which materials would provide the best protection from water acids corrosive chemicals and pathogens is called

Answer:

The percentage yield is 79.12%

Explanation:

The first thing we need to calculate here is the theoretical yield of ethyl ethanoate that can be obtained from 20g of ethanol.

Since the mole ratio is 1:1, then this is quite straightforward.

What we need to obtain at first here is the number of theoretical moles of ethanol reacting.

That would be mass of ethanol/molar mass of ethanol

Molar mass of ethanol is 46g/mol

Thus the number of moles is 20/46 = 0.4348 mole

Like it is indicated earlier, since the number of moles are equal from the balanced equation, it also means that 0.4348 mole of ethylethanoate is produced

Now, we need to know the mass of ethyl ethanoate produced

The mass can be calculated by multiplying the number of moles by the molar mass

The molar mass of ethyl ethanoate is 88g/mol

So the mass of it produced = 0.4348 * 88 = 38.2624 or let’s just say 38.26

Thus, the percentage yield will be;

Actual yield/Theoretical yield * 100%

From the question, our actual yield is 30.27g while our calculated theoretical yield is 38.26g

= 30.27/38.26 * 100% = 79.12%

The best alternative to using latex-free gloves when handling ready-to-eat food is using nitrile gloves.

Nitrile gloves are a suitable alternative to latex gloves for handling ready-to-eat food. Nitrile is a synthetic material that offers similar benefits to latex in terms of flexibility and dexterity. Nitrile gloves are also resistant to punctures and chemicals, providing a protective barrier against potential contamination. Moreover, nitrile gloves are considered hypoallergenic and do not cause the same allergic reactions as latex gloves, making them safe for individuals with latex allergies or sensitivities.

When handling ready-to-eat food, it is crucial to maintain hygiene and prevent cross-contamination. Wearing gloves is an important practice to minimize the risk of transmitting harmful microorganisms. By choosing nitrile gloves as an alternative to latex gloves, one ensures the safety of individuals who may be allergic to latex while maintaining the necessary level of protection when handling food. Nitrile gloves are widely available and commonly used in food handling settings, making them a suitable and reliable choice for ensuring food safety and hygiene.

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The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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The percent mass composition of carbon of the unknown compound is 42.8%.

The mass percentage of carbon in the given unknown compound is calculated as follows:

molar mass of carbon dioxide = 44.0 g/mol

molar mass of carbon = 12 g/mol

molar mass of water = 18 g/mol

molar mass of hydrogen = 1.0 g/mol

Moles of carbon dioxide = 2.31/44

Moles of carbon dioxide = 0.0525 moles

Moles of Carbon = 0.0525 moles

mass of carbon = 0.0525 * 12

mass of carbon = 0.105 g

Moles of water = 1.26/18

Moles of water = 0.07 moles

Moles of hydrogen = 0.07 * 2

Moles of hydrogen = 0.14 moles

mass of hydrogen = 0.14 * 1

mass of hydrogen = 0.14

mass of compound = 0.105 + 0.14

mass of compound = 0.245

Percentage mass of carbon = 0.105/0.245 * 100

Percentage mass of carbon = 42.8%

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Answer:

The answer is 4.

Explanation:

Finches.

Answer:

4. Finches

Darwin studied the forms of the beak, and found that they were different based on what they ate.

The mass of one mole of pennies is 1.326 × 1024 grams.

To determine the mass of one mole of pennies, we need to find the number of pennies in one mole and then multiply that by the mass of one penny. A mole of a substance is defined as the number of atoms, molecules or ions present in the substance and is equal to Avogadro's number, which is 6.022 × 1023.

Since one penny weighs about 2.2 grams, we can calculate the mass of one mole of pennies as follows:1 mole of pennies = 6.022 × 1023 pennies The mass of one mole of pennies = Number of pennies in one mole × Mass of one penny= 6.022 × 1023 × 2.2 grams= 1.326 × 1024 grams Therefore, the mass of one mole of pennies is 1.326 × 1024 grams.

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For this reaction: ΔG⁰>0.

Balanced chemical reaction A(g) ⇌ (g)

ΔG° indicates that all reactants and products are in their standard states.

ΔG° = R·T·lnK.

ΔG° is Gibbs free energy

T is the temperature on the Kelvin scale

R is the ideal gas constant

The equilibrium constant (K) is the ratio of the partial pressures or the concentrations of products to reactants.

