Which statement is true about the potential energy diagram for an endothermic reaction? (5 points)
The potential energy of the products is equal to the potential energy of the reactants.
It starts at a higher energy value and ends at a lower energy value.
The energy value remains the same throughout the diagram.
Products have more potential energy than reactants.

Answer:

0.0710

Explanation:

Basedon the data provided, the concentration of the standardized titrant is 0.142 M.

A standard solution is a solution of known concentration.

The concentration of the standardized titrant is calculated from the mole of KHP required.

Moles of KHP = 0.7625 g/ 204.22 g/mol

Moles of KHP = 0.00373 mol

Mole ratio of KHP and NaOH is determined from the equation of the reaction below:

Therefore, moles of NaOH = 0.00373 moles

Molarity of a NaOH = moles/volume in L

volume of titrant = 26.32 mL = 0.02632 L

Molarity of NaOH = 0.00373/0.02632

Molarity of NaOH = 0.142 M

Therefore, the concentration of the standardized titrant is 0.142 M.

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Answer:

The mass of ammonium sulfate would be 8.86 x 1024 grams.

Explanation:

Ammonium sulfate is composed of four atoms of oxygen (O) and two atoms of nitrogen (N). Therefore, 4.43 x 1024 oxygen atoms would require 8.86 x 1024 grams of ammonium sulfate.

Ammonium sulfate is an inorganic compound composed of two nitrogen atoms (N) and four oxygen atoms (O). The molecular formula for ammonium sulfate is (NH4)2SO4.

This means that for every two nitrogen atoms, there are four oxygen atoms. Therefore, for 4.43 x 1024 oxygen atoms, there would be 8.86 x 1024 grams of ammonium sulfate required.

Answer:

Option B. 384 nm

Explanation:

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

Frequency (f) = 7.81×10¹⁴ Hz

Velocity of photon (v) = 3×10⁸ m/s

Wavelength (λ) =?

The wavelength of the photon can be obtained as follow:

v = λf

3×10⁸ = λ × 7.81×10¹⁴

Divide both side by 7.81×10¹⁴

λ = 3×10⁸ / 7.81×10¹⁴

λ = 3.84×10¯⁷ m

Finally, we shall convert 3.84×10¯⁷ M to nm. This can be obtained as follow:

1×10¯⁹ m = 1 nm

Therefore,

3.84×10¯⁷ m = 3.84×10¯⁷ m × 1 nm / 1×10¯⁹ m

3.84×10¯⁷ m = 384 nm

Thus, the wavelength of the photon is 384 nm

Answer:

B. 28.1 amu

Explanation:

Answer:  Blue whales, like humans, obtain molecules from food and air through a process of digestion and respiration. During digestion, molecules in food are broken down and absorbed into the bloodstream, while during respiration, oxygen molecules in the air are absorbed into the bloodstream. Both processes enable blue whales to obtain the necessary molecules for energy, growth, and development.

The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.

Mathematically,

Molarity= number of moles of solute/volume of solution in litre

Substituting values in equation 1

0.4M=number of moles of solute/0.25

number of moles of solute=0.025moles

Therefore, 0.025  is the number of moles of K+ ions are present in 250 mL of a 0.4M KCl solution.

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Answer:

Option C, 3 molecule is correct

Explanation:

The formula is of Ferric oxide

3Fe2O3

The number 3 ahead the chemical formula represents the number of molecules of the given substance. In general the formula of iron (III) oxide is Fe2O3

Since there are three molecules of it hence the formula is written as 3Fe2O3

Option C, 3 molecule is correct

By applying Boyle's law, the new volume of this gas is equal to: D. 4.0 L.

Given the following data:

Initial volume = 3.0 L.

New pressure = 1.5 atm.

Initial pressure = 2.0 atm.

In order to calculate the new volume of this gas, we would apply Boyle's law. Mathematically, Boyle's law is given by this formula:

PV = k

P₁V₁ = P₂V₂

Where:

Making V₂ the subject of formula, we have:

V₂ = (P₁V₁)/P₂

Substituting the given parameters into the formula, we have;

V₂ = (2.0 × 3.0)/1.5

V₂ = 6.0/1.5

V₂ = 4.0 L.

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Answer:

D. 4.0 Liters

Explanation:

I took the exam

Answer:

i think thats correcr!

Explanation:

Answer:

Ni2+ is reduced at the cathode.

The anode reaction could be Cr -> Cr3+ + 3e-

As the cell runs, anions will migrate from the Ni2+|Ni compartment to the other compartment.

Explanation:

As we know, in a galvanic cell, oxidation occurs at the anode and reduction occurs at the cathode. Hence at the cathode, nickel is reduced as follows;

Ni^2+(aq) + 2e ----> Ni(s)

Considering the reduction potential of the Ni2+ | Ni half cell (-0.25 V) and that of the Cr3+/Cr half cell (-0.74 V), the later has a more negative reduction potential and will most likely serve as the anode of the galvanic cell.

Lastly, the reduction of Ni^2+ leads to a build up of anions in the cathode compartment. To maintain neutrality in the cell, some anions migrate to the other compartment.

Answer:

yes

Magnesium (Mg) combines with chlorine (Cl2) to form a new product as magnesium chloride (MgCl2). Therfore its a combination reaction and the balanced equation can be written as: Mg(s)+Cl2(g)→MgCl2(s)

Answer:

Get a controlled environment, such as a pool or even a bowl. Pour some oil in it then you can test your solutions without causing any damage.

Explanation:

Answer: I believe its two

Explanation:

Answer:

1. The final temperature of the metal is 111 °C.

2. The change in the temperature of the water is 6.2 °C

3. The change in the temperature of the metal is 40.6 °C.

Explanation:

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

Initial temperature of metal (Tₘ₁) = 70.4 °C

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

1. Determination of the final temperature of metal.

We'll begin by calculating the change in temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of metal (ΔTₘ) =?

ΔTₘ = Tₘ₁ – Tₑ

ΔTₘ = 70.4 – 29.8

ΔTₘ = 40.6 °C

Finally, we shall determine the final temperature of the metal. This can be obtained as follow:

Initial temperature of metal (Tₘ₁) = 70.4 °C

Change in temperature of water (ΔTₘ) = 40.6 °C

Final temperature of metal (Tₘ₂) =?

40.6 = Tₘ₂ – 70.4

Collect like terms

40.6 + 70.4 = Tₘ₂

111 = Tₘ₂

Tₘ₂ = 111 °C

Thus, the final temperature of the metal is 111 °C

2. Determination of the change in the temperature of the water.

Initial temperature of water (Tᵥᵥ₁) = 23.6 °C

Equilibrium temperature (Tₑ) = 29.8 °C

Change in temperature of water (ΔTᵥᵥ) =?

ΔTᵥᵥ = Tₑ – Tᵥᵥ₁

ΔTᵥᵥ = 29.8 – 23.6

ΔTᵥᵥ = 6.2 °C

Therefore, the change in the temperature of the water is 6.2 °C

3. Determination of the change in the temperature of the metal.

The change in the temperature of the metal is 40.6 °C.

Please solution 1 above for explanation.

Answer:

29.8 C

6.2 C

-40.6 C

:)

Explanation:

Answer:

Explanation:

Atomic weight of strontium ( Sr ) is 88 .

Atomic weight of Beryllium ( Be) is 9 .

Both are bivalent .

2 x 96500 coulomb is required to decompose 88 g of Sr .

88 g of Sr requires 2 x 96500 coulomb of charge

20 g of Sr will require   2 x 96500 x 20 / 88 coulomb of charge

coulomb of charge required = 43863.63 coulomb .

9 g of Be requires 2 x 96500 coulomb of charge

2 x 96500 coulomb of charge gives  9 g of Be

43863.63 coulomb .of charge gives 9 x 43863.63 / (2 x 96500 ) g of Be

= 2.04 g.

The organic compound 3-hexanone can be prepared from ethylene using the second method given in the options.

3-hexanone is an organic compound classified to the ketones. Ketones are compounds with C=O group. 3-hexnone has the carbonyl group in the third carbon in the chain.

3- hexanone can be synthesized alkene sources by first converting them to alkynes. This process is oxidation. Ethylene can be oxidized to ethyne by treating with HBr and NaNH2 followed by hydrolysis.

The obtained higher alkyne or hexyne undergone acid hydrolysis in presence of sulphuric acid giving 3-hexanone.

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Answer:

Why do chemists use the mole as a counting unit? Because chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance. ... The discovery enabled scientists to classify certain chemical reactions as transfers of electrons between atoms.Explanation:

Chemical reactions often involve large numbers of small particles, chemists use a counting unit called the mole to measure amounts of a substance.

It is not possible to vell with a single atom or molecule because we

can't count them.

Chemists have set a number of particles with which to toil that is convenient. As molecules are very small.

Thus,  chemists use a counting unit called the mole to measure the amounts of a substance.

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Answer:

Electrolysis is the passing of a direct electric current through an electrolyte producing chemical reactions at the electrodes and decomposition of the materials. The main components required to achieve electrolysis are an electrolyte, electrodes, and an external power source.

Explanation:

Answer:

In chemistry and manufacturing, electrolysis is a technique that uses direct electric current to drive an otherwise non-spontaneous chemical reaction. Electrolysis is commercially important as a stage in the separation of elements from naturally occurring sources such as ores using an electrolytic cell.

hope it helps uh....

I am new here...

thanks ^^

Answer:

The key difference between linear and bent molecules is that linear molecules have atoms bonded to each other, forming a straight molecule, whereas bent molecules have atoms arranged in a bend-shape with an angle. The terms linear molecules and bent molecules describe the shapes of different molecules.

Explanation:

bcz of molecules ............

3.00 x 108 m/s should be written in scientific notation. Medical Notation (numbers less than 1.0) Add a decimal place after the decimal, to the right. To the left of the decimal point, there should only be one number. The brand-new number ranges from 1.0000 to 9.9999.

For the purpose of providing an exact result, certain elements of scientific notation must be included. In scientific notation, all numbers have the format "m x 10n. Important components for determining the scientific notation include the following:

Decimal: You move the decimal a specific number of times to the right or left of the coefficient to discover the scientific notation until it becomes a number equal to or greater than one and less than 10.

Coefficient: To calculate this value, the decimal point must move a predetermined amount of times. An amount that is one or larger and less than ten is referred to as a coefficient.

Base: The base number is always 10. The exponent comes into play when multiplying to arrive at the final solution.

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Answer:

Explanation:

Dear student, there is no sufficient information to calculate the empirical formula but we will explain what Empirical Formula is all about.

An empirical formula is made up of symbols that denote the elements in a complex, such as H for hydrogen and O for oxygen, as well as subscripts that indicate the number of atoms from each constituent element.

The empirical formula is the atoms in a complex with the lowest whole number ratio. The precise number of atoms in a single molecule is not necessarily shown.

Answer:

3.25×10²⁴ molecules

Explanation:

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

Mass of H₂O = 97.2 g

Number of molecule of H₂O =?

From Avogadro's hypothesis, we understood that:

1 mole of H₂O = 6.02×10²³ molecules

Next, we shall determine the mass of 1 mole of H₂O. This can be obtained as follow:

1 mole of H₂O = (2×1) + 16

= 2 + 16

= 18 g

Thus,

18 g of H₂O = 6.02×10²³ molecules

Finally, we shall determine the number of molecules in 97.2 g of H₂O. This can be obtained as follow:

18 g of H₂O = 6.02×10²³ molecules

Therefore,

97.2 g of H₂O = 97.2 × 6.02×10²³ / 18

97.2 g of H₂O = 3.25×10²⁴ molecules

Thus, 97.2 g of H₂O contains 3.25×10²⁴ molecules.

Answer:

See explanation.

Explanation:

Hello there!

In this case, considering the given information, it is not possible to figure out such order of reaction with respect to water as it is not involved in the given chemical reaction:

2E(g)+ F(g)+O(g)_

However, we can say that the order of reaction is 2 with respect to E (power of 2 in the rate law), 1 with respect to F (power of 1 in the rate law) and 0 with respect to O (power of 0 or not present in the rate law).

Regards!

Answer:

Step 1: Use the kn*fe to cut the rubber tubing into two pieces.

Step 2: Use one plastic bag to filter the pond's murky water. Place the bag over the plastic cup and pour the water into it.

Step 3: Place the filtered water from the plastic bag into the 5-L glass bottle.

Step 4: Add a few drops of the liquid bleach to the water in the glass bottle.

Step 5: Place the nylon jacket over the top of the glass bottle and secure it with the rubber tubing.

Step 6: Place the glass bottle in direct sunlight and let it sit for at least an hour.

Step 7: Remove the nylon jacket and rubber tubing from the glass bottle.

Step 8: Use the second plastic bag to filter the water from the glass bottle.

Step 9: Enjoy the drinkable water!

Explanation:

Answer:

B. Chlorine gas is yellow-green in color.

Answer: The answer is Conduction

Answer:

Conduction

Explanation:

Conduction happens when materials or objects are in direct contact with each other. The molecules in the warmer object vibrate faster than the ones in the cooler object.

Because of their different longitude.