl₄ + S₂Cl₂

And here weight are given CS₂ = 73.5 g and CCl₄ = 86.3 g

So, % yield =  ratio of the weight

% yield =   73.5 g/86.3 g×100

% yield = 85.16%

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Answer:

Argon - Ar has 18 electrons

An ion that has 18 electrons is a potassium ion.

Hope this helps!

Explanation:

74.5 gram of Fe₂O₃ is formed from 22.4 g of O2

The balanced equation of the reaction is

4 Fe + 3 O₂ → 2 Fe₂O₃

4 moles of Fe and 3 moles of O₂ gives 2 moles of Fe₂O₃

Number of moles in 22.4g of O₂ = Given mass / molar mass [Molar mass of O₂ = 32]

                                                    = 22.4 / 32

                                                   = 0.7 moles

We know that, 3 moles of oxygen form 2 moles of Fe₂O₃

0.7 moles of O₂ form [(2/3) * 0.7] = 0.47 moles of Fe₂O₃

Thus, mass of Fe₂O₃ = number of moles * molar mass [Molar mass of Fe₂O₃ = 159.69]

                                = 0.47 * 159.69

                                = 74.5 grams of Fe₂O₃

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Four types of observations that indicates occurring of a chemical change are -

When a chemical change occurs, color of the product is changed. Chemical change is an irreversible change. It cannot be undone as physical change.

A chemical change is an exothermic reaction. A large amount of heat is released when a chemical change occur. As the product formed in a chemical change is changed in its state, color, etc. which requires a large amount of heat.

Precipitate formation occurs in a chemical change as chemical change occurs in aqueous solution where two ionic bonds combine and forms insoluble salt called precipitate.

A chemical reaction releases off a gas. An example is reaction of baking soda and lemon juice. It releases carbon dioxide gas.

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The chemical symbol for the ion will be  [tex]Ar^2^+[/tex]

The ion has a total of 16 electrons

The ion has a total of zero 3d electrons

The atom in question is a cation with a charge of +2.

The electron configuration goes thus: [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^4[/tex]

The total number of electrons of the ion of the atom can be calculated as:

2+2+6++2+4 = 16

With a charge of +2, it means two electrons have been lost. The total number of electrons in the atom would be:

16 + 2 = 18.

The symbol of an atom of a neutral element with 18 electrons is Ar. A neutral atom will have an equal number of protons and electrons. The number of protons in an atom is equivalent to the atomic number.

Thus, the atom is Argon with the symbol Ar.

The chemical symbol for the ion would, therefore, be [tex]Ar^2^+[/tex]

From the electron configuration, the ion has no 3d electrons. In other words, there are zero 3d electrons in the ion.

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The concentration of the oxonim ion is 0.0099 M while the pH of the solution is 2.

The term Ka means the acid dissociation constant. This speaks of the extent to which the acid is able to become dissociated in water. We know that is an acid is able to dissociate completely in water then the acid is a strong acid. However, if the acid is not able to dissociate complete in solution then the acid is a weak acid.

We can now set up the ICE table as we would show below;

      HNO2(aq) + H2O (l) ⇔ H3O^+(aq)  + NO2^-(aq)

I      0.145                                 0                     0

C       -x                                    +x               +x  

E     0.145 - x                            x                   x

Ka = 7.2x10^−4

Ka = [H3O^+] [NO2^-]/[ HNO2]

7.2x10^−4 = x^2/0.145 - x  

7.2x10^−4(0.145 - x) = x^2

1.044 * 10^-4 - 7.2x10^−4x = x^2

x^2 +  7.2 * 10^-4x - 1.044 * 10^-4 = 0

x=0.0099 M

Then we know that  [H3O^+] = [NO2^-]

Thus;

pH = - log(  [H3O^+])

pH = - log(0.0099 M)

pH = 2

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Answer:Magnesium nitrate will react with sodium hydroxide to form magnesium hydroxide and sodium nitrate.

Explanation:

He takes photos of every piece of evidence before it is sent to the lab is what Sergeant Jeffers who likes photo array will do in this case and is denoted as option B.

This is defined as the process in which something is examined and it is usually accompanied with thorough search for facts so as to get accurate and meaningful results.

The use of photo arrays for investigation means that photos of every piece of evidence is taken which is worked on by the professional through series of techniques so as to catch the culprit and ensure justice is served.

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