Which process occurs in an operating voltaic cell?(1) Electrical energy is converted to chemical energy.(2) Chemical energy is converted to electrical energy.(3) Oxidation takes place at the cathode.(4) Reduction takes place at the anode.

Answer: The mass percent by volume is 101.6%

Explanation:

The solution concentration expressed in percent by volume means that the amount of solute present in 100 parts volume of solution.

It is represented in formula as :

mass percent by volume =\(\frac{\text {mass of solute}\times 100}{\text {Volume of solution in ml}}\%\)

Given : mass of glucose = 330.1 g

volume of solution = 325 ml

Thus mass percent by volume =\(\frac{330.1g\times 100}{325ml}=101.6\%\)

Thus the mass percent by volume is 101.6%

If one knows the mass of A, they may calculate the mass of any other reactant and product in a chemical reaction.

Find out how many moles each reactant has. To identify which reactant is limiting, compare the mole ratios of the reactants with the ratio in the balanced chemical equation. Determine how many moles of the limiting reactant can be converted into the product.

Calculate the maximum number of moles of product that can be produced from the limiting reactant using mole ratios. Add the product's molar mass to the number of moles.

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Answer:

fe9ufeohdwbkdwsdjvdwihdwkbfw

Answer:

see below

Explanation:

The lake will have more total thermal energy but the particles in the coffee will be moving faster.

A comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

The principle of conservation of energy states that the total energy of an isolated system is always conserved.

Heat lost by the hot coffee = Heat absorbed by the cold lake

Heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

Thus, a comparison of hot coffee and cold lake is, the heat from the coffee will be absorbed by the cold lake through convection method of heat transfer.

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2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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Answer:

Explanation:

Answer:

The property P measured, was a chemical property of X; its acidity

The property D measured, was a physical property of X; its density

The property V measured, was a physical property of X; it's viscosity probably.

Explanation:

1. The property V that was measured is the acidity of X. The acidity of X is a measure of the concentration of hydrogen ions present in it. When drops of another solution, containing dissolved sodium hydroxide, are slowly added, and a pH indicator is used to determine when the sodium hydroxide has completely reacted with X, the procedure determines the concentration of X that would neutralize the base, sodium hydroxide.

2. The property of X determined in the step is the density of X, a physical property. First the volume of X was determined by the displacement method. Then the density of X is calculated from its mass and volume.

3. Since during the determination of the property V, there was no alteration done to the chemical constitution of X, the property thus determined is a physical property. Melting of the sample is a physical change and likewise its flow rate through a very thin tube.

Answer:

B not really sure tho :)

Explanation:

Answer:

An experiment designed to synthesize dibenzlacetone would have reagents added in the following order:

Explanation:

It is worth noting that the reaction is a type of mixed aldol condensation reaction, which uses sodium hydroxide as base.

I hope this is was a clear solution to the problem.

1 g/cm3 to kg/m3 = 1000 kg/m3

3.49 g/cm³= 3.49 x 1000

                 = 3490 kg/m³​

Ans: 3490 kg/m³​

Answer:

Removing energy (cooling) atoms and molecules decreases their motion, resulting in a decrease in temperature

Answer:

The answer is D

Explanation:

because insecticides are used for insects but pesticides are used to kill off unwanted plants

Answer:

B. herbicides

Explanation:

it kills weeds.

Given the empirical formula, the molecular formula that has a mass of 214.8g is C₁₀H₁₅O₅

From the question, we are to determine the molecular formula

From

Molecular formula = (Empirical formula)n

Where

\(n = \frac{Molecular\ formula\ mass}{Empirical\ formula\ mass}\)

From the given information,

Empirical formula is C₂H₃O

Therefore, Empirical formula mass = (12×2) + (1×3) + (16)

Empirical formula mass = 24 + 3 + 16

Empirical formula mass = 40 g

Then,

\(n = \frac{214.8}{40}\)

n = 5.37

n ≅ 5

Therefore,

Molecular formula = (C₂H₃O)₅

Molecular formula = C₁₀H₁₅O₅

Hence, given the empirical formula, the molecular formula that has a mass of 214.8g is C₁₀H₁₅O₅

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Divide the weight with 1,000 times the component or material's density to the conversion from grammes to litres. Sulfur hexafluoride in litres is produced from 11.0g of sulphur hexafluoride gas. 0.0753138778434317.

What volume of water is equivalent to one kilogramme. When pure water attains a maximum density of one kg/l at a temperature around 39.2 °F or 4 °C, it has a volume of 1 litre. 1 kilogramme of water is somewhat more than 1 litre at higher temperatures.

As there is one mole of SF in every six moles, there are now 0274 moles in total. After solving, we get the result of.164 mole of fluorine. Adding 1 mole will also have 6 moles od fluorine, giving us 0.0274 moles in s f, 6, corresponding to 6 times in 0.0274 mole of chlorine. Hence, in 4 grammes.

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The change in enthalpy when 3 moles of methane react in excess oxygen is -2.67 × 10³ kJ (Option B).

Enthalpy (H) is a thermodynamic property that describes the total heat content of a system at a constant pressure. It is a measure of the energy that is transferred as heat during a chemical reaction or physical change at constant pressure.

Enthalpy is defined mathematically as:

H = U + PV

where U is the internal energy of the system, P is the pressure, and V is the volume. Enthalpy is often measured in units of Joules (J) or kilojoules (kJ).

