A 0.7500 L solution has been boiled down to a new volume of 0.4510 L with a concentration of 2.033 M. What was the initial concentration of the solution?

Answer:

Varying frequency between both waves accounts for difference in speed.

Explanation:

The speed of a wave is dependent on four major factors:

Assuming equal temperature and medium of travel of these sound waves, and given that the wavelength (that is distance of travel) is equal, the only varying factor would be their frequency.

Wave speed is calculated by multiplying the wavelength times the frequency

⇒ Speed = λ * f

Answer:

Faster one has a lower frequency and higher wavelength.

Explanation:

The waves have properties such as frequency and wavelength. If the distance they travel is the same but one wave is faster than the other one, the faster wave must have a lower frequency and higher wavelength as it can be seen in this graph from Encyclopedia Britannica.

I hope this answer helps.

Answer:

0.083 moles KCl

Explanation:

We have 252 mL of 0.33 M KCl. "M" is molarity, and it's measured in mol/L. Since we know the molarity is 0.33 mol/L, in order to find how many moles 252 mL is, we need to multiply our given volume by the molarity.

However, our given volume is in mL, so let's convert to L first by dividing 252 by 1000 (because there are 1000 mL in 1 L):

252/1000 = 0.252 L

Now, we can multiply 0.252 L by 0.33 mol/L to get moles since the L units will cancel out:

0.252 L * 0.33 mol/L = 0.08316

We have two significant figures here, so round 0.08316 to 0.083.

The answer is 0.083 moles.

Hope this helps!

Answer:

Keq for the new temperature is 26.8

Explanation:

Let's propose the equilibrium:

2IF₅ +  I₄F₂  ⇄  3I₂  +  6F₂

Now we propose the situations:

                2IF₅     +      I₄F₂    ⇄    3I₂   +     6F₂

Initial      6 mol           8 mol           -              -

Initially we added 6 mol and 8 mol of our reactants  

React.        x                 x/2           3/2x         3x

By stoichiometry x amount has reacted, so a half of x react to the I₄F₂ and we finally produced 3/2x and 3x in the product side

Eq.          (6 - x)        (8 - x/2)        3/2x          3x

Notice we have the concentration left for the I₄F₂, so we can find the x value, the amount that has reacted:

8 - x/2 = 6

x = 4, so the concentrations in the equilibrium are:

2 moles of IF₅, 6 moles I₄F₂, 6 moles of I₂ and 12 moles of F₂

As we need molar concentration to determine Keq, we must divide the moles by the volume of the container:

2/10 = [IF₅] → 0.2 M

6/10 = [I₄F₂] → 0.6 M

6/10 = [I₂] → 0.6 M

12/10 = [F₂] → 1.2 M

Let's make, expression for Keq:

Keq = ([I₂]³ . [F₂]⁶) / [IF₅]² . [I₄F₂]

Keq = 0.6³ . 1.2⁶ / 0.2² . 0.6 → 26.8

Answer:

Acid: [Al(H₂O)₆]³⁺

Base: H₂O

Conjugate base: [Al(H₂O)₅(OH)]²⁻

Explanation:

(a) For the reaction:

[Al(H₂O)₆]³⁺  + H₂O  ⇄  H₃O⁺ + [Al(H₂O)₅(OH)]²⁻

The acid: [Al(H₂O)₆]³⁺

The base: H₂O

The conjugate base: [Al(H₂O)₅(OH)]²⁻    

According to the Bronsted-Lowry acid-base theory, the reaction of an acid and base occurs by the exchange of a proton. The acid forms its conjugate base, and the base forms its conjugate acid in the reaction.

Hence, by the above definition, the [Al(H₂O)₆]³⁺ is the acid that forms its conjugate base [Al(H₂O)₅(OH)]²⁻ and the H₂O is the base that forms its acid conjugate H₃O⁺ when they react and the  [Al(H₂O)₆]³⁺ lose a proton to the H₂O.  

I hope it helps you!

Answer:

it has 3 valence electrons

Explanation:

2+2+1 is 5, boron is 5 and its in the 3rd group

0.0047 M is the molarity of the NaCl solution.

A mole is defined as 6.02214076 × 10^{23} of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

0.450 moles of NaCl are dissolved in 95.0 mL of water

[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

[tex]Molality = \frac{0.450}{95.0 mL}[/tex]

Molality = 0.004736842105 M = 0.0047 M

Hence, 0.0047 M is the molarity of the NaCl solution.

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To find the molarity of a NaCl solution with 0.450 moles of NaCl in 95.0 mL of water, divide the moles by the liters of solution to get a molarity of 4.74 M.

