HELP ASAP PLEASE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The value of ΔH for the reaction CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g) is -1272 kJ.

To calculate the enthalpy change (ΔH) for the given reaction, we can use Hess's law, which states that the overall enthalpy change of a reaction is equal to the sum of the enthalpy changes of the individual reactions involved.

Given the enthalpy changes:

1. 2 C(s) + O₂(g) → 2 CO(g)... ∆H = -222 kJ

2. C(s) + O₂(g) → CO₂(g)... ∆H = -394 kJ

3. 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

We need to manipulate these reactions to obtain the desired reaction:

1. Reverse reaction 2: CO₂(g) → C(s) + O₂(g)... ∆H = +394 kJ

2. Multiply reaction 2 by 2 to balance carbon atoms: 2 CO₂(g) → 2 C(s) + 2 O₂(g)... ∆H = -788 kJ

3. Leave reaction 3 unchanged: 2 H₂(g) + O₂(g) → 2 H₂O(g)... ∆H = -484 kJ

By adding reactions 2 and 3, we obtain the desired reaction:

CO(g) + H₂(g) + O₂(g) → CO₂(g) + H₂O(g)... ∆H = -788 kJ + (-484 kJ) = -1272 kJ

Therefore, the value of ΔH for the given reaction is -1272 kJ.

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Answer:

B. kilogram

Explanation:

The basic SI unit of mass is the kilogram.

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The accumulate lead sulfate and then convert it back into usable components helps to ensure that the battery can provide a reliable source of power over a long period of time.

In an automotive lead-acid battery, the negative plate is typically made of lead, although it may also contain small amounts of other elements such as tin, antimony, and calcium. The lead is usually in the form of a sponge-like structure that allows for a larger surface area, which helps to increase the battery's capacity.

During the charging process, lead sulfate forms on both the negative and positive plates. However, the negative plate tends to accumulate more lead sulfate than the positive plate. This is because the negative plate has a higher affinity for sulfate ions.

When the battery is charged, the lead sulfate on the negative plate is converted back into lead and sulfuric acid, which are the components needed to produce electricity. This process is known as the discharge cycle, and it is the opposite of the charging cycle.

Overall, the negative plate plays an important role in the operation of an automotive lead-acid battery.

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In a saturated solution of calcium phosphate with a solubility of 2.21 x 10^{-4} g/L, the molar concentration of the calcium ion (Ca^{+2}) is approximately 7.13 x \(10^{-7}\) M, and the molar concentration of the phosphate ion (PO_{4}^{-3}) is approximately 3.38 x 10^{-7} M.

To determine the molar concentrations of the calcium ion and the phosphate ion in the saturated solution of calcium phosphate, we need to use the given solubility and the molecular weight of calcium phosphate.

The solubility of calcium phosphate is given as 2.21 x10^{-4} g/L. We can convert this to moles per liter by dividing by the molar mass of calcium phosphate (310.18 g/mol):

2.21 x 10^{-4}g/L / 310.18 g/mol = 7.12 x 10^{-7} mol/L

Since calcium phosphate has a 1:1 ratio of calcium ions (\(Ca^{+2}\)) to phosphate ions (PO43-), the molar concentrations of both ions in the saturated solution will be the same. Therefore, the molar concentration of the calcium ion and the phosphate ion is approximately 7.13 x 10^{-7}M.

In conclusion, in a saturated solution of calcium phosphate with a solubility of 2.21 x 1\(10^{-4}\) g/L, the molar concentration of the calcium ion (Ca^{+2}) and the phosphate ion (\(PO_{4}^{-3}\)) is approximately 7.13 x10^{-7} M.

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Water is a polar substance. Polar solvents dissolve polar substances. Now, the bond between carbon and hydrogen is a covalent bond, because the electronegativity difference between these two elements is less than 1.7.

Therefore, the low solubility of hexane is due to the fact that hexane is nonpolar with covalent bonds.

