in the laboratory you are asked to make a 0.149 m iron(iii) chloride solution using 475 grams of water. how many grams of iron(iii) chloride should you add?

To calculate the amount of charge required to reduce 0.44 mol of Ca2+ ions to calcium metal, we need to use Faraday's laws of electrolysis. According to Faraday's laws, the amount of charge (Q) passing through an electrolytic cell is directly proportional to the moles of substance being reduced or oxidized.

The equation that relates the charge (Q), moles (n), and Faraday's constant (F) is Q = n * F.

Given that we have 0.44 mol of Ca2+ ions, we can calculate the charge as follows:

Q = 0.44 mol * F

Now, the value of Faraday's constant (F) is 96,485 C/mol.

Q = 0.44 mol * 96,485 C/mol

Calculating the value, we find:

Q ≈ 42,429 C

Therefore, the amount of charge required is approximately 42,429 C.

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Answer: 8.5x10^4

Explanation: The equation you should look for is Q= nzF

(.44)(2)(96500)  = 84920 then youll wound it up to 8.5x10^4 c

Answer:

Standard pressure is always 1.00atm. Example #1: How many moles of oxygen will occupy a volume of 2.50 L at STP? Standard temperature = 273K law.

Explanation:

Answer:

2.07 atm

Explanation:

Answer: Volcanoes and volcanic activity are responsible for the unusual ecosystems in the highlands.

hope this helps have a awesome day❤️✨

Explanation:

They are neutrally charged

They typically do not conduct electricity in solid state

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The first step is to write the combustion reaction of hexane:

Now, we can use Avogadro's Number to find the amount of moles of hexane and O2 that are reacting:

Using the stated reaction we can determine the amount of moles of O2 that react with 0.43 moles of hexane:

From this we can conclude that the limiting reactant is the O2, which means that we have to use the amount of O2 to make the calculations. Use this amount and the stoichiometric ratio of O2 and H2O to find the amount of water produced from 1.16moles of oxygen:

Now, we can use Avogadro's number to convert the amount of moles produced to molecules:

It means that 5.12x10^23 molecules of water are produced.

It is important to note that this reaction is specific to the hydrolysis of tannins with Na2CO3.

This equation describes the hydrolysis of one ester group in tannins by Na2CO3. Tannins are a type of polyphenol found in plant tissues, and they contain ester groups that can be hydrolyzed by alkalis such as Na2CO3. In this reaction, the ester group in tannins (C22H18O10) is cleaved by Na2CO3, producing two molecules of benzoic acid (C7H6O2) and two molecules of gallic acid (C9H8O4), along with carbon dioxide (CO2) and water (H2O).

The reaction can be written as:

C22H18O10 + Na2CO3 → 2C7H6O2 + 2C9H8O4 + CO2 + H2O

This equation shows that one molecule of tannin reacts with one molecule of Na2CO3, and produces four molecules of products. The reaction is an example of hydrolysis, which is a chemical reaction that involves the breaking of a chemical bond using water.

It is important to note that this reaction is specific to the hydrolysis of tannins with Na2CO3. Different esters and different alkalis may produce different products.

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A single replacement reaction is one in which one element is replaced by another. The reaction in the balanced equation is Zn(s) + H2SO4(aq) ZnSO4(aq) + H2 (g).

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A single displacement reaction is one in which one element is replaced by another. The reaction in the balanced equation is Zn(s) + H2SO4(aq) ZnSO4(aq) + H2 (g). So, choice B is the right one.

When an element from a compound is replaced by another element from the reactant to create a product, the reaction is referred to as a single displacement reaction.

The replacement or substitution is determined by the activity series or reactivity. The weaker and less powerful element will be replaced by the one with greater strength.

The equation for the balanced single-displacement reaction is

H2SO4(aq) + Zn(s) ZnSO4(aq) + H2 (g)

Here, zinc replaces hydrogen because it is more reactive than hydrogen and creates zinc sulphate as a result.

The balanced equation is therefore option B: Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g).

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Answer:

Hydrosphere

Explanation:

Hydro meaning water

The molecular orbitals for B₂, C₂, and N₂ are arranged in increasing energy levels. The highest energy orbital is a π* orbital, followed by a σ* orbital, and then a π orbital.

The molecular orbitals of B₂, C₂, and N₂ can be determined using molecular orbital theory.

In general, the molecular orbitals are arranged in order of increasing energy, starting from the lowest energy level, also known as the ground state, to the highest energy level, which is the excited state.

For B₂, the molecular orbitals are arranged in the following order: σ₁s, σ₁s, σ₂s, σ₂s, π₂p, σ₂p, and π₂p.

The highest energy orbital is π₂p, followed by σ₂p, and π₂p. The σ₂s and σ₁s orbitals are lower in energy than the π₂p, but higher in energy than the σ₂p orbital.

For C₂, the molecular orbitals are arranged in the following order: σ₁s, σ₁s, σ₂s, σ₂s, π₂p, π₂p, σ₂p, and σ₂p.

The highest energy orbital is σ₂p, followed by π₂p, and σ₂p. The π₂p orbital is lower in energy than the σ₂p orbital, but higher in energy than the σ*₂p orbital.

For N₂, the molecular orbitals are arranged in the following order: σ₁s, σ₁s, σ₂s, σ₂s, π₂p, σ₂p, π₂p, and σ₂p.

The highest energy orbital is σ₂p, followed by π₂p, and σ₂p. The π₂p orbital is lower in energy than the σ₂p orbital, but higher in energy than the σ*₂p orbital.

Overall, the trend in energy levels is similar for all three molecules, with the highest energy orbital being a π* orbital, followed by a σ* orbital, and then a π orbital.

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The volume of CO₂ generated under condition of STP in the reaction :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂ is  12.5 mL.

The reaction is given as :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂
mass of CaCO₃  = 750 mg = 0.75 g

molarity of HCl = 0.100 M

volume of HCl = 25 mL = 0.025 L

moles of CaCO₃  = 0.75 / 100

                            = 0.0075 mol

moles of HCl = 0.100 × 0.025

                       = 0.0025 mol

here HCl is limiting reagent , formation of CO₂ depends on HCl

2 moles of HCl = 1 mole of CO₂

0.0025 mol of HCl = 0.0025 / 2

                               = 0.00125 mol

volume of CO₂ = moles / molarity

                          = 0.00125 / 0.100

                         = 0.0125 L = 12.5 mL

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Answer:

this is answer brother

Answer:

0.7073569530323789

Explanation:

They prob want it rounded tho so 0.71

Answer:

C. The molecules move slower

Explanation:

Explanation:

sweet,sour,salty, savoury

Answer: bitter

Explanation:

Answer:

hearing aid

Explanation:

an artificial body part

A hearing aid is an example of a prosthesis. Therefore, option A is correct.

A prosthesis is an artificial device or replacement for a missing body part or function. In the case of a hearing aid, it is a device designed to assist people with hearing loss by amplifying sound. It acts as a substitute for the natural function of the ear.

A textbook is a written educational resource, gloves are protective coverings for the hands, and a pair of boots is footwear. These items do not serve as artificial replacements for missing body parts or functions.

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Answer:

?

Explanation:

What are the statements? You've given the passage but not the statements

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Hydrogen sometimes is missing an electron and sometimes it has an extra electron.

Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.

Because it has no neutrons in its nucleus, hydrogen (particularly hydrogen -1) is unusual. There is only one proton in the nucleus of hydrogen. The only element without neutrons is this one. Although it has a single electron orbiting its nucleus as well, hydrogen typically contributes this electron to form a single, positively charged proton instead.

Thus, Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

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Answer:

O titanium, Ti

Explanation:

Homa is using the impression formation process to evaluate her new coworker based on his lack of eye contact, mumbling, and perceived insincerity.

What is impression formation process?

The impression formation process refers to how individuals form opinions and judgments about others based on various cues and information available to them.

In this case, Homa is using her observations of her new coworker's behavior, such as the lack of eye contact, mumbling, and perceived insincerity, to form an impression of him. These behaviors are considered nonverbal cues that can influence how we perceive others.

Homa's negative impression may be influenced by her interpretation of these cues, associating them with traits like untrustworthiness or lack of confidence. It is important to note that impression formation is subjective and can be influenced by individual biases and personal experiences.

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Answer:

A gas occupies a volume of 250 mL at a pressure of 76 kPa and a temperature of 298 K.

Explanation:

Charles's law states that for a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. This mathematical law expresses that the quotient that exists between the volume and the temperature will always have the same value:

\(\frac{V}{T} =k\)

Gay-Lussac's law says that when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases. This law mathematically says that the quotient between pressure and temperature is constant:

\(\frac{P}{T} =k\)

Finally, Boyle's law says that the volume occupied by a certain gaseous mass at constant temperature is inversely proportional to the pressure. This law is expressed mathematically as

P * V = k

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\(\frac{P*V}{T} =k\)

Analyzing an initial state 1 and a final state 2, it is satisfied:

\(\frac{P1*V1}{T1} =\frac{P2*V2}{T2}\)

In this case:

Replacing:

\(\frac{38 kPa*500 mL}{298 K} =\frac{76 kPa*250 mL}{T2}\)

Solving:

\(T2*\frac{38 kPa*500 mL}{298 K} =76 kPa*250 mL\)

\(T2=\frac{76 kPa*250 mL*298 K}{38 kPa*500 mL}\)

T2= 298 K

A gas occupies a volume of 250 mL at a pressure of 76 kPa and a temperature of 298 K.

Answer:

[Cl-18]⁻ & [Cl-20]⁻

Explanation:

By definition isotopes are elements with the same number of protons by different number of neutrons. Elements X-18 & X-20 have 17 protons and represent Chlorine isotopes Cl-18 & Cl-20 each with 17 protons and 18 electrons to give the isotopes a -1 oxidation state. Both isotope of chlorine have 7 electron in its valence shell and 10 electrons in its core structure.  Gaining 1 electron fills the valence octet and establishes a -1 oxidation state.

Answer:

The energy found in the reactants remains in the system, and the reactants also take energy from the surroundings.

