Question 7.7. All amino acids have a central carbon with four components attached to it. One of these components is called the R-group. Which of the following best describes the R-group? (Points : 3)
The R-group helps the amino acid replicate.
The R-group gives the amino acid unique characteristics.
The R-group is the same in all amino acids.
The R-group is what stabilizes the amino acid.

Answer: The products formed are potassium nitrate [tex](KNO_3)[/tex] and silver bromide ( AgBr ).

Explanation: Double replacement or double displacement reactions are the reactions in which the positive ions and negative ions of the two reactants interchange to form the products. These reactions are carried out on the basis of their position in reactivity series.

The elements lying above in the reactivity series will be able to displace the elements that lie below in the reactivity series.

For the reaction of potassium bromide and silver nitrate, the reaction follows:

[tex]KBr(aq.)+AgNO_3(aq.)\rightarrow AgBr(s)+KNO_3(aq.)[/tex]

The resulting products are potassium nitrate [tex](KNO_3)[/tex] and silver bromide ( AgBr ).

The abbreviation for carbon dioxide is CO₂, which represents its chemical composition of one carbon atom and two oxygen atoms.

The abbreviation for carbon dioxide is CO₂. This is derived from the chemical formula for carbon dioxide, which includes one carbon atom (C) and two oxygen atoms (O₂). This formula reflects the compound's composition and is used commonly in chemistry to denote different substances.

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The artifact was made approximately 1866 years ago.

To solve this problem, we can use the formula for exponential decay:

[tex]\[ N = N_0 \left( \frac{1}{2} \right)^\frac{t}{T_{1/2}} \][/tex]

Where:

- [tex]\( N \)[/tex] is the final amount of the substance (in this case, the remaining amount of carbon-14 in the artifact).

- [tex]\( N_0 \)[/tex] is the initial amount of the substance (in this case, the amount of carbon-14 in living trees).

- [tex]\( t \)[/tex] is the time that has passed (in years).

- [tex]\( T_{1/2} \)[/tex] is the half-life of the substance (in this case, 5730 years).

Given that the wooden artifact contains 80% of the carbon-14 present in living trees, we can set up the equation as follows:

[tex]\[ 0.80N_0 = N_0 \left( \frac{1}{2} \right)^\frac{t}{5730} \][/tex]

Now, we can solve for t, the time that has passed:

[tex]\[ \left( \frac{1}{2} \right)^\frac{t}{5730} = 0.80 \][/tex]

Taking the natural logarithm of both sides to isolate the exponent:

[tex]\[ \frac{t}{5730} \ln \left( \frac{1}{2} \right) = \ln(0.80) \][/tex]

[tex]\[ \frac{t}{5730} = \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]

[tex]\[ t = 5730 \times \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]

[tex]\[ t \approx 1865.896 \, \text{years} \][/tex]

Rounding to the nearest whole number, we get:

[tex]\[ t \approx 1866 \, \text{years} \][/tex]

Therefore, the artifact was made approximately 1866 years ago.

Answer:

The complete and balance the equation for this reaction in acidic solution is given by:

[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]

Explanation:

Oxidation reaction of chromium to chromate in acidic medium:

[tex]Cr\rightarrow CrO_4^{2-}[/tex]

Add 4 molecules of water on the left hand side to balance the oxygen:

[tex]Cr+4H_2O\rightarrow CrO_4^{2-}[/tex]

Now balance hydrogen atoms by adding hydrogen ions on opposite to the side where water molecule are present .

[tex]Cr+4H_2O\rightarrow CrO_4^{2-}+8H^+6e^-[/tex]....[1]

In last, to balance the charge on the both sides add electrons to sides where positive charge is more.

Reduction reaction of silver ions to silver in acidic medium:

[tex]Ag^++e^-\rightarrow Ag[/tex]..[2]

By [1] + 6 × [2] , we will get the balance equation for this reaction in acidic solution:

[tex]Cr+4H_2O+6Ag^++6e^-\rightarrow CrO_4^{2-}+8H^+6e^-+6Ag[/tex]

[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]

The density of solid W is 19.3 g/cm³. To find the number of atoms per cm³, we calculate the volume of one unit cell of W and then multiply by the number of unit cells. The volume of one unit cell is found using the formula for the volume of a cube. The edge length of a unit cell is 3.165 Å.

The density of solid W is given as 19.3 g/cm³. To calculate the number of atoms per cubic centimeter of W, we need to know the volume of one W atom. Since W adopts a body-centered cubic unit cell, each unit cell contains 2 atoms (1 atom in the center and 8 atoms at each corner). The volume of one unit cell can be calculated using the formula for the volume of a cube: volume = edge length³. Given that the edge length is 3.165 Å, we can convert it to cm and calculate the volume of one unit cell. Once we have the volume of one unit cell, we can calculate the number of unit cells per cubic centimeter of W.

The volume of one unit cell of W is (3.165 Å)³ = 31.152 ų. Converting this to cm³ gives us 3.1152 x 10⁻²³ cm³. To find the number of unit cells per cm³, we take the reciprocal of the volume of one unit cell: 1/(3.1152 x 10⁻²³ cm³) = 3.2054 x 10²² unit cells/cm³. Since each unit cell contains 2 atoms, the number of atoms per cm³ can be calculated by multiplying the number of unit cells by 2: 3.2054 x 10²² x 2 = 6.4108 x 10²² atoms/cm³.

The volume of one unit cell is given by the formula volume = edge length³. In this case, the edge length is 3.165 Å. To find the volume of one unit cell in cm³, we need to convert the edge length from Å to cm: 3.165 Å = 3.165 x 10⁻⁸ cm. Now, we can calculate the volume of one unit cell: (3.165 x 10⁻⁸ cm)³ = 3.1152 x 10⁻²³ cm³. The edge length of a unit cell is 3.165 Å, or 3.165 x 10⁻⁸ cm.

Answer: The correct answer is saturated solution.

Explanation:

For the given options:

Dilute solutions are defined as the solutions in which solute particles are present in less very amount than the solvent particles.

Unsaturated solutions are defined as the solutions where more and more of solute particles can be dissolved in the given amount of solvent.

Saturated solutions are defined as the solutions where no more solute particles can be dissolved in the solvent.  The concentration of the solute particles that can be dissolved in a solution is maximum.

Supersaturated solutions are defined as the solutions where more amount of solute particles are present than the solvent particles.

From the above information, we conclude that the given solution is saturated solution.

Answer:

The correct answer is saturated

Explanation:

Hello!

Let's solve this!

Diluted solutions are when you have more solvent than solute.

The saturated solution is when it has the same amount of solute as of solvent.

The unsaturated solution is the solution in which the solvent can still receive more solute.

The supersaturated solution is when it has more solute than the one that can dissolve the solvent.

Then the correct answer is saturated where the solvent already has the maximum amount of solute that can dissolve.

Avogadro's number  is the number of units (atoms, molecules) in 1 mole of substance:

Answer: False

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

[tex]pH=-\log [H^+][/tex]

[tex]pOH=-\log[OH^-][/tex]

When the concentration of [tex][H^+]=[OH^-][/tex], the solution is neutral, [tex]H^+[/tex]> [tex]OH^-[/tex] , the solution is acidic and if [tex]H^+[/tex]< [tex]OH^-[/tex] , the solution is basic.

Final answer:

The astronomical unit (AU) is the most appropriate unit to represent the distance between an Earth-orbiting space station and Neptune.

Explanation:

The most appropriate unit of astronomical distance to represent the distance between an Earth-orbiting space station and Neptune is the astronomical unit (AU). The AU is defined as the average distance from Earth to the Sun and is approximately 150 million kilometers or 93 million miles. It provides a convenient scale for measuring distances within our solar system, avoiding the use of very large numbers that would be involved if the kilometer were used instead. When discussing the distance between Neptune and an orbiting space station, it's important to remember that Neptune is about 30 AU from the Sun. This puts it at a vastly greater distance from the orbiting space station than the Moon or even other planets within the inner solar system.

Answer:

A covalent bond is present between two non-metals that share electrons in their molecular structure.

Explanation:

Examples of covalent bonds may be between carbon dioxide or water. And there may be three types of covalent bonds such as ionic, covalent and polar. In the first type, there is a transfer of an electron resulting in a gain for one of the atoms. In the second type, there is a sharing of electrons between the atoms. The third type is characterized by a difference in electronegativity between atoms.

Answer: carbon and oxygen share pairs of valence electrons

Explanation: its self explanatory

In the Periodic Table, a set of properties repeats from group to group, not element to element, column to column, or row to row. This is because elements in the same group have the same number of valence electrons.

In the context of the Periodic Table, a set of properties repeats not from element to element, or column to column, or row to row, but actually from group to group. This is because elements in the same group or column of the periodic table have the same number of electrons in their outer orbitals (Valence Electrons). This concept is known as periodicity. For instance, all elements in Group 1 (alkali metals) are very reactive metals because they each have one electron in their outermost shell.

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Answer:

C.) balance in number of electrons and protons.

Explanation:

Its the right answer i swear!!!

Answer:

This took me a really long time I hope you like it ;]

Drawn by a marker

Explanation: