The process of boiling is considered to be a (1) chemical change, because a new substance is formed (2) chemical change, because a new substance is not formed (3) physical change, because a new substance is formed (4) physical change, because a new substance is not formed

The interspecific chemical messenger that benefits the producer is called an allelochemical.

Allelochemicals are chemical compounds produced by one species that affect the growth, survival, or reproduction of other species. These chemicals can have positive or negative effects on the recipient species, but they always benefit the producer.

For example, some plants produce allelochemicals that inhibit the growth of competing plants, giving them an advantage in the struggle for resources. Other allelochemicals attract predators or parasites of herbivores, providing protection for the producer. Allelochemicals can also be used in communication between species, such as pheromones used by insects to attract mates.

Overall, allelochemicals play an important role in shaping interactions between species in ecological communities.

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Answer: im pretty sure its D

Explanation:

The type of interaction that stabilizes the alpha (α) helix and the beta (β) pleated sheet structures of proteins is called hydrogen bonding.

Hydrogen holding is an extraordinary sort of dipole fascination between particles, not a covalent cling to a hydrogen iota. It results from the appealing power between a hydrogen particle covalently clung to an extremely electronegative molecule like a N, O, or F iota and another exceptionally electronegative iota.

Hydrogen bonds can occur in any molecule that has a hydrogen atom directly attached to an oxygen or nitrogen. When hydrogen is bonded to fluorine, hydrogen bonds also occur, but other molecules lack the HF group.

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Answer:

2.24 L

Explanation:

Calculating the final volume

V2 = V1 • (T2 / T1)

V2 = 2.33 L • (293 K / 304 K)

V2 = 2.24 L

Answer

Acid

Procedure

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.

As with the hydrogen-ion concentration, the concentration of the hydroxide ion can be expressed logarithmically by the pOH.

We have that pH + pOH = 14

Therefore pH= 14- pOH

In this case, we have pH= 14-9 = 5

A pH of 5 is similar to that of coffee, therefore the best answer is: acid

Answer:

1.43 M

Explanation:

We'll begin by calculating the number of mole of the solid. This can be obtained as follow:

Mass of solid = 8.60 g

Molar mass of solid = 21.50 g/mol

Mole of solid =?

Mole = mass / molar mass

Mole of solid = 8.60 / 21.50

Mole of solid = 0.4 mole

Next, we shall convert 280 mL to litre (L). This can be obtained as follow:

1000 mL = 1 L

Therefore,

280 mL = 280 mL × 1 L / 1000 mL

280 mL = 0.28 L

Thus, 280 mL is equivalent to 0.28 L.

Finally, we shall determine the molarity of the solution. This can be obtained as illustrated below:

Mole of solid = 0.4 mole

Volume = 0.28 L

Molarity =?

Molarity = mole / Volume

Molarity = 0.4 / 0.28

Molarity = 1.43 M

Thus, the molarity of the solution is 1.43 M.

The Lewis dot structure for hydrogen should show one electron. Hydrogen (H) has one electron in its outermost energy level, known as the 1s orbital.

In the Lewis dot structure, also known as the Lewis structure or electron dot structure, the valence electrons of an atom are represented by dots placed around the atomic symbol.

Hydrogen (H) has one electron in its outermost energy level, known as the 1s orbital. Therefore, in the Lewis dot structure for hydrogen, we represent this lone valence electron as a single dot placed next to the atomic symbol H. Since hydrogen has only one electron, only one dot is shown in its Lewis dot structure.

The Lewis dot structure for hydrogen is H •

The dot represents the single valence electron of hydrogen.

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Answer:

6

What do AIA, SAG, AFP and AMA all stand for? Select four options.

American Institute of Architects

American Society of Mechanical Engineers

American Medical Association

Screen Actors Guild

Association for Finance Professionals

Professional Colleges

As a result, 0.231liters of the 0.150M potassium iodide solution would be required to thoroughly react with the supplied lead(II) nitrate solution.

When a solution of potassium iodide is introduced to a solution of lead nitrate in a test tube, a yellowish solid precipitates.

Lead iodide is a whitish solid. Along with lead iodide, potassium nitrate is generated. This is a reaction with two displacements.

The reaction between lead nitrate [Pb(NO3)2] and potassium iodide (Kl) results in the creation of potassium nitrate (KNO3) and a yellow precipitate of lead iodide (PbI2).

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Answer:

(i) In a bond amortization schedule, the book value represents the remaining amount of the bond principal that hasn't been paid off at a given point in time. When a bond is first issued, its book value equals its face value. As payments are made over the life of the bond, a portion of these payments reduces the book value. By the end of the bond's life, its book value will be zero, as the entire principal will have been paid off.

(ii) The formula for the book value B at time k, where k is the number of periods elapsed, is B = C + Cg - jan-kj.

Here:

- C is the redemption amount,

- g is the modified coupon rate per period,

- j is the yield rate per period, and

- a_n-kj is the present value of an annuity immediate with n - k periods at the yield rate j.

This formula states that the book value at any time k is the redemption amount plus the present value of the future coupon payments (Cg), minus the present value of the annuity that represents the repayments of the bond (jan-kj).

The amortized amount at time k is the change in the book value from time k-1 to time k, plus the coupon payment at time k. It represents the portion of the bond's principal (and interest) that has been repaid up to time k.

(iii) If K is defined as the present value of the redemption value C, according to the Makeham formula, (C-K) would represent the difference between the redemption value of the bond and its present value. This difference is the amount of interest that will accumulate over the life of the bond. In other words, (C-K) can be interpreted as the total interest that the bondholder will earn from holding the bond until redemption, assuming that all coupon payments are reinvested at the yield rate j.

Explanation:

Answer:

90 mL

0.09 Liters

Explanation:

Givens

1 cc of solution = 1 mL

0.75 cc / min needed to go in intravenously.

2 hours needed.

? Liters

Solution

1 hour = 60 minutes

1 hours = 2 * 60 = 120 minutes

rate = 0.75 cc/minute

Liters = rate * time

Liters = 0.75 cc * 120 minutes

Liters = 90 cc

That's not the answer.

1 Liter has 1000 mL or ccs

x Liter has 90 mL          

Equation

1/x = 1000 / 90

Solution

Cross multiply

1000x = 90*1           Divide by 1000

x = 90/1000

x = 0.09 Liters.

Answer:

both lithium and sodium are alkali metals

Answer:

Explanation:

Answer: both lithium and sodium are alkali metals

Answer:

Diamond

Explanation:

The answer is gotten from Act 2, Scene 1 of the play by Shakespeare titled "Macbeth". In this scene, we see that Banquo met Macbeth late in the night where they had a profound conversation about the gift of diamond which king Duncan had given to Banquo to deliver to Macbeth.

To determine the mass of Mg(NO3)2 present in the solution, we need to use the formula: Mass = Volume × Concentration × Molar mass. The mass of Mg(NO3)2 present in 129 mL of a 0.450 M solution is approximately 8.613 grams.

Given: Volume of solution = 129 mL. Concentration of Mg(NO3)2 solution = 0.450 M. First, we need to convert the volume of the solution from milliliters (mL) to liters (L): 129 mL = 129/1000 L = 0.129 L. Next, we need to calculate the molar mass of Mg(NO3)2: Molar mass of Mg(NO3)2 = (1 × atomic mass of Mg) + (2 × atomic mass of N) + (6 × atomic mass of O) Molar mass of Mg(NO3)2 = (1 × 24.31 g/mol) + (2 × 14.01 g/mol) + (6 × 16.00 g/mol) Molar mass of Mg(NO3)2 = 148.31 g/mol Now, we can calculate the mass of Mg(NO3)2: Mass = Volume × Concentration × Molar mass Mass = 0.129 L × 0.450 M × 148.31 g/mol Mass = 8.613 g. Therefore, the mass of Mg(NO3)2 present in 129 mL of a 0.450 M solution is approximately 8.613 grams.

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Answer:

a gas dissolved in a solid

Explanation:

The ice that comprise of small amount of dissolved air represent the type of soluton that have a solid dissolved in a gas.

Gas could be considered as the one of the four fundamental states of matter.

A pure gas should be made of individual atoms, elemental molecules that consist from one type of atom, or compound molecules that consist of a variety of atoms.

A gas mixture could be in the form of air that comprise a variety of pure gases.

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The correctly balanced equation for a reaction of aluminium oxide and zinc is as follows: 3Zn + Al2O3 → 2Al +3ZnO

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Explanation:

solvent bc when you remove it it becomes more concentrate

The integrated rate equation for the first-order reaction is as follows:

ln [H2O2] = −kt + ln [H2O2]₀

The concentration of H2O2 after 4000 seconds is 0.040 molar.

The integrated rate equation for the first-order reaction is as follows:

ln [H2O2] = −kt + ln [H2O2]₀

Where[H2O2]₀ is the initial concentration of H2O2;

[H2O2] is the concentration of H2O2 after time t;ln is the natural logarithm;k is the rate constant of the reaction;t is the elapsed time of the reaction In this question, we need to determine the concentration of H2O2 after 4000 seconds. The initial concentration of H2O2 is not provided, so we must assume that it is some concentration of H2O2 at time zero. We will use the integrated rate equation to solve for [H2O2] at 4000 seconds.

ln [H2O2] = −kt + ln [H2O2]₀

ln [H2O2] = −(8.0 × 10⁻⁴ s⁻¹) × (4000 s) + ln [H2O2]₀

ln [H2O2] = −3.2 + ln [H2O2]₀

[H2O2] = e^(−3.2 + ln [H2O2]₀)

[H2O2] = (1.0 × 10⁻³⁰) × [H2O2]₀

At time zero, the concentration of H2O2 is

[H2O2]₀ = 0.040 M.

[H2O2] = (1.0 × 10⁻³⁰) × [H2O2]₀

[H2O2] = (1.0 × 10⁻³⁰) × (0.040 M)

[H2O2] = 0.040 × 10⁻³⁰

[H2O2] = 4.0 × 10⁻³² M

[H2O2] = 0.040 molar

Therefore, the concentration of H2O2 after 4000 seconds is 0.040 molar.

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Explanation:

T1/V1 = T2/V2

V2 = T2 x V1/T1

V2 = 296.15x535/319.15

V2 = 496.44mL

The work performed on the surroundings by the one-mole ideal gas, which is expanded from 1.00 liter to 3.23 liters against a constant external pressure of 1.00 atm, is -225.51 J.

To calculate the work performed on the surroundings by the ideal gas, we need to use the formula:

W = -PextΔV

where W is the work done on the surroundings, Pext is the external pressure, and ΔV is the change in the volume of the gas.

In this case, we have a one-mole ideal gas that is expanded from 1.00 liter to 3.23 liters against a constant external pressure of 1.00 atm. So, the change in volume is:

ΔV = 3.23 L - 1.00 L = 2.23 L

Since the pressure is constant, we can use the given value of 1.00 atm for Pext. Therefore, the work performed on the surroundings by the ideal gas is:

W = - (1.00 atm) (2.23 L) = -2.23 atm·L

To convert this value to joules, we need to use the following conversion factor:

1 atm·L = 101.325 J

So, the work performed on the surroundings by the ideal gas is:

W = (-2.23 atm·L) (101.325 J/atm·L) = -225.51 J

The negative sign in the answer indicates that the work is performed by the gas on the surroundings, which is consistent with the fact that the gas is expanding.

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Answer:

If the object has an irregular shape, the volume can be measured using a displacement can. The displacement can is filled with water above a narrow spout and allowed to drain until the water is level with the tap. As the irregular object is lowered into the displacement can, the water level rises.

Explanation:

Answer:

Elements

Explanation:

Elements cannot be broken down into a simpler substance

Answer:

Area under graph: Distance = Velocity x Time

Explanation:

Answer:

A. Because you have to simplify

Answer:

decomposition

Explanation:

i dont cap

Answer: volume of gas at 175°C = 18.10mL.

Given :

• Temperature (T1 = 175°C

• Volume (V1 ) = 132 mL

• Temperature (T2) = 24 °C

• Volume 2 = ....mL?

We will consider Charles law "volume of an ideal gas at constant pressure is directly proportional to the absolute temperature"

• Represented as :

Replacing the given parameters into chales law equation , we get that V2 =

This means that the volume of gas at 175 = 18.10mL.

In solution 4 of part b, both the hydronium concentration and hydroxide concentration are 1 M due to the neutralization reaction between HCl and NaOH. The initial concentrations of H₃O⁺ and OH⁻ were 0.1 M, but they reacted to form water and resulted in equal final concentrations of 1 M for both ions.

To calculate the hydronium and hydroxide concentrations for solution 4 in part b, we need to first understand the equation for the reaction that occurred.

The equation given is: HCl + NaOH -> NaCl + H₂O

This tells us that one mole of HCl reacts with one mole of NaOH to produce one mole of NaCl and one mole of water.

Based on this equation, we know that the initial concentration of hydroxide ions (OH-) in solution 4 is equal to the initial concentration of sodium hydroxide (NaOH), which was given as 0.1 M.

Next, we need to determine the concentration of hydronium ions (H₃O⁺). Since HCl is a strong acid, it completely dissociates in water to produce H₃O⁺ and Cl⁻ ions. Therefore, we can assume that the initial concentration of H₃O⁺ is equal to the initial concentration of HCl, which was also given as 0.1 M.

Now, let's consider what happens when the HCl and NaOH are mixed together. They react to form NaCl and water, which means that the concentrations of H₃O⁺ and OH⁻ will change.

From the equation, we can see that the reaction consumes one mole of HCl and one mole of NaOH. This means that the final concentration of HCl and NaOH will both be zero.

To determine the final concentration of OH-, we need to use the fact that the reaction produces one mole of water for every mole of NaOH that reacts. Therefore, the final concentration of OH⁻ will be equal to the initial concentration of NaOH (0.1 M) divided by the volume of the solution.

If we assume that the volume of the solution is 100 mL (as stated in the question), then the final concentration of OH- will be:

[OH⁻] = 0.1 M / 0.1 L = 1 M

Finally, we can use the fact that the concentration of H₃O⁺ and OH⁻ must be equal in a neutral solution to determine the final concentration of H₃O⁺.

Since the final concentration of OH⁻ is 1 M, we know that the final concentration of H₃O⁺ must also be 1 M.

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Answer:

Rock

Explanation:

Let's calculate the density of each object:

Rock:

\(Density = \frac{mass}{volume}=\frac{8.5\ g}{4.5\ mL}=1.9\ g/mL\)

Pencil:

\(Density = \frac{mass}{volume}=\frac{2.4\ g}{4.5\ mL}=0.53\ g/mL\)

Therefore the rock is denser.

Answer:

Metal.

Explanation:

I think its the metal because when you cut it, it had metal in it.