Which type of redox reaction leads to each of the following?
(a) An increase in the number of substances

Answer:

(a) When volume increases isothermally, the molar entropy increases.

(b) When pressure increases isothermally, the molar entropy decreases.

(c) When temperature increases isobarically, the molar entropy increases.

(d) When the gas at the vapor pressure condenses, the molar entropy decreases.

(e) When two pure gas species are mixed, the molar entropy increases.

Explanation:

What is molar entropy?

Entropy is a measure of the randomness of a system. Entropy is a thermodynamic property that is measured in joules per kelvin. When the randomness of a system increases, the entropy of that system also increases.Molar entropy is the entropy per mole of a substance. It's denoted by S.

The molar entropy of a substance is usually measured in joules per kelvin per mole.

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Answer:

may be mp3 player......

Answer:

mp3 player

Explanation:

Neon sign contains Neon

Flash camera contains Xenon

Helium balloon contains Helium

Answer:

energy = heat = producers = consumer animals =

decomposers = heat

Explanation:

this is the best

The metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

The amount of heat Q = mcΔT where

Making ΔT subject of the formula, we have

ΔT = Q/mc

Given that Q and m are the same for each metal,

ΔT ∝ 1/c

We see that the temperature change is inversely proportional to the specific heat capacity.

Since the metals are at the same temperature, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

So, the metal which will reach the highest temperature is the metal with the lowest specific heat capacity.

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Answer:

A. 6atm

Explanation:

Using pressure law equation:

P1/T1 = P2/T2

Where;

P1 = initial pressure (atm)

T1 = initial temperature (K)

P2 = final pressure (atm)

T2 = final temperature (K)

According to this question;

P1 = 3 atm

P2 = ?

T1 = 120K

T2 = 240K

Using P1/T1 = P2/T2

3/120 = P2/240

Cross multiply

240 × 3 = P2 × 120

720 = 120P2

P2 = 720/120

P2 = 6atm

A basic amino acid has an R group that contains ( D) a carboxyl group.

Acid is a substance that has a pH level of lower than 7.0 and is capable of corroding or dissolving other substances. It is usually found in aqueous solutions and is a highly reactive substance. Examples of acid include sulfuric acid, hydrochloric acid, nitric acid and acetic acid. These are used in a variety of industries such as food production, industrial cleaning and chemical engineering. Acid is also used in the laboratory for titrations, pH testing and other experiments. Acids can be dangerous if mishandled and can cause skin, eye and respiratory irritation and even chemical burns.

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Answer:

0.0494×6.02.10

23

= 2.974.10²²atoms

Explanation:

A mole is the number of particles (atoms, molecules, ions) contained in a substance that is the same amount as many atoms in 12 gr C-12

1 mole = 6.02.10²³ particles

N = n x No

No = 6.02.10²³ = Avogadro's number

mol of Cu :

\begin{gathered}\tt atomic~mass~of~Cu=63.5~g/mol\\\\mol~Cu=\dfrac{3.14}{63.5}=0.0494\end{gathered}

atomic mass of Cu=63.5 g/mol

mol Cu=

63.5

3.14=0.0494

The number of atoms :

\tt 0.0494\times 6.02.10^{23}=\boxed{\bold{2.974.10^{22}~atoms}}0.0494×6.02.10 23= 2.974.10²² atoms

Therac-25, AECL was able to reduce costs by replacing hardware safety features with software controls.

the Therac-25 was a laptop-controlled radiation therapy machine produced by Atomic energy state Canada limited in 1982 after the Therac-6 and Therac-20 units. It was involved in at least six accidents between 1985 and 1987, in which patients were given massive overdoses state radiation.

The Therac-25 machine was a state-of-the-art linear accelerator developed by using the company Atomic strength Canada restricted (AECL) and a French company CGR to provide radiation treatment to cancer sufferers. The Therac-25 become the most computerized and complicated radiation therapy device state its time.

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The property that is used to calculate the pH of a solution is (A) the hydrogen ion concentration in mol/L.

pH is a measure of the acidity or basicity of a solution. The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being basic.

To calculate the pH of a solution, you need to know the concentration of hydrogen ions (H+) in mol/L (A).

pH is defined as the negative logarithm (base 10) of the hydrogen ion concentration, so the equation for calculating pH is:

pH = -log[H+]

For example, if the hydrogen ion concentration is 1 x 10^-4 mol/L,

the pH would be:

pH = -log(1 x 10^-4)

pH = 4

Note that pH is typically reported, so in this case, the pH would be reported as 4.0.
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41.7% is the percentage by mass of hydrogen (H) in lithium hydroxide (LiOH). The solution mixture is frequently defined in terms of mass percentage.

The mass percent might be used to denote a degree. Furthermore, it defines the element during a specific mixing. The solution mixture is frequently defined in terms of mass percentage. It represents the amount of solute contained in a mass m of solution.

The quantity of solutes can be stated in terms of mass or moles. We will study the percent by mass formula with numerous solved numerical examples in this post.

Mass percent = (component’s mass ÷ total mass) x 100%

                      = (1/ 23.95)x 100%

                     = 41.7%

Therefore, 41.7% is the percentage by mass of hydrogen (H) in lithium hydroxide (LiOH).

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Answer:

you have ten hydrogen atoms and five oxygen atoms in total

Explanation:

hope this helps

ANSWER

The mass of Na2SO4 is 874g

EXPLANATION

Given that;

The number of moles of HCl is 12.3 mol

Follow the steps below to find the mass of sodium sulfate produced

Step 1; Write a balanced equation for the reaction

In the reaction above, 2 moles of NaCl react with 1 mole of H2SO4 to give 2 moles of HCl and 1 mole of Na2SO4

Let the number of moles of Na2SO4 be x

The number of moles of Na2SO4 is 6.15 moles

Step 3; Find the mass of Na2SO4 using the below formula

Recall, that the molar mass of Na2SO4 is 142.04 g/mol

Therefore, the mass of Na2SO4 is 874g

The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

The milligrams and grams are is eual to the 1g = 1,000mg. 1,000 milligrams (mg) in 1 gram (g).

The conversion of  your gram figure to milligrams multiply your figure by 1000.  1mg is 1/1000g. There are 1,000 milligrams in 1 gram.

Therefore, The correct way to set up the relationship between milligrams and grams is 1mg-10-³g. option D is correct.

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Answer:

carbon

Explanation:

Answer:

carbon was discovered in space before on earth

The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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Answer:

CO2

Explanation:

You have 3 C for 6 O, then the empirical will be 1 C for 2 O

=> CO2

Answer:

A

Explanation:

particles are frozen and hence will vibrate in their fixed positions

Answer:

The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch

Explanation:

Answer:

decrease

Explanation:

Answer:

The Plasma Membrane.

Explanation:

The eukoryotic cell is enclosed in a limiting membrane called the Plasma Membrane or Plasmalemma. ❤️

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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The  complete reaction of 28.9 grams of water with excess diphosphorus pentoxide, 105 grams of phosphoric acid will be formed.

To determine the number of grams of phosphoric acid formed, we first need to balance the chemical equation. The reaction between water (H2O) and diphosphorus pentoxide (P2O5) forms phosphoric acid (H3PO4).
The balanced equation is:
P2O5 + 3H2O → 2H3PO4
From the equation, we can see that 1 mole of P2O5 reacts with 3 moles of H2O to produce 2 moles of H3PO4.
Next, we need to convert the given mass of water (28.9 grams) to moles. The molar mass of water is 18.01528 g/mol, so:

28.9 grams H2O * (1 mol H2O / 18.01528 g H2O) = 1.6 moles H2O

Since H2O is in excess, it will fully react with the available P2O5. Therefore, the moles of H3PO4 formed will be equal to half the moles of H2O:
1.6 moles H2O * (2 moles H3PO4 / 3 moles H2O) = 1.07 moles H3PO4
Finally, we can convert moles of H3PO4 to grams using its molar mass. The molar mass of H3PO4 is 97.994 g/mol, so:
1.07 moles H3PO4 * (97.994 g H3PO4 / 1 mol H3PO4) = 105 grams H3PO4

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The last third-party candidate to win one or more states was George Wallace of the American Independent Party in 1968.

Who was George Wallace?

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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518.5 atm pressure of hydrogen is needed to maintain a \(H_2\) concentration of 0.42 m

The given Henry's law constant for \(H_2\) is 8.1 × 10^-4 M atm^-1 at 25°C. To find the pressure of hydrogen needed to maintain a \(H_2\) concentration of 0.42 M, we can use Henry's law.

The equation for Henry's law is:

C = kH*P

where C is the concentration of gas in moles per liter, P is the partial pressure of the gas in atmospheres, and kH is Henry's law constant in M/atm.

Plugging the values in Henry's law equation, we get:

0.42 = (8.1 × 10^-4)P

Dividing both sides by (8.1 × 10^-4), we get:

P = (0.42)/(8.1 × 10^-4)

P = 518.5 atm

Hence, the pressure of hydrogen needed to maintain a \(H_2\) concentration of 0.42 M is 518.5 atm.

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Answer: 3 methylhexane

Explanation: Attached is a picture of the molecule. Courtesy of the National Institute of Health, United States Government.

Answer: 3-methylhexane

Explanation:

The parent chain is six carbon atoms long, so there is the prefix 'hex'

There is a methyl branch on the third carbon atom, so it is 3-methylhexane.

Answer:

C. the substance in which the solute dissolves

Explanation:

There are two terms in this... the solute and the solvent. The way I learned how to remember this is with a little pirate analogy: The loot (stolen treasure) always goes in the vent. So, the soLUTE goes in the solVENT.

Answer:

we need we need to calculate normality of solution to find out gram equivalent of solution