using a curling iron to curl your hair is
conduction
convection
radiation

The molar mass in grams of "one mole" of each substance is:

Fe: 55.845 g/mol

\(Cl_2\): 70.906 g/mol

\(FeCl_3\): 162.204 g/mol

To calculate the molar mass in grams of "one mole" of each substance, we need to determine the atomic masses of the elements involved in the equation.

The atomic mass of iron (Fe) is 55.845 g/mol.

For chlorine (\(Cl_2\)), we need to consider that the molar mass of \(Cl_2\) is twice the atomic mass of chlorine because the formula shows that two chlorine atoms combine to form one molecule of \(Cl_2\). The atomic mass of chlorine is 35.453 g/mol, so the molar mass of \(Cl_2\) is 2 * 35.453 g/mol = 70.906 g/mol.

The formula for iron(III) chloride (\(FeCl_3\)) indicates that one mole of \(FeCl_3\)contains one mole of iron and three moles of chlorine. Therefore, we can calculate the molar mass of \(FeCl_3\)by summing the atomic masses of iron and chlorine:

Molar mass of \(FeCl_3\)= (1 * atomic mass of Fe) + (3 * atomic mass of Cl)

Substituting the values, we have:

Molar mass of \(FeCl_3\) = (1 * 55.845 g/mol) + (3 * 35.453 g/mol)

= 55.845 g/mol + 106.359 g/mol

= 162.204 g/mol

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The number of the grains of rice that we have from the question here is  16214 grains

In this case, we know that we have to rely on the information that we have in the question so as to be able to obtain the mass of the rice that we need in this case and that is what we are going to set out to do in this question.

We know that;

Mass of the Rice = 786 grams - 332 grams

= 454 g

If 1000 grains of rice have a mass of 28 g

x grains of rice have a mass of 454 g

x = 1000 * 454/28

x = 16214 grains

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The molarity of the Ca(NO3)2 solution would be 0.005 M

First, let us look at the balanced equation of the reaction:

\(2HNO_3+Ca(OH)_2 ---> Ca(NO_3)_2+2H_2O\)

The mole ratio of HNO3 to Ca(OH)2 is 2:1.

Mole of HNO3 = molarity x volume

                            = 0.2 x 150/1000

                              = 0.03 mole

Mole of Ca(OH)2 = 0.01 x 150/1000

                             = 0.0015

Thus, there is no limiting or excess reactant.

Also from the equation, mole ratio of Ca(OH)2 to Ca(NO3)2 is 1:1. Hence, the mole of Ca(NO3)2 would also be 0.0015 mole.

The total volume of the resulting solution would be: 150 +150 = 300 mL

Thus, the molarity of the resulting Ca(NO3)2 would be:

Molarity = mole/volume

              = 0.0015/0.3

               = 0.005 M

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The correct answer is element

Answer:

yes

Explanation:

Answer:

yes

Explanation:

let's say you have ice, you put it on a pan then it heats up you get a liquid after a while it turns into a gas

The solubility of the salts is affected by the temperature changes. 1. NaCl is least affected by temperature. 2. supersaturated. 3. 60 grams KBr. 4. Ethanol has both polar and non-polar groups. 5. Mixing and shaking.

A KBr solution with 90 gm solute in 100 grams of water at 50 degrees is classified as supersaturated. 60 grams of KBr are needed to make a saturated solution in 100 gm of water at 30 degrees.

Ethanol is a general solvent due to the presence of both the polar and the non-Polar groups. As a result, it is easier to dissolve both polar molecules and non-Polar molecules. The dissolving rate can be increased by mixing or shaking the solution. Also, the sugar dissolves faster in hot than cold tea.

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The amount of heat energy (in KJ) needed to convert 3 moles of water vapor into hydrogen gas and oxygen gas is 1450.8 KJ

We'll begin by writing the balanced equation. This is illustrated below:

2H₂ + O₂ --> 2H₂O ΔH = 483.6 KJ

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

The heat energy needed to convert 3 moles of water can be obtained as illustrated below:

From the balanced equation above,

2 moles of water (H₂O) required 483.6 KJ to produce hydrogen gas and oxygen gas

Therefore,

3 moles of water (H₂O) will require = 3 × 483.6 = 1450.8 KJ to produce hydrogen gas and oxygen gas

Thus, we can conclude that the energy needed to convert 3 moles of water is 1450.8 KJ

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Answer:

(a). The solubility of \(BaCO_{3}\) in pure water is \(4.4\times10^{-5}\ M\)

(b). The solubility of \(BaCO_{3}\) in solution is \(6.92\times10^{-9}\ M\)

Explanation:

Given that,

(a). The solubility of \(BaCO_{3}\) in pure water

(b). The solubility of \(BaCO_{3}\) in a solution

Solubility of \(CO_{3}^{-2}\) is 0.289 M

We know that,

The solubility product constant  of  \(BaCO_{3}\) is \(2\times10^{-9}\)

Let the solubility of \(BaCO_{3}\) is s.

