A chemist wants to prepare a stock solution of H2SO4 so the samples of 20ml will produce a solution with concentration of 0.5M when added to 100ml of water. What should the molarity if the stock solution be?

Answer:

incisors, molars, canines.

Explanation:

All of these 3 teeth types appear in ourselves so in conclusion mammals. Plus there has never been gills in any mammal.

Answer:

C

Explanation:

a and b represent ice and melting respectively

Answer:

About 8.94.

Explanation:

Because we are given a 500. mL volumetric flask, the solution will have a volume of 500. mL.

Find the number of moles of zinc fluoride needed. Recall that molarity is simply moles per liter of solution:

[tex]\displaystyle 500.\text{ mL} \cdot \frac{0.173\text{ mol ZnF$_2$}}{1\text{ L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.0865\text{ mol ZnF$_2$}[/tex]

Convert this to grams. The molecular weight of zinc fluoride is 103.38 g/mol:
[tex]\displaystyle 0.0865\text{ mol ZnF$_2$} \cdot \frac{103.38\text{ g ZnF$_2$}}{1\text{ mol ZnF$_2$}} = 8.94\text{ g ZnF$_2$}[/tex]

In conclusion, about 8.94 grams of solid zinc fluoride should be added.

Answer:Artificial light from cities has created a permanent "skyglow" at night, obscuring our view of the stars. Here's their map of artificial sky brightness in North America, represented as a ratio of "natural" nighttime sky brightness. In the black areas, the natural night sky is still (mostly) visible.

Explanation:

Answer:

0.215 L HCl

Explanation:

Using the relationship (M1 x V1 = M2 x V2) between Molarity (M) and Volume (v or L), we can find the volume of the 2nd volume amount.

First we rearrange our relationship equation to: [tex]V_2 = \frac{M_1 * V_1 }{M_2}[/tex]

Now, plug in the values. [tex]V_2 = \frac{0.2 * 2.8}{2.6}[/tex]

Calculating these values, we end up with the answer:

0.215 L HCl

According to  the Charle's law as pressure is constant the new volume of gas is 4.907 L.

Charles law is an experimental gas law which provides description about the behavior of gases which tend to expand on heating.It states that, at constant pressure, the temperature is in direct proportion with the volume that is,V∝T or V₁/T₁=V₂/T₂.The relation between volume and temperature is linear as the temperature increases volume also increases.

The graph of volume versus temperature is a straight line passing through the origin.The law was proposed by Jacques Charles , a french physicist in 1780.

In the given problem , on substituting values in above formula, V₂=3.8×278/359=4.907 L.

Thus , the new volume of methane gas is 4.907 L.

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We can calculate the change in free energy for a reaction under nonstandard conditions by using the ΔG = ΔH - TΔS equation.

Change in gibbs free energy of any reaction will be calculated by uisng the below equation as:

ΔG = ΔH - TΔS, where

ΔH = change in enthalpy

T = temperature of reaction

ΔS = chnage in entropy

By putting all given values we can calculate the gibbs free energy of the reaction, and negative sign of energy shows the spontaneity of the reaction.

Hence by using the enthalpy, entropy and temperature we can calculate the free energy change.

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From the calculations in the question, we have that the dissociation constant is 2.5 * 10^-10.

The term Ka has to do with the acid dissociation constant and it is obtained from; Ka = [H+] [OBr–]/[HOBr]

Now, we are told that the hydrogen ion concentration at equilibrium is 9. 1 × 10–6 and the HOBr concentration is 0.33 M, it the follows that;

Ka = (9. 1 × 10–6)^2/ 0.33

Ka = 2.5 * 10^-10

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The limiting reactant refers to the reactant that is in small amount. The extent of the reaction depends on the amount of the limiting reactant.

The term limiting reactant refers to the reactant that is in small amount, We shall now solve the questions individually.

