- Jim passes a 1.5 kg basketball
of 60 N. Find the acceleration
A. 40 m/s²
B. 40 m/s
C. 90 m/s²
D. 0.025 m/s²
to his teammate with a force
of the basketball.

If 170 milligrams of a radioactive substance decays to 85 g after 16 hours. Then, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

The decay of the radioactive substance follows an exponential decay equation of the form:

\(N(t) = N_{o} \times e^{-kt}\)

Where:

N(t) is the amount of substance remaining at time t

N₀ is the initial amount of substance

k is the decay constant

t is the time elapsed

Given to us is N₀ = 170 mg and N(16) = 85 mg. We can use this information to find the decay constant, k.

\(85 = 170 \times e^{-k \times 16}\)

Dividing both sides by 170:

\(0.5 = e^{-k \times 16}\)

To solve for k, we can take the natural logarithm (ln) of both sides:

ln(0.5) = -k × 16

from this, the value of k comes out to be:

k = 0.0431

Now we can use the decay equation to find the amount of substance remaining after 21 hours, N(21):

\(N(21) = 170 \times e^{-0.0431 \times 21}\)

Calculating this expression:

N(21) = 75.2

Therefore, after 21 hours, approximately 75.2 mg of the radioactive substance will remain.

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Replacing the air inside a metal organ pipe with helium gas would raise the pipe's pitch because helium gas has a lower molecular weight than air. This means that the speed of sound is faster in helium gas than in air. When a pipe is blown, the air molecules inside it vibrate and create sound waves.

The frequency of these sound waves determines the pitch of the note that is produced.

When helium gas is used instead of air, the sound waves travel faster through the lighter gas, resulting in a higher frequency and therefore a higher pitch. This is because the wavelength of the sound waves is shorter in helium gas than in air, so more waves can fit inside the pipe during a given period of time, resulting in a higher frequency.

Overall, replacing the air inside a metal organ pipe with helium gas is a way to alter the pitch of the note produced, making it higher due to the faster speed of sound in helium gas.

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Unsaturated monomers are added to create a polymer chain without any byproducts being eliminated to create additional polymers. Polyethylene and polypropylene are a couple of examples of additional polymers.

Step-growth polymers, in contrast, are created by reacting two or more monomers, frequently with functional groups, to create a polymer chain by getting rid of tiny molecules like water or alcohol. Polymers with a step-growth pattern include nylon and polyester. Thus, step-growth polymerization involves the interaction of monomers with the elimination of small molecules to form a polymer, whereas addition polymerization involves the addition of monomers to build a polymer without the generation of by-products.

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--The complete Question is, Briefly explain two differences between the preparation of Addition polymers and Step-growth polymers. --

Answer:

Shenzi

Banzai

Ed

Scar

Simba

Timon

Pumbaa

Explanation:

they don't make their own food but get it from other organisims

Your answer: (a) Yes, regardless of the sign of ΔH, if ΔS is positive, a reaction can be rendered favorable by increasing the temperature.

A property whose value doesn't depend on the path taken to reach that specific value is known to as state functions or point functions. In contrast, those functions which do depend on the path from two points are known as pathThe fundamental thermodynamic equations follow from five primary thermodynamic definitions and describe internal energy, enthalpy, Helmholtz energy, and Gibbs energy in terms of their natural variables.

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The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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Answer:

its true i just looked on quizlet

Explanation:

The molar mass of a substance is the mass of one mole of that substance, and it is usually measured in units of grams per mole (g/mol). In the case of helium gas (He2), the molar mass is calculated by adding up the masses of two atoms of helium.

Helium is a chemical element with the atomic number 2 and the symbol He. Its atomic weight is 4.003, which means that one atom of helium has a mass of 4.003 grams. To find the molar mass of helium gas, we need to multiply the atomic weight of helium by Avogadro's number, which is 6.022 x 10^23 atoms per mole.

Therefore, the molar mass of helium gas (He2) is:

(2 x 4.003 g/mol) = 8.006 g/mol

It is important to note that, helium is a diatomic molecule, meaning it exist in pairs (He2) and it is a gas at room temperature and standard pressure, so the molar mass of helium gas is 8.006 g/mol.

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0.41M is the concentration of the dilute solution. It requires you to calculate the concentration and it is safe to assume that the unit used is molarity (M). This unit was also used for the problem.

We have to work to achieve this because molarity is measured in moles/L. According to the number, you have 5.09 ml with a molarity of 12.0. concentration. First we will require moles. We use stoichiometry to get moles:

5.09 ml = 0.00509 L

0.00509 L x (12 mol/L) = 0.06108 mol

This is the number of moles present in the solution. To find the new concentration, we divide the total number of moles by the new volume in liters:

0.06108 mol/0.150 L = 0.4072 M

Rounding to two numbers gives 0.41 M.

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Answer:

Ionization energy decreases from top to bottom in groups as the size of the atom becomes larger. For example, the first ionization energy of hydrogen is 1310 kJ mol⁻¹. The first ionization energy of lithium is 519 kJ mol⁻¹. Because lithium is a bigger atom and has more protons than hydrogen, its ionization energy is lower. So, in groups, the lower the ionization energy, the larger the atom and the more protons/electrons it has.

Ionization energy also increases from left to right across a period. The more protons in the nucleus, the greater the attraction between the nucleus and the electrons, which makes it more difficult to remove electrons. Helium has an ionization energy of 2370 kJ mol⁻¹ while hydrogen has an ionization energy of 1310 kJ mol⁻¹ because helium's nucleus has 2 protons attracting electrons instead of 1 like hydrogen. So for periods, the higher the ionization energy, the smaller the atom and the more protons/electrons it has.

Ionization energy is the energy required to remove an electron from its orbital around an atom. It increases across a period because the number of protons in the nucleus increases. This creates a stronger attraction between the nucleus and electrons, causing the electrons to be held tighter by the higher nuclear charge. Because the electrons are more difficult to remove, more energy is required which causes the ionization energy to be higher. So for periods, the more electrons the atom has, the higher the ionization energy. Ionization energy decreases down a group because the first electron removed is farther from the nucleus as the number of protons increases. Being farther away from the nucleus makes it easier for the electron to be pulled off as it is more loosely bounded, so less energy is required to remove the electron which causes the ionization energy to be lower. So for groups, the more electrons the atom has, the lower the ionization energy.

Groups are vertical columns going down on the periodic table. If you look at a periodic table, across the top, you will see the numbers 1-18. Those numbers signify the 18 groups of the periodic table. Iodine is a halogen so it is under Group 17 to the far right of the periodic table.

I attached two periodic tables for reference to everything that I've said as I've written a lot. Hope that helps.

We need moles of Ca(OH)_2

Molar mass of Ca(OH)_2=74g/mol

Now

Option C

The mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.

Given: Volume = 1500 mL, Concentration (Molarity) = 0.0250 M, and Compound = Ca(OH)₂ .

First, convert mL to L: Volume = 1500 mL × (1 L / 1000 mL) = 1.5 L.

Use the formula for calculating the number of moles: Moles = Concentration × Volume.

Moles = 0.0250 mol/L × 1.5 L = 0.0375 mol.

The molar mass of Ca(OH)₂  can be calculated:

Ca(OH)₂  molar mass = (1 * atomic mass of Ca) + (2 * atomic mass of O) + (2 * atomic mass of H)

= (1 * 40.08 g/mol) + (2 * 16.00 g/mol) + (2 * 1.01 g/mol)

= 74.09 g/mol.

Now, calculate the mass using the calculated moles and molar mass:

Mass = Moles × Molar mass

Mass = 0.0375 mol × 74.09 g/mol = 2.78 g.

Therefore, the mass of Ca(OH)₂  in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.

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The complete question is:

What mass of Ca(OH)₂ is contained in 1500 mL of 0.0250 M Ca(OH)₂ solution?

A) 1.85 g

B) 2.34 g

C) 2.78 g

D) 3.17 g

An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

An atom X has 12 protons and 12 electrons that means X is a neutral atom and the atomic no. is 12 because total no. of protons is equal to atomic number. When it looses the 2 electrons then atom becomes positively charged ion . the charge on the ion is +2.

now, the no. of protons will be = 12

number of electrons will be = 12 - 2 = 10

Thus, An atom X that has 12 protons and 12 electrons, loses 2 electrons to form an ions,  the charge of ion will be X⁺² the number of protons 12 and electrons in the ions is 10.

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The answer is Copper (Cu2+).Copper (Cu2+) ion is most easily reduced to the metal.

Reduction potential series (or activity series) lists metals in order of their "readiness" to lose electrons (their "activity"). Metals that have a higher reduction potential than hydrogen can react with non-metal ions from the solution, causing the metal to precipitate out of the solution as a solid.

As a result, metals at the top of the series are more reactive than those at the bottom. In this case, the most easily reduced element is the one that is closest to the top of the list, as it is the most reactive. Copper is the most easily reduced element, according to the given series, since it is closest to the top of the list, with a reduction potential of 0.34 V. When Cu2+ ions are added to a solution containing iron or zinc, they will precipitate out, causing the metals to appear as solid pieces.

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Answer:

las plantas

Explanation:

Las plantas son los seres vivos capaces de transformar energía luminosa utilizando agua y dióxido de carbono (CO₂) en energía química en forma de moléculas llamadas carbohidratos. El proceso a través del cual realizan esto se denomina fotosíntesis, y para ello requieren un pigmento de color verde denominado clorofila, el cual es necesario para captar la energía luminosa proveniente del Sol.

The temperature of 2.0 L of water is 42 °C removing thermal energy from the water cause the temperature of the water to increase to 50 °C.

Thermal energy is defined as the internal energy of a system that controls its temperature. Thermal energy is a type of kinetic energy, which is energy brought on by motion, and is brought on by the motion of particles. Solar power plants generate energy through the use of thermal energy.

Q = c × m × Δ T

ΔT = The system's temperature has changed.

The three different processes that lead to heat transmission are described here. When substances are heated, their volume rises, and when they are cooled, it falls.

Thus, the temperature of 2.0 L of water is 42 °C removing thermal energy from the water cause the temperature of the water to increase to 50 °C.

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the molarity of "acidity" in the vinegar is 0.00386 .

What is molarity ?

Molarity (also called molarity, bulk concentration, or substance concentration) is a measure of the concentration of a chemical species, especially a solute, in solution, expressed as the amount of substance per unit volume of solution. In chemistry, the most commonly used unit of molarity is moles per liter, symbolized in SI units as mol/L or mol/dm3. A solution with a concentration of 1 mol/L is called 1 molar, commonly called 1 M.

Molarity or molarity is most commonly expressed in moles of solute per liter of solution. For broader use, it is defined as the amount of solute material per unit volume of solution, or per unit volume available to a species, and is expressed in lower case.

this %mass means:

basis --> 100 g of solution, then 5 g are vinegar

assume d = 1 g/ml then we have V = 100 ml of solution

m = 5 g of Acetic acid

MW of acteic Acid = 60

mole = mass/MW = 5/60 = 0.08333 mol of acetic acid

By definition

M = mol/V = 0.0833/0.1 = 0.8333 M of Acetic acid

Ka = 1.8*10^-5

Ka = [H+][A-]/[HA]

1.8*10^-5 = (x)(x) / (0.8333-x)

x = [h+]

solve for H+

[h+] = 0.00386

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For the molecules Cl Br Cl the ratio of the M to M+6 peaks is option D- 12:5:1.

The ratio of M to M+6 peaks in a mass spectrum of a molecule depends on the number of carbon and hydrogen atoms present in the molecule. The presence of carbon-13 isotopes in the molecule leads to a smaller M+6 peak relative to the M peak.

M = (2 × atomic mass of C) + (2 × atomic mass of Br) + (2 × atomic mass of I)

= (2 × 12.01) + (2 × 79.9) + (2 × 126.9)

= 345.6

The M+6 peak corresponds to the molecular weight of the molecule with one carbon-13 isotope, which is:

M+6 = (2 × atomic mass of C) + (2 × atomic mass of Br) + (2 × atomic mass of I) + (atomic mass of carbon-13)

= (2 × 12.01) + (2 × 79.9) + (2 × 126.9) + 13.003

= 358.6

The ratio of M to M+6 peaks can be calculated by dividing the intensity of the M peak by the intensity of the M+6 peak.

M:M+6 = (345.6 / 358.6) / 0.011 = 12.5:1

Therefore, the answer is 12.5:1.

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Answer:

ionic, they would make an ion

Explanation:

Answer:

Lungworms live in the lungs of bighorn sheep causing them to be sick, or even die.

Explanation:

hope this helps

pls mark me brainliest

To calculate the amount of calcium hypochlorite needed, we need to consider the volume of water in the pipeline and the desired concentration of chlorine.

First, we need to convert the pipeline length from feet to gallons since the concentration is given in milligrams per liter (mg/L). Assuming the pipeline has a uniform cross-sectional area, we can use the formula: volume = area × length.

The cross-sectional area of a 24-inch pipeline can be calculated using the formula: area = π × (radius)^2. Since the radius is half of the diameter, the radius of a 24-inch pipeline is 12 inches.

Converting inches to feet, the radius is 1 foot. So the cross-sectional area of the pipeline is π × (1 ft)^2 = π square feet.

Next, we multiply the cross-sectional area by the length of the pipeline to get the volume in gallons. Since 1 gallon is equal to 3.78541 liters, we can convert the volume to liters.

Now, we have the volume of water in liters. To find the amount of calcium hypochlorite needed, we multiply the volume by the desired concentration of 50 mg/L.

Finally, since the calcium hypochlorite contains 65% chlorine, we need to consider the chlorine content when calculating the amount of chemical required. We divide the desired concentration by the chlorine content (65%) and convert the result to pounds.

The calculated amount will be the pounds of calcium hypochlorite needed to achieve the desired chlorine concentration in the pipeline.

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Molar mass is the mass of one mole of a substance. Therefore, the molar mass of trans-9-(2-phenylmethyl)anthracene is 356.44 g/mol.

The substance in question is trans-9-(2-phenylethenyl)anthracene. This organic compound can be represented as C28H20. The molar mass of trans-9-(2-phenylethenyl)anthracene is therefore calculated as follows:Step 1Determine the molar mass of carbon (C) and hydrogen (H). The atomic mass of carbon is 12.01 g/mol, and the atomic mass of hydrogen is 1.008 g/mol. Step 2Calculate the total molar mass of carbon and hydrogen in the compound. Multiply the atomic mass of carbon by the number of carbon atoms in the compound (28), and multiply the atomic mass of hydrogen by the number of hydrogen atoms in the compound (20).Step 3Add the molar masses of carbon and hydrogen to get the total molar mass of the compound. 12.01 × 28 + 1.008 × 20 = 336.28 + 20.16 = 356.44 g/molTherefore, the molar mass of trans-9-(2-phenylethenyl)anthracene is 356.44 g/mol.

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Answer:

118 elements in the periotic table

Explanation:

:)

Answer:

soluteswws

Explanation:

Answer:

He numbered these orbits due to their location.

Explanation:

Scientist Neil Bohr in his atomic model describes that electrons are moving with high velocity in circular paths around the nucleus is called shells or orbits. As long as electrons are in their particular orbit their energy is constant. He named those orbits as K- shell, L- shell and M- shell etc. When the electron absorb energy, it is able to jump to the next shell and comes back to its original shell when it loses energy. He also give numbers i.e. 1,2,3,4 to the shells due to their nearness to the nucleus. Shell 1 is near to the nucleus whereas shell 4 is farther from the nucleus.

The equilibrium constant at a temperature of 25°C is Kp = 28.18. This value can be expressed to three significant digits as Kp = 28.2.

A state of balance between conflicting forces or influences is known as equilibrium. It is a principle that is applied in a variety of fields, including as physics, chemistry, and economics.

The following equation can be used to determine the equilibrium constant for the specified reaction:

Kp = [Cl₂]²[H₂O]² / [HCl]⁴[O₂]

The partial pressures of the gases can be used to determine Kp on the assumption that the gas is ideal.

Kp = (PCl₂)²(PH₂O)²/ (PHCl)⁴(PO₂)

Kp is easily calculable if the partial pressures of each gas are known. Finding the equilibrium constants at a given temperature is important because no pressures are provided in this scenario.

According to the information in the thermochemical table, Kp = 28.18 is the equilibrium constant at 25°C. 3 significant figures can be used to express this amount Kp = 28.2.

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Answer:

266 liters Carbon iv oxide will be formed

Explanation:

The first thing we need to do here is to calculate the number of moles of oxygen reacted.

This can be calculated using the ideal gas equation;

Mathematically;

PV = nRT

From the question;

P = pressure = 10.5 atm

V = volume = 400 liters

n = number of moles = ?

T = temperature = 125 + 273 = 398K

R = molar gas constant = 0.0821 L•atm•K^-1•mol^-1

Substituting these values, we have ;

n = PV/RT

n = (10.25 * 400)/(398 * 0.0821) = 125 moles

From the question;

15 moles oxygen gave 10 moles CO2

125 moles oxygen will give x moles CO2

x = (125 * 10)/15 = 83 moles

Now, we want to know the volume of CO2, present in 83 moles using the given reaction conditions.

Mathematically;

PV = nRT

V = nRT/P

= (83 * 0.0821 * 398)/10.25 = 265.65 which is approximately 266 Liters

Answer: Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. Let the TA inspect his wrist to see if it is okay.

Explanation:

The question is incomplete, the choices are:

a. Take him to the safety shower, and make sure he stands under it for at least 15 minutes to be sure all hazardous material has been washed away. b. Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. c. Let the TA inspect his wrist to see if it is okay.

d. Rinse the watch band before allowing him to put it back on.

An acid is traditionally considered to be any chemical compound that, when dissolved in water, produces a solution with greater hydronium cation activity than pure water, i.e., a pH less than 7. Both corrosive acids (and also corrosive bases) are capable of destroying skin by catalyzing the hydrolysis of fats, which are chemically esters. Also, when acids attack metals, hydrogen gas is often released.

This is why your lab partner should remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. This ensures that the acid is can not damage the skin. And also the person should make sure that someone qualified checks it to see if it is okay.

An acidophile is a microorganism that thrives in an acidic environment, typically having an optimum pH range of 0-5.5. Therefore, an acidophile would grow best in a low pH-adjusted medium, preferably around pH 3-5.5.

An acidophile is an organism that thrives in an acidic environment. Therefore, it would grow best in a ph-adjusted medium that is acidic.

The optimal pH range for an acidophile varies between species, but it is generally below pH 5.5. In order to support the growth of acidophilic organisms, the pH of the medium must be adjusted accordingly, and it can be done by adding a strong acid such as hydrochloric acid or sulfuric acid to lower the pH.

Alternatively, acidic substances such as citric acid or acetic acid can be used to adjust the pH downward. It is important to note that the pH of the medium should not be lowered below the range in which the acidophile grows best, as this could lead to cell death. Therefore, it is essential to determine the optimal pH range for the acidophile in question before preparing the growth medium.

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