in the reduction of 1 mole of O2 to H2O by the enzym laccase, how many moles electrons are transferred?a. 1b. 2c. 4d. 6

Answer:

The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.

Answer:

1. LiCi is formed by the treatment of lithium carbonate with hydrochloric acid

2. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).  

3. Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.

4. A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound

5. Double replacement reactions have two ionic compounds that are exchanging anions or cations.

6. The most electronegative elements are found on the top right of the periodic table.

7. cesium

8. Electronegativity describes the degree to which an atom attracts electrons in a chemical bond. But the electronegativity of two atoms would determine their bond type.

9. ionic bond

10. polar covalent bond

11. fluorine

12. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change.

Hope i was able to help!!!

The system was closed in which combustion experiment conducted. Thus, option D is correct.

A closed system is a system in which there is only transfer of energy is takes place this type of system is known as closed system.

Example - Transfer of heat from a cup of tea.

Mainly there are three type of system.

1:- Open System

2:- Closed System

3:- Isolated System

Open system:-

A system in which there is transfer of both energy and mass these types of system is called as open system.

Example:- Flow of water in a canals

Closed System:-

A  system in which there is only transfer of energy is takes place this type of system is known as closed system.

Example - Transfer of heat from a cup of tea.

Isolated system:-

A system in which there is no transfer of energy and mass these type of system is called as isolated system.

Example - A thermo flask

Therefore, the system was closed in which combustion experiment conducted. Thus, option D is correct.

The complete question is : At the start of the coal combustion experiment, the mass was 100 grams. At the end of the coal combustion experiment, the mass was 100 grams. During the combustion experiment, heat was transferred from the reaction vessel to the area surrounding the reaction vessel. What type of system was this combustion experiment conducted in?

A. isolated

B. insulated

C. open

D. closed

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Answer:

D.) 2,200 kJ

Explanation:

To find the energy needed to vaporize aluminum, you need to multiply the given mass (2 kg) by the latent heat of vaporization conversion (via table). You know your answer is correct if the units cancel out.

2 kg aluminum                1,100 kJ
-------------------------  x  ------------------------  = 2,200 kJ
                                   1 kg aluminum

**I apologize if there was another way using the equation **

The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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84.2 ml of 0.120 m HCL are needed to completely neutralize 50.0 ml of 0.101 m Ba(OH)2 solution.

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Answer:

Explanation:

Ice tea

Salt water

Orange juice

The relative retention for compounds A and B if the retention time for A (ta) is 3.91 min, the retention time for (tb) is 6.42 min, and the tm is 1.34 min is 1.98 (Option C).

To calculate the relative retention for compounds A and B, we will first determine the adjusted retention time for both compounds, and then divide the adjusted retention time of compound B by that of compound A. The terms we will use are retention time for A (t_a), retention time for B (t_b), and the hold-up time (t_m).

Step 1: Calculate the adjusted retention time for compounds A and B.

Adjusted retention time for A (t'_a) = t_a - t_m

Adjusted retention time for B (t'_b) = t_b - t_m

Step 2: Plug in the given values.

t'_a = 3.91 min - 1.34 min = 2.57 min

t'_b = 6.42 min - 1.34 min = 5.08 min

Step 3: Calculate the relative retention.
Relative retention (R) = t'_b / t'_a

Step 4: Plug in the adjusted retention times.

R = 5.08 min / 2.57 min = 1.98

The relative retention for compounds A and B is 1.98. Therefore, the correct answer is option C.

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The product for the given reaction sequence would be: 3,4-dimethyl-7-nonanol.

The first reaction involves the conversion of 6,7-dimethyl-3-nonanol to 6,7-dimethyl-3-nonanone using PBr3 and then further oxidizing it to 6,7-dimethyl-3-nonanal using PCC.

In the second step, the resulting 6,7-dimethyl-3-nonanal is treated with H3O+ to form the final product, that is:

3,4-dimethyl-7-nonanol.

Based on the reaction sequence provided, the product for this reaction is 6,7-dimethyl-3-nonanone.

The initial reaction involves PBr3 to replace the OH group with a Br, then Mg/ether forms a Grignard reagent, followed by the addition of H30+ to protonate the oxygen, and finally, PCC oxidizes the alcohol to a ketone.

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The product for the given reaction sequence would be: 3,4-dimethyl-7-nonanol.

The first reaction involves the conversion of 6,7-dimethyl-3-nonanol to 6,7-dimethyl-3-nonanone using PBr3 and then further oxidizing it to 6,7-dimethyl-3-nonanal using PCC.

In the second step, the resulting 6,7-dimethyl-3-nonanal is treated with H3O+ to form the final product, that is:

3,4-dimethyl-7-nonanol.