Answer: C) Nonpolar covalent

Answer:

i hope this helped

They have no true nucleus as the DNA is not contained within a membrane or separated from the rest of the cell, but is coiled up in a region of the cytoplasm called the nucleoid. Prokaryotic organisms have varying cell shapes.

Explanation:

Answer:

Explanation:

The DNA in prokaryotes is contained in a central area of the cell called the nucleoid, which is not surrounded by a nuclear membrane. Many prokaryotes also carry small, circular DNA molecules called plasmids, which are distinct from the chromosomal DNA and can provide genetic advantages in specific environments.

Therefore, the volume of the gas at 4.00oc and 108.7kpa is 583 ml.

To solve this problem, we need to use the combined gas law, which relates the volume, pressure, and temperature of a gas. The formula for the combined gas law is:
(P1 x V1) / (T1) = (P2 x V2) / (T2)
Where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.
We can plug in the given values into the formula and solve for V2:
(P1 x V1) / (T1) = (P2 x V2) / (T2)
(65.3 kpa x 654 ml) / (6.00oc + 273.15) = (108.7 kpa x V2) / (4.00oc + 273.15)
Simplifying the equation, we get:
V2 = (65.3 kpa x 654 ml x (4.00oc + 273.15)) / (6.00oc + 273.15) / (108.7 kpa)
V2 = 583 ml

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Answer:

In a solid the attraction between particles are strong enough to hold all the particles together and are able t vibrate about in fixed positions. In liquids, the particles can slip past one another and tumble around.

Explanation:

During beat decay

D. A neutron decays into a proton and an electron occurs during beta decay.

Beta decay is a type of radioactive decay that occurs when an unstable atomic nucleus emits an electron (called a beta particle) and a type of neutrino called an antineutrino.

During beta decay, a neutron within the nucleus of an atom decays into a proton, an electron, and an antineutrino. The proton stays in the nucleus, increasing the atomic number by one, while the electron and antineutrino are emitted from the nucleus. The emitted electron is often referred to as a beta particle, hence the name beta decay

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Answer:

D

Explanation:

It states that D has oxygen, and is closer to the Sun.

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Answer:

I am pretty sure it is B

Explanation:

The others would either burn u like a crispy chicken nugget or freeze you like a popsicle

Answer:

the rate is faster, and the time of reaction is 28 seconds

Explanation:

i did the test

Answer:

The rate is faster, 28 seconds

Explanation:

Answer:

49.54%

Explanation:

Given parameters:

Number of organisms in original habitat = 4695

Number of organism in new habitat = 2326

Solution:

To find the percentage of the organisms in the new habitat that has migrated to the new habitat, we use the expression below:

% of the population in the new habitat =  x 100

% of the population in the new habitat =  x 100 = 49.54%

Based on the given table, we can use the initial concentration of A and B to determine the rate constant for the reaction. The rate law for the given reaction can be expressed as Rate = k[A]^1[B]^3, where k is the rate constant and [A] and [B] are the concentrations of A and B, respectively.


The table provides us with the initial concentrations of A and B and their corresponding rates at different time intervals. Using this information, we can determine the rate constant of the given reaction. We can assume any set of initial concentrations of A and B and calculate the corresponding rate of the reaction using the given rate law.

Let's assume that [A]₀ = 0.1 M and [B]₀ = 0.2 M. We can then use the given data in the table to calculate the initial rate of the reaction. From the table, we can see that when [A]₀ = 0.1 M and [B]₀ = 0.2 M, the initial rate of the reaction (Rate₀) is 0.015 M/min.

Using the equation derived above, we can calculate the rate constant (k) for this reaction. Substituting the values we obtained, we get:

k = 0.015/([0.1]^1[0.2]^3) = 18.75 M^-3 min^-1

Thus, the value of the rate constant for the given reaction is 18.75 M^-3 min^-1.


The rate constant of a reaction can be determined using the initial concentrations of the reactants and their corresponding rates at different time intervals. The rate law for the reaction can be used to derive an equation that relates the rate constant to the initial concentrations and rates of the reaction. By assuming any set of initial concentrations and calculating the corresponding rate of the reaction, we can determine the value of the rate constant using the derived equation. In the given example, the value of the rate constant for the reaction A(g) + 3 B(g) → C(g) + 2 D(g) is 18.75 M^-3 min^-1.

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Answer:

20W

Explanation:

the power of qn object doing work w in a given time t is given by

p= w/t

Student 2 explains why the water only condensed on the top part of the test tube using sound scientific reasoning. The process through which a gas transforms into a liquid is called condensation. Therefore, choice B is right.

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When alkaline hydrolysis was first invented, people were hired for various roles related to the process and implementation of this technology. Some of the jobs that emerged include Chemical engineers, Technicians and operators, Waste management specialists, Scientists and researchers.

Chemical engineers: These professionals played a crucial role in developing and optimizing the alkaline hydrolysis process. They were responsible for designing the equipment, developing the necessary chemical reactions, and ensuring the efficient operation of the system.

Technicians and operators: Skilled technicians and operators were hired to operate and maintain the alkaline hydrolysis equipment. They were trained to monitor the process parameters, handle the chemicals involved, and ensure the proper functioning of the system.

Waste management specialists: With the introduction of alkaline hydrolysis as a method for disposal of organic waste, specialized professionals in waste management were employed to oversee the proper handling and treatment of the waste materials. They were responsible for implementing safety protocols, managing waste streams, and complying with environmental regulations.

Scientists and researchers: Alkaline hydrolysis required scientific expertise for continuous improvement and innovation. Scientists and researchers were hired to study the process, analyze the results, and explore potential applications in various fields such as biofuel production and chemical synthesis.

Overall, the introduction of alkaline hydrolysis created employment opportunities for professionals in engineering, chemistry, waste management, and research, among others, as this technology gained recognition and adoption.

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Answer: See Below

Explanation:

H2O has two hydrogen atoms and one oxygen atom. It is a polar molecule

CO2 has one carbon molecule and two oxygen molecules. Both CO2 and H2O have two polar bonds. However the dipoles in the linear CO2 molecule cancel each other out, meaning that the CO2 molecule is non-polar.

Aluminum and iron oxide (Fe₂O₃) react together to produce aluminum oxide, 20 g of Fe₂O3 will produce 14 g of Fe.

Oxide is a category of chemical compound that has one or more oxygen atoms and also another element in its composition.

2Al +  Fe₂O₃ -> Al₂O₃ + 2Fe

Molar mass of Fe₂O₃ is: (2 x 56) + (3 x 16) = 160 g/mol

moles of Fe2O3 = 20 g / 160 g/mol = 0.125 mol

As the reaction is carried out with an excess of Al, we can assume that all of the Fe₂O₃ is consumed and that 2 moles of Fe are produced for every mole of Fe₂O₃

moles of Fe = 2 x moles of Fe₂O₃ = 0.25 mol

Molar mass of Fe is : 56 g/mol

So the mass of Fe produced is:

mass of Fe = moles of Fe x molar mass of Fe

mass of Fe = 0.25 mol x 56 g/mol = 14 g

Therefore, 20 g of Fe₂O₃ will produce 14 g of Fe.

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Answer:The overall ionic formula for a compound must be electrically neutral, meaning it has no charge. When writing the formula for the ionic compound, the cation comes first, followed by the anion, both with numeric subscripts to indicate the number of atoms of each.

Explanation:

In the ammonia production process given by the reaction 3H₂(g) + N₂(g) → 2NH₃(g), when 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because 7.5 moles of hydrogen would be needed to consume the available nitrogen (option 1).

The reaction is the following:

3H₂(g) + N₂(g) → 2NH₃(g)   (1)

To know why hydrogen is considered the limiting reactant, we need to calculate the number of moles of nitrogen and hydrogen with the following equation:

\( n = \frac{m}{M} \)

Where:    

m: is the mass

M: is the molar mass

\( n_{H_{2}} = \frac{m}{M} = \frac{7.00 g}{2.016 g/mol} = 3.47 \:moles \)

\( n_{N_{2}} = \frac{m}{M} = \frac{70.0 g}{28.013 g/mol} = 2.50 \:moles \)

We can see in reaction (1) that 3 moles of hydrogen react with 1 mol of nitrogen, so the number of hydrogen moles needed to react nitrogen is:

\( n_{H_{2}} = \frac{3\:moles\:H_{2}}{1\:moles\:N_{2}}*n_{N_{2}} = \frac{3\:moles\:H_{2}}{1\:moles\:N_{2}}*2.50 \:moles = 7.50 \:moles \)

Since we have 3.47 moles of hydrogen and we need 7.50 moles to react with all the mass of nitrogen, the limiting reactant is hydrogen.

We can find the number of ammonia moles produced with the limiting reactant (hydrogen) konwing that 3 moles of hydrogen produces 2 moles of ammonia, so:

\( n_{NH_{3}} = \frac{2\:moles\:NH_{3}}{3\:moles\:H_{2}}*n_{H_{2}} = \frac{2\:moles\:NH_{3}}{3\:moles\:H_{2}}*3.47 \:moles = 2.31 \:moles \)

Hence, hydrogen would produce 2.31 moles of ammonia.

Therefore, hydrogen is the limiting reactant because 7.5 moles of hydrogen would be needed to consume the available nitrogen (option 1).

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Answer:

Bi (Bismuth)

Ag (Silver)

Li (Lithium)

Explanation:

Xe (Xenon) and I (Iodine) are non-metals. They cannot from a metallic bond because metallic bonds are bonds between metals only.

Answer:

B

Explanation:

Molarity measures the strength of a solution. Remember, a solution is made up of two parts: the solvent (which does the dissolving) and the solute (the substance that is dissolved). The more solute there is, the higher the concentrate and therefore the higher the molarity of the solution. Thus B is the answer

Answer:

Increase

Less/low number

Lessen

Explanation:

Increase > Increase in temperature cause increase in volume.

Less/low number > As volume increases the number of particles to be adjusted in the same space will be lesser than before.

Lessen> At constant pressure as increase in temperature cause increase in volume so the density will lessen due to increase in volume. Density equation is given below.

Density = mass /volume

If volume increases density will get lowered.

Answer: 25 + 27 + 29 = 81

81 divided by 3 = 27

your answer is 27

Explanation: you add them all together then however many numbers there are is how you divide it

Answer:

81 and 27 i think

Explanation:

The percent yield of 5 grams of C₃H₈, and was able to produce 7.11 grams of H₂O is 87.4%.

To find the percent yield of a reaction, the actual yield is divided by the theoretical yield and multiplied by 100%.  we must know the balanced equation for the reaction that can be written as:

C₃H₈ + 5O₂ → 4H₂O + 3CO₂

First, we need to determine the theoretical yield of H₂O. From the balanced equation, we know that the mole ratio of C₃H₈ to H₂O is 1:4. That is, for every mole of C₃H₈ consumed, 4 moles of H₂O are produced.

Using the molar mass of C₃H₈, we can calculate the number of moles of C₃H₈ consumed:

5 grams C₃H₈ × 1 mol C₃H₈ ÷ 44.1 grams C₃H₈

= 0.113 mol C₃H₈

Since the mole ratio of C₃H₈ to H₂O is 1:4, the number of moles of H₂O produced can be calculated by multiplying the number of moles of C₃H₈ by 4:

0.113 mol C₃H₈ × 4 = 0.452 mol H₂O

Using the molar mass of H₂O, we can convert this to grams:

0.452 mol H₂O × 18.02 grams H₂O/mol H₂O = 8.14 grams H₂O

This is the theoretical yield of H₂O.