1) The reaction equation is;

CaO + H2O → Ca(OH)2

Number of moles of CaO = 10 g/56 g/mol = 0.18 moles

Number of moles of H2O = 10 g/18 g/mol = 0.56

Since the reaction is 1:1, CaO is the limiting reactant

Mass of calcium hydroxide = 0.18 moles * 74 g/mol = 13.32 g

2) The reaction equation is;

Mg + Br2 → MgBr2

Number of moles of Mg = 1 g/24 g/mol = 0.042 moles

Number of moles of Br2= 5 g/160 g/mol = 0.031 moles

Since the reaction is 1:1, Br2 is the limiting reactant

Mass of MgBr2 =  0.031 moles * 184 g/mol = 5.7 g

3) The reaction equation is;

CuO + H2 → Cu + H2O

Number of moles of CuO= 2.00 g/80 g/mol = 0.025 moles

Number of moles of H2 = 1.00g/2 g/mol = 0.5 moles

Since the reaction is 1:1, CuO is the limiting reactant

Mass of Cu = 0.025 moles * 63.5 g/mol = 1.59 g

4) The reaction equation is;

2Na + F2 → 2NaF

Number of moles of Na = 2.30 g/23 g/mol = 0.10 moles

Number of moles of F2 =  2.85 g/38 g/mol = 0.075 moles

If 2 moles of Na react with 1 mole of F2

x moles of  Na reacts with 0.075 moles of F2

x = 0.15

Hence Na is the limiting reactant

Mass of NaF = 0.10 moles * 42 g/mol = 4.2 g

5) The equation of the reaction is;

Fe2O3 + 2Al → 2Fe + Al2O3

Number of moles of Fe2O3  =  8.00 g/160 g/mol = 0.05 moles

Number of moles of Al = 2.16 g/27 g/mol = 0.08 moles

If 1 mole of Fe2O3  reacts with 2 mole of Al

x moles of Fe2O3 reacts with 0.08 moles of Al

x = 0.04 moles

Hence, Fe2O3 is the limiting reactant

1 mole of Fe2O3  yileds 2 moles of Fe

0.05 moles yileds 0.05 moles  * 2 moles/1 mole = 0.1 moles

Mass of Fe = 0.1 moles * 56 g/mol = 5.6 g

6) The equation of the reaction is;

2Al + 3Cl2 → 2AlCl3

Number of moles of Al = 13.5 g/27 g/mol = 0.5 moles

Num ber of moles of Cl2 =  42.6 g /71 g/mol = 0.6 moles

If 2 moles of Al reacts with 3 moles of Cl2

x moles of Al reacts with 0.6 moles of Cl2

x = 0.4 moles

Al is the limiting reactant

Mass of AlCl3 = 0.4 moles * 133 g/mol = 53.2 g

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People who are younger are usually at greater risk of alcohol related harm at a younger age. the younger you are when you drink alcohol, it can lead to you developing damage in your brain as well as problems later in life. drinking at a young age can lead to things like an inability to learn, problems with verbal skills, being dependent on alcohol, and depression.  

Answer: A-, NA+ And OH-

Explanation: Thank me later

Answer:

trigonal pyramidal

Explanation:

Looking at the PCl3 molecular geometry it is trigonal pyramidal with a bond angle of approx. 103o. The is mainly due to the disproportionate influence or greater repulsion of the phosphorus lone pair which makes it deviate from the ideal angle of 109o.

Answer:

I believe the molecular geometry of PCL3 would be trigonal planar.

Explanation:

(1) The number of moles of oxygen gas is 0.123 mole.

(2) The volume occupied by the nitrogen gas is 50.75 Liters.

(3) The pressure exerted by the CO2 gas is 28.7 atm

(4) The temperature of the Cl2 gas is -118.37⁰C

The number of moles of oxygen occupied at the given condition is calculated as follows;

PV = nRT

n = PV/RT

where;

n = (2.5 x 1.2) / (0.08205 x 298)

n = 0.123 mol

PV = nRT

V = nRT/P

where;

V = (2 x 62.36 x 293) / (720)

V = 50.75 Liters

PV = nRT

P = nRT/V

where;

Molar mass of CO2 = 44

n = 25/44 = 0.568

P = (0.568 x 0.08205 x 308)/(0.5)

P = 28.7 atm

T = PV/nR

molar mass of Cl2 = 71 g

n = 5/71 = 0.07

T = (900 x 0.75)/(0.07 x 62.36)

T = 154.63 K

T = 154.63 - 273 = -118.37⁰C

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Answer:

Empirical Formula N2O6Sr Strontium Nitrate

Explanation:

N=13.2% O=45.4% Sr=41.4%

Turner internal conflict is connected to the setting through him feeling stifled in the town but free in the open air of the beach which is option A.

This is when an individual is not in agreement with one another or having a contradictory feeling.

In this case, Turner feels stifled in the town but free in the open air of the beach which are contradictory and the reason for his internal conflict.

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Answer:

Turner feels stifled in the town but free in the open air of the beach.

Explanation:

Correct on Edge

Explanation:

Intermolecular forces: These are the attractive or repulsive forces acting between two molecule in interaction.

The attractive forces between molecules are of several types based on the interaction between molecules also known as Vander wall forces.

Bonding forces: They are also attractive forces acting between two constituents (atom, ion, radicals etc) and stabilizes the constituent particles by loss of energy. The bond between any two species are formed by the overlapping of corresponding orbitals.

Whenever positive overlapping occurs between species, the formation of Bonding molecular orbital (BMO) takes place. and when electron enters into BMO it loses energy. Alternative form of explaining the concept is Individual electron possess more energy than the electrons that paired or Bonded.

Now coming to your question,

All the intermolecular forces are formed by weak attractive forces (vanderwall forces) which includes Ion-dipole forces, Ion-induced-dipole forces, Dipole-dipole forces, Dipole-induced-dipole forces, Hydrogen bonds & London forces.

All these forces are temporary and weak, and formed by the poles generated on molecule due to shift of electron, for e.g. Any molecule having more electron at one pole and less electron at another pole then that molecule start acting as charged body when that charged body comes in contact with opposite pole of another charged body the interaction takes place, since the electrons are dynamic and unsteady it's not possible that the pole will keep acting same as before. hence the intermolecular forces are generally weaker.

On the other side the Bonding electrons, are formed by the various strong overlapping such as between Head to Head overlapping leads to formation of Sigma bond which is the strongest bond takes alot of Energy to break & Lateral overlapping lead to formation of pi bond which is also stronger bond than that of Hydrogen bond.

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Answer:

A D E hope it helps. have a great day

Addition reaction between water molecules and alkene molecules produces alcohol.

Addition reaction generally takes place across the unsaturated carbon compounds.

When water molecule (H₂O) is added to the alkene which may be ethene (C₂H₄) molecule then formation of product i.e. ethanol (CH₃CH₂OH) takes place through the addition of hydrogen and hydroxyl group across the double bond. And reaction is shown in the attached image.

Hence formation of alcohol product takes place.

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Answer:

0.7802 M

Explanation:

Data:

Wanted:

Equation:

M = [tex]\frac{mol}{L}[/tex]

Solution:

1. Convert mL to L:

2. Convert g to mol:

3. Molarity Equation:

Answer:

Explanation:

Mole weight of NaNO3 ====> ~~ 85 gm

6.631 / 85   = # moles in .1 liter

6.631/85  / (.1)  = .78 M

Answer:

Explanation:

The table below indicates the “Molecular Geometry” of the central atom depending on whether the groups of electrons around it are covalent bonds to other atoms or simply lone pairs of electrons.

Answer:

The stars arent moving, we are.

Explanation:

The rotational movement of the Earth is what makes the star appear as if moving from the east to the west in the sky, as the planet rotates with an axis pointed towards the direction of our/the North Star.

The entropy of the process in which the  individual ions first leave the crystal lattice is positive while the entropy of the process whereby the each ion becomes surrounded by a cluster of polar water molecules is negative.

The term entropy has to do with the degree of disorder in a system. The higher the entropy of the system, the more the disorderliness of the system.

Now, the entropy of the process in which the  individual ions first leave the crystal lattice is positive while the entropy of the process whereby the each ion becomes surrounded by a cluster of polar water molecules is negative.

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Answer:

C: remaining at rest

Explanation:

Acceleration (a) is the change in velocity (Δv), remaining at rest is not changing the velocity.

i think the volume will be 57 , I think it will help u

Answer:

Silver nitrate (AgNO3) reacts with copper (Cu) to form copper(II) nitrate (Cu(NO3)2) and silver (Ag). This can be called a redox reaction because silver nitrate is reduced and copper is oxidized

Answer:

You would need 85.5 g

Explanation:

Molarity=Moles of soluteVolume of solution (in litres)0.25 M=n1 Ln = 0.25 molSo, we need 0.25 mol of sucrose to make 0.25 M solution.Molar mass of sucrose (C12H22O11)=342 g/mol Mass of 0.25 mol sucrose is0.25mol×342gmol=85.5 g

Explanation:

Hope This Helps

Have A Great Day

~Zero~

Answer:

Answer is True

Explanation:

Answer: 54 g

Explanation:

Answer: Potassium iodide

Explanation: