the kind of friction that shows a falling object is it gravity, free fall

Answer: A

Explanation: A

57.49 g of HCl reacting with 98.20 g of \(AgNO_3\) will produce 62.3 g of AgCl precipitate.

To determine the grams of AgCl (s) precipitate produced, we first need to write and balance the chemical equation for the reaction between hydrochloric acid (HCl) and silver nitrate (\(AgNO_3\)) that produces silver chloride (AgCl) precipitate:

HCl (aq) + \(AgNO_3\)  (aq) → AgCl (s) + \(HNO_3\) (aq)

From the balanced equation, we can see that one mole of \(AgNO_3\) reacts with one mole of HCl to produce one mole of AgCl.

To determine the limiting reactant in the reaction, we need to calculate the number of moles of each reactant:

moles of HCl = 57.49 g / 36.46 g/mol = 1.577 mol

moles of \(AgNO_3\) = 98.20 g / 169.87 g/mol = 0.578 mol

Since \(AgNO_3\) has fewer moles than HCl, it is the limiting reactant. This means that all of the \(AgNO_3\) will be consumed in the reaction, and any excess HCl will be left over.

The number of moles of AgCl produced can be calculated from the number of moles of \(AgNO_3\) :

moles of AgCl = moles of \(AgNO_3\) = 0.578 mol

The mass of AgCl produced can be calculated using the molar mass of AgCl:

mass of AgCl = moles of AgCl x molar mass of AgCl

mass of AgCl = 0.578 mol x (107.87 g/mol) = 62.3 g

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The amount of heat released in kJ when 75 grams of phosphorus react with excess chlorine is 858.848 kJ.

Moles of P = mass of P / molar mass of P = 75 g / 30.97 g/mol = 2.42 moles

From the balanced chemical equation, 2 moles of P react with 5 moles of Cl2 to form 2 moles of PCl5.

Moles of PCl5 = (2.42 moles P / 2 moles PCl5) x (2 moles PCl5 / 5 moles Cl2) = 0.968 moles

Heat released = moles of PCl5 x AH° = 0.968 moles x (-886 kJ/mol) = 858.848 kJ

In other words, the amount of heat released in kJ when 75 grams of phosphorus react with excess chlorine is approximately 858.848 kJ.

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Answer:

Chemical properties because if it was physical property then it will glow in dark

The rate constant of the first-order half-life reaction is 0.023 / sec or ln(2)/30 sec.

The formula for a first-order half-life reaction is t = (1/k) [ ln (initial concentration/final concentration)].

For determining the rate constant k, we can easily substitute the given t=30.0s to the formula. As for the initial and final concentration, we will be using 1/2 of the initial concentration as the final concentration. With this, the ratio of initial and final concentration would be equal to 1/(1/2) or 2. The exact value of the concentration is not important for this problem.

t= (1/k) * ln(2)

30.0 seconds = (1/k) * ln(2)

k = (ln (2)) / 30 seconds

k = ln (2) / 30 or 0.023/sec

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If a person's breathing passage were filled with helium instead of air, the frequency of their voice would increase.

The frequency of a person's voice is determined by the vibration of their vocal cords. When air passes through the vocal cords, they vibrate at a certain frequency, which produces sound. The speed of sound waves traveling through a medium depends on the properties of that medium. Helium is a gas that is less dense than air, and sound travels faster through helium compared to air. As a result, if a person breathes in helium, the increased speed of sound waves in their vocal tract would cause the vocal cords to vibrate at a higher frequency, resulting in a higher-pitched voice. This is the reason why inhaling helium is known to produce a temporary change in voice pitch, often described as a high-pitched or squeaky voice

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The mass of unknown radioactive substance will be 69 gram.

When a substance will have unstable nuclei and even the capacity to spontaneously release energy while exchanging fast-moving charged particles in an effort to stabilize, the substance is described as radioactive.

It is known that

\(N/N_{0} = (1/2)^{t/x}\)

where, N = initial quantity, \(N_{0}\)  = quantity remaining, t = elapsed time.

Given that,

N = 38.5 g

t = 3.20 hours

x = 8 hour

\(N_{0}\) = ?

Put the value of given data in above equation.

\(N/N_{0} = (1/2)^{t/x}\)

38.5/ \(N_{0}\)  = 80/32

\(N_{0}\)  = 69 gram.

Therefore, the mass of unknown radioactive substance will be 69 gram.

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Answer:

26.981539

Explanation:

To increase the acceleration of the dog sled, increase the applied force on the sled and reduce the mass on the sled.

According to Newton's second law of motion, the force applied to an object is directly proportional to product of mass and acceleration of the object.

F = ma

where;

a is the acceleration of the dog sled

\(a = \frac{F}{m} \\\\\)

To increase the acceleration of the dog sled:

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The mass of oxygen gas produced, given that 15.8 g of potassium permanganate is heated until no more oxygen gas is given off is 1.6 g

From the question given, the following data were obtained:

The mass of oxygen gas produced from the reaction can be obtained as follow:

Mass of potassium permanganate = Mass of remaining substance + mass of oxygen

Inputting the given parameters, we have:

15.8 = 14.2 + mass of oxygen

Collect like terms,

Mass of oxygen = 15.8 - 14.2

= 1.6 g

Thus, we can conclude that the mass of oxygen gas produced from the reaction is 1.6 g

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Answer:

I think it's C. Animals add water vapor to the air through respiration

Explanation:

A molecule which has one or more polar covalent bonds may have a dipole moment as a result of the accumulated bond dipoles

A dipole moment is present in symmetric molecules. the circumstance in which a molecule's net dipole moment is zero.

For instance, CO2 has no dipole moment since oxygen is linearly positioned on both sides of carbon in the middle of the gas's shape.

Since their dipole moments are equal and opposing, they have a net zero dipole moment.

The bond moment, also known as the dipole moment, is used to determine a bond's polarity.

Debye units are used to express the dipole moment (D). When opposed charges of 1 10 form a bond, it produces a dipole moment of 1 D.

The dipole moment provides information regarding the degree of charge separation in a bond.

(CO2) carbon dioxide

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Answer: B

Explanation:

Answer:

d

Explanation:

i think

Dishwashing liquid (detergent) is useful for removing grease from pans due to its amphipathic character.

Grease is a type of liquid lubricant that has thickening agents dispersed throughout it. It can also be solid or semisolid. A soap is typically emulsified with mineral or vegetable oil to form grease.

One typical characteristic of greases is that they have a high initial viscosity, which, when sheared, decreases to create the impression of an oil-lubricated bearing with a viscosity that is roughly equal to the base oil used in the grease. Shear thinning refers to this change in viscosity. Sometimes the term "grease" is used to refer to lubricating substances that are merely soft solids or highly viscous liquids; however, these substances lack the shear-thinning characteristics of traditional grease. For instance, petroleum jellies like Vaseline aren't typically categorized as greases.

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For this question, we are going to use two formulas to find the energy, the first one is already described in the question itself, which is:

E = h*f

Where:

E = energy

h = planck's constant, 6.63*10^-34

f = frequency, which we have to find

And the next formula will be:

f = c/λ

Where:

f = frequency

c = speed of light, 3.00*10^8 m/s

λ = wavelenght, 510 nm

Now let's solve the frequency formula first:

f = 3.00*10^8/510*10^-9

f = 5.88*10^14

Now we use this value of frequency to find the energy

E = 6.63*10^-34 * 5.88*10^14

E = 3.9*10^-19 J

10.0g of CaBr2 contains 0.05 mol according to the equation mole(n) = mass / molar mass (10.0g CaBr2 x 1 mol CaBr2 / 199.88 g CaBr2 = 0.05 mol)

The mole, represented by the symbol mol, is the SI unit of material quantity. One mole is made up of precisely 6.022*1023 elementary components. The Avogadro number, NA, as expressed in mol1, is the fixed numerical expression of the Avogadro number.

The weight in grams of 1 mole of a certain substance is its molar mass. The atomic mass of the chemical unit, expressed in atomic mass units, determines the mass of a substance (amu).

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Answer:

[Ne] 3s² 3p³

Explanation:

this is the answer and give me likes and vote for me

a. The breakdown voltage of air is a function of pressure and air gap spacing.

b. The minimum breakdown voltage occurs when the applied voltage reaches a critical value, which depends on the pressure and air gap spacing.

c. The minimum breakdown voltage occurs at atmospheric pressure (1 atm).

d. The minimum breakdown voltage occurs when the air gap spacing is 1 mm.

e. Gaseous insulation is preferred over liquid or solid insulation because it is more reliable, has higher dielectric strength, and is less likely to become contaminated or corroded. Additionally, gaseous insulation can be used in a wider range of operating temperatures.

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Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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Answer:

He has two protons

Li electron has one electron in its outermost orbital.

Number of neutrons of nitrogen = seven neutrons

The second shell of boron: 3 electrons.

Explanation:

An atom is composed of electrons, protons and neutrons. The number of neutrons is determined by subtraction of the atomic number from the mass number.

The electronic configuration is already known for each of atoms in these questions according to standard tables.

Answer:

1.) Make a He atom with a mass of 4. How many protons did you put in the nucleus?

2

2.) Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?

1

3.) Make a N atom with a mass number of 14. How many neutrons are in the nucleus?

7

4.) Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?

3

Explanation:

Did it on Edgenuity and got it correct (2020).

The rate at which the volume is changing, represented as dV/dt, is given by the equation (0.4155 - 0.32V(t)) / 16, where V(t) is the volume, and the values are substituted accordingly.

To find the rate at which the volume is changing, we need to differentiate the given equation with respect to time (t) using the chain rule:

PV = 8.31T

Differentiating both sides with respect to time:

P(dV/dt) + V(dP/dt) = 8.31(dT/dt)

We are given:

dT/dt = 0.05 K/s (rate of temperature change)

(dP/dt) = 0.02 kPa/s (rate of pressure change)

P = 16 kPa (initial pressure)

T = 295 K (initial temperature)

Substituting the given values into the equation, we have:

16(dV/dt) + 16V(0.02) = 8.31(0.05)

Simplifying the equation:

16(dV/dt) + 0.32V = 0.4155

Rearranging the equation to solve for dV/dt:

16(dV/dt) = 0.4155 - 0.32V

(dV/dt) = (0.4155 - 0.32V) / 16

To find the rate at which the volume is changing when T = 295 K, we substitute V = V(t) and T = 295 into the equation:

(dV/dt) = (0.4155 - 0.32V(t)) / 16

Calculating the value of (dV/dt) at the given temperature and rounding to at least 4 decimal places will provide the final answer.

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forward direction will the equilibrium shift .

2no₂(g) ⇌ n₂o₄(g)

∆h° for this reaction is < 0. if the volume of the container is decreased by ½ while the temperature is kept constant.

then,

k equivalent is inversely proportional to volume.

k eq ∝ 1/v in this reaction  (from coefficient of reactants and products)

if the volume of the container is decreased by ½ .

then, k eq increase 2 times.

k equivalent is greater than 1

this shows that equillibrium shift will take place in forward direction.

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Answer:

C

Explanation:

When two atoms share electrons, a covalent bond is formed. The more electrons shared between atoms, the stronger the bond. Single bonds have two electrons shared, double bonds have four electrons shared, and triple bonds have six electrons shared.

Therefore, triple bonds are the strongest as they require more energy to break.

Hope that helps.

Answer:

mutualism describes the ecological interaction between two or more species where species has a net benefit. 2. The doctrine that mutual dependence is necessary to social well-being

Explanation:

google

The gases with highest average kinetic energy per mole at 298 are oxygen, carbon oxide, hydrogen. That is all have same kinetic energy. So, correct answer is option (d).

As motion of gas particles is fast then there is relatively large amount of kinetic energy. The average kinetic energy per mole of a gas is equal to 3/2 RT where T is the absolute temperature. The molar kinetic energy of a gas is proportional to its temperature, and the proportionality constant is 3/2 times the gas constant R.

When the temperature is same, the average kinetic energy per mole will be same for hydrogen, oxygen and carbon dioxide as the average kinetic energy per mole is independent of its molar mass. Thus, at constant temperature 298 k all the gases have same kinetic energy.

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Complete question :

select the gas with the highest average kinetic energy per mole at 298 k..

a) O2

b. CO2

c. H2

d) all have the same kinetic energy

H+ appear on left hand side and the coefficient is 16 in the balanced redox reaction under acidic aqueous conditions.

What is redox reaction?

Redox reactions, also referred to as oxidation-reduction processes, are reactions in which electrons are transferred from one species to another. An oxidized species is one that has lost electrons, whereas a reduced species has gained electrons.

The balanced redox reaction under acidic aqueous conditions using the smallest whole-number coefficients is written as

\(2MnO+16H^{+} +10I^{-}\) →  \(2Mn2^{+} + 8H_{2} O + 5I^{2}\)

Therefore, the H+ is present on left side with a coefficient of 16 in the balanced redox reaction under acidic aqueous conditions.

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Answer:

atomic number

Explanation:

 The mass number of the atom (M) is equal to the sum of the number of protons and neutrons

Answer: Based on the stoichiometry 1 mole of carbon disulfide will produce 1 mole of carbon dioxide. Similarly we can apply the volume ratio, so 1.1L of carbon disulfide will produce 1.1L of carbon dioxide.