? divided by 230 equals 273.1

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Zebras are social animals that live together in groups. They help the local ecosystem by grazing on dry, hardened grass that is too tough for other species (such as wildebeest, ostriches, and antelopes) to digest. Every zebra is important, But habitat loss due to human encroachment, agricultural practices, and livestock grazing remains an issue in the ongoing conservation of this species. These problems seem to be especially prevalent in the southern half of their range and account for much of the recent population decline.

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The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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To calculate the percentage of global mismanaged plastic that comes from the US, we can follow these steps:

Step 1: Convert the US contribution from tons per month to tons per year.

US contribution = 0.022 million tons per month * 12 months = 0.264 million tons per year

Step 2: Calculate the percentage.

Percentage = (US contribution / Global mismanaged plastic) * 100

Percentage = (0.264 million tons per year / 31.9 million tons per year) * 100

Calculating this expression gives:

Percentage = 0.828 %

Therefore, the US contributes approximately 0.828% of the global mismanaged plastic.

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The pressure of the gas is 5.52 atm

Mass of CO2 (dry ice) = 9.70 gVolume of the balloon after the solid CO2 sublimes = 1.00 LTemperature of the balloon = 298 KWe need to find out the pressure of the gas. The molar mass of CO2 is:Molecular mass of C = 12.01 g/molMolecular mass of O = 15.99 g/molMolecular mass of CO2 = 12.01 + (2 × 15.99) = 44.01 g/molNow, the number of moles of CO2 = mass/molar mass= 9.70/44.01 = 0.220 molThe Ideal Gas Law is represented by the formula PV = nRT,where P = pressureV = volume of the gasn = number of moles of the gasR = gas constant = 0.0821 L atm/(mol K)T = temperature of the gasNow substituting the values in the Ideal Gas Law,we getP = nRT / V= (0.220 mol × 0.0821 L atm/(mol K) × 298 K) / 1.00 LP = 5.52 atmTherefore, the pressure of the gas is 5.52 atm.

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Answer:

last option is correct.

Air molecules surrounding the metal will speed up and metal molecules will slow down

Explanation:

the metal cools when placed in room temperature air which causes surrounding air to heat up.

the speed of molecules slow down for any material which cools and molecules speed increases when any material heats up

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The ratio of the mass of compounds:

a. 2Na + Cl\(_{2}\) → 2NaCl = 46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8

What is a  molecular mass?

Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.

Calculation:

a. 2Na + Cl\(_{2}\) → 2NaCl

(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)

(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)

46 + 70 → 46 : 70

b. H\(_{2}\)O + NaO → 2NaOH

(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)

(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)

2 : 16 + 23 : 16 → 46 : 32 : 2

1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H\(_{2}\)O

(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)

(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)

1 : 35 + 23 : 35 → 23: 35 + 2: 16

1 : 35 + 23 : 35 → 23 : 35 + 1: 8

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Answer:

30000

Explanation:

6/100×500000 =30000

Answer:

I mean If you're asking a question, then yes.

Answer:

122.5 Joule, or 122.5 j

Explanation:

Given,

mass of the object (m) = 5 kg

velocity of the object (v) = 7 m/s

Kinetic energy = \(\frac{1}{2}\) × m × v²

Applying the formula:

Kinetic energy = \(\frac{1}{2}\) × 5 × 7²

⇒ \(\frac{1}{2}\) × 5 × 7 × 7

⇒ \(\frac{245}{2}\)

⇒ 122.5 Joule, or 122.5 j

Kinetic energy is the energy that an object gains as the result of the motion.  It also depends on the mass of the object and force with which the motion is applied.  In the given question, the mass of the object is 5 kg and the force of the velocity by which it is moving is 7 m/s.

Answer:

1.48×10²⁴ Cu atoms

Explanation:

For this question you need to use Avogadro's number 6.022×10²³atoms.

2.45 moles of Cu ×\(\frac{6.022x10x^{23} atoms }{1 mole}\)= 1.47539×10²⁴ atoms.

The moles cancel out so you are left with atoms.

Since there are 3 significant figures in the question there should be 3 significant figures in your answer, which is 1.48×10²⁴ Cu atoms.

Answer:

The average atomic mass of zinc is 65.38 u.

Explanation:

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The concentration of AB at 21 s is 0.526 M.

