Why must sugars and fatty acids be derivatized before GC analysis, while pesticides and aroma compounds need not be derivatized?

Answer:

a) Order of a reaction is always a whole number

Explanation:

Order of a reaction is not always whole number. It can be zero, or fractional .

Answer:

Melting

Explanation:

When solid ice gains heat, it changes state from solid ice to liquid water in a process called melting. Ice cubes in a cold drink, for example, gradually melt.

Answer:

B. vibrate rapidly

Explanation:

Mark above answer as BRILLIANT

Answer:

To make proteins....

It is used to make amino acids in our body which in turn make proteins.

Explanation:

hope it was helpful.....

According to molar concentration, the molarity of calcium chloride solution is 0.858 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Substitution in the first formula, gives 429/110.98×1/4.5=0.858 M.

Thus, the molarity of solution is 0.858 M.

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The balanced equation for carbon reacting with oxygen to form carbon dioxide is C + O2 → CO2In this reaction, carbon reacts with oxygen to form carbon dioxide.

The elements carbon (C) and oxygen (O2) are the reactants, and the product formed is carbon dioxide (CO2).To balance this equation, you need to make sure that the number of atoms on both sides of the equation is the same.

In this case, there is only one atom of carbon and two atoms of oxygen on the left side of the equation and one atom of carbon and two atoms of oxygen on the right side of the equation. To balance the equation, you can add a coefficient of 2 in front of carbon dioxide (CO2). This will give you the balanced equation 2C + O2 → 2CO2

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The given statement "Order of the reaction can be determined by looking at the coefficients in the balanced chemical equation for the reaction" is false. Because order of a reaction cannot be determined solely by looking at the coefficients in the balanced chemical equation. Option B is correct.

The order of a reaction can only be determined experimentally by measuring the rate of the reaction under different conditions, such as changing the concentrations of reactants or changing the temperature.

The rate equation obtained experimentally may or may not have the same stoichiometric coefficients as the balanced chemical equation. Therefore, it is not always possible to determine the order of the reaction based solely on the balanced chemical equation.

Hence, B. False is the correct option.

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Esters are the moderate deactivating group having substitution at meta position.

An ester is defined as a compound derived from an acid in which the hydrogen atom of at least one acidic hydroxyl group of that acid is replaced by an organyl group. It is derived from oxygen replaced by other chalcogens belong to the ester category as well Esters function as moderate deactivating groups and will direct substitution at meta positions. The first nitro group will be directed to the position meta to the ester group. This group is a severe deactivating group and will also direct substitution to the meta positions. The second nitro group will be directed to the position meta to both the ester group and the nitro group.

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Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

We know that an atom is the smallest particle of a substance that can take part in a chemical reaction. A compound is formed by a mixture of atoms. An element is obtained as the smallest independent part of a substance.

Now let use classify the samples shown in the images attached.

Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

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A graduated cylinder

_________________

o0o0o0o0o0o0o0o0o0

The balanced equation becomes: 2Ca + 2H2O -> 2Ca(OH)2 + 2Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3
Now, the equation is balanced with equal numbers of atoms on both sides.

The given equation is: Ca + H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3

To balance the equation, we need to ensure that the number of atoms on both sides of the equation is equal.

First, let's balance the calcium (Ca) atoms. There is one Ca atom on the left side and two Ca atoms on the right side. To balance this, we need to put a coefficient of 2 in front of Ca on the left side.

The balanced equation becomes: 2Ca + H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3

Next, let's balance the hydrogen (H) atoms. There are two H atoms in H2O and two H atoms in H2SO4 on the left side. On the right side, there are four H atoms in Ca(OH)2 and three H atoms in HNO3. To balance this, we need to put a coefficient of 2 in front of H2O on the left side.

The balanced equation becomes: 2Ca + 2H2O -> Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3

Now, let's balance the oxygen (O) atoms. There are four O atoms in Ca(OH)2 on the right side. To balance this, we need to put a coefficient of 2 in front of Ca(OH)2 on the right side.

The balanced equation becomes: 2Ca + 2H2O -> 2Ca(OH)2 + Al(NO3)3 + H2SO4 -> Al2(SO4)3 + HNO3

Finally, let's balance the aluminum (Al) atoms. There is one Al atom on the right side. To balance this, we need to put a coefficient of 2 in front of Al(NO3)3.

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A two-year degree program that emphasizes natural science, engineering, and mathematics is known as an associate of science (A.S.) degree.

This educational qualification provides a foundation in scientific principles and prepares students for further studies or entry-level positions in STEM-related fields. It offers a broad range of courses in disciplines such as physics, chemistry, biology, computer science, and mathematics.

An associate of science (A.S.) degree is a two-year undergraduate program that focuses on natural science, engineering, and mathematics. It is designed to provide students with a solid understanding of scientific principles, analytical skills, and problem-solving abilities.

The curriculum typically includes a combination of general education courses and specialized coursework in disciplines such as physics, chemistry, biology, computer science, and mathematics.

The associate of science degree offers a pathway for students interested in pursuing careers in STEM (Science, Technology, Engineering, and Mathematics) fields or continuing their education at a four-year college or university.

It provides a strong foundation in the core concepts and methodologies of the natural sciences, engineering principles, and mathematical reasoning. Graduates of an associate of science program may seek employment in various entry-level positions in industries such as healthcare, technology, research, or engineering.

Alternatively, they can transfer their credits to a four-year institution to pursue a bachelor's degree in a related field.

In summary, an associate of science (A.S.) degree is a two-year program that focuses on natural science, engineering, and mathematics. It offers a comprehensive curriculum that prepares students for further studies or entry-level positions in STEM-related fields.

This degree provides a solid foundation in scientific principles and analytical skills, enabling graduates to pursue diverse career opportunities or continue their education at higher levels.

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The required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

To determine the required volume flow rate of liquid ethyl alcohol, we need to calculate the fuel flow rate first. Then, we can convert it to volume flow rate.

Given:

Rate of energy release (Q) = 2000 kJ/s

Excess air = 40% (or 0.4)

First, let's calculate the fuel flow rate (m f):

Q = m f × Lower Heating Value (LHV)

The Lower Heating Value (LHV) for ethyl alcohol can be calculated using the enthalpy of vaporization:

LHV = enthalpy of vaporization / molecular weight of fuel

LHV = 42,340 kJ/k mol / 46.07 kg/k mol = 920.11 kJ/kg

Now, we can calculate the fuel flow rate:

m f = Q / LHV

m f = 2000 kJ/s / 920.11 kJ/kg ≈ 2.173 kg/s

Next, let's convert the fuel flow rate to volume flow rate:

Volume flow rate (V f) = m f / density

V f = 2.173 kg/s / 790 kg/m³ = 0.002749 m³/s

Finally, we can convert the volume flow rate to L/min:

V f = 0.002749 m³/s × (1000 L/1 m³) × (60 s/1 min) ≈ 164.9 L/min

Therefore, the required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

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Answer:

36 atoms

Explanation:

The equation for the reaction is given below:

C6H12O6 + 6O2 —> 6CO2 + 6H2O

From the reaction above, the reactants include:

C6H12O6 and 6O2.

Thus, the total atom present in the reactants can be obtained as follow:

Element >>>>>>>> Atom present

Carbon (C) >>>>>> 6

Hydrogen (H) >>>> 12

Oxygen (O) >>>>>> 18

TOTAL >>>>>>>>>> 36

From the above illustration, 36 atoms are represented in the reactants.

Answer:

Because it serves their agenda.

Answer:

70.1 liters

Explanation:

At Standard Temperature and Pressure (STP), the conditions are defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm. To calculate the volume that 3.20 moles of oxygen gas would occupy at STP, we can use the Ideal Gas Law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Substituting the known values:

P = 1 atm

n = 3.20 moles

R = 0.0821 L·atm/mol·K

T = 273.15 K

Solving for V:

V = (nRT) / P = (3.20 moles * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm = 70.1 liters

In conclusion, 3.20 moles of oxygen gas would occupy 70.1 liters at STP.

I would agree with Student 2 in this debate.

While it is true that graphite (C) does not contain oxygen and therefore does not fit the traditional definition of a carbonate, the presence of carbon in its chemical formula does not automatically categorize it as a carbonate. The classification of minerals is determined by their chemical composition and crystal structure, among other factors.

Graphite is actually a form of pure carbon arranged in a specific crystal lattice structure, distinct from carbonates which typically contain carbon, oxygen, and other elements like calcium or magnesium. Hence, the presence of carbon alone does not make a mineral a carbonate, and Student 2's argument is more accurate in this context.

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Answer:  2 protons

Explanation:

The element number, 2 for He, is the number of protons in the nucleus.  The 4.0026 is the average atomic mass of He.

The rays that are mutagens are ultraviolet (UV) light and X-rays. Mutagens are substances or types of radiation, such as ultraviolet (UV) light or X-rays.

That result in permanent and inherited alterations (mutations). Deoxyribonucleic acid is found in the genetic material of cells (DNA). What makes UV light mutagens. DNA alterations aren't always caused directly by UV exposure. Longer than X-rays but shorter than visible light, ultraviolet (UV) radiation has a wavelength ranging from 10 nanometers (with a corresponding frequency of about 30 PHz) to 400 nanometers (750 THz). mutagens classified as physical, chemical, and biological agents. The first mutagenic agent discovered in 1920 was radiation. Other ionizing and non-ionizing radiations, including neutrons, alpha rays, X-rays, and UV rays, are also mutagenic.

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Benzene (C6H6) burns in air to produce carbon dioxide and liquid water.The heat released in KJ per gram of the compound reacted with oxygen is -41.83 KJ.

Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred.

The movement of minuscule atoms, molecules, or ions in solids, liquids, and gases produces heat energy. From one thing to another, heat energy can be exchanged. Heat is the flow or transfer that occurs as a result of the temperature differential between two objects.

Reaction as follows;

2C6H6 + 15O2 → 12CO2 + 6H2O

2x49.04   2x10       12x-393.5  6x-285.8

= [ 12(-393.5 )+6(-285.8) ] - [ 2(49.04)+(2x10) ]

= - 6936.8 - 98

= - 6534.8 KJ/mole

Per gram of benzene

= ( -6534.8 KJ / 2 mole of C6H6) (1 mole of C6H6 / 78.108g )

= -41.83 KJ / mole

Thus, The heat released in KJ per gram of the compound reacted with oxygen is -41.83 KJ.

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It will take approximately 18197 years for the sample of C-14 to decay from an activity of 1050 to an activity of 205.

The question is asking for the number of years that will pass before a sample of C-14 decays from an activity of 1050 to an activity of 205. Given that the half-life of C-14 is 5700 years, we can use the formula for exponential decay to solve for the time required. The formula is:
N = N₀ (1/2)^(t/t₁/₂)
where:
N = final amount
N₀ = initial amount
t = time elapsed
t₁/₂ = half-life
We can rearrange the formula to solve for t:
t = t₁/₂ (ln(N₀/N)) / ln(1/2)
Using the given values, we have:
N₀ = 1050
N = 205
t₁/₂ = 5700
Substituting into the formula:
t = 5700 (ln(1050/205)) / ln(1/2)
t ≈ 18197 years (rounded to the nearest year)

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It will take approximately 18197 years for the sample of C-14 to decay from an activity of 1050 to an activity of 205.

The question is asking for the number of years that will pass before a sample of C-14 decays from an activity of 1050 to an activity of 205. Given that the half-life of C-14 is 5700 years, we can use the formula for exponential decay to solve for the time required. The formula is:

N = N₀ (1/2)^(t/t₁/₂)

where:

N = final amount

N₀ = initial amount

t = time elapsed

t₁/₂ = half-life

We can rearrange the formula to solve for t:

t = t₁/₂ (ln(N₀/N)) / ln(1/2)

Using the given values, we have:

N₀ = 1050

N = 205

t₁/₂ = 5700

Substituting into the formula:

t = 5700 (ln(1050/205)) / ln(1/2)

t ≈ 18197 years (rounded to the nearest year)

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Answer:

he distance to a star can be found by comparing its luminosity to its apparent brightness.

Explanation: A star that is far away will be very dim compared to its luminosity. So it proves that  the ratio of its luminosity to apparent brightness will be greater than for a nearby star.

The hydronium ion concentration is approximately 2.65 x 10^-5 M, and the pH of the 0.20 M solution of hypochlorous acid is approximately 4.58.

To find the hydronium ion concentration and pH of a 0.20 M solution of hypochlorous acid (HClO), we will use the given Ka value (3.5 x 10^-8) and follow these steps:

1. Write the dissociation equation of hypochlorous acid:
HClO ⇌ H⁺ + ClO⁻

2. Set up the initial concentrations (in moles per liter):
[HClO] = 0.20 M
[H⁺] = 0 (initially)
[ClO⁻] = 0 (initially)

3. Define the changes in concentration:
HClO will lose x moles, and H⁺ and ClO⁻ will gain x moles each.

4. Set up the equilibrium concentrations:
[HClO] = 0.20 - x
[H⁺] = x
[ClO⁻] = x

5. Use the Ka expression:
Ka = [H⁺][ClO⁻] / [HClO]
3.5 x 10^-8 = (x)(x) / (0.20 - x)

6. Since Ka is very small, we can assume that x is much smaller than 0.20, so (0.20 - x) ≈ 0.20. This simplifies the equation:
3.5 x 10^-8 = (x)(x) / 0.20

7. Solve for x (the hydronium ion concentration):
x² = 3.5 x 10^-8 * 0.20
x² = 7.0 x 10^-9
x = √(7.0 x 10^-9)
x ≈ 2.65 x 10^-5 M

8. Calculate the pH:
pH = -log[H⁺]
pH = -log(2.65 x 10^-5)
pH ≈ 4.58

The hydronium ion concentration is approximately 2.65 x 10^-5 M, and the pH of the 0.20 M solution of hypochlorous acid is approximately 4.58.

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Answer:

flourine 19F-

Explanation:

because we have 1 extra electron so the charge should be negative, then check the number of protons to know the atomic number, and 9 is flourine

Answer:

How can I tell if a chemical reaction is occurring? A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Explanation:

Answer:

Compound: A substance that is made up of more than one type of atom bonded together.

Mixture: A combination of two or more elements or compounds which have not reacted to bond together; each part in the mixture retains its own properties.

Explanation:

The different substances in a mixture are not chemically combined, whereas the different elements in a compound are. The atoms do not combine in the mixture, but they combine when they form a compound.

Answer:

Explanation:

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

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{15}{14} \\ =1.0714285 ...\)

We have the final answer as

Hope this helps you