To calculate the percent yield, we divide the actual yield (7.11 grams) by the theoretical yield (8.14 grams) and multiply by 100%:

Percent yield = Actual yield ÷ Theoretical yield × 100%

= 7.11 grams ÷ 8.14 grams × 100%

= 87.4%

Therefore, the percent yield of the reaction is 87.4%.

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Answer:

False

Explanation:

Just because their hair is their doesn't mean they where their during that time period or their at all. It could have been brought in by someone else's clothes.

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We can determine the culprits by extracting the fingerprints and DNAs from the hair strand taken from the crime location. But if suspected one's hair is not found from the scene does not indicated that he or she was not involved in the crime. Hence, the statement is false.

Forensic laboratories tests samples from crime scenes. There are various advanced testing methods which helps to identify the culprits of a crime. For example the hair and fingerprints, clothes or any chemical materials, blood etc. obtained from the crime scene are tested to identify its owner.

Hair is made of proteins. From each hair strand we can extract a number of DNA molecules. Thus a hair strand obtained from a crime scene can be tested and can identify its owner.

However, sometimes there will be no evidences such as hair or blood in the crime location or sometime the may some samples which are not related the culprits.

Hence, it cannot be said that if there is no hair or any sample related with the suspected one from the crime scene, that they could be exonerated. Thus the statement is falls and he/she can be a culprit which can be proved in another way.

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It would require approximately 19,008 joules of energy to heat a frozen can of juice (360 grams) from -5 °C to 110 °C.

We need to use the specific heat capacity formula:

Q = mcΔT

Where

First, we need to convert the mass of the can of juice from grams to kilograms:

m = 360 g = 0.360 kg

Next, we need to find the specific heat capacity of the juice. The specific heat capacity varies depending on the type of juice, but for the purposes of this calculation, we can assume a value of around 4200 J/kg°C, which is the specific heat capacity of water.

c = 4200 J/kg°C

Finally, we can calculate the energy required to heat the can of juice:

Q = mcΔT

Q = (0.360 kg)(4200 J/kg°C)(110°C - (-5°C))

Q = (0.360 kg)(4200 J/kg°C)(115°C)

Q = 19,008 J

Therefore, it would require approximately 19,008 joules of energy to heat a frozen can of juice (360 grams) from -5 °C to 110 °C.

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Answer:

Experiments with gases that first became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom based on the following assumptions. 1. Matter is made up of atoms that are indivisible and indestructible.

The above reaction is a Single displacement reaction , in which lead (Pb) being more reactive displaces Copper (Cu) from its compound \((\mathrm{CuCl_2})\) and forms Lead Chloride \((\mathrm{PbCl_2})\).

\( \boxed{\mathrm{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}}\)

_____________________________

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The application of heat or acid to a protein that causes its shape to change is known as denaturation.

Denaturation is a process that alters the structure of a protein, leading to the disruption of its function. Proteins are complex molecules made up of long chains of amino acids that fold into intricate shapes, which are crucial for their biological activity.

The shape of a protein is determined by its amino acid sequence, as well as the environment in which it exists. External factors such as temperature and pH can affect the shape of a protein, leading to denaturation.

Denaturation can occur in a variety of ways, including exposure to high temperatures, extremes of pH, or certain chemicals. When a protein is denatured, its shape is disrupted, causing it to lose its biological activity. For example, the denaturation of enzymes can lead to their loss of function, resulting in a range of health problems.

Denaturation is an important process in many biological and industrial applications. In food processing, denaturation of proteins can be used to create desirable textures and flavors. In medicine, denaturation can be used to destroy disease-causing proteins. Understanding the process of denaturation is crucial for scientists and engineers in developing new therapies and products.

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