The Adálie penguins feed on krill that live on the underside of ice sheets. Which of the following would help Adálie penguins survive during the melting of Antarctic sea ice? (4 points)
Migrating farther into the sea
Breeding during summer months
Growing strong toe nails to grip ice
Spending more time raising their young

Green plants use two molecules, carbon dioxide (CO₂) and water (H₂O), to make glucose through the process of photosynthesis.

During photosynthesis, plants capture energy from sunlight and convert it into chemical energy stored in glucose. The process occurs in the chloroplasts, which contain the pigment chlorophyll that gives plants their green color. Carbon dioxide is obtained from the atmosphere through tiny openings in the plant's leaves called stomata.

Water is absorbed by the roots and transported to the leaves through specialized tissues called xylem. In the first stage of photosynthesis, known as the light-dependent reactions, light energy is absorbed by chlorophyll, which triggers a series of chemical reactions that produce energy-rich molecules like ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).

These energy carriers are then utilized in the next stage. In the second stage, called the light-independent reactions or the Calvin cycle, carbon dioxide from the atmosphere enters the leaf and combines with the energy-rich molecules ATP and NADPH.

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The time it will take for 99.9049% of the released Sr-90 to disappear is approximately  96.93 years.

To calculate this, we can use the concept of half-life. The half-life of Sr-90 is given as 29.1 years. The percentage of Sr-90 that remains after a certain number of half-lives can be calculated using the formula:

Remaining percentage = (1/2)^(number of half-lives)

To determine the time it will take for 99.9049% of the Sr-90 to disappear, we can use the concept of half-life.

Given:

Half-life of Sr-90 (t₁/₂) = 29.1 years

Remaining percentage (R) = 0.099049 (99.9049%)

We can use the formula:

time = (number of half-lives) * (half-life of Sr-90)

To calculate the number of half-lives, we can use the equation:

R = (1/2)^(number of half-lives)

Taking the logarithm of both sides:

log(R) = (number of half-lives) * log(1/2)

Substituting the values:

log(0.099049) = (number of half-lives) * log(1/2)

Solving for the number of half-lives:

(number of half-lives) = log(0.099049) / log(1/2)

Now we can calculate the time:

time = (number of half-lives) * (half-life of Sr-90)

Substituting the given values:

time = (log(0.099049) / log(1/2)) * 29.1

To simplify the expression, let's evaluate the logarithms and perform the calculations:

log(0.099049) ≈ -1.003

log(1/2) ≈ -0.301

Using these values, we can simplify the expression:

time ≈ (-1.003 / -0.301) * 29.1

Simplifying further:

time ≈ 3.33 * 29.1

Calculating the product:

time ≈ 96.93

Therefore, it will take approximately 96.93 years for 99.9049% of the Sr released in a nuclear reactor accident to disappear.

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The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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The new volume of the ballon at the same temperature is 17.65litres.

What is Boyles Law?

Boyles Law states that the product of pressure and volume is constant until the temperature remains constant.

PV = constant defines the Boyles law.

As given,

V₁ = 15L, P₁ = 1.0atm, P₂= 0.85atm

P₁V₁ = P₂V₂

Substitute values respectively,

1 × 15 = 0.85 × V₂

    V₂ = 15/0.85

     V₂ = 17.65L

Hence, the new volume of the balloon at the same temperature is 17.65L.

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Due to their stronger metallic bonding and more compact atomic structure, the transition elements have higher melting and boiling temperatures and are often denser than the alkali metals.

Elements from Group 1 have similar properties. All of them are supple silver metals. These metals are extremely reactive and have low melting temperatures due to their low ionisation energy. As you descend the chart, this family becomes more reactive.

The d orbitals of transitional elements are only partially filled. A transition element is defined by IUPAC as an element that may form stable cations and has an electron d subshell that is only partly filled.

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The best explanation for the phenomenon of a prism dispersing white light into a spectrum is that different frequencies of visible light move at different speeds inside the prism. This is known as the process of refraction.

The correct option is D.

Dispersion of light is the separation of white light into its component colors.

When white light enters a prism, the different colors (wavelengths) that make up white light refract, or bend, at slightly different angles as they pass through the prism.

This is due to the fact that different colors of light have different refractive indices or the degree to which light bends as it passes through a medium. This means that each color of light is separated, forming a spectrum of colors that ranges from red to violet.

This effect can be seen in everyday life, such as in a rainbow, which is formed when sunlight is refracted by water droplets in the air.

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The molarity of silver ion in the original solution is 0.057 M. To get the molarity of silver ion in the original solution, we need to first determine the moles of silver nitrate that reacted.

We can use the equation: AgNO3 + KCl → AgCl + KNO3
From the equation, we know that 1 mole of silver nitrate reacts with 1 mole of potassium chloride to produce 1 mole of silver chloride.
Using the volume and concentration of the silver nitrate solution, we can calculate the moles of silver nitrate:
Molarity = moles of solute / volume of solution (in liters)
Molarity = moles of AgNO3 / 0.0441 L
We don't know the moles of AgNO3 yet, but we can use the mass of the precipitate (0.271 g) to find the moles of silver chloride:
moles of AgCl = mass of AgCl / molar mass of AgCl
molar mass of AgCl = 107.87 g/mol
moles of AgCl = 0.271 g / 107.87 g/mol = 0.00251 mol
Since 1 mole of AgNO3 produces 1 mole of AgCl, the moles of AgNO3 that reacted is also 0.00251 mol.
Molarity = 0.00251 mol / 0.0441 L = 0.057 M
Therefore, the molarity of silver ion in the original solution is 0.057 M.

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Answer:

sorry dear i don't know sorry

The question is: Calculate the molar fractions of the components of a solution made up of: 250 g of water, 50 g of acetic acid and 25 g of sodium chloride.

Answer: The mole fraction of water, acetic acid and sodium chloride is 0.916, 0.054, and 0.028.

Explanation:

As number of moles is the mass of substance divided by its molar mass.

Therefore, moles of given species are calculated as follows.

The number of moles of water (molar mass = 18 g/mol):

\(Moles = \frac{mass}{molar mass}\\= \frac{250 g}{18 g/mol}\\= 13.88 mol\)

The number of moles of acetic acid (molar mass = 60.052 g/mol):

\(Moles = \frac{mass}{molar mass}\\= \frac{50 g}{60.052 g/mol}\\= 0.832 mol\)

The number of moles of sodium chloride (molar mass = 58.44 g/mol):

\(Moles = \frac{mass}{molar mass}\\= \frac{25 g}{58.44 g/mol}\\= 0.427 mol\)

Therefore, mole fraction of each component is calculated as follows.

Mole fraction of water:

\(Mole fraction = \frac{moles of water}{Total moles}\\= \frac{13.88}{13.88 + 0.832 + 0.427}\\= \frac{13.88}{15.139}\\= 0.916\)

Mole fraction of acetic acid:

\(Mole fraction = \frac{moles of water}{Total moles}\\= \frac{0.832}{13.88 + 0.832 + 0.427}\\= \frac{0.832}{15.139}\\= 0.054\)

Mole fraction of NaCl:

\(Mole fraction = \frac{moles of water}{Total moles}\\= \frac{0.427}{13.88 + 0.832 + 0.427}\\= \frac{0.427}{15.139}\\= 0.028\)

Thus, we can conclude that mole fraction of water, acetic acid and sodium chloride is 0.916, 0.054, and 0.028.

Formic acid (ch2o2)  on reaction with water undergoes dissociation reaction.

Formic acid  is the acid released by ant when it bites which causes us irritation.

It's formula is CH2O2 or HCOOH. and pH is 3.75.

In the case of dehydration, one hydrogen atom in the water molecule joins the hydroxyl group in the trans formic acid to form a new water molecule, while the hydrogen bonded to carbon in the acid breaks off to regenerate a water molecule.

Formic acid dissociates in water according to the equation:

HCOOH (aq) + H2O (l) = H3O + (aq) + HCOO- (aq)

Formic acid is the simplest carboxylic acid, containing a single carbon. Occurs naturally in various sources including the venom of bee and ant stings, and is a useful organic synthetic reagent. Principally used as a preservative and antibacterial agent in livestock feed.

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The mass of 4.50 x 10²² formula units of CoSO₄ will be 11.57 g

The formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.

As 1 mole (i.e, 6.023 x 10²³ molecules) of CoSO₄ weighs 154.99 g

Therefore,

4.50 x 10²² formula units (Molecules) of CoSO₄ weighs

154.99 / 6.023 x 10²³  x  4.50 x 10²²  = 11.57 g CoSO₄

Hence, The mass of 4.50 x 10²² formula units of CoSO₄ will be 11.57 g

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697.455 x \(10^{22}\) g/mol is the mass of 4.50 x \(10^{22}\) formula units of \(COSO_4\).

A formula unit is the chemical formula of an ionic compound that lists the ions in the lowest ratio that equals a neutral electrical charge.

To find the mass of 4.50 x 1022 formula units of \(COSO_4\), we need to multiply 4.50 x 1022 with molar mass.

4.50 x \(10^{22}\) x 154.99 g/mol

697.455 x \(10^{22}\) g/mol

Hence, 697.455 x \(10^{22}\) g/mol is the mass of 4.50 x \(10^{22}\) formula units of \(COSO_4\)

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Answer: 1.09 Liers

Explanation:

I did the problem and got it correct.

Answer:

A. 1.09

Explanation:

I did the Chemistry Exam

Water-reactive solids require identification with a placard, regardless of the shipment weight.

Among the given options, the chemical that requires identification with a placard, regardless of the shipment weight, is water-reactive solids. Water-reactive solids are substances that react vigorously or even explosively when they come into contact with water. Due to their potential for hazardous reactions, they are regulated for transportation and require special handling and identification.

Water-reactive solids pose significant risks during transportation because even a small amount of moisture or humidity can trigger a violent reaction. These reactions can release toxic gases, generate heat, or produce flammable materials, posing hazards to human health, the environment, and the safety of the transportation system.

To ensure proper identification and handling, water-reactive solids must be labeled with a placard that indicates their hazardous nature. This placard serves as a visual warning to alert emergency responders and others to the presence of a potentially dangerous substance.

Regardless of the weight of the shipment, the identification requirement for water-reactive solids remains consistent. This is because their reactivity with water poses a potential risk regardless of the quantity being transported. Even a small amount of a water-reactive solid can cause significant damage and hazards.

Therefore, the correct answer is A. water-reactive solids, which require identification with a placard, regardless of the shipment weight.

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Water-reactive solids always require a placard for identification regardless of the shipment's weight. This is due to their inherent hazard of causing dangerous reactions when coming into contact with water.

The chemical that requires identification with a placard, regardless of the shipment's weight, is water-reactive solids (option A). This is because water-reactive solids can pose a significant danger if they come into contact with water, leading to possible reactions such as fire or explosion.

By contrast, materials such as flammable liquids, nonflammable gases, and air-reactive solids may indeed require placarding, but this is usually dependent on the weight of the shipment, in line with Department of Transportation (DOT) regulations. However, due to their inherent hazard, water-reactive solids always need to be identified by a placard.

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Answer:

chicken fox

Explanation:

Answer:

Option D, 116 g of NaNO3

Explanation:

An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.

At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer

An object is given a charge of positive 7mC. A bunch of electrons were removed from the object describes what happened when the object was charged. Correct option is A.

When electrons are added to or taken away from an object, an electrical charge is produced. An object acquires a negative charge when electrons are introduced to it because electrons have a negative charge. An object acquires a positive charge when its electrons are removed.

When two materials rub against one another or come into touch, an electrical charge is produced. Electrons can actually rub off of one thing and onto another when the materials are in touch. This does not imply that any two materials will move electrons when rubbed together. Other materials are far more likely to take electrons, whereas some materials are much more ready to offer electrons. A triboelectric series is a list of materials arranged according to their capacity to donate electrons.

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Name of Pb(NO3 )2 is Lead(II) nitrate.

Pb(NO3)2 is ionic as well as covalent

Pb is the symbol of lead and NO3  is a complex ion called nitrate. It has one nitrogen and three oxygens. Pb(NO3)2 is ionic as well as covalent. NO3 is covalent in nature because both nitrogen and oxygen are non-metals and therefore an ionic bond cannot be formed between them.

Ionic compounds are formed when a metal reacts with a nonmetal whereas covalent compounds are formed when two non -metals react with each other. Binary compounds containing hydrogen are usually covalent compounds as hydrogen is a non - metal.

An ionic bond  donates an electron to the other atom in the bond whereas electrons in a covalent bond are shared equally between the atoms.

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In summary, the molecules that can exhibit hydrogen bonding as a pure liquid are water, ethanol, and ammonia.

Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as oxygen, nitrogen, or fluorine. This creates a partial positive charge on the hydrogen atom and a partial negative charge on the electronegative atom.

Based on this, molecules that contain these electronegative atoms can exhibit hydrogen bonding in their pure liquid state.

The molecules that can exhibit hydrogen bonding as a pure liquid include:
1. Water (H2O): It contains two hydrogen atoms bonded to an oxygen atom, allowing for extensive hydrogen bonding between neighboring water molecules.
2. Ethanol (C2H5OH): It has an -OH group, allowing for hydrogen bonding to occur.
3. Ammonia (NH3): It contains a hydrogen atom bonded to a nitrogen atom, which can form hydrogen bonds with neighboring ammonia molecules.

Other molecules such as carbon dioxide (CO2) and methane (CH4) do not contain electronegative atoms capable of hydrogen bonding and, therefore, cannot exhibit hydrogen bonding in their pure liquid state.

In summary, the molecules that can exhibit hydrogen bonding as a pure liquid are water, ethanol, and ammonia.

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Answer:

50 Points Help 1) Find the mass of 250.0 mL of benzene. The density of benzene is 0.8765 g/mL.  

7) What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3.

Answer:

At 13.6 C, a 1.2 mole sample of a gas exerts a pressure of 2.4 atmospheres. 1 point If you were solving for volume, what number would you use for temperature in the ideal gas law equation (PV = nRT)? о O 13.6 o 1.2 0 24 O 286.6 0 275.4

Thank You and All Answers are found on URL below:

There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the  nature of radioactive decay does not support the given statement.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. Decay of radioactive element always comes under first order kinetics.

The rate law for first order kinetics is

K=(2.303/T)×log(a/a-x)

half life=0.693/K

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

Consistency and predictability are imperatives to the experience of a safe environment.  The nature of radioactive decay does not support this.

Therefore, the  nature of radioactive decay does not support the given statement.

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When adding ice to a hot soup, it is generally recommended to use ice made from potable or drinkable water.

The water used to make the ice should be clean and free from any contaminants that could affect the taste or safety of the soup.

It is advisable to use filtered or purify water to make the ice to ensure that it is of good quality. This helps prevent any unwanted flavors or impurities from transferring to the soup.

Using tap water can also be acceptable if it meets the drinking water standards in your area and is considered safe for consumption. However, if you have concerns about the quality of your tap water, using filtered water is a safer option.

Ultimately, the goal is to add ice made from water that is safe and of good quality to avoid any negative impact on the taste or safety of the soup.

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The molarity of an acetic acid solution if 25.00 ml of 0.112 m sodium hydroxide solution is required to neutralize 35.00 ml of acetic acid is 0.08M

What is the molarity of acetic acid?

The concentration is provided in percent by mass (w/w), the molarity of concentrated acetic acid (CH3COOH) Acetic acid (CH3COOH) has a molecular weight of 60.05 g/mol.

To neutralize acid and base, moles of acid should be equal to moles of base

Moles of CH3COOH= moles of NaOH

nCH3COOH=n NaOH

(Molarity*Volume)CH3COOH=(Molarity*Volume)NaOH

(Molarity)CH3COOH*35ml=0.112M*25ml

Molarity of CH3COOH=0.112*25/35

                                    =0.08M

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Answer:

Renewable energy

Explanation:

on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.

Answer:

renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.

fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.

Answer:

I found this, hope it works

Explanation:

As the mass of the noble elements increases the boiling point gradually decreases and the graph of the two parameters is a straight line graph with downward slope.

It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.

Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.

The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.

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The number of atomic orbitals is the same for all elements in a period. Every element in the top row (the first period), for example, has only one orbital for its electrons. The electrons of all the elements in the second row (second period) have two orbitals. Every row adds an orbital as you progress down the table.

I hope this helps <3

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Answer:

1 cl =10 ml

so

4.22cL= 4.22×10= 42.2 mL

Yes, to determine the molar mass of an unknown solute from the freezing point depression the freezing points of both the pure solvent and the solution need to be measured.

The depression of the freezing point is a and it is given by the following formula,

ΔT f = T°f - T f

Here T°f is the freezing point of pure solvent

T f is the freezing point of the solution made by adding non-volatile solute to solvent

The freezing point depression is directly proportional to the molality of the solution

T(f) ∝ m

T(f)= K f x m

Here K f is the proportionality constant.

Hence, to determine the molar mass of an unknown solute from the freezing point depression the freezing points of both the pure solvent and the solution need to be measured.

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