Sound waves move the slowest through which medium :
water
ice
air
wood

True when carbon dioxide dissolves in rainwater carbonic acid forms which raises the ph of rainwater above 7.0

When carbon dioxide dissolves in rainwater, it forms carbonic acid. This lowers the pH of the rainwater, making it more acidic than 7.0. However, over time, the carbonic acid reacts with minerals in the soil, neutralizing its acidity and bringing the pH closer to neutral.

When carbon dioxide dissolves in rainwater, it forms carbonic acid which lowers the pH of the rainwater. This is because carbonic acid is a weak acid that can dissociate to form hydrogen ions (H+) and bicarbonate ions (HCO3-), which increase the acidity of the solution. As a result, the pH of rainwater can drop below 7.0. However, this acidity is temporary as carbonic acid eventually reacts with minerals in the soil to neutralize its acidity.

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The statement "For an acid base indicator to work well for your titration, it should change color" is True. As an acid-base indicator is a substance that changes color in response to changes in the pH of a solution.

During a titration, the indicator is used to monitor the progress of the reaction and to determine when the endpoint, or the point at which the reaction is complete, has been reached.

For an indicator to work well in a titration, it should change color over a narrow pH range, typically around the endpoint of the reaction. This allows the endpoint to be easily and accurately determined, as the color change indicates a sudden change in the pH of the solution.

There are many different types of acid-base indicators available, each with different color changes over different pH ranges. Common examples include litmus, phenolphthalein, and bromothymol blue. The choice of indicator will depend on the type of reaction being performed and the pH range of the solution being titrated.

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there an A B C D thing?

Explanation:

890

Answer: thrusters

Explanation: got it right

Answer: A.HCI

Explanation:

Answer:

Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Evidence. Experiment and/or observation as benchmarks for testing hypotheses.

Answer:

science is bigyan

Explanation:

vigyan

A brownfield is a property, the expansion, redevelopment, or reuse of which may be complicated by the presence or potential presence of a hazardous substance, pollutant, or contaminant.

A “brownfield” generally refers to a parcel of land that was previously used for industrial purposes and which is contaminated by low concentrations of hazardous chemicals.

A brownfield development requires more work and investment upfront: existing structures may have to be demolished, materials must be removed, and developers may have to engage in extensive environmental cleanup to remove pollutants.

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Answer:

B

Explanation:

Answer:

D. 3 mol/0.5 L

Explanation:

Just took the quiz

The number of molecules in 9.4 moles of ibuprofen is equal to  5.66 × 10²⁴.

A mole of a substance can be described as an international standard unit that is used to calculate a given count of any particles. The particles that are counted in the unit of the mole are as chemically identical entities, individually distinct.

A mole can be used to calculate atoms, molecules, ions, or other particular particles. The 6.023 × 10 ²³ number of units present in one mole is known as Avogadro’s constant.

Given, the number of moles of ibuprofen = 9.4 mol

The number of molecules of ibuprofen in one mole = 6.023 × 10²³

The number of molecules of ibuprofen in 9.4 moles = 6.023 × 10²³ ×9.4

Number of molcules of ibuprofen = 5.66 × 10²⁴ molecules

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The mole fraction of \(CH_3OH\)in the solution is 0.850 or 85.0%.

To calculate the mole fraction (Χ) of methanol (CH3OH) in the given solution, we need to determine the number of moles of CH3OH and the number of moles of \(C_6H_5COOH\)(benzoic acid) in the solution.

First, we can calculate the number of moles of CH3OH using its volume and density:

Mass of CH3OH = Volume x Density = 8.50 mL x 0.792 g/mL = 6.732 g

Number of moles of CH3OH = Mass / Molar mass = 6.732 g / 32.04 g/mol = 0.210 mol

Next, we can calculate the number of moles of \(C_6H_5COOH\)using its mass and molar mass:

Number of moles of C6H5COOH = Mass / Molar mass = 4.53 g / 122.12 g/mol = 0.0371 mol

The total number of moles of solute in the solution is the sum of the moles of CH3OH and C6H5COOH:

Total number of moles = 0.210 mol + 0.0371 mol = 0.247 mol

Finally, we can calculate the mole fraction of \(CH_3OH\)using its number of moles and the total number of moles:

Mole fraction of \(CH_3OH\)= Number of moles of \(CH_3OH\)/ Total number of moles = 0.210 mol / 0.247 mol = 0.850

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0.87 g of hydrogen is produced by the reaction of 7.80 g of calcium with 1.83 g of water.

To find the amount of hydrogen produced in the reaction, we need to calculate the theoretical yield of hydrogen. This is done by finding the amount of calcium and water that react and finding the amount of hydrogen that is produced from this amount.

From the given information, 7.80 g of calcium reacts with 1.83 g of water. We can use the balanced equation for the reaction to find the amount of hydrogen produced:

Ca + 2H₂O -> Ca(OH)₂ + H2

From this equation, 1 mole of calcium reacts with 2 moles of water to produce 1 mole of hydrogen.

So, the theoretical yield of hydrogen is (1.83 g/mole) x (1 mole/2 moles) = 0.92 g of hydrogen.

Finally, the actual yield of hydrogen is found by multiplying the theoretical yield by the reaction yield, which is 94.4%.

The actual yield of hydrogen = 0.92 g x 94.4% = 0.87 g

Therefore, 0.87 g of hydrogen is produced by the reaction of 7.80 g of calcium with 1.83 g of water.

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Eight electrons are shown in rings that correspond to distinct energy levels in a representation of an atom, with two in the first energy level and six in the second.

In the region surrounding an atom's nucleus, called the electron cloud, electrons are found. The electron is just one example of a group of elementary particles that make up an atom. Electrons, like all elementary particles, can clash with other particles and can display wavelike qualities when they are diffracted.

The tiniest component of ordinary matter, an atom, makes up a chemical element. Neutral or ionised atoms make up every solid, liquid, gas, and plasma. Atoms typically have a diameter of 100 picometers or less.

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Answer:

As the kinetic energy of the gaseous solute increases, its molecules have a greater tendency to escape the attraction of the solvent molecules and return back to the gas phase. As a result, the solubility of a gas decreases as the temperature increases.

Explanation:

Answer:

14.25

Explanation:

95% of 15

=14.25

0.24 g of LiOH are needed to make 100 ml of a 0.1 m solution.

Lithium hydroxide (LiOH), commonly obtained by the reaction of lithium carbonate with lime, is used in making lithium salts (soaps) of stearic and other fatty acids; these soaps are widely used as thickeners in lubricating greases.

Lithium hydroxide is an inorganic compound with the formula LiOH. It can exist as anhydrous or hydrated, and both forms are white hygroscopic solids. They are soluble in water and slightly soluble in ethanol. Both are available commercially.

LiOH (Lithium hydroxide) is a base. It is because it releases OH– (hydroxide-ion) in water. According to theories, a substance that can accept a proton or donate electrons or react with acid is classified as a base. LiOH reacts with strong acid HCl that produce LiCl and water.

The molarity of LiOH is 0.1M

The given volume is,

M = W1 × 1000/m1 × V(ml)

m1 = molecular mass of LiOH = 24

putting the values in the previous equation,

0.1 = W1 × 1000/24 × 100

W1 = 0.1 × 24 ×100/1000

⇒ 0.24 grams of LiOH is required.

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A spectrophotometer measures the number of photons emitted to estimate the intensity of light spectra absorbed and transmitted by a sample.

A spectrophotometer is an instrument that measures the amount of photons absorbed after it passes via sample solution. With the spectrophotometer, the amount of a recognized chemical substance can also be decided by measuring the depth of light detected.

A spectrophotometer measures the wide variety of photons emitted to estimate the depth of mild spectra absorbed and transmitted by a pattern. This affords facts on the quantity of a compound in the pattern.

A spectrophotometer is an tool that measures color through shining a beam of light and capturing the amount of mild that reflects again or transmits thru to quantify coloration. Spectrophotometers can offer color information for just about any pattern, inclusive of liquids, plastics, paper, metallic, material, and painted samples.

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As long as the sample has the same number of atoms for both elements, the mass ratio is independent of the sample size.

The arithmetic mean is calculated by adding a set of numbers, dividing by their count, and then taking the result. The molecular masses of different substances vary. Therefore, variable numbers of atoms, molecules, or moles exist in masses of equal mass. On the other hand, equal quantities of moles of different substances have different masses. The result will be disproportionately impacted by the one data point if you attempt to calculate an "average of averages". In essence, the value of the average of 10,000 data points is the same as that of the average of a single data point.

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Answer:

C. It does not emit electromagnetic radiation.

Explanation:

Right now, Dark Matter is only a theory. Scientist proposed this to counter some of the strange phenomenon with matter in space.

Scientists know little about dark matter. Some say it's one of the driving forces of the universe. Currently, scientists have no way of measuring or identifying dark matter.

The number of grams of Na₂CO₃ required to neutralize 30 ml of 0.05 N HCl is 1.05 g.

The equation for the neutralization reaction between Na₂CO₃ and HCl is given as follows;

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂

The molarity of HCl is given as 0.05 N and the volume of HCl used is 30 ml, which is equal to 0.03 L. Therefore, the number of moles of HCl used is given as follows;

The number of moles of HCl = Molarity × Volume = 0.05 N × 0.03 L = 0.0015 mol

Using the equation above, it can be seen that one mole of Na₂CO₃ reacts with two moles of HCl. Therefore, the number of moles of Na₂CO₃ required is;

A number of moles of Na₂CO₃ = 0.0015 mol ÷ 2 = 0.00075 mol

The molar mass of Na₂CO₃ is given as 106 g/mol.

Therefore, the number of grams of Na₂CO₃ required is;

Mass of Na2CO3 = Number of moles of Na2CO3 × Molar mass

Mass of Na2CO3 = 0.00075 mol × 106 g/mol = 0.0795 g ≈ 1.05 g.

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Answer:

Preparation and Standardization of 0.1 M Ferrous Ammonium...

Dissolve 40 g of ferrous ammonium sulfate in a previously cooled mixture of 40 ml of sulphuric acid and 200 ml of water.

Dilute with sufficient freshly boiled and cooled water to produce 1000 ml.

Standardize the solution in the following manner.

Explanation:

Answer:

2.5M

Explanation:

Molarity is the measure of the molar concentration of a solution. It is calculated using the formula below:

Molarity = n/V

Where;

n = number of moles (mol)

V = volume (L)

According to the information about Calcium chloride (CaCl2) provided in this question;

n = 0.5moles

M = 0.20M

Molarity = 0.5/0.2

Molarity = 2.5M

Answer:

when the atom is neutral

Explanation:

The molecular equation shows the overall chemical reaction, the complete ionic equation shows the species in their ionic form, and the net ionic equation shows only the species that participate in the reaction.

When calcium metal is added to hydrochloric acid solution, a reaction takes place and calcium chloride and hydrogen gas are produced. The chemical equation for this reaction is:
Ca (s) + 2HCl (aq) → CaCl₂ (aq) + H₂ (g)

The molecular equation shows all the reactants and products in their undissociated form:
Ca (s) + 2HCl (aq) → CaCl₂ (aq) + H₂ (g)

The complete ionic equation shows all the reactants and products in their ionic form, including the spectator ions:
Ca (s) + 2H⁺ (aq) + 2Cl⁻ (aq) → Ca²⁺ (aq) + 2Cl⁻ (aq) + H₂ (g)

The net ionic equation shows only the species that are involved in the chemical reaction, leaving out the spectator ions:
Ca (s) + 2H⁺ (aq) → Ca²⁺ (aq) + H₂ (g)

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Because it provides a very high concentration compared to what is possible with saline.

A high chloride ion concentration shifts the equilibrium position to the right due to Le Chatelier's principle.

Uses of HCL -

Hydrogen chloride is produced when many plastics are burned. Acute (short-term) inhalation exposure in humans can cause eye, nose, and respiratory tract irritation and inflammation, and pulmonary edema.

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For every iodate ion consumed by the reaction with iodine and acid, only 3 thiosulfate ions are consumed by reaction with iodine.

For every iodate ion consumed by the reaction with iodine and acid, 3 thiosulfate ions are consumed by reaction with iodine. This is because the balanced chemical equation for the reaction between iodate and thiosulfate is:
IO₃⁻ + 6S2O₃²⁻ + 6H+ → I⁻ + 3S₄O₆²⁻ + 3H₂O
As you can see, for every iodate ion (IO3-) consumed, 6 thiosulfate ions (S₂O₃²⁻) are consumed. However, in the reaction between iodine and thiosulfate, each molecule of thiosulfate (S₂O₃²⁻) can only react with one molecule of iodine (I2) according to the following balanced chemical equation:
2S₂O₃²⁻ + I2 → S₄O₆²⁻+ 2I⁻
Therefore, for every iodate ion consumed by the reaction with iodine and acid, only 3 thiosulfate ions are consumed by reaction with iodine.

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Explanation:

To find the freezing point of the solution, we can use the freezing point depression equation:

ΔT = Kᵣ x m

Where ΔT is the change in freezing point, Kᵣ is the freezing point depression constant of benzene, and m is the molality of the solution.

Substituting the values from the problem, we get:

ΔT = 5.12 °C/m x 2.8 m

ΔT = 14.34 °C

Since ΔT = Tᵢ - T, where Tᵢ is the freezing point of the solvent (benzene) and T is the freezing point of the solution, we can rearrange the equation to solve for T:

T = Tᵢ - ΔT

T = 5.50 °C - 14.34 °C

T = -8.84 °C

Therefore, the freezing point of the solution is -8.84 °C.

Answer:The freezing point of the solution is -8.84 °C.

Explanation:

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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Answer:

because the boiling point of water is 100°C the water bath would boil before the substance

By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

Your approach is incorrect because it does not consider all possible arrangements that satisfy the given conditions. Let's analyze your approach step by step.

You correctly start by seating one biologist, which can be done in 1 way. However, when you proceed to seat the second biologist, you assume that there are 3 choices. This is where the error occurs.

Consider the following possibilities:

If the first biologist is seated at Chair 1, the second biologist cannot be seated at Chair 2 or Chair 6, as they would be sitting next to each other. Therefore, the second biologist can only be seated at Chair 4.

If the first biologist is seated at Chair 2, the second biologist can only be seated at Chair 5.

If the first biologist is seated at Chair 3, the second biologist can only be seated at Chair 6 or Chair 1.

If the first biologist is seated at Chair 4, the second biologist can only be seated at Chair 1.

If the first biologist is seated at Chair 5, the second biologist can only be seated at Chair 2.

If the first biologist is seated at Chair 6, the second biologist can only be seated at Chair 3.

So, there are actually 6 different arrangements for seating the two biologists.

Now, if we continue with your approach, seating the chemists and physicists, we need to consider the additional possibilities that arise due to the constraints of the biologist's seating arrangements.

Therefore, the correct approach would involve considering all possible arrangements that satisfy the given conditions. By taking into account the different seating possibilities for the biologists, chemists, and physicists, you will find that the total number of valid seating arrangements is indeed 32.

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Answer:

tangol is Ca Li -56-(99)

The statement that would best explain the observation of no liquid being evident in the sealed bottle is: b. Liquid and vapor are at equilibrium in the bottle.

When liquid and vapor are at equilibrium in a closed system, it means that the rate of condensation (liquid turning into vapor) is equal to the rate of vaporization (vapor turning into liquid). In this case, it appears that all the liquid has vaporized, and no liquid is evident. This suggests that the liquid and vapor have reached a state of equilibrium, where the amount of liquid remaining is negligible compared to the amount of vapor present.

The vapor state is favored when equilibrium is established because the pressure exerted by the vapor phase reaches a point where it equals the vapor pressure of the liquid at that temperature. At this equilibrium point, no further net condensation or vaporization occurs, resulting in the absence of visible liquid in the sealed bottle.


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