The data below show the concentration of AB versus time for the following reaction:

AB(g)→A(g)+B(g)Time (s)  [AB] (M)0  0.95050  0.459100  0.302150  0.225200  0.180250  0.149300  0.128350  0.112400  0.0994450  0.0894500  0.0812

Determine the value of the rate constant:

The reaction is a first-order reaction. The concentration of AB changes as follows:

[AB]t = [AB]0e^-ktln

([AB]t/[AB]0) = -ktln

(0.459/0.950) = -k(

0.693)k = 1.88 × 10^-3 s^-1

The rate constant value is 1.88 × 10^-3 s^-1.

Predict the concentration of AB at 21 s.

The formula for a first-order reaction is given by ln

([A]t/[A]0) = -ktln([AB]t

[AB]0) = -kt[AB]t = [AB]0 e^-kt

[AB]t = (0.950) e^-(1.88 × 10^-3)(21)[AB]t = 0.526 M.

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The largest amount of electrons released was around 1.30 × 10¹⁶, and their kinetic energy was around 3.125 × 10¹⁶ eV. The released electrons move at a speed of around 2.41 × 10⁶ m/s.

To calculate the maximum number of electrons emitted, we can use the equation:

Number of electrons = Energy absorbed / Energy required to remove one electron

The energy required to remove one electron is given by the work function, which is 2.40 eV. To convert the energy absorbed from Joules to electron volts (eV), we use the conversion factor: 1 eV = 1.6 × 10⁻¹⁹ J.

First, convert the energy absorbed to eV:

\(Energy absorbed = 5.00 \times 10^{-3} \, \text{J} \times \left( \frac{1 \, \text{eV}}{1.6 \times 10^{-19} \, \text{J}} \right)\)

Next, calculate the maximum number of electrons emitted:

Number of electrons = Energy absorbed / Work function

Now, to determine the kinetic energy and velocity of the electrons emitted, we can use the equations:

Kinetic energy = Energy absorbed - Work function

\(\text{Velocity} = \sqrt{\frac{2 \times \text{Kinetic energy}}{m}}\)

Please note that we will be assuming non-relativistic velocities for this calculation.

Let's perform the calculations:

\(Energy absorbed = $5.00 \times 10^{-3} , \text{J} \times \left(\frac{1 , \text{eV}}{1.6 \times 10^{-19} , \text{J}}\right) = 3.125 \times 10^{16} , \text{eV}$\)

\(Number of electrons = $\frac{3.125 \times 10^{16} , \text{eV}}{2.40 , \text{eV}} \approx 1.30 \times 10^{16}$ electrons\)

Kinetic energy = 3.125 × 10¹⁶ eV - 2.40 eV ≈ 3.125 × 10¹⁶ eV

\(Velocity = \sqrt{\frac{2 \times 3.125 \times 10^{16} \, \text{eV}}{9.11 \times 10^{-31} \, \text{kg}}} \approx 2.41 \times 10^6 \, \text{m/s}\)

Therefore, the maximum number of electrons emitted is approximately 1.30 × 10¹⁶, and their kinetic energy is approximately 3.125 × 10¹⁶ eV. The velocity of the emitted electrons is approximately 2.41 × 10⁶ m/s.

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Answer:

acid rain

Explanation:

When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation.

Answer:

See explanation

Explanation:

When a beaker of ethanoic acid is placed in the refrigerator, its temperature drops and the vessel feels cool.

Now, when we mix ethanoic acid and sodium carbonate, an endothermic reaction occurs, fizzing is observed as carbon dioxide is given off and heat is lost to the surroundings causing the reaction vessel to feel cool to touch.

The difference between putting ethanoic acid in the refrigerator and adding  sodium carbonate to the solution is that, in the former, no new substance is formed. The substance remains ethanoic acid when retrieved from the refrigerator. In the later case, new substances are formed. The substance is no more ethanoic acid because a chemical reaction has taken place.

An ionic salt, is more soluble in water

Polar substances  are generally more soluble in water compared to nonpolar substances. This is because water is a polar solvent, meaning that it has a partial positive charge on one end and a partial negative charge on the other end due to the asymmetric arrangement of its atoms.

Polar substances also have a partial positive and partial negative charge on different parts of their molecules, which allows them to interact with water molecules through electrostatic interactions,

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Explanation:

Equation balanced:

2 H₂O -> 2 H₂ + O2

So if 1.97 mol of O2 is produced, it was needed 3.94 moles of H2O.

Let's transform to grams using the molar mass of water:

18 g --- 1 mol

x g --- 3.97 mol

x = 70.92 g

Answer: 70.92 g

B

The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14

then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.

Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer

Answer: The ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.

Explanation:

Law of constant proportion states that In a chemical substance the elements are always present in definite proportions by mass. This law is also known as 'Law of definite proportions '.

Mass of 1 atom of sulphur = 32 g

Mass of 1 atom of oxygen = 16 g

Mass of 2 atoms of oxygen =\(16g\times 2=32g\)

In formation of \(SO_2\) , 1 atom of sulfur combines with 2 atoms of oxygen and thus the mass ratio will be 32: 32= 1:1 .

Thus the ratio of mass of sulfur atom to mass of oxygen atom in sulfur dioxide is 1: 1.

Since the proton is bonded to the carbon atom that is bonded to the highest number of other carbon atoms, the enol tautomer is an "e" isomer:

e-Acetone: H3C-C=O-CH3

|

H-O

To draw the "z" isomer, simply bond the proton to the carbon atom that is bonded to the lowest number of other carbon atoms:

z-Acetone: H3C-C=O-CH3

H

|

O-H

Enyol tautomers are structures of a compound that can interconvert through the movement of a proton. The two most common types of enol tautomers are the "e" and "z" isomers.

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Answer: A. They were traveling through different types of rocks

Explanation:

Answer:

Have a good day Ahead

:)))))))))((

Answer:

Electrical to mechanical

Explanation:

Unless of course the motor is gasoline or deisel.

1)  NaCl(aq) + AgNO3(aq) → double displacement

2) Fe + CuSO4 (aq) → FeSO4 (aq) + Cu (s) The type of reaction is a    displacement reaction.

3) C4H 10(g) +O2(g) → 4CO2(g) +5H 2O(g) - combustion reaction

4)Ba (NO3)2 + Na2SO4 → BaSO4 + 2NaNO3 -double replacement reaction

5) AgNO3 + Li = LiNO3 + Ag might be an ionic equation.- redox reaction

6) LiBr(aq) + Cu(s) = CuBr(s) + Li(s)- redox reaction (ionic equation)

B. Mg is the element contains 4.95×10234.95×1023 atoms.

To identify the element from the given information, we need to use the concept of molar mass and Avogadro's number. The molar mass of an element is the mass of one mole of its atoms, and Avogadro's number is the number of atoms in one mole of a substance.

First, we can calculate the number of moles of the element in the sample using the formula:

moles = number of atoms / Avogadro's number

Substituting the given values, we get:

moles = 4.95×10^23 / 6.022×10^23

moles = 0.821

Next, we can calculate the molar mass of the element using the formula:

molar mass = mass / moles

Substituting the given values, we get:

molar mass = 20.0 g / 0.821 mol

molar mass = 24.36 g/mol

Finally, we can use the periodic table to identify the element that has a molar mass of approximately 24.36 g/mol. Among the choices given, only magnesium (Mg) has a molar mass close to this value (24.31 g/mol).

Therefore, the element in the sample is magnesium (Mg).

In summary, the given information allows us to calculate the number of moles and molar mass of the element, which can be used to identify the element using the periodic table. This type of calculation is commonly used in analytical chemistry to determine the identity and composition of unknown samples. Therefore, Option B is correct.

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Answer:

H2SO4

Explanation:

Answer: The molarity of the diluted solution be 0.10 M

Explanation:

According to the dilution law,

\(C_1V_1=C_2V_2\)

where,

\(C_1\) = concentration of concentrated solution = 0.15 M

\(V_1\) = volume of concentrated solution = 100 ml

\(C_2\) = concentration of diluted solution= ?

\(V_2\) = volume of diluted solution= 150 ml

Putting the values we get:

\(0.15\times 100=M_2\times 150\)

\(M_2=0.10M\)

Thus the molarity of the diluted solution be 0.10 M

Answer:

C

Explanation:

I took this class it's C they are balanced

According to molar concentration, the molarity of calcium chloride solution is 0.858 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Substitution in the first formula, gives 429/110.98×1/4.5=0.858 M.

Thus, the molarity of solution is 0.858 M.

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