Which solid has the highest melting point? why? c(s, diamond), kr(s), nacl(s), h2o(s

I'm hoping the same for my new coaching classes

This is my first time going out to study ngl-

Answer:element x

Explanation:because element x is shiny and hard and that's a property of metals and metals are good conductors of heat and electricity

The order for mass is atom, molecule, mole, gram.  In current physics, mass has several meanings that are theoretically distinct but physically equal.

A body's mass is an inherent attribute. Till the discovery of the atom as well as particle physics, it was thought to be tied to the amount of matter inside a physical body.

It was discovered that although having the same quantity of stuff, various atoms and fundamental particles had varying masses. In current physics, mass has several meanings that are theoretically distinct but physically equal. The order for mass is atom, molecule, mole, gram.

Therefore, the order for mass is atom, molecule, mole, gram.

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The correct alternatives of the blanks are -

Blank 1 - Gases.

Blank 2 - Liquid.

We have a statement regarding the supercritical fluid.

We have to fill in the blanks with correct alternatives.

A supercritical fluid is any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist.

According to the question -

The complete statement regarding the supercritical fluid is as follows -

A supercritical fluid can expand like a gases to fill a container and has a density similar to that of a liquid so can behave as a solvent.

Hence, the correct alternatives of the blanks are -

Blank 1 - Gases.

Blank 2 - Liquid.

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When a ground state hydrogen atom absorbs a photon of light having a wavelength of 92.6 nm, the final state of the hydrogen atom is the excited state.

The hydrogen atom has only one electron, which is located in the ground state or the first energy level. When a photon of light of 92.6 nm wavelength is absorbed, the electron gains energy and jumps to the higher energy level, which is the second energy level (n = 2).

Thus, the final state of the hydrogen atom is the excited state or the second energy level. The energy absorbed by the electron is equal to the energy of the photon. The energy of a photon is given by the formula: Energy of a photon = hc/λwhere,h = Planck's constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s λ = wavelength of the photon

Substituting the given values, we get

Energy of a photon = (6.626 x 10⁻³⁴ J.s x 3 x 10⁸ m/s) / (92.6 x 10⁻⁹ m)

Energy of a photon = 2.14 x 10⁻¹⁸ J. The energy absorbed by the electron is equal to the energy difference between the two energy levels.

The energy of an electron in the nth energy level of the hydrogen atom is given by the formula: E_n = (-2.18 x 10⁻¹⁸ J) / n² where, E_n = energy of electron in nth energy level

Substituting n = 1 (ground state), we get: E₁ = (-2.18 x 10⁻¹⁸ J) / (1)²   E₁= -2.18 x 10⁻¹⁸ J

Substituting n = 2 (excited state), we get: E₂ = (-2.18 x 10⁻¹⁸ J) / (2)²  E₂ = -0.545 x 10⁻¹⁸ J

The energy absorbed by the electron is the difference between the energy of the electron in the excited state and the energy of the electron in the ground state.

ΔE = E₂ - E₁

ΔE = (-0.545 x 10⁻¹⁸ J) - (-2.18 x 10⁻¹⁸ J)ΔE = 1.64 x 10⁻¹⁸ J

Since the electron gains energy, the energy absorbed by the electron is positive. Therefore, the final state of the hydrogen atom is the excited state.

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Answer:

Properties: The melting point of phosphorus (white) is 44.1°C, boiling point (white) is 280°C, specific gravity (white) is 1.82, (red) 2.20, (black) 2.25-2.69, with a valence of 3 or 5. There are four allotropic forms of phosphorus: two forms of white (or yellow), red, and black (or violet).Oct 7, 2019

Atomic Number: 15

Atomic Weight: 30.973762

Explanation:

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Answer:

Properties: The melting point of phosphorus

Atomic Number: 15

Atomic Weight: 30.973762

Discovery: Hennig Brand, 1669 (Germany)

Answer:

It means an equal volume of both the solvent & the solute

Explanation:

To prepare a buffer with a pH of 3.52, the appropriate choice would be Butyric acid (pKa = 4.82).  The correct option is D.

In a buffer solution, the acid and its conjugate base work together to resist changes in pH upon addition of acid or base. Since the desired pH is lower than the pKa value of Butyric acid, it indicates that the acid will be predominantly in its undissociated form and can act as an effective buffer.

Hydrocyanic acid and Hypoiodous acid have pKa values higher than the desired pH, making them unsuitable choices for preparing a buffer with a pH of 3.52. Citric acid has a pKa value of 3.13, which is close to the desired pH, but Butyric acid is a better choice as its pKa is closer to the target pH.

The correct option for preparing a buffer with a pH of 3.52 is option D: Butyric acid (pKa = 4.82).

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A buffer solution with a pH of 3.52 would require an acid with a pKa close to this value. Therefore, the appropriate acid to use to prepare the buffer would be Butyric acid (pKa=4.82).

Buffer solution: A buffer solution is a solution that can resist a change in pH when a small amount of acid or base is added to it. The pH of the buffer solution changes by a small amount when a small amount of acid or base is added to it because it contains both a weak acid and its conjugate base. pH is the measure of how acidic or basic a solution is. The pH scale ranges from 0 to 14. A solution with a pH less than 7 is acidic, while one with a pH greater than 7 is basic. A solution with a pH of 7 is neutral. Acids are substances that contribute hydrogen ions (H+) to a solution and have a pH of less than 7. Bases are substances that contribute hydroxide ions (OH-) to a solution and have a pH greater than 7.pKa valueA pKa value is a measure of the acidity of a molecule. It represents the pH at which the molecule is half-protonated and half-deprotonated. The lower the pKa value, the stronger the acid. An acid with a pKa value close to the pH of the buffer solution will be a suitable candidate for making the buffer solution. A buffer with a pH of 3.52 would require an acid with a pKa close to this value.

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Answer:

Gamma, Infrared,microwave,Radio, visible, ultraviolet,X-ray

Ranking these parts of electromagnetic spectrum from lowest energy to highest energy is as follows ;

The longer the wavelength of a section of the EM spectrum the lower the energy carried while the shorter the wavelength and more the energy the electromagnetic wave will contain.

Hence ranking the electromagnetic waves in the electromagnetic spectrum from the lowest energy to the highest energy is ; Radio, Microwaves, Infrared, Visible, Ultraviolet, X-ray, Gamma waves.

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Electrical energy is changed into mechanical energy which takes place when the cook uses the blender. So, the correct option is B.

Electrical energy is defined as the energy related to the forces on electrically-charged particles and the motion of those particles whose energy is supplied by a combination of current and electric potential that is delivered by a circuit.

Electrical energy is present all around us in many different forms, where some of the best examples of electrical energy are using car battery electrical energy in electrical systems, wall outlet to transfer electrical energy to charge our phones, and our muscles that uses electrical energy to contract and relax. Electrical energy is changed into mechanical energy which takes place when the cook uses the blender.

Therefore, the correct option is B.

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The property that causes the zinc shavings to react faster than the chunk of zinc is called the surface area.

When performing any type of chemical reaction, the surface area is an important aspect to take into account because it significantly affects the reaction's rate. The rate of reaction increases with decreasing surface area.

When compared to zinc shavings, which have been broken down into zinc particles with smaller surface areas, a chunk of zinc is similar to a body of stone held together by strong bonding.

In comparison to the huge chunk of zinc, the reactive surface area of the zinc shavings is smaller. Reactants' lower surface areas make it necessary for them to be in close contact with the acid solution for the reaction to occur.

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As the axonal membrane repolarizes during the falling phase of an action potential, the driving force on K+ ions changes from large to small.

During the falling phase of an action potential, the axonal membrane undergoes repolarization. This involves the restoration of the membrane potential from its positive peak back to the resting potential. The repolarization is primarily driven by the efflux of positively charged potassium ions (K+) out of the cell.

At the peak of the action potential, the membrane potential is positive, and the concentration of K+ ions inside the cell is relatively high compared to the outside. This creates a large electrochemical gradient and driving force for K+ ions to move out of the cell.

However, as repolarization progresses, the membrane potential becomes more negative, approaching the resting potential. As a result, the electrical gradient for K+ ions decreases, and the driving force on K+ ions becomes smaller. This decrease in driving force is due to the decreasing difference in charge across the membrane.

Ultimately, the driving force on K+ ions changes from large to small during the falling phase of an action potential as the axonal membrane repolarizes.

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Answer:

2.It is released to the surroundings.

Explanation:

In an exothermic reaction, the energy released is to the environment. At the end of the reaction, the surrounding becomes hotter than the system where the reaction is taking place.

Answer:

Glucose is the carbohydrate produced by photosynthesis. Energy-rich glucose is delivered through your blood to each of your cells. ATP is the usable form of energy for your cells.

Explanation:

In order to demonstrate that intramolecular forces are stronger than intermolecular forces, a block of ice will be heated in a sealed container until it turns into steam.

Because the forces holding together compounds are stronger than the forces holding together molecules, intramolecular forces are stronger than intermolecular forces.

Intermolecular forces exist between molecules, but intramolecular forces exist between atoms within a molecule. This is the primary distinction between intermolecular and intramolecular forces.

Look for the molecule with the most polarity, the most electronegative atoms, or the most hydrogen bonding groups if the molecules have identical molar weights and similar intermolecular forces. That one will have the overall stronger IMFs.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

tty to fin out what happend by redoing it

Answer:

Bro its expired milk duh

Explanation:

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Answer:

Chemistry

Explanation:

The pair that cannot be mixed together to form a buffer solution is:

RBOH and HBr

In order to form a buffer solution, we need a weak acid and its corresponding conjugate base or a weak base and its corresponding conjugate acid. The pair of substances should be able to resist changes in pH upon addition of small amounts of an acid or a base.

Out of the given pairs, the first four pairs can form buffer solutions:

- NH3 and NH4Cl can form a buffer solution as NH3 is a weak base and NH4+ is its corresponding conjugate acid.

- KOH and HF cannot form a buffer solution as KOH is a strong base and HF is a weak acid.

- NaCH3COO and HCl can form a buffer solution as CH3COO- is a weak base and CH3COOH is its corresponding conjugate acid.

- H3PO4 and KH2PO4 can form a buffer solution as H2PO4- is a weak acid and HPO42- is its corresponding conjugate base.

However, RBOH (rubidium hydroxide) is a strong base and HBr (hydrobromic acid) is a strong acid. They cannot form a buffer solution as there is no weak acid or weak base in the pair.

Given the chemist's series of reactions producing binary lithium compounds, it is likely that they are interested in investigating periodic trends of various elements in order to predict their reactivity with lithium.

One hypothesis that the chemist might use could be: "As the atomic radius of an element increases within a period of the periodic table, its reactivity with lithium will decrease." This hypothesis is based on the trend of decreasing electronegativity and increasing metallic character as atomic radius increases within a period. Since lithium is a highly reactive metal, it is likely to form compounds with elements that have high electronegativity and low metallic character. Therefore, if the atomic radius of an element increases, its electronegativity will likely decrease, and its metallic character will likely increase, making it less likely to react with lithium. The chemist could test this hypothesis by performing a series of reactions between lithium and various elements within a period of the periodic table, measuring the resulting compound's properties, and comparing them to the predicted trend. This could help the chemist gain a better understanding of how periodic trends affect the reactivity of elements with lithium, and ultimately inform their future research in this area.

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0.135mole is the number of mole of oxygen that are needed to producce 30 g of ferric oxide. The same amount of gases under identical circumstances ought to have the same amount of molecules.

In chemistry, a mole, usually spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, and other predetermined particles. The same amount of gases under identical circumstances ought to have the same amount of molecules, according to Avogadro's theory, which was successful in calculating atomic therefore molecular weights and gave rise to the idea of the mole.

4 Fe ( s )  + 3 O\(_2\) ( g )  → 2 Fe\(_2\) O\(_3\) ( s)

mole of Fe\(_2\) O\(_3\)  =30 /159.69

                             =0.18mole

According to stoichiometry

mole of oxygen = 0.18×3/4=0.135moles

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Answer: Cobalt

Explanation:

Lead and gold aren't magnetic

Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

Answer: Im not sure but i think its B

Explanation: Its hard to explain so im

not gonna do it

Taking into account the definition of strong acid, pH and pOH, it is obtained that the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

It is called strong acid, that acid that dissociates completely in solution at constant temperature and pressure. Under these conditions, the concentration of a strong acid is equal to the concentration of hydrogen ions (Hydronium or H₃O⁺). In other words, a strong acid is an acid that completely dissociates into hydrogen ions and anions in solution.  

Hydrobromic acid HBr is a strong acid, so a concentration of 0.055 M of the acid generates a H₃O⁺ concentration of the same value. This is:

[HBr]= [H₃O⁺]= 0.055 M= 5.5×10⁻² M

On the other hand, pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance. Mathematically it is calculated as the negative logarithm in base 10 of the activity of hydrogen ions:

pH= -log [H₃O⁺]

Being [H₃O⁺]= 5.5×10⁻² M, the pH in this case is:

pH= -log (5.5×10⁻² M)

Solving:

pH= 1.26

Similarly, pOH is defined as the negative base 10 logarithm of the activity of the OH⁻ ions:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pH + pOH= 14

Then, being pH = 1.26, the pOH is calculated by:

1.26 + pOH= 14

pOH= 14 - 1.26

pOH= 12.74

Replacing in the definition of pOH:

12.74= - log [OH⁻]

and solving you get:

[OH⁻]= 1.82×10⁻¹³ M

Finally, the correct option is option A) [H₃O⁺]= 5.5×10⁻² M, [OH⁻]= 1.82×10⁻¹³ M, pH= 1.26

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Answer:

gonna check them rn :) youre not d u mb dont worry (:

Answer:

Full moon.

Explanation:

This diagram shows a full moon because the sunlight is shining directly onto the side of the moon facing the earth in this instance.

Answer:

It is A

Explanation:

Answer :Phosphorus P 32.6138

Oxygen O 67.3862

Explanation: Phosphorus P 32.6138

Oxygen O 67.3862