What happens if metal is in acid?
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If 100 g of liquid ammonia evaporates, then 33.23 kJ heat was removed.

Given in the question that ΔH = 5.65 kJ/mol

No. of moles = Mass / Molar mass

No. of moles = 100 / 17 = 5.88

1 mole of ammonia evolves 5.65 kJ

So, 5.88 moles of ammonia evolves 33.23 kJ.

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. Such energy transfer can occur in three ways: radiation, conduction, and convection.

The Sun is the biggest source of heat energy in our solar system. It radiates heat, which reaches Earth in the form of radiation.

Measurement of heat is done in calories. One calorie is the amount of energy required to raise one gram of water one degree Celsius. To measure heat, you divide the change in temperature of a sample of water by the mass of the water.

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Na+ will become smaller when compared to the Na atom since the cations of a specific element have smaller radii than the neutral atom.

So because 3s1 electron has indeed been removed to create a closed circle with n = 2, the Na+ ion is considerably smaller than that of the neutral Na atom.

Since the outer electrons, which are located the farthest from of the nucleus, are lost, cations were smaller than that of the comparable neutral atoms.The diameter of the ion is further lowered as more electrons are removed from the cation.

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Answer:

Faraday’s – First Law of Electrolysis

It is one of the primary laws of electrolysis. It states, during electrolysis, the amount of chemical reaction which occurs at any electrode under the influence of electrical energy is proportional to the quantity of electricity passed through the electrolyte.

Faraday’s – Second Law of Electrolysis

Faraday’s second law of electrolysis states that if the same amount of electricity is passed through different electrolytes, the masses of ions deposited at the electrodes are directly proportional to their chemical equivalents.

From these laws of electrolysis, we can deduce that the amount of electricity needed for oxidation-reduction depends on the stoichiometry of the electrode reaction.

The product of an electrolytic reaction depends on the nature of the material being electrolysed and the type of electrodes used. In the case of an inert electrode such as platinum or gold, the electrode does not participate in the chemical reaction and acts only as a source or sink for electrons. While, in the case of a reactive electrode, the electrode participates in the reaction.

Hence, different products are obtained for electrolysis in the case of reactive and inert electrodes. Oxidizing and reducing species present in the electrolytic cell and their standard electrode potential too, affect the products of electrolysis.

FAQs

1. What’s a Faraday?

Ans: The Faraday is an electric charge volume unit without measurements, equal to approximately 6.02 x 10 23 electric charge carriers.

2. Why is Faraday’s law important?

A shifting magnetic flux creates an electric field, according to Faraday’s law. Faraday’s law is particularly important since it addresses the connection of the E-field and the B-field and understands that this connection necessitates flux fluctuation over time.

3. How does electrolysis remove rust?

Ans: Electrolysis is a method of removing iron oxide by passing a small electrical charge through the rusty metal from a battery or battery charger to induce ion exchange while the device is submerged in an electrolyte solution.

4. What happens to water during electrolysis?

Ans: Water’s Electrolysis. By passing an electrical current through it, water can be decomposed. When this happens, an oxidation-reduction reaction is caused by the electrons from the electric current.

5. What is the negative electrode called in electrolysis?

Ans: Through electrolysis, the negatively charged electrode is called the cathode. The positively charged electrode is called the anode in electrolysis. Negatively charged ions are moving towards the anode.

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Answer:

Faraday's law states that the absolute value or magnitude of the circulation of the electric field E around a closed loop is equal to the rate of change of the magnetic flux through the area enclosed by the loop.

Explanation:

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Answer:

c

Explanation:

the rest are chemical properties

Answer:

Joule

Explanation:

This is the answer

12.4 moles of ammonia (NH₃) can be made from 6.2 moles of nitrogen (N₂).

A mole is defined as the amount of a substance which contains 6.022 × 10²³ atoms, molecules or ions. In a chemical reaction, the total number of moles in reactant side is equal to the total number of moles in product side.

Ammonia is formed as a product in the reaction between hydrogen gas and nitrogen gas.

The balanced equation for the reaction between hydrogen (H₂) and nitrogen (N₂) gas to form ammonia(NH₃) is given as:

N₂ + 3H₂ → 2NH₃

From the given reaction, we can see that 1 mole of N₂ gives  2 moles of NH₃.

So, from 6.2 moles of N₂ , we will get

=2 × 6.2 moles

=12.4 moles

Thus, 12.4 moles of ammonia (NH₃) can be made from 6.2 moles of nitrogen(N₂).

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1) Groups of elements in the periodic table.

Metals are located in the middle and left side of the periodic table.

The second picture has correctly shaded the metals.

.

We would counsel Elijah to thoroughly understand the problem, identify alternatives, evaluate options, make an informed decision, and implement and monitor the chosen solution, while emphasizing effective communication and collaboration throughout the process.

