Seals, sea birds, and polar bears use arctic sea ice like that shown below as a place to find food and shelter and to raise young.
Seals, sea birds, and polar bears use arctic sea ice like that shown below as a place to find food and shelter and to raise young.

Due to increased melting of the arctic sea ice, many of these organisms are unable to gather sufficient amounts of food or raise offspring to maturity. Based on this information, which of the following statements is a reasonable conclusion about the Arctic ecosystem?
Due to increased melting of the arctic sea ice, many of these organisms are unable to gather sufficient amounts of food or raise offspring to maturity. Based on this information, which of the following statements is a reasonable conclusion about the Arctic ecosystem?

Answer:

yes

Explanation:

CO2 is soluble because water molecules are attracted to these polar areas. The bond between carbon

Answer:

Oxidation half

Ca -----> Ca2+ +2elecyrons

Reduction half

Cl2 + 2electrons ------> 2Cl-

Explanation:

Answer:

Pacific Ocean

Explanation:

answer; 8.017*10^3

Explanation: because cube means it is multiplication of three times so we multiply 86.3 three times and again we multiply it with 100 because we need to convert it in mm and at last we put the answer in cube root ..

Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

Answer:

F = 0.0725 N

Explanation:

Given that,

The mass of peach, m = 7.4 g

We need to find the force acts on the peach when it falls from a tree. The force is given by :

F = mg

So,

\(F=7.4\times 10^{-3}\times 9.8\\\\F=0.0725\ N\)

So, the force is 0.0725 N.

The process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

What is crenation?

In botany and zoology, the term "crenation" refers to the round-toothed or scalloped shape of an object, particularly a leaf or shell. Modern Latin crenatus, meaning "scalloped or notched," is derived from common Latin crena, meaning "notch."

The term  can refer to a variety of items, including cells. One process of crenation is the contraction of a cell upon exposure to a hypertonic solution due to the loss of water through osmosis.Cucumber pickling and salt-curing of beef are practical applications of crenation.

Hence, the process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

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Answer:

1. A

2. B

Explanation:

The concentration of a solution formed by diluting 25.0 ml of a 3.2 m nacl solution to 135.0 ml is 0.60 mol

M1V1=M2V2

M2=M1V1/V2

M2= 3.2×25.0 ÷ 135.0

M2=0.60 mol.

The term "concentration" in chemistry refers to the elements that make up a mixture or solution. Here's how concentration is defined and how it can be calculated using various techniques. Concentration in chemistry refers to the quantity of a substance in a given area. The ratio of the solute in a solution to the solvent or total solution is another way to define concentration. In order to express concentration, mass per unit volume is typically used. The solute concentration can, however, also be expressed in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume. Although concentration is typically used to describe chemical solutions, it can be calculated for any mixture. Concentration Examples in Units: g/cm3, kg/l, M, m, N, and kg/L

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N₂O₄(g)   ---->  2NO₂(g) is called as the decomposition reaction.

When one reactant in a chemical reaction is decompose to form one or more products then the chemical reaction is said to be decomposition reaction. The reaction is as follows :

N₂O₄(g)   ---->  2NO₂(g)

This equation is balanced equation. Dinitrogen tetroxide containing N - N single bond dissociates to form two molecules of nitrogen dioxide. the reaction is called as decomposition reaction . decomposition reaction are generally endothermic reaction because they require heat to decompose. as we know to break the bond energy is absorbed and formation of bond is the release of energy.

Thus, N₂O₄(g)   ---->  2NO₂(g) is called as the decomposition reaction.

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To calculate the relative atomic mass of the element, we multiply the isotopic mass of each isotope by its relative abundance, and then sum up the results.

For isotope 1, the contribution to the relative atomic mass is (57.93 amu * 67.76% = 39.24 amu).

For isotope 2, it is (59.93 amu * 26.16% = 15.68 amu).

For isotope 3, it is (60.93 amu * 1.25% = 0.76 amu).

For isotope 4, it is (61.93 amu * 3.66% = 2.27 amu).

