Why doesn’t a feather fall at the same rate as an apple?

Answer:

Cause and effect, easy.

Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

Answer:

2.104 L fuel

Explanation:

Given that:

Volume of water = 35 L = 35 × 10³ mL

initial temperature of water = 25.0 ° C

The amount of heat needed to boil water at this temperature can be calculated by using the formula:

\(q_{boiling} = mc \Delta T\)

where

specific heat   of water c= 4.18 J/g° C

\(q_{boiling} = 35 \times 10^{3} \times \dfrac{1.00 \ g}{1 \ mL} \times 4.18 \ J/g^0 C \times (100 - 25)^0 C\)

\(q_{boiling} = 10.9725 \times 10^6 \ J\)

Also; Assume that the fuel has an average formula of C7 H16 and 15% of the heat generated from combustion goes to heat the water;

thus the heat of combustion can be determined via the expression

\(q_{combustion} =- \dfrac{q_{boiling}}{0.15}\)

\(q_{combustion} =- \dfrac{10.9725 \times 10^6 J}{0.15}\)

\(q_{combustion} = -7.315 \times 10^{7} \ J\)

\(q_{combustion} = -7.315 \times 10^{4} \ kJ\)

For heptane; the equation for its combustion reaction can be written as:

\(C_7H_{16} + 11O_{2(g)} -----> 7CO_{2(g)}+ 8H_2O_{(g)}\)

The standard enthalpies of the  products and the reactants are:

\(\Delta H _f \ CO_{2(g)} = -393.5 kJ/mol\)

\(\Delta H _f \ H_2O_{(g)} = -242 kJ/mol\)

\(\Delta H _f \ C_7H_{16 }_{(g)} = -224.4 kJ/mol\)

\(\Delta H _f \ O_{2{(g)}} = 0 kJ/mol\)

Therefore; the standard enthalpy for this combustion reaction is:

\(\Delta H ^0= \sum n_p\Delta H^0_{f(products)}- \sum n_r\Delta H^0_{f(reactants)}\)

\(\Delta H^0 =( 7 \ mol ( -393.5 \ kJ/mol) + 8 \ mol (-242 \ kJ/mol) -1 \ mol( -224.4 \ kJ/mol) - 11 \ mol (0 \ kJ/mol))\)

\(\Delta H^0 = (-2754.5 \ \ kJ - 1936 \ \ kJ+224.4 \ \ kJ+0 \ \ kJ)\)

\(\Delta H^0 = -4466.1 \ kJ\)

This simply implies that the amount of heat released from 1 mol of C7H16 = 4466.1 kJ

However the number of moles of fuel required to burn \(7.315 \times 10^{4} \ kJ\) heat released is:

\(n_{fuel} = \dfrac{q}{\Delta \ H^0}\)

\(n_{fuel} = \dfrac{-7.315 \times 10^{4} \ kJ}{-4466.1 \ kJ}\)

\(n_{fuel} = 16.38 \ mol \ of \ C_7 H_{16\)

Since number of moles = mass/molar mass

The  mass of the fuel is:

\(m_{fuel } = 16.38 mol \times 100.198 \ g/mol}\)

\(m_{fuel } = 1.641 \times 10^{3} \ g\)

Given that the density of the fuel is = 0.78 g/mL

and we know that :

density = mass/volume

therefore making volume the subject of the formula in order to determine the volume of the fuel ; we have

volume of the fuel = mass of the fuel / density of the fuel

volume of the fuel = \(\dfrac{1.641 \times 10^3 \ g }{0.78 g/mL} \times \dfrac{L}{10^3 \ mL}\)

volume of the fuel  = 2.104 L fuel

Answer:

The increase in mass is not due to the heating but due to the reaction of the metal with oxygen in air to form an oxide

Explanation:

When a metal is heated in the presence of air, oxygen present in air reacts with the metal to form the oxide of the metal. The mass of this oxide is greater than the original metal by the amount of oxygen added to the metal during the reaction.

The above reaction is known as an oxidation reaction. Generally,

metal M + O2 ---> MO2

Answer:

When light waves strike a medium and are neither reflected or refracted, nor are they allowed to pass through.

Explanation:

Answer:

A.

