Some students investigate legi’s question. a. Suggest what preliminary work they need to do. b. Draw a table for their results. Include column headings

Answer:

5

Explanation:

Temperature calculates heat/the temperature in the specific location.

Answer:

Mole Ratio Fraction

Explanation:

That's the answer.......

Answer:

Explanation:

Mole Ratio Fraction

The value of the given pressure in atm is 0.18 atm.

A conversion factor, which is a ratio, is a statement of the relationship between two different units of measurement or physical quantities. It is used to convert a quantity from one unit to another while keeping the quantity's numerical value.

We have to note that;

1 atm = 760 mmHg

x atm = 135 mm Hg

Hence;

x = 1 atm*  135mmHg/760 mmHg

x = 0.18 atm

Conversion factors are widely used in various fields, including physics, chemistry, engineering, and finance.

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Answer:

CLIMB A MOUTAIN

Explanation:

B

Molar concentration of Sodium chloride (NaCl) means the number of moles of sodium chloride present in 1L of water.

Molar mass of NaCl = Molar mass of Na + Molar mass of Cl

Molar mass of NaCl = 23 + 35.5

Molar mass of NaCl = 58.5g

∴ 1L of water contains 55.55 moles of water. Hence,

Mass of ocean water = 55.55 × 18 = 999.9g

Since, 1L of ocean water has a mass of 999.9g of which 3.5% is the salt.

hence, (999.9) (0.035) = 34.99g

So, No. of moles of NaCl = Mass of NaCl / 58g NaCl per mol

No. of moles of NaCl = 34.99/58.5

No. of moles of NaCl = 0.59 moles

So, Molar concentration or Molarity would be 0.59 moles present in 1L of solution.

Hence, Molarity or Molar Concentration = Moles of NaCl/ Volume of solution (in L)

Molarity = 0.59/1L

⇒ Molarity = 0.59M

Hence, the molarity is 0.59M

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Answer:

Q = 63.9 kJ

Explanation:

Given that,

Mass of ice, m = 300 g

We need to find the heat needed to heat the given amount of ice at -5.00°C into steam at 100.°C

The specific heat of ice, c = 2.03 J/g °C

The formula for heat needed is given by :

\(Q=mc\Delta T\\\\Q=300\times 2.03\times (100-(-5))\\\\Q=63945\ J\\\\Q=63.9\ kJ\)

So, 63.9 kJ of heat is needed.

Answer:

Explanation:

substance (as an acid or salt) that when dissolved (as in water) conducts an electric current.

Answer:

An electrolyte is a compound which produces ions when dissolved in a solution such as water. These ions have either a positive or negative electrical charge, which is why we refer to these compounds as electro-lytes

Answer:

The balanced chemical equation for the reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl) is: CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂.

The molar mass of CaCO₃ is 100.0869 g/mol 1. Therefore, 8.2 g of CaCO₃ is equivalent to 0.0819 moles of CaCO₃.

Since the reaction requires 2 moles of HCl for every mole of CaCO₃, 0.0819 moles of CaCO₃ will require 0.1638 moles of HCl.

The molar mass of HCl is 36.46094 g/mol 2. Therefore, 0.1638 moles of HCl is equivalent to 5.97 g of HCl.

So, you will need approximately 5.97 g of hydrochloric acid (HCl) to react with 8.2 g of calcium carbonate (CaCO₃).

Explanation:

Answer: 22.5 percent of incoming solar radiation goes directly to the surface of the Earth and is absorbed.

Explanation: Transfer of radiation through a planet's atmosphere. A planet and its atmosphere, in our solar system, can radiate back to space only as much energy as it absorbs from incoming solar radiation.

Answer:

Explanation:

I have the notes

"Only about 40 percent actually reaches the surface of the earth"

"our atmosphere and clouds reflect bout 40 percent of incoming solar radiation back into outer space"

"The remaining 60 percent is responsible for warming the earth"

"About 20 percent of this radiation is absorbed directly by the atmosphere"

Answer:

This is a artesian well they are able to bring up water with out requiring a pump. This happens when there is enough pressure in the aquifer to push the water up to the surface.

Explanation:

Answer:

B

Explanation:

B

The molar solubility of PbBr₂ in a 0.2740 M Pb(NO₃)₂ solution is 0.0547 M.

The molar solubility of PbBr₂ in a 0.2740 M lead(II) nitrate, Pb(NO₃)₂, solution can be calculated using the common ion effect. Write the balanced equation for the dissolution of PbBr₂ in water:

PbBr₂(s) ⇌ Pb²⁺(aq) + 2Br⁻(aq)

Write the expression for the solubility product constant (Ksp) of PbBr₂:

Ksp = [Pb²⁺][Br⁻]²

Calculate the initial concentration of Pb²⁺ in the solution:

[Pb²⁺] = 0.2740 M

Use the common ion effect to calculate the equilibrium concentration of Br⁻ ions:

Ksp = [Pb²⁺][Br⁻]²

[Br⁻]² = Ksp / [Pb²⁺] = (6.60 × 10⁻⁶) / (0.2740) = 2.41 × 10⁻⁵

[Br⁻] = √(2.41 × 10⁻⁵) = 0.00491 M

Calculate the molar solubility of PbBr₂ using the equilibrium concentration of Br⁻ ions:

PbBr₂(s) ⇌ Pb²⁺(aq) + 2Br⁻(aq)

[PbBr₂] = Ksp / ([Pb²⁺][Br⁻]²) = (6.60 × 10⁻⁶) / (0.2740 × (0.00491)²) = 0.0547 M

Therefore, PbBr₂ has a molar solubility of 0.0547 M in a 0.2740 M Pb(NO₃)₂ solution. This calculation shows how the presence of a common ion (in this case, Pb²⁺) can affect the solubility of a slightly soluble salt (in this case, PbBr₂) through the common ion effect.

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Answer:

- Volume is a physical property of an object.

- One unit of volume is the milliliter.

- Liquids and solids have constant volumes.

Explanation:

Statement that are true about volume are;

volume can be regarded as a 3-dimensional space enclosed by a boundary or occupied by an object.

Therefore, Volume is a physical property of an objec and One unit of volume is the milliliter.

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The type of chemical reaction that typically forms peptide bonds between amino acids to create a protein is a condensation or dehydration synthesis reaction.

The atoms involved in the formation of a peptide bond are carbon, hydrogen, oxygen, and nitrogen. These atoms combine to create a peptide bond, which links the carboxyl group (-COOH) of one amino acid with the amino group (-NH₂) of another amino acid.
A triglyceride molecule is generally non-polar because it consists of three fatty acid chains attached to a glycerol molecule, and both fatty acids and glycerol are hydrophobic (non-polar) in nature.
Triglycerides are insoluble in water due to their non-polar nature. They do not form hydrogen bonds with water molecules, making them hydrophobic.
Triglycerides store a significant amount of energy. They are the primary storage form of energy in adipose tissue, providing high-energy density due to the long carbon chains in fatty acids.
The energy stored in a triglyceride molecule is higher compared to an amino acid or glucose molecule. Triglycerides have more carbon-hydrogen bonds, which store a higher amount of energy per unit mass than the shorter carbon chains in amino acids or glucose molecules. This is why triglycerides are an efficient energy storage molecule in organisms, as they can be broken down through hydrolysis to release energy when needed.

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In isoelectronic species, the species that have the least number of electrons will have the smallest radius. Therefore, K+ has the smallest radius amongst K, K+ and K-.The order of the radius of the given species can be given as follows:

K > K⁻ > K⁺

The effective nuclear charge experienced by the K atom is +1, as it has one valence electron which can shield 18 electrons. Therefore, the attraction between the valence electron and the nucleus is weak which makes the atomic size larger than that of K- and K+.

The effective nuclear charge experienced by the K-atom is +1, as it has one valence electron which can shield 17 electrons. The attraction between the valence electron and the nucleus is stronger than in K due to less screening effect by electrons. Therefore, the atomic size is smaller than that of K.

The effective nuclear charge experienced by the K⁺ atom is +1, as it has one valence electron which can shield 19 electrons. The attraction between the valence electron and the nucleus is maximum in K+ due to the absence of one electron from the 4s orbital. Therefore, the atomic size is the smallest among the given species.

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Answer:

because it is a single cell. Cell A, because a nuclear membrane contains the cell’s DNA. Cell B, because it is much smaller. Cell B, because it contains genetic material

Explanation:

Answer:

I think solids

Explanation:

sorry if its not right

Yes, the form of glycine used by the human body is D-glycine.

Only the R-group of the amino acid glycine, which includes hydrogen, lacks chirality. Many organic compounds have an inherent chirality that gives birth to a variety of isomers. Glycine is the only natural amino acid that is not chiral at the alpha carbon since R is simply a hydrogen. Four stereoisomers of MetO are possible since it has chiral sulphur and chiral carbon.

With other amino acids, the Val side chain does not create hydrogen bonds. An aliphatic amino acid is isoleucine. Its side chain is aliphatic and has the chemical formula (C4H9). Isoleucine does not create a hydrogen bond since it does not include any electronegative atoms. The thiol group is present in the structure of cysteine.

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It is not possible for two electrons to have the same set of all four quantum numbers in an atom, as it would violate the Pauli exclusion principle.

According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. The four quantum numbers used to describe an electron's state are the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s).

The principal quantum number (n) determines the energy level of an electron and can have integer values starting from 1. The azimuthal quantum number (l) determines the shape of the electron's orbital and can have values from 0 to (n-1). The magnetic quantum number (m) determines the orientation of the orbital and can range from -l to +l. The spin quantum number (s) describes the spin of the electron and can have two possible values, +1/2 or -1/2.

Since each electron in an atom must occupy a unique set of quantum numbers, they must differ in at least one of the four quantum numbers. This ensures that no two electrons have the exact same quantum state.

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the de Broglie wavelength of the electron moving at a velocity of 3. 0 × 107 m/s is 2.4×10∧-11nm

lambda = h/mv

The de Broglie wavelength is defined as follows: lambda = h/mv, wherein the greek letter lambda represents the wavelength, h is Planck's consistent, m is the particle's mass and v is its pace. One may also explicit mv as the particle's momentum

according to wave-particle duality, the De Broglie wavelength is a wavelength manifested in all the gadgets in quantum mechanics which determines the chance density of locating the item at a given factor of the configuration area. The de Broglie wavelength of a particle is inversely proportional to its momentum

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1) The speed of the particles would increase when heated

2) The balloon would expand when heated and contract when cooled.

3) On a hot day, the pressure of the gas in a beverage increases

4) The mercury thermometer works by expanding or contracting in response to temperature change.

We know that one of the effects of temperature is that it is able change the molecular motion of an object. Thus the molecules of an object are able to move faster when heat is applied and they are able to slow down when the heat is removed.

This is why a balloon would have a greater volume when the temperature is increased as the gas molecules spread out. The volume would reduce or decrease when the temperature is reduced.

Also, on a hot day, a beverage would tend to be more fuzzy as the pressure of the gas in the beverage would increase as the temperature is increased.

Lastly, when we use the mercury thermometer, the volume of the mercury would increase and this is the reason for the expansion of the mercury during temperature measurement.

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18.3 g of solid precipitate formed during the reaction.

Formula of lead(ii) perchlorate = \(Pb(ClO4)_{2}\)

Formula of  sodium sulfate = \(Na_2(SO_4)\)

Reaction of lead(ii) perchlorate and sodium sulfate

\(Pb(ClO4)_{2}\) + \(Na_2(SO_4)\)    ---------->  \(PbSO_4(s)\)    + \(2Na(ClO4)_{2}\)

moles of  \(Pb(ClO4)_{2}\)  =  \(\frac{given mass}{ Molar mass}\)

molar mass of \(Pb(ClO4)_{2}\) =207+(35.5+ 16*4)*2

molar mass of \(Pb(ClO4)_{2}\) =207+ 99.5*2

molar mass of \(Pb(ClO4)_{2}\) =406

given mass = 33.17g

moles of  \(Pb(ClO4)_{2}\)  =  \(\frac{given mass}{ Molar mass}\)    

moles of  \(Pb(ClO4)_{2}\) =  \(\frac{33.17}{406}\)  

moles of  \(Pb(ClO4)_{2}\) = 0.0817 moles

molar mass of \(Na_2(SO_4)\)  = 2*23+ 32+ 4*16

molar mass of \(Na_2(SO_4)\)  = 46+32+64

molar mass of \(Na_2(SO_4)\)  = 142

moles of      \(Na_2(SO_4)\)  =      \(\frac{given mass}{ Molar mass}\)    

moles of      \(Na_2(SO_4)\) = \(\frac{8.564}{142}\)  

moles of      \(Na_2(SO_4)\) = 0.0603 moles

since in the above reaction \(Pb(ClO4)_{2}\) is the solid precipitate so we have to find the weight of \(PbSO_4(s)\) formed after the reaction.

Given that the reaction is complete so one of the 2 reactant must completely ends since \(Na_2(SO_4)\) have less number of moles than \(Pb(ClO4)_{2}\)  so , \(Na_2(SO_4)\) will disappear and hence according to Stoichiometry  same number of moles of \(PbSO_4(s)\) will form

so number of moles of \(PbSO_4(s)\) formed = 0.0603

so, the weight of \(PbSO_4(s)\) formed = number of moles formed * molar mass of \(PbSO_4(s)\)

so weight of \(PbSO_4(s)\) formed  =0.0603 * 303

weight of \(PbSO_4(s)\) formed= 18.27 g ≈ 18.3 g

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The structural formula for acetal hydrolysis in water HCl. (View image)

This problem is based on the concept of hydrolysis. Addition of aqueous acids to acetals results in the formation of aldehydes and ketones. Acetals are derivatives of aldehydes and ketones. When a hemiacetal is subjected to nucleophilic attack by an alcohol molecule, acetal formation occurs.

When the cyclic acetal undergoes hydrolysis in the presence of an aqueous acid i.e. HCl, the formation of a ketone occurs. In this case, methanol (CH₃OH) is a by-product. The stereochemistry of the products will be the same as the reactants. If the binding is drawn on the plane of the paper, the binding that is off the page is a wedge bond. On the other hand, ties that are at the back of the page are dotted bonds.

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if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:

moles = 2

Generally, To determine the number of moles of anhydrate present, you would need to know the mass of the sample. If you have that information, you can use the formula:

moles = mass / molar mass

Where

mass is the mass of the sample in grams and

molar mass is the molar mass of the salt (in this case, 136 g/mol).

For example, if the mass of the sample is 272 grams, the number of moles of anhydrate present would be:

moles = 272 / 136

= 2

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If [AlF6]3− is dissolved in pure water, the correct answer is D. It is impossible to determine the relative concentrations of [Al3+] and [F−] solely based on the information given. Additional information about the solubility and dissociation behavior of [AlF6]3− is needed to determine the concentrations of the individual ions in the solution accurately.

The dissociation behavior of [AlF6]3− in water depends on its solubility and the strength of its interaction with water molecules. Without specific information regarding the solubility and dissociation equilibrium constant (Ksp or Kdiss) of [AlF6]3−, it is not possible to determine the relative concentrations of [Al3+] and [F−] in the solution.

The concentration of [Al3+] and [F−] in the solution will depend on factors such as the degree of dissociation of [AlF6]3− and the formation of other species or complexes in the presence of water. To accurately assess the concentrations of individual ions, additional data or information is required. Therefore, the correct answer is D, as it is impossible to determine the relative concentrations of [Al3+] and [F−] based on the given information.

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Answer:

Thiols contain stronger acids than alcohols

Explanation:

Answer:

Sulfur is a bigger atom than oxygen and has a lower electgronegativity value. Therefore, the lone pair availability in thiol is higher than alcohol

Explanation:

Answer:

Magnesium (Mg)

Explanation:

An element with a lower atomic mass than Calcium that has similar chemical property is the element Magnesium (Mg).

This because, elements in the same group or family on the periodic table has similar chemical properties.

Magnesium belongs to the same group as Calcium, other elements are:

     Be  Mg  Ca    Sr  Ba  Ra

The group is made of the alkaline earth metals. They have two valence electrons in their outer shell.

Answer:

At higher altitudes, air pressure is lower. When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude.

In an ordinary container (exposed to atmospheric pressure). The freezing point will increase with altitude (and corresponding decrease in atmospheric pressure), but the difference is very slight.

Explanation:

When at a higher altitude , the atmospheric pressure is usually low and it

requires lesser amount of energy for the water to reach its boiling point. This

means that at higher altitudes , water boils at a lower temperature.

The freezing point of water increases with a higher altitude. This means that

water freezes at a higher temperature although the difference is very small.

The low pressure present in higher altitudes increases the melting point of

water(ice)

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Answer:

the answer is B