For isotope 5, it is (63.93 amu * 1.16% = 0.74 amu).

Summing up the contributions, we get (39.24 amu + 15.68 amu + 0.76 amu + 2.27 amu + 0.74 amu = 58.69 amu).

Therefore, the relative atomic mass of the element is approximately 58.69 amu.

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In the equation Brº + Cl₂ → 2CI+ Br₂, water appears as a product with a coefficient of 1.

In the equation NO₂ + SO₃²⁻ → NO₃+ S₂O₃²⁻, water does not appear.

In the equation Xe + Bry HXeO₄ + Br", water does not appear.

To balance the given skeletal equations under basic conditions and determine the coefficients of the species shown, we need to follow certain steps.

Write the unbalanced equation:

Brº + Cl₂ → CI+ Br₂

Balance the atoms other than hydrogen and oxygen:

Brº + Cl₂ → 2CI+ Br₂

Balance the oxygen atoms by adding water (H₂O) molecules:

Brº + Cl₂ + H₂O → 2CI+ Br₂

In the balanced equation, water appears as a product with a coefficient of 1.

To determine the oxidizing agent and reducing agent, we need to assign oxidation numbers to the elements in the reaction.

In the equation:

NO₂ + SO₃²⁻ → NO₃+ S₂O₃²⁻

The oxidation number of sulfur (S) increases from +4 in S₂O₃²⁻to +6 in S₂O₃²⁻. Therefore, sulfur is being oxidized and acts as the reducing agent.

In the same equation, the oxidation number of nitrogen (N) decreases from +4 in NO₂ to +3 in NO₃⁺. Therefore, nitrogen is being reduced and acts as the oxidizing agent.

In the equation:

Xe + Bry HXeO4 + Br"

The oxidation number of bromine (Br) decreases from 0 in Br" to -1 in Br2. Therefore, bromine is being reduced and acts as the oxidizing agent.

Water does not appear in this equation, so the coefficient for water is 0.

To summarize:

In the equation Brº + Cl₂ → 2CI+ Br₂, water appears as a product with a coefficient of 1.

In the equation NO₂ + SO₃²⁻ → NO₃+ S₂O₃²⁻, water does not appear.

In the equation Xe + Bry HXeO₄ + Br", water does not appear.

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The relationship between the enthalpy (ΔH) and entropy (ΔS) of a reaction that is never spontaneous is -ΔH, +ΔS option - B is correct answer.

When a reaction occurs spontaneously, the system doesn't require any additional energy input because the change in free energy is negative.

When the enthalpy change is negative and the entropy change is positive, the reaction is always spontaneous.

The free energy change is always positive and the reaction is never spontaneous if the reaction is endothermic (H positive) and the entropy change S is negative (less disorder).

Although a spontaneous reaction may result in an increase or decrease in entropy or enthalpy, it will always result in a decrease in free energy, which is a negative G.

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a) The greenhouse effect and blackbody radiation are interrelated because the latter plays a vital role in the former.

Blackbody radiation is the term used to define the emission of electromagnetic radiation from an object when it is heated.

These radiations have different wavelengths, and their intensities are determined by Planck's Law.

The greenhouse gases present in the earth's atmosphere have the property of absorbing and emitting radiation.

When solar radiation hits the earth's surface, it is absorbed and re-emitted as infrared radiation.

The greenhouse gases present in the atmosphere absorb this infrared radiation, thereby raising the temperature of the earth's atmosphere.

Hence, the greenhouse effect is the phenomenon where the presence of greenhouse gases causes the earth's temperature to rise.

b) The Bohr model of the atom has the following assumptions:

An electron in an atom moves in a circular orbit around the nucleus.

The energy of the electron in an atom is quantized, i.e., it can have certain discrete values only.

The angular momentum of the electron is quantized, i.e., it can have certain discrete values only.

An electron can move from one energy level to another by either absorbing or emitting radiation.

