To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for
that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.

To determine the conditions that guarantee a local minimum of the average cost function (AC(q)) at q = 27, we need to consider the relationship between AC(q) and MC(a) at that point.

To determine the conditions that guarantee a local minimum of the average cost function (AC(q)) at q = 27, we need to consider the relationship between AC(q) and MC(a) at that point.

Here are the possible conditions:

1. AC(q) = MC(a) at q = 27: If the average cost (AC) is equal to the marginal cost (MC) at q = 27, it suggests that the average cost is not changing at that point. This condition could indicate a local minimum for AC(q) at q = 27.

2. AC(q) < MC(a) for q < 27 and AC(q) > MC(a) for q > 27: If the average cost is lower than the marginal cost for q values less than 27 and higher than the marginal cost for q values greater than 27, it suggests that AC(q) is decreasing before q = 27 and increasing after q = 27. This condition could indicate a local minimum for AC(q) at q = 27.

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The molarity of the solution made by dissolving 0.05 mole of hydrogen chloride (HCl) in 2 L of water (H₂O) is 0.025 M

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Molarity = mole / Volume

Molarity = 0.05 / 2

Molarity = 0.025 M

Thus, the molarity of the solution is 0.025 M

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The osmotic concentration of a 10.0 mM MgCl2 solution is approximately 20.0 osmol/L.

Osmotic concentration refers to the concentration of osmotically active particles in a solution, which determines its osmotic pressure. To calculate the osmotic concentration of a solution, we need to consider the number of particles that contribute to the osmotic pressure.

In the case of MgCl2, it dissociates in water to produce three particles: one Mg2+ ion and two Cl- ions. Therefore, each mole of MgCl2 produces three osmotically active particles.

Given that the solution has a concentration of 10.0 mM (millimoles per liter) MgCl2, we can convert it to moles by dividing by 1000. So, 10.0 mM is equal to 0.010 moles per liter.

Since each mole of MgCl2 produces three osmotically active particles, we multiply the concentration by three to obtain the osmotic concentration. Therefore, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 0.010 moles/L × 3 = 0.030 osmol/L.

Finally, to convert osmol/L to milliosmoles per liter (mosmol/L), we multiply by 1000. Thus, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 0.030 osmol/L × 1000 = 30.0 mmol/L.

Therefore, the osmotic concentration of the 10.0 mM MgCl2 solution is approximately 30.0 mosmol/L, or simply 20.0 osmol/L (since osmol/L and mosmol/L represent the same unit of osmotic concentration).

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Answer:

the answer is c). transverse wave

In the given reaction, iron (Fe) is oxidized to form iron(III) oxide (Fe2O3), while oxygen (O2) is reduced to form water (H2O).

Oxidizing agent can be defined as a substance that oxidizes other substance and help carry out oxidation while reducing agent helps to reduce other element or compound present in a reaction. Both these processes, that is oxidation and reduction takes place simultaneously.

The oxidizing agent in this reaction is oxygen (O2), which accepts electrons from iron (Fe). The reducing agent is iron (Fe), which donates electrons to oxygen (O2).

The oxidation half-reaction is:
4Fe(s) → 4Fe3+(aq) + 12e-

The reduction half-reaction is:
3O2(g) + 12e- → 6O2-(aq)

Overall reaction:
4Fe(s) + 3O2(g) → 2Fe2O3(s)

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Answer:

Sugar

Explanation:

The carbon is in form of sugar prior to the lion eating the giraffe. This form of carbon in the giraffe serves as a rich source of nutrient for the lion.

The carbon enters living organisms as carbon dioxide. As it enters, it is converted by plants into glucose, a from of sugar.

When giraffes eats the glucose in plant, it is stored in them and used for the liberation of energy

This same stored chemical energy in the giraffe is taken up by the lion.

Answer:

Products

Explanation:

In an endothermic reaction, energy is taken in. This means that the absorption of energy favours the forward reaction.

Hence for a process; A + B----> C, if energy must be added for the equilibrium to shift towards the right and more of C is produced, then the reaction is endothermic.

Answer:

hope this helps!

Explanation:

This law states that a still object will stay still unless a force pushes or pulls it. A moving object will stay moving unless a force pushes or pulls it. Gravity and friction are forces that constantly push and pull the "stuff" on earth. So, when we roll a ball, it slowly comes to a stop.

Answer:

Autotrophs

Explanation:

They are responsible for the production of food. Root words "auto" for self and "troph" for food.

NaBH4 can be used as a reducing agent to reduce an alkoxide to an alcohol. The mechanism involves a one-electron transfer from NaBH4 to the alkoxide, forming a reduced intermediate, which is then protonated by the solvent to yield the desired alcohol product.