Based on the reaction sequence provided, the product for this reaction is 6,7-dimethyl-3-nonanone.

The initial reaction involves PBr3 to replace the OH group with a Br, then Mg/ether forms a Grignard reagent, followed by the addition of H30+ to protonate the oxygen, and finally, PCC oxidizes the alcohol to a ketone.

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Answer:

0.184 mol

Explanation:

Look up molar masses for the elements that comprise H₃PO₄:

H = 1.008 g/mol

P = 30.97 g/mol

O = 15.99 g/mol

The molar mass of H₃PO₄ is a weighted sum of these (3 hydrogen + 1 phosphorus + 4 oxygen) that comes out to about 97.99 g/mol.

Then

(18 g H₃PO₄) × (1/97.99 mol/g) ≈ 0.1837 mol

Answer:The explanation is true

Directly proportional is like temperature and volume

V=kT  as Temp increases, volume increases

Inversely proportional is like pressure and volume

VP=k  as P increases, V decreases.

since wavelength time frequency is the speed of light,

wavelength and frequency are inversely proportional

lf=c

Explanation:

In electromagnetic waves, the frequency and wavelength are inversely proportional, which means if one gets larger, the other must get smaller. ...

Answer:

2Na + 2HCl → 2NaCl + H2

PbCl2 + Li2SO4 = LiCl + PbSO4

Zn(S) + AgNO3(Aq) = ZnNO3(Aq) + Ag(S)

The reaction order is given as the  relationship between the concentrations of the reactants and the rate of a reaction.

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Answer:

Las botellas de alcohol vienen en una variedad de tamaños. El estándar es de 750 ml, que también se conoce como "un quinto" porque es 1/5 de galón. Otros tamaños comunes de botellas de alcohol son 50ml, 100ml, 200ml, 375ml, 1L y 1.75L.

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 6.55 cm³ = 6.55 mL

density = 7.2 g/mL

We have

mass = 7.2 × 6.55

We have the final answer as

Hope this helps you

Answer:

Sorry I can only do the first one but,

Explanation:

the first one is c

Answer:

i did this assignment today, so u and i might be classmates :3 answer is shown below in 'explanation.'

Explanation:

the roller coaster assignment: force: 160 newtons. distance: 40 m high. time: 10 sec. work: 6400. average speed: 4 km.

for the whale assignment: force: 800 newtons. Distance: 10 meters. time: 3.5 seconds. work: 8,000 J. Average speed: 2.85

for the car: force: 1400 newtons. Distance: 800 m. time: 40 minutes. work: 1,120,000. average speed: 20.

moving company: force: 600. Distance: 80 m. time: 50 min. work: 48,000. average speed: 1.6.

I hope this is correct, bc i got 100% !! :3

Answer: I just added this so you can give the other person brainly

The number of moles in 14.5 grams of butane is 0.25 moles.

The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

moles = mass ÷ molar mass

According to this question, there are 14.5 grams of butane in a sample. The number of moles of butane in this sample can be calculated as follows:

Molar mass of butane = 58g/mol

moles = 14.5g ÷ 58g/mol

moles = 0.25moles

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Answer:

3.46

⋅

10

−

19

J

The energy of a photon is proportional to its frequency, as stated by the Planck - Einstein's equation

E

=

h

⋅

ν

, where

E

- the energy of the photon

h

- Planck's constant, equal to

6.626

⋅

10

−

34

J s

ν

- the frequency of the photon

Now, notice that you are given the wavelength of the photon,

λ

. As you know, frequency and wavelength have an inverse relationship described by the equation

λ

⋅

ν

=

c

, where

c

- the speed of light in vacuum, approximately equal to

3

⋅

10

8

m s

−

1

This means that the relationship between energy and wavelength looks like this

λ

⋅

ν

=

c

⇒

ν

=

c

λ

E

=

h

⋅

c

λ

Another important thing to notice here is that the wavelength of the photon is given in nanometers,

nm

. You need to convert this to meters, the unit used for the value of the speed of light.

E

=

6.626

⋅

10

−

34

J

s

⋅

3

⋅

10

8

m

s

−

575

⋅

10

−

9

m

=

3.46

⋅

10

−

19

J

Explanation:

Brainliest please?

To calculate the ratio of uranium-235 to lead-207 atoms in the mineral sample, we can use the atomic masses and the concept of radioactive decay.

The ratio of uranium-235 to lead-207 atoms in the mineral sample is 1:3.The atomic mass of uranium-235 (U-235) is approximately 235 atomic mass units (amu), while the atomic mass of lead-207 (Pb-207) is approximately 207 amu.