As a consulting team for Elijah, we would provide the following counsel:

Understand the Problem: We would advise Elijah to thoroughly understand the problem or challenge he is facing. This involves gathering all the relevant information, clarifying any ambiguities, and defining the objectives clearly. Elijah should assess the root cause of the problem and identify any underlying issues.

Identify Alternatives: We would encourage Elijah to generate a range of potential solutions or strategies. This could involve brainstorming sessions and seeking input from relevant stakeholders. Elijah should consider both conventional and innovative approaches to address the problem.

Evaluate Options: We would help Elijah analyze and evaluate each alternative based on predetermined criteria and objectives. This includes assessing the feasibility, risks, costs, and benefits associated with each option. Elijah should consider the short-term and long-term implications of each alternative.

Make a Decision: We would support Elijah in making an informed decision by weighing the pros and cons of each option. Elijah should consider the potential outcomes and their alignment with his goals and values. We would encourage him to seek input from key stakeholders and consider their perspectives.

Implement and Monitor: We would advise Elijah to develop an action plan for implementing the chosen solution. This involves assigning responsibilities, setting timelines, and monitoring progress. Regular review and evaluation of the implemented solution will help identify any necessary adjustments or improvements.

Throughout the process, effective communication, collaboration, and adaptability are crucial elements for Elijah to successfully navigate the problem-solving process and achieve his desired outcomes.

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Answer:

See explanation

Explanation:

There are two main factors that affect the magnitude of thermal energy of a system.

The thermal energy of a system depends on

i) Temperature of the body

ii) Mass of the body

Thus, the greater the mass of a substance at a particular temperature, the greater its thermal energy.  Also, at a higher temperature, an object  has greater thermal energy.

Answer + Explanations

Calculate heat absorption using the formula:

Q = mc∆T

Q means the heat absorbed, m is the mass of the substance absorbing heat, c is the specific heat capacity and ∆T is the change in temperature.

The heat absorbed is calculated by using the specific heat of water and the equation ΔH=cp×m×ΔT. 4. Water is vaporized to steam at 100oC. The heat absorbed is calculated by multiplying the moles of water by the molar heat of vaporization.

You can do this easily: just multiply the heat capacity of the substance you're heating by the mass of the substance and the change in temperature to find the heat absorbed.

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in ...

Q = mc∆T. Q = heat energy (Joules, J) m = mass of a substance (kg) c = specific heat (units J/kg∙K) ∆ is a symbol meaning "the change in"

Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.

A reaction that absorbs heat is endothermic. Its enthalpy will be positive, and it will cool down its surroundings. This reaction is exothermic (negative enthalpy, release of heat).

Quantitative experiments show that 4.18 Joules of heat energy are required to raise the temperature of 1g of water by 1°C. Thus, a liter (1000g) of water that increased from 24 to 25°C has absorbed 4.18 J/g°C x 1000g x 1°C or 4180 Joules of energy.

Answer:

Solids and gases have very different densities. A solid will have particles that are tightly packed together in a definite pattern. They have a set shape and volume and they are so compact with no room to move. On the other hand, gases will have particles that are far apart in a random pattern. The particles move independently, bouncing off of each other and all over. There is plenty of space for them to move around like they do.  

Solids have more denser than gas which has less denser.

Solids have more mass because atoms in solids are closer together so they are more denser whereas gases have their atoms far apart so they are less dense.

While on the other hand, particles in a gas are separated with no regular arrangement but solid are tightly packed placed in a regular pattern.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

in form of solid form honey possess

Answer:

Honey

Explanation:

Honey is an ancient remedy for the treatment of infected wounds, which has ... The antimicrobial properties of honey have been known to humans for ...

Abstract

Introduction

Composition

Honey production and ...

Physical properties of honey

Honey as food

Microbes in honey

0.4645 moles of carbon dioxide are produced when 18.6 g of HF are reacted with an excess amount of sodium carbonate.

To answer this question, we first need to write out the balanced chemical equation for the reaction between HF and sodium carbonate:
2HF + Na₂CO₃ -> 2NaF + CO₂ + H₂O
From this equation, we can see that for every 2 moles of HF that react, 1 mole of CO₂ is produced.
To determine the number of moles of HF in 18.6 g, we need to use the molar mass of HF, which is 20.01 g/mol:
moles of HF = mass / molar mass = 18.6 g / 20.01 g/mol = 0.929 moles
Since there is an excess amount of sodium carbonate, all of the HF will be consumed in the pressure reaction, so we can use the ratio of 2 moles HF to 1 mole CO₂ to calculate the number of moles of carbon dioxide produced:
moles of CO₂ = 0.929 moles HF x (1 mole CO₂ / 2 moles HF) = 0.4645 moles

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The relationship between a transition element's group number and its valence electrons is that the valence electrons in transition elements are found in two different energy levels, which is because of the d-orbitals.