Explanation:

Answer:

Actually both of ya are incorrect, it would be D. 36.5 mL, on study island it says that.

Explanation:

Answer: B

Explanation:

Answer: The destruction of crust occurs at deep-sea trenches. Oceanic rocks are pillow-shaped when formed. Rocks across the ocean floor have alternating magnetic stripes. Younger rocks are closer to mid-ocean ridges.

In ring-opening metathesis polymerization (ROMP), various catalyst systems can be employed to initiate the polymerization reaction. One common catalyst used in ROMP is Grubbs' catalyst, which is based on a transition metal such as ruthenium. The general structure of Grubbs' catalyst is as follows:

[Ru] = CHCH2

This structure represents the metal center (Ru) coordinated to a carbene ligand, which is crucial for the catalytic activity in ROMP.

In addition to the catalyst, cocatalysts and activators/promoters are often used to enhance the reactivity and efficiency of the polymerization process. Common cocatalysts include alkyl aluminum compounds, such as aluminum alkyls, which assist in activating the catalyst and improving its stability during the reaction.

The choice of activator/promoter can vary depending on the specific reaction conditions and desired polymer properties. Common examples of activators/promoters used in ROMP include Lewis acids such as boron trifluoride (BF3) or other boron-based compounds.

It's important to note that specific variations and modifications of catalysts, cocatalysts, and activators/promoters can be employed in ROMP reactions, and the structures may vary depending on the specific requirements of the polymerization process.

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The response that contains all the true statements about buffer solutions and no false statements is:

I. A buffer solution could consist of equal concentrations of ammonia and ammonium bromide.

III. A buffer solution will change only slightly in pH upon addition of acid or base.

IV. In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added [OH-] is the benzoate ion.

Statement II is false because perchloric acid, HClO4, is a strong acid and sodium perchlorate is a strong base. A buffer solution requires a weak acid and its conjugate base or a weak base and its conjugate acid to resist changes in pH upon the addition of acid or base. Perchloric acid and sodium perchlorate do not fulfill this requirement. Therefore, the correct response is I, III, and IV.

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In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added hydroxide ions is the benzoate ion. All the statements are TRUE, and there are NO false statements.

A buffer solution is a solution that is resistant to pH change upon the addition of an acidic or basic compound. This is due to the presence of both a weak acid and its conjugate base, or a weak base and its conjugate acid, in the solution. A buffer solution could consist of equal concentrations of ammonia and ammonium bromide. In a buffer solution, the pH remains relatively constant when small amounts of a strong acid or base are added to it. The benzoate ion is the species that reacts with added hydroxide ions in a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO.In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, NaC6H5COO, the species that reacts with added hydroxide ions is the benzoate ion. All the statements are TRUE, and there are NO false statements.

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Answer:

ΔH = 283kJ/mol

Explanation:

Using Hess's law, the ΔH of a reaction is equal to the sum of ΔH° of products times its coefficient subtracting the sum of ΔH° of reactants times its coefficient. Replacing, for the reaction:

ΔH = 2ΔH°C + 2ΔH°D - (2ΔH°A+ΔH°B)

ΔH = 2*193kJ/mol + 2*-493kJ/mol - (2*-235kJ/mol+ (-413kJ/mol)

The age of the rock is approximately 4.92 billion years.

The age of the rock can be determined using the ratio of 206Pb to 238U atoms, assuming that all the 206Pb atoms are the descendants of 238U, and using the known half-life of 238U.

The half-life of 238U is approximately 4.47 billion years, which means that after 4.47 billion years, half of the original 238U atoms in the sample would have decayed into 206Pb atoms.

To calculate the age of the rock, we can use the following formula:

age of rock = (ln 2 / λ) × (206Pb/238U + 1)

where: ln 2 is the natural logarithm of 2 (which is approximately 0.693)

lambda is the decay constant for 238U (which is ln 2 / half-life of 238U, or approximately 1.55125 x 10⁻¹⁰ per year)

206Pb/238U is the ratio of 206Pb to 238U atoms in the sample

Substituting the given values, we get:

age of rock = (0.693 / (1.55125 x 10⁻¹⁰)) × (0.12 + 1)

age of rock = 4.92 billion years (rounded to two decimal places)

Therefore, the age of the rock is approximately 4.92 billion years, assuming that all the 206Pb atoms are the descendants of 238U.

