22. A
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The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.

The average speed of molecules is defined as the average speed  of all individual the molecules. this mean it is equal to sum of speed of all the molecule divide by total no. of molecules.

Average speed ( V ) = [tex]\sqrt{8RT / \pi M}[/tex]

given :

Temperature of molecule T1 = 25°C = 298 K

Average velocity of water at 25°C ,V1 = 640 m/s

Temperature T2 = 100°c = 373 K

Average velocity of water at 100°C ,V2 = ?

now, computed the data, we get

V2 / V1 = [tex]\sqrt{T2 / T1}[/tex]

V2 / 640 m/s = [tex]\sqrt{373 K / 298 K}[/tex]

V2 =     715.8 m/s.

Thus,The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.

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Explanation:

B → Boron → Atomic number 5

Be → beryllium → Atomic number 4

B - Hybridization → 1S² 2S² 2P¹

[tex] \sf Boron - \boxed{↿↾} \: \boxed{↿↾} \: \boxed{ \small↾ }\huge\boxed{ }\huge\boxed{ }[/tex]

Be - Hybridization → 1S² 2S²

[tex] \sf Beryllium →\boxed{↿↾} \: \boxed{↿↾} \: \huge\boxed{ }\huge\boxed{ }\huge\boxed{ }[/tex]

from above data we can see that the outermost orbital of Beryllium i.e. 2S is fully filled & that of boron have 1 electron in 2P orbital. It will require more energy to remove one electron from beryllium Because it will disturb the stability, on other hand the boron will lose one electron easily to attain full filled outermost electron hence it will require less energy for 1st ionization.

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Answer:

Wait what, howd he do that

Pb[tex](NO_{3} )_{2}_{(aq)}[/tex] + 2NaBr[tex]_{(aq)\\}[/tex] → Pb[tex]Br_{2}_{(s)}[/tex] + 2[tex]NaNO_{3}_{(aq)}[/tex]

Lead nitrate solution is added to sodium bromide solution, which results in the formation of solid lead nitrate and the retention of sodium nitrate solution.

Ensure that the equation takes into account the states of each reactant and product. Sodium bromide with Lead (II) Nitrate

Here, lead(II) nitrate (Pb(NO3)2) is combined with sodium bromide (NaBr). White precipitate is the end result.

Salt bromide with silver nitrate

Here, silver nitrate is combined with sodium bromide (NaBr) (AgNO3). White precipitate is the end result.

The lead(II) bromide precipitate is produced by the reaction between solely the lead(II) ions and bromide ions. Before and after, separate potassium and nitrate ions are present.

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Answer:

Explanation:

1.) Which statement best describes force?

answer: Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.

2.) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?

answer: The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.

3.) Which of the following scenarios accurately describes magnitude and direction?

answer: A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.

4.) What is force directly proportional to?

answer: the acceleration and mass of an object

5.)Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?

answer: The box exerts 10 N of force downward.

Hope this helps :)

A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN is accurate scenario to explain magnitude and direction.

Force is a vector quantity that measures both direction and magnitude of a push or pull on an object . It can also be explain as , force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction.

The direction towards which the force is applied is known as the direction of the force, It is represented by F and unit is Newton & S.I. unit is kg ·m/s².

F = ma

Where, m is the mass of body and a is the acceleration of the body .

Acceleration of a body or an object is given as, the rate of change of the velocity of an object with respect to time. The unit of acceleration is m/s².

a = Δv/Δt

Where , Δv is the change in acceleration and Δt change in time .

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K and L values for each substance are 108g and 18g, respectively.

Solubility is the formation of a new bond between solute molecules and solvent molecules. Solubility is the maximum concentration of solute that dissolves in a known concentration of solvent at a given temperature in terms of quantity.

We calculated the solubility of NaCl in 100g of water to be 36g.

Lead Nitrate solubility in 100g water = 54g

Determine the value of L:-

200Kg sodium chloride solubility = 36g

100kg Sodium chloride Solubility = [tex]\frac{36g}{100kg} *200kg[/tex] = 18g

Determine the value of K:-

100Kg Lead Nitrate Solubility = 54g

200kg Lead Nitrate Solubility = [tex]\frac{54g}{100kg} *200kg[/tex] = 108g

Solubility difference = solubility of K - solubility of L

Solubility difference = 108g - 18g = 90g

Thus, the 108g and 18g, are the values for K and L respectively.

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Answer:

309041.2

Explanation:

The number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.

The number of molecules in a substance can be calculated by multiplying the number of moles in that substance by Avogadro's number.

