Many common things you use regularly are colloids except.......
-milk
-hair
-spray
-paint
-alloy

Answer:

3, 2, 1, 6

Explanation:

Let's do some algebra lol

Let's call coefficient for Cu(NO3)2 "a"

Let's call coefficient for K3PO4 "b"

Let's call coefficient for Cu3(PO4)2 "c"

Let's call coefficient for KNO3 "d"

Cu3(PO4)2 has 3x as many moles of Cu compared to Cu(NO3)2, so we know that 3c = a

Cu(NO3)2 has 2x as many moles of NO3 compared to KNO3, so we know that 2a = d

Repeat this process for K and PO4 --> you get equations 3b = d and 2c = b respectively

2a = d = 3b = d so 2a = 3b, let's see if a = 3, b = 2 works

plug a and b into other two equations --> c = 1, d = 6

these are all whole numbers so it works! (if they're not whole numbers than multiply every coefficient by their LCM to make it whole)

so your coefficients for each of them are 3, 2, 1, 6

We are unable to give the mass of the conjugate a numerical value without knowing the precise conjugate that was employed.

We must apply the equation for estimating the pH of a buffer solution to estimate the mass of the solid conjugate:

pH equals pKa plus log([A-]/[HA])

Finding the [A-] and [HA] concentrations comes first. Since we are aware that the solution has a 40 mL volume, we can write:

[HA] = [A-] = conjugate moles / solution volume

The Henderson-Hasselbalch equation must then be used to determine how many moles of conjugate are present:

pH equals pKa plus log([A-]/[HA])

4.45 = log(1/1) + pKa

pKa = 4.45

We can now enter the predetermined values:

4.45 is equal to 4.45 plus log(moles of conjugate / 0.04 L).

Calculating the conjugate moles

moles of conjugate = 0.04 L x 1 M / log(moles of conjugate / 0.04 L) = 0 moles of conjugation

Using the molar mass of the conjugate, we can finally determine its mass:

mass is determined by multiplying the number of moles by the molar mass.

mass = molar mass x 0.04 moles.

We are unable to give the mass of the conjugate a numerical value without knowing the precise conjugate that was employed.

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Answer:

8. 1.52 x 10^24 molecules

9. 29206 g

10. 3791.97 g

Explanation:

8. Molecular mass of C14H18N2O5 = 294.3 g/mol

745 g / 294.3 g/mol = 2.53 moles

1 mole has 6.022 x 10^23 molecules

=> 2.53 x 6.022 x 10^23 = 1.52 x 10^24 molecules

9. 1 mole of Fe₂(SO3)3 has 6.022 x 10^23 molecules

so 5 x 10^25/6.022 x 10^23 = 83.0 moles

1 mole of Fe₂(SO3)3 is equal 351.88g

so 83.0 x 351.88 = 29206 g

10. Molar mass of Ba3(PO4)2 is 601.9 g

so 6.3 x 601.9 = 3791.97 g

We need to add 100 mL (0.1 liter) of the 10 M solution to 900 mL (0.9 liter) of solvent to make 1 liter of a 1 M solution. Option C is correct.

To make a 1 liter solution of 1 M concentration, we need to dilute the 10 M solution by a factor of 10.

The dilution factor is the ratio of the final volume to the initial volume, which is 1 liter / 0.1 liter = 10.

So, we need to add 1 part of the 10 M solution to 9 parts of solvent (usually water) to make a total of 10 parts, which will result in a 1 M solution.

Therefore, we need to add 100 mL (0.1 liter) of the 10 M solution to 900 mL (0.9 liter) of solvent to make 1 liter of a 1 M solution.

Hence, C. 100 mL is the correct option.

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--The given question is incomplete, the complete question is

"How much of a 10 M solution is needed to make 1 liter of a 1 M solution? A) 1 mL B) 10 mL C) 100 mL D) 1000 mL​."--

The pH of 1. 0 L of the solution on addition of 30. 0 mL of 1. 0 M HCl to the original buffer solution will be 12.50.

The reaction that occurs when HCl is added to the buffer solution is:

HCl + NH₃ → NH₄⁺ + Cl⁻

The HCl reacts with NH₃ to form NH₄⁺ and Cl⁻. This will cause the concentration of NH₄⁺ in the buffer to increase and the concentration of NH₃ to decrease. However, since we started with a buffer solution, it will still be able to resist changes in pH.

To solve this problem, we will use the Henderson-Hasselbalch equation:

pH = pKb + log([NH₄⁺]/[NH₃])

where [NH₄⁺] is the concentration of the ammonium ion and [NH3] is the concentration of ammonia.

Calculate the moles of HCl added

The volume of HCl added is 30.0 mL = 0.0300 L. The concentration of HCl is 1.0 M, so the moles of HCl added are:

moles of HCl = concentration x volume = 1.0 M x 0.0300 L = 0.0300 moles

Calculate the new concentrations of NH₄⁺ and NH₃

The moles of NH₄⁺ and NH₃ in the original buffer solution can be calculated as:

moles of NH₄⁺ = 0.20 M x 1.0 L = 0.20 moles

moles of NH₃ = 0.50 M x 1.0 L = 0.50 moles

When HCl is added, it reacts with NH₃ to form NH₄⁺ and Cl⁻. The amount of NH₄⁺ produced is equal to the amount of HCl added, since the reaction is 1:1. Therefore, the new concentration of NH₄⁺ is:

[NH₄⁺] = moles of NH₄⁺ / (volume of buffer + volume of HCl added)

[NH₄⁺] = 0.20 moles / (1.0 L + 0.0300 L)

[NH₄⁺] = 0.196 M

The new concentration of NH₃ can be calculated using the buffer equation:

[NH₃] = Ka x [NH₄⁺] / [H⁺]

where Ka is the equilibrium constant for the reaction NH₄⁺ + H₂O → NH₃ + H₃O⁺, which is equal to the acid dissociation constant of NH₃, Kb. Since pKb is given as 4.75, we can calculate Kb:

Kb = 10^(-pKb) = [tex]10^{-4.75}[/tex]  = 1.78 x 10⁻⁵

Substituting the values we have:

[NH3] = Kb x [NH₄⁺] / [H⁺]

[NH3] = 1.78 x 10⁻⁵ x 0.196 M / [tex]10^{-pH}[/tex]

[NH3] = 3.49 x 10⁻⁶ / [tex]10^{-pH}[/tex]

Calculate the new pH of the buffer

Substituting the values we have into the Henderson-Hasselbalch equation:

pH = pKb + log([NH₄⁺]/[NH₃])

pH = 4.75 + log(0.196 M / (3.49 x 10⁻⁶ / [tex]10^{-pH}[/tex])))

Simplifying and solving for pH:

pH = 4.75 + log(5.61 x 10⁷) + log([tex]10^{pH}[/tex])

pH = 4.75 + 7.75 + pH

pH = 12.50

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The planet being described is Uranus.

Uranus is the seventh planet from the sun in our solar system, and it is known for its distinctive greenish-blue color. It is a gas giant planet, similar in composition to Jupiter and Saturn, and it is much larger than Earth, with a diameter of about 51,118 km.

One of the most unique features of Uranus is its axis of rotation, which is tilted at an angle of about 98 degrees relative to its orbit around the sun. This means that instead of spinning upright like most other planets, Uranus appears to be rolling on its side. As a result, its seasons are much more extreme than those of other planets, with each pole experiencing 42 years of continuous daylight followed by 42 years of continuous darkness.

Uranus takes about 84 years to complete one orbit around the sun, which means that it spends roughly 7 years in each zodiac sign. This long orbital period, combined with its distance from Earth, means that it was not discovered until relatively recently in human history. It was first observed by the astronomer William Herschel in 1781, and it was named after the ancient Greek deity of the sky.