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Four hydrogen nuclei are converted into helium nuclei by the proton-proton chain. Because it is required for the process, this is not something that happens naturally on Earth. extreme temperatures, densities, and pressures.

Four hydrogen atoms come together to create one helium atom in the proton-proton chain of reactions. The energy is produced by the four hydrogen nuclei, which have lighter masses than the lone helium nucleus. When hydrogen and helium combine, energy is released, which causes mass to be converted to energy. Energy is released as mass is created along the proton-proton chain. But for the Big Bang Nucleosynthesis—the nuclear fusion reactions that took place in the early Universe—this is practically the end of the tale. The proton-proton chain, also referred to as the p-p chain, is one of two known sets of nuclear fusion events that stars use to generate helium. The other recognized reaction, the CNO cycle, is expected to predominate in stars with masses more than around 1.3 times that of the Sun, according to theoretical models. It predominates in stars with masses that are comparable to or less than that of the Sun. In general, the protons' kinetic energy, or temperature, must be high enough to outweigh their electrostatic attraction to one another for proton-proton fusion to occur.

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A) Animals break down food molecules to obtain energy. B) The remains of producers are broken down by decomposers. and C) The remains of consumers are broken down by soil decomposers.

Decomposers are organisms that break down dead or decaying organisms, and in doing so, they carry out the natural process of decomposition. Decomposers are a vital part of the food chain and the nutrient cycle. They are usually fungi and bacteria, but may also include other organisms, such as protists and certain animals, like worms and certain insects. Decomposers play an important role in the cycle of matter and energy in an ecosystem. They break down dead and decaying organisms, as well as feces, and in doing so, they release important nutrients back into the soil, which can then be used by other organisms. Decomposers are essential for the health of an ecosystem, as they help to maintain the balance of organisms and resources in an environment.

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Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.

For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.

The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:

Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6

The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:

Ka1 × Kb1 = Kw

where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.

Kb1 can be calculated as follows:

Kw = Ka1 × Kb1

Kb1 = Kw / Ka1

Kw = 1.0 × 10^-14

Ka1 = 6.2 × 10^-5

Kb1 = Kw / Ka1

Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5

Kb1 = 1.61 × 10^-10

Kb2 can be calculated using the same method:

Kw = Ka2 × Kb2

Kb2 = Kw / Ka2

Kw = 1.0 × 10^-14

Ka2 = 2.3 × 10^-6

Kb2 = Kw / Ka2

Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6

Kb2 = 4.35 × 10^-9

Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.

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The pH of a solution that is 0. 322 m in nitrous acid when acid dissociation constant of nitrous acid is 4 is given by 3.089, option C.

pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14.

The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.

The concentration of nitrous acid is 0.322 M

The concentration of potassium nitrite is 0.178 M

The acid dissociation constant of nitrous acid is, ka = 4.50 x 10⁻⁴

The Henderson-Hasselbalch equation for an acidic buffer is shown below:

pH = pKa + log\(\frac{[salt]}{[Acis]}\)

pKa = - logKa

pKa = - log(4.50 x 10⁻⁴)

= 3.35

Substitute values in the equation as,

pH = 3.35 + log(0.178/0.322)

= 3.35 + log(0.6077)

= 3.35 + (-0.216)

= 3.09.

Therefore, the pH is given by 3.09.

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Awnser

B. Metallic bonds

Explanation:

Castle Learning

Answer:

B) metallic bonds

Explanation:

Castle learning

Answer:

iron .. titanium.. nickel....aluminum... sulfur... and calcium

Answer:

It will double

Explanation:

Given;

From the ideal gas equation;

PV = nRT

P=nRT/V

where;

P = pressure of the gas

n= number of moles of the gas

V= volume of the gas

R = the gas constant

T= absolute temperature of the gas

If V is halved when n and T remain the same

P2 = nRT/V/2

P2 = nRT * 2/V

P2 = 2nRT/V

Hence the pressure is doubled.

Answer:

A) It will double

Explanation:

...

Answer:

B.

Explanation: Because it's at the bottom of the layer so it gets least sun and solar energy.

Explanation:

2Al(OH)3 + 3H2SO4 --> Al2 (SO4)3 + 6H2O

Answer:

c elevation

Explanation:

C is the answer for your question

Answer:

Weather is : the state of the air and atmosphere at a particular time and place : the temperature and other outside conditions (such as rain, cloudiness, etc.) at a particular time and place. And how to fold clothes:

Fold in one side of the shirt towards the centre, about a third.

Fold the sleeve back the other direction, away from the centre.

Long sleeves can be folded again down towards the hem.

Repeat on the other side.

Fold the collar end towards the bottom hem, making a rectangle.

Explanation:

Answer:

Weather is the state of the air and atmosphere at a particular time and place: the temperature and other outside conditions (such as rain, cloudiness, etc.) in a specific time and place. And how to fold clothes

Explanation:

Fold about a third in one side of the shirt towards the center.

Fold the sleeve back in the other direction, away from the center.

Long sleeves can be folded again down towards the hem.

Repeat on the other side.

Fold the collar end towards the bottom hem, making a rectangle.

Answer:

The answer is A

Explanation:

The earth naturally maintains the heat energy balance by absorbing a sufficient amount of sunlight energy by the terrestrial land and then reverting back the excess sunlight energy back to the space. The increase in abundance of greenhouse gases in the atmosphere results in absorption of sunlight energy which contains infrared photons this is responsible for increasing the global temperature levels hence, responsible for global warming. These infrared photons are reflected to the earth surface instead of sending back to the space. This is responsible for disturbing the heat balance.

Greenhouse gases interact with infrared photons and reflect them back to earth’s surface, hence option A is correct.

The burning of fossil fuels, logging of forests, and raising of livestock all have a rising impact on the climate and temperature of the planet.

This increases the greenhouse effect and causes global warming by adding a significant amount of greenhouse gases to those that are already present in the atmosphere.

The earth naturally maintains the balance of heat energy by receiving enough solar energy through the terrestrial land and then returning any excess energy to space.

Therefore, greenhouse gases such as CO₂ and N₂O interact with infrared photons and reflect them back to earth’s surface.

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To determine which air mass polygon in the source regions folder would most likely be characterized as a continental tropical (ct) air mass, we need to consider the characteristics of this type of air mass.

Continental tropical air masses originate in hot and dry regions, typically over deserts or semi-arid areas. As they move away from their source region, they can become very warm and dry, and are often associated with clear skies and high temperatures.
Based on these characteristics, the air mass polygon in the source regions folder that is most likely to be characterized as a continental tropical air mass would be the one covering the southwestern United States and northern Mexico. This region is known for its hot and dry climate, with temperatures often reaching well above 100 degrees Fahrenheit in the summer months. The air mass that originates from this region would be very warm and dry, and would likely move northward into the central and eastern United States, bringing with it hot and dry conditions.
It is important to note that air masses can change and evolve as they move away from their source region, so it is possible for a continental tropical air mass to become modified or transformed as it moves into different areas. However, based on the characteristics of the source region and the expected behavior of a continental tropical air mass, the southwestern United States and northern Mexico would be the most likely source region for this type of air mass.

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Answer:

The forensic scientist must be able to tell the difference between the substances.

Explanation:

It is important for forensic scientists to be able to identify particular drugs so they have evidence for the case that a certain drug was present.

The goal of forensic drug chemistry is to determine whether the material submitted contains an illegal substance.

The fizzing that occurs when sodium hydrogen carbonate (NaHCO3) is added to sulfuric acid (H2SO4) is due to a chemical reaction that produces carbon dioxide gas (CO2), water (H2O), and sodium sulfate (Na2SO4). The balanced chemical equation for this reaction is:

NaHCO3 + H2SO4 → Na2SO4 + CO2 + H2O

The fizzing occurs as the carbon dioxide gas is produced and released from the mixture.

The fizzing is fastest immediately after the NaHCO3 is added because at that moment, the surface area of the NaHCO3 particles is at its highest. This increased surface area provides more sites for the acid to react with, resulting in a greater number of reactions occurring simultaneously and a faster production of CO2 gas. As the reaction progresses, the surface area of the remaining NaHCO3 particles decreases, slowing down the rate of reaction and the production of CO2 gas.

Answer:

It reacts by fizzing and wearing away/dissolving the rock.

Explanation: