Answer the following questions. Give details to explain your reasoning in each response. Consider the following phase change diagram. 1.) Describe the temperature of the substance from point D to point E. What is happening during this time period? (35 points) 2.) Between what points on the graph will you find a substance in the solid phase? Explain your answer. (30 points) 3.) Which phase change on the diagram requires the greatest change in energy? Explain how you reached your

The answer is B since the carboxylic acid group is COOH

Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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Answer:

5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.

Explanation:

Using the ideal gas law, PV=nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin, we can solve for V.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15 K. Therefore, the temperature is 25.0 + 273.15 = 298.15 K.

Next, we can plug in the values we know:

PV = nRT

(153 kPa) V = (5.00 mol) (8.31 J/mol*K) (298.15 K)

Simplifying:

V = (5.00 mol) (8.31 J/mol*K) (298.15 K) / (153 kPa)

V = 103.6 L

Therefore, 5.00 mol of an ideal gas will occupy 103.6 L at 25.0 C and 153 kPa of pressure.

cutting a piece of paper

Explanation:

Answer:

A physical change occurs when a substance changes, but no new substance is formed.

Explanation:

Answer:

The correct answer would be - lose their native habitats are forced to migrate into new areas in search of shelter and food.

Explanation:

The removal of trees or deforestation to build a housing or city planning or development impact the birds and other animals of that area. Cutting most of the trees from the area will result in a decrease in available food, shelter, and breeding habitat.

It causes complete removal of bird species and forced them to migrate to a new place in search of places that will provide a source of shelter and food for birds.

The Big Bang theory is one of the ones used most frequently nowadays to describe how the cosmos came into being.

According to this theory, the universe formed 13.8 billion years ago as a result of the primordial atom, a single particle, exploding and generating an unprecedented cosmic disaster. The universe is always expanding, according to the same theory.

The key supporting data for the big bang theory are:

The galaxies to getting further and distant from us. This distance is taken at high speeds. In other words, the distance between galaxies is inversely correlated with their spacing velocity. Our perception of galaxy dysthanization occurs because the universe is continually expanding, according to this data, which is known as the "Hubble Law," and this hypothesis also explains that The cosmos has already been unified.

According to the big bang theory, the cosmos was extremely hot at the time of its creation; if this is accurate, we should find some proof of this warmth. Radio astronomers discovered this proof when they noticed that microwaves with a temperature of 2,725 degrees Kelvin included cosmic background radiation. This radiation is perhaps proof of the universe's high temperature.

Last but not least, the Big Bang most likely contributed to the abundance of hydrogen and helium elements.

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Explanation

Given:

i = 2

boiling point of water = 100 'C

KCl boiling point = 102.5 'C

Required: Molality (m) of the solution

Solution

DT = i x Kb x m

DT = 102.5-100 = 2.5 'C

DT = i x Kb x m

2.5 = 2 x 0.512 x m

2.5 = 1.024m

molality = 2.44 m

Answer

Molality = 2.44 m

Answer:

If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.

Considering the phase diagram, the state of matter that exists in area B is gas.

The correct option is A.

A phase diagram is a graphical representation that shows the conditions of temperature and pressure at which different phases or states of a substance exist.

The axes of a phase diagram typically represent temperature (usually on the horizontal axis) and pressure (usually on the vertical axis). The diagram is divided into regions that correspond to different phases, and the lines separating these regions represent phase boundaries.

The point where three phase boundaries meet is known as the triple point, which represents the temperature and pressure at which all three phases can coexist in equilibrium.

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There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, Strontium belongs to group 2, alkaline earth metal family of the periodic table.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Strontium is the element having 38 protons and 50 neutrons.

mass number= proton number + neutron number

                      =38+ 50

                     =88

Group number of this element is group 2. Strontium belongs to akaline earth metal family.

Therefore, Strontium belongs to group 2, alkaline earth metal family of the periodic table.

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the pH of a solution that is 0.036 M in NH4Cl at 25 °C, x=5.3×10−6 M​.

We obtain a pH of 9.068 and 9.07 n by dividing the logarithm of the ammonium acid concentration (0.03) by the log of a ammonia concentration (0.02).

Ammonia is a salt of a weak base and a strong acid, such as hydrochloric acid (like ammonium hydroxide).Ammonium chloride's formula is NH 4 Cl, hydrochloric acid's formula is and ammonium hydroxide's formula is NH 4 OH.

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Xeriscaping is a landscaping approach that focuses on conserving water by using drought-tolerant plants and efficient irrigation techniques. The goal is to create a visually appealing and sustainable garden while minimizing water usage.

Successful xeriscaping projects involve several key elements. Firstly, careful plant selection is crucial, opting for species that can thrive in arid conditions without excessive watering. Mulching is used to reduce evaporation and retain soil moisture.

Proper soil preparation, such as improving drainage and adding organic matter, promotes healthier plant growth. Efficient irrigation systems, like drip irrigation or soaker hoses, deliver water directly to plant roots, minimizing wastage.

Additionally, controlling erosion through the use of retaining walls or terracing is important. Lastly, regular maintenance, including appropriate pruning and weed control, ensures the longevity and vitality of the xeriscape garden. Overall, a successful xeriscaping project harmonizes sustainable practices with a beautiful outdoor environment.

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Answer:

B

Explanation:

an alkene because of the presence of the double bond

alcohol because of the presence of the OH group

Therefore,  mass A0 that was present 8.00 hours ago is 143.1g

The half life of the substance is 3.20 which means the substance will be halved at 3.20 hours.

At =AO*(1/2)(t/3.20)

We were given 25.3  g so lets substitute the value.

25.3 =AO*(1/2)(t/3.20)

25.3=AO*(1/2)(8/3.20)

25.3=AO*0.1768

AO= 25.3/0.1768

AO=143.1g

Therefore,  mass A0 that was present 8.00 hours ago is 143.1g

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Answer:

If its dirty water than its good to boil the water using fire in the bottom and the water in the top and after a bit of time than it will become clean water.

Explanation:

Answer:

Corresponding with orange light, is the wavelength that blue solutions absorb the most.

Explanation:

When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.

Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.

Answer:

1 - does not flow easily and is difficult to compress

2 -does not flow easily and is difficult to compress.

3 -has lots of space between the charged particles.

4-flows easily but is difficult to compress.

Explanation:

Answer:

2.11 molecules of CO₂

Explanation:

Given data:

Mass of CO₂ = 15.2 g

Molecules of CO₂ = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 15.2 g/ 44 g/mol

Number of moles = 0.35 mol

Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.35 mol × 6.022 × 10²³ molecules / 1 mol

2.11 molecules of CO₂

The theoretical yield of titanium tetrafluoride is 2.79 g

We know that the theoretical yield is the yield of the product that we can obtain from the stoichiometry of the problem. We now have to go back to the reaction equation and write;

\(Ti(s) + 2F_{2} (g) --- > TiF_{4} (s)\)

Number of Ti = 2.5g/48 g/mol = 0.052 moles

Number of moles of F2 =  1.7 g/38 g/mol  0.045 moles

If 1 mole of Ti reacts with 2 moles of F2

0.052 moles reacts with 0.052 moles * 2 moles/1 mole

= 0.10 moles

We can see that F2 is the limiting reactant

If 2 moles of F2 1 mole of \(TiF_{4}\)

0.045 moles of F2 produces 0.045 moles * 1 mole/2 moles

=  0.0225 moles

Mass of titanium tetrafluoride = 0.0225 moles * 124 g/mol

= 2.79 g

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The number of common amino acids that are formed and used by living organisms is twenty (20), and nine are essential for living.

Amino acids are the building blocks of proteins that are linked by peptide bonds to form biomolecules. Proteins may be composed of 20 different types of amino acids, which include 9 essential amino acids that the human cannot synthesize and must be consumed from the diet.

Amino acids include, for example, leucine, isoleucine, tryptophan, tyrosine, etc. All these molecules contain an amino group and also a carboxylic group that gives them the name of amino acids.

Therefore, with this data, we can see that amino acids are composed of an amine group and a carboxylic group and they are 20 of which nine (9) are essential because the human body cannot synthesize them and must be obtained from the foods.

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The molar mass of CuCl2 is 134.452 g/mol. Each element's molar mass can be found in its designated box on the periodic table.

Answer:

There are 3.011 × 10^23 oxygen atoms

The balanced chemical equation for the reaction is:

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Sodium hydroxide => NaOH

Iron (II) chloride => FeCl₂

2NaOH(aq) + FeCl₂(aq) --> 2NaCl(aq) + Fe(OH)₂(s)

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Answer:

178.55

Explanation:

176 × 0.05+ 177 × 0.19 + 178 × 0.27 + 179 × 0.14 + 180 × 0.35 = 178.55

the average atomic mass of hafnium given the following abundance information on the isotopes 178.55.

The isotope can be defined as the elements with the same atomic number with different mass number, here atomic mass can be defined as the number of protons and neutrons present in nucleus while the total number of protons called as atomic number.

The Isotopic forms of Oxygen is Oxygen -16, Oxygen -17, Oxygen -18, similarly Isotopic forms of Uranium is U-235, U-238 and the Chemical properties of isotopes are identical,  the isotopes of hydrogen are the numbers of neutrons which show major effect on the size of the nucleus.

Physical properties of isotopes  vary as it depend on the mass, fractional distillation and diffusion processes.

176 × 0.05+ 177 × 0.19 + 178 × 0.27 + 179 × 0.14 + 180 × 0.35 = 178.55

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Answer:

H2O2

Explanation:

By numbering the atoms we know about that it’s Hydrogen Peroxide

Answer:

All three titrations require the same volume of NaOH to reach the first equivalence point.

Explanation:

Statements are:

All three titrations have the same final pH.

All three titrations require the same volume of NaOH to reach the first equivalence point.

All three titrations have the same pH at the first equivalence point.

All three titrations have the same initial pH.

The pH of the titration depends of the nature of the acid: If the acid is a strong acid, pH at the equivalence of the titration is 7. For a weak acid equivalence point depends of the nature of the conjugate base and initial pH of the weak acid. For a diprotic acid also depends of the nature of the acid.

Thus:

All three titrations have the same initial pH, All three titrations have the same pH at the first equivalence point. and All three titrations have the same final pH.  are the three FALSE.

As the concentrations of the acids is 0.10M and are titrated with 0.100M NaOH, The volume to reach the first equivalence point is the same for all the three acids.

Thus:

Answer:

A is correct answer for your question. A

Explanation:

A P E X

The purpose of the flame that is lit below a hot air balloon is to Increase Enthalpy. Hence, Option (A) is Correct.

A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

A hot air balloon uses a burner to heat up the air inside the balloon. The burner is usually fueled by liquid propane. The burner mixes the fuel with air and ignites the mixture, which creates a flame directly underneath the bottom opening of the hot air balloon.  

Once the air inside the balloon begins to get warm, the balloon will rise. The pilot controls the balloon’s altitude by releasing hot air from a vent at the top of the balloon, releasing the warmer air causes the balloon to descend.

Therefore, The purpose of the flame that is lit below a hot air balloon is to Increase Enthalpy. Hence, Option (A) is Correct.

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2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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