How many silver atoms are there in 3. 86 g of silver?.

Answer:

54.09

Explanation:

Avogadro's number (6.022 × 1023) is defined as the number of atoms, molecules, or "units of anything" that are in a mole of that thing. So to find the number of moles in 3.4 x 1023 molecules of H2SO4, divide by 6.022 × 1023 molecules/mole and you get 0.5646 moles but there are only 2 sig figs in the given so we need to round to 2 sig figs. There are 0.56 moles in 3.4 x 1023 molecules of H2SO4

Note the way this works is to make sure the units are going to give us moles. To check, we do division of the units just like we were dividing two fractions:

(molecules of H2SO4) = (molecules of H2SO4)/1 and so we have 3.4 x 1023/6.022 × 1023 [(molecules of H2SO4)/1]/[(molecules of H2SO4)/(moles of H2SO4)]. Now, invert the denominator and multiply:

Answer:

The word gentle traces back to the Latin word gentlis, meaning “of the same clan,” and at first the world was used to describe people belonging to distinguished families, who were seen as courteous and noble. Nowadays you’re more likely to hear the word used to refer to things that are calm, moderate, and without harshness. The word is often applied to people, but it can be used more broadly to describe anything that is mild, such as "a gentle detergent" or "a gentle reminder."

Answer:

About 0.054 moles.

Explanation:

Apply the ideal gas law. Recall that:

\(\displaystyle PV = n RT\)

Solve for n, the number of moles:

\(\displaystyle n = \frac{PV}{RT}\)

Determine the pressure of the hydrogen gas. Recall that by Dalton's Law of Partial Pressures, the total pressure is equal to the sum of the partial pressures of each individual gas:

\(\displaystyle P_T = P_\ell + P_\text{H$_2$}\)

Convert the vapor pressure of the liquid to atm (1.00 atm = 760. torr):

\(\displaystyle 18\text{ torr} \cdot \frac{1.00\text{ atm}}{760.\text{ torr}} = 0.024\text{ atm}\)

Therefore, the partial pressure of the hydrogen gas is:

\(\displaystyle \begin{aligned} P_T & = P_\ell + P_\text{H$_2$} \\ \\ (0.788\text{ atm}) & = (0.024\text{ atm}) + P_\text{H$_2$} \\ \\ P_\text{H$_2$} & = 0.764\text{ atm}\end{aligned}\)

Therefore, the number of moles of hydrogen gas present is (the temperature in kelvins is 273.15 + 20.0 = 293.2 K):

\(\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{(0.764\text{ atm})(1.7\text{ L})}{\left(0.08206 \text{ }\dfrac{\text{L-atm}}{\text{mol-K}}\right)(293.2\text{ K})}\\ \\ & = 0.054\text{ mol H$_2$} \end{aligned}\)

Answer:

We will have zero bonds

Explanation:

In this case, we have to start with the structure of 4,5-diethyloctane. This name ends with the suffix "ane" therefore we have an alkane. All the alkanes are made with single bonds between carbons and single bonds between carbon and hydrogen.

The molecule will have a carbon chain of eight carbons and we will have 2 branches, one ethyl on carbon 4 and another ethyl on carbon 5. (see figure 1)

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

There are two types of chemical reactions namely exothermic and endothermic reaction.

Given the heat of solution of KI as 20.3 kJ/mol.

Since it is positive, the reaction is exothermic and  ΔH is positive

Since the heat of solution of KI is 20.3 kJ/mol, the answer to the question is a. Exothermic, ΔH is positive

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Answer:

The bond order is 1.091

Explanation:

there really is no explanation.

The van der Waals parameter 'a' value that should be assigned to CH3CN is 17.58.

To determine the van der Waals parameter (a) value for CH3CN, we must first understand the significance of the van der Waals equation and the parameter "a" itself. The van der Waals equation accounts for the non-ideal behavior of gases by considering the finite size of gas particles and the attractive forces between them.

The "a" parameter represents the strength of the attractive forces between the gas particles.

Generally, larger and more polarizable molecules have higher "a" values due to stronger attractive forces. Now, let's compare the four given gases - CO2, CH3CN, Ne, and CH4.

1. CO2 (carbon dioxide) is a linear, non-polar molecule, but it has a relatively large molecular weight.
2. CH3CN (acetonitrile) is a polar molecule with a cyano group (-C≡N) and a methyl group (-CH3), leading to stronger attractive forces.
3. Ne (neon) is a noble gas with weak attractive forces due to its small size and low polarizability.
4. CH4 (methane) is a non-polar molecule with a smaller size compared to CO2 and CH3CN.

Based on this information, we can roughly rank the gases in terms of their expected "a" values: CH3CN > CO2 > CH4 > Ne.

Now, let's match the given values (0.2107, 2.253, 3.392, 17.58) to the compounds:

1. Ne has the smallest "a" value, so it corresponds to 0.2107.
2. CH4 has the next smallest "a" value, so it corresponds to 2.253.
3. CO2 has a larger "a" value than CH4, so it corresponds to 3.392.
4. CH3CN has the largest "a" value, so it corresponds to 17.58.

