cheyou measure your drug concentration in solution at ten minutes and an hour. you get 2 mg/ml at ten minutes and 12 mg/ml at an hour. what is the equation you would use and what is your dissolution rate? be sure to include units.

The net ionic reaction for MnBr₂ +  Na₂SO₃ is  Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

The net ionic reactiion for MnBr₂ + Na₂SO₃ can be determined using the following steps:
1. Write the balanced molecular equation:
MnBr₂(aq) +  Na₂SO₃(aq) → MnSO₃(s) + 2NaBr(aq)
2. Write the total ionic equation by dissociating the strong electrolytes:
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
3. Identify and remove the spectator ions (those that appear on both sides of the equation):
Mn²⁺(aq) + 2Br⁻(aq) + 2Na⁺(aq) + SO₃²⁻(aq) → MnSO₃(s) + 2Na⁺(aq) + 2Br⁻(aq)
Spectator ions: 2Na⁺(aq) and 2Br⁻(aq)
4. Write the net ionic equation by removing the spectator ions:
Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s)
So, the net ionic reaction for MnBr₂ + Na₂SO₃ is Mn²⁺(aq) + SO₃²⁻(aq) → MnSO₃(s).

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If the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.

An atom is the smallest part of a substance that can take part in a chemical reaction. We know that elements are composed of atoms. The atoms of an element are discretely arranged. Thus, in an element, there are so many atoms of the substance.

In the image that has been shown in the question, the source of the atom as it has been show is an element. Thus, if the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.

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B. ΔH2: energy associated with the separation of LiCl ions

C. ΔH3: energy associated with the formation of water-ion interactions

D. ΔHsoln: the enthalpy of solution

Options A and B refer to the enthalpy change associated with the separation of the ions of lithium chloride and the formation of water-ion interactions, both of them are endothermic processes and would require energy to be added to the system.

Option D refers to the enthalpy of solution which is the enthalpy change associated with the dissolution of a substance in a solvent, and it is exothermic when the enthalpy change is negative.

So, options B, C and D are exothermic and need to be selected.

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Options C and D are associated with the dissolution of lithium chloride which is exothermic.

C. ΔH3: energy associated with the formation of water-ion interactions

D. ΔHsoln: the enthalpy of solution

The dissolution of a solid in a liquid is an exothermic process, it means that heat is released. So, the enthalpy change (ΔH) for the dissolution of lithium chloride will be negative.

ΔH3 represents the energy associated with the formation of water-ion interactions and ΔHsoln represents the enthalpy of the solution, which is the overall enthalpy change for the dissolution process.

Both of these values will be negative for an exothermic process.

ΔH1 and ΔH2 represent the energy associated with the separation of water molecules and LiCl ions respectively, which are not relevant to the dissolution process.

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The nuclear disintegration series of 238-U is the source of radon-222 in soil.

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The average acceleration from the following data points is 20.625 m/s^2.

We know that average acceleration = change in speed / change in time
here,

change in speed = v2-v1

                          = 975-150

                          = 825 m/s

change in time   = t2 - t1

                         = 55 - 15

                         = 40 s

now, putting all the values, average acceleration = 825 / 40

                                                                             = 20.625 m/ s^2 .

what is acceleration?

The rate at which an entity's velocity with regard to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.

The SI unit of acceleration is metre per second square (m/s^2).

An average acceleration the speed at which velocity changes, the evolution of velocity through time, or the instantaneous acceleration ( acceleration at a given moment ) .

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Answer:

Explanation:

Answer:

C) They have different side chains.

Explanation:

Amino acids are the building blocks of proteins and are composed of an amine group (NH2), a carboxyl group (COOH), and a side chain that is unique to each amino acid. While all amino acids have the same basic structure, their side chains or R groups are different and give each amino acid its unique chemical properties. Therefore, the correct answer is that amino acids differ from each other based on their side chains.

Answer:

Fluorine    

Chlorine

Bromine

Iodine

Boiling point increases as you go down the group v11

Explanation:

The elements of Group VII  are the halogens consisting of f fluorine (F), chlorine (Cl), bromine (Br), iodine (I).  All of which are non metals and exists  as diatomic molecules - F2, Cl2, Br2, I2 with  intermolecular attractions between the two molecules of each element held by Van der Waals dispersion force.

Moving down the group, the size of the atoms increases in size from Fluorine, F2 and Chlorine, Cl2 which are gases to Bromine , Br2 which exists as a liquid to solid, Iodine, I2. This attributes to the increasing in Strength of the Van der Waals forces as you go down the group. In order to break the vanderwaals forces , More heat energy is required to change thier states  leading to the increase in  boiling point going down the group.

Fluorine    

Chlorine

Bromine

Iodine

Boiling point increases as you go down the group

Answer:

Explanation:

To calculate the mass of 1.57 moles of iron(III) oxide, we need to know the molar mass of iron(III) oxide, which can be calculated by adding up the atomic masses of all the atoms in one mole of the compound.

The formula for iron(III) oxide is Fe2O3, which consists of two iron atoms and three oxygen atoms.

The atomic mass of iron is 55.845 g/mol, and the atomic mass of oxygen is 15.999 g/mol.

Therefore, the molar mass of Fe2O3 is:

(2 x 55.845 g/mol) + (3 x 15.999 g/mol) = 159.69 g/mol

Now we can calculate the mass of 1.57 moles of Fe2O3 by multiplying the molar mass by the number of moles:

1.57 moles x 159.69 g/mol = 251.05 g

So the mass of 1.57 moles of iron(III) oxide is 251.05 grams.

Answer:

No = Avagardro's number = 6.02 x 10^23

No.of atoms = no.of moles x No x atomicity

= 75.4 x 6.02 10^23 x 1

= 453.908 x 10^23 atoms .

The full IUPAC name for the organic product formed in the reaction between hexan-3-ol and phosphorus tribromide is 3-bromohexane.

The reaction between hexan-3-ol and phosphorus tribromide produces the organic compound 3-bromohexane. Here is the IUPAC substitutive nomenclature for 3-bromohexane:

Prefix: bromo-

Root: hexane

Suffix: -e (indicating a saturated hydrocarbon with no functional groups)

Position of substituent: 3- (indicating that the bromine atom is attached to the third carbon atom in the hexane chain)

Therefore, the full IUPAC name for the organic product formed in the reaction between hexan-3-ol and phosphorus tribromide is 3-bromohexane.

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Chromium has the same oxidation state in both compounds despite the difference in color, the oxidation state of chromium is  +6.

When a molecule, atom, or ion loses electrons during a reaction, this is referred to as oxidation.

When the oxidation state of a molecule, atom, or ion increases, oxidation takes place. When an atom, molecule, or ion's oxidation status changes or more electrons are gained, the process is known as reduction.

An illustration of a reaction is the formation of hydrofluoric acid by the reaction of hydrogen and fluorine gas:

H2 + F2 → 2 HF

Hydrogen is being oxidized and fluorine is being reduced in this process. When stated as two half-reactions, the reaction might be easier to comprehend.

There is no oxygen present at any point in this reaction:

H2 → 2 H+ + 2 e-

F2 + 2 e- → 2 F-

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696.32 mmHg is the final pressure of the gas.

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.

Given data:

\(P_1\) = 720 mmHg              

\(P_2\) = ?

\(n_1\) = 2.5 mol                

\(n_2\) = 3.2 mol

\(V_1\) = 34 L            

\(V_2\) = 45 L

Formula

Combined gas law

\(\frac{P_1 V_1}{n_1} = \frac{P_2 V_2}{n_2}\)

\(P_2\) = 696.32 mmHg

Hence, 696.32 mmHg is the final pressure of the gas.

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The species with the smaller bond angle is ClO₃⁻ (chlorate ion) compared to ClO₄⁻ (perchlorate ion).

Step 1: Identify the central atoms in each species - Cl is the central atom in both ClO₃⁻ and ClO₄⁻.

Step 2: Determine the electron domain geometry - ClO₃⁻ has 4 electron domains (3 bonding and 1 lone pair), which gives it a tetrahedral electron domain geometry. ClO₄⁻ has 4 electron domains (all bonding), also resulting in a tetrahedral electron domain geometry.

Step 3: Determine the molecular geometry - ClO₃⁻ has a trigonal pyramidal molecular geometry due to the presence of one lone pair, while ClO₄⁻ has a tetrahedral molecular geometry with no lone pairs.

Step 4: Compare the bond angles - The presence of a lone pair in ClO₃⁻ causes a smaller bond angle (~109.5°) due to the higher repulsion between the lone pair and bonding pairs compared to ClO₄⁻, which has a larger bond angle of approximately 109.5°.

So, the species with the smaller bond angle is ClO₃⁻.

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almost every lab uses chemicals of some sort, chemical safety rules are a must. Following these policies helps employees avoid spills and other accidents, as well as damage to the environment outside of the lab.

Explanation:

We need to follow these because working in the laboratory is more dangerous and to avoid this we need to Know the precautions and dangers governing the lab to prevent accident

The ratio of octene to oxygen is 1:12.

To determine the ratio of octene (C8H16) to oxygen (O2) in the given reaction, we need to examine the balanced chemical equation. However, the equation you provided does not seem to be balanced. The coefficients for each compound must be determined to achieve a balanced equation before we can calculate the desired ratio.

Assuming you meant the combustion reaction of octene, a balanced equation would be:

C8H16 + 12O2 → 8CO2 + 8H2O

From the balanced equation, we can see that for every 1 mole of octene (C8H16), we require 12 moles of oxygen (O2) to completely react.

This means that for every 1 mole of octene, we need 12 moles of oxygen to fully combust the octene and produce the corresponding amounts of carbon dioxide (CO2) and water (H2O) as shown in the balanced equation.