The group number of the transition element corresponds to the number of valence electrons. It is observed that a transition element always has two valence electrons. Valence electrons are located in the outermost shell of an atom. The amount of electrons in the outermost shell varies with the group of the transition element.  

Transition elements are known for their ability to form stable ions. Due to their incomplete d-orbitals, transition elements show variable valencies.

Their ability to have multiple oxidation states is due to the presence of electrons in the partially filled d-orbitals.

Valence electrons are responsible for determining the element's chemical properties, and therefore the number of valence electrons is also indicative of how an element interacts with others in chemical reactions.

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option A is the correct one

It represents Mp orBp of a substance at a specific pressure

The molecular formula of the compound, given the empirical formula \(C_2H_7\)and assuming a molar mass of 136.36 g/mol, would be \(C_8H_{28\).

To determine the molecular formula of a compound given the molar mass and the empirical formula, we need to find the ratio between the empirical formula mass and the molar mass. This ratio will help us determine how many empirical formula units are present in one molecule of the compound.

The molar mass of the compound is given, but we don't have the actual value. However, we can proceed with the general steps to find the molecular formula.

Calculate the empirical formula mass:

The empirical formula \(C_2H_7\)consists of 2 carbon atoms with a molar mass of 12.01 g/mol each and 7 hydrogen atoms with a molar mass of 1.01 g/mol each.

Empirical formula mass = (2 * 12.01 g/mol) + (7 * 1.01 g/mol) = 34.09 g/mol

Determine the ratio between the empirical formula mass and the molar mass:

Ratio = Molar mass / Empirical formula mass

Find the whole number multiplier:

To obtain the molecular formula, we need to find the whole number multiplier by dividing the molar mass by the empirical formula mass.

Let's assume the molar mass of the compound is 136.36 g/mol (just as an example).

Multiplier = 136.36 g/mol / 34.09 g/mol ≈ 4

Multiply the subscripts in the empirical formula by the multiplier:

\(C_2H_7\)* 4 = \(C_8H_{28\)

Therefore, the molecular formula of the compound, given the empirical formula \(C_2H_7\)and assuming a molar mass of 136.36 g/mol, would be \(C_8H_{28\).

It's important to note that the value of the molar mass can affect the final molecular formula. If you have the actual molar mass of the compound, you can substitute it into the calculations to find the appropriate whole number multiplier and obtain the accurate molecular formula.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.2093023...\)

We have the final answer as

Hope this helps you

Chemical equation shows that the reactants change and form the products as a result of the reactants and products being rearranged during the reaction which result in different combinations in the products.

This is referred to as a written representation of the process that occurs during a chemical reaction and contains the reactants and products involved and an example is

H₂ + O₂ ⇒ H₂O

It shows that reactants change and form the products because the  reactants and products are rearranged during the reaction and there is also a different combinations in the products.

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In the conditions found in a patient 10 hours after aspirin ingestion, where acidosis may be present, the H2CO3/HCO3- system may not work effectively as a buffer.

The effectiveness of the H2CO3/HCO3- system as a buffer depends on the pKa of the weak acid and the pH of the solution. In the case of a patient 10 hours after aspirin ingestion, the conditions may not be suitable for the H2CO3/HCO3- system to work effectively as a buffer.

Aspirin, or acetylsalicylic acid, is metabolized in the body to salicylic acid, which can cause acidosis and decrease the pH of the blood. This decrease in pH can shift the equilibrium of the H2CO3/HCO3- system, affecting its buffering capacity.

Explanation:

The H2CO3/HCO3- system acts as a buffer in the blood by maintaining a stable pH. Carbonic acid (H2CO3) is a weak acid that can dissociate into bicarbonate ions (HCO3-) and hydrogen ions (H+). The bicarbonate ions can act as a reservoir for H+ ions, preventing large changes in pH. The effectiveness of this buffer system is determined by the pKa of carbonic acid, which is around 6.1.

However, when aspirin is ingested, it undergoes metabolism in the body to salicylic acid. Salicylic acid can cause an increase in H+ ions and lead to acidosis, a condition characterized by a decrease in blood pH. Acidosis shifts the equilibrium of the H2CO3/HCO3- system towards the formation of more carbonic acid (H2CO3) and decreases the concentration of bicarbonate ions (HCO3-). As a result, the buffering capacity of the H2CO3/HCO3- system may be compromised, and it may not effectively maintain the pH within the desired range.

Therefore, in the conditions found in a patient 10 hours after aspirin ingestion, where acidosis may be present, the H2CO3/HCO3- system may not work effectively as a buffer. Additional medical intervention may be required to restore and maintain the appropriate pH balance in the body.

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Whereas ionic bonds join metals to non-metals, metallic bonding joins a bulk of metal atoms. ... Sodium metal is therefore written as Na, not Na+. ... Both of these factors increase the strength of the bond still further. ... Heat capacity: This is explained by the ability of free electrons to move about the solid.

Answer:

I think this is the right answer, I researched this. I am not sure if this is the right answer.

Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode. ... Explosive volcanic eruptions can be dangerous and deadly.

Explanation:

Answer:

Atomic radii tend to decrease from left to right across a period and increase from top to bottom within a group.

This is because as you move from left to right across a period, the number of protons in the nucleus increases, but the number of electron shells remains the same. This means that the electrons are pulled closer to the nucleus, and the atomic radius decreases. As you move from top to bottom within a group, the number of electron shells increases, while the number of protons in the nucleus remains the same. This means that the electrons are further away from the nucleus, and the atomic radius increases.

Explanation:

Answer:

yes, A double replacement reaction has two compounds as reactants.

hence it's true.......

Answer:

it's true...

Explanation:

Answer:

what did i observe?

Explanation:

Lewis structure is the electron dot representation of the atomic and molecular bonds of the molecules. Trigonal planar is the shape of the formaldehyde.

A trigonal planar shape of the molecule is the arrangement of the central atom attached to the other three atoms making them look triangle-shaped.

The attachment of the carbon to the two hydrogens and one oxygen atom can be given by the VSEPR theory. The number of the electron pair in the molecule is 3 making them \(\rm sp_{2}\) hybridized and hence have a trigonal planar shape.

Therefore, option D.  trigonal planar is the shape.

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The exercises refer to hydrocarbons. Depending on the type of bond, it will be the termination of the name of the molecule.

For a single bond: End with the suffix -ane

For double bond: Ends in -ene

For triple bond: Ends in -yne

Let's look at each particular case

a) Heptene

Hept- means 7 carbons, so we have a compound with 7 carbons and one double bond. The formula will be:

c)Hexane

6 carbons with a simple bond

d)Pentane

5 carbons with a simple bond

e)Propyne

3 carbons with a triple bond

Stoichiometry is a branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It involves using chemical equations, which are like recipes, to determine the ratio of ingredients needed for a reaction.

The mole is a unit of measurement in chemistry that is used to ensure that the appropriate ratio of reacting particles is used for a particular reaction. A mole represents a certain number of particles, which is called Avogadro's number (6.02 x 10²³). By knowing the number of moles of a reactant, one can determine the number of moles of another reactant needed for the reaction to proceed in the appropriate ratio. This is important because chemical reactions are all about the ratio of reactants, not the absolute amounts.

Moles can also be used to determine the amount of product that will be generated by a reaction. This is done by using stoichiometry, which involves balancing the chemical equation and using mole ratios to calculate the amount of product that will be formed. This is important for industries that produce chemicals on a large scale, as they need to know how much product they will get from a certain amount of reactants.

In summary, stoichiometry is a fundamental concept in chemistry that involves using chemical equations and mole ratios to determine the appropriate ratio of ingredients for a reaction and the amount of product that will be generated. The mole is a unit of measurement that plays a crucial role in stoichiometry, as it ensures that reactions proceed in the correct ratio of reactants.

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The experiment/technique of analyzing a solution of magnesium chloride can be very useful in determining the concentration of magnesium ions in the solution. One method is to use a complexometric titration, where a known concentration of a complexing agent, such as EDTA, is added to the solution. The complexing agent forms a complex with the magnesium ions, causing a color change or the formation of a precipitate.

This experiment is useful because it allows us to accurately measure the concentration of magnesium ions in a solution. It can be used in various applications, such as testing water quality or analyzing the composition of a mixture. The results obtained from this experiment can provide valuable information for scientific research or industrial processes.

In addition to complexometric titration, other techniques can be used to analyze a solution of magnesium chloride. These include atomic absorption spectroscopy, where the absorption of light by magnesium ions is measured, and gravimetric analysis, where the mass of a precipitate formed from magnesium ions is determined.

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60.2% will be mass percentage of CaCO₃ in the mixture if the mass after heating is 1.103g.

The balanced chemical equation for the thermal decomposition of calcium carbonate is:

CaCO₃(s) ⇒ CaO(s) + CO₂(g)

The mass after heating contains CaO only.

Mass CO₂ = 1.500g - 1.103g

                 = 0.397g

Molar mass of CaCO₃ = 0.356g CO₂ *1molCO₂/44.01gCO₂ * 1molCaCO₃/1molCO₂ * 100.08/1molCaCO₃ = 0.9027

The mass percentage of calcium carbonate in the mixture is established by taking the ratio between the mass of calcium carbonate and the total mass of the mixture multiplied by 100.

%CaCO₃ = 0.9027g/1.500g * 100

              = 60.2

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