Which of the following statements related to gas chromatography (G) is false? You can assume
that a flame ionization detector (FID) is used. a. If an internal standard is not used, compounds are identified on the GC chromatogram
by their absolute retention time. b. If an internal standard is used, compounds are identified on the GC chromatogram by
their relative retention times (i.e., relative to the internal standard). c. The use of an internal standard can minimize analytical error associated with fluctuating peak areas (e.g., due to varying split injection ratios, varying FID make up gas flows,
etc.).
d. A combustible gas like hydrogen or methane is usually used as the GC carrier gas. e. If a mass spectrometer (MS) were used instead of an FID, compound peaks on the GC chromatogram could be positively identified by their unique molecular fragmentation
pattern (instead of relying on retention time for peak identification).

The number of molecules 5.87 ×10¹⁹ molecules. 12 mg (i.e 0.012 g) of C₆H₅NO₂ contains 5.87 ×10¹⁹ molecules.

Mass of C₆H₅NO₂ = 12 mg

Number of molecules of C₆H₅NO₂ =?

The next step is to change 12 mg to g.

1 mg = 10¯³ g

Therefore,

12 mg = 12 mg × 10¯³ g / 1 mg

12 mg = 0.012 g

We will then calculate the mass of 1 mole of C₆H₅NO₂.

1 mole of C₆H₅NO₂ = (12×6) + (5×1) + 14 + (16×2)

= 72 + 5 + 14 + 32

= 123 g

We will count the molecules in 12 mg (or 0.012 g) of C₆H₅NO₂.

From Avogadro's hypothesis,

1 mole of C₆H₅NO₂ = 6.02×10²³ molecules

123 g of C₆H₅NO₂ = 6.02×10²³ molecules

Therefore,

0.012 g of C₆H₅NO₂ = 0.012 × 6.02×10²³ / 123

0.012 g of C₆H₅NO₂ = 5.87 ×10¹⁹ molecules.

Thus, 12 mg (i.e 0.012 g) of C₆H₅NO₂ contains 5.87 ×10¹⁹ molecules.

To know more about molecules, visit:

https://brainly.com/question/26044300

#SPJ1

Answer:

True

Explanation:

Whenever something loses thermal energy, it contracts and becomes smaller.

Answer: it might be true

Explanation:

The hydrolysis of the given acetal, H₂C(CH₃)(OCH₃)CH₃, in aqueous HCl results in the formation of two organic products: 2-methoxy-2-methylpropane and methanol.

The hydrolysis of an acetal involves the cleavage of the acetal bond and the formation of two separate organic compounds. In this case, the given acetal H₂C(CH₃)(OCH₃)CH₃ will undergo hydrolysis in aqueous HCl.

The hydrolysis of the acetal bond leads to the formation of 2-methoxy-2-methylpropane and methanol as the organic products. The structural formula for 2-methoxy-2-methylpropane can be represented as CH₃CH(OCH₃)CH₃, where the oxygen atom of the acetal is now bonded to the central carbon atom. The structural formula for methanol remains as CH₃OH.

To indicate stereochemistry, wedge/hash bond tools can be used. For example, if there is a chiral center in the acetal, the stereochemistry of the resulting products can be shown by using wedges and hashes to depict the spatial arrangement of the substituents around that chiral center.

In summary, the hydrolysis of the given acetal in aqueous HCl yields 2-methoxy-2-methylpropane and methanol as the organic products. The structural formulas for these compounds can be represented, considering the stereochemistry where applicable, using wedge/hash bond tools.

Learn more about methanol here:

https://brainly.com/question/3909690

#SPJ11

Answer:

A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid fully dissociates into its ions in water. At the same concentration, weak acids have a higher pH value than strong acids.

Explanation:

:)

Answer:

Explanation:

Rust used to be a very common reaction. Iron was used in autos and they formed oxides of iron or rust as the auto or truck aged. You can still see this in older vehicles, especially those used in the country.

To make wine from grapes, the grapes need to ferment which is a process where the grape just changes to alcohol or sometimes vinegar, depending on how the grapes ferment. You can certainly tell the difference between grape juice, wine an vinegar when you taste them. A chemical reaction has taken place.

Answer: NOT a base

Explanation: i just took the exam and got this one wrong but i donno the correct answer between the last 3 good luck bb

Answer:

A catalyst

Explanation:

Catalysts make reaction faster and speed up the reaction time.

Answer:

mass=279grams

Explanation:

GIVEN DATA

number of atoms=3.01×10^23

avogadro's number=6.022×10^22

molar mass of iron=56g/moles

TO FIND

mass in gram of iron=?

SOLUTION

by using the formula

mass in gram=(number of atoms÷avogdro's number)×molar mass

mass=(3.01×10^23÷6.022×10^23)×56

mass=0.499×56

mass=27.9grams=28 grams

Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. Not all metal ions give flame colors. For Group 1 compounds, flame tests are usually by far the easiest way of identifying which metal you have got.

Answer:

The answer to the question is Mercury.

Answer:

Mercury

Explanation:

The planet to the left of A is mercury it is on the 4 row outside the asteroid belt

If an object's mass is 70 g, and its volume is 10cm cubed,  its density is 7 centimeter cube.

The density of any solid substance is the unit of the area occupied by it in per centimeter of the cube of the volume in the given sample and calculated by dividing the mass and the volume of the compound unit will be centimeter cube.

The mass of the given object is 70 gram and the volume is given is 10 cm to find the density,

                       Density = mass of object / volume of object

substituting the value in the formula,

                 Density = 70 / 10

                 Density = 7 centimeter cube.

Therefore, the density of the given object will be 7 centimeter cube if  an object's mass is 70 g, and its volume is 10cm cubed.

Learn more about density, here:

https://brainly.com/question/15164682

#SPJ2

The volume of ammonia would be produced by this reaction if of hydrogen were consumed the extent of ammonia that could be produced with the aid of using this response if 6.9 m3 of hydrogen had been fed on is 4,600.064cm³.

Read more about the ammonia gas:

https://brainly.com/question/7982628

#SPJ4

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

Learn more about lattice energy from the given link:

https://brainly.com/question/29735933

#SPJ11

The true statements regarding the greenhouse effect are:

The greenhouse effect is a natural process that occurs when certain gases in the atmosphere, known as greenhouse gases, trap heat from the sun and prevent it from escaping back into space. This helps to keep the Earth's surface warm enough to support life. However, human activities, such as burning fossil fuels, have increased the concentration of greenhouse gases in the atmosphere, which has led to an enhanced greenhouse effect and global warming.

In the greenhouse effect, not all energy from the sun is absorbed by atmospheric gases. Rather, some of it is reflected back into space by the atmosphere. Additionally, the greenhouse effect does not change sunlight into carbon dioxide; rather, it is the burning of fossil fuels and other human activities that release carbon dioxide into the atmosphere. Options B, C and E are correct.

To know more about the Greenhouse effect, here

https://brainly.com/question/29000016

#SPJ4

With 35.0 mL of a 0.1 M HCl solution neutralizing 25.0 mL of the NaOH solution, we find that the moles of NaOH are equal to the moles of HCl. Using this information, we calculate the molarity of NaOH to be 0.14 M.

To determine the concentration of the NaOH solution, we can use the concept of stoichiometry and the volume and concentration of the HCl solution used in the neutralization reaction. The balanced chemical equation for the reaction between HCl and NaOH is:

HCl + NaOH → NaCl + \(H_{2} O\)

From the equation, we can see that the mole ratio between HCl and NaOH is 1:1. This means that the number of moles of HCl used in the reaction is equal to the number of moles of NaOH present in the solution.

Given that it takes 35.0 mL of a 0.1 M HCl solution to neutralize 25.0 mL of the NaOH solution, we can use the equation:

Moles of HCl = Molarity of HCl × Volume of HCl solution

Moles of NaOH = Moles of HCl

Molarity of NaOH = Moles of NaOH / Volume of NaOH solution

Substituting the given values:

Moles of HCl = 0.1 M × 35.0 mL = 3.5 mmol

Moles of NaOH = 3.5 mmol

Volume of NaOH solution = 25.0 mL = 0.025 L

Molarity of NaOH = (3.5 mmol) / (0.025 L) = 140.0 mmol/L = 0.14 M

Therefore, the concentration of the NaOH solution is 0.14 M.

Learn more about molarity here:

https://brainly.com/question/31545539

#SPJ11

Answer:

How do the water molecules closest to the burner compare to the water molecules closest to the surface of the liquid? ... They are closer together and moving slower than those at the surface. They are more spread out and moving faster than those at the surface. The diagram shows the sun's interior.

Explanation:

Answer:

it's c if u don't want to read all that

Explanation:

The optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can have serious consequences on physiological processes. The body employs three mechanisms to control pH: buffers, respiratory regulation, and renal regulation. Blood plays a crucial role in maintaining pH homeostasis by utilizing these mechanisms.

The optimum pH range for blood is tightly regulated between 7.35 and 7.45. If the blood pH deviates from this range, it can disrupt normal physiological processes. For example, if the blood becomes too acidic (pH below 7.35), a condition called acidosis occurs.

Acidosis can lead to impaired enzyme function, decreased oxygen delivery to tissues, and disruption of the central nervous system. On the other hand, if the blood becomes too alkaline (pH above 7.45), a condition called alkalosis occurs. Alkalosis can result in muscle twitching, confusion, and even seizures.

To maintain the pH within the optimal range, the body employs three primary mechanisms: buffers, respiratory regulation, and renal regulation. Buffers are chemical substances that can accept or donate hydrogen ions to resist changes in pH. They can bind excess hydrogen ions when blood becomes acidic or release hydrogen ions when blood becomes alkaline.

The respiratory system regulates pH by adjusting the levels of carbon dioxide (\(CO_{2}\)) in the blood through changes in breathing rate and depth. By altering the amount of \(CO_{2}\), the body can regulate the concentration of carbonic acid (\(H_{2}\)\(CO_{3}\)) and thus control pH. The kidneys play a crucial role in long-term pH regulation by selectively reabsorbing or excreting bicarbonate ions (\(HCO_{3}\)-) and hydrogen ions (H+) in the urine.

Hence, the optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can lead to acidosis or alkalosis, disrupting physiological processes. The body controls pH through buffers, respiratory regulation, and renal regulation. Buffers resist pH changes, the respiratory system regulates \(CO_{2}\) levels to control carbonic acid concentration, and the kidneys selectively reabsorb or excrete bicarbonate and hydrogen ions to maintain pH homeostasis.

Learn more about pH

https://brainly.com/question/12609985

#SPJ11

Hydration is a specific example of the phenomenon known generally as a. solvation

The act of hydrating involves combining or dissolving an object in water. It is a particular instance of the more general phenomena known as solvation, which is the process by which solvent molecules surround and scatter a solute to create a homogeneous solution. However, hydration explicitly refers to solvation with water as the solvent.

Solvation may also happen with solvents other than water. Solvation is the process through which a solute and solvent interact to stabilise a solute species. Due to its impact on the solubility, reactivity, and behaviour of compounds in solution, solvation is a crucial mechanism in many chemical and biological processes.

Read more about solvation on:

https://brainly.com/question/530845

#SPJ4

Answer:

Answer: Reaction Rate

Explanation:

reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time.

ANSWER

7 moles of MgO was produced during the reaction

EXPLNATION

Given that;

The number of moles of oxygen is 3.5 moles

Follow the steps below to find the number of moles of MgO

Step 1; Write a balanced equation of the reaction

In the equation above 2 moles Mg react with 1 mole oxygen to produce 2 moles MgO

Step 2; Find the number of moles of MgO using a stoichiometry ratio

Let x represents the number of moles of MgO

Therefore, 7 moles of MgO was produced during the reaction

The measured quantity 0.0105 L has three significant figures. Significant figures are the digits in a measurement that convey precision, excluding leading zeros and trailing zeros without a decimal point.

In the measured quantity 0.0105 L, there are three significant figures. Significant figures are the digits in a measurement that indicate the precision and reliability of the value. The general rule for determining significant figures is as follows:

1. Non-zero digits are always significant. In this case, the digits "1", "0", and "5" are all non-zero and therefore significant.

2. Leading zeros (zeros at the beginning of a number) are not significant; they act as placeholders. In this measurement, the leading zero before the decimal point is not considered significant.

3. Zeros between significant digits are significant. There are no zeros between the significant digits "1", "0", and "5" in this case.

4. Trailing zeros (zeros at the end of a number) after a decimal point are significant. In this measurement, the trailing zero after the "5" is significant.

By applying these rules, we can determine that the measured quantity of 0.0105 L has three significant figures, representing the precision of the measurement to the hundredth place.

learn more about measured quantity here:

https://brainly.com/question/29135463

#SPJ11

The first step in calculating the concentration of oxygen(g) in ppm is to convert the mass of oxygen(g) to moles. This can be done by dividing 0.008g by the molar mass of oxygen(g), which is 32 \(\frac{g}{mol}\). This gives us 0.00025 moles of oxygen(g).

Next, we need to calculate the mass of the solvent, which is water in this case. 1000 grams of water is equivalent to 1 kilogram or 1 liter of water.
Now we can use the definition of ppm, which is parts per million, to calculate the concentration of oxygen(g) in the solution. One part per million is equal to one milligram of solute per liter of solution. Since the mass of oxygen(g) in this solution is 0.008g and the volume of the solution is 1 liter, the concentration of oxygen(g) in ppm can be calculated as follows:
\(\frac{0.008g}{1,000,000 mg * 1,000,000}\) = 8 ppm
Therefore, the concentration of oxygen(g) in ppm in this solution is 8 ppm.

Learn more about molar mass here:

https://brainly.com/question/12127540

#SPJ11

Answer:

Answer a is the best way for gas b

The ratio of the mass of compounds:

a. 2Na + Cl\(_{2}\) → 2NaCl = 46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8

What is a  molecular mass?

Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.

Calculation:

a. 2Na + Cl\(_{2}\) → 2NaCl

(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)

(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)

46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH

(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)

(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)

2 : 16 + 23 : 16 → 46 : 32 : 2

1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O

(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)

(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)

1 : 35 + 23 : 35 → 23: 35 + 2: 16

1 : 35 + 23 : 35 → 23 : 35 + 1: 8

Learn more about mass ratio here,

https://brainly.com/question/19327306

#SPJ4

Answer:

a

Explanation:

becuase it make cents

The grams of lactose needed when to make 3.4 l of an isotonic solution of lactose (c12h22o11) is 325.869 g

Isotonic solution: solute (lactose) concentration is equal to the solute concentration in blood cells and is 0.28 mol/L

Therefore the concentration of Lactose solution should be 0.28mol/L.

Mole = Volume × molarity

Mole of Lactose = 3.4L × 0.28mol/L = 0.952 moles.

Mass of Lactose = mole × molar mass = 0.952mol × 342.3g/mol = 325.869g = 325.869 g .

So, 325.869 g of Lactose is required.

To learn more about isotonic solutions visit:

brainly.com/question/28020628

#SPJ4

Answer:

F,A

Explanation:

Answer:

72.14878 grams

Explanation:

The pressure in the compartment would be approximately 52.29 atmospheres

The ideal gas law equation can be applied here: PV = nRT

where P is the pressure (in atmospheres or Pascals).

Volume (measured in litres)

The number of moles is n.

R = 0.0821 L atm/mol K, the ideal gas constant.

Temperature (in Kelvin) equals T.

The provided temperature must first be converted from Celsius to Kelvin:

T(K) equals T(°C) plus 273.15 K = 45.0 + 273.15 K = 318.15 K

We may rearrange the ideal gas law equation to solve for pressure if the volume is 0.050 L, we want to determine the pressure, and we have the same number of moles of N2 as in the prior situation.

P = (nRT) / V

P = (1 mol * 0.0821 L atm/mol K * 318.15 K) / 0.050 L P = 52.29 atm is the result of substituting the variables.

Consequently, 52.29 atmospheres would be the compartment's pressure.

for more questions on Pressure
https://brainly.com/question/24719118
#SPJ8