Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by: A. melting B. evaporation C. condensation D. conduction.

Answer:

A. Antibiotic resistance can sometimes be shared among bacteria.

B. Mutation can cause antibiotic resistance.

D. Antibiotics killing bacteria while allowing mutated bacteria to live is an example natural selection.

Explanation:

Identifying: Archaea have cell walls that lack peptidoglycan and have membranes that enclose lipids with hydrocarbons rather than fatty acids (not a bilayer). ... Bacteria: cell membrane contains ester bonds; cell wall made of peptidoglycan; have only one RNA polymerase; react to antibiotics in a different way than archea do.

Hope this helps, I reported some answer that was absurd, not applicable, incomplete and confusing

Mutation can cause antibiotic resistance, Bacteria that become resistant are an example of evolution. Antibiotics killing bacteria while allowing mutated bacteria to live is an example natural selection The correct options are B, D, and C.

Archaea, like bacteria, lack interior membranes but have a cell wall and swim with flagella.

Archaea differ from bacteria in that their cell wall lacks peptidoglycan and their cell membrane contains ether linked lipids rather than ester linked lipids.

The dispersion of antibiotic resistance in pathogenic bacteria is a simple and elegant example of natural selection at work.

Bacteria can develop antibiotic resistance through mutations that alter antibiotic cellular targets or by acquiring dedicated resistance genes from other bacteria.

Antibiotic resistance can be caused by mutation; bacteria that become resistant are an example of evolution. Natural selection is demonstrated by antibiotics killing bacteria while allowing mutated bacteria to live.

Thus, B, D, and C are correct options.

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Based on the given description, the student is most likely describing a liquid.

As we know, liquids do not have any definite shape, but they do have a definite volume. This is because the particles of matter in a liquid are close together, but they are still able to flow past each other. Due to this property, liquid take the shape of its container.

Some examples of liquids include water, oil, and gasoline.

Other states of matter include solids and gases.

Solids have a definite shape and volume, and the particles of matter in a solid are not able to flow past each other.

Gases have no definite shape or volume, and the particles of matter in a gas are very far apart and are able to move freely.

Thus, the correct answer is liquids.

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Answer:

The answer is A

Explanation:

Answer:

D)All of the above

If iodine has a 13.3 hour half life, 3.12 mg of the original sample will still be present after 39.9 hours.

The reaction rate must decrease to half its initial value before the process has reached its half life. The split of that first order chemical reaction is a quantity related to the rate constant of the reaction.

Briefing:

Given, the iodine half-life is 13.3 hours. As a result, half-life t1/2 Equals ln 2/ K

k = 0.693 .... t1/2

≈ 0.693 /13.3 hours

= 5.21 *10-2

The rate law sets the flow timetime is set by the rate law, which varies for each emotion. When only one reactant's quantity influences the speed of chemical reaction, this is referred to as a first-order contact. Because of this, it is occasionally referred to as unimolecular process. The rate is as follows for this type of reaction: k= 1/t ln [A]0 / [A] is the rate constant for the first order reaction. 5.21 * 10-2 hours are in 39.9 hours.

By including all the numbers in the initial order reaction's rate constant equation, we obtain [A].

t = 3.12mg

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2.3 kilograms of tio2 can be prepared from 5.45 kg of ticl4.

The given problem states to calculate the kilograms of TiO2 that can be prepared from 5.45 kg of TiCl4.

The balanced chemical equation of the reaction between TiCl4 and H2O is as follows:

TiCl4 + 2H2O = TiO2 + 4HCl

Molar mass of TiCl4 = 189.68 g/mol

Molar mass of TiO2 = 79.87 g/mol

As per the stoichiometry of the balanced chemical equation, 1 mol of TiCl4 gives 1 mol of TiO2.

Therefore, the molar ratio of TiCl4 to TiO2 is 1:1.

Using the molar masses of TiCl4 and TiO2 and the given mass of TiCl4, we can calculate the number of moles of TiCl4 as follows:

Number of moles of TiCl4 = (mass of TiCl4) / (molar mass of TiCl4)

= 5.45 kg / 189.68 g/mol

= 28.762 mol

Since the molar ratio of TiCl4 to TiO2 is 1:1, the number of moles of TiO2 formed will also be 28.762 mol.

Mass of TiO2 = (number of moles of TiO2) × (molar mass of TiO2)

= 28.762 mol × 79.87 g/mol

= 2300.16 g

= 2.3 kg

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The molar absorptivity of compound X is approximately 7.99 × 10^3 M^(-1) cm^(-1).

To calculate the molar absorptivity of compound X, we can use the Beer-Lambert Law, which states that the absorbance of a sample is directly proportional to its concentration and the molar absorptivity.

The Beer-Lambert Law equation is given by:

A = ɛ * c * l

Where:

A is the absorbance,

ɛ (epsilon) is the molar absorptivity,

c is the concentration of the compound in moles per liter (M), and

l is the path length in centimeters (cm).

Given:

Absorbance of compound X solution (A) = 0.331

Path length (l) = 1.000 cm

Concentration of compound X (c) = 4.14 × 10^(-5) M

We can rearrange the equation to solve for the molar absorptivity (ɛ):

ɛ = A / (c * l)

Substituting the given values:

ɛ = 0.331 / (4.14 × 10^(-5) M * 1.000 cm)

Calculating the result:

ɛ ≈ 7.99 × 10^3 M^(-1) cm^(-1)

Therefore, the molar absorptivity of compound X is approximately 7.99 × 10^3 M^(-1) cm^(-1).

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The given statement, Arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable hydroxide ions is true.

This is known as the Arrhenius theory of acids and bases, which was proposed by the Swedish chemist Svante Arrhenius in 1887.The theory defines an acid as a substance that releases hydrogen ions (H+) when dissolved in water, and a base as a substance that releases hydroxide ions (OH-) when dissolved in water.

Acids are therefore proton donors, while bases are proton acceptors. Arrhenius theory has since been expanded to include other types of acids and bases, such as Lewis acids and bases, which involve the transfer of electrons rather than protons.

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Answer:

A group of cells working together is defined as a tissue and several tissues working together comprise an organ.

Explanation:

To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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Answer:

Sand comes from many locations, sources, and environments. Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar .

Explanation:

Answer:

Origin

Explanation:

Explanation:

Given the amount of fluorine is ---- 1.25 mol.

What is the mass of given fluorine in grams?

Since

\(Number of moles =\frac{given mass of the substance}{its molecular mass}\)

To get the mass of the substance in grams, multiply the given number of moles with the molecular mass of the substance.

Hence, among the given options, the correct answer is the last option that is

Multiply the atomic mass of fluorine by 1.25.

Answer:

Multiply the atomic mass of fluorine by 1.25.

Explanation:

i got it right on the exam!! :)

To change  the dull  dark red form of hemoglobin to the shinning ruddy shape, Hb must tie with oxygen (O2) through a handle called oxygenation.

Hemoglobin bound to oxygen assimilates blue-green light, which suggests that it reflects red-orange light into our eyes, showing up ruddy. That's why blood turns shinning cherry ruddy when oxygen ties to its iron. Without oxygen associated, blood could be a darker red color.

This work requires the nearness of oxygen within the environment and the accessibility of oxygen-binding destinations on the hemoglobin atom depending on the concentration of oxygen and the degree of oxygenation of hemoglobin.

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The mass of  Zn3(PO4)2 that will be produced by 2.12 grams of (NH4)3PO4 will be 3.845 grams.

We can start by writing a balanced equation for the reaction between (NH4)3PO4 and Zn(NO3)2:

3(NH4)3PO4 + 2Zn(NO3)2 → Zn3(PO4)2 + 6NH4NO3

We can see from the balanced equation that 3 moles of (NH4)3PO4 react with 2 moles of Zn(NO3)2 to produce 1 mole of Zn3(PO4)2.

We can use this information to calculate the number of moles of Zn3(PO4)2 produced by 2.12 grams of (NH4)3PO4:

1 mole Zn3(PO4)2 = 3 moles (NH4)3PO4

mole Zn3(PO4)2 = 2.12 g (NH4)3PO4 / 149.086 g/mol (NH4)3PO4 × 1 mole Zn3(PO4)2 / 3 moles (NH4)3PO4

mole Zn3(PO4)2 = 0.00996

Next, we can calculate the mass of Zn3(PO4)2 produced:

mass Zn3(PO4)2 = mole Zn3(PO4)2 × 386.11 g/mol Zn3(PO4)2

mass Zn3(PO4)2 = 0.00996 × 386.11 = 3.845 grams

Therefore, 2.12 grams of (NH4)3PO4 will produce 3.845 grams of Zn3(PO4)2.

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The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The number of moles of diphosphorus trusulfide can be produced if 10 moles of phosphorus and 13.0 moles of sulfur react to make P₂S₃ is 40 moles.

To calculate the number of moles of diphosphorus trusulfide can be produced, we must know the balanced chemical equation for the reaction of 10 moles of phosphorus and 13.0 moles of sulfur to form P₂S₃ is:

P4₄+ 3S₈ → 4P₂S₃

One mole of P₄ reacts with 3 moles of S₈ to form 4 moles of P₂S₃.

The molar ratio of P₄:S₈:P₂S₃ is 1:3:4. Using this ratio, we can calculate the number of moles of P₂S₃ produced by reacting 10 moles of phosphorus and 13.0 moles of sulfur.

P₄:S₈:P₂S₃

= 10:13:??

= (10÷1):(13÷3):(4÷1)

= 10:4.33:4

Since the ratio of P₄:S₈:P₂S₃ is 10:13:4, and 10 moles of phosphorus react, the limiting reactant is phosphorus. Therefore, the maximum amount of P₂S₃ that can be produced is given by the moles of P₄ that reacted. 4 moles of P₂S₃ are produced from 1 mole of P410 moles of P₄ are reacted.

Therefore, the maximum amount of P₂S₃ that can be produced is:

4 moles P₂S₃/ 1 mole P₄ × 10 moles P₄

= 40 moles P₂S₃

Hence, 40 moles of diphosphorus trisulfide can be produced.

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Answer:

There are 2 atoms of hydrogen in 1 molecule of water (H2O).

To find the number of atoms of hydrogen in 1 mole of water, we need to multiply the number of hydrogen atoms per molecule by Avogadro's number, which is approximately 6.02 x 10^23.

So, 1 mole of water contains:

2 atoms of hydrogen per molecule x Avogadro's number

= 2 x 6.02 x 10^23

= 1.204 x 10^24 atoms of hydrogen.

The peroxide to be 1 M, grams of H₂O₂ is in the 1 mL of hydrogen peroxide solution is 0.034 g.

Given that :

molarity of hydrogen peroxide , H₂O₂ =  1 M

volume of hydrogen peroxide . H₂O₂ = 1 mL = 0.001 L

The molarity expression is given as:

Molarity = number of moles / volumes in L

number of moles of H₂O₂ = molarity × volume

                                           = 1 × 0.001

                                            = 0.001 mol

now, the number of moles is given as :

number of moles = mass / molar mass

mass of H₂O₂ = number of moles × molar mass

                       =  0.001  × 34

                       = 0.034 g

Thus, The peroxide to be 1 M, grams of H₂O₂ is in the 1 mL of hydrogen peroxide solution is 0.034 g.

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Answer:

(a)57.48 percent (b) 29.45 percent

Explanation:

copper(II) bromide is 29.45 percent copper and 71.54 percent bromine. so the first element percentage composition is always the percentage composition of the compound.

that goes same with sodium hydroxide. it  is 57.48 percent sodium, 40 percent oxygen, and 2.52 percent hydrogen.

Answer:

Initial velocity (u) = 0 m/s

Final velocity (v) = 60 m/s

Time (t) = 7 sec

Acceleration (a) = ?

a = (v-u)/t

a = (60-0)/7

a = 60/7

a = 8.57 m/s²

Answer:

Hrishikesh. bshjsjbd. jwjjja

Answer:

DNA aka deoxyribonucleic acid is a molecule in cells that holds genetic information. Their main job is to tell the cell what type of protein to make. The other instructions they hold for the organism is instructions on how to develop, survive and reproduce.

Explanation:

DNA is the genetic material made of two polynucleotide chains that coil around one another to create a double helix is called deoxyribonucleic acid (DNA).

All known organisms and many viruses have genetic information in the polymer that is necessary for their development, operation, growth, and reproduction. Nucleic acids include ribonucleic acid and DNA.

DNA is the genetic material found inside bodily cells that contribute to an individual's unique genetic makeup. Similar to the game's code or a home's blueprints, it contains the directions for creating the body.

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Answer:

the frequency  is 6.77

Explanation:

The amount of sucrose required will be 12.5 grams and the mass of water required will be 250 g.

5% by mass glucose solution is to be prepared. This means that 5g of glucose will be dissolved in 100 mL of water.

250g of such a solution will require 250 mL of water.

5% of 250g = 5/100 x 250 = 12.5 grams

Thus, the solution is prepared by dissolving 12.5 grams of sucrose in 250 grams (250 mL) of water.

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The parts of a nucleotide are a nitrogenous base, a sugar molecule (which is usually ribose or deoxyribose), and a phosphate group.

Deoxyribose is a type of sugar molecule, specifically a pentose monosaccharide, and is a key component to DNA. Deoxyribose is composed of five carbon atoms, with an oxygen and a hydrogen atom attached to each carbon atom, and an additional oxygen atom attached to the final carbon atom. The molecular formula of deoxyribose is C5H10O4. Deoxyribose is used to form the backbone of the double helix structure of DNA, and the bonds formed between the sugar molecules and nitrogenous bases are known as phosphodiester bonds. The phosphodiester bonds form the rungs of the DNA ladder.

DNA segments and chromosomes are not parts of a nucleotide, however, these structures are made up of multiple nucleotides.

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Answer:

B

Explanation:

i think with exothermic reactions heat is released

this is what i looked up

hope this helps i took chem last year and think this is what i learned

Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.

Energy is the ability to do work or to produce heat.

Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.

Chemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.

So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.

An endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.

In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.

When ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.

So, the correct answer is second option: the reaction is endothermic.

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(- Temperance Movement

there was a combination of political and social factors that led to prohibition. one of the main political factors was the Temperance Movement.

The temperance movement was a social movement against the consumption of alcohol.