The three dienes(red) associated with compound A - C do not react similarly with a dienophile. One diene has a low activation barrier and reacts rapidly; one diene has a high activation barrier and any product formed will be highly reactive; and one diene is inactive. Select the answer that lists dienes A, B, and C from most reactive toward a Diels-Alder reaction to unreactive.

A) c,b,a
B) a,b,c
C) a,c,b
D) b,a,c

Answer:

lungs

Explanation:

The instrument to measure volume in the laboratory here is a graduated cylinder and volumes include, for example, 68 ml (1), 32,5 ml (2), 82 ml (3), etc.

A graduated cylinder is an instrument used in laboratories to measure the volume of a given solution, which is generally expressed as millimeter units (ml).

In this case, the millimeters can exactly determine the volume of liquid that will be used during the formulation of the solution.

In conclusion, the instrument to measure volume in the laboratory here is a graduated cylinder and volumes include, for example, 68 ml (1), 32,5 ml (2), 82 ml (3), etc.

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Answer:

Explanation:

I tried to figure it out but my head wasn’t working sorry

Answer:

26

Explanation:

The atomic number of an atom describes the number of protons within its nucleus. Since the ion has 26 protons, the atomic number must be 26.

Answer:

the water molecules have more energy and are moving faster than the molecules of cold water. This makes it easier for the dye to get mixed throughout the hot water.

Explanation:

Answer:

Because particles moves more by kinetic energy and diffusion will spread with the particles

Explanation:

The source of energy in nuclear power plants is optionD. Fission.

The source of energy in nuclear power plants is nuclear fission. Nuclear fission is the process in which the nucleus of an atom, typically a heavy element like uranium or plutonium, is split into two smaller nuclei, releasing a significant amount of energy in the process. This energy is harnessed to generate heat, which is then used to produce steam and drive turbines connected to generators, ultimately generating electricity.

In a nuclear power plant, controlled fission reactions occur in the reactor core, where nuclear fuel, such as uranium-235 or plutonium-239, is used as the fuel source. When these fuel nuclei undergo fission, they release high amounts of energy in the form of heat and also emit additional neutrons, which can sustain a chain reaction if properly controlled.

It's important to note that fusion (option A) is the process of combining two light atomic nuclei to form a heavier nucleus, which also releases a substantial amount of energy. However, fusion reactions have not yet been fully developed for practical energy generation in power plants.

Alpha decay (option B) is a type of radioactive decay where an atomic nucleus emits an alpha particle. Combustion (option C) refers to the process of burning a fuel in the presence of oxygen, which is not the mechanism utilized in nuclear power plants.The correct answer is d.

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Answer:

it develops from the womb

Answer:

outer cells of the blastocyst

Explanation:

on edg:)

The displacement of the hamster ball is equal to -5 feet. Therefore, option (B) is correct.

The displacement of an object can be demonstrated as the change in the position of an object. The displacement can be defined as the minimum length between the initial and the final point of an object.

The displacement can be defined as a vector quantity posses both direction of displacement and magnitude. Therefore, the measurement of the displacement of an object includes direction.

The S.I. unit of the displacement meters and the C.G.S. unit are centimeters the same as the distance.

A hamster in a ball starts its journey 5 feet to the left of a refrigerator, travels 20 feet to the right of the refrigerator, and ends its journey in front of the refrigerator.

Therefore, the displacement of the hamster ball is equal to -5 feet.

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When the combined vapour pressure of a miscible liquid mixture reaches atmospheric pressure, the solution boils. This vapour pressure denotes the boiling pressure in a mixture.

The air pressure directly impacts a liquid's boiling point. The weight of the air molecules above the liquid is the factor putting more pressure on the liquid. This is considered to as atmospheric pressure in an open system. The higher the boiling point and the more energy needed to bring liquids to a boil, the higher the pressure.

Because volatile compounds regularly have different boiling points, when a mixture is distilled, the components commonly separate from the mixture. The temperature at which the external pressure operating on the surface of a liquid equals the vapour pressure of the liquid phase of a compound is termed as the boiling point.

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Use the following formula to obtain the ascorbic acid content in milligrams of a vitamin C tablet:

Mass of ascorbic acid (mg) = Volume of NaOH (mL) x Concentration of NaOH (mol/L) x Molar mass of ascorbic acid (g/mol) x 1000 / 1

We must first determine the molar mass of ascorbic acid:

Molar mass of ascorbic acid = (6 x atomic mass of carbon) + (8 x atomic mass of hydrogen) + (6 x atomic mass of oxygen)

= (6 x 12.01) + (8 x 1.01) + (6 x 16.00)

= 176.12 g/mol

Now we can substitute the values ​​in the formula into:

Mass of ascorbic acid (mg) = 20.74 mL x 0.201 mol/L x 176.12 g/mol x 1000 / 1

= 739.1 mg

Therefore, the amount of ascorbic acid in the Vitamin C tablet is 739.1 mg.

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Your question is incomplete, most probably the complete question is:

A vitamin C (ascorbic acid) tablet was dissolved in approximately 50 mL of distilled water and titrated with the standardized NaOH solution. From the results of this titration, the mg of ascorbic acid in the tablet was calculated. Molecular formula of ascorbic acid: C6H8O6 Volume of NaOH required to neutralize ascorbic acid in Vitamin C tablet (mL) 20.74 Concentration of NaOH in mol/L, 0.201 Calculate the amount of ascorbic acid in the Vitamin C tablet in (mg).

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

In a longitudinal wave, the compression zone is where the particles are closest to one another. In a longitudinal wave, a rarefaction occurs where the particles are the furthest distant from one another.

Compression refers to the area where the medium is compressed, and rarefaction refers to the area where the medium is spread out.

Compression happens when molecules are forced, or pressed, together. Rarefaction is just the opposite, it occurs when molecules are given extra space and allowed to expand.

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Answer:

There are \(5.08\times 10^{22}\ \text{molecules of}\ C_6H_6\)  

Explanation:

In this problem, we need to find the number of molecules in \(8.437\times 10^{-2}\) mol of \(C_6H_6\).

The molar mass of \(C_6H_6\) is \(6\times 12+1\times 6=78\ g/mol\)

No of moles = mass/molar mass

We can find mass from above formula.

\(m=n\times M\\\\m=8.437\times 10^{-2}\ mol\times 78\ g/mol\\\\m=6.58\ g\)

Also,

No of moles = no of molecules/Avogadro number

\(N=n\times N_A\\\\N=8.437\times 10^{-2}\times 6.023\times 10^{23}\\\\N=5.08\times 10^{22}\ \text{molecules}\)

Hence, there are \(5.08\times 10^{22}\ \text{molecules of}\ C_6H_6\)  

Positive aspect of fossil fuels is They provide energy for cars, trains and heat.

1) They can be recycled and reused . this point is wrong because fossil fuels are non renewable resources and are in limits in supply . so, fossil fuels cannot be recycled.

2) They provide energy for cars, trains, and heat. This is statement is true.

3) They are ecologically friendly. this statement is wrong. The fossil fuels are not eco-friendly . they produce the pollution to the environment and severely damage our environment.

4) They do not need processing to produce energy.  they need geological process of millions years.

Thus, Positive aspect of fossil fuels is They provide energy for cars, trains and heat.

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Based on the information below . The atoms of the same element are Atom A and Atom C .

Atoms of same element have the same atomic number. so the number of protons and electron are same but they have different atomic masses called as Isotopes.  so, the atoms having different number of neutron will have different masses.

In the given case ,

Atom A               Atom B             Atom C

8 protons           10 protons        8 protons

8 neutrons         10 neutrons       10 neutrons

8 electrons         10 electrons      8 electrons

so, In Atom A  and Atom C , the number of protons and electrons are same but  the have different atomic masses means having different no. of neutrons. so Atom A and Atom C are the atoms of same elements.

Hence,Based on the information below . The atoms of the same element are Atom A and Atom C.

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Answer:

Color change, precipitation, bubbling

Explanation:

Chemical change changes the chemical composition and undergoes a process in which it results as a new substance.

The pOH of a solution can be calculated using the formula: pOH = -log[OH-]. To find the [OH-] concentration when the pOH is 7, we need to convert the pOH value to the OH- concentration.

Starting with pOH = 7, we can rearrange the equation to find [OH-]. Taking the antilog of both sides, we get 10^(-pOH) = 10^(-7). This simplifies to [OH-] = 10^(-7) or 0.0000001 M.

Therefore, the [OH-] concentration in the solution with a pOH of 7 is 0.0000001 M or 1 x 10^(-7) M.

It's worth noting that the pOH and pH of a solution are related by the equation: pH + pOH = 14. In this case, if the pOH is 7, the pH of the solution would be 14 - 7 = 7.

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7.6 moles of O2 will occupy 170.24 L at STP, and 0.58 moles of O2 will occupy 12.992 L at STP.

We can use the ideal gas law and the molar volume of a gas at STP.

The molar volume of a gas at STP is approximately 22.4 liters/mol.

(a) For 7.6 mol of O2:

Volume = Number of moles * Molar volume

Volume = 7.6 mol * 22.4 L/mol

Volume = 170.24 liters

Therefore, 7.6 moles of O2 occupy approximately 170.24 liters at STP.

(b) For 0.58 mol of O2:

Volume = Number of moles * Molar volume

Volume = 0.58 mol * 22.4 L/mol

Volume = 12.992 liters

Therefore, 0.58 moles of O2 occupy approximately 12.992 liters at STP.

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a) For 7.6 mol of O2 volume occupied at STP is approximately equal to 164.09 L

b) For 0.58 mol of O2 volume occupied at STP is approximately equal to 12.02 L

A temperature of 273.15 K (0 degrees Celsius) and a pressure of 1 atmosphere (atm) are defined as STP (Standard Temperature and Pressure).

We can use the ideal gas law equation to calculate the volume of a gas at STP:

PV = nRT

Where: P is the pressure (1 atm), V is the volume, n is the number of moles, R is the ideal gas constant (0.0821 L·atm/(mol·K)), and T is the temperature in Kelvin.

(a) In the case of 7.6 moles of O2, we can rearrange the equation to solve for the volume (V):

V = nRT / P

V = (7.6 mol) × (0.0821 L·atm/(mol·K)) × (273.15 K) / (1 atm)

On calculating,

V ≈ 164.09 L

(b) In the case of 0.58 moles of O2, we can rearrange the equation to solve for the volume (V):

V = nRT / P

V = (0.58 mol) × (0.0821 L·atm/(mol·K)) × (273.15 K) / (1 atm)

On Calculating,

V ≈ 12.02 L

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At 25 °C a solution having a pOH of 2.33. The [H₃O⁺] of the solution is 2.08 × 10⁻¹² M, and the solution is basic.

To find the [H₃O⁺] of the solution, we first need to use the relationship between pH and pOH;

pH + pOH = 14

Rearranging the equation, we get;

pH = 14 - pOH

Substituting the given value of pOH into equation, we have;

pH = 14 - 2.33 = 11.67

Next, we use the relationship between pH and [H₃O⁺];

pH = -log[H₃O⁺]

Substituting the value of pH we just calculated, we have;

11.67 = -log[H₃O⁺]

Taking the antilog of both sides, we get;

[H₃O⁺] = 2.08 × 10⁻¹² M

Therefore, the [H₃O⁺] is less than 1 × 10⁻⁷ M, the solution is basic.

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Answer:

*The molar volume of any gas at standard conditions of temperature and pressure is 22.4 L/mol

V= 101.3 L , n=? , Vm = 22.4 L/mol

101.3 = n × 22.4

n=101.3 / 22.4

n = 4.52 mol

I hope I helped you ^_^

Answer:

\(\boxed {\boxed {\sf 4.522 \ mol}}\)

Explanation:

We are asked to find how many moles of gas occupy a volume of 101.3 liters.

1 mole of any gas at STP (standard temperature and pressure) has a volume of 22.4 liters. We can use this information to make a proportion.

\(\frac {1 \ mol}{22.4 \ L}\)

We are converting 101.3 liters to moles, so we multiply the proportion by that value.

\(101.3 \ L *\frac {1 \ mol}{22.4 \ L}\)

The units of liters (L) cancel.

\(101.3 *\frac {1 \ mol}{22.4}\)

\(\frac {101.3}{22.4} \ mol\)

Divide.

\(4.52232143 \ mol\)

The original value of liters (101.3 L) has 4 significant figures, so our answer must have the same. For the number we calculated, that is the thousandths place. The 3 in the ten-thousandths place to the right tells us to leave the 2 in the thousandths place.

\(4.522 \ mol\)

101.3 liters of gas is equal to approximately 4.522 moles of gas.

The ideal gas law and stoichiometry must be used to calculate the volume of carbon dioxide gas produced by the breakdown of 4.09 g of calcium carbonate at STP (Standard Temperature and Pressure).

Use the molar mass of calcium carbonate (CaCO3) to determine how many moles it contains. CaCO3 has a molar mass of 100.09 g/mol.

CaCO3 mass divided by its molar mass equals the number of moles of CaCO3: 4.09 g/100.09 g/mol.

The number of moles of carbon dioxide (CO2) generated may be calculated using the stoichiometric ratio from the balancing equation. By using the equation:

A unit of CaCO3 and CO2 is produced.

CO2 moles equal the same number of moles of CaCO3.

Use the ideal gas law to translate the volume of carbon dioxide into moles.

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This is the reaction of respiration. Hence, the complete reaction is:

C₆H₁₂O₆ + O₂ → 6CO₂ + 6H₂O

Respiration is defined as a metabolic process wherein the living cells of an organism obtain energy (in the form of ATP) by taking in oxygen and releasing carbon dioxide from the oxidation of complex organic compounds. There are two forms of respiration: aerobic and anaerobic.

Aerobic respiration occurs in the presence of oxygen, while anaerobic respiration occurs in the absence of oxygen.

Because it generates the energy required for body function, respiration is significant. It gives the cells oxygen and releases harmful carbon dioxide. Hence, the reaction of cellular respiration is:

                           C₆H₁₂O₆ + O₂ → 6CO₂ + 6H₂O

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a) Calculate the density of the block.

The density of any substance is defined as the mass divided the volume.

Density of the block = mass of the block/volume of the block.

We are given the mass of the block.

mass of the block = 5.60 kg

Since the it is an iron cube, we can find its volume.

Side = 20 cm = 0.20 m

Volume of the block = (side)³

Volume of the block = (20 cm)³ = (0.20 m)³

Volume of the block = 8000 cm³ = 0.008 m³

Now that we know the mass and the volume we can find the density of the block.

Density of the block = Mass of the block / Volume of the block

Density of the block = 5.60 kg / 8000 cm³

Density of the block = 0.0007 kg/cm³

Density of the block = 5.60 kg / 0.008 m³

Density of the block = 700 kg/m³

Answer: The density of the block is 0.0007 kg/cm³ or 700 kg/m³

b) Calculate the mass of water displaced:

If we consider that the cube is completely submerged (as the problem says) it will displace some water. How much water does it displace? Archimedes' says: "The volume of displaced fluid is equivalent to the volume of an object fully immersed in a fluid". That means that the block completely submerged in water (fluid) will displace its volume of water.

volume of water displaced = volume of the block

volume of water displaced = 8000 cm³ = 0.008 m³

Now that we know the volume of water displaced, and since we are given the density of water, we can find the mass of water displaced.

Density of water = mass of water / volume of water

mass of water = volume of water * density of water

mass of water = 0.008 m³ * 1000 kg/m³

mass of water displaced = 8.0 kg

Answer: Supposing that the block is completely submerged it displaces 8.0 kg of water.

Formation of gas is an evidence that a chemical reaction has occurred.

The characteristics of chemical reaction are as follows:

1) Color change- The change in color of reactants when it is converted to products indicate that the reaction has taken place.

2)Evolution of gas-In some reactions , a gas is evolved indicating occurrence of chemical reaction.

3)Formation of precipitate- In some chemical reactions, an insoluble solid called as precipitate is obtained which is an indication that a chemical reaction has taken place.

4)Change in energy- In some cases of chemical reactions, there is a change in energy which is observed indicating occurrence of chemical reaction.

As the formation of gas is the characteristic of chemical reaction it serves as an indication  for occurrence of chemical reaction.

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Answer:

Substance D would be the correct answer.

Answer:

Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept

Answer:  The correct answer is;

Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.

Explanation:  This answer has been confirmed correct.

Answer:

802.2 K

Explanation:

To solve this problem we can use the formula:

Where Tb is the boiling point (in K).

We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:

Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹

So the boiling point of the compound is 802.2 K (or 529 °C)

The boiling point of the compound whose ΔHvap is 47.45 KJ is 802.2 K.

The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.

By the formula of colligative property

\(Tb = \dfrac{\Delta Hvap}{\Delta Svap }\)

Where Tb is the boiling point (in K).

ΔHvap is 47.45 kJ·mol⁻¹

ΔSvap is  J·mol−1·K⁻¹

Putting the values

\(Tb = \dfrac{47.45}{59.15 } =802.2 K.\)

Thus, the boiling point is 802.2 K or 529° C.

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Answer:

True

Explanation:

Methylcyclohexane has a cyclic compound of 7 carbons false classified as Saturated Hydrocarbon.

Answer:

a

Explanation:

If a desktop computer uses 180 W of power when plugged into a 120-V socket, 1.5 A of current is flowing into the device.

To calculate the current flowing into a desktop computer plugged into a 120-V outlet, we can use the formula:

Current (I) = Power (P) / Voltage (V)

here:

Current is measured in amperes (A)

Power is measured in watts (W)

Voltage is measured in volts (V)

So, for a desktop computer that uses 180 W and is plugged into a 120-V outlet, the current flowing into the computer would be:

I = P / V

= 180 W / 120 V

= 1.5 A

Therefore, the current flowing into the desktop computer is 1.5 amperes.

Note: It's important to ensure that the electrical outlet and the computer's power supply can handle the amount of current being drawn by the computer to avoid overloading the circuit and causing damage.

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