explain why numerical prefixes are not needed on the names of ionic compounds ?

The approximate pH of a 0.2 M solution of boric acid as an eye wash is around 5.14.


To understand how the pH is calculated for a solution of boric acid, it's helpful to have a basic understanding of acid-base chemistry. When an acid is dissolved in water, it donates a hydrogen ion (H+) to the water molecules, forming hydronium ions (H3O+). The more hydrogen ions present in the solution, the lower the pH (since pH is a measure of the concentration of hydrogen ions).

Boric acid (H3BO3) is a weak acid, which means it only partially dissociates in water. It donates a hydrogen ion to form the conjugate base (H2BO3^-), but some of the molecules remain undissociated. The acid dissociation constant (Ka) is a measure of how much of the acid dissociates, and is calculated by dividing the concentration of the conjugate base by the concentration of the acid.

For boric acid, Ka is 5.8 x 10^-10. This is a very small number, which means the acid is not very strong. To calculate the pH of a 0.2 M solution of boric acid, we use the formula:

pH = (1/2) x (-log(Ka) + log([HA]))

where [HA] is the concentration of the acid (0.2 M). The factor of 1/2 is because boric acid donates two protons (H+) when it dissociates, but the dissociation is incomplete, so we only count half of the protons.

Plugging in the values, we get:

pH = (1/2) x (-log(5.8 x 10^-10) + log(0.2)) = 5.14

So the pH of a 0.2 M solution of boric acid as an eye wash is approximately 5.14. This is slightly acidic, but still within the safe range for eye wash solutions.

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Answer:

See explanation

Explanation:

Atomic size increases down the group due to the addition of more shells.

As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.

Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.

The mass change of the beaker containing a dialysis tubing with 0.8M sucrose, enclosed by a dialysis bag impermeable to sucrose, is due to the movement of water molecules through the dialysis bag.

The sucrose concentration inside the dialysis tubing is higher (0.8M) compared to the sucrose concentration in the beaker (0.1M). This creates an osmotic gradient, where water molecules tend to move from an area of lower solute concentration (the beaker) to an area of higher solute concentration (inside the dialysis tubing).

As water molecules move across the dialysis bag, the beaker experiences a net loss of water, resulting in a decrease in mass. The sucrose molecules, being too large to pass through the impermeable dialysis bag, remain inside the tubing.

This process, known as osmosis, continues until the sucrose concentrations inside and outside the dialysis tubing reach equilibrium. At this point, the mass change of the beaker will stabilize, and no further net movement of water will occur.

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To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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INFORMATION:

We have:

- 66 grams of NaCl

- 255 grams of water

If the NaCl is dissolved into the water, we must find the mass percent

STEP BY STEP EXPLANATION:

To find the mass percent we must must use the next formula

In our case,

- the solute is NaCl

- the solution would be the sum of masses from NaCl and water

Then,

- mass of solute = 66 g

- mass of solution = 66 g + 255 g = 321 g

Finally, replacing in the formula,

ANSWER:

The mass percent when 66 grams of NaCl is dissolved in 255 grams of water is 20.60%

Answer:

Magnetic Forceeeeeeeeeee

The molecular geometry (form) of CCl4 SF6 is identical to the configuration of the electron domains in a VSEPR.

VSEPR distinguishes between molecular geometry, which defines how the atoms in a molecule are ordered, and electron group geometry, which expresses how electron groups (bonds and nonbonding electron pairs) are arranged.

Chemistry frequently employs the valence-shell electron-pair repulsion (VSEPR) model to foretell the three-dimensional organization, or geometry, of molecules. This model accounts for the repulsion between electron pair to estimate the structure of a molecule.

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Answer:

1000 km/s is the formula for density of liquid

Answer:

here are the answers edge2020

Explanation:

Answer:

Here is 2/5 and the next slide answers too!

Explanation:

Hope it helps!!

The specific heat of an unknown substance is calculated as follows:First, calculate the heat energy required to increase the temperature of the unknown substance from 50.0°C to 100.0°C by using the formula:Q = mcΔTwhere Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Substituting the values we have:3000.0 J = (0.465 kg) c (100.0°C - 50.0°C)Simplifying the equation:3000.0 J = 0.465 kg c (50.0°C)Dividing both sides by (0.465 kg) (50.0°C):c = 3000.0 J / (0.465 kg × 50.0°C)c = 128.21 J/(kg°C)Therefore, the specific heat of the unknown substance is 128.21 J/(kg°C).

The specific heat of the unknown substance is 128.21 J/(kg°C). It is a general understanding that the temperature of an object rises as heat is added to it. This is described by the equation ΔQ = mcΔT, which relates the quantity of heat transferred to an object with its mass, specific heat capacity, and change in temperature.

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Answer:

Image result for When mitosis occurs, what is the starting product and the final product(s)?

The result of mitosis is two identical daughter cells, genetically identical to the original cell, all having 2N chromosomes.Explanation:

Mitosis is a stage of cell division where the initial product is a parent nuclei and final products two identical daughter cells.

Mitosis is a method of replicating chromosomes where they are divided into two new nuclei. Mitosis, the process of cell division, creates genetically identical cells with a constant number of chromosomes..

Telophase and cytokinesis, which splits a cell's cytoplasm, organelles, and cell membrane into two new cells with nearly equal amounts of these biological components, frequently follow.

The division of the mother cell into two genetically identical daughter cells, or the mitotic (M) phase of an animal cell cycle, is defined by the several stages of mitosis taken collectively.

Two daughter nuclei with the same genetic makeup are the outcome.of mitosis.The remainder of the cell could then carry out further cytokinesis division to create two daughter cells.

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Answer:

epithelial tissue, connective tissue, muscle tissue, and nervous tissue.

I think its right

brainiest pls

Explanation:

Condensation is also more likely to occur when the temperature drops to the dew point.

Condensation is the process of turning a gas or vapor into a liquid. This happens when gas molecules come into contact with a cold surface and attract each other, creating tiny droplets of liquid. In nature, condensation is observed when water vapor in the air forms clouds and then rains. It can also be seen when water vapor from boiling water or steam forms droplets on the outside of a cold glass or spoon. Condensation is an important process in the water cycle and essential for fresh water production.

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Answer:

No, sodium cobalt oxide would not work as the electrode material

Explanation:

Sodium is a much larger cation than lithium. Remember that ion size is a very important consideration when developing a battery. The ions to be substituted must be nearly of the same size if one ion is to replace the other in a crystal.

Since sodium ions are larger than lithium ions, sodium cobalt oxide would not work as the electrode material in Lithium ion batteries.

Answer:

20 mL

Explanation:

The student should record 20 mL as the correct volume.

The curved surface of a liquid that is usually observed in a buret is referred to as the meniscus. This meniscus is created as a result of the surface tension of the liquid against the walls of the buret. Hence, in order to avoid errors due to parallax, the bottom of the meniscus should be read and not the top.

Therefore, the correct volume that the student should record is 20 mL.

Answer:

71%

Explanation:

Answer:

Tha nolar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.90 g/mol.

Explanation:

1 mol of Al2O3 therefore has a mass of 2(26.98)+3(16.00)=101.96 g.

Divide this into the given mass, to find the number of moles here:

(204 g)/(101.96 g/mol)=2.001 mol

There are 2 moles of aluminium per mole of aluminium oxide, so there are 2(2.001)=4.002 moles of aluminium in the sample.

Then there are (4.002 mol)(26.98 g/mol)=107.97 g of Al. Since the given mass has only 3 significant figures, round this answer o 108 g.

Answer:

im on this question i need help with it as well lol

Explanation:

Answer:

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Step-by-step explanation:

12. 5

11.

10

10

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14. 11

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

False

Explanation:

Newer pennies contain less copper and more zinc

Explanation:

Solution — 1 molecule of O2 = 2 oxygen atoms So, 1 mole of O2 = 2 mole oxygen atoms = 2 × 6.022 × 1023 = 12.044 ×1023 oxygen atoms.

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 1.2044 ×10²⁴ oxygen atoms are there in a 2 moles of oxygen atoms.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of mole of O\(_2\)= 2 mole

number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)

substituting all the given values in the above equation, we get

number of  oxygen atoms = 2 × 6.022 × 10²³

number of  oxygen atoms= 1.2044 ×10²⁴ oxygen atoms.

Therefore,  1.2044 ×10²⁴ oxygen atoms are there in a 2 moles of oxygen atoms.

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Approximately 225 sec, it will take for 75 percent of the initial amount of C\(_{25}\)H\(_3\)ON\(_3\)⁺(aq) to react. Therefore, the correct option is option B.

The logarithm of a ratio of incident over transmitted radiant power throughout a sample is known as absorbance. As an alternative, absorbance can be characterized simply "the negative logarithm with one less absorptance, as determined on a homogeneous sample," for samples that scatter light.

In several technical fields, the phrase is used to describe how experimental measurement data are quantified. Although the phrase refers to measuring how much light is absorbed, it is frequently confused with measuring how much light is "lost" to either a detector system by other methods. Approximately 225 sec, it will take for 75 percent of the initial amount of C\(_{25}\)H\(_3\)ON\(_3\)⁺(aq) to react.

Therefore, the correct option is option B.

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Your question is incomplete but most probably your full question was,

Approximately how long will it take for 75 percent of the initial amount of C25H30N3. +(aq) to react?

A. 75 sec.

B. 225 sec.

C. 300 sec.

D. 600 sec

Answer:

A. solute

Hope this helps

Answer:

2. Volcanoes

Explanation:

The interior of some planets (e.g earth) contains some hot flowing fluids called lava which has a very high thermal energy. The lava as a means of escaping the confinement within the planet, burst out by creating an opening through the ground to the surface of the planet to release the energy (lava).

This process in which the energy is released to the surface of the planet is termed volcanic eruptions. Which occurs majorly in some susceptible regions of the earth.

The openings in the ground that release energy from deep inside the planet is thus called volcanoes.

Glucose concentration causes yeast to produce more fermentation, but when the saturation gradient is reached, carbon dioxide production stops.

Chemical processes happen when atoms create or dissolve chemical bonds. Products are the molecules that are produced as a result of a chemical reaction, whereas reactants are the ingredients that initiate one.

A chemical reaction happens when one or more substances change into one or more new substances. Consider the rust that results from the reaction between iron and oxygen. When vinegar & baking soda are mixed, sodium acetate, nitrous oxide, or water are the results.

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Provide an acidic or basic environment to optimize digestion hydrochloric acid (HCl).

Food is broken down into more digestible, smaller pieces throughout the digestion process so that the body can absorb and use them.

The digestive system's secretions produce the acidic or basic environment necessary for effective digesting. In order to create a highly acidic environment, the stomach secretes hydrochloric acid (HCl), which lowers the pH of the stomach.

The small intestine, on the other hand, is kept at a pH that is somewhat basic to enhance the activity of the digestive enzymes that break down carbs, proteins, and lipids.

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Using significant figures and rounding up, the resulting mass is 80.5 g.

When using addition or subtraction, the total number of significant figures is relevant. Instead, the last significant figure of every number is considered.

In 30.05, the last significant figure is 5, and it is in the hundredths. In 50.0, the last significant figure is 0, and it is in the tenths. Finally, in 0.4006, the last significant figure is 6, and it is in the ten thousandths. Of the three, the 0 from 50.0 is in the "highest" position, and so the last significant figure of the results should also be in the tenths.

If we add the numbers up, we get:

30.05 g + 50.0 g + 0.4006 = 80.4506 g

Because the last significant figure should be in the tenths, we are going to round up 4 to 5, because trailing numbers are greater than 0, so the final mass will be 80.5 g.

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