what quantity in moles of kcl are there in 50.0 ml of 0.170 m kcl?

Answer:

sunlight is the answer i think

A) Because KOH is a strong base, it totally dissociates in water to create K+ and OH- ions. As a result, the concentration of OH- in solution equals the concentration of KOH. The solution's pOH can be computed as follows:

\(1.12 pOH = -log[OH-] = -log(7.6x10-2)\)

Because pH + pOH = 14, the solution's pH is:

pH = 14 - pOH = 14 - 1.12 = 12.88

B) Calcium hydroxide (\(Ca(OH)_{2}\)) is a strong base that totally dissociates in water to generate \(Ca_{2}\)+ and 2OH- ions. The OH- concentration in the diluted solution is calculated as follows:

\(Ca(OH)_{2}\) moles = concentration x volume = 1.10x\(10-^{2}\) x 14.0x\(10-^{3}\) = 1.54x\(10-^{4}\) mol

Because \(Ca(OH)_{2}\) dissociates into two moles of OH- for every mole of Ca(OH), the total number of moles of OH- in the solution is 2 x 1.54x\(10-^{4}\) = 3.08x\(10-^{4}\) mol.

After dilution, the total volume of the solution is 580.0 + 14.0 = 594.0 mL. As a result, the OH- concentration in the diluted solution is:

[OH-] = 3.08 x \(10-^{4}\) mol/0.594 L = 5.19 x \(10-^{4}\) M

C) To compute the concentration of hydroxide ions in the mixed solution, we must first know the moles of hydroxide ions present.

This is accomplished by calculating the moles of hydroxide ions contributed by each separate solution and then adding them all together.

In the case of :

OH- ion moles = concentration volume = 1.50\(10-^{2}\) mol/L 0.015 L = 2.25 \(10-^{4}\) mol

In the case of NaOH:

OH- ion moles = concentration volume = 7.6 \(10-^{3}\) mol/L 0.036 L = 2.736 \(10-^{4}\) mol

Total OH- ion moles = 2.25 \(10-^{4}\) mol + 2.736 \(10-^{4}\) mol = 4.986 \(10-^{4}\) mol

The concentration of hydroxide ions in the mixed solution can now be calculated:

15 mL + 36 mL = 51 mL = 0.051 L total volume of the combined solution

[OH-] = moles of OH- ions divided by total volume of mixed solution

(4.986 10-4 mol) / (0.051 L) = 9.77 10-3 M [OH-]

As a result, the hydroxide ion concentration in the mixed solution is

9.77 × 10-3 M.

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The atomic radius decreases as you move across a period (from left to right) because the number of protons increases and pulls the electrons in closer to the nucleus.

Atomic radius is the distance from the nucleus of an atom to the outermost electrons. The atomic radius decreases as you move from left to right in a period. This decrease is due to the increase in the nuclear charge and the shielding effect. Electrons are attracted to the positive charge of the nucleus but are also repelled by the other electrons in the atom. The shielding effect occurs when the inner electrons shield the outer electrons from the nuclear charge.This results in a smaller atomic radius.

As the number of protons increases, the nucleus becomes more positively charged, which attracts the electrons more strongly. The electrons are pulled in closer to the nucleus, making the atomic radius smaller. Therefore, option b, The number of protons increases and pulls the electrons in closer to the nucleus is correct.

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When mixed in appropriate amounts, each of the following mixtures can produce an effective buffer solution EXCEPT:
c) NaOH and NaF

Explanation:
A buffer solution is a solution that can resist changes in pH when small amounts of an acid or a base are added to it. To form an effective buffer solution, you need a weak acid and its conjugate base, or a weak base and its conjugate acid.

a) NaH2PO4 and Na2HPO4: These form a buffer solution, as NaH2PO4 is a weak acid (\(H2PO4-\)) and Na2HPO4 is its conjugate base \((HPO4^2-)\).

b) NaHCO3 and Na2CO3: This also forms a buffer solution, with NaHCO3 as the weak acid (HCO3-) and Na2CO3 as its conjugate base \((CO3^2-)\).

d) Na2HPO4 and Na3PO4: This forms a buffer solution, as Na2HPO4 is the weak acid (HPO4^2-) and Na3PO4 is its conjugate base \((PO4^3-)\).

e) HCl and NaH2PO4: This forms a buffer solution, as HCl donates a proton to NaH2PO4, forming the weak acid \((H2PO4-)\) and its conjugate base \((HPO4^2-)\).

However, in option c, NaOH is a strong base and NaF is a salt of a weak acid (HF) and a strong base (NaOH). Mixing these two will not result in an effective buffer solution, as a strong base cannot effectively maintain a stable pH.

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Answer:

Earths rotation

Explanation:

Answer:

because if there was not four diferent season we would not have a day or a night because we would not be moving

Explanation:

The type of mixture you are referring to, where the solid settles out of the mixture over time, is called a heterogeneous mixture.

In a heterogeneous mixture, the components are not uniformly distributed, and the particles are large enough to eventually settle due to gravity.

1. Heterogeneous mixtures consist of two or more components that are physically combined but not chemically combined. They can be separated by physical means.

2. In these mixtures, the particles of one component are larger than the particles in a solution, which allows them to settle out over time due to the force of gravity.

3. An example of a heterogeneous mixture is a suspension, where solid particles are dispersed in a liquid medium. A common example of a suspension is orange juice with pulp, where the solid pulp particles will eventually settle to the bottom of the container if left undisturbed.

4. Another example of a heterogeneous mixture is sand and water, where the sand will eventually settle to the bottom if the mixture is allowed to sit undisturbed.

5. In contrast, a homogeneous mixture, like a solution, has a uniform composition throughout, and the particles are too small to settle out over time. An example of a homogeneous mixture is salt dissolved in water.

In conclusion, the type of mixture where the solid settles out over time is a heterogeneous mixture. This occurs because the particles are large enough to be affected by gravity and will eventually settle out due to this force.

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When 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced, based on the balanced chemical equation and stoichiometry.

To determine the amount of aluminum hydroxide that can be produced when 156.32 g of barium hydroxide is reacted, we need to consider the balanced chemical equation for the reaction and use stoichiometry.

The balanced chemical equation for the reaction is:

Ba(OH)2 + 2AlCl3 → 2Al(OH)3 + 3BaCl2

From the balanced equation, we can see that for every 1 mole of Ba(OH)2, 2 moles of Al(OH)3 are produced.

First, we need to calculate the number of moles of barium hydroxide (Ba(OH)2) in 156.32 g:

Molar mass of Ba(OH)2 = (137.33 g/mol + 2(16.00 g/mol + 1.01 g/mol)) = 171.34 g/mol

Moles of Ba(OH)2 = mass / molar mass = 156.32 g / 171.34 g/mol = 0.911 mol

Now, using the stoichiometry of the balanced equation, we can determine the moles of aluminum hydroxide (Al(OH)3) produced:

Moles of Al(OH)3 = 2 × Moles of Ba(OH)2 = 2 × 0.911 mol = 1.822 mol

Finally, to convert the moles of aluminum hydroxide to grams, we need to multiply by the molar mass of Al(OH)3:

Molar mass of Al(OH)3 = (26.98 g/mol + 3(16.00 g/mol + 1.01 g/mol)) = 78.00 g/mol

Mass of Al(OH)3 = Moles of Al(OH)3 × molar mass = 1.822 mol × 78.00 g/mol = 142.34 g

Therefore, when 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced.

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Answer:clean up the area

Explanation:

Answer:

Okay well simply drop it from one inch on to the ground and it won't break and you could put it into a basket with bubble wrap.

Explanation:

Well if you wrap the egg into bubble wrap a few times them put it into a basket (its your choice) then it won't break because the bubble wrap will just pop a few times but sometimes it depends on where you are dropping it from.

Have a blessed day bye! ;)

Answer:

The number of nitrogen molecules inside of berylluim nitrite are 5 cells.

Explanation:

The correct option is D as when sterilizing laboratory equipment with ethanol and a flame, neither option A nor option C should be done.

To reduce the chance of accident or fire when sterilizing lab equipment using ethanol and flame, it is important to follow the correct safety procedures. It is important to keep the alcohol completely away from the flame, not just as far away as possible. When exposed to an open flame, even small amounts of vapor from ethanol can catch fire.

It is also unwise to point the tip of the sterilizing tool upwards as given in option C. Any leftover ethanol may collect at the tip of the tool if it is held with the tip up, which increases the chance of flaring or igniting when it comes in contact with the alcohol.

Therefore, the correct option is D.

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Answer:

B : 4.6 billion years

Credits go to the person above me.

;)

Explanation:

EDGE 2021

The sun is about 4.6 billion years old. Therefore, option (B) is correct.

The Sun is made primarily of the elements hydrogen and helium. They account for 74.9% and 23.8% mass of the Sun in the photosphere. All heavier elements, called metals account for less than 2% of the mass, with oxygen (<1%), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant.

The hydrogen and helium in the Sun would have been produced by Big Bang nucleosynthesis and the heavier elements were produced by former generations of stars before the Sun was formed.

The amount of helium and its location within the Sun has gradually changed over the past 4.6 billion years. The proportion of helium has raised from about 24% to 60% due to fusion, and some of the He and heavy elements have settled from the photosphere toward the center due to gravity.

Therefore, the age of the sun is about 4.6 billion years.

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The anticodons corresponding to the codons on the mRNA (from part A) is 5' CGA - AAA - GUU 3'.

Anticodons are nucleotide sequences on tRNA molecules that are complementary to the codons found on mRNA molecules.

The anticodons on tRNA molecules determine the amino acid that is carried by the tRNA.

Just like codons, anticodons occur in triplets of nucleotide sequences.

Considering the codons on the mRNA molecule:

3’ GCT | TTT | CAA | AAA ’5

The complementary anticodon will be:

5' CGA - AAA - GUU 3'

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According to the atomic radius, the largest atom or ion in each grouping are – \(S^2^-\), \(Mg\) , \(Sb\) , \(Ca\) , \(Na\) .

A measure of the size of an atom is the atomic radius of a chemical element, which is normally the average distance between the core of the nucleus and the outermost isolated electron. There are several non-equivalent descriptions of atomic radius since the border is not a clearly defined physical object.

Since the net nuclear charge steadily rises as a result of higher electron attraction to the nucleus, the radius of atoms decreases across a period. However, as the number of shells in each atom grows along the group, the atomic radius increases.

Neutral atoms typically become larger down a group and smaller across a period. The radius of a neutral atom increases or decreases as it acquires or releases an electron, becoming an anion or cation, respectively.

In the given groupings, the size of the atoms and ions according to the atomic radius is as follows:

\(S^2^- > S > Cl\)

\(Mg > Al > Al^3^+\)

\(Sb > Se^2^- > Se\)

\(Ca > K^+ > Ca^2^+\)

\(Na > Be > Be^2^+\)

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Answer: acid rain

Explanation: Acid rain is one way in which rocks can be chemically weathered. It can harm forests and crops, damage bodies of water, and contribute to the damage of statues and buildings. In this activity you will simulate the chemical weathering of limestone, which is a soft, sedimentary rock that reacts easily to acid rain.

Answer:

Valence electrons increase as you go across the table (by periods)

Orbital Shells increase as you go down the table (rows)

Answer:

Yes

Explanation:

Answer:

flow of electrons in a circuit or electrical system.

more a electrical system

Explanation:

An electric current  is it

Answer:

E = 0.994 J

Explanation:

Given that,

Total no of photons, \(n=1.5\times 10^{13}\)

The wavelength of gamma radiation, \(\lambda=3\times 10^{-12}\ m\)

We need to find the total energy in given no of photons. The formula for the energy of a photon is given by :

\(E=\dfrac{hc}{\lambda}\)

For n photons,

\(E=\dfrac{nhc}{\lambda}\\\\E=\dfrac{1.5\times 10^{13}\times 6.63\times 10^{-34}\times 3\times 10^8}{3\times 10^{-12}}\\\\=0.994\ J\)

So, the total energy is 0.994 J.

Answer:

The different types of radiation are defined by the the amount of energy found in the photons. Radio waves have photons with low energies, microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and, the most energetic of all, gamma-rays.Explanation: hope this helps god bless you

1. Combustion reaction

2. Single displacement reaction

3. Neutralization reaction

4. Synthesis reaction

5. Decomposition reaction

6. Synthesis reaction

There are different types of chemical reactions. The type of reaction that corresponds to each chemical equation as shown in the image respectively are:

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Answer:

16475.5 calories.

Explanation:

The following data were obtained from the question:

Mass (M) = 415 g

Initial temperature (T1) = 25.5 °C

Final temperature (T2) = 65.2 °C

Specific heat capacity (C) = 1 cal/g°C

Heat (Q) required =?

Next, we shall determine the change in temperature of the water. This can be obtained as follow:

Initial temperature (T1) = 25.5 °C

Final temperature (T2) = 65.2 °C

Change in temperature (ΔT) =.?

Change in temperature (ΔT) = T2 – T1

Change in temperature (ΔT) = 65.2 – 25.5

Change in temperature (ΔT) = 39.7 °C

Finally, we shall determine the heat required to raise the temperature of the water as follow:

Mass (M) = 415 g

Specific heat capacity (C) = 1 cal/g°C

Change in temperature (ΔT) = 39.7 °C

Heat (Q) required =?

Q = MCΔT

Q = 415 × 1 × 39.7

Q = 16475.5 calories.

Therefore, the heat required to raise the temperature of the water is 16475.5 calories.

A mass of 12.5 grams of \(Na_2S_2O_3\) is needed to dissolve 4.7 g of AgBr in a solution volume of 1 L.

The balanced equation for the dissolution of AgBr is:

AgBr (s) ↔ \(Ag^+\) (aq) + \(Br^-\) (aq)

The solubility product expression for AgBr is:

Ksp =\([Ag^+][Br^-]\)= 3.3 x \(10^{-13}\)

The reaction between \(Ag^+\) and \(S_2O_3^{2-}\) is:

\(Ag^+\) (aq) + 2 \(S_2O_3^{2-}\) (aq) ↔ \([Ag(S_2O_3)_2]^{3-}\) (aq)

The reaction quotient for \([Ag(S_2O_3)_2]^{3-}\) is:

Kq = [\(Ag^+\)]\([S_2O_3^{2-}]^2\) / \([Ag(S_2O_3)_2]^{3-}\) = 4.7 x \(10^{13}\)

We can use the solubility product expression to find the concentration of \(Ag^+\) in the solution:

[\(Ag^+\)] = Ksp / \([Br^-]\) = 3.3 x \(10^{-13}\) / (4.7 g / 187.77 g/mol / 1 L) = 1.64 x \(10^{-10}\)M

We can then use the reaction quotient to find the concentration of \(S_2O_3^{2-}\) in the solution:

\([S_2O_3^{2-}]\) = √(Kq \([Ag(S_2O_3)_2]^{3-}\) / \([Ag^+]\)) = √(4.7 x \(10^{13}\) / 1.64 x \(10^{-10}\)) / 2 = 7.9 x \(10^{-2}\) M

Finally, we can use the concentration of \(S_2O_3^{2-}\) to find the mass of \(Na_2S_2O_3\) needed to dissolve the AgBr:

mass = concentration x volume x molar mass = 7.9 x \(10^{-2}\) M x 1 L x 158.11 g/mol = 12.5 g

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False. During the current COVID-19 outbreak, brands in the United States have largely reduced or altered their event sponsorships.

The respiratory symptoms that COVID-19 most frequently produces can resemble those of a cold, the flu, or pneumonia. More than just your lungs and respiratory system could be affected by COVID-19. The condition may also affect other areas of your body. The majority of COVID-19 sufferers have minor symptoms, while a small number develop serious illness.

The majority of virus-infected individuals will experience mild to severe respiratory disease and will recover without the need for special care.

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The t-shirt is made of natural materials and some synthetic materials made from natural materials.

We know that there are various types of fabrics. These fabrics may be natural or synthetic, the natural materials include cotton. Polyester and rayon are synthetic fibers that are made from naturally occurring materials.

Thus the statement that is true about the cloth is that; the t-shirt is made of natural materials and some synthetic materials made from natural materials.

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Answer:

Lots of bad things would happen

Explanation:

People would lose their jobs

People would fall out of contact (no phones)

It would be pretty dark (no streetlights)

You would have to learn everything by book or asking someone

ect.

Answer: My life would change drastically.

Explanation:

This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.

In the given redox reaction 2Cr (s) + 3Sn2+ (aq) → 2Cr3+ (aq) + 3Sn (s), chromium (Cr) is being oxidized from Cr to Cr3+ while tin (Sn) is being reduced from Sn2+ to Sn.

To design a galvanic cell based on this reaction, we need to create a setup that allows the transfer of electrons from the oxidation half-reaction (anode) to the reduction half-reaction (cathode).

Anode half-reaction: 2Cr (s) → 2Cr3+ (aq) + 6e-

Cathode half-reaction: 3Sn2+ (aq) + 6e- → 3Sn (s)

Experimental setup:

- Anode: Place a solid piece of chromium (Cr) in a container. This is where the oxidation half-reaction will occur.

- Cathode: Place a solid piece of tin (Sn) in a separate container. This is where the reduction half-reaction will occur.

- Electrolyte solution: Add a solution containing Sn2+ ions (e.g., SnCl2) that will allow the flow of ions between the anode and cathode.

Direction of electron flow: Electrons will flow from the anode (Cr) to the cathode (Sn).

Direction of ion flow: Sn2+ ions will migrate from the electrolyte solution towards the cathode (Sn), while Cr3+ ions will migrate from the electrolyte solution towards the anode (Cr).

Sign of each electrode:

- Anode (Cr): Negative electrode (-)

- Cathode (Sn): Positive electrode (+)

- Anode: Chromium (Cr) is the anode where oxidation occurs.

- Cathode: Tin (Sn) is the cathode where reduction occurs.

- Electrons flow from the anode to the cathode.

- Sn2+ ions migrate towards the cathode, while Cr3+ ions migrate towards the anode.

- The anode (Cr) is negatively charged (-), and the cathode (Sn) is positively charged (+).

The designed galvanic cell for the given redox reaction includes an anode (Cr), a cathode (Sn), and an electrolyte solution containing Sn2+ ions. Electrons flow from the anode to the cathode, while Sn2+ ions migrate towards the cathode and Cr3+ ions migrate towards the anode. The anode (Cr) is negatively charged (-), and the cathode (Sn) is positively charged (+).

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Yes, 32 fluid ounces (oz) is equivalent to 1 quart (qt) in the US customary unit system.

A fluid ounce is a unit of measurement for liquid volume, while a quart is a unit of measurement for dry or liquid volume. The conversion factor between ounces and quarts is 32, because one quart is equal to 32 fluid ounces. This relationship is defined by the fact that a quart is equal to 32 fluid ounces.

In the US customary unit system, the quart is defined as being equal to one fourth of a gallon, which is equal to 2 pints. The fluid ounce, on the other hand, is defined as 1/128 of a gallon. To convert between fluid ounces and quarts, we can use the conversion factor of 32. For example, if we want to convert 64 fluid ounces to quarts, we can divide 64 by 32, and we get 2 quarts.

In summary, 1 quart is equal to 32 fluid ounces and can be converted by dividing the number of fluid ounces by 32.

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