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Answer:  Time = Distance ÷ Speed

a. The rate law for the reaction [tex]2Cl_{2}O_{5}[/tex](g) → [tex]2Cl_{2}[/tex](g) + [tex]5O_{2}[/tex](g) is rate = k[[tex]Cl_{2}O_{5}[/tex]]2

b. The rate constant is k = 0.0489 [tex]M^{-2}/ms^{-1}[/tex].

To write the rаte lаw for this reаction, we need to check how the rаte of the reаction chаnges for the chаnge in the concentrаtion of the reаctаnts or products. To get the rаte of the reаction, we need to find out the chаnge in concentrаtion per unit of time. So, the initiаl rаte of reаction (r) will be given by:

r = {Δ[[tex]Cl_{2}O_{5}[/tex]]/Δt}

where Δ[[tex]Cl_{2}O_{5}[/tex]] is the chаnge in concentrаtion аnd Δt is the chаnge in time.

Аs per the аbove formulа, the initiаl rаte of the reаction is:

r = {(0.900 - 0.506)/(10 - 0)} M/ms

= 0.0397 M/ms

Аs per the stoichiometry of the reаction, 2 moles of [tex]Cl_{2}O_{5}[/tex] produces 2 moles of [tex]Cl_{2}[/tex] аnd 5 moles of [tex]O_{2}[/tex]. Thus, the rаte lаw for the given reаction is:

rаte = k[Cl2O5]2

Here, the rаte constаnt is k.

Now, putting the given vаlues in the rаte lаw аnd solving for k:

k = rаte/[[tex]Cl_{2}O_{5}[/tex]]2

Now, the initiаl rаte of the reаction, rаte = 0.0397 M/ms

Аnd the concentrаtion of [tex]Cl_{2}O_{5}[/tex] аt the beginning of the reаction, [[tex]Cl_{2}O_{5}[/tex]] = 0.900 M

So,

k = 0.0397/(0.900)2

= 0.0489 [tex]M^{-2}/ms^{-1}[/tex]

Thus, the rаte lаw for the given reаction is rаte = k[[tex]Cl_{2}O_{5}[/tex]]2 аnd the rаte constаnt is k = 0.0489 [tex]M^{-2}/ms^{-1}[/tex].

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The resulting solution is a homogeneous mixture of Na+, NO3^-, NH4+, and Cl^- ions surrounded by water molecules.

When solutions of sodium nitrate (NaNO3) and ammonium chloride (NH4Cl) are mixed, the resulting solution contains the ions Na+, NO3^-, NH4+, and Cl^-. All of these ions are soluble in water, so the solution remains clear and homogeneous. On a molecular scale, the Na+ ions are surrounded by water molecules, as are the NO3^- ions, NH4+ ions, and Cl^- ions. This is known as hydration, and it is the reason why these compounds are soluble in water. The ions are free to move around in the solution, which allows them to conduct electricity.

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The correct answer is None of the other answers.  According to Graham's Law of Effusion, the rate of effusion of a gas is inversely proportional to the square root of its molar mass. This means that a gas with a lower molar mass will effuse faster than a gas with a higher molar mass.

The equation for Graham's Law of Effusion is:
Rate of effusion of gas 1/Rate of effusion of gas 2 = √(Molar mass of gas 2/Molar mass of gas 1).

In this case, we are given the rate of effusion of oxygen gas (12.7 minutes) and asked to find the rate of effusion of argon gas.
The molar mass of oxygen gas is 32 g/mol and the molar mass of argon gas is 40 g/mol.

Plugging in the given values into the equation, we get:
Rate of effusion of argon/12.7 minutes = √(32 g/mol/40 g/mol)
Cross-multiplying and solving for the rate of effusion of argon, we get:
Rate of effusion of argon = 12.7 minutes × √(32 g/mol/40 g/mol) = 11.3 minutes.

Therefore, the approximate time it would take for 1.0 L of argon gas to effuse is 11.3 minutes. This is not one of the answer choices, so the correct answer is None of the other answers.

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You must compare the total amount of oxygen atoms on the reactant and product sides of the chemical equations in order to determine whether the oxygen atoms are evenly distributed on both sides.

Because matter cannot be generated or destroyed, there must be an equal amount of atoms of each element on both sides of the equation. Coefficients are the only variables that can be altered while balancing equations. An equation cannot be balanced by changing the subscripts in a chemical formula.

Reactant side:

B2Br has no oxygen atoms

6 HNO3 has 18 oxygen atoms (6 x 3)

Product side:

2 B(NO3)3 has 18 oxygen atoms (2 x 3 x 3)

6 HBr has no oxygen atoms

18 oxygen atoms total are present on the reactant side.

18 oxygen atoms total are on the product side.

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The number of moles of hydrogen that can be made from 4.89 x 10-22 atoms of iron is 6.65 x 10-26 moles H2.

Hydrogen is the most abundant element found in the universe. It is a colorless, odorless gas that is the lightest of all elements. Hydrogen has the symbol H and the atomic number 1. It is the most basic building block of all matter. Hydrogen is an important part of many molecules, including water (H2O), proteins, and fats. It is a key component of many fuels, including gasoline, natural gas, and propane. Hydrogen is used in the production of ammonia, methanol, and other chemicals. It is also used in fuel cells.

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the chemist can report that the molar heat capacity of  [tex]C_{3} H_{9}N[/tex]  is 134.0 J/mol·K (rounded to three significant digits).

To calculate the molar heat capacity of  [tex]C_{3} H_{9}N[/tex] , we need to know the number of moles of  [tex]C_{3} H_{9}N[/tex]  in the sample and the amount of heat absorbed by the sample. We can use the following formula to calculate the number of moles of  [tex]C_{3} H_{9}N[/tex]

n = m/M

where:

n = number of moles

m = mass of [tex]C_{3} H_{9}N[/tex] (809.0 mg)

M = molar mass of  [tex]C_{3} H_{9}N[/tex]

The molar mass of [tex]C_{3} H_{9}N[/tex]  can be calculated as follows:

M = (3 x M(C)) + (9 x M(H)) + M(N)

Using the atomic masses of the elements from the periodic table, we can calculate the molar mass of  [tex]C_{3} H_{9}N[/tex]  as follows:

M(C) = 12.01 g/mol

M(H) = 1.008 g/mol

M(N) = 14.01 g/mol

M = (3 x 12.01) + (9 x 1.008) + 14.01 = 59.11 g/mol

Now we can calculate the number of moles of  [tex]C_{3} H_{9}N[/tex]

n = 809.0 mg / 59.11 g/mol = 0.01368 mol

Next, we can use the following formula to calculate the molar heat capacity of  [tex]C_{3} H_{9}N[/tex]

Cp = q/nΔT

We are given that q = 1834 J and we need to assume a value for ΔT. Let's assume that the temperature of the sample increased by 10.0°C (which is equivalent to 10.0 K). Then we can calculate the molar heat capacity of  [tex]C_{3} H_{9}N[/tex] as follows:

Cp = 1834 J / (0.01368 mol x 10.0 K) = 134.0 J/mol·K

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Answer:

Neither of these changes are caused by cooling, but both are chemical changes.

Explanation:

1 solution

2 liquid dispersed in gas

3.0 grams of NaHCO₃  will receive about 1.76 kJ of heat during the decomposition process.

To calculate the amount of heat absorbed when 3.0 grams of NaHCO₃ decompose, we need to first determine the limiting reactant and then use the balanced chemical equation and the enthalpy change to calculate the amount of heat absorbed.

The balanced chemical equation for the decomposition of NaHCO₃ is:

2 NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)

The enthalpy change for this reaction is not given, but assuming it is an endothermic reaction, the heat absorbed can be represented as a positive value.

First, we need to determine the limiting reactant. The molar mass of NaHCO₃ is:

NaHCO₃: 23.0 + 1.0 + 12.0 + 48.0 = 84.0 g/mol

Using the molar mass, we can convert 3.0 g of NaHCO₃ to moles:

3.0 g NaHCO₃ x (1 mol NaHCO₃/84.0 g NaHCO₃) = 0.0357 mol NaHCO₃

From the balanced equation, we know that 2 moles of NaHCO₃ produces 1 mole of CO₂. So, the moles of CO₂ produced from 0.0357 mol of NaHCO₃ is:

0.0357 mol NaHCO₃ x (1 mol CO₂/2 mol NaHCO₃) = 0.0179 mol CO₂

Next, we can use the enthalpy change for the reaction and the moles of CO₂ produced to calculate the heat absorbed:

0.0179 mol CO₂ x (98 kJ/1 mol) = 1.76 kJ

Therefore, the amount of heat absorbed when 3.0 grams of NaHCO₃ decompose is approximately 1.76 kJ.

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please make me brainalist and keep smiling dude

Answer:

fusion

Explanation: hope this helps

Answer:

78 grams of sodium sulfide should be formed

Explanation:

The balanced chemical equation for the reaction between sodium and sulfur is:

2 Na + S → Na2S

According to the equation, 2 moles of sodium react with 1 mole of sulfur to produce 1 mole of sodium sulfide. The molar mass of sodium is approximately 23 g/mol and the molar mass of sulfur is approximately 32 g/mol.

We need to determine which reactant is limiting and which is in excess in order to calculate the amount of sodium sulfide produced.

Using the given masses, we can calculate the number of moles of each reactant:

moles of sodium = 23 g / 23 g/mol = 1 mol

moles of sulfur = 32 g / 32 g/mol = 1 mol

From this calculation, we can see that both reactants are present in the stoichiometric ratio required by the balanced equation, so neither is limiting.

Therefore, the amount of sodium sulfide formed will be based on the amount of either reactant, which is 1 mole. Using the molar mass of sodium sulfide (78 g/mol), we can calculate the mass of sodium sulfide formed:

mass of Na2S = 1 mol x 78 g/mol = 78 g

Therefore, when 23 grams of sodium react with 32 grams of sulfur, a total of 78 grams of sodium sulfide should be formed.

The number of years it will take for the population of orcas to double, given the births and deaths is 5. 10 years .

To find the population doubling time, we first need to find the rate at which the population of orcas grew in the current year:

= ( 15 births - 8 deaths ) / 51 orcas

= 7 / 51 x 100 %
= 13. 7 %

Then, we can use the Rule of 70 to find the doubling time. The Rule of 70 shows the periods till doubling as :

= 70 / growth rate

= 70 / 13.7

= 5. 10 years

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The number of mole of the sample containing 8.45×10²³ molecules CH₄ is 1.4 mole

Avogadro's hypothesis gives a well defined relationship between number of mole and number of molecules. This is given below:

6.022×10²³ molecules = 1 mole of substance

Thus, we can say that 1 mole of methane, CH₄ will be equivalent to 6.022×10²³ molecules as shown below:

6.022×10²³ molecules = 1 mole of CH₄

With the above information, we can determine the number of mole containing  8.45×10²³ molecules. Details below:

6.022×10²³ molecules = 1 mole of CH₄

8.45×10²³ molecules = 8.45×10²³ / 6.022×10²³

8.45×10²³ molecules = 1.4 mole of CH₄

Thus, the number of mole  is 1.4 mole

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Complete question:

What is the number of mole of a sample containing 8.45×10²³ molecules CH₄

The procedure for the amino acid chromatography states that you are to be careful not to touch the paper with your fingers, except along the edges, to prevent contamination of the paper or the sample. Chromatography is a technique used in the separation of different molecules or components of a mixture. It involves the movement of the components of a mixture through a stationary phase, which is usually a solid or liquid, in a mobile phase or a gas or liquid.