The frequency of the absorbed/emitted radiation is directly proportional to the energy difference between the two levels.

c) An experimental arrangement to measure the photoelectric effect can be sketched as follows:

    Light Source

            |

           V

       Collimator

            |

           V

      Monochromator

            |

           V

     Photoelectric

        Material

            |

           V

     Anode Plate

            |

           V

        Ammeter

Light Source:

Provides a source of light, usually a monochromatic (single-frequency) light such as a laser or a mercury lamp.

The frequency of the light can be controlled.

Collimator:

A device that ensures the light beams emitted from the light source are parallel and concentrated into a narrow beam.

Monochromator:

A device that selects a specific wavelength or frequency of light from the collimated beam, allowing for precise control of the incident light's frequency.

Photoelectric Material:

A metallic surface or a semiconductor material (photocathode) that exhibits the photoelectric effect.

It is placed in the path of the selected monochromatic light.

Anode Plate:

A positively charged electrode placed near the photoelectric material to collect the emitted electrons (photoelectrons).

The anode is connected to an ammeter to measure the photoelectric current.

Ammeter:

A device used to measure the magnitude of the photoelectric current. It indicates the flow of electrons from the photoelectric material to the anode plate.

The experimental setup allows the experimenter to vary the frequency (or wavelength) of the incident light and measure the corresponding photoelectric current.

By systematically changing the frequency and observing the current, one can investigate the threshold frequency, determine the relationship between frequency and kinetic energy of emitted electrons, and study other properties of the photoelectric effect.

d) The bandgap energy is given by:

Eg = hc/λ

where

Eg is the bandgap energy,

h is Planck's constant,

c is the speed of light, and

λ is the wavelength of light.

The bandgap energy of Si is given as 1.1 eV.

Therefore, we can find the maximum wavelength that could excite an electron from the valence band to the conduction band of Si using the following equation:

Eg = hc/λ1.1 eV

    = 4.14 × 10-15 eV s × 3 × 108 m/s / λλ

    = (4.14 × 10-15 eV s × 3 × 108 m/s) / 1.1 eVλ

    = 1.21 × 10-6 m or 1210 nm

Therefore, the longest wavelength that could be used to excite an electron from the valence band of Si to its conduction band is 1210 nm.

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The actual yield of the oxygen in the reaction is 4.32 g.

The equation of the reaction is;

Ba(ClO3)2 → BaCl2 + 3O2

Now we have that ;

Number of moles of the barium chlorate is;

Number of moles = mass/Molar mass

= 15 g/304 g/mol

= 0.049 moles

If 1 mole of barium chlorate produced 3 moles of oxygen

0.049 moles of barium chlortae will produce 0.049 * 3/1

= 0.147 moles

Mass of the oxygen produced = 0.147 moles * 32 g/mol

= 4.7 g

Then we have that;

Percent yield = Actual/Theoretical * 100/1

92 = x/4.7 * 100/1

92 * 4.7 = 100x

x = 92 * 4.7/100

x = 4.32 g

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Combustion reactions require oxygen, a fuel, and give off energy.

Combustion reactions, also known as burning, are chemical reactions that occur when a fuel combines with oxygen in the presence of an ignition source. The main answer to the question is that combustion reactions require all of the mentioned components: oxygen, a fuel, and they give off energy.

Oxygen is a crucial component in combustion reactions because it acts as an oxidizer. It combines with the fuel, which can be any combustible material such as wood, gasoline, or natural gas. The presence of oxygen enables the fuel to undergo oxidation, releasing energy in the form of heat and light.

Without a fuel source, combustion cannot occur. The fuel provides the carbon and hydrogen atoms necessary for the reaction. Different fuels have varying energy content and combustion characteristics, which can affect the intensity and efficiency of the reaction.

When a fuel and oxygen react, a chemical reaction takes place, resulting in the release of energy. This energy is in the form of heat and light, which is why combustion reactions often produce flames. The energy released during combustion can be harnessed for various purposes, such as heating, cooking, or powering engines.

In summary, combustion reactions normally require oxygen as an oxidizer, a fuel source to provide the necessary atoms, and they give off energy in the form of heat and light. These reactions are essential for various practical applications and play a vital role in our daily lives.

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Answer:

5 is the answer since I did this and got it rigt

Answer:

B

Explanation:

Sample B takes more drops for both P- and T-alkalinity tests to reach pH 8.3 and 4.5. So it is more acidic to begin with.

pH is equal for all three.

Now look at the drops amount

Higher the drops lower the solubility or its less acidic.

So sample A is most acidic then local then sample B

The hydrogen bonding of water is one of the main property of water which makes it responsible for all the other physical and chemical properties.

Water molecules are polar in nature and they form hydrogen bonds. Hence, they have a high boiling point , high specific heat and density. Water can exhibit the properties of an acid, as well as a base (amphoteric character). The water molecules are constantly moving and the hydrogen bonds continuously breaks and forms again. These hydrogen bonds are strong, which is the reason for the unique properties of water.

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The amount of energy required to eat 5.25 g of Titanium from 85.5 celsius to 132.5 celsius is 129 joules.

Absorbed or released amount of heat will be calculated by using the below formula as:

Q = mcΔT, where

m = mass of titanium = 5.25g

c = specific heat of titanium = 0.523 J/gram degree celsius

ΔT = change in temperature = 132.5 - 85.5 = 47 degree celsius

On putting these values on the above equation we get,

Q = (5.25)(0.523)(47) = 129 joules

Hence required heat is 129 joules.

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Answer:

i think 1:3

Explanation:

The mole fraction of methanol in the mixture is the ratio of the number of moles of methanol to the sum of number of moles of all the components in the mixture.The mole fraction of methanol in the mixture is 0.375.

Mole fraction of a component in a mixture is the ratio of the number of moles of that component to the total number of moles of all the components in the mixture.

Let nA be the number of moles of component A in the mixture and nB that of the component B. Then, mole fraction of A and B is written as:

xA = nA/ (nA + nB)

xB = nB/ (nA + nB)

Given that, number of moles of methanol = 3

number of moles of ethanol = 5 moles

total number of moles in the mixture  =  5 + 3= 8 moles.

Then mole fraction of methanol = 3 /8 = 0.375.

Therefore, the mole fraction of methanol in the mixture is 0.375.

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Yes, the presence of a material can cause a pure solvent (like water) to have a lower freezing point and a higher melting point. Both freezing point depression and melting point elevation are terms used to describe this occurrence.

Liquid molecules are weakly bonded, and their intermolecular forces of attraction are weaker than those of solid molecules.

This is because the molecules' potential energy, which holds them together in the crystal lattice of a solid, is smaller than the heat energy that is delivered to them during the process of changing from a solid to a liquid state.

This potential energy serves as a proxy for the solid's lattice energy.

The molecules lose their kinetic energy and approach one another when the temperature of a substance is lowered through the removal of heat from the substance or a reduction in pressure.

They gradually build more potential energy and stabilize. They turn into solids at this point. It's one of the reliable

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Answer:

B

Explanation:

Reactants: H20 and Oz; Product: H202

Heat required is mcΔT=100×0.39×50=1950 J

Solve any question of Thermodynamics with:-

The specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.

The specific heat capacity of the substance is calculated as follows;

Q = mcΔФ

where;

c = Q/mΔФ

c = (270) / (4.2 x 25)

c = 2.57 J/g⁰C

Thus, the specific heat of the substance that requires 270 J of energy to raise the temperature is 2.57 J/g⁰C.

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The ice sheet on Earth's surface serves as a barrier to stop seismic activity from occurring beneath it, according to the model of the planet's crust and mantle. The answer is option (a).

The topmost layer of the Earth is known as the crust, and it is normally made of solid rock. With a thickness ranging from 5 to 70 km, it is the thinnest layer. Tectonic plates, a term used to describe a number of distinct layers that make up the Earth's crust, move and interact with one another.

The crust may rise as a result of the mantle's reaction to the ice sheet's pressure. The ice then melts as a result of the crust rising. An ice sheet may potentially develop because to the mantle spreading's rapid temperature drop. The mantle can press up on the crust and raise it as a result of the ice sheet melting.

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