Given:

Number of uranium-235 atoms = 50,000

Number of lead-207 atoms = 150,000

To find the ratio, we divide the number of uranium-235 atoms by the number of lead-207 atoms:

Ratio = Number of uranium-235 atoms / Number of lead-207 atoms

Ratio = 50,000 / 150,000

Simplifying the ratio:

Ratio = 1/3

Therefore, the ratio of uranium-235 to lead-207 atoms in the mineral sample is 1:3.

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Answer: NaCl is an ionic compound

Explanation: Sodium Chloride is formed from Na+ and Cl- ions.

It is soluble in water, it has crystalline structure, it has high melting point and

It is insulator as solid form. Water solution leads current.

Answer:

Protons are the atomic number and for each element they never change.

Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)

Mass number is Protons+Nuetrons

Explanation:

When filling a buret for a titration, first adjust the buret in the clamp so that it is vertical. Then, choose an appropriate funnel to add the titrant into the buret. The titrant should be filled to just above the zero mark on the buret, and the buret tip should be briefly opened to remove any bubbles.

After that, the buret can be adjusted to the desired volume and the titration can proceed. It is important to take note of the initial buret reading before starting the titration to ensure accurate measurement of the titrant volume.

When filling a buret for a titration, it is important to first adjust the buret in the clamp so that it is vertical and its tip is below eye level to ensure accurate volume measurements. Next, choose an appropriate method to add the titrant into the buret, such as using a funnel or a pipette.

It is important to avoid splashing or spilling the titrant to ensure accurate and precise measurements. The titrant should be filled above the zero mark on the buret and then slowly drained until the bottom of the meniscus is aligned with the zero mark.

This process is called "buret priming" and it helps to remove any air bubbles from the buret tip that can affect the accuracy of the measurements. Once the buret is primed and filled with the titrant, it is ready to be used for the titration.

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To determine which metal sample has the largest volume among the given options, we need to compare their densities. The sample with the lowest density will have the greatest volume for a given mass.

Let's calculate the volumes of the metal samples using the formula:

Volume = Mass / Density

1) For aluminum: Mass = 100 g, Density = 2.7 g/cm^3

Volume of aluminum = 100 g / 2.7 g/cm^3 = 37.04 cm^3

2) For gold: Mass = 100 g, Density = 19.3 g/cm^3

Volume of gold = 100 g / 19.3 g/cm^3 = 5.18 cm^3

3) For iron: Mass = 100 g, Density = 7.86 g/cm^3

Volume of iron = 100 g / 7.86 g/cm^3 = 12.72 cm^3

4) For magnesium: Mass = 100 g, Density = 1.74 g/cm^3

Volume of magnesium = 100 g / 1.74 g/cm^3 = 57.47 cm^3

5) For silver: Mass = 100 g, Density = 10.5 g/cm^3

Volume of silver = 100 g / 10.5 g/cm^3 = 9.52 cm^3

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Answer:

false

Explanation:

Carbon atoms are found in hydrocarbons, naturally occurring compound with carbon and hydrogen, but there are molecules in nature that contain beside carbon and hydrogen, oxygen and nitrogen too. In this compounds there are carbon-oxygen and carbon-nitrogen covalent bonds.

Bellow you may see the chemical structure of adrenaline, a hormon found in the human body, were the oxygen (red) and nitrogen (blue) are bonded to carbon.

Answer:

false

Explanation:

Carbon atoms often naturally bond with each other in chains, rings, plates, or networks, and they also bond readily with hydrogen, oxygen, nitrogen, sulfur, phosphorus, and the halogens.

The molarity of the diprotic acid that requires 18.73 mL KOH is 1.405 M.

The chemical reaction between a diprotic acid and KOH is

H₂A + 2 KOH → K₂A + 2 H₂O

In stoichiometry, we learn the chemical reaction and the laws that work in it. According to Avogadro's law, the coefficient of a substance in a chemical reaction expresses the ratio of the number of moles of each substance.

\(M \:=\: \frac{n}{V}\)

n = MV

KOH

The number of moles for a diprotic acid

n KOH : n H₂A = 2 : 1
n H₂A = n KOH ÷ 2
n H₂A = 5.619 ÷ 2
n H₂A = 2.8095 mmol

The molarity of a diprotic acid

\(M \:=\: \frac{n}{V}\)
\(M \:=\: \frac{2.8095}{25.00}\)
M = 1.405 M

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Answer:

salt and oil

water and salt

water and sugar

Explanation:

The student is looking at a plant cell because a plant cell only has cell walls and chloroplast due to which they perform photosynthesis.

Photosynthesis is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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