Splitting of a signal in a proton NMR spectrum tells us the number of chemically non-equivalent hydrogens in the immediate vicinity of the hydrogen giving the signal.

a. True
b. False

One liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is hydrochloric acid (HCl). Hydrochloric acid is a strong acid commonly used in laboratories for various purposes, including cleaning and dissolving mineral deposits.

When dry mortar, which is primarily composed of cement, hardens on floor tiles, it can be challenging to remove using traditional cleaning methods. However, hydrochloric acid can effectively dissolve and break down the cementitious components of the mortar.

It is important to note that when using hydrochloric acid, proper safety precautions should be followed, such as wearing protective gloves, goggles, and working in a well-ventilated area.

Additionally, it is crucial to dilute the hydrochloric acid to an appropriate concentration for the specific task, as using it undiluted can cause damage to the tiles or other surfaces.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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The volume of water needed to prepare the solution given the data is 2.16 L

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = mass / molar mass

Mole of CaCO₃ = 756 / 100.1

Mole of CaCO₃ = 7.55 moles

Volume = mole / molarity

Volume = 7.55 / 3.5

Volume = 2.16 L

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Answer:

Wind and Hydroelectricity can be considered forms of solar energy.

Explanation:

Wind power is a form of solar energy because winds are caused by the heating of the atmosphere by the sun, the rotation of the Earth, and the Earth's surface irregularities. For as long as the sun shines and the wind blows, the energy produced can be harnessed to send power across the grid.

Hydroelectricity is a form of solar energy because Hydropower relies on the water cycle.

The water cycle has three steps:

Solar energy heats water on the surface of rivers, lakes, and oceans, which causes the water to evaporate.

Water vapor condenses into clouds and falls as precipitation—rain and snow.

Precipitation collects in streams and rivers, which empty into oceans and lakes, where it evaporates and begins the cycle again.

Answer:

0.050 mol

Explanation:

The reaction that takes place is:

Then we convert 0.050 moles of phosphoric acid into moles of ammonium phosphate, using the stoichiometric coefficients of the reaction:

Thus, the complete reaction of 0.050 moles of phosphoric acid would produce 0.050 moles of ammonium phosphate.

Answer:

Q = 360 Joules

Explanation:

specific heat of copper = 0.400 J/g° C

mass of copper = 30 g

initial temperature = 20.0°C

final temperature = 50.0°C

Using the formula:

Q = mcΔT

where;

Q = Heat Energy

\(Q = m*c * (T_2-T_1)\)

Q = (30 × 0.400)(50-20)

Q = 360 Joules

A thermochemical equation can be written by expressing the heat evolved or absorbed in terms of the enthalpy change ΔH. Here ΔH for the following reaction +88.2 kJ. The correct option is A.

A chemical equation which indicates the heat change occuring during the reaction is defined as the thermochemical equation. In thermochemical equations, physical states of the reactants and products should be specified.

Here the given reaction 4 AlCl₃ (s) + 3 O₂ (g) ⇒ 2 Al₂O₃ (s) + 6 Cl₂ (g) is reversed as 1 /3 Al₂O₃ (s) + Cl₂ (g) ⇒ 2/3 AlCl₃ (s) + 1/2 O₂ (g) and multiplied by 1/6.

So the new enthalpy is +88.16 ≈ 88.2 kJ

Thus the correct option is A.

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Answer:

10.5 × 10^5 M

Explanation:

E°cell = E°cathode - E°anode

E°cell = 0.85 - (-0.74) = 1.59 V

From Nernst's equation;

Ecell = E°cell - 0.0592/n log Q

1.499 = 1.59 - 0.0592/6 log [Cr^3+]/6.35x10^-4

1.499 - 1.59 = - 0.0592/6 log [Cr^3+]/6.35x10^-4

-0.091 = -0.00987 log [Cr^3+]/6.35x10^-4

-0.091/ -0.00987 = log [Cr^3+]/6.35x10^-4

9.22 = log [Cr^3+]/6.35x10^-4

Antilog (9.22) = [Cr^3+]/6.35x10^-4

1.66 × 10^9 = [Cr^3+]/6.35x10^-4

[Cr^3+] = 1.66 × 10^9 × 6.35x10^-4

[Cr^3+] = 10.5 × 10^5 M

Answer:

The waves travel in a direction parallel to direction of the vibration of the medium

The waves travel in a direction parallel to direction of the vibration of the medium

A mechanical wave is defined as an oscillation of matter which is responsible for energy transfer via  medium.

The propagation of  wave is limited by the medium of transmission, the oscillating material which revolve around a fixed point with little translational motion.

A surface wave which is an example of  mechanical wave that propagate  along the interface of two different media in physics. other common examples are Gravity waves on the surface of liquids, ocean waves.

Surface wave can be propagated in a slow way through Earth material and are generally lower in frequency than body waves.

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Answer: One carbon atom can make a maximum of 4 covalent bonds. The best option to answer the question is number 4.

Explanation:

The question requires us to choose, among the options given, which one corresponds to the maximum number of carbon bonds that can be formed by one carbon atom.

To answer this question, we can consider the electronic configuration of a carbon atom. Carbon (C) presents atomic number 6, therefore it contains 6 electrons and its electronic configuration can be written as:

Note that there are 4 electrons in carbon's valence shell (2s2 and 2p2), thus a carbon atom needs additional 4 electrons to achieve stability.

If the atom needs 4 electrons to achieve stability, it means it can make 4 covalent bonds to "acquire" these electrons.

Therefore, the best option to answer the question is number 4.

Answer:

Explanation:

If a zero is found between significant digits, it is significant

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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The highlighted apparatus are;

1) stirring rod

2) crucible

The term chemical reaction refers to the process by which two or more substances are combined to form a product. The product may look like or different from the reactants that were combined to produce it.

Now we can see the set up that was used as shown for the reaction of  dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate.

The highlighted apparatus are;

1) stirring rod

2) crucible

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Answer:

187.3mL of 2.65M KOH you must add

Explanation:

The pH of the buffer of acetic acid is obtained as follows:

pH = pKa + log [Acetate] / [Acetic Acid]

Where [] could be moles of acetate and acetic acid

Replacing:

5.24 = 4.76 + log [Acetate] / [Acetic Acid]

0.48 = log [Acetate] / [Acetic Acid]

3.01995 = [Acetate] / [Acetic Acid](1)

As concentration of acetic acid is 0.796M and volume is 830mL, the moles of acetic buffer is:

0.830L * (0.796 moles / L) = 0.6607 moles

Thus:

0.6607 moles = [Acetate] + [Acetic Acid] (2)

Replacing (2) in (1):

3.01995 = 0.6607 moles - [Acetic Acid] / [Acetic Acid]

3.01995 [Acetic Acid] = 0.6607 moles - [Acetic Acid]

4.01995 [Acetic Acid] = 0.6607 moles

[Acetic Acid] = 0.16435 moles

[Acetate] = 0.6607 moles - 0.16435 moles = 0.49635 moles

The reaction of acetic acid with KOH to produce Acetate is:

Acetic acid + KOH → Acetate + Water

That means the moles of KOH you add, are the moles of acetate.

To add 0.49635 moles of 2.65M of KOH you need:

0.49635 moles * (1L / 2.65 moles) = 0.1873L =

There are eight bonding electrons and one non-bonding pair of electrons across the Se atom. The Lewis structure is, for this reason, a legitimate Lewis structure of SeF4 S e F four can't be drawn without violating the octet policies.

Lewis structures, additionally called Lewis dot formulas, Lewis dot systems, electron dot structures, or Lewis electron dot systems, are diagrams that show the bonding among atoms of a molecule, in addition to the lone pairs of electrons that can exist within the molecule.

