Solutions of citric acid and sodium citrate are combined in equal volume to produce a buffer. Identify the combination that will produce the buffer with the highest buffer capacity. 0.01 MC,H,O,0.1 M Na,H,O, O 0.1 M CH,O,, 0.01 M Na CH.0, O 0.1 MCH,O,, 0.1 M Na CH.0, O 0.01 M C H, 0, 0.01 M Na CH.0

Answer:

7.8286×10^21 particles

Explanation:

atomic mass of potassium = 39.1 u

1 u = 1 g/mol

Potassium (K) = 39.1 g/mol × 2 =  78.2 g/mol

Oxygen (O)     =     16 g/mol × 1  =    16  g/mol

K₂O = 94.2 g/mol

1.224 g / 94.2 g/mol = .013 moles

Avogadro's number = 6.022×10²³

particles = moles x Avogadro's number

particles = .013 moles x 6.022×10^23

particles = 7.8286×10^21 particles

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Antibiotics are effective on bacterial cells. This means they would not work on which two infections from question 1? Common cold and influenza ("flu").

Antibiotics are a type of medication that will fight bacterial infections by killing the bacteria and preventing their growth. It will then affect living microorganisms.

It will then not be effective in viral infections since viruses are not living beings, which will not do anything to them and what will generate is that in the individual who is taking the antibiotics, the bacteria generate antibiotic resistance making it more difficult to eradicate them when it is generated by a bacterial infection.

Therefore, we can confirm that in a common cold and influenza the use of antibiotics is not going to be effective because they are caused by viral agents that will not be eradicated.

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The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M.

Given reaction obeys the rate law, rate=k[A]²[B].

Here, the initial concentration of A= 0.10 M,

initial concentration of B = 0.05 M, and

rate constant, k = 2.0 × 10⁻⁴ M⁻¹s⁻¹

We have to find the concentration of A, after 30 seconds.

To find the concentration of A, we need to know the rate at 0.10 M and 0.05 M. Therefore, we have to calculate the rates at these concentrations.

rate1 = k[A]²[B]

= (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.10 M)²(0.05 M)

= 1.0 × 10⁻⁷ M/srate2

= k[A]²[B] = (2.0 × 10⁻⁴ M⁻¹s⁻¹)(0.09 M)²(0.04 M)

= 6.48 × 10⁻⁸ M/s

Using the integrated rate law for a second-order reaction: [A] = [A]₀ - kt where [A]₀ = initial concentration of A, k = rate constant, and t = time in seconds.

We know [A]₀ = 0.10 M and k = 2.0 × 10⁻⁴ M⁻¹s⁻¹.

Substituting the values in the above equation, we get: [A] = [A]₀ - kt= 0.10 M - (2.0 × 10⁻⁴ M⁻¹s⁻¹)(30 s)≈ 0.0934 M

Therefore, the concentration of A in the vessel after 30 seconds is 0.0934 M.

This question requires us to calculate the concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B].

We are given the initial concentration of A and B and the rate constant of the reaction. To find the concentration of A after 30 seconds, we need to calculate the rates at the initial concentrations of A and B.

Using the integrated rate law for a second-order reaction, we can find the concentration of A at any given time. We substitute the given values in the formula and solve for [A]. We get the concentration of A as 0.0934 M after 30 seconds. This calculation is based on the assumption that no other reaction is important.

The concentration of A after 30 seconds when the given reaction obeys the rate law rate = k[A]²[B]. We use the initial concentration of A and B and the rate constant of the reaction to find the rates at these concentrations. Using the integrated rate law for a second-order reaction, we find the concentration of A after 30 seconds to be 0.0934 M. This calculation assumes that no other reaction is important.

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Answer:  120 Teaspoons

Explanation:  

TS = Teaspoons; R = Recipe ; S=Servings

(2 TS/R)/(10S/R) = (10S/2TS)

(600S)/(10S/2TS) = 120 TS

Hyperconjugation is the interaction between bonds in organic compounds.

Hyperconjugation is the relationship or interaction that exist between multiple bonds molecules and single bond molecules in organic compounds.

Therefore, Hyperconjugation is the interaction between bonds in organic compounds.

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Answer:

A: 2.525 x 10-4 mol

B: 2.583 x 10-4 mol

Explanation:

Part A:

Data Given:

. Temperature of water (H2O) = 21.3°C

Convert Temperature to Kelvin

T = °C + 273

T = 21.3 + 273 = 294.3 K

volume of (H2O) gaseous state = 5.1 mL

Convert mL to liter

1000 mL = 1L

5.1 ml = 5.1/1000 = 0.0051 L

Pressure = 1.2 atm

. no. of moles = ?

Solution

no. of moles can be calculated by using ideal gas formula

PV = nRT

Rearrange the equation for no. of moles

n=PV/RT......... (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm/ mol. K

Now put the value in formula (1) to calculate no. of moles of

n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol-1. K-1 x 294.3 K

n = 0.0061 atm.L / 24.162 L.atm.mol-1

n = 2.525 x 10-4 mol

no. of moles of gas (H2O) = 2.525 x 10-4 mol

Part B:

Data Given:

Temperature of water (H2) = 21.3°C

Convert Temperature to Kelvin

T = "C + 273

T= 21.3 + 273 = 294.3 K

volume of (H2) gas = 5.2 mL

Convert mL to liter

1000 mL = 1 L

5.2 ml = 5.2/1000 = 0.0052 L

Pressure = 1.2 atm

. no. of moles = ?

Solution

no. of moles can be calculated by using ideal gas formula

PV = nRT

Rearrange the equation for no. of moles

n= PV / RT......... (1)

where

P = pressure

V = Volume

T= Temperature

n = Number of moles

R = ideal gas constant

where

R = 0.08206 L.atm/mol. K

Now put the value in formula (1) to calculate no. of moles of

n = 1.2 atm x 0.0052 L/0.08206 L.atm.mol-1. K-1 x 294.3 K

n = 0.0062 atm.L/ 24.162 L.atm.mol-1

n = 2.583 x 10-4 mol

I

no. of moles of gas (H2) = 2.583 x 10-4 mol

We learned that k is adsorbed to negatively charged soil colloids by electrostatic attraction to three types of exchange sites or binding positions. The cation exchange sites are the most readily available to the soil solution.

The binding position that is readily available to the soil solution is the cation exchange sites. This is because the negatively charged soil colloids attract positively charged ions, known as cations, through electrostatic attraction. These cations are then exchanged with other cations in the soil solution, leading to the term "cation exchange sites."

The other two types of exchange sites are the anion exchange sites, which attract negatively charged ions, known as anions, and the inner sphere binding sites, which involve a direct bond between the metal ion and the soil colloid surface. However, the cation exchange sites are the most readily available to the soil solution.

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The unknown mineral is gold because of the similar properties of gold to that unknown mineral.

The unknown mineral is Gold because it has similar properties to the gold. Gold has density of 19.3 grams per cubic centimeter which is same to this unknown mineral. The hardness and mass of the mineral are also similar to the Gold.

So we can conclude that the unknown mineral is gold because of the similar properties of gold to that unknown mineral.

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Answer:

large atoms have Valence electrons further from the nucleus and lose them more readily.

Answer:

Photosynthesis is a phenomenon in which green plants such as algae, fungus etc containing chlorophyll use sunlight as a source of energy to convert carbon dioxide and water present in the atmosphere  to form glucose which is used as plant food and oxygen which is liberated into the atmosphere for breathing.

The chemical equation for photosynthesis is:

\(6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2\)

where carbon dioxide and water are reactants and glucose and oxygen are products formed.

Answer:

The answer is A. An added force of 20 N to the side of the hill

Explanation:

Answer:Its A. An added force of 20 N down the hill, Not D. An added force of 20 N to the side of the hill. The first person meant A and meant to add force of 20 N down the hill.

Explanation:

The mass of ammonia gas used in kg would be  1.02 kg..

Nitric (V) acid and ammonia gas react to form fertilizer according to the following balanced chemical equation:

\(HNO_3 + NH_3 -- > NH_4NO_3\)

From the equation, the ratio of the ammonium nitrate produced to the ammonia gas used is 1:1.

The molar mass of \(NH_4NO_3\) = 14 + 4 + 14 + 48 = 80 g/mol

Mole of 4800 kg  \(NH_4NO_3\) = 4800/80 = 60 mol

Thus, the equivalent amount of ammonia that needs to react will also be 60 mol.

Molar mass of amonnia = 14 + 3 = 17 g/mol

Mass of 60 mol ammonia = 60 x 17

                                           = 1020 grams

1020 grams = 1020/1000

                    = 1.02 kg

In other words, the mass of ammonia gas used would be 1.02 kg.

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a) The combustible gas is hydrogen

b) The sodium is reacting with the ethanol

c) The reaction does not occur

d) Nothing is observed

The experiment that we have here has to do with the burning of the metal. We know that when a metal is burned in air, the oxide of the metal can be formed.

Sodium is a member of the group one elements. When we burn the sodium metal, we can be able to obtain the sodium oxide which is a reactive  metallic oxide.

In this set up, we are carrying out the reaction of sodium and ethanol which is going to produce the hydrogen gas.

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Answer: The hydronium \((H_{3}O^{+})\) concentration of a solution with a pH of 3.60 is 0.56 M.

Explanation:

pH of a substance is the negative logarithm of concentration of hydrogen ions present in it.

It's formula is; pH = - log \([H^{+}]\)

When pH of a solution is 3.60 then its hydronium or hydrogen ion concentration is calculated as follows.

\(pH = - log [H^{+}]\\3.6 = - log [H^{+}]\\concentration of H^{+} = antilog (-3.6)\\= 0.56\)

Thus, we can conclude that the hydronium \((H_{3}O^{+})\) concentration of a solution with a pH of 3.60 is 0.56 M.

The molar mass of the gas is 65.3 g/mol

The number of mole of the gas can be obtained by using the ideal gas equation as illustrated below:

PV = nRT

Divide both side by RT

n = PV / RT

n = (1.04 × 0.854) / (0.0821 × 302)

n = 0.0358 mole

Molar mass = mass / mole

Molar mass = 2.34 / 0.0358

Molar mass of gas = 65.3 g/mol

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Answer:

65.3 g/mol

Explanation:

use the ideal gas law with molar mass formula

M = mRT/PV

m= 2.34 g

V = 0.854 L

T = 302k

P = 1.04

R = 0.0821

just plug those in and solve

Answer:

A composite material is a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components.

Explanation:

you're welcome

The situation in which two people stand on the same side of a large tire, both people pull the tire with equal force is creating an unbalanced force. The force from the opposite side too acts on the tire and make the displacement.

Force is an external agent acting on a body to change its motion or to deform it. The net force acting on the body depends on the direction and magnitude of all  the force acting on it.

If two equal forces acts on the body from the same side they add up together and the net force is their sum. If the forces are acting from the opposite sides, they will cancel each other and is said to be balanced.

Here, two forces from the side is not balanced by a force from the opposite side in case 3 and make a displacement.  Thus, the option 3 is correct.

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Explanation:

Fractional distillation is used to separate crude oil into simpler, more useful mixtures . This method can be used because different hydrocarbons have different boiling points

Hope this help u

The strength of the  digital signal sent using electromagnetic waves weakens as it travels farther form is source.

The electromagnetic waves are waves that are able to travel through space. The electromagnetic waves do not require any single medium for propagation. The are able to move through a vacuum.

However, we know that the distance along which a signal travels affects its strength. In other words if the signal travels through a long range the strength may be weakened.

As such, the strength of the  digital signal sent using electromagnetic waves weakens as it travels farther form is source.

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According to the definition of biofuels reaction, any fuel that is derived from renewable biological resources such as plant or animal matter is considered a biofuel.

Biofuels are typically classified into three categories: first-generation, second-generation, and third-generation biofuels. First-generation biofuels are made from crops such as corn, sugarcane, and soybeans, while second-generation biofuels are made from non-food crops such as switchgrass and wood chips. Third-generation biofuels are made from algae.

Biofuels are fuels that are produced from organic materials, typically plant or animal matter, through biological processes such as anaerobic digestion or fermentation. They are considered a renewable energy source as they can be replenished over time.
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The reaction between hydrogen and nitrogen to form ammonia is: N2 + 3H2 → 2NH3. From the balanced equation, we can see that one molecule of nitrogen reacts with three molecules of hydrogen to form two molecules of ammonia.

Therefore, the limiting reactant in this case is nitrogen since we have fewer nitrogen molecules than hydrogen molecules. To calculate the maximum amount of ammonia that can be produced, we first convert the number of nitrogen molecules to moles:

\(10 \ nitrogen\ molecules\ * (1 \ mole/6.022 \ * 10^{23 }molecules) = 1.66\ * 10^{-23} moles\ of nitrogen.\)

Since one mole of nitrogen reacts with three moles of hydrogen to form two moles of ammonia, the maximum number of ammonia molecules that can be produced is:

\((1.66 * 10^{-23} \ moles\ of\ nitrogen) * (2 \ moles NH3/1\ mole of N2) * (6.022 * 10^{23} molecules/1 mole) = 2.0 * 10^{1 }\ molecules of NH3\)

Therefore, the maximum number of ammonia molecules that can be produced is 20.

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the molarity of the H₂SO₄ solution if it takes 40.0 ml of H₂SO₄ to neutralize 0.364 g of Na₂C0₃ is 0.0858

Calculation of the molarity of  H₂SO₄:

As per equation: H₂SO₄  + Na₂C0₃  ------> Na₂C0₄  +  H₂O  + CO₂

   1 mole of  H₂SO₄ reacts with  1 mole of Na₂C0₃

   1000   ml  1M   H₂SO₄        =    106 g. of Na₂C0₃  

     40  ml  1M  H₂SO₄       =    364 g. of Na₂C0₃

     1000   ml  1M   H₂SO₄   =     9.1 g.of Na₂C0₃

    __________________________________________

  1000 x 0.364

  ----------------------    =  9.1 g. of Na₂C0₃

        40

   Now  106 g. of Na₂C0₃   =    1 mole of  H₂SO₄

  Hence , 9.1 g. of Na₂C0₃  =0.0858 moles of H₂SO₄

  --------------------------------------------------------------------

          9.1 x1

        -------------                = 0.0858 moles of H₂SO₄

            106

0.0858 moles of H₂SO₄

The amount of moles of a solute in a liter of solution is known as its molarity. A capital M is used to represent molarity.

A solution in chemistry is a combination of two or more compounds in which neither ingredient undergoes a chemical transformation. For instance, salt water is a solution that contains both salt and water (the solvent) (the solute). The concentration of a material in a solution is its amount of dissolution. In other words, it refers to the number of ingredients that have been added to your drink. In molarity, concentration is often expressed.

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Answer:

the object will float for a few seconds and most likely fall back down because it still has a little bit of gravity attached or it would float a few inches up but not too high in the air where its out of reach

Explanation:

C. Angiosperms (flowering plants)

Answer:

613.0 g

Explanation:

2 L = 2000 mL

(30.65 g/100 mL)*2000 mL = 613.0 g

Given:

Solution:

Firstly,

We converted L to mL

2 L = 2 × 1000 mL = 2000 mL [ 1 L = 1000 mL ]

Now,

Solute = 30.65/100 × 2000

= 30.65 × 2000 / 100

= 61,300/100

= 613

Answer:

Speed up

Explanation:

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases.

The type of reasoning that makes a statement or prediction based on a general concept is called Inductive reasoning.

Reasoning is defined as the act of thinking in a manner that is sensible or logical.

There are different types of reasoning which includes:

Inductive reasoning is defined as the type of reasoning that involves making a general conclusion from a set of specific observation.

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Answer:the positive ionic radius is smaller than the neutral atomic radius

Explanation:

Answer:The positive ionic radius is smaller than the neutral atomic radius.

Explanation: just took the test