define all the physical features of earth​

Answer:

4.0 kg

Explanation:

M = W/g = 39.2/9.8 = 4.0 kg

sorry if its wrong-

Answer:

its B People from different regions have different cultures, values and languages.

Explanation:

i just took the assignment

Answer:

A

Explanation:

I just know.

We need to add 1.17 × 10⁻⁴ moles of NaOH to 200.0 mL of 0.200 M HF to make a buffer with a pH of 3.10.

To make a buffer solution, we need to have a weak acid and its conjugate base or a weak base and its conjugate acid in a solution. Here, we have HF, which is a weak acid. So we need to add a strong base, NaOH, to form the conjugate base of HF, F⁻.

The Henderson-Hasselbalch equation for a buffer is:

pH = pKa + log([A⁻]/[HA])

where pH is the desired pH, pKa is the dissociation constant of the weak acid, [A⁻] is the concentration of the conjugate base, and [HA] is the concentration of the weak acid.

First, let's calculate the ratio of [A⁻]/[HA] required to achieve a pH of 3.10:

3.10 = -log[H⁺] = -log(1.0 × 10⁻³.¹)

[H⁺] = 7.94 × 10⁻⁴ M

pKa = 6.8 × 10⁻⁴

[H⁺] = [HF] = 7.94 × 10⁻⁴ M

[NaF] = [OH⁻] = x M

HF + OH⁻ → F⁻ + H₂O

The equilibrium constant for this reaction is:

Kw/Ka = [F⁻][H⁺]/[HF][OH⁻]

Since we want to achieve a pH of 3.10, we can calculate the [H⁺] and use the equation above to find the [OH⁻] required to achieve the desired pH:

Kw/Ka = [F⁻][H⁺]/[HF][OH⁻]

1.0 × 10⁻¹⁴/6.8 × 10⁻⁴ = x(7.94 × 10⁻⁴)/(0.200-x)

Solving for x, we get:

x = 5.87 × 10⁻⁴ M

This is the concentration of NaOH required to make a buffer with a pH of 3.10. To find the quantity in moles, we can multiply the concentration by the volume:

moles NaOH = concentration × volume

moles NaOH = (5.87 × 10⁻⁴ M) × (0.200 L)

moles NaOH = 1.17 × 10⁻⁴ mol

Therefore, we need to add 1.17 × 10⁻⁴ moles of NaOH to 200.0 mL of 0.200 M.

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1) Gas P is hydrogen as hydrogen burns with a pop sound

2) OH -ve is the ion responsible for making Q alkaline

3)Since OH (-ve ) ion is responsible so it must be basic means Ph is more than 7 or can say between 7 and 14

4)Reaction of calcium with cold water:

Ca (s) + 2H2O (l) --> Ca(OH)2(aq.) + H2 (g)

So basically it is an experiment you also can perform when you hold a lighter near the bubble that formed during the reaction it will burn out with a pop sound.

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Hydrogen bonds can form between molecules that contain hydrogen atoms covalently bonded to nitrogen (N), oxygen (O), or fluorine (F) atoms, and another molecule containing nitrogen, oxygen, or fluorine atom(s) with a partial negative charge.

Examples of molecules that can form hydrogen bonds with identical molecules include:

Water (H2O): Water molecules can form hydrogen bonds with each other, resulting in strong intermolecular forces that give rise to unique properties such as high boiling point, surface tension, and capillary action.

Ammonia (NH3): Ammonia molecules can also form hydrogen bonds with each other due to the presence of a lone pair of electrons on the nitrogen atom.

Hydrogen fluoride (HF): Hydrogen fluoride molecules can form hydrogen bonds with each other, which contributes to its relatively high boiling point despite its small size.

Other molecules that contain N, O, or F atoms, such as alcohols, carboxylic acids, and amines, can also form hydrogen bonds with identical molecules or other molecules containing N, O, or F atoms with partial negative charges. Hydrogen bonding plays a crucial role in many biological processes and chemical reactions, and its understanding is important in various fields of science and technology.

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Entropy is a measurable physical characteristic and a scientific notion that is frequently connected to a condition of disorder, unpredictability, or uncertainty.

Molar enthalpy is the amount of energy per mole. Enthalpy is a thermodynamic quantity that corresponds to a system's total heat content according to this definition. It is equivalent to the system's internal energy plus the sum of the pressure and volume products. This value's unit of measurement is KJ/mol.

Entropy is assumed to be 1 kB/particle

kB: Boltzmann Constant = 1.3806*10^(23)/JK

Entropy, S = 1.3806*10^(-23) /JK

We are aware that S = Q/T

provided T = 83.85 k

and that Q = S*T = S*83.85k = 1.157*10(-21) J / particle.

Since 1 mole = 6.022x1023 particles of heat energy,

the formula for an is 1.157*10(-21)*6.022*10^23, which is 6.967*102 J/mole.

Argon's molar enthalpy is Q/n,

where n is the number of moles,

and ΔH equals 0.6967 KJ/mole.

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5.00 moles of a binary, group 2 oxide are found to have a mass of 521 g. The group 2 metal is Strontium.

According to question 5 moles of binary group 2 metal oxide mass =521  g

So, 1-mole metal oxide mass will be =521 / 5=104.2 g

Now, as metal oxide is group 2 oxide so metal: oxygen =1: 1

So the mass of metal is =104.2-16=88.2 gm (as the atomic mass of oxygen is 16 g

Therefore, the metal is Strontium(Sr) whose atomic mass is 87.62 g which is nearly 88.2 gm

So, the formula of metal oxide is SrO

The group two metal here is Sr which is strontium and lies in the same group as calcium.

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If a balloon has a volume of 33000 L, the amount of hydrogen that would be needed to fill will be 29.46 kg.

At standard temperature and pressure, 1 mole of any gas is equivalent to 22.4 L of the gas.

The capacity of the balloon is 33000 L. The number of moles of hydrogen gas that will fill the balloon can be calculated using dimensional analysis as follows:

1 mole = 22.4 L

33000 L = 1 x 33000/22.4

               = 1473.21 moles

This means that 1473.21 moles of hydrogen will be required to fill the balloon.

Recall that: mole = mass/molar mass

Hence: mass = mole x molar mass

Molar mass of hydrogen gas = (1+1)

                                                = 2 g/mol

We can then use the above formula to calculate the mass of 1473.21 moles of hydrogen.

mass of 1473.21 moles hydrogen = 1473.21 x 2

                                                       = 2946.43 grams

2946.43 grams to kg = 2946.43/1000

                                   = 29.46 kg

In other words, if a balloon has a capacity of 33000 L, the amount of hydrogen that would be required to fill it will be  29.46 kg.

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Signals you would expect to observe as the parent peak in the mass spectrum of meldonium, the compound associated with tennis superstar Maria Sharapova's athletic doping incident is 147. The correct answer is A.

Meldonium is a small molecule with a molecular weight of 146.19 g/mol. The parent peak in the mass spectrum of meldonium is therefore expected to be at m/z = 147.

This is because the parent peak represents the molecular ion, which is the intact molecule with all of its electrons stripped away. The mass of the molecular ion is equal to the molecular weight of the molecule.

The mass spectrum of meldonium also shows a number of fragment ions, which are created when the molecular ion breaks apart. These fragment ions can be used to identify the molecule and to determine its structure.

The mass spectrum of meldonium is a valuable tool for the identification and analysis of this drug. It can be used to detect meldonium in urine, blood, and other biological samples. The mass spectrum can also be used to determine the concentration of meldonium in a sample.

Meldonium is a banned substance in sports. Athletes who test positive for meldonium can be suspended from competition. The mass spectrum of meldonium can be used to detect this drug in athletes and to ensure that they are competing fairly.

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The following is the order of metallic character from least metallic character to most metallic character:-

Beryllium → Magnesium → Calcium → Strontium → Barium

Metallic character refers to the level of reactivity of a metal. Metals tend to lose electrons in chemical reactions, as indicated by their low ionization energies.

Within a compound, metal atoms have relatively low attraction for electrons, as indicated by their low electronegativities.

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Answer:b

Explanation:

The polarity of 6 real molecules are given below,

O2- Neutral

HF- Acidic

H2O- Neutral

NH3- Basic

CF4-Nonpolar

CH3F-  Polar

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Transcription: Builds strands of mRNA, takes place in the nucleus, and uses RNA polymerase.

Translation: Takes place in ribosomes, builds a protein, uses tRNA (transfer RNA), and involves codons and anticodons.

