During periods of glacial advance, ______ in seawater. CHOOSE ALL THAT APPLY.

concentrations of 18O and 16O remain steady

concentrations of 18O increase

concentrations of 16O decrease

concentrations of 16O increase

concentrations of 18O decrease


This is actually an earth science question, that was not an option

The mass of MgCO₃ is 1.9 g, the calculations are shown in the below section.

The balanced chemical reaction is shown below

Na₂CO₃   +   Mg(NO₃)₂     ⇒   2 NaNO₃   + MgCO₃

0.200 M   0.0450 M                                        ?

10.0           5.00 mL                                          ?

Since the volume and concentration of Mg(NO₃)₂ and Na₂CO₃  is given , we can calculate the number of moles for each of them and then determine the limiting reagent.

Convert the volume of  Mg(NO₃)₂and Na₂CO₃ to liters:

5.00 mL x ( 1 L/1000 mL ) =   5.00 x 10⁻³ L

10.00 mL x ( 1L/ 1000 mL ) = 1.000 x 10 ⁻² L

Number of  mol Mg(NO₃)₂ = ( 0.0450 mol /L  ) x 5.00 x 10⁻³ L

                                          = 2.25 x 10⁻⁴ mol Mg(NO₃)₂

Number of mol Na₂CO₃ = ( 0.200 mol / L ) x 1 x 10⁻² L  

                                       = 2.000 x 10⁻³  mol Na₂CO₃

Limiting reagent

= 2.25 x 10⁻⁴ mol Mg(NO₃)₂ x ( 1 mol Na₂CO₃ / mol  Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  Na₂CO₃ required .

Limiting reagent is Mg(NO₃)₂ since 2.25 x 10⁻⁴ mol  Na₂CO₃ is required to react completely with  2.25 x 10⁻⁴Mg(NO₃)₂, and there's an excess.

Number of  mole  of MgCO₃ produced

= 2.25 x 10⁻⁴ mol  Mg(NO₃)₂ x ( 1 mol MgCO₃ / 1 mol Mg(NO₃)₂ )

= 2.25 x 10⁻⁴ mol  MgCO₃

No. of Mole = mass/molar mass

Mass = No. of Mole × molar mass

2.25 x 10⁻⁴ mol  MgCO₃ x   84.31 g/mol  = 1.90 g

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The number of dots would be found in the Lewis dot structure for the compound  \(C_{2} H_{3}Cl_{3}\)  is 32.

To determine the number of dots in the Lewis dot structure for the compound \(C_{2} H_{3} Cl_{3}\) , we first need to know the structure. In the Lewis dot structure, each hydrogen atom has two dots representing two valence electrons and each chlorine atom has six dots representing six valence electrons. The carbon atoms each have four dots representing four valence electrons on their own atoms, and one additional dot on the double bond between them. Therefore, the total number of dots in the Lewis dot structure for the compound \(C_{2} H_{3} Cl_{3}\)  is:
(2 x 4) + (3 x 2) + (3 x 6) = 8 + 6 + 18 = 32

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There would be 32 dots in the Lewis dot structure for the compound \(C_{2}H_{3}Cl_{3}\).

To determine the number of dots in the Lewis dot structure for the compound \(C_{2}H_{3}Cl_{3}\)., we need to calculate the total number of valence electrons for each element in the compound.

1. Identify the number of valence electrons for each element:
  - Carbon (C) has 4 valence electrons.
  - Hydrogen (H) has 1 valence electron.
  - Chlorine (Cl) has 7 valence electrons.

2. Calculate the total number of valence electrons in the compound:
  - There are 2 carbon atoms, so 2 * 4 = 8 valence electrons for carbon.
  - There are 3 hydrogen atoms, so 3 * 1 = 3 valence electrons for hydrogen.
  - There are 3 chlorine atoms, so 3 * 7 = 21 valence electrons for chlorine.

3. Add up the total number of valence electrons:
  - 8 (from carbon) + 3 (from hydrogen) + 21 (from chlorine) = 32 valence electrons.

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The following are true statements regarding reversible reactions is a. a reversible reaction might proceed in only one direction, with negligible contribution from the reverse reaction, depending on conditions and c. the forward and reverse reactions may occur simultaneously.

Reversible reactions are reactions that can proceed in either direction. In reversible reactions, the products of the forward reaction can react to produce the original reactants. A reversible reaction is a chemical reaction that can go in either direction. The forward and reverse reactions occur simultaneously.

The equilibrium constant describes the relative concentrations of the reactants and products at equilibrium. The equilibrium constant will provide information about how far the reversible reaction goes.

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Pathogenic bacteria are the most problematic in the food industry. The term "pathogenic" refers to any bacteria that are capable of causing illness when consumed by humans or animals.

Option A is correct

Pathogenic bacteria are often found in foods that are not cooked or handled correctly. This includes raw meat, unpasteurized dairy products, and foods that are stored at incorrect temperatures for an extended period of time. It is crucial for food industry professionals to follow strict safety protocols to minimize the risk of pathogenic bacteria contaminating their products, leading to foodborne illnesses.Foodborne illnesses can be caused by a variety of microorganisms, including bacteria, viruses, and parasites. Pathogenic bacteria are a significant concern in the food industry, as they can cause serious illness and even death in vulnerable populations such as young children, pregnant women, and the elderly. The most problematic bacteria in the food industry are those that are pathogenic and are capable of multiplying quickly in the food environment. Pathogenic bacteria can cause food poisoning, which is a severe illness that can result in dehydration, fever, vomiting, and diarrhea.

The symptoms can be severe and can lead to hospitalization or even death if left untreated. The most common pathogenic bacteria found in food are Salmonella, Listeria, and E.coli. These bacteria are often found in raw or undercooked meat, unpasteurized dairy products, and fruits and vegetables that are not washed correctly. It is essential for food industry professionals to follow strict safety protocols to prevent the growth and spread of these bacteria. Proper handwashing, storage, and cooking techniques can help minimize the risk of foodborne illnesses caused by pathogenic bacteria. In conclusion, pathogenic bacteria are the most problematic in the food industry. Food safety protocols should be followed to minimize the risk of foodborne illnesses caused by these bacteria.

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Answer:

1.03 × 10¹

Explanation:

The decimal point is after the first non-zero digit number. The decimal or the number is multiplied by a 10 with an exponent.

Stoichiometry is omitted reactant. Reactants are the substances that participate in a chemical reaction. The process by which atoms, the fundamental building blocks of matter.

Rearrange themselves to form new combinations is described by a chemical reaction. Reactants - Reactants are the substances that participate in a chemical reaction. Products - Substances formed as a result of the formation of new bonds in a chemical reaction are referred to as products. As an example: H2 and O2 are reactants in this case because they participate in the chemical reaction. Reactants are the starting materials and appear on the left side of the equation. The products of the reaction are written on the right-hand side of the equation.

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Answer:

Based on the search results, there are three different questions provided:

1. A liquid with a mass of 0.6 kg, originally at a pressure of 1.4MPa and a temperature of 250 ∘C, is expanded reversibly and polytropically with an index of 1.25 to a pressure of 170kPa. If the liquid is air, calculate the final temperature, the work done and the heat flow.

2. Air of mass 1 kg expands reversibly and isothermally from 3.5MPa and 350 ∘C to 101.3kPa. Determine the heat flow. Assume that R=0.287 kJ/kg.K.

3. Air at a pressure of 900kPa, a temperature of 573 ∘C and a volume of 0.35 m3 is expanded to a pressure of 90kPa. (a) Determine the mass of air. (b) Calculate the final temperature, work and heat flow for each of the following processes: (i) isothermal expansion, (ii) adiabatic expansion, (iii) polytropic expansion.

Do you have a specific question related to any of these problems, or would you like to choose one for me to answer?

Explanation:

Answer:

2,282 cm³

Explanation:

If all other variables are being held constant, you can find the new volume of the balloon using the Charles' Law equation. The equation looks like this:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. Before you can solve for the new volume, you need to convert Celsius to Kelvin (negative values do not work in this equation). This can be done by adding 273.15 to each temperature.

V₁ = 2600 cm³                                    V₂ = ? cm³

T₁ = 21 °C + 273.15 = 294.15 K           T₂ = -15 °C + 273.15 = 258.15 K

V₁ / T₁ = V₂ / T₂                                               <----- Charles' Law

(2600 cm³) / (294.15 K) = V₂ / (258.15 K)      <----- Insert values

8.839 = V₂ / (258.15 K)                                   <----- Simplify left side

2282 = V₂                                                      <----- Multiply both sides by 258.15

Moving down the concentration gradient means the concentration of particles is higher in one area than another.

In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

Concentration is the amount of a substance in a given space. Another way to describe concentration is the proportion of the solute to a solvent or entire solution. In general, mass/unit volume is used to express concentration. Instead of using volume, concentration can be stated as a mass per unit. Although concentration is typically used to describe chemical solutions, it may be computed for any mixture. This can be seen in osmosis, where water moves from a higher concentration of solute to a lower concentration of solute.

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Answer:

When carbon dioxide dissolves in seawater, the water becomes more acidic and the ocean's pH (a measure of how acidic or basic the ocean is) drops.