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Answer: a) No, both are different.

b) Ramesh- 9.9%

  Sarika - 10%

Explanation:

According to the solution prepared by Ramesh,

Mass of sugar he took (Solute) = 10 g

Mass of water he took (Solvent) = 100 g

Thus Mass % of the solution =

According to the solution prepared by Sarika,

Mass of sugar she took (Solute) = 10 g

Mass of Solution she took  = 100 g

Thus Mass % of the solution =

Explanation:

Approximately 78% of the atmosphere is made up of nitrogen gas.

The atmosphere is the thin layer of gases that surrounds the Earth. It's made up of many different types of gases, including nitrogen (78%), oxygen (21%), and trace amounts of other gases like carbon dioxide and helium. Nitrogen, which is an inert gas, does not participate in any chemical reactions or processes in the Earth's atmosphere. Nitrogen, which is an essential component of amino acids, makes up a significant portion of the Earth's atmosphere, including its air. This gas is also used in a variety of industrial processes, including the production of fertilizers, explosives, and semiconductors.

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Answer:

1) Carrying capacity is the maximum number of individuals of a species that an environment can support.

2) Population - all the inhabitants of a particular town, area, or country.

3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.

4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.

Answer:

E. 5.049

Explanation:

Multiply the concentration by volume (in liters) first to get moles of NaOH. Then multiply by the molar mass of NaOH to convert to grams.

0.18 M • 0.7000 L = 0.126 mol NaOH

0.126 mol • 39.997 g/mol = 5.040 g --> The closest answer seems to be e. 5.049 g

Answer:

Units are used to show if a certain calculation is on track.

Explanation:

For example, 5.1 inches is way shorter than 5.9 inches.

Answer:

E: Air is a poor conductor of heat.

Explanation:

hope this helps, love. have a good day

The absence of close atomic particles, made air a poor conductor of electricity. Thus, option E is correct.

The conductors can be described as the elements that has been able to transmit the energy or transfer it from one end to another. The transfer of energy has been mediated with the presence of atomic particles that has been capable to transfer and store the energy.

The given compounds has been the metallic elements, that has been consisted of the atoms. The atom has been mediated with the transfer of energy, and are conductors of heat.

However, there has been absence of sufficient subatomic particles in the air bonded close to each other. Thus, air has been the poor conductor of heat. Hence, option E is correct.

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The best radioactive isotope for age-dating a rock from 50,000 years ago would be Carbon-14 (14C).

Carbon-14 (14C) is the most suitable radioactive isotope for dating materials up to approximately 50,000 years old, making it ideal for age-dating a rock from 50,000 years ago. This is because 14C is formed in the upper atmosphere when cosmic rays interact with nitrogen, and it is incorporated into living organisms through photosynthesis or consumption. After an organism dies, the 14C begins to decay at a known rate, known as the half-life, which is approximately 5730 years. By measuring the remaining amount of 14C in a sample, scientists can determine how long it has been since the organism died and, therefore, date the rock or material containing organic matter to estimate its age. Other radioactive isotopes with longer half-lives, such as Uranium-238 or Potassium-40, are better suited for dating much older rocks or minerals.

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Answer:

The given hydrocarbon is Glycerol

The heat energy absorbed by the water in the experiment according to the calorimeter data is 10450 J

From the question give above, the following data were obtained:

From calorimetry, we understood that heat absorbed is given by the following formula

Q = MCΔT

Inputting the given parameters, we can obtain the heat absorbed by the water as follow:

Q = 100 × 4.18 × 25

Q = 10450 J

Thus, we can conclude that the heat energy absorbed by the water is 10450 J

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Answer: 2.)black

3.)red

4.)yellow

5.) I don't know I am very sorry

6.) I don't know I am very sorry

7.) light blue

8.) purple

9.) dark green

10.)purple

The technical term for a substance made out of two or more elements is mineral. The correct option is D.

A mineral is an inorganic, naturally occurring substance with a crystalline structure and a particular chemical make up. Two or more chemical elements that are bonded together in a particular way make up minerals. Quartz, feldspar and mica are a few examples of common minerals.  Due to their distinctive qualities, minerals are frequently used in industry and technology. Some minerals also have economic value.

Contrarily, an element is a substance that cannot be chemically divided into less complex ones. The quantity of protons in an element's atomic nucleus determines its identity. Oxygen, carbon and gold are a few examples of elements. The correct option is D.

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Since the solution contains 160 g of potassium nitrate in 100 mL of solution, it is supersaturated, which means that it contains more solute than it can hold at the given temperature.

To determine if a solution is saturated, unsaturated, or supersaturated, we need to compare the amount of solute present in the solution to its maximum solubility at the given temperature.

The solubility of potassium nitrate increases with temperature, so we need to know the maximum solubility of potassium nitrate at 70°C to answer the question. According to the solubility table, the maximum solubility of potassium nitrate at 70°C is 121 g/100 mL.

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Answer:

Man-made radiation is generated in range of medical, commercial and industrial activities and natural occuring radiation occurs due to minerals.