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Every winter, Alice notices that the monarch butterflies seem to disappear from her backyard garden. Then, the butterflies return to her garden each spring.

Which best describes the butterflies’ behavior?

migration, which is a response to an external stimulus
migration, which is a response to an internal stimulus
flight, which is a response to an external stimulus
flight, which is a response to an internal stimulus

Answer:

Wetlands prevent flooding by temporarily storing and slowly releasing stormwater. Wetlands also reduce water flow, thus allowing sediments and associated pollutants to settle out. Beneficial microor- ganisms (called biofilm) live on wetland plants and process some forms of pollution.

Explanation:

The molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.

The molecular mass of a substance can be calculated by dividing the mass of the substance by the number of moles.

molecular mass = mass ÷ no of moles

However, the number of moles of the substance must first be calculated by dividing the number of atoms by Avogadro's number.

no of moles = 30.066 × 10²³ ÷ 6.02 × 10²³

no of moles = 4.99moles

molecular mass = 10g ÷ 4.99 moles = 2.00 g/mol

Therefore, the molecular mass of a 10g compound that has 30.066 × 10²³ atoms is 2.00g/mol.

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Answer:

Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.

Explanation:

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Answer:

1) The frequency of each photon is 3.0 × 10⁹ Hz

2) The energy of each photon is 1.98786 × 10⁻²⁴ J

Explanation:

The energy, 'E', in a photon of light is given by Planck's equation as follows;

E = h·f = h·c/λ

Where;

E = The energy of a photon

h = Planck constant = 6.6262 × 10⁻³⁴ J·s

f = The frequency of the photon/radiation

c = The speed of light = 3.0 × 10⁸ m/s

λ = The wavelength of the photon/radiation

The given parameters of the microwave are;

The wavelength, λ = 10 cm = 0.1 m

The type of wave = Microwave

1) From E = h·f = h·c/λ, we find that the frequency, 'f' equals c/λ

∴ f = 3.0 × 10⁸ m/s/(0.1 m) = 3.0 × 10⁹ 1/s = 3.0 × 10⁹ Hz

The frequency of each photon, f = 3.0 × 10⁹ Hz

2) From E = h·f = h·c/λ, the energy, 'E', of each photon is given as follows;

E = h·c/λ = 6.6262 × 10⁻³⁴ J·s × 3.0 × 10⁸ m/s/(0.1 m) = 1.98786 × 10⁻²⁴ J

The energy of each photon, E = 1.98786 × 10⁻²⁴ J

Moles of solute for both a and b are the same = 1 mol

Given

a 500 cm³ of solution, of concentration 2 mol/dm³

b 2 litres of solution, of concentration 0.5 mol/dm³

Required

moles of solute

Solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

Can be formulated :

\(\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}\)

a.

V = 500 cm³ = 0.5 L

M = 2 mol/L

n=moles = M x V

n = 2 mol/L x 0.5 L

n = 1 mol

b.  

V = 2 L

M = 0.5 mol/L

n=moles = M x V

n = 0.5 mol/L x 2 L

n = 1 mol

Answer: C. Determine the total number of valence electrons in each atom

Explanation: That’s the main thing that a Lewis structure/ e-dot diagram shows!

Answer:

it is the first one :)

Explanation:

im almost 70 percent sure its the first one, because you can describe motion with all of these. good luck !

Answer: bromine

Explanation:

There are a total of 2+2+6+2+6+2+10+5=35 electrons, meaning there are 35 protons. The element with atomic number 35 is bromine

Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number.

The number of protons in an atom determines its atomic number, and isotopes have the same atomic number but different numbers of neutrons.

Beryllium exists in Group 2 (Column 2) with the atomic number 4.

The atomic number of the next element in the group would be right below it, Magnesium (Mg). Magnesium contains the atomic number 12.

The atomic number is the small number on the top left corner of the square of the element.

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Strong base  dissociates 90% into metal ions and hydroxide ions in solution.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

Equilibrium. Option C is correct

This law states that a new equilibrium state is achieved if the changes in temperature, pressure, concentration and volume will cause a predictable and opposing changes in the system.

This shows that Le Chatelier's principle can be used to predict the properties above to determine the effect equilibrium have on a system.

Based on the above explanations, we can conclude that Le Chatelier's Principle governs the property of Equilibrium.

The study of substances that lack the element carbon, but may contain the element hydrogen is called inorganic chemistry.

Inorganic chemistry deals with the chemical properties and behavior of inorganic compounds, which are substances that do not contain carbon-hydrogen bonds, but may contain other elements such as metals, nonmetals, and metalloids. Examples of inorganic compounds include salts, metals, acids, bases, and minerals.

Inorganic chemistry plays an important role in a wide range of fields, including materials science, environmental science, pharmaceuticals, and agriculture. It is used to develop new materials, such as semiconductors and catalysts, to understand the behavior of pollutants in the environment, to develop new drugs, and to improve crop yields. Inorganic chemists also study the structures and properties of minerals, which are important for geology, mining, and the extraction of metals.

Overall, the study of inorganic chemistry is essential for understanding the fundamental nature of matter and its interactions with the environment.

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(a) Draw resonating structure of PhenolPhenol is a common organic molecule. It consists of a phenyl group (C6H5) attached to a hydroxyl group (OH). The hydroxyl group is connected to the benzene ring at the para position, denoted as p-phenol.

The two main resonating structures of Phenol are shown in the figure below: This reaction takes place by cleaving the double bond of Cyclohexene using ozone, followed by a reductive workup step.

(b) Phenol is heated with CH3COCl:When Phenol is heated with Acetyl Chloride, it forms Acetophenone. The reaction is as follows:Phenol reacts with Acetyl Chloride to form Acetophenone, with the elimination of HCl as a by-product.(c) Propyne reacts with hydrogeniodide in the presence of benzene peroxide:Propyne reacts with hydrogen iodide in the presence of benzene peroxide to form 2-Iodopropane.

The reaction proceeds via a radical mechanism, as shown below:The chain initiation step:This step involves the homolytic cleavage of the benzene peroxide bond to generate benzene and two free radicals. These free radicals then interact with hydrogen iodide to form iodine radicals.The chain propagation step:The chain propagation steps involve the following sequence of reactions:The chain termination step:

This reaction involves the formation of 2-Iodopropane.(d) Propoxypropane is reacted with access of NH3:Propoxypropane is reacted with excess of NH3 to form Propylamine. The reaction is as follows:Propoxypropane undergoes nucleophilic substitution with ammonia, followed by deprotonation, to form the corresponding amine. Excess ammonia is required to drive the reaction to completion.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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he mass defect of the helium nucleus ⁴He₂ is 0.030377 u

Further explanation

Mass defect means the difference between the mass of particles forming an atom with an atomic mass.

Δm = mass defect ( u )

mp = mass of proton ( u )

me = mass of electron ( u )

mn = mass of neutron ( u )

M = atomic mass ( u )

A = mass number

Z = atomic number

Let us now tackle the problem !

Given :

Unknown :

Δm = ?

Solution :

Learn more

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Answer details

Grade: College

Subject: Physics

Chapter: Nuclear Physics

Keywords: Mass , Defect , Nucleon , Number , Atomic , Proton , Electron , Neutron

the volume of the gas at a constant temperature and 300 mmHg is approximately 4.67 liters.

The closest option from the given choices is C. 4.7L.

To solve this problem, we can use Boyle's law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.

Boyle's Law equation:

P1 * V1 = P2 * V2

where:

P1 = initial pressure (in torr)

V1 = initial volume (in liters)

P2 = final pressure (in mmHg)

V2 = final volume (to be determined)

Let's substitute the given values into the equation:

P1 = 700 torr

V1 = 2.0 liters

P2 = 300 mmHg (Note: we need to convert it to torr)

To convert mmHg to torr, we know that 1 torr is equal to 1 mmHg. Therefore:

P2 = 300 mmHg = 300 torr

Now we can solve for V2:

P1 * V1 = P2 * V2

(700 torr) * (2.0 L) = (300 torr) * V2

Simplifying the equation:

1400 L * torr = 300 torr * V2

Dividing both sides by 300 torr:

(1400 L * torr) / (300 torr) = V2

V2 ≈ 4.67 L

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Answer:

ternary

Explanation:

A ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

An ionic compound is a chemical complex made up of ions that are held together through electrostatic forces. The molecule is essentially neutral, however, it contains positively charged cations as well as negatively charged anions.

An ionic compound with three components is known as a ternary ionic compound. One type of cation including one type of anion are still present in a typical ternary ionic combination. Polyatomic ions are cations, anion, or both.

Therefore, a ternary ionic compound is a polyatomic ionic compound composed of three or more different elements.

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Answer:

the answer is B no need to struggle ur answer is correct

Answer:

the flask feels warm

Explanation:

in exothermic reaction heat is leaving the system and entering the surroundings aka the flask

also i took the quiz

Answer:

type of surface

Explanation:

The independent variable is the variable that doesn't depend on anything else. The dependent variable would be the time in seconds because that depends on the independent variable which is the type of surface.

hope this helps :)

Answer:

Avogadro's number is the number of particles in one mole of anything. In this context, it is the number of atoms in one mole of an element. It's easy to find the mass of a single atom using Avogadro's number. Simply divide the relative atomic mass of the element by Avogadro's number to get the answer in grams.

Answer:

D. It is the same as the element's atomic mass, but in grams.

Explanation:

other answer didn't give the actual option lol

An error can be defined as a deviation from the correct value of a given measurement.

The percent error is 8.7%

The formula for percent error is given as:

Percent error = |Measured  value – Exact Value|/Exact value * 100.

From the above:

Measured value = 25 ml

Exact Value = 23 ml

Hence:

Percent Error = | 25ml - 23 ml | / 23 ml * 100

Percent Error = 2/23 * 100

Percent Error =  8.7%

Therefore the percent error is 8.7%

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Copper is frequently used for electrical wiring because it is a cheaper alternative to silver, which is a better conductor and non-magnetic substance.

Alloys and pure elements are both included in this list of materials' electric conductivity. The list makes the assumption that all samples are the same size since a substance's size and shape have an impact on its conductivity. From the greatest to the least conductible:

Silver

Copper

Gold

Aluminum

Zinc

Nickel

Brass

Bronze

Iron

Platinum

Carbon Steel

Lead

Stainless Steel

Because metal is an excellent conductor of electricity, copper is utilised for electrical wiring. Metals may conduct electricity because the free electrons in the metal can pass through it. The only metal with a greater electrical conductivity than copper is silver, a valuable metal. However, compared to copper, it is a more costly material. This is why copper, not silver, is often used in electrical wiring.

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I hope it's helpful!!

The noble gas that precedes a given partial electron configuration must itself have an electron configuration that is complete up to the partial electron configuration. The noble gas's electron configuration should, when fully written out right before the partial electron configuration, give us a valid electron configuration for some element.

For the first series, the highest principal energy level has the number 4, so our noble gas should at least be one that is in the third period (numerically, the energy level is the same as the period number). That noble gas would be argon. The partial electron configuration given is not that of a noble gas (note: all noble gases have an electron configuration that contains Np⁶, where N = the highest principal energy level). So, the noble gas that appropriately precedes our first partial electron configuration is [Ar].

Argon's electron configuration is 1s²2s²2p⁶3s²3p⁶. Using the Aufbau Principle, 4s² would correctly follow 3p⁶. [Ar]4s²3d¹⁰4p² is equivalent to writing out 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p²; either way, this would happen to be the electron configuration of germanium.

Now that we hopefully have our fundamentals down, we can apply them to figure out the noble gases that precede the remaining partial electron configurations.

[Kr]5s²4d¹⁰5p⁵: This is the electron configuration of iodine.

[He]2s²2p⁵: This is the electron configuration of fluorine.

[Xe]6s²4f¹⁴5d¹⁰6p²: This is the electron configuration of lead.

[Ne]3s²2: This is the electron configuration of magnesium.

All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.

Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.

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74.44g of EDTA will be needed to make 500 ml of a 0.4 M EDTA solution if the molar mass of edta is 372.2 g/mol.

Ethylenediaminetetraacetic acid is referred to as EDTA. Because it is a chelating agent, it can attach to metal ions and draw them out of a solution.

EDTA is frequently employed in a variety of industrial and laboratory applications, including the manufacture of paper and textiles, the removal of heavy metals from water, and the elimination of divalent cations that may inhibit the activity of enzymes in biochemistry. EDTA is additionally utilised in several medical procedures as well as blood collecting tubes as an anticoagulant.

To calculate the amount of EDTA needed, :

mass (g) = molarity (mol/L) x volume (L) x molar mass (g/mol)

Substituting the given values, we get:

mass (g) = 0.4 mol/L x 0.500 L x 372.2 g/mol

mass (g) = 74.44 g

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