The question asks to calculate the molarity of a NaCl solution when 0.450 moles of NaCl are dissolved in 95.0 mL (0.0950 L) of water. To calculate the molarity (M), which is defined as the number of moles of solute per liter of solution, we use the formula:

M = moles of solute / liters of solution

Substituting the given values: M = 0.450 moles / 0.0950 L = 4.74 M

This means the molarity of the NaCl solution is 4.74 M.

Answer:

0.425

Explanation:

Answer:

0.452

Explanation:

Answer:

ΔH = -601.9 kJ/ mol Mg

Explanation:

Step 1: Data given

Mass of the solid magnesium sample = 0.2475 grams

The heat capacity of calorimeter = 3024 J/°C

The temperature increases by 2.027 °C

Step 2: Calculate the heat transfer

q = Ccal * ΔT

⇒with q = the heat transfer

⇒with Ccal = the heat capacity of calorimete 3024 J/°C

⇒ΔT = The temperature increases by 2.027 °C

q = 3024 J/°C * 2.027 °C

q = 6129.6 J

Since this is an exothermic reaction, ΔH will be negative

Step 3:Calculate the heat associated with the burning of Mg

Heat = -6129.6 J / 0.2475 grams Mg

Heat = 24766 J/grams = -24.77 kJ /grams Mg

Heat = -24.77 kJ/ grams * 24.3 g/mol

ΔH = -601.9 kJ/ mol Mg

Answer:

So Carbon-14 has eight neutrons and Carbon-12 has six neutrons. Hope it helps!

Answer:

A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons.

Answer:

= 25 %

Explanation:

Given that :

the genotype attributed to  trolls having one eye  = (EE, Ee);  that is homzygous dominant or heterozygote dominant for eye number

Likewise those that posses two eyes have (ee) ; that is homzygous recessive

Now; two heterozygous one eyed trolls are crossed ; we have :

Ee  × Ee

The punnet square for this cross looks like what we have below:

               E                e

E              EE              Ee

e              Ee               ee

From the above cross; we have:

1   EE    ---- (homozygous dominant ) indicating troll having one eye

2  Ee    ---- ( heterozygote dominant ) indicating troll having one eye

1  ee    ----- ( homozygous recessive ) indicating troll having two eyes

The genotypic ratio is 1:2:1

Thus; the expected genotype ratio of the two eyed offspring = [tex]\frac{1}{4}*100[/tex]

= 25 %  

Answer:

25% is the expected genotype ratio of the two-eyed offspring.

Explanation:

║ E ║ e ║

E║ EE ║ Ee ║

e ║ eE ║ ee ║

Answer : The required bond energy per mole for breaking all the bonds in methane is, 1656 kJ/mol

Explanation :

The given compound is, [tex]CH_4[/tex].

Methane compound breakdown into 4 C-H bonds.

Given:

[tex]B.E_{C-H}[/tex] = 414 kJ/mol

The expression will be:

[tex]\Delta H_{CH_4}=4\times (B.E_{C-H})[/tex]

[tex]\Delta H_{CH_4}=4\times (414kJ/mol)[/tex]

[tex]\Delta H_{CH_4}=1656kJ/mol[/tex]

Therefore, the required bond energy per mole for breaking all the bonds in methane is, 1656 kJ/mol

Answer:

The answer to your question is below

Explanation:

I will write the answers assigning numbers to each column

Isotope           Nuclear form         1       2       3        4      5

Boron-10              ¹⁰B                   5      10      5        5      5

Potassium-37      ³⁷K                   19     37      19      18     19

Boron-11                ¹¹B                   5      11       5       6      5

Silver-107            ¹⁰⁷Ag               47     107    47      60    47

Uranium-238     ²³⁸U                 92   238    92    146   92

Oxygen-17            ¹⁷O                  8      17       8        9       8

Silver-108           ¹⁰⁸Ag               47    108    47       61    47

Answer: 0.029 mol

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

The balanced chemical equation is:

[tex]C_{12}H_{22}O_{11}+12O_2\rightarrow 12CO_2+11H_2O[/tex]

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{10.0g}{342g/mol}}=0.029moles[/tex]

Thus there are 0.029 moles of sucrose

Answer:

A

Explanation:

Answer:

Explanation:

Covalent catalysis is when a transient covalent bond is formed between substrate and residues such that so the enzyme nucleophilic group on an electrophilic moiety of the substrate is bound at the active site. Metal ion catalysis involves activating bound water through forming nucleophilic hydroxide ion.

Protonation or proton abstraction may be accomplished through the use of amino acids such as aspartate or Lysine in acid-base catalysis.

The term Catalysis is defined as the process of adding a catalyst to facilitate a reaction. During a chemical reaction, the bonds between the atoms in molecules are broken, rearranged, and rebuilt, recombining the atoms into new molecules.

Catalysis by covalent bonds the two-part catalytic process forms a covalent bond between enzyme and substrate (for example, chymotrypsin mechanism uses a nucleophilic functional group).

By changing the oxidation state, metal ion catalysis catalysts can participate in oxidation-reduction reactions.

Through ionic interactions, a Zn2+ cofactor may properly orient the substrate in the active site. May be involved in Fe2+ interactions.

All lowers activation energy or stabilizes the transition state or intermediate catalyst after the reaction occurs.

Thus, a proton is transferred between enzyme and substrate may use amino acids such as aspartate or Lysine for protonation or proton abstraction is called as acid-base catalysis.

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Your question is incomplete, most probably your question was

Enzymes use several types of catalytic mechanisms. Differentiate between acid-base catalysis, covalent catalysis, and metal ion catalysis.

Answer:

Square planar

Explanation:

Ni^2+ is a d8 ion. It could exist in either a square planar or a tetrahedral geometry depending on the identity of the ligand. However, strong field ligands often lead to a square planar geometry owing to a greater crystal field splitting.

From the splitting diagrams of nickel II ion in tetrahedral and square planar geometries, it can easily be seen that a diamagnetic complex only arises from the square planar geometry.

Note that both tetrahedral and square planar geometries involve a coordination number of four.

Answer:

initial temperature of metal : 100

initial temperature of water : 22.4

final temp of both 27.1

Explanation: that one is for aluminum so i don’t know which metal you needed if for though

Answer:

Initial metal= 100

Initial water= 22.7

Final Both= 24.6

Explanation: THESE ARE FOR COPPER

Answer:

Explanation:

combustion

Answer:

Sulphur is the element having atomic number 16. Its valency is 6 and forms anion.

Explanation:

Sulphur is the element having atomic number 16 and mass number 32 which means sulphur has 16 proton, 16 electron and 16 neutron. 2 electrons are present in the first shell, 8 electrons are present in the second shell and 6 electrons are present in the outermost shell. Sulphur requires 2 electrons to become stable so that's why sulphur take 2 electrons and become anion. its valency is 6 which means 6 electrons are present in the outermost shell of sulphur atom.

The new volume of the soccer ball is 9 litres when temperature inside the can was 25°C and pressure remained constant.

Explanation:

Data given:

initial volume of the ball, V1 = 3.6 litres

temperature of the field, initial temperature, T1 = 10°C

temperature in the trash can, final temperature, T2 = 25 °C

pressure =constant throughout

volume of the ball when in trash can, final volume V2 =?

From the data given:

Charles' Law will be applied to know the volume of the ball in the can:

[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]

putting the values in the equation after rearranging it:

V2 = [tex]\frac{V1T2}{T1}[/tex]

V2 = [tex]\frac{3.6 X 25}{10}[/tex]

V2 = 9 litres

The volume will be increased to 9 litres when ball will go inside the trash can.

Answer:

77.248 L

Explanation:

From the question,

Work done on the gas mixture is given as,

W = PΔV.................. Equation 1

Where W = work done, P = pressure of the the gas, ΔV = Change in volume of the gas.

make ΔV the subject of the equation

ΔV = W/P..................... Equation 2

Given: W = 28.2 J, P = 0.37 atm = (0.37×101325) N/m² = 37490.25 N/m²

Substitute into equation 2

ΔV = 28.2/37490.25

ΔV = 0.000752 m³

ΔV = 0.752 L

But,

ΔV = V₂-V₁................. Equation 3

Where V₂ = Final volume of the helium gas, V₁ = Initial volume of the helium gas

make V₁ the subject of the equation

V₁ = V₂-ΔV................ Equation 4

Given: V₂ = 78 L.

Substitute into equation 4

V₁ = 78-0.752

V₁ = 77.248 L

Answer:

The initial volume of the helium gas balloon was 1.78 L

Explanation:

Step 1: Data given

Volume of the balloon is expanded to 78.0 L

The pressure is held constant at 0.37 atm

If the work done on the gas mixture was 28.2 J

Step 2: Calculate the initial volume

W = pΔV

⇒W = the work done on the gas = 28.2 J

⇒p = the pressure = 0.37 atm

⇒ΔV = the change in volume = V2 - V1 = 78.0 L - V1

W = 0.37 * ( 78.0 - V1)

28.2 J = 0.37 * ( 78.0 - V1)

28.2 J = 28.86 - 0.37V1

-0.66 = -0.37V1

V1 = 1.78 L

The initial volume of the helium gas balloon was 1.78 L

Answer:

D) 18

Explanation:

Hello,

In this case, by considering the given rate law:

[tex]r=k[A]^2[B][/tex]

We also take into account that the concentration of A is tripled and the concentration of B is doubled, therefore, we have:

[tex]r=k[3*A]^2[2*B][/tex]

Which results in an increasing factor of:

[tex]3^2*2=9*2=18[/tex]

By considering only the tripling and the doubling, thus, the answer is D) 18.

Regards.

Answer:

C) They have 12-20 carbon atoms and an even number of carbon atoms.

Explanation:

Fatty acid is described as Carboxylic acid that contains the structural component of lipids

fats and oils. Fatty acids are unbranched and usually have 12-20 carbon atoms evenly. They are known by their number of carbon-to-carbon double bonds present.

For saturated fatty acids, they don't have any carbon-to-carbon double bonds. Fatty acid can be classified based on the number of carbon-to-carbon, such as; monounsaturated fatty acids which have one carbon-to-carbon double bond and also polyunsaturated fatty acids which have contain more than carbon-to-carbon double bonds

Some natural fatty acid

1.)Lauric acid (C11H23COOH)

2.)Palmitic acid (C15H31COOH)

3.)Myristic acid (C13H27COOH)

4.) Linoleic acid (C17H31COOH)

5.) Arachidonic acid(C19H31COOH)

Answer:

'L' is the variable for this number.

A geographically distant species is a green gopher snake that dwells in the grass and a brown rat snake that dwells in the desert.

These species don't have any viable progeny.

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The green and brown rat snakes demonstrate camouflage, a biological adaptation for survival. Camouflage helps them blend into their respective environments, thus evading predators. Anyone considering a snake as a pet must provide an appropriate diet, remembering the potential ecological impact snakes can have when introduced into non-native environments.

A green rat snake that lives in the grass and a brown rat snake that lives in the desert is an example of camouflage, which is a form of adaptation where an organism has evolved to blend in with its environment to increase its chances of survival and reproduction. This can be a result of natural selection, where those that can avoid being seen by predators are more likely to survive and pass on their genes. The brown rat snake in the desert is camouflaged against the sandy environment, while the green rat snake blends with the greenery in the grasslands.

Knowing that snakes are carnivorous and some species such as the rat snake are beneficial to humans for controlling pest populations, it's important for anyone considering a snake as a pet to be prepared to feed it a diet consisting of appropriate live or raw prey. It is also noteworthy that in some instances, snakes like the brown tree snake have caused ecological issues when introduced to new environments without natural predators, such as on the island of Guam.

Answer: Matter cannot be created or destroyed

Explanation: Balanced equations are set equations we cannot change one element or compound in the equation without changing the entire equation. So balanced equation show the conservation of mass because while other substances may be formed from the synthesis or decomposition of compounds new elements are never introduced and are not created out of thin air    :)

Answer:

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

A chemical system in equilibrium has its reactants and products present in constant concentrations, as the forward and reverse reactions occur at equal rates in a closed system.

In a chemical system at equilibrium, the following is true:

Thus, the correct statement about a chemical system in equilibrium is that the amount of reactant changes but over time remains about the same, indicating that the reaction is dynamic with continuous forward and reverse processes.

Answer:

Chlorine bleach is strongly basic. We actually make it by dissolving chlorine gas in a concentrated solution of sodium hydroxide, which forms sodium hypochlorite and sodium chloride, in the following equilibrium.

Explanation:

Answer:

.

Explanation:

Aluminium is a silvery-white, lightweight metal. It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. This is because of its particular properties.

Answer: The pH of given solution is 3.74.

Explanation:

The given data is as follows.

 Mass of lactic acid = 8.52 g,    Formula weight of lactic acid = 90.08 g/mol

So, number of moles of lactic acid will be calculated as follows.

   No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]

                        = [tex]\frac{8.52 g}{90.08 g/mol}[/tex]

                        = 0.094 moles

   Mass of sodium lactate = 7.93 g,    Formula weight of sodium lactate = 112.06 g/mol

Hence, number of moles of sodium lactate is as follows.

    No. of moles = [tex]\frac{mass}{\text{molar mass}}[/tex]

                        = [tex]\frac{7.93 g}{112.06 g/mol}[/tex]

                         = 0.071 moles

As we know that relation between [tex]K_{a}[/tex] and [tex]pK_{a}[/tex] is as follows.

    [tex]pK_{a} = -log K_{a}[/tex]

                 = -log(0.000137)

                 = 3.86

Using Henderson equation, we will calculate the pH as follows.

      pH = [tex]pK_{a} + log (\frac{\text{Conjugate base}}{\text{Acid}})[/tex]

      pH = [tex]3.86 + log (\frac{\text{sodium lactate}}{\text{lactic acid}})[/tex]

           = [tex]3.86 + log (\frac{0.071}{0.094})[/tex]

            = 3.86 + log (0.755)

            = 3.86 - 0.121

           = 3.74

Therefore, we can conclude that pH of given solution is 3.74.