calculate the reaction energy Q for the reaction p + 3,1 H --> 2,1 H + 2,1 H . express your answer in megaelectron volts.

Answer:

the heat source for our planet is the sun. Energy from the sun is transferred through space and through the earth's atmosphere to the earth's surface. Since this energy warms the earth's surface and atmosphere, some of it is or becomes heat energy.

Answer:

Soap breaks up the oil into smaller drops, which can mix with the water.

Explanation:

This works because soap is made up of molecules with two different ends.

The soap molecules works as a surfactant for the water oil interphase. The hydrophobic head of the soap molecules trap the oil and dirt ad remove from the surface.

Surfactants are chemical substances used to reduce the interfacial tension between substance boundary. Soaps and detergents acts as surfactants which are used to remove the dirt and oil from material surface.

Soap has both polar and non-polar characteristics. The alkaline part  in the soap causes it to have a polar head, and because of the electric charge on this head, the soap is hydrophilic. A hydrophilic part of soap is drawn to water and will cling to it.

In this instance, the positive-charged hydrogen atoms of the water's hydrogen atoms match with the polar head of the soap molecule. The other part of soap is a fatty acid tail, which is hydrophobic and can bind with the oil and dirt. The trapped oil molecules are then be removed by water.

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Answer:

please put the full question

Explanation:

Answer:

It takes 6h to the radioactive source decrease its activity from 200 to 25

Explanation:

The equation that describes the readioactive decay is:

Ln [A] = -kt + Ln [A]₀

Where [A] could be taken as activity of the source after time t, [A]₀ is initial activity and k is decay constant.

Decay constant could be written as:

k = ln2 / Half-life

k = ln 2 / 2h

k = 0.3466h⁻¹

Replacing in decay equation:

Ln [25] = -0.3466h⁻¹t + Ln [200]

-2.0794 = -0.3466h⁻¹t

6h = t

It takes 6h to the radioactive source decrease its activity from 200 to 25

Some examples of evidence that support Darwin's theories of evolution and natural selection , such as fossils and similarities between related living organisms.

Darwin employed certain sorts of evidence to support his hypothesis of natural selection, and these types of evidence are still used today. Examples include fossils and similarities between related living animals. Others, like DNA analysis, were unavailable to Darwin's generation but are now employed by scientists to further our understanding of evolution.  evidence supporting evolution: fossil strata, remains of extinct organisms, similarities between current-day organisms, DNA similarities, and embryonic similarity. Artificial selection, or breeding, is a crucial sort of evidence that Darwin looked at and is being looked at and employed today.

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answer:

IMAGE IS SUPER UNCLEAR SORRY LUV <3

explanation:

your phone must me from 2009 with that trash camera quality sweetie i suggest you get a new one... oh wait you can't you're broke :(

Answer:

high kinetic

Explanation:

I just did it

Answer: the answer is high kinetic energy

Explanation:

When a glass rod is held over a burning candle, physical change as well as chemical change occurs in the glass rod as well as the candle wax respectively.

Physical and chemical changes occur while a candle burns. Physical changes occur in a burning candle when the candle wax melts and forms liquid wax when heated. It is a bodily transformation. Because it solidifies again when cooled. This is also a change that may be reversed. Chemical Changes in a Burning Candle When you burn the candle, the wax around the wick melts. The wick of the candle is absorbed by liquid wax. The heat created by the flame causes the liquid wax to evaporate. This wax vapor burns near the flame, producing new chemicals such as carbon dioxide, carbon soot, water vapors, heat, and light. This is a permanent alteration.

A chemical change is illustrated by the burning of a candle. Two reactants unite to generate new products in chemical reactions. Wax is a kind of hydrocarbon. When hydrocarbons burn, they react with oxygen to produce carbon dioxide and water vapor.

A candle wick transports fuel by a method known as capillary action. Through the wick, liquid fuel (wax) reaches the flame, vaporizes, and burns. The candle wicks devour themselves before the wax is eaten. The wicks are coated with wix to supply the initial fuel source, and when consumed, the wicks are transformed to \(CO_2\) and water vapor through the chemical process known as burning.

The blackening of a glass rod is only a physical change. Glass rod's chemical structure will not have altered. Soot has accumulated on the glass rod. The rod has no effect on anything.

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Answer:

I just did it home slice the first one's Ag+ and Zn2+ and the second one is A

Explanation:

I just did the assignment

Answer:

ag+ and zn2+

Explanation:

second question is A

Answer:

Assuming the mass of Na2SO4.10H2O obtained from the crystallization was: 8.5g

The % yield is 94.3%

Explanation:

Assuming the mass of Na2SO4.10H2O was:

Based on the reaction:

2NaOH + H2SO4 + 8H2O →Na2SO4.10H2O

Where 2 moles of NaOH reacts producing 1 mole of Na2SO4.10H2O

To solve this question we need to find the moles of NaOH added. With the moles and the reaction we can find the moles of Na2SO4.10H2O and its actual theoretical yield. Assuming the mass of Na2SO4.10H2O produced was: 8.5g

we can find the percent yield as follows:

Moles NaOH:

25.0cm³ = 0.0250dm³ * (2.24mol/dm³) = 0.056 moles NaOH

Moles Na2SO4.10H2O:

0.056 moles NaOH * (1mol Na2SO4.10H2O / 2mol NaOH) = 0.028 moles Na2SO4.10H2O

Mass Na2SO4.10H2O:

0.028 moles Na2SO4.10H2O * (322g / mol) = 9.016g Na2SO4.10H2O = Theoretical yield

Percent yield is 100 times the ratio between actual yield:

8.5g / 9.016g * 100 = 94.3%

In the context of atomic orbital (AO) wavefunctions, the terms "radial node" and "nodal plane" refer to different aspects of the wavefunction's behavior.

A radial node is a region in the AO wavefunction where the probability of finding an electron is zero along the radial direction. In other words, it represents a spherical shell where the electron is unlikely to be found. The number of radial nodes is determined by the principal quantum number (n) of the orbital. For example, the 2s orbital has one radial node, while the 2p orbital has no radial nodes.

On the other hand, a nodal plane is a flat plane within the AO wavefunction where the probability of finding an electron is zero along a particular direction. It represents a surface that divides the orbital into two regions of opposite phases. The number of nodal planes is determined by the angular quantum numbers (l and m) of the orbital. For example, the 2s orbital has no nodal planes, while the 2p orbital has one nodal plane (the xz or yz plane).

Radial nodes arise from the radial part of the wavefunction because they depend on the distance from the nucleus. The radial part determines the distribution of the electron density as a function of distance, and the nodes correspond to regions where the density drops to zero.

On the other hand, nodal planes arise from the angular part of the wavefunction because they depend on the orientation and shape of the orbital. The angular part describes the angular distribution of the electron density around the nucleus, and the nodal planes correspond to regions where the phase of the wavefunction changes sign.

In summary, radial nodes are related to the distance from the nucleus and arise from the radial part of the wavefunction, while nodal planes are related to the orientation and shape of the orbital and arise from the angular part of the wavefunction. The 2s orbital has one radial node and no nodal planes, while the 2p orbital has no radial nodes and one nodal plane.

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The molarity of HCl in the titration solution is 0.067 M.

To calculate the molarity of HCl, we need to use the balanced chemical equation for the reaction between HCl and NaOH:

HCl + NaOH → NaCl + \(H_2O\)

We can see that the stoichiometry of the balanced equation is 1:1, which means that one mole of HCl reacts with one mole of NaOH.

In the titration, 10 mL of 1 M NaOH was added to 150 mL of HCl. Since we know the volume and concentration of NaOH, we can calculate the number of moles of NaOH used:

moles of NaOH = volume of NaOH * concentration of NaOH

             = 0.01 L * 1 mol/L

             = 0.01 mol

According to the balanced equation, 0.01 moles of NaOH reacted with 0.01 moles of HCl. Therefore, the number of moles of HCl in the 150 mL solution is also 0.01 mol.

To calculate the molarity of HCl, we need to divide the moles of HCl by the volume of the solution in liters:

molarity of HCl = moles of HCl / volume of solution in liters

              = 0.01 mol / 0.150 L

              = 0.067 M.

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The compound is ionic and acidic in nature as the solvation leads to the formation of an acid.

We know that a compound is made up of atoms. The atoms in the compound have to be arranged in a particular way. The way that the atoms are arranged has a lot to do with how the compound acts.

We want to know if the compound Sodium Perbromate is ionic or molecular. How can we know this? By inspection, it is clear that there is the sodium ion and the Perbromate ion hence the compound is ionic.

When we dissolve the compound in water, the solvation of the compound would give rise to the per bromic acid hence the compound is acidic .

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Answer:

2KCl + MgF2 ➡️ MgCl2 + 2KF

Answer:

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion. The degree to which the particles move is determined by the amount of energy they have and their relationship to other particles.

Explanation:

When acetanilide is combined with an inorganic compound like sand, the melting point of the sample remains constant. Because acetanilide has a melting point of 114.3° Celsius, the melting point after mixing the inorganic compound will be the same as before crystallization.

What is Acetanilide?

Acetanilide is a colorless, odorless solid chemical that resembles a leaf or flake. N-phenylacetamide, acetanil, and acetanilid are other names for it.

Acetanilide is used to stabilize cellulose ester varnishes and as a hydrogen peroxide decomposition inhibitor. It has also been used as an intermediator in the synthesis of rubber accelerators, dyes and dye intermediates, and camphor. Acetanilide is used to make 4-acetamidobenzenesulfonyl chloride, a key intermediate in the production of sulfa drugs.

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The ratio of the acidic form of serine to the basic form of serine can be expressed using the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the dissociation constant of serine (which is around 2.2), [A-] is the concentration of the basic form of serine, and [HA] is the concentration of the acidic form of serine.

Assuming that the total concentration of serine is 1.0 (i.e., [A-] + [HA] = 1.0), we can set up the following equation:

60 = [A-]/[HA]

or

[A-] = 60[HA]

Substituting this expression for [A-] into the Henderson-Hasselbalch equation, we get:

pH = 2.2 + log(60[HA]/[HA]) = 2.2 + log(60) = 4.8

Therefore, the pH of the solution where the ratio of the acidic form of serine to the basic form of serine is 60.0 is approximately 4.8.

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Answer:

The right answer is "58.3%".

Explanation:

The given values are:

Mass of lithium carbonate,

= 700 mg

i.e.,

= 0.7 g

Mass of tablet,

= 1.20 g

Now,

The percentage of active ingredient will be:

=  \(\frac{Mass \ of lithium \ carbonate}{Mass \ of \ tablet}\times 100\)

On substituting the given values, we get

=  \(\frac{0.7}{1.20}\times 100\)

=  \(0.583\times 100\)

=  \(58.3\)%

Answer: C

Explanation:

Answer:

3p6 3d4

Explanation:

3d will come after 3p => 3p 3d

p will hold maximum of 6 electrons while d will hold maximum of 10 electrons.

if there are 8 more electrons to 3p2, then 4 will fill 3p so it will become 3p6

then the other 4 will fill 3d to become 3d4

Answer:

The balanced chemical equation is Pb(NO3)2 + 2KI produces PbI2 + 2K(NO)3. In chemistry, this is called a double replacement reaction. Lead nitrate and potassium iodide, which are the reactants, are powders that react to form a yellow-colored lead iodide and a colorless potassium nitrate.

Explanation:

Answer:

2KI+Pb(NO3)2 ⇒ PbI2 + 2KNO3

The reaction of silver nitrate with copper is a substitution reaction. We have copper in its free state, Cu, and we have silver nitrate which has the formula AgNO3. The copper replaces the silver obtaining the following reaction:

The products obtained are copper nitrate and silver.

The word equation will be:

Answer:

the nobel gases are unreactive bcz it alredy has stable electronic configuration due to which it neither donate nor receive electrons during the chemical reaction so ,it is are unreactive..

Answer:

Noble gases are nonreactive because their duplet and octet is complete. They no more need any electron to complete their duplet or octet. Elements are usually reactive because they tend to lose and gain electrons and Since noble gases have no tendency to gain or lose electrons, They are inert, noble and nonreactive.

The evidence that indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier: Whole logs mixed in with the rocks, Clay-sized particles and An abundance of snow and ice

The following evidence indicated that the map made near Lake Tapps in Washington was a massive lahar from Mt. Rainier and not an old glacier:

Whole logs mixed in with the rocks: The presence of whole logs mixed in with the rocks suggests a rapid and powerful flow, characteristic of a lahar, rather than the slow movement associated with glaciers.

Clay-sized particles: The presence of clay-sized particles is often associated with lahars, as they can be easily transported by the flowing volcanic material.

An abundance of snow and ice: The presence of snow and ice is indicative of a recent event, as glaciers tend to accumulate and retain snow and ice over time. In the case of a lahar, the presence of snow and ice suggests a more recent deposition.

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