briefly describe how a potentiometric ph meter works. [Hint describe how the pH meter measures the amount of H+ or OH- ions in a sample]

Answer:  0.885 M

Explanation:  19.4 grams of NaCl is (19.4g/58.55 g/mole) = 0.332 moles of NaCl.  375ml is 0.375 liters.  Molar is moles per liter:  (0.332 moles NaCl/0.375 liters) = 0.885 M

Answer:

A nivel microscópico y en el marco de la Teoría cinética, es el total de la energía cinética media presente como el resultado de los movimientos aleatorios de átomos y moléculas o agitación térmica, que desaparecen en el acto.

Explanation:

esoes

Answer:5.63 atm

Explanation: Dalton's Law states that total pressure of a mixture of gasses is equal to the sum of partial pressure of each gas.

\(P_{tot} = P_{1} +P_{2}+ P_{3}...\)

We are given pressure O2 and pressure Cl2.

Step 1: First, convert 3040mmHg to atm by dividing by 760.

\(\frac{3040mmHg}{760atm} = 4 atm\)

Step 2: Plug your numbers into the equation

\(P_{tot} = P_{O2} +P_{Cl2}\)

\(P_{tot} = 4atm + 1.63 atm = 5.63 atm\)

Answer:

44x+7y

Explanation:

The number of molecules in one mole of water is 6.02 × 10²³. Therefore, the number of moles of carbon dioxide which contains 9.04 × 10²³ molecules is 1.50.

The number of atoms that constitutes one mole of a substance is called Avogadro number. It is equal to  6.02 × 10²³. Thus, one mole of every elements contains Avogadro number of atoms.

Similarly, one mole of a compound contains  6.02 × 10²³ number of molecules. Thus, one mole of carbon dioxide contains these much molecules.

Given the number of molecules of water = 9.04 × 10²³

Then, no.of moles = number of molecules/ Avogadro number.

no.of moles =9.04× 10²³ /6.022 × 10²³  = 0.68.

Therefore, the number of moles of H₂O that contains 9.04 × 10²³molecules is 1.50

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The application of force in the direction of the motion of an object. The second scenario involves applying force to a moving item that is traveling in the opposite direction.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. A force has both a direction and a magnitude.

Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Thus, Force applied to an item in motion that originates in any direction constitutes the third situation where force is created.

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Answer:

Water sweated by water from the leaf cells evaporating into the air, which pulls water and nutrients from the leaf into the air.

Answer:

three structural isomers

Pentane (C5H12) is an organic compound with five carbon atoms. Pentane has three structural isomers that are n-pentane, Iso-pentane (methyl butane) and neopentane (dimethylpropane).

The number of moles of A4B3 produced in a reaction is obtained  by stoichiometry.

The term stoichiometry refers to mass-mole relationship. The first step in solving this problem is by writing the correct reaction equation as follows;

4A + 3B -------> A4B3

If 4 moles of A yields 1 mole of A4B3

10 moles of A yields 10 * 1/4 = 2.5 moles of A4B3

Therefore, 2.5 moles of A4B3  is produced.

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Answer:

Explanation:

E = (hc)/(λ)

E = (6.624x10^(-27))Js x ((3×10^8)ms^(-1)) /

(77.8x10^(-9)m)

E = 2.55 x 10^(-11) J

Explanation:

filling air inside an empty o2 medal containers, if air is added, the air inside, creates volume inside.

due to heat, weather,... depending on what indoor or outdoor storage said containers r placed in,;

So, I can't give you an answer, due to lack of details..sorry...

The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:

The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.

The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.

The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.

Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

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For 3.50 grams of an unknown metal was placed in a graduate cylinder containing 50.0mL water initially,  the density of this unknown meta  is mathematically given as

D= 0.23 g/ml

Generally, the equation for the Volume of water  is mathematically given as

Vw= Volume of water after metal addition - Volume of water initial

Therefore

Vw = 65 ml - 50 ml

Vw= 15 ml

In conclusion,

D= Mass of metal / Volume

D= 3.5 / 15

D= 0.23 g/ml

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Answer:

\(5.12*10^2^3\) atoms

Explanation:

\(0.85 moles Fe*\frac{6.022*10^2^3}{1 mole Fe} =5.12*10^2^3\)

Use dimensional analysis to convert to moles by putting the moles of Fe (iron) on top and multiply by Avogadro's constant to cancel out moles and be left with atoms.

The name of the salt tells us that:

a) there is just one other element combined with the metal by looking at the suffix of the salt's name.

b) the presence of oxygen in a salt can be indicated by the name of the salt.

a) The name of a salt can tell us that there is just one other element combined with the metal by looking at the suffix of the salt's name. If the salt name ends in "-ide," it indicates that the salt is composed of a metal and a single non-metal element.
For example, sodium chloride (NaCl) and potassium bromide (KBr) are salts where the metal (sodium and potassium) is combined with a single non-metal element (chlorine and bromine, respectively). The "-ide" suffix suggests the presence of only one other element in the salt.

b) The presence of oxygen in a salt can be indicated by the name of the salt. If the salt name includes the element oxygen, it suggests that oxygen is present in the salt compound.
For example, sodium carbonate (Na₂CO₃) and calcium sulfate (CaSO₄) contain the element oxygen in their chemical formulas. The presence of oxygen in the salt is implied by the name and the combination of elements in the compound.

Therefore, the name of salt tells us that there is just one other element combined with the metal and there is oxygen present in the salt

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Answer:

D.) NaOH

Explanation:

Sodium always forms the cation, Na⁺.

Hydroxide is always written as OH⁻.

The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.

1.) New pressure is 341 kPa ; 2.) New volume of O2 is approx. 15 L ; 3.)  New pressure is 794 kPa ; 4.) New initial pressure of the O2 sample is 164.2 kPa ; 5.) New pressure is slightly higher than initial pressure, but it doesn't double ; 6.) Pressure of gas will increase to 1.366 atm at 100 degrees Celsius.

Boyle's law states that : pressure and volume of gas have an inverse relationship.

1.)Boyle's law equation: P1V1 = P2V2

P1 and V1 are initial pressure and volume, respectively, and P2 and V2 are final pressure and volume, respectively.

Given; P1 = 155 kPa   V1 = 22 L   V2 = 10 L

P2 = (P1V1) / V2

= (155 kPa x 22 L) / 10 L

P2 = 341 kPa

Therefore, new pressure is 341 kPa.

2.)  Gay-Lussac's law equation: (V1 / T1) = (V2 / T2)

Given, V1 = 10 L

T1 = -25°C + 273.15 = 248.15 K

T2 = 100°C + 273.15 = 373.15 K

V2 = (V1T2) / T1

= (10 L x 373.15 K) / 248.15 K

V2 = 15 L (rounded to two significant figures)

Therefore, new volume of O2 is approximately 15 L.

3.)  combined gas law equation: (P1V1) / T1 = (P2V2) / T2

Given, P1 = 501 kPa

V1 = 5.2 L

T1 = 25°C + 273.15 = 298.15 K

V2 = 7 L

T2 = 100°C + 273.15 = 373.15 K

P2 = (P1V1T2) / (V2T1)

= (501 kPa x 5.2 L x 373.15 K) / (7 L x 298.15 K)

P2 = 794 kPa

Therefore, new pressure is 794 kPa.

4.) Combined gas law equation again: (P1V1) / T1 = (P2V2) / T2

Given, V1 = 105 L   T1 = 50°C + 273.15 = 323.15 K   V2 = 55 L

T2 = -25°C + 273.15 = 248.15 K

P2 = 105.4 kPa

P1 = (P2V2T1) / (V1T2)

= (105.4 kPa x 55 L x 323.15 K) / (105 L x 248.15 K)

P1 = 164.2 kPa

Therefore, new initial pressure of the O2 sample is 164.2 kPa.

5. As (P1/T1) = (P2/T2)

(P1/283) = (P2/293)

P2 = (P1 × T2) / T1 = (1 atm × 293 K) / 283 K = 1.034 atm

So new pressure is slightly higher than the initial pressure, but it doesn't double.

6.) Gay-Lussac's law: P1/T1 = P2/T2

At 100 degrees Celsius (373 K), pressure would be:

P2 = (P1 × T2) / T1 = (1 atm × 373 K) / 273 K = 1.366 atm

So pressure of the gas will increase to 1.366 atm at 100 degrees Celsius.

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The uniformity of the cosmic background radiation implies that the source of the radiation filled the entire universe.

Radiation refers to the emission of energy in the form of waves or particles through space or a material medium. This energy can be in the form of electromagnetic waves, such as visible light, radio waves, and X-rays, or it can be in the form of particles, such as alpha and beta particles, neutrons, and protons. Radiation can be natural, such as from the sun, or it can be man-made, such as from nuclear power plants and X-ray machines. Radiation can have both beneficial and harmful effects, depending on the amount and type of radiation and the way it is used or encountered.

Here,

This is because the radiation is not stronger in any one direction or part of the universe than in others, indicating that the source was uniformly distributed throughout space. If the source had moved randomly or existed for a very short or very long time, it would not be expected to produce such a uniform distribution of radiation.

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From the calculation, the molecular mass of the  compound would be C2H4O2

We know that the molecular formula can be obtained from the use of the system;

Percentage of oxygen = 100 - (40 + 6.7)

= 53.3 %

C - 40/12,  H - 6.7/1,  O - 53.3/16

C - 3.33,  H - 6.7, O - 3.33

Dividing through by the lowest ratio we have that

CH2O

We are told that the relative molecular mass of the compound is 60 then we have that;

(12 + 2 + 16)n = 60

n = 2

The molecular formula is;

C2H4O2

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Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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The empirical formula shows the smallest integer numbers of the atoms of the elements that make up a substance. Therefore, we need to find the number that is divisible by the index of each element of the molecular formula.

The molecular formula is C6H12O6 We can divide each index by 6:

6/6 = 1

12/6 = 2

6/6 = 1

So the empirical formula is CH2O.

Answer: C1H2O1

You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer: The gas generated by two antacid tablets has a smaller volume.

Explanation:

Since the antiacid is the limiting reagent, we know that the more tablets there are, the more gas there will be.

This means that there will be more gas generated by the four antiacid tablets when compared to the two antiacid tablets, which gives us that the gas generated by the two antiacid tablets has a smaller volume.

Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

To find the standard reduction potential at 25°C for the half-reaction Ag2CrO4(s) + 2e¯ → 2Ag(s) + CrO4²-(aq), we can use the Nernst equation, which relates the standard reduction potential (E°) to the equilibrium constant (K) and the reaction quotient (Q).

The Nernst equation is given as follows:

E = E° - (RT/nF) * ln(Q)

Given information:

Ksp = 1 × 10^(-12)

E = +0.799 V (standard reduction potential of Ag+ to Ag)

Since the reaction involves the dissolution of Ag2CrO4(s), the reaction quotient Q can be expressed as [Ag+]²/[CrO4²-].

Since the stoichiometry of the reaction is 2:1 for Ag2CrO4 to Ag+, we can say that [Ag+]² = Ksp.

Therefore, Q = Ksp = 1 × 10^(-12).

Substituting the values into the Nernst equation, we have:

0.799 V = E° - (RT/2F) * ln(1 × 10^(-12))

Now, solving for E°:

E° = 0.799 V + (RT/2F) * ln(1 × 10^(-12))

The value of R is the ideal gas constant, T is the temperature in Kelvin, and F is the Faraday constant.

Please note that without specific values for temperature (T) and the ideal gas constant (R), the exact standard reduction potential at 25°C cannot be determined.

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Answer:

B. equal numbers of molecules

Explanation:

Answer: 5,266

Explanation:

5,266