The Lewis structures became named after Gilbert N. Lewis, who added it in his 1916 article The Atom and the Molecule. Lewis structures extend the idea of the electron dot diagram by way of including lines between atoms to represent shared pairs in a chemical bond.

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Answer:

the density is 6

Explanation:

mass divided by volume equals density

Answer:

orbital shape.

Explanation:

1) There are four quantum numbers to describe the electrons. These are:

i) Principal quantum number (n)

ii) Azimuthal quantum number (ℓ), also called angular momentum quantum number.

iii) Magnetic quantum number (m)

iv) Spin quantum number (s)

2) The principal quantum number tells the main energy level. It can be 1, 2, 3, 4, 5, 6, 7. It is related to the orbital size. 1 is a small orbital, 7 is a big orbital.

2) The Azimuthal quantum number (ℓ) or angular momentum quantum number may be a number between 0 and n - 1.

It tells the kind of orbital, which is its shape

The correspondence is:

0 = s orbital,

1 = p orbital,

2 = d orbital,

3 = f orbital.

3) Magnetic quantum number (m) tells the orientation. It can be from - ℓ to + ℓ

For example when ℓ = 1, the orbital is p, and the magnetic quantum number may be -1, 0, or +1, which corresponds to px, py, pz: the orientation of the p orbital in the space.

4) Spin quantum number (s) can be either +1/2 or -1/2.

JM~ Hope this helps you out

Answer:

As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption

The table shows a list of different substances and their corresponding specific heat.

The specific heat is defined as the quantity of energy required to raise the temperature of 1 gram of a substance by 1°C.

As we can see in this table, the substance that has the highest specific heat of this group is water, with the value 4.18 J/g°C. This means that in order to increase the temperature of 1g of water by 1°C it is needed 4.18 joules.

The answer is then:

The substance that absorbs more energy to increase in temperature by 1°C is water.

Answer:

B.0.558M

Explanation:

M=n/L

n=m/Mm

Mm=NaOH

=23+16+1

=40g/mol

n=m/Mm

= 38/40

=0.95

M=n/L

=0.95/1.70

=0.558

Answer:

B i think

Explanation:

Answer:

A

Explanation:

The moon cycle goes from right to left

Answer:

me too

Explanation:

According to the question for a solution with a pH of 2.68, [H+] = 10-2.68 = 0.00145 M.

pH is a measure of the acidity or alkalinity of a solution. It is measured on a scale of 0 to 14, with 0 being the most acidic, 7 being neutral, and 14 being the most alkaline. The pH of a solution is determined by the amount of hydrogen ions present in the solution. Solutions with a higher concentration of hydrogen ions are more acidic, while solutions with a lower concentration of hydrogen ions are more alkaline. pH is an important factor in determining the solubility of substances, as well as the rate of chemical reactions. It is also important in controlling the growth of microorganisms, as some organisms require a certain pH to survive.

The [H+] concentration can be determined by using the pH equation, which states that pH = -log[H+]. Rearranging this equation to solve for [H+], we get [H+] = 10-pH.
Therefore, for a solution with a pH of 2.68, [H+] = 10-2.68 = 0.00145 M.

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Answer:

see in your book properly

A dam constructed to produce tidal power does so by harnessing water flow to drive turbines and electric generators .

Tidal energy was employed in grain mills to crush grains mechanically, just like wind energy was. grain crushing Here, the tidal energy generated by the turbines was used. Hydroelectric dams, which serve as significant energy storage, also employ tidal energy to store energy.

Tidal power can harm marine life because tidal turbines' whirling blades can cause marine organisms to perish. Fish habitations in tidal power settings may be impacted by noise from the turbines' rotation. Tidal energy can also affect how sediment and water are processed.

Therefore, option B is correct.

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Answer:

19. C 20. A 21. H 22. G 23. D 24. F 25. B 26. E

Explanation:

Just learnt it in science class