Firstly, the number of moles in 60mg of vitamin C must be calculated as follows:

Molar mass of C6H8O6 = 12(6) + 1(8) + 16(6) = 176g/mol

number of moles = 0.06g ÷ 176g/mol = 3.41 × 10-⁴moles

Number of molecules = 3.41 × 10-⁴moles × 6.02 × 10²³

Number of molecules = 2.053 × 10¹⁸ molecules

Therefore, the number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.

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Sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water, so the best term to describe this would be aqueous solution.

Aqueous solutions are the solutions that contain liquid water in them as the solvent that is used to dissolve the various solutes.

When we mix this sugar, flavorings, coloring agents, and carbon dioxide together, we have the aqueous solution of soda.

The word aqueous, which is derived from the Greek aqua, denotes that it is dissolved in or related to water.

It is shown in chemical equations by adding (aq) to the relevant chemical formula.

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Complete Question

Sodas typically contain sugar, flavorings, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be _____.

A) an aqueous solvent

B) an aqueous solution

C) a solution

D) a solvent

E) a solute

Answer:58°C

Explanation:

I believe this is the answer

0.03125 kg/31.25 g will remain after 151 years.

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The average atomic mass of Lithium is found to be 6.94 amu. Thus, (d) is the correct answer.

Atomic mass is the total number of protons and neutrons present in the nucleus of the atom when it is at rest. On comparison with protons and neutrons, electrons have negligible mass and thus atomic mass is the total sum of protons and neutrons.

Given:

% abundance of Li-6, Li6 = 7.5%

% abundance of Li-7, Li7 = 92.5%

Atomic mass of Li-6, m6 = 6.015 amu

Atomic mass of Li-7, m7 = 7.016 amu

To find:

Average atomic mass = ?

Formula:

Average atomic mass, [tex]Avg = \frac{(Li6 * m6) + (Li7 * m7)}{100}[/tex]

Avg = [tex]\frac{(7.5 * 6.015) + (92.5 * 7.016)}{100}[/tex]

Avg = (45.1125 + 648.98) / 100

Avg = 694.0925 / 100

Avg = 6.940 amu

Result:

Therefore, 6.94 amu is the average atomic mass of Lithium.

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The most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.

Chemistry is fundamental in environmental sciences because we need to know all forces that bond materials, atoms and objects in nature, which can only be achieved by having a real consideration of chemistry.

In conclusion, the most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.

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Answer:

Test the water with an actual test or put something that would react to acid in water to test it.

Explanation:

test the water for acidic contents

Claim- the water is acidic

Evidence- the test said it had an acidic composition

conclusion- the water is acidic

Using Avogadro’s number, 0.33 moles of tin are present.

The number of particles (atoms or molecules) in each mole of a material is known as the Avogadro’s number. It's represented with a symbol [tex]N_A[/tex].

Avogadro's number of molecules of that substance make up one mole of an atom, according to the mole concept.

1 mole = 6.02 x [tex]10^2^3[/tex] atoms

Given:

No. of atoms of tin = 2.01 x [tex]10^2^3[/tex]

Avogadro’s number, [tex]N_A[/tex]= 6.02 x [tex]10^2^3[/tex]

To find:

No. of moles, n = ?

Formula:

n = No. of atoms of tin / Avogadro’s number

Calculations:

n = 2.01 x [tex]10^2^3[/tex] / 6.02 x [tex]10^2^3[/tex]

n = 2.01 / 6.02

n = 0.33 moles

Result:

The number of moles present in 2.01 x [tex]10^2^3[/tex] atoms of tin is 0.33 moles

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Answer: 4

Explanation:

The equilibrium constant can be obtained using ΔG°rxn = -RT lnK.

On the basis of this, 2H+ + 2e- → H2(g) reduction.

Therefore E° = 0V

Pb2+ + 2e- ⇄ Pb(s) - 0.126

Mg2+ + 2e- ⇄ Mg(s) -2.372

For total E°cell potential,

E°cell = Ered - Eoxd

Eoxd = -Ered of the one being oxidised

E°cell = -2.372 - (-0.126) = -2.246

E°cell = -2.246 V

Thus, calculating dG:

dG = -n x F x E°cell

dG = -2*96500*(-2.246)

=433478 J/mol

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The Covid-19 pandemic has raised awareness of a situation that can be surprisingly unpleasant for many people: asking for help. From practical difficulties, like finding someone to do your food shopping, to emotional ones, like dealing with anxiety and sadness alone.

Problems with mental health do not resolve themselves. Treatment and recovery may be more challenging the longer an illness lasts. When anxiety and trauma are not addressed, they can both worsen and result in panic episodes and post-traumatic stress disorder. an incapacity to handle issues or regular tasks. a sense of detachment or disconnect from daily activity imaginative or unusual thinking. excessive worry persistent melancholy, depression, or apathy.

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The ocean floor is largely made of Volcanic rock formed by magma from earth’s mantle that cools and hardens.

The ocean's bottom is referred to as the seabed, seafloor, ocean floor, and ocean bottom. All oceanic floors are referred to as "seabeds." The various types of sediment that make up practically the whole ocean floor include mud, sand, and gravel.

Deposits of minerals we need every day, such copper, zinc, nickel, gold, silver, and phosphorous, can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimetres (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.

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The most reasonable explanation is, Sodium chloride and Water are both polar compounds while Glucose is nonpolar.

Since glucose is a non-polar compound while NaCl is polar, we know that polar compounds will dissolve in polar solvents while non-polar compounds will dissolve in non-polar ones. water also dissolves NaCl but not glucose because it is a polar molecule.

Due to their bonds with elements like nitrogen, oxygen, or sulfur, polar compounds have distinct zones of positive and negative charge.

Non-polar covalent compounds, on the other hand, are those in which there is no change in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.

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Standardization titrant was made by dissolving 0.5634 g of potassium hydrogen phthalate (KHP) in 50.00 mL of water.

1 mol of KHP will react with 1 mol of NaOH to form 1 mol of mixed salt and 1 mol of water. Based on this molar ratio, the number of moles of NaOH will be equal to the number of moles of KHP in the standardization titrant.

c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP

This result can help us calculate the amount of KHP present in the whole 50.00 mL of the titrant:

22.20 mL : 0.001225 mol = 50.00 mL : X

X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol

Following that, we can use the KHP molar mass (204.22 g/mol), to get to the mass of it (in grams) dissolved in the sample:

n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g

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1025 g of aluminum with 912.0 g of oxygen should she react together.

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The particles will lose kinetic energy and increase the temperature during boiling. Temperature measures the heat of particles. The flat portions show where kinetic energy is energy.

Kinetic energy is a type of energy that a moving object or particle has. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.

A moving object or particle has kinetic energy, which relies on both its mass and its rate of motion. The kind of motion might be vibration, rotation on an axis, translation (or travel along a path from one point to another), or any combination of these.

Therefore the correct options are 1- B, 2-B, and 3-A.

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The physical property of both drinks that we can calculate based on the data obtained is density

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula, we get:

d(regular coca cola) = m(regular coca cola)/v(regular coca cola)

d(regular coca cola) = 384 g / 380 ml

d(regular coca cola) = 1.0105 g/ml

d(diet coca cola) = m(diet coca cola)/v(diet coca cola)

d(diet coca cola) = 370 g / 380 ml

d(diet coca cola) = 0.9737 g/ml

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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From Smallest to Largest:

Br

I

Al

Ga

Answer:

3- True or false: it is OK to leave your bags in the aisle

4- True or false: horseplay is fine before or after the lab

5- True or false: you do not need goggles or gloves for lab

6- True or false: you do not need to wash your hands after lab

7- True or false: it is OK to eat and drink in a lab class

8- True or false: it is OK to pour chemicals back into the bottle it came from

9-True or false: microscopes can be handled with one hand only

10-True or false: you do not need to read the instructions before lab

11-True or false: respect safety rules and guidelines​

Explanation:

I bolded the ones that it's supposed to be. You're teacher gave you a lot of false's though

Order of solar system :

1. A solar nebula develops.

3. The solar nebula is pulled in on itself by gravity.

5. The solar nebula continues to rotate quickly.

2. The solar nebula becomes flat and forms a disk.

4. Gas turns hot and dense and develops into a star.

It is a cloud with a disc shape.

It is made up of the gas and dust left over after the sun forms.

The following are the steps involved in the creation of the solar system:

A solar nebula first appears after the sun is formed.

In the subsequent stage, gravity uses its force to pull the nebula toward it.

This force causes the nebula to travel too swiftly.

Gravity causes the nebula to spin quickly, giving it the appearance of a disc.

Finally, this disc-shaped nebula's temperature rises, making the gases inside it hot and heavy.

This results in a "star" (ball of fire) being produced in the end.

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The complete question is:

Put these steps of solar system formation in order.

1) A solar nebula forms.

2) The solar nebula flattens into disk

3) gravity pulls the solar nebula upon itself

4) gas becomes hot and dense and forms a star

5) the solar nebula spins faster and faster