Chromatography is used in the separation and identification of amino acids, which are the building blocks of proteins. In amino acid chromatography, the stationary phase is a special paper or a silica gel-coated plate, and the mobile phase is a solvent, usually a mixture of water and an organic solvent.

When performing amino acid chromatography, it is crucial to avoid contamination of the paper or the sample with any foreign substances, such as dust, oil, or bacteria, which can interfere with the separation and identification of the amino acids. Therefore, it is essential to handle the paper with care and avoid touching it with bare hands.

The oils and sweat present on the hands can leave behind residues on the paper that can interfere with the separation process. Therefore, one should avoid touching the paper except along the edges, where there is less chance of contaminating the sample. To handle the paper, it is best to use forceps or gloves that do not leave behind any residues.

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Answer:

321.27 grams.

Explanation:

To determine the weight of 4.56 x 10^24 formula units of lithium chloride, we first need to know the molar mass of lithium chloride.

Lithium chloride (LiCl) has a molar mass of approximately 42.39 g/mol. This means that one mole of lithium chloride weighs 42.39 grams.

To convert formula units to moles, we need to use Avogadro's number, which is approximately 6.022 x 10^23 particles per mole.

So, to find the number of moles in 4.56 x 10^24 formula units of lithium chloride, we can divide by Avogadro's number:

4.56 x 10^24 formula units / (6.022 x 10^23 formula units/mol) = 7.58 moles

Now that we know the number of moles, we can use the molar mass to find the weight:

7.58 moles x 42.39 g/mol = 321.27 grams

Therefore, 4.56 x 10^24 formula units of lithium chloride weigh approximately 321.27 grams.

Stannous chloride (SnCl2) in a solution of hydrochloric acid (HCl) is the preferred reagent, also known as the HCl-SnCl2 reduction process, to convert m-bromoaniline diazonium to m-bromoaniline.

Reagents are substances that help a chemical process identify, measure, or make other chemicals. It can be applied to check for the presence or absence of certain compounds, analyse the chemical composition of a substance, or generate the desired outcome. Reagents can be organic or inorganic and can be solid, liquid, or gaseous. They can be either relatively inert or extremely reactive, depending on the intended function. Examples of common reagents include acids, bases, oxidising, reducing, catalytic, and indicator reagents. The specific reaction and the desired outcome, as well as factors like accessibility, cost, and safety, all have an impact on the reagent selection.

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The Quantashia, the largest collection of Tang poetry, has over 48,900 lyrics by more than 2,200 poets. Because poetry was such a huge part of the Tang Dynasty's culture at the time, a significant amount of it has remained. It had great impact on Chianese society.

Poetry remained a significant component of social life at all societal levels during the Tang period. For the civil service tests, scholars had to be proficient in poetry, but everyone had access to it in theory. This resulted to a significant record of poetry and poets, a fragmentary record of which persists today. Li Bai and Du Fu were two of the most well-known poets of the day. Chinese educated people today are familiar with Tang poetry because to the Three Hundred Tang Poems.

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Answer:

Lithium has a lower density than lead.

The density of an element is determined by its atomic mass and the packing arrangement of its atoms. Lithium has an atomic mass of 6.94 atomic mass units (amu), while lead has an atomic mass of 207.2 amu, which is significantly higher.

In addition to atomic mass, the density of an element is also affected by the arrangement of its atoms. Lithium has a much larger atomic radius than lead, meaning that its atoms are less tightly packed together. This results in a lower overall density for lithium compared to lead.

To provide some context, the density of lithium is approximately 0.53 grams per cubic centimeter (g/cm3), while the density of lead is approximately 11.34 g/cm3. This means that lead is about 21 times denser than lithium.

Answer:

Temperature and transverse motion are not related.

Explanation: