It takes 42.0 min for the concentration of a reactant in a first order reaction to drop from 0.45 M to 0.32 M at 25C. How long will ti take for the reaction to be 90% complete?
A. 13 min
B. 86 min
C. 222 min
D. 284 min

Answer: A

Explanation:

The statement which is correct about the separation techniques is as follows:

Thus, the correct option for this question is A.

The Separation techniques may be defined as all those techniques that can be utilized in order to separate two different states of matter such as liquid and solid from one another.

Physical separation techniques may include magnetic attraction, filtration, evaporation, chromatography, centrifugation, etc. Chemical separation techniques may include distillation, adsorption, oxidation, crystallization, membrane procedures, etc.

Compounds can be separated into their constituents by chemical separation techniques. Evaporation is used to eliminate water from liquid food products and make them dry. Desalination may be defined as a process of eliminating salt from sea water specifically.

Therefore, the correct option for this question is A.

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There are approximately 1.387 moles in 25 grams of water (1) and 134.46 grams in 4.5 moles of Li₂O (2).

1. To calculate the number of moles, we need to divide the given mass of water by the molar mass of water, which is approximately 18.015 g/mol.

Number of moles = 25 grams / 18.015 g/mol

≈ 1.387 moles

Therefore, there are approximately 1.387 moles in 25 grams of water.

2. To calculate the mass in grams, we need to multiply the number of moles by the molar mass of Li₂O, which is approximately 29.88 g/mol.

Mass in grams = 4.5 moles x 29.88 g/mol

≈ 134.46 grams

Therefore, there are approximately 134.46 grams in 4.5 moles of Li₂O.

3. To determine the number of molecules in 23 moles of oxygen, we can use Avogadro's number, which states that there are 6.022 x 10²³ molecules in one mole of any substance. Therefore, for 23 moles of oxygen, we can calculate:

Number of molecules = 23 moles x 6.022 x 10²³ molecules/mole

= 1.38646 x 10²⁵ molecules

So, there are approximately 1.38646 x 10²⁵ molecules in 23 moles of oxygen.

4. To determine the number of moles in 3.4 x 10²³ molecules of H₂SO₄, we can use Avogadro's number. Since one mole contains 6.022 x 10²³ molecules, we can calculate:

Number of moles = (3.4 x 10²³ molecules) / (6.022 x 10²³ molecules/mole)

= 0.564 moles

So, there are approximately 0.564 moles in 3.4 x 10²³ molecules of H₂SO₄.

5. To determine the number of molecules in 25 grams of NH₃, we need to convert grams to moles using the molar mass of NH₃. The molar mass of NH₃ is 17.03 g/mol.

Number of moles = 25 grams / 17.03 g/mol

≈ 1.468 moles

Using Avogadro's number, we can calculate the number of molecules:

Number of molecules = (1.468 moles) x (6.022 x 10²³ molecules/mole)

= 8.831 x 10²³ molecules

So, there are approximately 8.831 x 10²³ molecules in 25 grams of NH₃.

The complete question is:

Answer the following questions:

1) How many moles are in 25 grams of water?

2) How many grams are in 4.5 moles of Li₂O?

3) How many molecules are in 23 moles of oxygen?

4) How many moles are in 3.4 x 10²³ molecules of H₂SO₄?

5) How many molecules are in 25 grams of NH₃ ?

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Answer:

Woah don't cash app whats the question

The Williamson ether synthesis is a method used to synthesize ethers by reacting an alkoxide ion with an alkyl halide. In this case, we have 2-naphthol and 1-bromobutane as the reactants.

To perform the Williamson ether synthesis between 2-naphthol and 1-bromobutane, we need a strong base. The strong base will deprotonate the 2-naphthol to form the alkoxide ion, which will then react with 1-bromobutane.

Here are the steps for the synthesis:

1. Dissolve 2-naphthol and 1-bromobutane in a solvent, such as an alcohol like ethanol.
2. Add a strong base, such as sodium hydroxide (NaOH), to the reaction mixture. The strong base will deprotonate the 2-naphthol, forming the alkoxide ion.
3. The alkoxide ion will then attack the electrophilic carbon atom in the 1-bromobutane molecule, leading to the formation of a new carbon-oxygen bond.
4. The bromide ion is displaced as a leaving group.
5. After the reaction, the product will be a naphthyl ether, which is formed by the combination of 2-naphthol and 1-bromobutane.

It's important to note that the reaction conditions, such as temperature and reaction time, can affect the yield and selectivity of the reaction. Additionally, the choice of solvent and base can also influence the outcome of the synthesis.

In summary, the Williamson ether synthesis between 2-naphthol and 1-bromobutane in strong base involves the deprotonation of 2-naphthol, followed by the nucleophilic attack of the alkoxide ion on 1-bromobutane, resulting in the formation of a naphthyl ether.

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The Williamson ether synthesis is a common method used to prepare ethers by reacting an alkoxide ion with an alkyl halide. In the case of the reaction between 2-naphthol and 1-bromobutane

in strong base, the general procedure would be as follows:

Set up a reaction flask equipped with a reflux condenser and a magnetic stir bar.

Add 2-naphthol (the nucleophile) and an appropriate base, such as sodium hydroxide (NaOH), to the reaction flask.

Dissolve 1-bromobutane (the electrophile) in an appropriate solvent, such as anhydrous ether or dimethyl sulfoxide (DMSO).

Gradually add the dissolved 1-bromobutane to the reaction flask while stirring.

Heat the reaction mixture under reflux for a specific duration to facilitate the reaction.

After the reaction is complete, cool the mixture and transfer it to a separatory funnel.

Wash the organic layer with water to remove any impurities and extract the desired ether product.

Dry the organic layer using an appropriate drying agent, such as anhydrous sodium sulfate (Na2SO4).

Filter the dried organic layer to remove the drying agent and transfer it to a distillation apparatus.

Distill the ether product to obtain a pure sample.

The Williamson ether synthesis allows for the formation of a new ether bond between the oxygen of the 2-naphthol and the carbon of the 1-bromobutane, resulting in the synthesis of a naphthyl alkyl ether compound. The strong base, such as NaOH, helps in generating the alkoxide ion from the 2-naphthol, which then reacts with the electrophilic carbon of the 1-bromobutane to form the desired ether product.

Hence, Williamson synthesis reaction is explained above.

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The ph of a buffer solution with an acid (pka2.9) whose concentration is exactly 10.% that of its conjugate base is 2.9.

A buffer solution is a solution composed of a weak acid and its conjugate base, or vice versa. This type of solution is resistant to changes in pH when small amounts of acid or base are added, making it useful for maintaining a constant environment. Buffers are used in many different applications, including in biochemistry and industrial processes for stabilizing pH, in medical laboratories for blood tests, and in many other industries.

The pH of a buffer solution with an acid (pKa2.9) whose concentration is exactly 10% that of its conjugate base can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([conjugate base]/[acid])

In this case, the concentrations of the acid and its conjugate base are equal, so the equation simplifies to: pH = pKa2.9

Therefore, the pH of this buffer solution is 2.9.

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rank the members of each compound in order of increasing ionic character of their bonds: SeF₄ , TeF₄, BrF₃. arrange compounds as low ionic character < high ionic character are :  BrF₃ <  SeF₄ < TeF₄.

The polarity between the atoms depends on the electronegativity difference. The more the difference in the electronegativity of atoms more the polarity of the atoms. the greater the polarity or the electronegativity between the atoms more will be the ionic character.

Thus, rank the members of each compound in order of increasing ionic character of their bonds: SeF₄ , TeF₄, BrF₃. arrange compounds as low ionic character < high ionic character are :  BrF₃ <  SeF₄ < TeF₄.

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the nurse will administer approximately 1 teaspoon (tsp) of the medication.1 teaspoon (tsp) is approximately equal to 5 mL.

To determine the number of teaspoons the nurse should administer, we need to calculate the equivalent volume of 30 mEq of KCL using the provided concentration of 60 mEq/10 mL.

First, we'll find the ratio of milliequivalents (mEq) to milliliters (mL) in the given concentration:

60 mEq / 10 mL = 6 mEq/mL

Next, we can set up a proportion to find the volume (in mL) that corresponds to 30 mEq:

6 mEq/mL = 30 mEq / X mL

To solve for X, we can cross-multiply:

6X = 30 * 1

6X = 30

X = 30 / 6

X = 5 mL

Since the medication cup is marked in teaspoons, we need to convert 5 mL to teaspoons.

1 teaspoon (tsp) is approximately equal to 5 mL.

Therefore, the nurse will administer approximately 1 teaspoon (tsp) of the medication.

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Answer:

Im assuming a glass of water

Explanation:

there is less water that needs to be heated up

The balanced equation for the combustion of ethane, C2H6, is: C2H6 + 3O2 → 2CO2 + 3H2OTo determine how much heat is produced if 7.0 moles of ethane undergo complete combustion, we need to use the balanced equation and the standard enthalpies of formation of the reactants and products.