We need to calculate the solubility of \(BaCO_{3}\) in pure water

Using formula of solubility

\(ksp=s\times s\)

\(ksp=s^2\)

\(s=\sqrt{ksp}\)

Put the value into the formula

\(s=\sqrt{2\times10^{-9}}\)

\(s=4.4\times10^{-5}\ M\)

(b). We need to calculate the solubility of \(BaCO_{3}\) in solution

Using formula of solubility

\(ksp=s\times s\)

Put the value into the formula

\(2\times10^{-9}=s\times 0.289\)

\(s=\dfrac{2\times10^{-9}}{0.289}\)

\(s=6.92\times10^{-9}\ M\)

Hence, (a). The solubility of \(BaCO_{3}\) in pure water is \(4.4\times10^{-5}\ M\)

(b). The solubility of \(BaCO_{3}\) in solution is \(6.92\times10^{-9}\ M\)

The electronegativity of SO\(_4\) is more than electronegativity of H\(_2\)SO\(_4\). The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity.

When an atom of a certain chemical element forms a chemical connection, it has a propensity to draw shared electrons (called electron density), which is represented by the symbol.

The atomic number and the separation of the valence electrons from the charged nucleus have an impact on an atom's electronegativity. The electronegativity of SO\(_4\) is more than electronegativity of H\(_2\)SO\(_4\).

Therefore,  the electronegativity of SO\(_4\) is more than electronegativity of H\(_2\)SO\(_4\).

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Answer:

Magnesium oxide is an ionic compound that can be used as a building material. MO2 is actually a raw material that used in producing cement for building houses, buildings, and other constructions.

Explanation:

The system which helps in get rid of some kind of waste are excretory system, digestive system and respiratory system.

Waste materials are the substances which we will get after the absorption of all nutients and usefull things.

Hence all above given systems helps to get rid of some kind of waste.

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Answer:

The first image = double replacement

Second = single replacement

Third = Decomposition

Fourth = Combination

Explanation:

1. a color from each pair is being swapped and replacing each other so there is a double replacement

2. only the blue and the red are changing places so it is single replacement

3. the pair is being separated (decomposed)

4. the red and green are coming together (combined)

Answer:

roh = 1.6x\(10^{-3}\)

Explanation:

The density (g/mL) of a rectangular bar that has a mass of 186.77 g and measures 4.26 cm in length, 1.42 cm in width, and 19.21 cm in height is 1.61g/mL.

The density of a substance can be calculated by dividing the mass of the substance by its volume.

According to this question, a rectangular bar measures 4.26 cm in length, 1.42 cm in width, and 19.21 cm in height.

Volume of rectangular bar = Length × width × height

= 4.26 × 1.42 × 19.21

= 116.21cm³

Density of the bar = 186.77g ÷ 116.21mL

Density of the bar = 1.61g/mL

Therefore, the density (g/mL) of a rectangular bar that has a mass of 186.77 g and measures 4.26 cm in length, 1.42 cm in width, and 19.21 cm in height is 1.61g/mL.

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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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Without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes.

The pH value of a solution can potentially change before and after the operation of a cell, depending on the specific reaction occurring in the cell and the nature of the electrodes involved.

However, without additional information about the specific cell and its components, it is difficult to provide a definitive answer. The pH of a solution is influenced by the concentration of hydrogen ions (H+) in the solution, which can be affected by various chemical reactions, including oxidation and reduction reactions occurring in the cell.

During the operation of a cell, the electrodes undergo chemical reactions, and ions from the electrolyte may participate in these reactions. These reactions can influence the concentration of hydrogen ions and potentially alter the pH of the solution. The direction of the pH change depends on the specific reactions occurring at the electrodes.

For example, in an electrolytic cell, the flow of electric current causes non-spontaneous redox reactions to occur. These reactions might involve the generation or consumption of hydrogen ions, which can affect the pH of the solution.

In a galvanic cell or battery, spontaneous redox reactions take place, and the pH changes can be more complex. The electrode materials, their potential, and the specific reaction kinetics can influence the pH changes in the solution.

Therefore, without further details on the specific cell and its components, it is not possible to provide a definitive answer regarding the pH change before and after the cell operates for 20 minutes. The pH change would depend on the specific reactions occurring in the cell and the behavior of the electrodes involved.

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The original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

The correct transformation function that reflects a shift of 4 units to the left and 3 units down is g(x) = f(x+4) - 3.

This is because, in function notation, adding to the input value inside the function (x+4) shifts the function to the left, while subtracting from the output of the function (-3) shifts it down.

So, the original function f(x) = 1/x becomes g(x) = 1/(x+4) - 3 after the transformation.

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Two key criteria that engineers must prioritize are efficiency and safety. By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

When developing a process, engineers need to consider several important criteria. Two key criteria that engineers must prioritize are efficiency and safety.

Efficiency is crucial in process development to ensure optimal use of resources, time, and energy. Engineers strive to design processes that maximize productivity, minimize waste, and reduce costs. This involves optimizing reaction conditions, streamlining workflow, and implementing automation where possible. Efficiency considerations also extend to energy consumption, raw material utilization, and overall process sustainability.

Safety is another critical aspect that engineers must prioritize. They need to identify and mitigate potential hazards associated with the process, ensuring the safety of both personnel and the environment. This involves conducting thorough risk assessments, implementing safety protocols, and designing equipment and systems with safety features. Engineers must also consider the safe handling and storage of materials, as well as potential risks during transportation and disposal.

By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.

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Explanation:

The boiling point of propanoic acid is higher than that of 1-butanol due to the prevalence of hydrogen bonding in propanoic acid.

Answer:

lunar eclipses have a nice day

Answer:

independent- test variable

manipulated - outcome variable; if needed, there could be changes.

Explanation:

knowledge

Answer:

17 protons, 20 neutrons, and 17 electrons​.

Explanation:

A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.

Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.

Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).

The mass number of this neutral atom of Cl-37 is 37 and we know that the atomic number (number of protons) of chlorine is 17. Also, the atomic number of an element is equal to the number of its electrons.

A neutral atom of Cl-37 has 17 protons, 20 neutrons, and 17 electrons.

Hence, a neutral atom of Cl-37 can be identified based on its number of protons because it represent its atomic number, which is what is used to differentiate an atom of an element from the atom of another chemical element.

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

The speed of the molecules in the lake will decrease due to decrease in the kinetic energy.

Kinetic energy is the energy due to the motion of particles.

Kinetic energy increases with increase in temperature.

Since the temperature of the lake decreases ad it freezes, the kinetic energy decrease and the speed of the molecules in the lake will decrease.

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A dehydration reaction is a chemical reaction that removes water molecules from a compound. The general equation for a dehydration reaction is:

A-H + B-OH → A-B + H₂O

In this equation, A and B represent different parts of the compound, and the -H and -OH groups are removed to form water.

To calculate the molar mass of water, we need to add the atomic masses of hydrogen and oxygen:

Molar mass of water = (2 x atomic mass of H) + atomic mass of O
Molar mass of water = (2 x 1.008) + 16.00
Molar mass of water = 18.016 g/mol

The molar mass of the anhydrate (the compound without water) will depend on the specific compound you are working with. You can find the molar mass of the anhydrate by adding up the atomic masses of each element in the compound.

To find the mass percent of water in the hydrate, you can use the following equation:

Mass percent water = (mass of water in hydrate / mass of hydrate) x 100%

You will need to know the mass of the hydrate and the mass of water in the hydrate to calculate the mass percent of water.

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Answer:

Br₂(l) + ΔV → Br₂(g)

Explanation:

When a chemical or phase change occurs during a chemical process some heat is absorbed or released. For the process of vaporization of a substance, the heat (Usually required) is ΔV (How many energy is required for the process occurs).

In the vaporization of Br2 there are required 7.4kcal/mol, Δv. The reaction is:

Answer:

By heating the mixture to maximum boiling point and then the solution is distilled at a constant temperature without having a change in composition.

Explanation:

An azeotropic mixture is also called a constant boiling mixture and it is a mixture of two or more liquids whose proportions cannot be altered by simple distillation due to the fact that when an azeotropic mixture is boiled, the vapor has the same proportions of constituents as the unboiled mixture.

Now, maximum boiling azeotropic mixture are the solutions with negative deviations that have an intermediate composition  for which the vapor pressure of the solution is minimum and as a result, the boiling point is maximum. At that point, the solution will distill at a constant temperature without having a change in composition.