Which of the following substances has the highest boiling point

A. Br2

B. C2H5OH

C. C2H5SH

D. C2H6

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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dolphin and whales use echolocation

Writing and balancing complex half-reactions in acidic solutions involves a systematic approach. Here are the general steps to follow:

Identify the oxidation and reduction half-reactions: Determine which species is being oxidized (losing electrons) and which is being reduced (gaining electrons).

Balance the atoms: Begin by balancing all atoms except hydrogen and oxygen in each half-reaction.

Balance the charges: Add electrons (e-) to one side of each half-reaction to balance the charges.

Balance the oxygen atoms: Add water (H2O) to the side of the equation that lacks oxygen atoms.

Balance the hydrogen atoms: Add hydrogen ions (H+) to the side of the equation that lacks hydrogen atoms. Keep in mind that the solution is acidic.

Balance the charges: Adjust the number of electrons (e-) on each side of the equation to ensure that the charges are balanced.

Multiply the half-reactions: Multiply each half-reaction by an appropriate factor so that the number of electrons gained and lost are equal.

Combine the half-reactions: Add the two balanced half-reactions together and cancel out common terms on both sides of the equation.

By following these steps, you can effectively write and balance complex half-reactions in acidic solutions, ensuring that the overall reaction is balanced in terms of both atoms and charges.

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Answer:

neap tide

Explanation:

There are two different types of tides, which are the spring tide and the neap tide.

Neap tides are weak tides which occur when the gravitational forces of the sun and the moon are at right angles to each other with respect to the earth. Since the sun and moon are at right angles, it causes a difference between the low and high tide.

The spring tide are strong tides which occur when the moon, sun and earth are in straight line. The spring tide occur during full moon and new moon.

Answer:

Neap Tides  

The result is a neap tide. The same effect happens during third quarter. These occur during first and last quarter moons. The gravitational pull is not as strong.

Explanation:

the first answer is correct

Atoms of the same elements differing in the number of neutrons in their nuclei are known as isotopes. Thus, isotopes of an element have the same atomic number but different atomic mass number. Isotopes of an element have similar chemical properties but different physical properties.

Answer:

In an electrical room in A factory.

Explanation:

When you step on the scale, you might see a reading of 160 lbs, but in actuality, you might weigh 160.11111 pounds, that would be challenging to determine with a standard bathroom scale.

Describe scale.

 A fish's external body covering, specifically, consists of a tiny, flattened, stiff, and unmistakably delimited plate. B: A tiny, thin plate with mica scales that resemble the scales of a moth's wing.

A little weighing scale – what is it?

It is a compact weighing scale with an easy-to-read digital screen that is portable. It is a compact weighing scale with an easy-to-read computer indicator that is portable. It is a versatile scale that works well for weighing big goods in various locations.

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Answer:

Wave Frequency

Answer:there are four types they are oil,natural gas,coal, and nuclear energy

Explanation:

Answer:

C.

Explanation:

They will need to know the influence of gravitational force on objects because gravity can affect an objects weight.

Answer:

The percentage yield of sodium carbonate is 91.47%

Explanation:

we start by writing the reaction equation:

2NaCl + CaCO3 ——-> Na2CO3 + CaCl2

From the reaction we can see that 2 moles of sodium chloride produced 1 mole of sodium carbonate

Let us calculate the actual number of moles of sodium chloride produced from 112 g of it

Mathematically,

number of moles = mass/molar mass

Molar mass of sodium chloride is 23 + 35.5 = 58.5 g/mole

So the number of moles of sodium chloride produced will be 112/58.5 = 1.91 moles

The number of moles of sodium carbonate produced is half of this = 1.91/2 = 0.955

The mass of sodium carbonate produced from 0.955 moles of it will be;

number of moles * molar mass

The molar mass of sodium carbonate is 106 g/mol

So the number of moles is = 0.955 * 106 = 101.23 g

Mathematically;

percentage yield = actual yield/theoretical yield * 100%

Percentage yield = 92.6/101.23 * 100% = 91.47%

Answer:

Explanation:

1. A mixture of ammonium chloride, sand, and zinc chloride should be separated by sublimation.

2. A mixture of zinc chloride and silver chloride should be separated through crystallization.

A separation technique can be defined as a technique that is typically used to separate or convert two (2) or more mixture and solution of chemical substances into distinct product such as chemical compounds or elements.

In Chemistry, there are various types of separation technique used for the separation of mixtures or solutions and these include:

In this scenario, the most effective and efficient means to separate a mixture of ammonium chloride, sand, and zinc chloride is by sublimation from solid to gas state.

On the other hand, the best means to separate a mixture of zinc chloride and silver chloride is through crystallization.

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Answer:

A

Explanation:

Two specialized cells called 'guard cells' make up each stoma (stoma is singular for stomata). Plants have many stomata up to 400 per mm2 on their leaf surfaces and they are usually on the lower surface to minimize water loss.

Ferrous sulfate (FeSO4) is obtained by the reaction of aqueous ferric sulfate with gaseous sulfur dioxide and water according to the equation below:

Aqueous ferric sulfate = \(Fe_2(SO_4)_3_{(aq)}\)

Gaseous sulfur dioxide = \(SO_2_{(g)}\)

Water = \(H_2O_{(l)}\)

Aqueous sulfuric acid =  \(H_2SO_4_{ (aq)}\)

Aqueous ferrous sulfate =  \(FeSO_4_{ (aq)}\)

Thus, the balance equation becomes:

\(Fe_2(SO_4)_3_{(aq)}\) +  \(SO_2_{(g)}\) + \(2H_2O_{(l)}\) \(--->\) \(2 H_2SO_4_{ (aq)} + 2 FeSO_4_{ (aq)}\)

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a. acceleration

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Answer: .39 Moles would be needed.

Explanation: The mole-to-mole ratio of Copper (ll) chloride to Al is 3/2. We can tell by looking at the coefficients of the reactants. Al has a coefficient of 2 and CuCl2 has a coefficient of 3. The ratio of CuCl2 to Al is 3:2 or 3/2. We multiply this ratio by the number of moles of Al which .26 to find how much we need of CuCl2. Now figure out how many moles of AlCl3 you would produce from .26 moles of Al.

A chemical equation is known to be balanced if the total number of moles of elements at the reactant is equal to that of the product.

For the reaction between sodium chloride (NaCl) and potassium nitrate (KNO₃), the balanced reaction is given as;

You can see that the reactant ions exchange places to form new products (potassium chloride and sodium nitrate). This shows that the equation is a double displacement reaction

The number of moles of the water that was evaporated is  12083467.5 moles of water.

We know that the number of moles that we have can be gotten as the ratio of the mass to the number of moles of the object. Now we know that from the question, we have the volume of the hydrogen to be 90,000 gallons. We have to convert this volume to liters.

Given that;

1 gallon = 3.79 L

90,000 gallons  = 90,000 gallons  * 3.79 L/1 gallon

= 341100 L

Then we have the density of the hydrogen to be 70.85 g/L

Mass of the hydrogen =  70.85 g/L *  341100 L

= 24166935 g

Number of moles of the hydrogen reacted = 24166935 g/2 g/mol

= 12083467.5 moles

If 2 mole of hydrogen gives 2 moles of water

12083467.5 moles of hydrogen gives 12083467.5 moles of water

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Answer:

1.natural 2.weathering 3.soil

The function of the magnet in Nuclear Magnetic Resonance (NMR) spectroscopy is to generate a strong, uniform magnetic field that aligns the nuclear spins of the sample being analyzed. This alignment allows for the detection and measurement of the interaction between the nuclear spins and an applied radiofrequency pulse.

In NMR spectroscopy, the magnet creates a static magnetic field (B0), which causes the nuclear spins of atoms with a magnetic moment, such as 1H and 13C, to align either parallel or anti-parallel to the field. The energy difference between these two alignments is proportional to the strength of the magnetic field, and results in distinct resonance frequencies for each nucleus.

When a radiofrequency (RF) pulse is applied at the appropriate frequency, it excites the nuclear spins, causing them to flip between the two energy states. After the pulse, the spins return to their equilibrium state, and the process of relaxation emits a detectable signal. This signal, called Free Induction Decay (FID), contains information about the chemical environment of the nuclei, which can be analyzed to provide insights into molecular structure and dynamics.

The quality and resolution of NMR spectra depend on the uniformity and stability of the magnetic field, which is why high-quality magnets, such as superconducting magnets, are essential in NMR spectroscopy. These magnets provide strong, stable magnetic fields that enable the accurate analysis of complex molecular systems.

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Answer:

Explanation:

To find the concentration of a solution, we need to divide the number of moles of solute by the volume of the solution in liters.

In this case, we have 0.50 mol of NaCl dissolved in 0.30 L of solution. Therefore, the concentration of the solution can be calculated as:

Concentration = moles of solute / volume of solution

Concentration = 0.50 mol / 0.30 L

Concentration = 1.67 mol/L

Therefore, the concentration of the solution is 1.67 mol/L.

Answer:

C. Products have higher potential energy, and the reaction is endothermic.

Answer:

\(m_{O_2}=120gO_2\)

Explanation:

Hello!

In this case, since the decomposition of potassium chlorate is:

\(2KClO_3\rightarrow 2KCl+3O_2\)

We can see a 2:3 mole ratio between potassium chlorate and oxygen (molar mass 32.0 g/mol), thus, via stoichiometry, we compute the mass of oxygen that are produced by the decomposition of 2.50 moles of this reactant:

\(m_{O_2}=2.50molKClO_3*\frac{3molO_2}{2molKClO_3} *\frac{32.0gO_2}{1molO_2}\\\\m_{O_2}=120gO_2\)

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Answer:

liquid cooling.

Explanation:

Remember that entropy can be interpreted as the degree of disorder or randomness in the system.

When we're releasing energy in form of heat in a spontaneous reaction (endothermic process), the entropy is increasing.

In a nonspontaneous reaction, we require energy from an external source (endothermic process), in this case, the entropy decreases.

Based on this logic, when we want to cool a liquid, we require energy to do it, so the entropy, in this case, decreases. The answer would be liquid cooling.

Answer:

An atomic element is an element which exists independently as atoms and can still react with other elements forming a compound

Answer:

1.400 mol

Explanation:

To convert grams to moles, you will need the molar mass.  The molar mass of iron(iii) sulfate is 399.88 g/mol.  Divide grams by the molar mass to find moles.

(560.0 g)/(399.88 g/mol) = 1.400 mol

There are 1.400 mol present in 560.0 g of iron(iii) sulfate.