Explanation:

hope this helps

CIF will tend to increase as the reaction proceeds toward equilibrium.

Given that Kp is equal to 20 at 2500 K, we can calculate the initial concentrations of CIF using the ideal gas law. Let's assume the initial volume is 1 liter for simplicity.

For Cl2:

P(Cl2) = 0.18 atm

n(Cl2) = P(Cl2) * V / (RT) = 0.18 mol

For F2:

P(F2) = 0.31 atm

n(F2) = P(F2) * V / (RT) = 0.31 mol

For CIF:

P(CIF) = 0.92 atm

n(CIF) = P(CIF) * V / (RT) = 0.92 mol

Based on the balanced equation, for every 1 mole of CIF, 1 mole of Cl2 and 1 mole of F2 are consumed. Therefore, the initial moles of CIF are equal to the initial moles of Cl2 and F2.

Since the initial concentrations of CIF, Cl2, and F2 are the same, and the reaction is not at equilibrium, we can conclude that CIF will tend to increase as the reaction proceeds toward equilibrium. This is because the reaction favors the formation of CIF, as indicated by the value of Kp. As CIF forms, the concentrations of Cl2 and F2 decrease, driving the reaction in the forward direction to restore equilibrium.

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Carbon 14 would be your answer, however if it's more than one answer it would also be Carbon 12, so yeah. Your best bet would be Carbon 14.

The amount of heat evolved by a reaction is, 53.84 kJ

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water

q = [q1 + q2]

q = [c1× ∆T]+[m2×c2×∆T]

where,

q = heat released by the reaction

q1 = heat absorbed by the calorimeter

q2 = heat absorbed by the water

c1 = specific heat of calorimeter = 600 j/g°c

c2 = specific heat of water = 4.184 j/g°c

m2 = mass of water = 500 g

∆T = change in temperature = 20°c

Now put all the given values in the above formula, we get:

q = (600×20) + (500×4.184×20)

q = 12000 + 41840

q = 53840 J

q = 53.84 kJ

Therefore, the amount of heat evolved by a reaction is, 53.84 kJ

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The balanced chemical equation using a linear system is:

3S2O32- + 2H2O + CrO42- -> 3SO42- + Cr(OH)42- + 2OH-

To balance the given chemical equation, we can set up a system of linear equations based on the number of atoms of each element on both sides of the equation.

In this case, we have 3 sulfur (S) atoms, 6 oxygen (O) atoms, 4 hydrogen (H) atoms, 1 chromium (Cr) atom, and 4 hydroxide (OH-) ions on the left-hand side. On the right-hand side, we have 3 sulfate (SO42-) ions, 1 chromium hydroxide (Cr(OH)42-) ion, and 2 hydroxide (OH-) ions.

By setting up and solving a system of equations, we can determine the coefficients that balance the equation. The coefficients obtained through the linear system are 3, 2, and 1 for S2O32-, H2O, and CrO42-, respectively, on the left-hand side, and 3, 1, 1 for SO42-, Cr(OH)42-, and OH- ions, respectively, on the right-hand side. This ensures that the number of atoms of each element and the charge is conserved in the balanced equation.

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Answer:

The element is Phosphorus

Explanation:

Answer:

im pretty sure its b

Explanation:

When any substance converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

The line along B represents the melting of unknown substance. Therefore the 72°C is melting point of the substance.

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Ionic compounds are created through the gain and loss of electrons. The attraction of the opposing charges causes the two atoms to stick together, forming a strong, long-lasting chemical bond.

Elements can either absorb or lose electrons to attain their closest arrangement as a noble gas. When ions come together to complete the octet, they become more stable. In a reaction with nonmetals, metals normally lose electrons to complete their octet while nonmetals typically receive electrons to do the same. Metal atoms lose electrons from their outer shell when they generate ions, which are positive because they have more protons than electrons. The resultant ions are fully enclosed in their shells. The ions' electrical structure resembles that of a noble gas (group zero element), a whole outer covering. Nonmetals have higher ionization energies and electron affinities than metals, which make it simpler for them to accept electrons and more challenging for them to lose them. Nonmetals are further to the right of metals on the periodic table. They almost make up a whole octet of eight electrons and have more valence electrons.

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Answer:

YEESSS

Explanation:

Because that seems like the only logical answer.

Answer:

YES

Explanation:

YES

The question is missing. Here is the complete question.

One light beam has wavelength, \(\lambda_{1}\), and frequency, f₁. Another light beam has wavelength, \(\lambda_{2}\), and frequency, f₂. Write a proportion that shows how the ratio of the wavelengths of these two light beams is related to the ratio of the frequencies.

Answer: \(\frac{f_{1}}{f_{2}} =\frac{\lambda_{2}}{\lambda_{1}}\)

Explanation: In vacuum, eletromagnetic waves travels at a constant speed called "speed of light", whose symbol is [c] and magnitude is 3x10⁸m/s.

Speed of light, frequency and wavelength are related by the formula:

\(c=\lambda.f\)

So, if one light beam has wavelength and frequency, \(\lambda_{1}\) and f₁, respectively, the second beam has wavelength \(\lambda_{2}\) and frequency f₂ and both travel at speed of light:

\(\lambda_{1}f_{1}=\lambda_{2}f_{2}\)

\(\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}\)

Then, the ratio that shows the relation between frequencies and wavelengths of these light beams is \(\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}\)

Answer:

3

Explanation:

beacuses im right

The oxidizing agent in the reaction Fe + \(AgNO_3\)→ \(Fe(NO_3)_3\) + Ag is option a \(AgNO_3.\)

A redox reaction is one in which the oxidation states of two species undergo changes. Iron is oxidized in the reaction, while silver nitrate is reduced. One of the reactants is being reduced, whereas the other is being oxidized.The oxidizing agent is the species that is being reduced, and it is the species that accepts electrons.

Fe is being oxidized in this reaction. Therefore, it cannot be the oxidizing agent, nor can\(Fe(NO_3)_3\). In contrast, \(AgNO_3.\)  is being reduced, which means it is accepting electrons. This is why\(AgNO_3.\)  is the oxidizing agent.The correct answer is  option a.

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Answer:

The electronic configuration of ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Explanation:

Lithium metal, Li will lose 1 electron to lithium ion Li+. Chlorine atom, Cl will receive the 1 electron to form the chloride ion Cl- as shown by the following equation below:

Li —> Li+ + e

Cl+ e —> Cl-

Combine both equation

Li + Cl + e —> Li+ + Cl- + e

Cancel out 'e'

Li + Cl —> Li+ Cl-

Thus, we can write the electronic configuration for the reaction as follow:

Before reaction:

Li (3) => 1s2 2s1

Cl (17) => 1s2 2s2 2p6 3s2 3p5

After reaction

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Therefore, the electronic configuration of the ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Orange waves have a lower frequency and contain less energy than green waves.

What is Wave?

A wave is a disturbance or oscillation that travels through space and time, accompanied by the transfer of energy without the transfer of matter. Waves can take many different forms, including sound waves, light waves, water waves, and seismic waves. They can be described in terms of their frequency, wavelength, amplitude, and velocity, among other properties. Waves play a fundamental role in many areas of science and technology, including communication, medicine, and engineering.

The energy of a wave is directly proportional to its frequency, which means that higher frequency waves contain more energy than lower frequency waves. The frequency of a wave refers to the number of complete cycles or oscillations that the wave undergoes per second, and is measured in units of Hertz (Hz).

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Carbon buildup can be removed from the metal portion of a pressing comb by immersing it in a solution containing an acid.

When a pressing comb is used for styling hair, it can accumulate carbon buildup over time. This buildup can affect the comb's performance and hinder smooth gliding through the hair.

To remove the carbon buildup, the metal portion of the comb can be immersed in a solution containing an acid. The acid helps to dissolve and break down the carbon deposits, making it easier to clean the comb.

Acids such as vinegar, lemon juice, or citric acid are commonly used for this purpose. These acids have properties that help in dissolving carbon and other residues. The comb should be soaked in the acid solution for a specific period of time, allowing the acid to work on the carbon buildup.

After soaking, the comb can be scrubbed gently with a brush or cloth to remove any remaining residue. Finally, rinsing the comb thoroughly with water and drying it properly completes the process.

Hence, immersing the metal portion of a pressing comb in a solution containing an acid is an effective method to remove carbon buildup and restore the comb's functionality.

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The answer you're looking for is: 237.15

Answer:

C.   Switch 4 and 5

Explanation:

edge2021

The atomic model gives a detailed understanding of the atoms and the sub-atomic particles. The models were given in order by Dalton, Thomson, Rutherford, Bohr, and Schrödinger. Thus, option C is correct.

The atomic model is the representation of the atom of the element along with the sub-atomic particles. The first model was given by Dalton, which stated that matter is composed of atoms.

Later Thomson discovered the presence of the electron present in the sea of the positive charges. In addition, Rutherford gave the presence of the positive nucleus in the middle of the atom.

Bohr's model gave the presence of the electron in the orbit of the atom around the nucleus. At last, the current atomic model was given by Schrödinger and is known as the electron cloud model.

Therefore, option C. Gina should Switch 4 (Schrödinger' model) with model 5 ( Bohr 's model).

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