- Molar Extinction Coefficient for [CrO4 2-]
- Average molar extinction coefficient
- Standard deviation
REPORT SHEET Determination of the Solubility-Product Constant for a Sparingly Soluble Salt A. Preparation of a Calibration Curve Initial [Crox?] 0.0024 M Volume of 0.0024 M KC704 1. 1 mL [Cro,?] Total volume 100 mL Absorbance 0.103 2.4 x 10^-5 2. 5 mL 100 mL 1.20 x 10^-4 0.453 3. 10 mL 100 mL 2.40 x 10^-4 0.854 4. 15 mL 100 mL 3.60 x 10^-4 1.10 Molar extinction coefficient for [Cro 2-1 1. 2. 3. 4. Average molar extinction coefficient Standard deviation (show calculations)

Answer:

30 cm³.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

O2 + 2H2 —> 2H2O

From the balanced equation above, we can say that:

1 cm³ of O2 reacted with 2 cm³ of H2 to produce 2 cm³ of H2O.

Next, we shall determine the excess reactant.

This can be obtained as follow:

From the balanced equation above,

1 cm³ of O2 reacted with 2 cm³ of H2.

Therefore, 10 cm³ of O2 will react with = (10 × 2)/1 = 10 × 2 = 20 cm³ of H2.

From the calculations made above, we can see that only 20 cm³ out of 50 cm³ of H2 given is needed to react completely with 10 cm³ of O2.

Therefore, O2 is the limiting reactant and H2 is the excess reactant (non limiting reactant).

Finally, we shall determine the volume of the non limiting reactant (excess react) that is remaining after the reaction.

This can be obtained as follow:

Volume of non limiting reactant (H2) = 50 cm³

Volume of non limiting reactant (H2) that reacted = 20 cm³

Volume of non limiting reactant (H2) remaining =.?

Volume of non limiting reactant (H2) remaining = (Volume of non limiting reactant) – (Volume of non limiting reactant that reacted)

Volume of non limiting reactant (H2) remaining = 50 – 20

= 30 cm³

Therefore, the Volume of non limiting reactant (H2) that remains after the reaction is 30 cm³

The pKa value for the weak acid is 4.257.

To find the pKa value, we can use the formula pKa = -log10(Ka), where Ka represents the acid dissociation constant. In this case, the given Ka value is 5.53 x 10^-5.

Taking the negative logarithm (base 10) of this value, we obtain:

\(pKa = -log10(5.53 * 10\ ^\ - 5\) ) = -log10(5.53) + log10(10\ ^ \ -5\) )\)

Using logarithmic properties, we know that log10(10^-5) is equal to -5, which simplifies the equation further:

\(pKa = -log10(5.53) - 5\)

Evaluating the logarithm, we get:

\(pKa = 4.257\)

Therefore, the pKa value for the given weak acid is 4.257, considering the appropriate significant figures.

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\(CH_3CH_2OH\) is a polar compound and has hydrogen bonding. It has a higher boiling point. It will have the lowest vapor pressure among the three compounds.

Vapor pressure is the pressure produced by the vapors of a liquid in a sealed container when the liquid is heated. It is a property of a liquid that describes the tendency of a liquid to evaporate. It is measured in units of pressure, typically in mmHg or torr. The higher the vapor pressure, the more volatile a compound is. So, the decreasing order of vapor pressure for the given compounds is: \(CH_3CH_3 > CH_3CH_2F > CH_3CH_2OH\)

Here, \(CH_3CH_3\) is a non-polar compound while \(CH_3CH_2F\) and \(CH_3CH_2OH\) are polar compounds. The polar compound has hydrogen bonding, which increases the intermolecular forces between molecules. As a result, the polar compound will have a lower vapor pressure than the non-polar compound.

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One example of two organisms and their adaptations are the polar bear and the arctic fox, both of which inhabit the harsh, icy environment of the Arctic.

The polar bear has a thick layer of insulating fur, which helps it retain body heat in the cold temperatures. It also has large paws that act like snowshoes, allowing it to move over snow and ice more easily.

The polar bear's sense of smell is also highly developed, allowing it to detect prey from far distances. These adaptations help the polar bear survive in its cold, snowy habitat by keeping it warm and aiding in its ability to hunt for food.

The arctic fox also has several adaptations that allow it to survive in the Arctic. Its fur changes color from brown in the summer to white in the winter, providing camouflage against the snow. The fox's paws are covered in fur to provide insulation and better traction on the slippery ice.

The fox's diet is also highly adaptable, allowing it to survive on a variety of prey, from lemmings to birds to fish. These adaptations help the arctic fox survive in the harsh Arctic environment by helping it blend in, move more efficiently, and find food.

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When cucumbers are immersed in a concentrated saltwater solution, the process of osmosis occurs. Osmosis is the movement of water molecules across a selectively permeable membrane from an area of high water concentration to an area of low water concentration.

In this case, the concentrated saltwater solution outside the cucumber has a much lower water concentration than inside the cucumber. As a result, water from inside the cucumber moves out of the cell membrane and into the saltwater solution, causing the cucumber to shrink.

Additionally, the salt ions from the solution enter the cucumber through the cell membrane, which is permeable to ions. The presence of salt ions in the cucumber affects the taste, making it salty. The salt also acts as a preservative, inhibiting the growth of microorganisms that can spoil the cucumber. This is why pickles have a longer shelf life than fresh cucumbers.

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Answer:

B

Explanation:

1)

methyl

CH3 (mol)

CH3- (struc)

2)

ethyl

C2H5

CH3-CH2-

3)

propyl

C3H7

CH3-CH2-CH2-

4)

butyl

C4H9

CH3-CH2-CH2-CH2-

5)

pentyl

C5H11

CH3-CH2-CH2-CH2-CH2-

6)

hexyl

C6H13

CH3-CH2-CH2-CH2-CH2-CH2-

7)

heptyl

C7H15

CH3-CH2-CH2-CH2-CH2-CH2-CH2-

8)

octyl

C8H17

i will stop writing the condensed formula ust add another CH2

9)

nonyl

C9H19

10)

decyl

C10H21

11)

Undecyl

C11H23

12)

dodecyl

C12H25

Answer:

Subatomic particles are particles that are smaller than the atom.

Protons, neutrons, and electrons are the three main subatomic particles found in an atom.

Protons have a positive (+) charge.

Neutrons have no electrical charge

Explanation:

Answer: The percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.

Explanation:

Given: Volume of solute = 120 mL

Volume of solvent = 350 mL

Now, total volume of the solution is as follows.

\(V_{total} = V_{solute} + V_{solvent}\\= 120 mL + 350 mL\\= 470 mL\)

Let us assume that 100 mL of solution is taken and the amount of isopropyl alcohol present in it is as follows.

\(\frac{V_{solute}}{V_{total}} \times 100 mL\\\frac{120 mL}{470} \times 100 mL\\= 25.53 mL\)

Hence, there is 25.53 mL isopropyl alcohol is present in 100 mL of solution. Therefore, %v/v is calculated as follows.

\(Percent (v/v) = \frac{25.53 mL}{100 mL}\\= 25.5%\)

Thus, we can conclude that the percent by volume of isopropyl alcohol in a solution made by mixing 120 mL of the alcohol with enough water to make 350 mL of solution is 25.5%.

Both isotopes (A and B) undergo beta decay. The half-life of radioactive element A is 150 days while the half-life of radioactive element B is 12.5 days.

A student obtains samples of pure quantities of two radioactive isotopes: A and B. The samples contain equal numbers of atoms. The person experiences the most exposure to radioactivity by being exposed to isotope B at a distance of one metre for two hours.The amount of radiation a person is exposed to is inversely proportional to the square of the distance from the source.

The closer you are to the source of radiation, the greater the exposure. When the source of radiation is increased from 1 m to 2 m, the amount of radiation is decreased by a factor of 4. When the time of exposure is doubled from 1 hour to 2 hours, the amount of radiation is doubled.If two isotopes of the same number of atoms are considered with half-lives of 12.5 days and 150 days, respectively, the isotope with a half-life of 12.5 days will be more radioactive.

It will have a larger decay constant and emit more beta radiation than the isotope with a longer half-life.Therefore, being exposed to isotope B at a distance of one metre for two hours would result in a person experiencing the most exposure to radioactivity.

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Answer:

Explanation:

Boiling is the rapid vaporization of a liquid, which occurs when a liquid is heated to its boiling point, the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere. There are two main types of boiling: nucleate boiling where small bubbles of vapour form at discrete points, and critical heat flux boiling where the boiling surface is heated above a certain critical temperature and a film of vapor forms on the surface. Transition boiling is an intermediate, unstable form of boiling with elements of both types. The boiling point of water is 100 °C or 212 °F but is lower with the decreased atmospheric pressure found at higher altitudes.

Boiling water is used as a method of making it potable by killing microbes and viruses that may be present. The sensitivity of different micro-organisms to heat varies. But if water is held at 100 °C (212 °F) for one minute, most micro-organisms and viruses are inactivated. Ten minutes at a temperature of 70 °C (158 °F) is also sufficient for most bacteria.

Boiling water is also used in several cooking methods including boiling, steaming and poaching.

Answer:

2.24g/

Explanation:

mass of water is found by getting 5he extra mass the cylinder gained after adding

100g-80g=20g - mass of water

Density of water: 1g/cm³ that means that 20g water has a volume of 20cm³

1cm³=1ml; 20cm³=20ml

volume of stone is the extra height the water gained: 45ml-20ml =

25ml

mass of stone is the extra mass now earned:

156g-100g=56g

Density of stone=mass of stone÷divide by volume of stone

56g÷25ml=

2.24g/ml

Explanation:

by adding some technique ex. to make the item easier for use, more convenient, more benefits than regular items.

While an element on the periodic table does not automatically qualify as a mineral, there are cases where a mineral can contain an element. In this context, it is important to consider the distinction between elements and minerals in geology. Elements are pure substances composed of atoms of the same type, while minerals are naturally occurring inorganic substances with a specific chemical composition and crystal structure.

In geology, minerals are defined as naturally occurring inorganic substances with a specific chemical composition and crystal structure. While elements themselves are not considered minerals, there are instances where minerals contain a single dominant element.

One such example is the mineral gold (Au), which consists entirely of the element gold. Gold meets the criteria of a mineral as it is naturally occurring, has a specific chemical composition (Au), and possesses a crystalline structure. Therefore, gold can be classified as both an element and a mineral.

It is essential to note that not all elements can be classified as minerals. For example, gases like oxygen (O2) or elements that exist in an amorphous state, such as liquid mercury (Hg), do not exhibit the necessary crystalline structure to be considered minerals.

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The number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

To determine the number of molecules in a 37.93 gram sample of magnesium nitrate, you would need to know the molar mass of the compound. Magnesium nitrate has a molar mass of 148.31 g/mol.

we can use the formula:

Number of moles = mass (in grams) / molar mass (in g/mol)

Number of moles = 37.93 g / 148.31 g/mol = 0.2568 mol Avogadro's number (6.022x10^23) is the number of atoms, ions, or molecules in one mole of a substance. Therefore, the number of molecules in 37.93g of magnesium nitrate will be : 0.2568 mol * 6.022x10^23 molecules/mol = 1.55x10^24 molecules.

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Answer:

yes mass conservation is in 2Na+2H2O=2NaOH+H2​

Explanation:

it tells how many atoms or molecules of a reactant or a product take part in the reaction

The molarity of the lithium chloride solution is 0.671 M.

Molarity is a unit of concentration used to measure the amount of solute dissolved in a given volume of solution. It is defined as the number of moles of solute dissolved in one liter of solution, and its unit is moles per liter (mol/L).

To calculate the molarity of the solution, we need to divide the number of moles of solute by the volume of solution in liters.

Molarity = moles of solute/volume of solution in liters

In this case, we are given that 1.59 mol of lithium chloride is dissolved in enough water to make 2.37 L of solution. Therefore, the molarity will be calculated as

Molarity = 1.59 mol / 2.37 L

Molarity = 0.671 M

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Answer:

I think it's C or D Sorry if I'm Wrong

Explanation:

it just makes the most sense to me

Answer: C

Explanation: Just took the test on a.p.e.x.