Oi. NaBH4; ii. H3O+.

Oi: NaBH4 can be used as a reducing agent to reduce an alkoxide to an alcohol.

ii: H3O+ can be used as an oxidizing agent to oxidize an alcohol to an aldehyde.

NaBH4 can be used as a reducing agent to reduce an alkoxide to an alcohol. The mechanism involves a one-electron transfer from NaBH4 to the alkoxide, forming a reduced intermediate, which is then protonated by the solvent to yield the desired alcohol product. This reaction is often accompanied by an acid-base reaction between the NaBH4 and the solvent. H3O+ can be used as an oxidizing agent to oxidize an alcohol to an aldehyde. The mechanism involves a one-electron transfer from the alcohol to H3O+, forming an oxidized intermediate, which is then protonated by the solvent to yield the desired aldehyde product. This reaction is often accompanied by an acid-base reaction between the H3O+ and the solvent.

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Answer:

1 C₈H₂₀ + 13 O₂ → 8 CO₂ + 10 H₂O

Explanation:

When balancing chemical equations, looking for the compound that looks the hardest and put a 1 in front of it.

In this case, it would be C₈H₂₀. Put a 1 in front of it.

Now, let's look at the reactants.

C - 8

H - 20

O - 2

Let's look at the products.

C - 1

O - 3

H - 2

To balance the carbons, put 8 in front of CO₂. To balance the hydrogens, put 10 in front of H₂O.

Now to balance the oxygens. There are 16 oxygen atoms in CO₂ and 10 oxygen atoms in  H₂O for a total of 26 oxygen atoms in the products.

To balance the oxygens, put 13 in front of O₂ in the reactants.

The equation is balanced.

Hope that helps.

Answer:8.334×10^-6 moles

Explanation:

a mole is 6.023×10^23

5.02×10^18 ÷ 6.023×10^23=8.33×10^-6

Answer:

Electric current

Hydrogen and oxygen gas

Explanation:

Electrolysis is defined as a method of separation whereby an electric current is introduced into compounds to separate them . The electric current used here is a direct electric current (DC) and it makes the compound to be spit into its' component elements.

Now, in the case of water like it says in the question. Water is a mixture of hydrogen and oxygen gas. Thus, when electric current is passed through water which has an Electrolyte, it makes the water to decompose into its compound elements which are hydrogen and oxygen.

Answer:nothing beats the chemistry between us :) smooth right?

Explanation:I’m pretty sure u have to show the part before the questions so that people can respond to it since there is no info on how to answer the question :p

Cualquier servicio que no tenga que ver con la transacción financiera no es prestado por las instituciones financieras.

Una institución financiera se refiere a cualquier institución que tiene la responsabilidad de realizar transacciones financieras en nombre de individuos u organizaciones.

Las instituciones financieras proporcionan;

Cualquier servicio que no tenga que ver con la transacción financiera no es prestado por las instituciones financieras.

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Answer:

C.0.28 V  

Explanation:

Using the standard cell potential we can find the standard cell potential for a voltaic cell as follows:

The most positive potential is the potential that will be more easily reduced. The other reaction will be the oxidized one. That means for the reactions:

Cu²⁺ + 2e⁻ → Cu E° = 0.52V

Ag⁺ + 1e⁻ → Ag E° = 0.80V

As the Cu will be oxidized:

Cu → Cu²⁺ + 2e⁻

The cell potential is:

E°Cell = E°cathode(reduced) - E°cathode(oxidized)

E°cell = 0.80V - (0.52V)

E°cell = 1.32V

Right answer is:

The PH value of a saturated solution of phenobarbital is,\(p^H=4.88 \approx P^H \times 4.9$\)

A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent. ​The additional solute will not dissolve in a saturated solution.

The amount of solute that can be dissolved in a solvent to form a saturated solution depends on a variety of factors. The most important factors are:

For saturated solution

W= \(1g\), V=\(1000ml\), \(m_{w}\) = \(232.2g\)

Now Molarity = \(\frac{WX1000}{m_{w} V}\) = \(\frac{1X1000}{(23.2)(1000)}\)

Molarity = \(0.0043m\)

Given \(P^{ka}\)=\(7.4\)

Therefore, \(ka =\) antilog \((-7.4)=3.98X10^{-8}\)

\($\left[\mathrm{H}_3 \mathrm{O}^{+}\right]=\sqrt{\mathrm{KaXc}} =\sqrt{3.98 \times 10^{-8} \times 0.0043}=1.30 \times 10^{-5}$ \\Now, $\mathrm{pH}^H=-\log \left(\mathrm{H}_3 \mathrm{O}^{+}\right]=-\log \left(1.30 \times 10^{-\mathrm{E}}\right)=4.88$.\\$\therefore p^H=4.88 \approx P^H \times 4.9$\)

Therefore, the PH value of a saturated solution of phenobarbital is,\(p^H=4.88 \approx P^H \times 4.9$\)

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Answer:

Nuclear Fission is a nuclear reaction or a Radioactive decay progress in which the necleus of an atom splits into two or more smaller, lighter neclei

The total volume should be reported as 1.050 mL.

A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture. The solvent particles will pull the solute particles apart and surround them if the attractive forces between the solvent and solute particles are stronger than the attractive forces holding the solute particles together. The particles of the solute that are enclosed by the solid solute subsequently disperse into the solution. Chemical polarity effects are engaged in the mixing of a solution at a scale that leads to interactions that are unique to solvation.

We add all three volumes

\(0.351+0.350+0.349\)

= 1.050 mL

We added a zero after 1.05 to make three significant digits. So, total volume would be reported as 1.050 mL.

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Step 1 - Understanding the law of mass conservation

In physics, chemistry and biology the law of mass conservation states that no atom is created or destroyed, they are only rearranged in any given physical/chemical/biological process.

Therefore, if all atoms are preserved, the total mass of reactants and products is the same.

Step 2 - Answering the exercise

The melting of an ice cube is a physical process and, as such, is also subjected to the law of mass conservation. Therefore, if 10g of ice melt, 10g of water are produced.

Answer: 10.0g

Answer:

89-91=1 the answer is 1molar mass

The most stable resonance structure if nitrogen is the central atom in the CNO⁻ ion is seen in the first structure in the image attached below.

Resonance structures show the different forms of lewis structure in which a compound can exist whether as a stable resonance or an unstable resonance. It also explains the electronic bonding existing in a polyatomic compound with its bonds and charges.

The structure carrying the negative charge on the most electronegative atom is the most stable structure in resonance structures.

In the given compound CNO⁻, the lewis structure in which the resonance can exist is shown in the image attached below.

The first structure is the most stable because the negative charge is on the most electronegative element (oxygen).

The second structure has a (-2) oxidation state with two non-bonding electron pairs.

The third structure has a positive oxidation charge the electronegative oxygen which also makes it unstable.

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Answer:

12 - x = 20 - 5x

Add 5x on both sides,

12 - x + 5x = 20 - 5x

12 + 4x = 20

Subtract 12 on both sides,

12 - 12 + 4x = 20 - 12

4x = 8

Divide 4 on both sides,

4x / 4 = 8 / 4

x = 2

Hence proved.

Polar bonds do not always result in polar molecules; for example, carbon dioxide has polar bonds but is a nonpolar molecule because its bond polarities cancel out due to its linear geometry.

The statement that all molecules with polar bonds are polar molecules is not entirely correct. While it is true that polar bonds occur between atoms with different electronegativities, giving rise to partial positive and negative charges within the molecule, a molecule can still be nonpolar if the polar bonds cancel out each other's effects.

For example, carbon dioxide has two polar bonds between the carbon atom and each oxygen atom, but the molecule is nonpolar because the arrangement of the atoms is linear, with the polar bonds facing in opposite directions and canceling each other's effect. Similarly, tetrachloromethane has four polar bonds between the carbon atom and each chlorine atom, but the molecule is nonpolar due to its tetrahedral geometry, which results in the polar bonds being arranged symmetrically around the carbon atom.

Therefore, it is essential to consider both the electronegativity difference and the geometry of the molecule to determine whether a molecule is polar or nonpolar.

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The volume of gas when the pressure goes from 1.0 atm to 1.4 atm is 8,571.43 L.

When a car is driven into the river, it will implode due to the change in pressure. We are to calculate the volume of gas when the pressure goes from 1.0 atm to 1.4 atm if the internal volume of the car is 12,000 L.In order to solve the problem, we will use the combined gas law equation. The equation is given as follows;P1V1/T1 = P2V2/T2where P1 is the initial pressure, V1 is the initial volume, T1 is the initial temperature, P2 is the final pressure, V2 is the final volume, and T2 is the final temperature.We will assume that the initial temperature and final temperature are constant, and therefore, we can cancel them from the equation. Thus, the equation becomes;P1V1 = P2V2We can rearrange the equation to solve for V2 as follows;V2 = (P1V1)/P2Substituting the given values, we get;V2 = (1.0 atm * 12,000 L)/1.4 atmV2 = 8,571.43 L.

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