A thin circular-disk earring 4.00 cm in diameter is plated with a coating of gold 0.25 mm thick from an Au³⁺ bath.(a) How many days does it take to deposit the gold on one side of one earring if the current is 0.013 A (d of gold = 19.3 g/cm³)?

Answer:

Structure:

Differences-  A polymer is a collection of a large number of molecules whereas a monomer is a single molecule.

A monomer is a single molecule, which has the ability to chemically bond with other monomers in a long chain. A polymer is a chain that is made when monomers bind with other monomers.

Similarities-  They are both molecules

Properties:

Differences- Monomers have polyfunctionality, which is the capacity to form chemical bonds to at least two other monomer molecules. Polymers are chemically unreactive, solids at room temperature, malleable, tough, and are electrical insulators.

Similarities- They both makeup larger forms of matter.

Intermolecular Forces

Differences: Polymers are held together by covalent bonds, hydrogen bonds, and dispersion bonds. Monomers are only held together by hydrogen bonds.

Similarities: They can both be bonded together by hydrogen bonds.

Answer:

The boiling point will be reduced

Answer:

It would be this below.

Explanation:

I am not 100% sure this is write but I did my best this is still kinda hard for me. I just did this a few years ago and i struggled with it but I have been doing better since then.

Hope this helps :))

Answer: four , double

Explanation:

Saturated hydrocarbons are defined as the hydrocarbons in which a single bond is present between carbon and carbon atoms. The general formula for these hydrocarbons is \(C_nH_{2n+2}\)

Unsaturated hydrocarbons are defined as the hydrocarbons which have double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is  \(C_nH_{2n}\) and \(C_nH_{2n-2}\)

Butene is \(CH_3CH_2CH=CH_2\) has molecular formula of \(C_4H_8\) and thus has four carbon atoms and one double bond or pi bond.

Answer: 51.6667c    324.817K

Explanation:

125°F temperature in degrees Celsius is 51.67  °C and in kelvins is 324.67 kelvin.

Temperature is a bodily amount that expresses the hotness of a count number or radiation. There are 3 kinds of temperature scales.

Temperature is the diploma or depth of the warmth present in a substance or a machine, expressed primarily based on the comparative scale and proven by a thermometer. In other phrases, Temperature is the degree of hotness or coldness of a frame measured by the usage of Celsius, Kelvin, and Fahrenheit scales.

Temperature is measured with thermometers. commonplace thermometers include a tumbler rod with a totally skinny tube in it. The tube carries a liquid that is furnished from a reservoir, or "bulb," at the base of the thermometer. every now and then the liquid is mercury, and every so often it is pink-colored alcohol.

To convert °C into Fahrenheit:-

F = 9/5 °C + 32

°C = (F - 32)× 5/9

    = (125 -32) × 5/9

    = 93 × 5/9

     = 51.67  °C

°C into Kelvin:-

K= °C  + 273

k =  51.67 + 273

   = 324.67 kelvin.

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Answer:

C

Explanation:

Carbon forms triple bonds will form triple bonds with other carbon and forms ethyne. The triple bonded hydrocarbons are commonly called as alkynes. Hence, option C ethyne is correct.

Carbon forms bond with other carbons and exhibit the property of catenation to form long chains. The backbone of hydrocarbons are the carbon - carbon bonds.

There are three types of hydrocarbons namely, alkanes, alkenes and alkynes. Alkanes are saturated hydrocarbon having single bond between carbon atoms. Eg. methane , ethane etc all having suffix of 'ane'. Alkenes are unsaturated hydrocarbons with double bond between two or more carbon atoms.

Alkenes are named with the suffix 'ene'. Hence, the names become ethene, propene etc. When triple bonds forms between carbon atoms they are called alkynes and are unsaturated. Alkynes are named with the suffix 'yne' like ethyne, propyne etc.. Hence, two carbon with triple bond between them is ethyne.

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Answer:

50 Points Help 1) Find the mass of 250.0 mL of benzene. The density of benzene is 0.8765 g/mL.  

7) What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3.

Answer:

At 13.6 C, a 1.2 mole sample of a gas exerts a pressure of 2.4 atmospheres. 1 point If you were solving for volume, what number would you use for temperature in the ideal gas law equation (PV = nRT)? о O 13.6 o 1.2 0 24 O 286.6 0 275.4

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There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the  nature of radioactive decay does not support the given statement.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Decay of radioactive element always comes under first order kinetics.

The rate law for first order kinetics is

K=(2.303/T)×log(a/a-x)

half life=0.693/K

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

Consistency and predictability are imperatives to the experience of a safe environment.  The nature of radioactive decay does not support this.

Therefore, the  nature of radioactive decay does not support the given statement.

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The following substances can behave as Bronsted-Lowry acids in aqueous solution: HNO₃ and  NH₄+

The correct answer is a and b.

The Bronsted-Lowry acid theory is a chemical theory that explains acids and bases and their reactions. It defines acids as proton donors and bases as proton acceptors.

According to the definition provided by Bronsted–Lowry, an acid is a proton (H+) donor, while a base is a proton acceptor. At the point when a Brønsted-Lowry corrosive loses a proton, a form base is shaped. Similarly, a conjugate acid is produced when a Bronsted–Lowry base acquires a proton.

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Answer:

1 AMU

Explanation:

Protons, neutrons, and electrons: Both protons and neutrons have a mass of 1 amu and are found in the nucleus.

To answer this question we have to usethe ideal gas law:

Where P is the pressure, V is the volume, n is the number of moles, R is the constant of ideal gases (0.082atmL/molK) and T is the temperature (in Kelvin degrees).

The first step is to convert the given mass of N2 to moles using its molecular mass:

And convert the pressure from mmHg to atm (1atm=760mmHg):

Finally, solve the initial equation for T and replace for the given values:

The temperature of the gas is 539.15K.

Convert this temperature to Celsius by substracting 273.15 to the temperature in Kelvins:

The temperature of the gas is 226°C.

Answer:

X = electrons from hydrogen

O (black) = electrons from oxygen

O (red) = electrons from when it was connected to a metal atom, hence why it has a negative charge

Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

To determine the best buffer with a basic pH using the given pKa value for HC3H2O2, we need to find a pair of substances where one acts as a weak acid (HC3H2O2) and the other as its conjugate base (C3H2O2-).

The pKa of HC3H2O2 represents the pH at which the acid is 50% ionized. Since we want a basic pH, we need a pKa value that is slightly higher than the desired pH. Let's assume the desired pH is around 9.

A quick calculation shows that a pKa of 8.5 would be suitable for our purpose.

Now, we need to find a conjugate base with a pKa close to 8.5. One example is ammonium acetate (NH4C2H3O2) with a pKa of 9.25. When ammonium acetate is dissolved in water, it dissociates into NH4+ (conjugate acid) and C2H3O2- (conjugate base).

Therefore, the best buffer pair for a basic pH would be HC3H2O2 (acetic acid) and NH4C2H3O2 (ammonium acetate).

The pKa value of HC3H2O2 is not provided in the question. However, assuming we have the pKa value of HC3H2O2, we can use it to calculate the pH range over which the buffer will be effective.

The Henderson-Hasselbalch equation is commonly used to calculate the pH of a buffer solution:

pH = pKa + log ([A-]/[HA])

In this equation, [A-] represents the concentration of the conjugate base, and [HA] represents the concentration of the weak acid.

To create a buffer with a basic pH, we need a pKa slightly higher than the desired pH. Assuming a desired pH of 9, we can use a pKa value around 8.5.

Let's consider ammonium acetate (NH4C2H3O2) as a potential conjugate base for HC3H2O2. The pKa value of ammonium acetate is 9.25.

Using the Henderson-Hasselbalch equation, we can determine the pH range over which the buffer will be effective. For a basic pH, we want the [A-]/[HA] ratio to be high, indicating a significant concentration of the conjugate base.

With a pKa of 8.5 for HC3H2O2 and a pKa of 9.25 for NH4C2H3O2, we can calculate the pH range as follows:

pH = pKa + log ([A-]/[HA])

pH = 8.5 + log ([C2H3O2-]/[HC3H2O2])

To ensure a high [C2H3O2-]/[HC3H2O2] ratio, we can adjust the concentrations of the weak acid and its conjugate base accordingly. By choosing appropriate concentrations, we can achieve a pH in the desired range.

Based on the given pKa value for HC3H2O2, the best buffer pair for a basic pH would be HC3H2O2 (acetic acid) and NH4C2H3O2 (ammonium acetate) with a pKa of 8.5 for HC3H2O2 and a pKa of 9.25 for NH4C2H3O2. By adjusting the concentrations of the weak acid and its conjugate base

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Answer:

it will option A . hope it helps

Answer:

options A

Explanation:

the balloon filled up because of the formation of gas bubbles

Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation:

The inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

The inflation rate from 2014 to 2015, assuming that 2014 is the base year, can be determined using the Consumer Price Index (CPI). The CPI measures the cost of goods and services over time and is used to calculate inflation. The formula for calculating inflation rate using CPI is as follows: Inflation rate = ((CPI year 2 - CPI year 1) / CPI year 1) x 100To solve this problem, we first need to calculate the CPI for each year using the prices and quantities of nuts and meat.

Calculating CPI for 2014:CPI 2014 = (300 x $9) + (175 x $19) = $5,625 Calculating CPI for 2015:CPI 2015 = (420 x $9) + (340 x $14) = $9,460Using the CPI formula, we can calculate the inflation rate from 2014 to 2015:Inflation rate = ((CPI 2015 - CPI 2014) / CPI 2014) x 100= (($9,460 - $5,625) / $5,625) x 100= $3,835 / $5,625 x 100= 68.09% (to 2 decimal places) Therefore, the inflation rate from 2014 to 2015, assuming 2014 as the base year, is 68.09%.

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They are all formed from ancient organic material that was buried under many layers of sediment and not allowed to decay.

What are organic materials?

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There  are approximately 1.47 x 10^24 copper atoms in 2.45 mol of copper.

To calculate the number of copper atoms in 2.45 mol of copper, we can use Avogadro's number, which is defined as the number of atoms in one mole of an element. Avogadro's number is approximately 6.022 x 10^23 atoms per mole.

To calculate the number of atoms in 2.45 mol of copper, we can use the following steps:

1. Multiply the number of moles by Avogadro's number:
  2.45 mol * 6.022 x 10^23 atoms/mol = 1.47 x 10^24 atoms

Therefore, there are approximately 1.47 x 10^24 copper atoms in 2.45 mol of copper.

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Answer: The water will taste sour.

Explanation:

Answer: D. The water will taste sour (Edmentum)

Explanation:

Answer: The answer is D :)

Explanation:

Answer:

D

Explanation:

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute.

3. CO2 and pH have a direct relationship that affects minute ventilation.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation.

1. The gas whose concentration decreases when pCO2 levels increase in order to maintain oxygen levels is nitrogen. As the amount of CO2 in blood increases, the body compensates by decreasing the concentration of nitrogen gas in the inhaled air.

2. Minute ventilation is the total volume of air that is breathed in and out in one minute. When inhaled air contains 5% carbon dioxide, minute ventilation will increase to help remove the excess carbon dioxide from the body.

3. CO2 and pH have a direct relationship that affects minute ventilation. When CO2 levels increase, the pH decreases and causes the respiratory rate to increase. This increased ventilation helps to remove excess CO2 and restore the pH balance.

4. Inhaling increased amounts of CO2 can affect pulmonary ventilation in a number of ways. The increased levels of CO2 can cause the respiratory rate to increase, leading to hyperventilation. This can cause dizziness, shortness of breath, and other symptoms. Additionally, it can lead to respiratory acidosis if the body is unable to compensate for the increased CO2 levels.

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Complete question is;

Which of the following kinds of cells perform basic functions such as obtaining energy from food?

A) Plant cells, but not animal cells

B) Animal cells, but not plant cells

C) Both plant cells and animal cells

D) Neither animal cells nor plant cells

Answer:

Option C: Both plant cells and animal cells.

Explanation:

Correct Answer is;

Option C: Both plant cells and animal cells.

This is because both plant and animal cells need food for survival as food gives energy for movement and work operations.

Other options are not correct because they infer that either cell or none of them obtains energy from food which is false.

Answer:

Catalyst:

Explanation:

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

answer is B value of approximation

solving

The heat of vaporization for water is 40.7 kJ/mol, which means that it takes 40.7 kJ of energy to convert 1 mole of water from a liquid to a gas phase.

The energy required to boil the water is given as 63.8 kJ.

We can set up a proportion using these values:

40.7 kJ/1 mol = 63.8 kJ/x mol

To solve for x (the number of moles of water), we can cross-multiply and solve the equation:

40.7 kJ * x mol = 63.8 kJ * 1 mol

x mol = (63.8 kJ * 1 mol) / 40.7 kJ

x mol ≈ 1.57 mol

Since we know the molar mass of water is approximately 18.015 g/mol, we can convert moles to grams:

1.57 mol * 18.015 g/mol ≈ 28.29 g

Therefore, the mass of the sample of water is approximately 28.29 grams.

Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

The balanced equation provided is:

6CO2 + 6H2O -> C6H12O6 + 6O2

From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.

The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:

(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)

Solving for x, we can cross-multiply:

6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose

43.2 moles H2O = x moles H2O

Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.

To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:

Mass of water = moles of water * molar mass of water

Mass of water = 43.2 moles * 18 g/mol

Mass of water = 777.6 g

Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.

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The concentration of H+ ions in the solution is the same as the concentration of H3O+ ions, which we have calculated to be 7.61 x 10^(-9) mol/L.

To calculate the concentration of H3O ions present in a solution of HCl that has a measured pH of 8.110, we need to use the equation pH = -log[H3O+]. Rearranging the equation, we get [H3O+] = 10^(-pH).
Substituting the given pH value of 8.110, we get [H3O+] = 10^(-8.110) = 7.61 x 10^(-9) moles per liter (mol/L).
Therefore, the concentration of H3O ions present in the solution is 7.61 x 10^(-9) mol/L. This means that the solution is basic since the pH is greater than 7, and there are very few H3O+ ions present in the solution.
It is important to note that HCl is a strong acid and completely dissociates in water, meaning that all of the HCl molecules have broken apart into H+ and Cl- ions. The H+ ions then react with water molecules to form H3O+ ions. Thus, the concentration of H+ ions in the solution is the same as the concentration of H3O+ ions, which we have calculated to be 7.61 x 10^(-9) mol/L.

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