Thus, the "a" value assigned to CH3CN should be 17.58.

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For example, the atomic mass of an oxygen atom is 16.00 amu; that means the molar mass of an oxygen atom is 16.00 g/mol. Further, if you have 16.00 grams of oxygen atoms, you know from the definition of a mole that your sample contains 6.022 x 10^23 oxygen atoms.

The enthalpy change for reaction a by using Hess's law → c is +74 kJ.

Hess's Law states that if a reaction can be expressed as the sum of two or more other reactions, the enthalpy change of the overall reaction is the sum of the enthalpy changes of the individual reactions.

Given reactions:

a → b ΔH = +18 kJ

b → c ΔH = +56 kJ

By observing the reactions, it can be seen that the intermediate species "b" cancels out, the desired reaction: a → c

The overall enthalpy change:

ΔH(a → c) = ΔH(a → b) + ΔH(b → c)

ΔH(a → c) = +18 kJ + (+56 kJ)

ΔH(a → c) = +74 kJ

Therefore, the enthalpy change for the reaction a → c is +74 kJ.

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Answer:

Magnesium chloride

Answer:

Thermal energy transfer involves the transfer of internal energy. The three types of thermal energy transfer are conduction, convection and radiation. ... Those are both good examples of convection, the movement of warm particles from warmer to cooler locations, Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

Explanation:

Hope this helps!

Answer:

thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)

heat is the thermal energy that flows from one substance to another due to a temperature difference.  

Thermal energy is measured in temperature change.

Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).

conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.

convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.

radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.

An old sandwich going bad in the garbage and baking an apple pie are two examples of chemical reactions, which they both share.

Baking soda and vinegar producing carbon dioxide, iron rusting, and wood burning are a few examples of chemical changes. The metabolization of food and the production of amylase from the combining of sugar and saliva are only two examples of the many chemical processes that the body produces.

A chemical change occurs when the molecules that make up two or more compounds are rearrange to form a new substance. When you bake, you start with a range of ingredients.

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Paracelsus, a sixteenth-century alchemist, and healer, adopted the slogan "the patients are your textbook, the sickbed is your study." This view is not consistent with using the scientific method.

The scientific method relies on systematic observation, experimentation, and hypothesis testing to gather evidence and draw conclusions.

Paracelsus' approach, on the other hand, seems to prioritize learning from individual patients and their experiences rather than following a systematic and evidence-based approach.

While his approach may have had value in certain contexts, it does not align with the principles of the scientific method.

So,  this view is not consistent with using the scientific method.

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Atoms with greatly differing electronegativity values are expected to form ionic bonds.

Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. When atoms with significantly different electronegativity values come together, they tend to form ionic bonds. Ionic bonding occurs between a highly electronegative atom, known as the electron acceptor or cation, and a less electronegative atom, known as the electron donor or anion.

In an ionic bond, the electron donor atom transfers one or more electrons to the electron acceptor atom, resulting in the formation of positively charged cations and negatively charged anions. The oppositely charged ions are held together by strong electrostatic forces of attraction, creating a stable ionic compound.

The large electronegativity difference between the atoms leads to the transfer of electrons rather than their sharing, as seen in covalent bonding. Ionic compounds typically exhibit high melting and boiling points, are often solid at room temperature, and have crystalline structures. Examples of ionic compounds include sodium chloride (NaCl) and calcium carbonate (CaCO₃).

In summary, atoms with significantly different electronegativity values are expected to form ionic bonds, resulting in the creation of stable ionic compounds.

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Answer: Well most if not all metals rust due to oxidation. Most can be melted at certain temperatures or just heated to a certain degree to be maluable

Explanation:

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The future value of the cash flows in Year 4, given a discount rate of 9 percent, is $3,109.37.

To calculate the future value, we can use the formula for the future value of a series of cash flows. We multiply each cash flow by its corresponding discount factor, which is determined by raising (1 + discount rate) to the power of the number of periods.

In this case, the future value of the cash flows in Year 4 can be calculated as follows:

Future Value = ($1,040 / (1 + 0.09)^1) + ($1,270 / (1 + 0.09)^2) + ($1,490 / (1 + 0.09)^3) + ($2,230 / (1 + 0.09)^4) = $3,109.37.

This calculation takes into account the time value of money, reflecting the fact that receiving cash flows in the future is less valuable than receiving them in the present. The discount rate of 9 percent represents the required return or opportunity cost of investing in this project. By calculating the future value, we can assess the total worth of the cash flows at the end of Year 4.

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Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

Option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

The long-run equilibrium condition for perfect competition is that price (P) is equal to average total cost (ATC), which is also equal to marginal cost (MC), and marginal revenue (MR).

Option (d), P=ATC=MR=MC, best represents the long-run equilibrium condition for perfect competition. In perfect competition, firms operate at the minimum point of their average total cost curve, where price equals both average total cost and marginal cost. This condition ensures that firms are earning zero economic profit and are producing at an efficient level.

In the long run, if firms are earning economic profit, new firms will enter the market, increasing competition and driving prices down. Conversely, if firms are experiencing losses, some firms may exit the market, reducing competition and causing prices to rise. This process continues until firms reach a state where price equals average total cost, marginal cost, and marginal revenue, ensuring a long-run equilibrium.

Therefore, option (d), P=ATC=MR=MC, accurately represents the long-run equilibrium condition for perfect competition, reflecting the balance between price and cost for firms operating in a competitive market.

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The chlorine element is present in group 7.

The elements which has 7 valence electrons , is kept in group 7.

1) Chlorine (Cl):

The atomic number of chlorine is 17 and its electronic configuration is 2,8,7. It has 7 valence electrons. Hence, it will be kept in group 7.

2) Oxygen (O):

The atomic number of oxygen is 8 and its electronic configuration is 2,6.

It has 6 valence electrons. Hence, it will be kept in group 6.

3) Lithium (Li)

The atomic number of chlorine is 3 and its electronic configuration is 2,1. It has 1 valence electrons. Hence, it will be kept in group 1.

4) Calcium (Ca):

The atomic number of calcium is 20 and its electronic configuration is 2,8,8,2. It has 2 valence electrons. Hence, it will be kept in group 2.

Therefore, chlorine element will be kept in group 7.

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Answer:

c. Looking for improvements

Explanation:

I took the quiz and it was right

Answer: C

Explanation:

just took the test

The theoretical yield of the products would be 88.0 g of \(CO_2\) and 54.0 g of \(H_2O\).

The balanced equation for the reaction of 1 mol of ethane (\(C_2H_6\)) with \(O_2\) at -135°C is:

\(C_2H_6 (g) + 3 O_2 (g) = 2 CO_2 (g) + 3 H_2O (g)\)

According to the balanced equation, 1 mole of \(C_2H_6\) reacts with 3 moles of \(O_2\) to produce 2 moles of \(CO_2\) and 3 moles of \(H_2O\).

To find the theoretical yield of the product(s), we need to know the amount of ethane that is being reacted.

Assuming that we have 1 mole of ethane (\(C_2H_6\) ), we can calculate the theoretical yield of the products as follows:

The molar mass of \(CO_2\) is:

12.0 g/mol (C) + 2(16.0 g/mol) = 44.0 g/mol

The molar mass of \(H_2O\) is:

2(1.0 g/mol) + 16.0 g/mol = 18.0 g/mol

From the balanced equation, we know that 1 mole of \(C_2H_6\) produces 2 moles of \(CO_2\) and 3 moles of \(H_2O\). Therefore, the theoretical yield of \(CO_2\) would be:

moles of \(CO_2\) = 2 x moles of \(C_2H_6\)

If we assume that we have 1 mole of \(C_2H_6\), then the theoretical yield of \(CO_2\) would be:

moles of \(CO_2\) = 2 x 1 = 2 moles

mass of \(CO_2\) = moles of \(CO_2\) x molar mass of \(CO_2\) = 2 mol x 44.0 g/mol = 88.0 g

Similarly, the theoretical yield of \(H_2O\) would be:

moles of \(H_2O\)  = 3 x moles of \(C_2H_6\)

If we assume that we have 1 mole of \(C_2H_6\), then the theoretical yield of \(H_2O\) would be:

moles of \(H_2O\) = 3 x 1 = 3 moles

mass of \(H_2O\) = moles of \(H_2O\) x molar mass of \(H_2O\) = 3 mol x 18.0 g/mol = 54.0 g

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Both SN2 and SN1 mechanisms are possible in the reaction between the tosylate and sodium cyanide, resulting in different major products with potential stereochemistry.

In the reaction between tosylate and sodium cyanide, two possible mechanisms can occur: SN2 and SN1. The choice between these mechanisms depends on the reaction conditions and the structure of the reactants. In the SN2 mechanism, the nucleophilic cyanide ion attacks the carbon atom of the tosylate, resulting in inversion of stereochemistry if the tosylate is chiral. The major product in this case would be the substitution product with the cyanide group replacing the tosylate group. On the other hand, in the SN1 mechanism, the tosylate first dissociates to form a carbocation intermediate, which then reacts with the nucleophilic cyanide ion.

In this case, the stereochemistry of the tosylate is lost, and the major product is the substitution product with the cyanide group attached to the carbocation. The specific details of the mechanism, including the movement of lone pairs, formal charges, and reaction arrows, depend on the specific reaction conditions and the structures of the reactants.\

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Answer:

a

Explanation:

Answer:

Anions name is given to a non-metal when it forms an ion, and it has negative charge.

Answer:

Non metals form negative ions and negatively charged ions are called anions.

Hope I'm correct!!