The given reaction is:

CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l) ΔH = -890 kJ

This equation shows that when one mole of methane reacts with two moles of oxygen, it produces one mole of carbon dioxide and two moles of water while releasing 890 kJ of energy.

To determine the change in enthalpy when 3 moles of methane react in excess oxygen, we need to first calculate the amount of heat released when one mole of methane reacts with excess oxygen.

From the balanced chemical equation, we can see that 1 mole of CH4 releases 890 kJ of energy, so the energy released by 3 moles of CH4 would be 3 times that value:

Energy released by 3 moles of CH4 = 3 × (-890 kJ/mol) = -2670 kJ

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The change in enthalpy when 3 moles of methane react in excess oxygen is -2670 kJ.

What is Enthalpy?

Enthalpy is a thermodynamic property of a system that describes the heat content of the system at constant pressure. It is denoted by the symbol "H" and is expressed in units of joules (J) or kilojoules (kJ). Enthalpy is a state function, which means that it depends only on the initial and final states of the system, not on the path taken to reach those states.

The given reaction is: CH4 (g) + 2O2 (g) → CO2 (g) + 2H2O (l), ΔH = −890 kJ

This reaction is for one mole of methane. To find the change in enthalpy when 3 moles of methane react, we need to multiply the enthalpy change by 3:

ΔH = 3 × (-890 kJ/mol) = -2670 kJ

Therefore, the change in enthalpy when 3 moles of methane react in excess oxygen is -2670 kJ.

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Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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Answer:

428,715

Explanation:

World figures say that around 428,000 people died of pollution in 2007.

Answer: it blue

Explanation:

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

13 minutes

Explanation:

For the endothermic reaction to reach 0°C, it will take 13 minutes.

 Let us follow the process step by step;

 Rate of decrease is 2°C per minute.

  Start is 26°C

    Time                   temperature

     0 min                    26°C

      1 min                     24°C

      2 min                     22°C

     3 min                      20°C

    4 min                       18°C

   5 min                        16°C

     6 min                      14°C

     7 min                      12°C

     8 min                     10°C

    9 min                       8°C

     10 min                      6°C

     11 min                       4°C

     12 min                      2°C

      13 min                      0°C

The equilibrium constant (Kc) for the given reaction is approximately 16.448. The value of Kc indicates the relative concentrations of reactants and products at equilibrium. In this case, a Kc greater than 1 suggests that the products (H2 and P4) are favored at equilibrium, indicating that the forward reaction is more favorable.

To determine the equilibrium constant (Kc) for the given reaction:

4PH3(g) ↔ 6H2(g) + P4(g)

We can write the equilibrium constant expression based on the stoichiometric coefficients:

Kc = ([H2]^6 * [P4]) / ([PH3]^4)

Substituting the given equilibrium concentrations:

[PH3] = 0.250 M

[H2] = 0.580 M

[P4] = 0.750 M

We can plug in these values into the equilibrium constant expression:

Kc = ([0.580]^6 * [0.750]) / ([0.250]^4)

Kc = (0.0860128 * 0.750) / (0.00390625)

Kc = 16.448

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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The elements which can form anions among the following is O, S and Se.

What are anions?

Anions are the negatively charged ions which are formed by the balanced atoms when they gain one or more electrons to become negatively charged. The examples for anions include, Cl-, F-, O2-, SO4- etc. Usually the anions are formed by the non metals when they gain electrons.

The non metals like O, Se and S have a tendency to form anions because they are just 2 electrons away from completing the octet in the configuration. So, they easily accept 2 electrons to fill the octet and become stable forming anions with other atoms.

Therefore, the elements like O, S and Se form anions faster than the other elements in the following.

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So when something is boiling it is moving faster meaning the molecules are more spread out and not condense like a solid

So the answer is the 2nd set

By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.

In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.

Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.

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Answer:

sodium chloride can be used as salt

extraction sodium metal by electrolysis

a common chemical in laboratory experiments

Answer:

sodium chloride can be used as preservatives,

in preserving foods.

In first reaction alkyne is treated with base to remove proton later alkyne anion react with T20 to form tritium isotope labelled product.

What is reagent?

Reagent is a substance used to bring about a chemical reaction, or added to test if a reaction occurs. In a chemical reaction, one or more reactants are combined to form one or more products. A reagent is typically used to start, speed up, or determine the progress of a reaction. Common reagents include acids, bases, oxidizers, reducing agents, and salts. Reagents can also be used in qualitative or quantitative analysis to detect, measure, or separate chemicals in a sample.

For structure refer attached file
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After being treated with a base in the initial reaction to remove the proton, the alkyne anion then reacts with T20 to produce a product labeled with the tritium isotope.

A reagent in a chemical process is what?

In the field of chemical research, a "substance or compound that is given to a system in order to bring about a chemical reaction or is added to check whether a reaction is occurring or not" is referred to as a reagent. A similar response is utilized to validate the discovery of the presence of another drug.

A catalyst can speed up a certain chemical reaction, whereas a reagent is a material or mixture used in chemical analysis or other reactions.

See attached file for response.

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The question is confusing, but if you are saying that the heat of vaporization is 393 joules per gram, and 30 grams condense, then the answer is simply 30 * 393 = 11790 joules.

Answer:

The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining

Explanation:

Answer:

The monosaccharides, amino acids, bile salts, vitamins, and other nutrients are absorbed by the cells of the intestinal lining.

Explanation: