Calculate [H+] and [OH-] as required for each of the following
solutions at 25 °C, and state whether the solution is neutral, acidic,
or basic.
a. 1.0x 10-5 MOH-
Q
b. 1.0x 10-7 MOH-
c. 10.0 MH+​

Answer:

Crest is the highest point of a wave

Answer:

ΔS°reaction = 100.9 J K⁻¹ (mol C₃H₈)⁻¹

Explanation:

The equation for the reaction is given as;

C₃H₈(g) + 5O₂(g) → 4H₂O(g) + 3CO₂(g)

In order to determine the entropy change, we have to use the entropy valuues for the species in the reaction. This is given as;

S°[C₃H₈(g)] = 269.9 J K⁻¹ mol⁻¹

S°[O₂(g)] = 205.1 J K⁻¹ mol⁻¹

S°[H₂O(g)] = 188.8 J K⁻¹ mol⁻¹

S°[CO₂(g)] = 213.7 J K⁻¹ mol⁻¹

The unit of entropy is J K⁻¹ mol⁻¹

Entropy change for the reaction is given as;

ΔS°reaction = ΔS°product - ΔS°reactant

ΔS°reaction = [(4 * 188.8) + (3 * 213.7)] - [269.9 + (5 * 205.1)]

ΔS°reaction = 100.9 J K⁻¹ (mol C₃H₈)⁻¹

The entropy change for the combustion of gaseous propane, under standard state conditions  100.9 J K⁻¹.

The equation for the combustion of gaseous propane is given as follows:-

C₃H₈(g) + 5O₂(g) → 4H₂O(g) + 3CO₂(g)

In order to determine the entropy change, we have to use the entropy values for the species in the reaction. This is as follows:-

S°[C₃H₈(g)] = 269.9 J K⁻¹ mol⁻¹

S°[O₂(g)] = 205.1 J K⁻¹ mol⁻¹

S°[H₂O(g)] = 188.8 J K⁻¹ mol⁻¹

S°[CO₂(g)] = 213.7 J K⁻¹ mol⁻¹

The unit of entropy is J K⁻¹ mol⁻¹

Entropy change for the reaction is given as;

ΔS°reaction =nproduct ΔS°product - nreactantΔS°reactant

ΔS°reaction = [(4mol * 188.8 J K⁻¹ mol⁻¹) + (3 mol * 213.7 J K⁻¹ mol⁻¹)] - [(1 mol*269.9J K⁻¹ mol⁻¹ )+ (5 mol* 205.1  J K⁻¹ mol⁻¹)]

ΔS°reaction = 100.9 J K⁻¹

So, the entropy change for the combustion of gaseous propane is 100.9 J K⁻¹ .

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Answer:

No, compound A and B are not the same compound

Explanation:

According to the law of definite proportion "every chemical compound contains fixed and constant proportions (by mass) of its constituent elements." (Encyclopedia Britannica)

We can see in the question that the ratio of flourine to sulphur in compound A is 1.18 while the ratio of flourine to sulphur in compound B is 2.37.

The two chemical compounds do not contain a fixed proportion by mass of their constituent elements therefore, they can not be same compound according to the law of definite proportions.

Answer:

Future tense.

Explanation:

The different tenses in grammar are used to denote the time or condition of when the action occurs. This means that tenses tell us the form or condition of the verbs.

The present tense tells us about a present scene while the past tense tells us about an action that happened in the past. Likewise, the future tense tells us about an event that will happen in the future. This means that future tenses are used to describe events that have not taken place, and are yet to happen.

Answer:

The potential energy the apple had due to its height is converted to kinetic energy

Explanation:

When an apple falls from the tree to the ground, its energy of position stored as gravitational potential energy is converted to kinetic energy, the energy of motion, as it falls. When the apple hits the ground, kinetic energy is transformed into heat energy.

Answer:

il got this from goglle

Explanation:

hope it helps

This question is incomplete, the complete question is;

The enthalpy change for the reaction between two molecules of carbon oxysulfide (COS) to form one molecule of CO₂ and one molecule of CS₂, as shown below, is -3.2 x 10⁻²⁴ kJ per molecule of COS.

The bond energy for the C-S bond in C=S has been determined to be 552 kJ/mol.

What is the apparent bond energy of a carbon-sulfur bond in COS?

NOTE: A C=O bond adjacent to another double bond is not the same as a C=O bond that is not adjacent to another double bond.  

Answer:

The apparent bond energy of a carbon–sulfur bond is 550.1 kJ/mole

Explanation:

Given the data in the question and the figure 8.122 in the image below;

the given reaction can be written as follows;

2COS -----→ CO₂ + CS₂

Δ[tex]H_{rxn}[/tex] = ∑ Bond Energy ( reactants) - ∑ Bond Energy (products)

= [ (2 × C=O) + (2 × C=S) ] - [ (2 × C=O) + ( 2 × C=S) ]

we know that;

Δ[tex]H_{rxn}[/tex]  = -3.2 x 10⁻²⁴ kJ per molecule

= -3.2 x 10⁻²⁴ kJ × 2 × 6.023 × 10²³ kJ/mole

= -3.85 kJ/mole

Hence;

-3.85 kJ/mole = (2 × C=S)[tex]_{reactant}[/tex] - ( 2 × C=S)[tex]_{product}[/tex]

-3.85 kJ/mole = (2 × C=S)[tex]_{reactant}[/tex] - ( 2 × 552 kJ/mole)

(2 × C=S)[tex]_{reactant}[/tex] = -3.85 kJ/mole + 1104 kJ /mole

(2 × C=S)[tex]_{reactant}[/tex]  = 1100.15 kJ/mole

2 × ( C=S)[tex]_{reactant}[/tex] = 1100.15 kJ/mole

( C=S)[tex]_{reactant}[/tex] = 1100.15 kJ/mole / 2

( C=S)[tex]_{reactant}[/tex] = 550.1 kJ/mole

Therefore, the apparent bond energy of a carbon–sulfur bond is 550.1 kJ/mole

The apparent bond energy of a carbon-sulfur bond in COS is equal to 550.08 kJ/mol.

Given the following data:

Scientific data:

To determine the apparent bond energy of a carbon-sulfur bond in COS:

First of all, we would write a balanced chemical equation for the chemical reaction as follows:

                                   [tex]2COS \rightarrow CO_2 + CS_2[/tex]

The enthalpy change of two (2) moles of COS is:

[tex]\Delta H_{rxn} = -3.2 \times 10^{-24}\times 2 \times 6.02 \times 10^{23}\\\\\Delta H_{rxn} =-3.85\;kJ/mol.[/tex]

Mathematically, the enthalpy change of a chemical reaction is given by this equation:

[tex]\Delta H_{rxn} = \sum Bond\;Energy_{(reactansts)} - \sum Bond\;Energy_{(products)}\\\\\Delta H_{rxn} = [(2\times C=O)+ (2\times C=S)]- [(2\times C=O)+ (2\times C=S)][/tex]

Substituting the parameters into the equation, we have;

[tex]-3.85 = (2\times C=S)- [2\times 552]\\\\(2\times C=S)=1104-3.85\\\\(2\times C=S)=1100.15\\\\(C=S)=\frac{1100.15}{2} \\\\(C=S)=550.08\;kJ/mol[/tex]

Therefore, the apparent bond energy of a carbon-sulfur bond in COS is equal to 550.08 kJ/mol.

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Complete Question:

The enthalpy change for the reaction between two molecules of carbon oxysulfide (COS) to form one molecule of [tex]CO_2[/tex] and one molecule of [tex]CS_2[/tex], as shown below, is [tex]-3.2 \times 10^{-24}[/tex] kJ per molecule of COS.  The bond energy for the C-S bond in C=S has been determined to be 552 kJ/mol. What is the apparent bond energy of a carbon-sulfur bond in COS?

[Note: A C=O bond adjacent to another double bond is not the same as a C=O bond that is not adjacent to another double bond.]

Answer: 190.9K

Explanation:

5.6(14) = 5(.0821)T  or  (5.6*14)/(5(.0821))

78.4 = 0.4105T

190.9K = T

Answer:

23.6 moles

Explanation:

From the question given above, the following data were obtained:

Mass of air = 3.6 Kg

Mass percentage of O₂ = 21%

Number of mole of O₂ =?

Next, we shall convert 3.6 Kg of air to grams (g). This can be obtained as follow:

1 kg = 1000 g

Therefore,

3.6 Kg = 3.6 Kg × 1000 / 1 kg

3.6 Kg = 3600 g

Next, we shall determine the mass of O₂ in the air. This can be obtained as follow:

Mass of air = 3600 g

Mass percentage of O₂ = 21%

Mass of O₂ =?

Mass of O₂ = 21% × 3600

Mass of O₂ = 21/100 × 3600

Mass of O₂ = 756 g

Finally, we shall determine the number of mole of O₂ in the sample of air. This can be obtained as follow:

Mass of O₂ = 756 g

Molar mass of O₂ = 2 × 16 = 32 g/mol

Number of mole of O₂ =?

Mole = mass /Molar mass

Number of mole of O₂ = 756 / 32

Number of mole of O₂ = 23.6 moles

Thus, the number of mole of O₂ in the

sample of air is 23.6 moles

Answer:

a. During incomplete metamorphosis, the nymph molts its exoskeleton. During complete metamorphosis, the larva forms a chrysalis or cocoon.

Explanation:

The first stage of incomplete metamorphosis is the egg. During this time, the insect will hatch into a form called a nymph. The nymph is basically a small version of the adult insect. This is very similar to how a child looks like his or her parents.

The correct statement that describes components of complete and incomplete metamorphosis is: d. Incomplete and complete metamorphosis both have three major stages.

Metamorphosis is a biological process that some animals undergo to transform from one developmental stage to another, typically from a juvenile form to an adult form. This process involves a series of physical and physiological changes that can be dramatic and even complete.

Incomplete metamorphosis consists of three stages: egg, nymph, and adult. The nymph hatches from the egg and looks similar to the adult but lacks wings and reproductive organs. The nymph molts its exoskeleton several times and gradually develops into an adult.

Complete metamorphosis also consists of three stages: egg, larva, pupa, and adult. The larva hatches from the egg and looks completely different from the adult, often worm-like in appearance. The larva undergoes a series of molts and grows larger, then forms a pupa or chrysalis. Inside the pupa or chrysalis, the larva undergoes a complete transformation and emerges as an adult.

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Answer:

neutral and current

Explanation:

sorry if im wrong ;(

Answer:

See explanation and image attached

Explanation:

The mechanism for both the hydroboration of 2-methyl-1-pentene and acid-catalyzed hydration are shown i the image attached to this answer.

The both processes involve addition reaction. Hydroboration  is similar to hydration but the orientation of addition is anti - Markovnikov in nature.

The acid-catalyzed hydration of  2-methyl-1-pentene yields a minor product and a major product. The major product is  an accordance with Markovnikov  rule as shown by the reaction mechanism. The minor product is anti - Markovnikov.

Answer:

B, C, D, E

Explanation:

According to Henry's law, as the pressure is increased, the solubility of a given gas increases. So, solubility is directly proportional to pressure.

Thus, the following statements are correct:

B. More gas molecules are soluble as pressure is increased.

Is correct because as the pressure is increased, the solubility increases.

C. The solubility of a gas decreases with a decrease in pressure.

Is correct because solubility and pressure are directly proportional: if the pressure is decreased, the solubility will be decreased.

D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.

Is correct because 2.00 atm is twice 1.00 atm, so if the pressure is increased twice, the solubility is increased twice.

E. The concentration of gas particles in the solution is higher at 4.25 atm than at 1.00 atm.

Is correct because 4.25 atm>1.00 atm (the higher the pressure, the higher the solubility, and therefore the concentration of gas particles in solution).

The remaining options (A, G) are incorrect. They contradict Henry's law.

Answer:

240 g/mol

Explanation:

We'll begin by writing the chemical formula of Disodium sulfide nonahydrate. This is illustrated below:

The molecular formula of disodium sulfide nonahydrate is Na₂S.9H₂O

Finally, we shall determine the molar mass of disodium sulfide nonahydrate, Na₂S.9H₂O. This can be obtained by adding the individual molar mass of the element present in the compound as illustrated below:

Molar mass of Na₂S.9H₂O = (23×2) + 32 + 9[(2×1) + 16]

= 46 + 32 + 9[2 + 16]

= 46 + 32 + 9[18]

= 46 + 32 + 162

= 240 g/mol

Thus, the molar mass of disodium sulfide nonahydrate, Na₂S.9H₂O is 240 g/mol

Answer:

any of these

Explanation:

kinetic energy: kinetic is motion, or released energy

Potential energy: porential energy is the energy of position or stored energy.

Thermal energy: is heat energy, it is stored energy that creats heat.

Answer:

RCl

Explanation:

Here, let us take ROH to represent the formula of our alcohol where R is the alkyl group.

The reaction of ROH with  tosyl chloride yields an ester called a tosylate. It is the O-H bond not the C-O bond that is cleaved when the tosylate is formed.

Tosylates are good leaving groups, attack of a nucleophile such as Cl^- completes the mechanism leading to the formation of RCl.

When hydrogen and oxygen combine, they form water or hydrogen peroxide, and energy is released in the process.

Oxygen and hydrogen are the chemical elements of the periodic table, and they both are gas. Oxygen is the most important gas, which is needed for breathing. It is present at 21% in the atmosphere.

Hydrogen is another gas present in nature. It is the lightest gas, and it has diatomic molecules. It remains gas at normal pressure and temperature, but it becomes liquid at low temperature.

The oxygen and hydrogen readily react and for water, and hydrogen peroxide, the process of reaction of hydrogen and oxygen releases an amount of energy.

Hence, Energy is released during the creation of water or hydrogen peroxide when hydrogen and oxygen mix.

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Answer:

Ca, Zn, Ni, Al, Fe

Explanation:

The activity series is an arrangement of metals in order of decreasing reactivity.

Metals that are high up in the activity series are very reactive. They displace metals that are lower in the activity series from an aqueous solution of their salts.

The metals; Ca, Zn, Ni, Al, Fe are all above Pb in the activity series hence they will cause Pb2+ ions to come out of solution as solid Pb.

A more reactive metal displaces the less reactive metals in the solution.  Ca, Al, Zn, and Fe can be accomplished to take out the [tex]\bold{ Pb^2^+}[/tex] from the solution as solid Pb.

Metal displacement Reaction:

In this type of reaction a more reactive metal displaces the less reactive metals in the solution.

The metal reactivity series

Ca > Al > Zn > Fe > Ni > Pb > Ag > Au

The lead ( Pb) is less reactive than the Ca, Al, Zn, and Fe.

Therefore,  Ca, Al, Zn, and Fe can be accomplished to take out the [tex]\bold{ Pb^2^+}[/tex] from the solution as solid Pb.

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Answer:

God

Explanation:

Answer:

because I want to save life

Answer:

CaCl2

Explanation:

Cacl2 would have greatest freezing point depression because in this case the vant Hoff factor is 2

More will be the value of vant Hoff factor more will be the depression in freezing point when concentration of all electrolyte is same

Answer: 90.04°C

Explanation: Calorimeter is a device measures the amount of heat of a chemical or physical process. An ideal calorimeter is one that is well-insulated, i.e., prevent the transfer  of heat between the calorimeter and its surroundings. So, the net heat change inside the calorimeter is zero:

[tex]q_{1}+q_{2}=0[/tex]

Rearraging, it can be written as

[tex]q_{1}=-q_{2}[/tex]

showing that the heat gained by Substance 1 is equal to the energy lost by Substance 2.

In our case, water is gaining heat, because its temperature has risen and so, brass is losing energy:

[tex]q_{water}=-q_{brass}[/tex]

Calculating:

[tex]m_{w}.c_{w}.\Delta T=-[m_{b}.c_{b}.\Delta T][/tex]

[tex]100.4.18.(18.4-15)=-[52.9.0.375.(18.4-T)][/tex]

Note: final temperature is the same as the substances are in thermal equilibrium.

Solving:

418(3.4)= - 365.01 + 19.8375T

19.8375T = 1786.21

T = 90.04

The initial temperature for the sample of brass was 90.04°.

Answer:

The peptide is composed of Alanine, Glycine and Serine and is written in shorthand as: Ala-Gly-Ser.

Explanation:

Amino acids contain an α-carboxyl group, an α-amino group, and an R side chain which distinguishes one amino acid from another.

Peptides are chains of amino acids which are covalently bonded together through substituted amide linkages known as peptide bonds. The reaction occurs between an amino group of one amino acid and the carboxyl group of another amino acid with the removal of a water molecule.

A tripeptide is a peptide composed of three amino acids linked together by peptide bonds.

In the given peptide, the first residue contains a methyl group side chain. The second residue contains a hydrogen atom side chain. The third residue contains a hydroxymethyl group side chain.

The amino acid that contains a methyl group side chain is Alanine (Ala).

The amino acid that contains a hydrogen atom side chain is Glycine, Gly.

The amino acid that contains a hydroxymethyl group side chain is Serine, Ser.

Therefore, the peptide is composed of Alanine, Glycine and Serine and is written in shorthand as: Ala-Gly-Ser.

Answer:

1

Explanation seems right

The magma and sediments formed in the great plains are came from the rocks of the rocky mountains. Therefore, claim 1 is correct.

Sedimentation is the geographical process of accumulation or deposition of the minerals and organic particles from the earth's surface is called sedimentation. This process results in the formation of sedimentary rocks.

Weathering or erosion of rocks by wind, water or other chemicals leads to the geological debris which then move to other places  deposits somewhere.

Rocks in the rocky mountains undergo erosion and the mass movements created by wind or water leads to the sedimentation of these rocky solids to other places. The rocks in the Great planes are reached there by the mass movement of the rocks of rocky mountains. Hence, claim 1 is correct.

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Answer:

ex.1

1.The water in the test tube expands as it is heated. There is only one direction to expand in, the glass tube. This glass tube is narrow so that a small change in volume will result in a considerable change in height; your signal is amplified. This is the same phenomenon as in thermometers with a glass bulb on the lower end.

2. there will be a thermal expansion will happened.

Answer:

2. A 3.C

Explanation:

Answer:

Sweden is the largest of the Nordic countries which are Denmark, Finland, Iceland, Norway, and, of course, Sweden. Sweden's three major cities are Stockholm which is the capital of the country, Gothenburg in the western coast, and Malmö down south.

Sweden is said to have more space to enjoy and relax than most other country. It is a place for people who love to be with nature to seek peace of mind to people who lives by adventure. A perfect vacation spot, Sweden boast of peaceful countryside, lakes and forest, a long coastline of islands good for water sports activities such as sailing and perfect Swedish mountains for skiing during winter. Sweden also has a lot to offer culture vultures and tourist with their rich culture. There are cathedrals and old houses and universities to visit, plus, a smorgasbord of food choices to fill the hungry traveler's stomach. The cities have great pubs and clubs for younger travelers who wants to experience nightlife in Sweden. And there are shopping malls and souvenir shops for everyone to enjoy. Other places of interest are Esrange, a racket launching

facility, Gotland, Sweden's largest island and Kebnekaise, the country's highest mountain.

Answer:

Ferries are sea transport in the form of boat or ship that carries passengers, cargo and sometimes vehicles. It is a type of public transportation that has been around for centuries. It is a cheaper way to travel from one point to another, but lately a trip through a ferry is made not only for financial consideration but for leisure as well. Today's ferries or cruise ships are more efficient and mostly built with the passenger's convenience in mind, and some big ones can accommodate hundreds of passengers, baggage and vehicles in one time. Ferries usually operate on frequent return service. Ferry rides are a relaxing way to travel and to see the sights along the way. One of the world's best ferry destinations is Sweden.

Sweden is the largest of the Nordic countries which are Denmark, Finland, Iceland, Norway, and, of course, Sweden. Sweden's three major cities are Stockholm which is the capital of the country, Gothenburg in the western coast, and Malmö down south.

Sweden is said to have more space to enjoy and relax than most other country. It is a place for people who love to be with nature to seek peace of mind to people who lives by adventure. A perfect vacation spot, Sweden boast of peaceful countryside, lakes and forest, a long coastline of islands good for water sports activities such as sailing and perfect Swedish mountains for skiing during winter. Sweden also has a lot to offer culture vultures and tourist with their rich culture. There are cathedrals and old houses and universities to visit, plus, a smorgasbord of food choices to fill the hungry traveler's stomach. The cities have great pubs and clubs for younger travelers who wants to experience nightlife in Sweden. And there are shopping malls and souvenir shops for everyone to enjoy. Other places of interest are Esrange, a racket launching facility, Gotland, Sweden's largest island and Kebnekaise, the country's highest mountain.

There are just so much outdoor and recreational activities in Sweden, and it is also child-friendly that it has become an ideal family vacation destination. Truly, a trip to Sweden is a rejuvenating experience. But the best way to start the Swedish vacation is by riding a ferry to Sweden.

Riding a Ferry to Sweden

Sweden is a country that can be visited through a ferry from different parts of Europe. There are regular ferry rides from Belgium, Denmark, Estonia, Finland, Latvia, Germany, Norway, Poland, Russia, and United Kingdom. It has become very accessible for travelers and tourist to enjoy the natural beauty and distinct cultural heritage of Sweden. There are a number of sea transport companies that carries passengers, cargo and vehicles that offers regular trips to and from Sweden. Some of the popular ones are Stena Lines, Silja Lines, Birka Cruises, Tallink Lines, Viking Lines, Scandlines, and DFDS. There are ports in major cities of Sweden as well as in Varberg, Helsingborg, Trelleborg, Visby, Ystad among others. Travelers and tourist can book their ferry to Sweden trips through their local travel agents, but they can also conveniently book their travels through the internet.

A luxurious ferry to Sweden usually has suites for honeymooners or multi-cabin that is ideal for family or group of friends making a trip via a ferry an enjoyable experience.

Explanation:

hope it's help you

Answer:

78.4

Explanation:

Answer:

Volume = 19.68 ml

Explanation:

The equation of the reaction is given as;

HNO3 + KOH ---> KNO3 + H2O

1 mol of HNO3 reacts 1 mol of KOH

Converting 0.276 g of KOH to mol;

Number of moles = Mass / Molar mass

Number of moles = 0.276g / 56.1056 g/mol

Number of moles = 0.00492

Since the mole relationship is 1 = 1;

This means 0.00492 mol of HNO3 reacts with 0.00492 mol of KOH

The relationship between molarity and volume id given as;

Molarity = Number of moles / Volume

Volume = Number of moles / Molarity = 0.00492 mol / 0.250 M

Volume = 0.01968 L

Volume = 19.68 ml