Gibbs free energy (G) determines if reaction will proceed spontaneously, nonspontaneously or in equilibrium processes.

If K < 1, than ΔG° > 0.

Reactants (in this example A) are favored over products (in this example B) at equilibrium.

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Answer/Explanation:

Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change. Any characteristic that can be determined only by changing a substance's molecular structure.

When 3-methyl cyclohexene reacts with HBr in ether as the solvent, the reaction is classified as an electrophilic addition reaction. Here's the step-by-step explanation for the product formation, IUPAC name, and mechanism:

1. Product Formation: The 3-methyl cyclohexene reacts with HBr, leading to the addition of a bromine atom to the less substituted carbon of the double bond. The resulting product is 1-bromo-3-methylcyclohexane.

2. IUPAC Name: The IUPAC name for the product is 1-bromo-3-methylcyclohexane.

3. Mechanism Prediction:
Step 1: The HBr molecule acts as an electrophile, and the alkene double bond in 3-methyl cyclohexene acts as a nucleophile. The nucleophile attacks the electrophilic hydrogen atom in HBr, forming a bond with it.
Step 2: The bromide ion (Br-) is released as a leaving group from the HBr molecule. This leads to the formation of a carbocation intermediate, with the positive charge on the less substituted carbon (secondary carbocation) of the cyclohexane ring.
Step 3: The bromide ion attacks the carbocation, forming a bond with the positively charged carbon atom. This results in the formation of the final product, 1-bromo-3-methylcyclohexane.
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the true statements are that essential amino acids cannot be synthesized by the body and must be obtained through the diet.

Essential amino acids are those that cannot be synthesized by the body and must be obtained through the diet. They play crucial roles in protein synthesis and various biological processes. Based on this information, the correct options for describing essential amino acids are:

True:
- They cannot be synthesized by the body.
- They must be obtained through the diet.

False:
- They are only found in animal sources: Essential amino acids can be found in both animal and plant sources.
- They are not necessary for normal bodily functions: Essential amino acids are necessary for protein synthesis and various physiological processes.
- They are nonpolar: Essential amino acids can be both polar and nonpolar.

In summary, thethe true statements are that essential amino acids cannot be synthesized by the body and must be obtained through the diet.

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Magnesium has 3 stable isotopes: majority Mg-24 with 78'6%, Mg-25 with 10'1%, and Mg-26 with 11'3%.  24.31 u​ will be its atomic mass.

A chemical element's isotope is one of more than one species of atoms that share the same atomic number, spot on the periodic table, and almost identical chemical activity, but differ in atomic mass and physical characteristics. There are a number of isotopes for each chemical element. The first step in identifying and labelling an atom is to count the protons within its nucleus.

Average atomic mass = (M1P1 + M2P2 + M3P3 +….) / 100​

                     ​= (23.98504 x 78.70 + 24.98584 x 10.13 +25.95259 x 11.17)/100 ​                       = 24.31 u​

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The final concentration of H+ ions is approximately 3.27 x 10^-3 M.

To find the final concentration of H+ ions after mixing 1 L of 0.0550 M HCl with 1 L of 12 M acetic acid, we need to consider the dissociation of acetic acid and the reaction between HCl and acetic acid. First, let's calculate the concentration of acetic acid (CH3COOH) after mixing: The initial concentration of acetic acid = 12 M, The volume of acetic acid = 1 L, The final concentration of acetic acid = 12 M. Since acetic acid is a weak acid, it will partially dissociate according to its equilibrium expression:

CH3COOH ⇌ CH3COO- + H+. The dissociation of acetic acid can be represented by its equilibrium constant (Ka): Ka = [CH3COO-][H+] / [CH3COOH]. Given that the Ka for acetic acid is 1.80 x 10^-5, we can use this information to calculate the concentration of H+ ions: [H+] = √(Ka * [CH3COOH]), [H+] = √(1.80 x 10^-5 * 12 M) ≈ 3.27 x 10^-3 M. Therefore, the final concentration of H+ ions is approximately 3.27 x 10^-3 M.

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Answer:

The range of values of some property

Explanation:

A.pex, and the comments on the other answer

The best defines a spectrum is The range of values of some.

A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism. As scientific understanding of light advanced, it came to apply to the entire electromagnetic spectrum. It thereby became a mapping of a range of magnitudes (wavelengths) to a range of qualities, which are the perceived "colors of the rainbow" and other properties which correspond to wavelengths that lie outside of the visible light spectrum.

Spectrum has since been applied by analogy to topics outside optics. Thus, one might talk about the "spectrum of political opinion", or the "spectrum of activity" of a drug, or the "autism spectrum". In these uses, values within a spectrum may not be associated with precisely quantifiable numbers or definitions. Such uses imply a broad range of conditions or behaviors grouped together and studied under a single title for ease of discussion. Nonscientific uses of the term spectrum are sometimes misleading. For instance, a single left–right spectrum of political opinion does not capture the full range of people's political beliefs. Political scientists use a variety of biaxial and multiaxial systems to more accurately characterize political opinion.

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I can give you some general information about acid deposition and its effects Acid deposition refers to the deposition of acidic substances from the atmosphere onto the Earth's surface, including land, water bodies.

and buildings. This can happen through precipitation such as rain, snow, and fog, as well as dry deposition through the deposition of acidic gases and particles. The effects of acid deposition can include damage to forests, crops, and other vegetation, as well as damage to buildings and infrastructure. It can also lead to acidification of lakes and streams, which can harm aquatic life.

Acid deposition refers to the process where acidic particles or gases are deposited on Earth's surface through rain, snow, fog, or dry particles. This occurs when sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere, primarily from burning fossil fuels. They react with water, oxygen, and other chemicals to form acidic compounds that fall to the ground.

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A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus. Atoms are the basic building blocks of stuff.

In a neutral atom, there are exactly as many electrons as protons. The total number of protons and neutrons in the atom's nucleus is equal to the mass number (M) of the atom. The difference between the atomic number and the mass number of the atom (M) is equal to the amount of neutrons (Z).

Absorption is the process by which an atom transitions from its ground state to an excited state by absorbing energy from its environment. After absorbing the energy, the electron advances to a higher energy state. Up the opposite process, called emission, the electron releases the excess energy it had taken in and goes back to its ground state.

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Answer:

Explanation:

The correct reaction that represents the process of neutralization is:

HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

Neutralization is a chemical reaction between an acid and a base, which results in the formation of water and a salt. In this case, hydrochloric acid (HCl) is the acid, and potassium hydroxide (KOH) is the base. When they react, they form potassium chloride (KCl) and water (H₂O).

Answer:

18 Cups

Submitted the assignment

Explanation:

Answer:

3.6m/s

Explanation:

v= fλ

v= 120* 0.03

v= 3.6 m/s

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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Answer:

Between galaxies, retake the measurement.

Explanation:

Among both galaxies, reiterate the measurements. Instead of utilising a balloon, a scientist might create a model that shows in which everything really is and how cosmos is expanding rather than expanding. By inflating up the atmosphere to 1/2, 3/4, and full size, continue the operation.

Answer:

Water

Explanation:

Answer:

Water

Explanation:

Becasue the forest needs water to survie they may all compete for it.

Answer:

2:3:2

Explanation:

answer from VNese

Answer:

See Explanation

Explanation:

8.  3, 1, -1, +1/2 => 3pₓ¹ => Aluminum

9.  4, 2, +1, +1/2 => 4d₁¹ => Chromium

10. 6, 1, 0, -1/2 => 6p₀² => Argon

11.  4, 3, +3, -1/2 => 4f₊₃² => Lutetium

12. 2, 1, +1, -1/2  => 2p₊₁² => Neon

8. Aluminum- Atomic number-13

9. Yttrium-Atomic number-39

10. Thalium-Atomic number-81

11. Cerium-Atomic number-58

12. Boron-Atomic number-5

Firstly, lets see four quantum numbers:

The set of four quantum numbers are n, l, ml and ms which is principal, azimuthal, magnetic and spin quantum numbers respectively.

l= 0= s orbital

l= 1= p orbital

l= 2=d orbital

l= 3= f orbital

8. 3,1,-1,+1/2;

n=3, l=1, ml=-1 and ms=+1/2= \(3p^1\\\) orbital

so on writing electronic configuration:

The element is- Al- 1s² 2s² 2p⁶ 3s² 3p¹

9. 4,2,+1,+1/2;

n=4,l=2,ml=+1,ms=+1/2=\(4d^1 \\\) orbital

so on writing electronic configuration:

The element is-Y -[Kr]4d¹5s²

10.6,1,0,-1/2;

n=6,l=1,ml=0,ms=-1/2= \(6p^1\\\) orbital

so on writing electronic configuration:

The element is- Tl- [Xe]4f¹⁴5d¹⁰6s²6p¹

11. 4,3, +3, -1/2;

n=4,l=3,ml=+3,ms=-1/2=\(4f^1\\\) orbital

so on writing electronic configuration:

The element is-Ce- [Xe]4f¹5d¹

12. 2, 1, +1, -1/2;

n=2,l=1,ml=+1,ms=-1/2= \(2p^1\\\) orbital

so on writing electronic configuration:

The element is-B-1s² 2s², 2p¹

So the given elements are.

8. Aluminum- Atomic number-13

9. Yttrium-Atomic number-39

10. Thalium-Atomic number-81

11. Cerium-Atomic number-58

12. Boron-Atomic number-5

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Answer:

Answer is: elements in the same group have similar chemical properties. Periodic law is the arrangement of the elements in order of increasing atomic number.

Given,

A typical atom has a diameter of about 1.0 x 10^-10 m.

We need to find the diameter in inches and the number of atoms along a 1.0 cm line, assuming they just touch.

1 angstrom = 1 x 10^-10 m (given)

Diameter of typical atom = 1.0 x 10^-10 m

1 meter = 100 cm = 1000 mm = 1,000,000 μm = 1,000,000,000 nm = 1 x 10^10 Å1 inch = 2.54 cm

We can find the diameter in inches as below:

1 m = 100 cm = 1000 mm = 1000000 μm = 1000000000 nm = 1 x 10^10 Å1 m = 100/2.54 in (1 inch = 2.54 cm)1 Å = 1 x 10^-10 m1 Å = 1 x 10^-10 x 100/2.54 in = 3.937 x 10^-9 in1.0 x 10^-10 m = 1.0 x 10^-10 / (1 x 10^-10 x 100/2.54) in = 3.937 x 10^-9 in (approx)

Hence, the diameter of a typical atom in inches is approximately 3.937 x 10^-9 in.

Using the diameter of the atom, we can calculate the number of atoms along a 1.0-cm line as below:

1.0 cm = 1 x 10^-2 m

Diameter of the atom = 1.0 x 10^-10 m

Let the number of atoms along the line be n.

Then, we can write the equation:

n x (1.0 x 10^-10 m) = 1.0 x 10^-2 m

n = (1.0 x 10^-2 m) / (1.0 x 10^-10 m)

n = 1.0 x 10^8

Hence, there are approximately 1.0 x 10^8 atoms along a 1.0-cm line, assuming they just touch.

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Answer:

đoán xem

Explanation:

Answer:

Doam exnbhbjnmcgiojrrflcgggohotjg

Activation energy is the energy required to allow a reaction to proceed. In order to increase the rate of a reaction, the activation energy must be lowered. The activation energy is by adding a catalyst to the reaction. A catalyst is a substance that increases the rate of a reaction without being consumed in the process. The correct option is b.

Firstly, increasing the temperature of the reaction can lower the activation energy required for the reaction to proceed. This is because increasing the temperature causes the particles in the reaction to move faster and collide more frequently, which increases the likelihood of successful collisions. This increase in energy can overcome the activation energy barrier and allow the reaction to proceed more quickly. Another way to lower the activation energy is by adding a catalyst to the reaction.

A catalyst is a substance that increases the rate of a reaction without being consumed in the process. Catalysts work by providing an alternative pathway with a lower activation energy for the reaction to proceed. Increasing the surface area of the particles involved in the reaction can also lower the activation energy. This is because a larger surface area means there are more particles available to collide and react with each other, which increases the likelihood of successful collisions and reduces the activation energy required for the reaction to proceed.

Finally, adding more reactant molecules to the reaction can also lower the activation energy. This is because an increase in the number of particles in the reaction increases the likelihood of successful collisions, which reduces the activation energy required for the reaction to proceed. The correct option is b.

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The opposite of heterotroph is autotroph.

What is heterotroph?

An organism is referred to as a heterotroph if it consumes other plants or animals for food and energy. Its origins are in the Greek words hetero, which means "other," and trophe, which means "nutrition."

Examples - Human, birds, dogs, etc.

What is autotroph?

A primary producer, also known as an autotroph, is an organism that uses energy from light or inorganic chemical reactions to create complex organic chemicals from simple ones, such as carbon dioxide.

Example - plants, algae etc.

The opposite of heterotroph is autotroph.

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