which one of the following species is the strongest reducing agent at 25°c? a. li (aq) b. br2 (ℓ) c. fe2 (aq) d. cl−(aq) e. ni (s)

Answer:

No

Explanation:

In the hot pack, as the water reacts with the magnesium sulfate, the pack becomes bigger is not an indication that new atoms have been created or produced.

As with all chemical reactions, they all obey the law of conservation of matter which states that "in chemical reactions, matter is neither created nor destroyed but atoms simply recombine".

The reason why the hotpack becomes bigger is because the atoms gain more volume.

The general properties of matter result from its relationship with mass and space. ... Because it occupies space, all matter has volume and impenetrability, since two objects cannot occupy the same space simultaneously.

Non-combustible

eg:-glass,water,stone, Portland cement etc ...

Answer:

Noncombustible

Explanation:

So

Some examples are ,glass ,stone

The coefficient for sodium in the balanced equation would be 1.

When balancing a chemical equation, you want to make sure that the number of atoms of each element is the same on both sides of the equation. To do this, you can follow these steps:

          Na + Cl2 -> NaCl

     On the left side, there is 1 Na and 2 Cl.

      On the right side, there is 1 Na and 1 Cl.

        Na + Cl2 -> 2 NaCl

Thus, the coefficient of sodium is 1.

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Answer:

0.231 mol HCl

Explanation:

What we know:

Here M stands for molarity. Molarity is the number of moles of the substance present per Litre of solution. So in place of M we can write moles / L

Number of moles of HCl solution = Volume of HCl solution x Strength of HCl solution

= 0.70 L x 0.33 moles / L

= 0.231 mol HCl

0.231 moles of HCl are present in 0.70 L of a 0.33 M HCl solution

The elements are the present in this mixture is the A and D. The correct option is 1.

The bright line spectrum that is produced by the four elements with the are in the below picture. The bright line spectrum is the spectrum when created is when the beam of the light passes through the sample that is analyte sample that is some of the wavelengths of the light that are absorbed through the atoms with the sample. Thus, the electrons in the atoms will get to the excited state.

Therefore, the bright line spectrum of the mixture formed by the two elements are A and the D. The option 1 is correct.

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a) Transfer function:The pH neutralization process can be represented as a second-order system. The system transfer function can be obtained from the process reaction as shown below, 1/(τ1s+1)(τ2s+1).

Hence, the transfer function is given as: G(s) = 4/(2s+1)(3s+1)The desired closed-loop transfer function:Let’s assume that C(s) is the controller’s transfer function that takes the error and produces the control signal. And, G(s) is the process transfer function. The closed-loop transfer function is given by:T(s) = C(s)G(s)/[1+C(s)G(s)]The desired transfer function must be in a first-order system.

Now, substituting these values in T(s), we get the following equation: 1/(Tas+1) = Kp(1+Tis)4(Tas+1)(2s+1)(3s+1)Hence, we get the following values:Kp = 3.014Ti = 4.96sNominal feedback control may not achieve the design requirementThe nominal feedback control may not achieve the design requirement because the closed-loop transfer function cannot be made first-order with a time constant of 2 min.

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Answer:

comes from a translation of the German word Edelgas, which means noble gas.

Why Are Noble Gases Called Noble? The term “noble gas” comes from a translation of the German word Edelgas, which means noble gas. German chemist Hugo Erdmann coined the phrase in 1898. Like a nobleman might consider it undignified to associate with commoners, noble gases tend not to react with other elements.

Explanation:

hope it helps

Answer:

D. decreased biodiversity

Explanation:

Habitat loss due to the increasing human

population has caused decreased biodiversity

To determine the percent yield of a chemical reaction, we need to compare the actual yield of the reaction to the theoretical yield. The information given in the question is not sufficient to calculate the percent yield. Therefore, the answer is d. The percent yield cannot be determined without knowing the actual yield of the reaction.

The percent yield of a chemical reaction is the ratio of the actual yield to the theoretical yield, expressed as a percentage. The actual yield is the amount of product obtained from the reaction, while the theoretical yield is the maximum amount of product that can be obtained, based on the stoichiometry of the reaction and assuming complete conversion of the reactants. The equation given in the question is a balanced chemical equation, which tells us the stoichiometry of the reaction, but it does not provide information about the amounts of reactants and products used or obtained. Without knowing the actual yield of the reaction, we cannot calculate the percent yield. Therefore, the answer is d. The percent yield cannot be determined without knowing the actual yield of the reaction.

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C. Without a protective coat, the seed is vulnerable to digestion by animals that consume the fruit.

If a seed grows inside a fruit and lacks a protective coat, it is likely to be digested by animals that consume the fruit. The absence of a protective coat makes the seed more vulnerable to the digestive enzymes present in the digestive systems of animals. As the animal ingests the fruit, the seed may undergo mechanical and chemical processes within the digestive tract, ultimately leading to its breakdown and nutrient absorption by the animal. This process can facilitate seed dispersal, as the animal may excrete the indigestible seed in a different location, contributing to the seed's potential for germination and establishment in a new environment.

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The molarity of the solution will be 1.00 M.

We use the following formula to determine a molarity of the solution;

Molarity (M) = moles of solute/volume of solution in liters

First, we need to calculate the number of moles of  H₃PO₄ present in 98.0 g of the compound;

moles of  H₃PO₄ = mass of H₃PO₄/molar mass of  H₃PO₄

The molar mass of H₃PO₄ is;

1 x (atomic mass of H) + 3 x (atomic mass of O) + 4 x (atomic mass of P)

= 1 x 1.008 + 3 x 15.999 + 4 x 30.974

= 98.0 g/mol

moles of  H₃PO₄ = 98.0 g / 98.0 g/mol = 1.00 mol

Now we can calculate the molarity;

Molarity = 1.00 mol / 1.00 L

= 1.00 M

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9. melting point

10. balloons float because they are filled with hydrogen, a gas which is less dense than air.

11. specific gravity

12. element

13. mixture

14. sodium and chlorine

15. cutting of paper

16. condensation

17. 1 and 3

18. heat energy is released

Answer:

I don't see a question.

Explanation:

I do see a reaction in which tells us that the C2H4 has a double-bonded C.  The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.

H2C=CH2 + H2 → H3C-CH3

Answer: this might have something to do with the pancreas

Explanation:

the pancreas produces insulin if subject a produces more insulin than subject b the reaction to the glucose will be different the pancreas breaks down the glucose into sugar and protiens hope this helps

Answer:

Earth

Strongest

Moon

Gravitational

Tide

Pulls

Bulge

Waves

Proximity

Low Tide

Answer:

NH3 + 02 > NO + H2O

Explanation:

Answer:

Its valancy is 1.

As it has the formula OH-.

It has valancy 1.

hope it helps..

Answer:

15.68 Joules

Explanation:

In physics, work is defined as the energy that is transferred to or from an object by a force that displaces that object some distance.  The SI unit for work is a Joule, which itself is defined as 1 kg*m^2/s^2.

The attached file explains the steps to cacluate work done in raising the 2 kg book 0.8m.

Chemical systems in nature tend to undergo changes towards Option B lower energy and higher entropy.

Entropy, the measure of a system's thermal energy per unit temperature that is unavailable for doing useful work.

Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.

In terms of energy and entropy, systems in nature tend to undergo changes toward lower energy and higher entropy.

Entropy is important as it describes the flow and distribution of energy.

For a process to to occur spontaneously, it is a necessary condition that the entropy of the system undergoing the process to increase.

If the entropy decreases, then that process cannot occur spontaneously.

It needs some work/ energy to be pumped in in order for the process to occur.

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2-hexanone is more reactive than 3-hexanone.

The reactivity of a ketone can be influenced by the position of the carbonyl group relative to the alkyl substituents. In the case of 2-hexanone and 3-hexanone, the position of the carbonyl group differs.

2-hexanone has the carbonyl group located on the second carbon of the hexane chain, whereas 3-hexanone has the carbonyl group on the third carbon. The reactivity of ketones typically increases as the carbonyl group is closer to the end of the alkyl chain.

In this case, 2-hexanone has a more reactive carbonyl group than 3-hexanone because it is closer to the end of the carbon chain. The proximity to the end of the chain allows for greater accessibility and interaction with nucleophiles during reactions.

The increased reactivity of 2-hexanone can be attributed to the greater electronic and steric effects experienced by the carbonyl group, which make it more susceptible to nucleophilic attack or other chemical transformations compared to 3-hexanone.

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The mole fraction of each gas must be used in order to calculate the partial pressure of each gas in the combination.

We must first determine how many moles of each gas there are in the mixture:

First, we need to calculate the moles of each gas in the mixture:

moles of Kr = 10.7 g / 83.80 g/mol = 0.1278 mol

moles of CO2 = 15.1 g / 44.01 g/mol = 0.3433 mol

The total moles of the mixture is:

total moles = 0.1278 mol + 0.3433 mol = 0.4711 mol

Now we can calculate the mole fraction of each gas:

mole fraction of Kr = 0.1278 mol / 0.4711 mol = 0.2711

mole fraction of CO2 = 0.3433 mol / 0.4711 mol = 0.7289

The partial pressure of each gas can be calculated using the mole fraction and the total pressure:

partial pressure of Kr = mole fraction of Kr x total pressure

= 0.2711 x 965 mmHg

= 261.9 mmHg

partial pressure of CO2 = mole fraction of CO2 x total pressure

= 0.7289 x 965 mmHg

= 703.1 mmHg

Therefore, the partial pressure of krypton in the mixture is 261.9 mmHg and the partial pressure of carbon dioxide is 703.1 mmHg.

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The given reaction is already balanced, that is to say tha the number of atoms in the reactants matches the number of atoms in the products. In the reaction, we can see the relationship between CaC2 and H2O. For each mole of CaC2 two moles of H2O react.

So, if 4.8 moles of CaC2 are consumed the moles of H2O needed will be:

Mol of H2O = Mol of CaC2 x 2

Mol of H2O = 4.8 x 2 = 9.6 mol of H2O

Now, to calculate the grams of H2O we will use the following equation and the mass molar of H2O.

Mass molar of H2O =18.01 g/mol

So, if 4.8 moles of CaC2 are consumed in this reaction, 172.9 g of H2O are needed

Answer: 6, 7 and 6 significant figures, respectively.

Explanation:

A.  67.20 x  8.02 = 538.944, has  6 significant figures  .

B. 486.02 x 0.056 = 27.21712, has 7 significant figures .

C. 11.264 + 245.3 =  256.564 = 6 significant figures.

C. The theoretical yield of aspirin is found to be 4.2g

The largest amount of product that could be generated from the provided reactant amounts is termed as the theoretical yield. The quantity of product that actually formed during the reaction in a laboratory environment is known as the actual yield.

C₇H₆O₃ + C₄H₆O₃→ C₉H₈O₄ ( aspirin)

No of moles of  salicylic acid => 3.2/138.122 => 0.023 mol

no of moles of acetic anhydride => 1.08 g/mL x 6.3 mL / 102.089 g/mol

                                                        => 0.066mol

salicylic acid is limiting reagent

Theoretical yield calculated:

1 mole of salicylic acid=> 1 mole of aspirin

      Hence,  0.023  mol of aspirin formed in this reaction.

Theorectical yield of aspirin =>  0.023 mol x 180g/mol => 4.2g

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