The standard enthalpy of formation of a compound is the enthalpy change when one mole of the compound is formed from its constituent elements, with all reactants and products in their standard states (usually at 1 atm and 25°C).The standard enthalpies of formation of the reactants and products in the combustion of ethane are:

ΔHf°(C2H6) = -84.68 kJ/mol

ΔHf°(O2) = 0 kJ/mol

ΔHf°(CO2) = -393.51 kJ/mol

ΔHf°(H2O) = -285.83 kJ/mol

Now we can calculate the heat produced by using the difference between the enthalpies of the products and reactants:

2CO2 + 3H2O - (C2H6 + 3O2)

ΔH = 2(-393.51 kJ/mol) + 3(-285.83 kJ/mol) - (-84.68 kJ/mol + 3(0 kJ/mol))

ΔH = -1560.78 kJ/mol

Therefore, if 7.0 moles of ethane undergo complete combustion, the amount of heat produced will be:

-1560.78 kJ/mol x 7.0 mol

= -10,925.46 kJ or -10,925,460 J.

Note that the negative sign indicates that heat is released by the reaction, which is exothermic.

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The two bonds are most similar in polarity are Pb - O and Na - O.

let us find out the electronegativity difference  between the each pair :

a) C - F = 3.98 - 2.55 = 1.43

   N -F = 3.98 - 3.04  = 0.94

b) Pb - O = 3.44 - 2.33 = 1.11

   Na - O = 2.33 - 0.93 = 1.4

c) H - F = 3.98 - 2.2 = 1.78

   Cl - F = 3.98 - 3.16 = 0.82

d) K - Cl = 3.16 - 0.82 = 2.34

   Ni - Cl = 3.16 - 1.91 = 1.25

e) Mg - F = 3.98 - 1.31 = 2.67

   I - Br = 2.96 - 2.66 = 0.3

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It is essential to conduct experiments to determine the precise effect of adding KOH to the unknown solution. b. KOH is likely to increase the pH the most when added to the solution.

Based on the given pH values, the chemical that is likely to increase the pH the most when added to the solution is KOH (potassium hydroxide). KOH is a strong base and when it dissociates in water, it releases hydroxide ions (OH-) which can react with the hydrogen ions (H+) present in the solution, thus increasing the pH. In this case, KOH is expected to increase the pH significantly. However, please note that the exact change in pH depends on the concentration of the chemical added and the initial pH of the solution. Therefore, it is essential to conduct experiments to determine the precise effect of adding KOH to the unknown solution. In conclusion, b. KOH is likely to increase the pH the most when added to the solution.

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Quinone is an example of a T cell immune system.

These refers to the cells and organs present in organisms which are responsible in providing resistance to germs and infections.

T cells form part of the immune system and provide adaptive immune response through attacking foreign bodies in the body.  Quinone reacting with skin proteins and creating a complex that now triggers an immune response depicts the defense mechanism of T cells.

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Answer:

Sry i accidently clicked on ''SAVE''.

U can remove it or report it...

Explanation:

The mass of silver nitrate needed to prepare 0.125M solution in 250mL of water is 5.372 grams.

The mass will be calculated using the formula -

Molarity = mass/molar mass × volume of solution in litres

The molar mass of silver nitrate is 169.87 grams/mol and volume in litre is 0.25 litre.

Mass = Molarity × volume of solution/molar mass

Mass = 0.125 × 0.25/169.87

Performing division and multiplication on Right Hand Side of the equation

Mass = 5.372 grams

Hence, the required quantity of silver nitrate is 5.372 grams.

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6.07 g of sulfur must react to produce 9.30 L of sulfur dioxide at 740 mm Hg and 125°C.

The given conditions of the reaction can be used to find the number of moles of sulfur dioxide using the ideal gas law, PV = nRT, where P = 740 mmHg, V = 9.30 L, T = 125 + 273 = 398 K, and R = 0.0821 L atm/mol K.

First, we need to convert pressure to atm. 1 atm = 760 mmHg, therefore, P = 740 mmHg/760 mmHg/atm = 0.974 atm

Using the ideal gas law, we have:

0.974 atm × 9.30 L = n × 0.0821 L atm/mol K × 398 K

n = 0.377 mol

The balanced equation for the reaction is:

S + 2O2 → 2SO2

For every 2 moles of SO2 produced, 1 mole of sulfur is required. Therefore, the moles of sulfur required to produce 0.377 mol of SO2 is 0.377/2 = 0.1885 mol.

The molar mass of sulfur is 32.07 g/mol, so the mass of sulfur required is:

0.1885 mol × 32.07 g/mol = 6.07 g

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Answer:

11 and a half

Explanation:

well it luks to be

Answer:

11.5 cm

Explanation:

jsosne92he9dbw9wns9wne9dbe8d

Answer:

Beta Particals

Explanation:

Beta particles are lighter than alpha particles, and they have a greater ability to penetrate other materials. A thin sheet of metal or plastic or a block of wood can stop beta particles.

Iron l is said to have a high permeability. High coercivity, high retentivity, and high permeability materials make up the permanent magnets. An object made of a substance that has been magnetized and produces its own persistent magnetic field is referred to as a permanent magnet.

In contrast to an electromagnet, which is made of a coil of the wire wrapped around a ferrous core and needs an electric current to create a magnetic field, a permanent magnet's magnetism is "always on" and it creates its own permeability magnetic field. A common example is a refrigerator magnet used to the keep notes on the door of the refrigerator.

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Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

A film inside a box can be exposed by beta particles but not alpha particles due to their different penetration capabilities

Alpha particles are much larger and heavier than beta particles, which means that they cannot penetrate through materials as easily as beta particles.

When a film is kept in a box, the box acts as a shield that blocks alpha particles from reaching the film, as the particles cannot pass through the material of the box. However, beta particles are smaller and have less mass, which makes them more capable of passing through materials. Therefore, if there is a source of beta particles outside the box, they can penetrate through the material of the box and reach the film, potentially exposing it.

In summary, the ability of particles to penetrate through materials is dependent on their size and mass, with alpha particles being too large to penetrate through the box and beta particles being small enough to pass through it.

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Answer:

Wait so is there a amount of sentences that you have to write

Answer: D

Explanation:

D - Decomposition of carbonates into oxide and carbon dioxide

A - Combustion reaction. Combustion of methane to form Carbon dioxide and water.

C - Reaction of reactive metal (Na) and water to form hydroxide.

B - No particular name of the reaction. Usually denoted as a synthesis redox reaction.

Answer:CaCO3  CaO + CO2

Explanation: just took it

Answer:

Ver explicacion

Explanation:

Cristalización y disolución de cloruro de sodio: equilibrio físico dinámico

Conversión de oxígeno gaseoso en ozono - equilibrio químico

Condensación y evaporación de un líquido - equilibrio físico dinámico

Reacción entre H2 y 12 para producir Hl - equilibrio químico

Una solución saturada de azúcar - equilibrio físico dinámico

El equilibrio alcanzado en los procesos físicos se llama procesos físicos. El equilibrio físico se llama. Ejemplos de tales procesos físicos incluyen; condensación y evaporación, cristalización y disolución, etc.

Un equilibrio dinámico ocurre en un sistema químico cuando la reacción directa y la reacción inversa se desarrollan a la misma velocidad.

Answer:

Of course the answer is gold

Explanation:

Gold is used for making jewellery and not aluminium,iron or copper

Answer:

copper or gold.

Explanation:

Copper is also a good material for accessories. Even in the ancient times, those who can’t afford gold jewelry wear copper jewelry instead. It offers design flexibility too due to its high ductility.

Answer:

20.05  ×10²³ molecules

Explanation:

Given data:

Mass of hydrogen = 10 g

Number of molecules of ammonia = ?

Solution:

Chemical equation:

3H₂ + N₂       →      2NH₃

Number of moles of hydrogen:

Number of moles = mass / molar mass

Number of moles =  10 g /  2 g/mol

Number of moles =  5 mol

now we will compare the moles of hydrogen and ammonia.

                 H₂            :           NH₃

                  3             :            2

                   5            :           2/3×5 = 3.33 mol

Number of molecules of ammonia:

1 mole contain 6.022 ×10²³ molecules

3.33 mol × 6.022 ×10²³ molecules / 1 mol

20.05  ×10²³ molecules

The entity responsible for activating the disaster plan during a Mass Casualty Incident (MCI) typically varies depending on the jurisdiction and organizational structure in place. However, in most cases, it is the responsibility of the incident commander or the highest-ranking official on the scene to initiate the activation of the disaster plan.

During an MCI, which involves a significant number of casualties that overwhelm the available resources and response capabilities, it is crucial to have a coordinated and organized response. The incident commander, who is usually a representative from the emergency management agency, fire department, or law enforcement, assumes the role of overall command and control.

The incident commander evaluates the situation, assesses the severity of the incident, and determines if the MCI protocols and disaster plan need to be activated. Once activated, the disaster plan outlines the specific actions and procedures to be followed in response to the incident, including resource mobilization, triage protocols, medical treatment priorities, and communication strategies.

By activating the disaster plan, the incident commander initiates the deployment of additional resources, activates mutual aid agreements, coordinates emergency medical services, and ensures effective communication and coordination among all involved agencies and organizations. This helps ensure an efficient and coordinated response to the mass casualty incident and maximizes the chances of saving lives and minimizing further harm.

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You take in that you need to make a decision. Try to notice and define the nature of the decision you must make. This first step is very important.

Decision-making requires the identification and selection of alternatives on the basis of values, linking, requirements, and beliefs. To begin the procedure objectives must be defined, classified, and ordered in the order of their importance. Decision-making involves the recognition and selection of alternatives on the basis of values, preferences, concerns, and beliefs.  Decision-making means selecting a course of action from two or more alternative strategic decision-making (SOM) is of great and growing importance.

So we can conclude that attribute of Decision Making · It is a process of selecting a course of action from among the alternative courses of action.

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