Transcription and translation are two fundamental processes involved in gene expression, which is the process by which genetic information in DNA is used to create functional proteins. Transcription is the process by which an RNA molecule is synthesized from a DNA template. It occurs in the nucleus of eukaryotic cells and the cytoplasm of prokaryotic cells.

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Answer:

Metals are tough because of an effect called plasticity

Explanation:

if you want to know more go to this site

https://en.wikibooks.org/wiki/A-level_Physics_(Advancing_Physics)/Metals#:~:text=Metals%20are%20tough%20for%20the,This%20effect%20is%20called%20plasticity.

Answer:

The strength of metal depends upon the status of its molecular bonding in the lattice. Stronger the forces stronger will be the metal.

Answer:

it supports the conservation of mass as the mass on both sides are equal and the conservation of mass states the total mass of the products and  the total mass of the reactants will be the same in a chemical reaction.

Explanation:

Hope this helps you :)

The addition of NaOH will shift the equilibrium to the left, while the addition of HCl will shift the equilibrium to the right. The direction of the shift depends on the reactants added and their reaction with the components of the equilibrium.

If NaOH is added to the solution, it will react with HNO2 to form the conjugate base NO2^- and water. This will increase the concentration of NO2^- and decrease the concentration of HNO2, causing the equilibrium to shift towards the left to restore equilibrium.

As a result, there will be a decrease in the concentration of H3O+ ions and an increase in the concentration of NO2^- ions.

On the other hand, if HCl is added to the solution, it will react with the conjugate base NO2^- to form HNO2 and chloride ions. This will increase the concentration of HNO2 and decrease the concentration of NO2^-, causing the equilibrium to shift towards the right to restore equilibrium.

As a result, there will be an increase in the concentration of H3O+ ions and a decrease in the concentration of NO2^- ions.

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Approximately 17.8 liters of H2 gas, measured at 745 mmHg and 87 °C, are required to synthesize 0.48 mol of CH3OH.

To determine the number of liters of H2 gas required to synthesize 0.48 mol of CH3OH, we need to use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 87 °C + 273.15 = 360.15 K.

Next, we need to convert the pressure from mmHg to atmospheres (atm) since the ideal gas law requires pressure in atm:

P = 745 mmHg * (1 atm / 760 mmHg) = 0.979 atm.

Using the ideal gas law, we can rearrange the equation as V = (nRT) / P and plug in the values:

V = (0.48 mol * 0.0821 L·atm/(mol·K) * 360.15 K) / 0.979 atm ≈ 17.8 L.

Therefore, approximately 17.8 liters of H2 gas, measured at 745 mmHg and 87 °C, are required to synthesize 0.48 mol of CH3OH.

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Answer:

- Carbon shares four of its electrons, and each oxygen shares two of its electrons.

Explanation:

Carbon needs 4 electrons to reach a full outer shell while oxygen needs 2 to reach a full outer shell.

Answer:

A toad on lily pad

Explanation:

have a great day

Answer:

Its unreactive since its outer shell is filled up and also does not form a covalent bonding.

Step 1

The reaction:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l) (compelted and balanced)

----------------

Step 2

Information provided:

0.0105 M HBr

125 mL of 0.0100 M Ca(OH)2

----------------

Step 3

The number of moles of Ca(OH)2:

Molarity (mol/L) = moles of Ca(OH)2/volume of the solution (L)

Volume = 125 mL x (1 L/1000 mL) = 0.125 L

Therefore,

Molarity x volume (L) = moles

0.0100 mol/L x 0.125 L = 1.25x10^-3 moles of Ca(OH)2

-----------------

Step 4

The number of moles of HBr, by stoichiometry:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l)

1 mol Ca(OH)2 ------ 2 moles HBr

1.25x10^-3 moles ------ X

X = 1.25x10^-3 moles x 2 moles HBr/1 mol Ca(OH)2

X = 2.5x10^-3 moles HBr

----------------

Step 5

The volume of HBr needed:

Molarity = moles of HBr/volume of solution (L)

Volume = moles of HBr/molarity

Volume = 2.5x10^-3 moles HBr/0.0105 mol/L

Volume = 0.238 L

Volume = 0.238 L x (1000 mL/1 L) = 238 mL

Answer: 238 mL or 0.238 L (there are no matches)

Answer:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.

Explanation:

Answer:

The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.

Explanation:

It is possible for citric acid and baking soda to create water because they are both chemical compounds that can react with each other to create new compounds.

When citric acid and baking soda are mixed together, they undergo a chemical reaction known as a neutralization reaction. This type of reaction occurs when an acid and a base react to form salt and water.

In this case, citric acid is an acid and baking soda is a base. When they are mixed together, the acid and base neutralize each other, creating a salt compound and water. The acid and base cancel out each other's properties and neutralize the solution. The acid donates a proton (H+) to the base, and the base accepts it to form water.

The gas that was measured by the students, is the carbon dioxide (CO2) that is produced as a byproduct of this reaction. As the acid and base react, they release carbon dioxide gas, which is 4.2 grams more than they had at the start. The reaction can be written as follows:

\(C_{6}\)\(H_{8}\)\(O_{7}\) \(_{(aq)}\) + \(NaHCO_{3}\) \(_{(s)}\) → \(NaC_{6}\)\(H_{5}\)\(O_{7}\) \(_{(aq)}\) + \(H_{2} O\) \(_{(l)}\) + \(CO_{2}\) \(_{(g)}\)

In conclusion, citric acid and baking soda produce water and carbon dioxide (CO2) when they react together in a neutralization reaction. The reaction creates a new compound, salt, and water, while the gas created is carbon dioxide.

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One tube has a buffered solution + acid and the other tube has water + acid. To decide whether or not the solution is buffered, a simple pH test can be done. An acid-base indicator can be used to determine the pH of each solution.

A buffered solution is defined as a solution that can withstand minor changes in pH upon the addition of small amounts of an acid or base.

Consider the following steps:

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1 Rolaids tablet can neutralize 235 mg of HCl, the calculations are shown in the below section.

First, we have to find the amount of acid (HCl) that is present in the stomach. It is estimated that about 0.16 M HCl is present in the stomach, which is produced by parietal cells.  It is clear that the density of HCl is similar to that of water. Hence, the density of HCl is taken as 1 g/mL. Now we need to find out the amount of HCl that is present in the solution. Let's calculate it.

Molarity = moles / volume (L)

0.155 = moles / 1 mole/1000 mL

moles = 0.155 × 1/1000 = 1.55 × 10⁻⁴ mol

Number of moles of HCl in 1000 mL of HCl solution is 1.55 × 10⁻⁴ mol.

Now let's calculate the mass of HCl in 1000 mL of the solution.

Molar mass of HCl = 36.5 g/mol mass of 1.55 × 10⁻⁴ mol of HCl = 36.5 × 1.55 × 10⁻⁴ = 0.005 m g

Volume of 1 Rolaids tablet = 20 mL

Density of Rolaids tablet = 1.6 g/mL

Mass of 1 Rolaids tablet = density × volume = 1.6 g/mL × 20 mL = 32 g

Mass of HCl neutralized by 1 Rolaids tablet is 47 times its own weight of HCl solution.

Hence, the amount of HCl neutralized by 1 Rolaids tablet is 0.005 × 47 = 0.235 g = 235 mg.

This means that 1 Rolaids tablet can neutralize 235 mg of HCl.

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A reaction's rate constant rises from 10.0 to 100. when the temperature rises from 300°C to 400°C 45.6 kJ/mol is the activation energy.

The activation energy for the reaction can be calculated using the Arrhenius equation, which relates the rate constant to the activation energy and the temperature. The Arrhenius equation is: k = A * e^(-Ea/RT). Where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature. By rearranging the equation to solve for Ea, we get: Ea = -RT * ln(k/A)We know that k1 = 10.0 s^-1 at T1 = 300 K, and k2 = 100. s^-1 at T2 = 400 K. We can use these values to calculate the activation energy: Ea = -(8.314 J/mol*K) * (400 K - 300 K) * ln(100/10)=Ea ≈ 45.6 kJ/mol.

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Answer:

13.Teeth breaking down the food in your mouth

14. Water evaporates from the surface of the ocean

15.a rusted old truck in your neighbors driveway chemical change

16.cream being whipped physical change

17.mowing the lawn is a physical change

18.fireworks exploding chemical change

19. physical change squeezing oranges to make orange juice

20.melting butter for popcorn physical change

21.baking an apple pie

22.slicing a piece of pie for your friend

23.frying an egg chemical change

24.shredding paper

25.curdling milk

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