Plss help me solve question 7
Thank you.

Answer:

Explanation:

Both extraction and wash are technical materials separation processes. Both seek to carry out a separation of liquid-liquid, through the relationship between solvent and solute present in this solution. Both use a separation funnel and are very similar processes where the main difference is the purpose that each one seeks to exercise. The extraction causes the dissolution of the material that the researcher wants to leave behind. this process leaves impurities in the initial solution layer and moves the researcher's desired compound to the second layer of solution. A chemical reaction can take place during this process.

A wash, on the other hand, dissolves all impurities from the solution and extracts the compound desired by the researcher. Therefore, we can conclude that during this process the impurities are moved from one layer to another in the solution until it is discarded from the funnel, leaving the desired compound in the initial layer.

Answer:

The volume of the bulb is 229.0mL

Explanation:

To solve this question we need to use Boyle's law that states that the pressure is inversely proportional to the volume of a gas under constant temperature. in the problem:

P1V1 = P2V2 + P3V1

Where P is pressure and V volume of:

1, initial state of the gas. 2, state of the transferred flask, 3, final state of the gas in the initial bulb

Replacing:

756mmHg*V1 = 750.0mmHg*40mL + 625mmHg*V1

131mmHg*V1 = 30000mmHg*mL

V1 = 229.0mL

The volume of the bulb is 229.0mL

Answer:

Decrease temperature or reduce pressure

Answer:

it will be no. A that is thereis hydrogen bonding H2 molecules and between H2O molecules

Answer:

Electronegativity (EN): A measure of an atom's ability to attract electrons (or electron density) toward itself.

Atomic Radius(R) is defined as one-half the distance between the nuclei of identical atoms that are bonded together.

Ionization Energy is the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.

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Answer:

The options are

A) n = 1 → n = 6

B) n = 6 → n = 1

C) n = 6 → n = 3

D) n = 3 → n = 6

E) n = 1 → n = 4

The answer is A) n = 1 → n = 6

The transition results in the absorption of the highest-energy photon. This is because absorption typically involves the movement from a lower energy state to a higher level.

The answer here is B as a result of it being the option which moves from a lower state to a higher state with a bigger margin than the rest.

Answer:

The correct answer is - A. ammonia blue.

Explanation:

It is given that there is a mixture of ammonium chloride and sodium hydroxide and if we heat the  Mixture of NH4Cl and NaOH then, the following reaction will take place-

NH4Cl (aq)+ NaOH (aq)==> NaCl (aq) + NH3 (g)+ H2O (l)

In this reaction, there is a release of NH3 gas which is absorbed on litmus paper. We know that NH3 gas is basic in nature and so it will turn litmus paper blue.

Thus, the correct answer would be - NH3 (ammonia ) and Blue

Answer:

They contain different five-carbon sugars and a different nitrogenous base.

Answer:

Examples. Glucose (C6H12O6), ribose (C5H10O5), Acetic acid (C2H4O2), and formaldehyde (CH2O) all have different molecular formulas but the same empirical formula: CH2O.

Explanation:In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound.

Explanation:

6 F2------->4 AlF3

F2-----------> 4/6 AlF3

8.25 F2 ---------> 4×8.25/6 AlF3

so 5.5 moles

Answer:

Phenols do not exhibit the same pka values as other alcohols;

They are generally more acidic.

Using the knowledge that hydrogen acidity is directly related to the stability of the anion formed, explain why phenol is more acidic than cyclohexane.

Explanation:

According to Bromsted=Lowry acid-base theory,

an acid is a substance that can release [tex]H^{+}[/tex] ions when dissolved in water.

So, acid is a proton donor.

If the conjugate base of an acid is more stable then, that acid is a strong acid.

In the case of phenol,

the phenoxide ion formed is stabilized by resonance.

[tex]C_6H_5OH -> C_6H_5O^- +H^+[/tex]

The resonance in phenoxide ion is shown below:

Whereas in the case of cyclohexanol resonance is not possible.

So, cyclohexanol is a weak acid compared to phenol.

Answer:

4.7 g

Explanation:

The reaction that takes place is:

First we convert 4.8 g of CaCl₂ into moles, using its molar mass:

Then we convert CaCl₂ moles into Na₃PO₄ moles, using the stochiometric coefficients of the balanced reaction:

Finally we convert 0.0288 moles of Na₃PO₄ into grams, using its molar mass:

Answer:

6.33×10¯²² g

Explanation:

From the question given above, the following data were obtained:

Number of atoms = 6 atoms

Mass of copper (Cu) =?

From Avogadro's hypothesis, we understood that:

6.02×10²³ atoms = 1 mole of Cu

But 1 mole of Cu = 63.5 g

Thus,

6.02×10²³ atoms = 63.5 g of Cu

Finally, we shall determine the mass of 6 atoms of copper. This can be obtained as illustrated below:

6.02×10²³ atoms = 63.5 g of Cu

Therefore,

6 atoms = (6 × 63.5) / 6.02×10²³

6 atoms = 6.33×10¯²² g of Cu

Therefore, the mass of 6 atoms of copper is 6.33×10¯²² g.

Solution :

A cell that is concentrated is constructed by the same half reaction for the anode as well as he cathode.

We know,

In a standard cell,

the reduction half cell reaction is :

[tex]$Ag^+(aq)+e^- \rightarrow Ag(s) E^0 = -0.80 \ V$[/tex]

The oxidation half ell reaction :

[tex]$Ag(s) \rightarrow Ag^+(aq) + e^- \ E^0= +0.80 \ V$[/tex]

Thus the complete reaction of the cell is :

[tex]$Ag^+(aq)+ Ag(s) \rightarrow Ag^+(aq)+Ag(s)$[/tex]

[tex]$E^0 $[/tex] cell = [tex]$E_R - E_L = 0.00 \ \text{volts}$[/tex]

Answer:

A. 2 shifts

B. 15 loads of laundry

C. 3.75 loads of laundry

Note: The question is missing some details. A similar complete question is given below:

You wash dishes for a chemistry laboratory to make extra money for laundry. You earn 12 dollars/hour, and each shifts lasts 75 minutes. Your laundry requires 12 quarters/load. How many loads of laundry can you wash if you work 3 shifts? How many loads of laundry will each shift pay for if the cost per load rises to 16 quarters?

Explanation:

The following information is provided :

Amount earned per hour = 12 dollars/hour

Duration for one shift = 75 minutes = 1.25 hours

Cost per load = 12 quarters/load

A. Cost of 10 loads of laundry = 12 × 10 = 120 quarters

120 quarters = 120/4 dollars = 30 dollars

Time taken to earn 30 dollars = 30/12 × 1 hour = 2.5 hours

Number of shifts required in 2.5 hours = 2.5/1.25 = 2 shifts

Therefore, 2 shifts are required to wash 10 loads of laundry

B. Duration of 3 shifts = 1.25 hours × 3 shifts = 3.75 hours

Amount earned in 3 shifts = 3.75 × 12 = 45 dollars

12 quarters/load = 12 × 0.25 dollars = 3 dollars/load

Number of loads that can be washed = 45/3 = 15 loads of laundry

Therefore, 15 loads of laundry can be washed in 3 shifts

C. 16 quarters/load = 16 × 0.25 = 4 dollars/ load

Amount earned per shift = 1.25 × 12 =15 dollars

Loads of laundry per shift = 15/4 = 3.75 loads

Therefore, 3.75 loads will be paid per shift

Answer:

The density of water is about 1.0 g/mL at room temperature.

Briefly explain how the density of an aqueous solution at room temperature can be significantly less than 1.0 g/mL.

Give an example of such a solution.

Explanation:

That means 1.0mL of water weighs ---- 1.0g

If any other aqueous solution which has mass less than 1.0g will have density less than 1.0g.

For example aqueous solution of sulfuric acid has density 0.98g/mL.

That means 1mL of sulfuric acid has mass 0.98g.

Dissolving gases or liquids in water whose density are less than that of water will result in an aqueous solution whose density is less than that of water, for example, sulfuric acid which has a density 0.98g/mL.

The density of a substance is the ratio of the mass to the volume of that substance.

Density measures compactness.

More compact substances are more dense.

The density of water is about 1.0 g/mL at room temperature.

This means that 1.0mL of water weighs 1.0g

1.0 mL of an aqueous solution whose mass is less than 1.0g will have density less than that of water.

Dissolving gases or liquids in water whose density are less than that of water will result in an aqueous solution whose density is less than that of water.

An example of an aqueous solution whose density is less than that of water is sulfuric acid which has a density 0.98g/mL.

Sulfuric acid is prepared by dissolving sulphur (vi) oxide, a gas, in water.

This means 1mL of sulfuric acid has mass 0.98g.

Learn more about density at: https://brainly.com/question/406690

Answer:

161 mL

Explanation:

First we calculate how many Pb⁺² moles reacted, using the given concentration and volume of the Pb(NO₃)₂ solution:

As 1 millimol of Pb(NO₃)₂ would react with 1 millimol of Ba(OH)₂, to precipitate 107 mmoles of Pb(NO₃)₂ we would require 107 mmoles of Ba(OH)₂.

Using the number of moles and the concentration we can calculate the required number of milliliters:

Answer:

Ph level 0-7 is a acid

ph level 7-14 is base

bases turn paper blue

acids dissolve metal

acids contain hydrogen ions

Explanation:

I dont know the last one all I know that they become neutral when acids and bases are mixed.

Answer:

68.97g of milk must be added

Explanation:

To solve this problem we need to use the equation:

Q = C*m*ΔT -Coffee cup calorimeter equation-

This equation relates mass and change in temperature with heat of solution, Q.

The energy that decreases in the milk is the same that increases in the milk. That is:

Q(milk) = Q(tea)

Using the equation:

4.184J/molK* Mass milk * (65.0°C - 7.00°C) = 4.184J /molK * 200g (Tea) * (85.0°C - 65.0°C)

Mass milk * 58.0°C = 200g * 20.0°C

Mass milk = 4000g°C / 58.0°C

Mass milk =

68.97g of milk must be added

Answer:

NBr3 - Trigonal pyramidal

SO2- Bent

SBr42+- Tetrahedral

SO42- Tetrahedral

CF3Cl - Tetrahedral

Explanation:

The shape of a molecule depends on the number of electron pairs on the valence shell of the central atom in the molecule. This is well captured in the valence shell electron poair repulsion theory.

The number of electron pairs on the outermost shell of the central atom in a molecule are called regions of electron density. According to this theory, these regions of electron density must be positioned as far apart from each other as possible to minimize repulsions between electron pairs.

This theory is the basis of the shapes of molecules shown in the answer. If a molecule has four regions of electron density, it could be trigonal pyramidal or tetrahedral in shape such as NBr3 and CF3Cl.

Note that, when deciding on the three dimensional geometry of a molecule, only the covalent bonds present are considered.

Answer:

on the back of the firing pin

Explanation:

Answer:

In HCl ,bond between hydrogen and chlorine is covalent. But due to difference in electronegativity of hydrogen and chlorine,shared electron pair gets attracted towards chlorine. Due to this polar covalent

Answer:

4.3 is your answer because it's matches

Answer:

See explanation.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to realize that the NaCl solution must react with an aluminum-containing substance, say the hydroxide or any other salt, so that the following equation will take place:

[tex]3NaCl(aq)+Al^{3+}\rightarrow 3Na^+(aq)+AlCl_3(s)[/tex]

In such a way, given the volume of the NaCl solution, it must be necessary to know its concentration, in order to get moles of this salt, further use the 3:1 mole ratio of NaCl to AlCl3 and the molar mass of the latter (133.34 g/mol) in order to solve an stoichiometric setup like the following:

[tex]m_{AlCl_3}=V_{NaCl}*M_{NaCl}*\frac{1molAlCl_3}{3molNaCl} *\frac{133.34gAlCl_3}{1molAlCl_3}[/tex]

Besides, you must make sure the volume is in liters.

Best regards!

Answer:

Equilibrium will be shifted towards NO2 as it has the most of the moles in the reaction.

Explanation:

Hello there!

In this case, according to the equilibrium reaction between NO2 and N2O4, we are able to write:

[tex]2NO_2(g)\rightleftharpoons N_2O_4(g)[/tex]

We can recall the LeCha-telier's principle to realize that the increase of volume promotes the formation of the most of the moles, this is for NO2 because it has a coefficient of 2 and N2O4 a coefficient of 1; in such a way, we infer that the addition of argon, to increase the pressure, will shift the equilibrium towards NO2.

Regards!

Answer:

15 kgm/s of momentum

Explanation:

Answer:

Ca(ClO3)2

Explanation:

The chemical formula of calcium chlorate is Ca(ClO3)2, which means in this molecule, Ca2+ ion is bonded to two ClO3- ions. So the formula can be expended to O3Cl-Ca-ClO3, or CaCl2O6 (basically times the numbers of the elements inside the bracket by the number outside the bracket.