A[?] is a heterogeneous mixture which settles on standing and its components can be separated by filtration. colloid suspension​

Answer:

0.46 grams (C₆H₅)₂CO

Explanation:

To find the mass of benzophenone ((C₆H₅)₂CO), you need to (1) convert mmoles to moles and then (2) convert moles to grams (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units. The final answer should have 2 sig figs to match the sig figs of the given value (2.5 mmoles).

Molar Mass ((C₆H₅)₂CO): 13(12.011 g/mol) + 10(1.008 g/mol) + 15.998 g/mol

Molar Mass ((C₆H₅)₂CO): 182.221 g/mol

2.5 mmoles (C₆H₅)₂CO               1 mole                  182.221 g
-----------------------------------  x  ------------------------  x  -------------------  =
                                                1,000 mmoles            1 mole

=  0.46 grams (C₆H₅)₂CO

Considering the combined law equation, the new temperature is -244.56 °C or 28.44 K.

Boyle's law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container, when the temperature is constant: if the pressure increases, the volume decreases while if the pressure decreases, the volume increases.

Mathematically, this law states that the multiplication of pressure by volume is constant:

P×V=k

Charles's law states that the volume is directly proportional to the temperature of the gas: if the temperature increases, the volume of the gas increases while if the temperature of the gas decreases, the volume decreases.

Mathematically, Charles' law states that the ratio of volume to temperature is constant:

[tex]\frac{V}{T} =k[/tex]

Gay-Lussac's law states that the pressure of a gas is directly proportional to its temperature: increasing the temperature will increase the pressure, while decreasing the temperature will decrease the pressure.

Mathematically, Gay-Lussac's law states that the ratio of pressure to temperature is constant:

[tex]\frac{P}{T} =k[/tex]

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{PxV}{T} =k[/tex]

Considering an initial state 1 and a final state 2, it is fulfilled:

[tex]\frac{P1xV1}{T1} =\frac{P2xV2}{T2}[/tex]

In this case, you know:

Replacing in the combined law equation:

[tex]\frac{760 mmHgx15 L}{243 K} =\frac{58 mmHgx23 L}{T2}[/tex]

Solving:

[tex]T2x\frac{760 mmHgx15 L}{243 K} =58 mmHgx23 L[/tex]

[tex]T2 =\frac{58 mmHgx23 L}{\frac{760 mmHgx15 L}{243 K}}[/tex]

T2= 28.44 K= -244.56 °C

Finally, the new temperature is -244.56 °C or 28.44 K.

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When traveling through a smoke-filled area, a person must be able to have distance of at least 4 feet in order to safely reach a fire exit. That is option C.

Smoke-filled area is an enclosed area that is filled with smoke gas that is usually made up of carbon monoxide.

The smoke-filled area is usually caused by

When there is smoke-filled area die to fire out break, there are some guidelines to follow to safely reach the fire exit early enough.

The importance of these guidelines include the following:

The affected individual should get down and crawl while taking short breath through the nose because cleaner air is nearest to the floor.

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Answer:

C.) 109.9 g/mol

Explanation:

The molar mass is the sum of each element's atomic weight times their quantity. There is one atom of each element unless denoted by subscripts.

Atomic Mass (Li): 6.9410 g/mol

Atomic Mass (S): 32.065 g/mol

Atomic Mass (O): 15.998 g/mol

Molar Mass (Li₂SO₄): 2(6.9410 g/mol) + 32.065 g/mol + 4(15.998 g/mol)

Molar Mass (Li₂SO₄): 109.939 g/mol

The sublevels that contains only orbitals that are shaped like bells are the 3p. That is option C.

Atomic orbitals are defined as the mathematical terms that are used to describe the positions of electrons on the atoms.

Examples of sublevels of atomic orbitals are s, p, d, and f. The 3p are the only orbitals that are bell like in shape

Therefore, sublevels that contains only orbitals that are shaped like bells are the 3p.

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The isotope that is more abundant, given the data is isotope Li7

Atomic mass = [(mass of A × A%) / 100] + [(mass of B × B%) / 100]

6.94 = [(6.02 × A%) / 100] + [(7.02 × (100 - A)) / 100]

6.94 = [6.02A% / 100] + [702 - 7.02A% / 100]

6.94 = [6.02A% + 702 - 7.02A%] / 100

Cross multiply

6.02A% + 702 - 7.02A% = 6.94 × 100

6.02A% + 702 - 7.02A% = 694

Collect like terms

6.02A% - 7.02A% = 694 - 702

-A% = -8

A% = 8%

Thus,

Abundance of B = (100 - A)%

Abundance of B = (100 - 8)%

Abundance of B = 92%

SUMMARY

From the above, isotope Li7 is more abundant.

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The thing that will happen to mangroves if nearby a coral reefs are destroyed is that:

The destruction that is known to have taken place in mangrove forests in the area of the coastal wetlands is known to be one that is highly  depleting the amount of natural tannins in the water.

Due to the above, this is known to have subjected the close by coral reefs to have what we call an undue UV radiation. Its effect is that the reefs are said to be sunburned a lot and then the coral bleaching takes place.

Therefore, The thing that will happen to mangroves if nearby a coral reefs are destroyed is that Option C: Reefs will receive less sunlight due to increased turbidity in the water.

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2756.1 liters of fluorine gas is needed to produce 919 liters of sulfur hexafluoride.

The volume of SF₆ = 919 L

Pressure = 2 atm

Temperature = 273.15 k

The volume of fluorine required =?

Balance chemical equation:

   S (s) + F₂(g)    →  SF₆(g)

First of all, we will calculate the moles of SF₆.

 PV = nRT

 n = PV/RT

 n = 2. atm× 919L / 0.0821 L. atm. mol⁻¹. K⁻¹  × 273.15 K

 n = 1838 atm. L/ 22.43 L. atm. mol⁻¹

 n = 81.9 mol

81.9 moles of SF₆ will produce.

Now we will compare the moles of SF₆ and fluorine from the balanced chemical equation.

  SF₆:   F

  1     :    3

 81.9  :   3/1 × 81.9  = 245.7 moles

Now we will calculate the volume of fluorine.

PV = nRT

V  = nRT / P

V= 245.7 mol × 0.0821 L. atm. mol⁻¹. K⁻¹  × 273.15 K / 2 atm

 V = 5512.2 / 2

 V = 2756.1 L

2756.1 liters of fluorine gas are needed to produce 919 liters of sulfur hexafluoride.

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Answer:

12 moles Cl⁻

Explanation:

To find the moles Cl⁻, you need to (1) calculate the moles of magnesium chloride (MgCl₂) using the molarity equation and then (2) convert moles MgCl₂ to moles Cl⁻ (via the mole-to-mole ratio from formula subscripts). It is important to arrange the conversions in a way that allows for the cancellation of units.

Molarity (M) = moles / volume (L)

2 M = moles / 3 L

6 = moles MgCl₂

1 MgCl₂ = 1 Mg²⁺ and 2 Cl⁻

6 moles MgCl₂            2 moles Cl⁻
------------------------  x  -----------------------  =  12 moles Cl⁻
                                   1 mole MgCl₂

Answer: 5.72%

Explanation:

Given:

Experimental value of gas constant, R = 0.0878 L.atm/mol⋅K

Known value of gas constant, R = 0.0821 L.atm/mol⋅K

This percent error is defined as the difference in percentage between a measurement's real value and its observed value.

[tex]\text { Percent Error }=\frac{\mid \text { Experimental Value }-\text { Known Value } \mid}{\text { Known Value }} * 100[/tex]

[tex]\text { Percent Error }=\frac{\mid \text {0.0878}-\text { 0.0821 } \mid}{\text { 0.0821 }} * 100[/tex]

[tex]\bf{Percent \ Error = 5.72\%}[/tex]

Answer:

[tex]\huge\boxed{\sf Ribosomes}[/tex]

Explanation:

[tex]\rule[225]{225}{2}[/tex]

Answer:

nah what questionExplanation:

Answer:

When an alkane undergoes a halogenation reaction, the majority of the products will add the halogen to the most substituted and most stable carbon. In this case, this would likely be the third carbon (middle).

Key:

Leftmost molecule = C₅H₁₂

Rightmost molecule = C₅H₁₁Cl

*Not pictured = HCl (another product)

Answer:

-43.3 °C

Explanation:

To find the temperature, you need to use the Ideal Gas Law equation. The equation looks like this:

PV = nRT

In this formula,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Law constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

By plugging the given values into the equation and simplifying, you can find the temperature. After you get a temperature, you need to convert it into Celsius.

P = 2.88 atm                              R = 0.08206 atm*L/mol*K

V = 3.76 L                                   T = ? K

n = 0.574 moles

PV = nRT

(2.88 atm)(3.76 L) = (0.574 moles)(0.08206 atm*L/mol*K)T

10.8288 = (0.04710244)T

230. K = T

Kelvin - 273.15 = Celsius

230 K - 273.15 = -43.3 °C

Answer:

A.) Change only the coefficients

Explanation:

An equation is balanced when there is an equal quantity of each type of element on both sides of a reaction. When balancing an equation, the only way to manipulate the amounts of each element is by changing the coefficient values. The coefficients alter the amount of each molecule in the reaction.

The subscripts cannot be altered. If you were to change the subscripts, you would be altering the amount of atoms in a particular molecule.

Answer:

The removal of second electron from alkaline earth metals leads to the stable octet state in M2+ ions. In case of alkali metals it is not so. Since the removal of electron leads to stability, hence it can easily removed leading to lowering of second ionization enthalpy in alkaline earth metals.

Explanation:

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Considering the definition of mole fraction, the mole fraction of O₂ in the mixture is 0.434.

The molar fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution.

In other words, the mole fraction expresses the concentration of solute in a solution as the ratio of moles of substance to total moles of solution:

[tex]mole fraction=\frac{moles of substance}{moles of solution}[/tex]

In this case, you know a gas mixture used for anesthesia contains 4.60 mol oxygen (O₂) and 6.00 mol nitrous oxide (N₂O).

So, the total moles of the solution can be calculated as:

Total moles = moles of oxygen (O₂) + moles of nitrous oxide (N₂O)

Then:

Total moles= 4.60 moles + 6 moles

Total moles= 10.60 moles

Finally, the more fraction of O₂ can be calculated as follow:

[tex]Mole fraction of O_{2} =\frac{moles of O_{2}}{total moles}[/tex]

[tex]Mole fraction of O_{2} =\frac{4.60 moles}{10.6o moles}[/tex]

Solving:

Mole fraction O₂ = 0.434

Finally, the mole fraction of O₂ in the mixture is 0.434.

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Answer:

3

Explanation:

An equation is balanced when there is an equal amount of each element on both sides of the reaction. You can change these amounts by adding coefficients.

The unbalanced equation:

FeCl₃ + NH₄OH ---> Fe(OH)₃ + NH₄Cl

Reactants: 1 iron, 3 chlorine, 1 nitrogen, 5 hydrogen, 1 oxygen

Products: 1 iron, 1 chlorine, 1 nitrogen, 7 hydrogen, 3 oxygen

The balanced equation:

FeCl₃ + 3 NH₄OH ---> Fe(OH)₃ + 3 NH₄Cl

Reactants: 1 iron, 3 chlorine, 3 nitrogen, 15 hydrogen, 3 oxygen

Products: 1 iron, 3 chlorine, 3 nitrogen, 15 hydrogen, 3 oxygen

Ammonium Chloride = NH₄Cl

Answer:

NH₄ClO₃ and NaCl

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one compound is swapped with the cation of another.

So, NH₄⁺ from NH₄Cl is swapped with Na⁺ from NaClO₃. It is important that the resulting ionic compound has an overall charge of 0. In this case, the charges perfectly balance, so there only needs to be one atom of each ion in the compounds.

1.) NH₄ClO₃

-----> NH₄⁺ and ClO₃⁻

-----> +1 + (-1) = 0

2.) NaCl

-----> Na⁺ and Cl⁻

-----> +1 + (-1) = 0

The chemical equation:

NH₄Cl + NaClO₃ -----> NH₄ClO₃ + NaCl

Your answer would be C, 4.8%.

Answer:

A

Explanation:

In a simple perspective, an ion of an element is an element +- [tex]n[/tex] amount of electrons.

We know that electrons have atomic mass, so we can mark off D

We know that with more or fewer electrons, the electron configuration would change

However, the number of protons won't change in the ion of an element, this is because an ion is only the change in electrons, not protons or neutrons (the particles that make up a nucleus of an atom)

The correct option is D. 0.2 M CaCl2​ is has the lowest freezing point.

When one significance liquefies into another, a solution is formed. A solution is a homogenous mixture consisting of a solute dissolved into a solvent. The solute is the essence that is being dissolved, while the solvent is the dissolving medium. Solutions can be formed with multiple different classifications and forms of solutes and solvents. In this branch, we will focus on a resolution where the solvent is water.

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If U-235 decays into Cs-135 and 4 neutrons, the other nuclide that will be produced is Rb-96 (option D).

A radioactive decay is the process by which an unstable large nuclei emit subatomic particles and disintegrate into one or more smaller nuclei.

According to this question, a radioactive material Uranium- 235 undergoes radioactive decay into Cs- 135 and 4 neutrons (1/0n).

This means that the mass of the products we have is 135 + 4 = 139.

The mass of the nuclide left must be 235 - 139 = 96, hence, the other nuclide that will be produced is Rb-96.

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0.18 M nitrous acid + 0.13 M sodium nitrite is a good buffer system.

Hence, Option A is correct answer.

It is a solution that prevent any changes in the pH of the solution on the addition of an acidic and basic components.

Now lets check all options one by one:

Option (A): 0.18 M nitrous acid + 0.13 M sodium nitrite

Nitrous acid is a weak acid and sodium nitrate is a conjugate base. This is a buffer.

Option (B): 0.27 M nitric acid + 0.25 M sodium nitrate

Nitric acid is a strong acid and sodium nitrate is neutral salt. So this is not good buffer.

Option (C):  0.29 M ammonia + 0.40 M potassium hydroxide

Potassium hydroxide is a strong base and Ammonia is also a strong base. So this is not a good buffer.

Option (D): 0.15 M sodium hydroxide + 0.30 M sodium chloride

Sodium hydroxide is a strong base and Sodium chloride is a ionic salt. So this is not a good buffer.

Option (E): 0.32 M sodium chloride + 0.20 M calcium chloride

Sodium chloride is a ionic salt and calcium chloride is a salt of strong acid. So this is not a good buffer.

Thus from the above conclusion we can say that 0.18 M nitrous acid + 0.13 M sodium nitrite is a good buffer system.

Hence, Option A is correct answer.

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Answer:

Mole Fraction (H₂O)  =  0.6303

Mole Fraction (C₂H₅OH)  =  0.3697

Explanation:

(Step 1)

Calculate the mole value of each substance using their molar masses.

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

200.0 g H₂O            1 mole
---------------------  x  ------------------  =  11.10 moles H₂O
                                 18.014 g

Molar Mass (C₂H₅OH): 2(12.011 g/mol) + 6(1.008 g/mol) + 15.998 g/mol

Molar Mass (C₂H₅OH): 46.068 g/mol

300.0 g C₂H₅OH              1 mole
----------------------------  x  --------------------  =  6.512 moles C₂H₅OH
                                         46.068 g

(Step 2)

Using the mole fraction ratio, calculate the mole fraction of each substance.

                                            moles solute
Mole Fraction  =  ------------------------------------------------
                               moles solute + moles solvent

                                                  11.10 moles H₂O
Mole Fraction  =  -------------------------------------------------------------
                               11.10 moles H₂O + 6.512 moles C₂H₅OH

Mole Fraction (H₂O)  =  0.6303

                                             6.512 moles C₂H₅OH
Mole Fraction  =  -------------------------------------------------------------
                               11.10 moles H₂O + 6.512 moles C₂H₅OH

Mole Fraction (C₂H₅OH)  =  0.3697

The rate constant of the second order reaction is 0.137 M-1s-1.

For the second order reaction we can write;

1/[A] = kt + 1/[A]o

[A]o = initial concentration

[A] = final concentration

k = rate constant

t = time

Now;

1/0.319 = 13.5k + 1/ 0.740

1/0.319 - 1/0.740 = 13.5k

3.13 - 1.35 = 13k

k = 3.13 - 1.35/13

k = 0.137 M-1s-1

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Answer: temperature and salinity.

Explanation:

The balanced redox equation of the reaction is given below:

The oxidizing agent is MnO₄ while the reducing agent is I⁻.

Redox equations are equations in which oxidation and reduction reactions occur together.

Redox reactions can take place in alkaline or acidic mediums.

The balanced redox equation of the reaction is given below:

The oxidizing agent is MnO₄ while the reducing agent is I⁻

In conclusion, a balanced redox equation is one in which the atoms and the change in oxidation state is equal on both sides of the reaction.

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Answer:

[tex]V_2 = \frac{5V}{8}[/tex]

Explanation:

I am assuming you are saying what is the final volume of the gas

Known :

Initial volume (V1) = V

Initial temperature (T1) = T

Final temperature (T2) = 5/4 T

Initial pressure (P1) = P

Final pressure (P2) = 2P

Wanted: Final volume (V2)

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\frac{PV}{T} = \frac{(2P)V_2}{(5/4)T}\\\frac{V}{1} = \frac{(2)V_2}{5/4}\\5/4V = 2V_2\\\\V_2 = \frac{5V}{8}[/tex]

Answer:

2H2(g) + O2 -> 2H2O

Explanation:

According to the law of conservation of mass, mass cannot be created nor destroyed in a chemical formula.

The only chemical reaction of the five options that follows this law is

2H2(g) + O2 -> 2H2O because the mass of the compounds stays the same before the reaction (arrow) and after.

Before reaction (reactants) we have:

2 (H2) = 4H

1 (O2) = 2O

After reaction takes place (products) we have:

2 (H2O) = 4H and 2O

and so mass is conserved.

Answer: its the 3rd option

Explanation: on edge hope this helps