Explanation:

In an endothermic reaction,the energy found in the reactants remains in the system, and the reactants also take energy from the surroundings. The enthalpy change of an endothermic reaction is positive.

The reaction in which  heat energy is absorbed by the reactants is called an endothermic reaction. The enthalpy change in an endothermic reaction is positive.

The reaction in which heat is evolved from the system to the  surroundings is called an exothermic reaction in which the enthalpy change is negative.

By absorbing heat energy, reactants becomes energetic enough to overcome the barrier potential of the reaction. Therefore, the potential energy diagram of an endothermic reaction will show less energy for reactants than that of products.

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Answer:

Atomic mass: 22.989769 u

Explanation:

The statement that correct are a, c and d, which are saying, "Ionic bonds are generally formed when a metal bonds with a non-metal"; "Na+ and Cl- share electrons to form a stable compound. and Na loses an electron to form the cation Na'.

The chemical bond that is formed when the complete sharing of electrons take place, is called a Ionic bond.

Generally, metals loses and electron and non-metals tend to gain an electron. This is why Ionic bonds are usually formed between metals and non-metals.

The ionic bonds are formed when sharing of electron takes place not only by the attraction.

Na⁺ and Cl⁻ shares electrons to form bonds, this statement is true.

Also, the statement saying that Na⁺ cation is formed by the losing of one electron by Sodium. It is true.

Because sodium is a metal, it loses an electron and chlorine is a non-metal, it gains an electron so that they both can form a bond between the, share there electrons and form a stable compound.

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The changes are classified as follows:

1: Chemical change -  The addition of the water to quicklime

2: Physical change - The melting of candle wax

3: Physical change -  The change in colour of zinc oxide from white to yellow and vice versa during heating and after cooling, respectively

4: Physical change- The dissolution of common salt

5: Chemical change - The hardening of cement by the absorption of carbon (Iv) oxide​

1: The addition of water to quicklime (slaking of lime) is a chemical change. It involves a chemical reaction between calcium oxide (quicklime) and water to form calcium hydroxide (slaked lime). This reaction is exothermic and produces heat.

2: The melting of candle wax is a physical change. It involves a phase transition from a solid state to a liquid state due to the application of heat. The chemical composition of the wax remains unchanged during this process.

3: The change in color of zinc oxide from white to yellow and vice versa during heating and cooling is a physical change. It is a reversible process caused by the alteration of the crystal structure of zinc oxide. The change in color is due to the absorption or release of energy during the heating and cooling processes, respectively.

4: The dissolution of common salt (sodium chloride) is a physical change. It involves the separation of ionic bonds between sodium and chloride ions in the solid salt and their subsequent dispersal in water. The chemical composition of the salt remains the same; it simply forms a homogeneous mixture with water.

5: The hardening of cement by the absorption of carbon dioxide (CO2) is a chemical change. It involves a chemical reaction known as carbonation, where carbon dioxide reacts with the calcium hydroxide in cement to form calcium carbonate. This reaction leads to the formation of new chemical compounds and a change in the structure and properties of the cement, resulting in its hardening or curing process.

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The potential energy diagram for the reaction N02(0) -> JN2(9) + 02(9) should be a curve that descends from reactants to intermediates and then ascends to products, with a label indicating that ΔH = -33.1 kJ/mol.

A potential energy diagram of a reaction is a graph that demonstrates the progress of a reaction and the changes in potential energy that occur over time. The vertical axis of the diagram shows potential energy, and the horizontal axis shows reaction progress. Reactants are shown on the left, intermediates are shown in the middle, and products are shown on the right. The reaction pathway is depicted with a curve that descends from reactants to intermediates and then ascends to products. Labeling the enthalpy of a reaction involves identifying its enthalpy change. The enthalpy change (ΔH) of a reaction is the heat absorbed or given off by the system at a constant pressure. The reaction N02(0) -> JN2(9) + 02(9) has ΔH = -33.1 kJ/mol. The reaction is exothermic because the enthalpy change is negative.

The potential energy diagram for this reaction should be a curve that descends from reactants to intermediates and then ascends to products. The enthalpy change should be labelled in the diagram. If the enthalpy change is negative, then it should be labelled as a negative value. If the enthalpy change is positive, then it should be labelled as a positive value.

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The chemist should observe the formation of solid copper metal, a change in color of the solution, and the disappearance of the aluminium foil through this unbalanced equation.

The balanced equation for the reaction between copper (II) chloride and aluminum is:

3CuCl2 + 2Al → 2AlCl3 + 3Cu

In this reaction, aluminum replaces copper in the copper chloride solution to form aluminium chloride and copper metal.

The likely observations when the reaction stops are:

1. The solution may change color, indicating that a chemical reaction has occurred. Copper (II) chloride is blue, while aluminum chloride is colorless.

2. Solid copper metal may form and settle at the bottom of the container, indicating that a precipitation reaction has occurred.

3. The aluminum foil may appear to have dissolved or disintegrated, as it has been consumed in the reaction.

4. The reaction mixture may become warmer due to the exothermic nature of the reaction.

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