Answer:

O C. Metallic bonds hold metal atoms and freely moving valence electrons together, while Van der Waals forces hold nonpolar molecules together.

Explanation:

The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

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Answer:

Mass of lime produced = 19.0 g

Explanation:

Given data:

Mass of lime produced = 11.2 g

Mass of limestone react = ?  

Solution:

Chemical equation:

CaCO₃     →      CaO + CO₂

Balanced chemical equation:

CaCO₃     →      CaO + CO₂

Number of moles of lime:

Number of moles = mass / molar mass

Molar mass of lime 56.1 g/mol

Number of moles = 11.2 g/ 56.1 g/mol

Number of moles = 0.19 mol

Now we will compare the moles of CaO and CaCO₃  from balance chemical equation.

                    CaO        :           CaCO₃

                      1             :             1

                     0.19          :          0.19

Mass of limestone react:

Mass = number of moles × molar mass

Mass = 0.19 mol × 100.1 g/mol

Mass = 19.0 g

Answer:3

Explanation:

it is b

Answer:

The correct answer is . . . "B" .

♡ ( i just got the answer from that other dude- ) ♡

Explanation:

Answer:

closely related

Explanation:

Answer:

= - 303.975 Joules

Explanation:

Given that:

The volume of the cylinder = 0.003 m^3

Now, to liters:

The volume = 0.003 *1000 L

= 3 L

For an open cylinder, we mean the atmospheric pressure is at standard condition.

Thus, the workdone = -PΔV

= - 1 atm (3 L)

= - 3 L atm

1 L atm to Joules

= 101.325 Joules

Therefore;

=- 3* 101.325 Joules

= - 303.975 Joules

The correct answer of the question of Isotope is option c) Atom 1: nucleus with 92 protons and 143 neutrons, 92 electrons and Atom 2: nucleus with 92 protons and 146 neutrons, 92 electrons .

They are isotopes because while each atom has the same atomic number, its atomic mass varies. a radioactive form of an element, as well as any other two or more forms of the same element that have varying numbers of neutrons in their nuclei but equal amounts of protons overall. These forms differ in relative atomic mass but not in chemical characteristics. The terms "radioisotope" and "radionuclide" refer to isotopes that have been observed to decay radioactively, while "stable isotope" and "stable nuclide" refer to isotopes that have not been observed to decay radioactively. In spite of the periodic table only allowing for 11 elements between lead and uranium inclusive, the radiochemist Frederick Soddy first hypothesized the existence of isotopes in 1913. His hypothesis was based on studies of radioactive decay chains that revealed about 40 different species known as radioelements between uranium and lead.

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Complete Question

Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?

A)Atom 1: nucleus with 6 protons and 8 neutrons,  6 electrons

Atom 2: nucleus with 7 protons and 8 neutrons, 7 electrons

B)Atom 1: nucleus with 8 protons and 8 neutrons,  8 electrons

Atom 2: nucleus with 8 protons and 8 neutrons, 7 electrons

C)Atom 1: nucleus with 92 protons and 143 neutrons, 92 electrons

Atom 2: nucleus with 92 protons and 146 neutrons, 92 electrons

D)Atom 1: nucleus with 1 proton and 0 neutrons, 1 electron

Atom 2: nucleus with 2 protons and 2 neutrons, 2 electrons

E)Atom 1: nucleus with 4 protons and 5 neutrons,  4 electrons

Atom 2: nucleus with 5 protons and 5 neutrons, 4 electrons

Answer:

Na

Explanation:

Reactant side:

1 Na

1 Mg

2 F

Product side:

2 Na

1 Mg

2 F

There is one more Na atom on the product side than the reactant side. To balance this, multiply the Na on the reactant side by 2.

Answer:

C. read the label on the container

Explanation:

What information is found in an SDS? Check all that apply.

A. the identification of the chemical

C. the chemical and physical properties of the substance

D. the first-aid measures to take if an accident occurs involving the chemical

Answer:

C

Explanation:

just did it

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 54 g

volume = 20 cm³

Substitute the values into the above formula and solve for the density

That's

We have the final answer as

Hope this helps you