What advantage is there to using a counting unit (the mole) for amount of substance rather than a mass unit?

The smallest element in Period 2 is Fluorine. As we go across a period, from left to right, the atomic number increases. We are adding one proton to the nucleus and one electron to the valence shell. The force of attraction between the nucleus (positive) and the valence electrons (negative) also increases from left to right. That's why the atomic radius decreases from left to right, and the elements on the right side of the periodic table are smaller than the elements on the left.

Answer: Fluorine

The balanced for the reaction is:

2KI + Pb(NO₃)₂ → Pbl₂ + 2KNO₃

When the equation is balanced, the number of atoms for each element on both the reactant and product sides of the equation are equal. This can be seen below:

      Reactant   Product

K         2                 2

I          2                  2

Pb      1                    1

N       2                   2

O       6                  6

Answer:

3.46

⋅

10

−

19

J

The energy of a photon is proportional to its frequency, as stated by the Planck - Einstein's equation

E

=

h

⋅

ν

, where

E

- the energy of the photon

h

- Planck's constant, equal to

6.626

⋅

10

−

34

J s

ν

- the frequency of the photon

Now, notice that you are given the wavelength of the photon,

λ

. As you know, frequency and wavelength have an inverse relationship described by the equation

λ

⋅

ν

=

c

, where

c

- the speed of light in vacuum, approximately equal to

3

⋅

10

8

m s

−

1

This means that the relationship between energy and wavelength looks like this

λ

⋅

ν

=

c

⇒

ν

=

c

λ

E

=

h

⋅

c

λ

Another important thing to notice here is that the wavelength of the photon is given in nanometers,

nm

. You need to convert this to meters, the unit used for the value of the speed of light.

E

=

6.626

⋅

10

−

34

J

s

⋅

3

⋅

10

8

m

s

−

575

⋅

10

−

9

m

=

3.46

⋅

10

−

19

J

Explanation:

Brainliest please?

68.9g mass of the water would be boiled away

What is  specific heat capacity?

The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as its specific heat. Typically, calories or joules per gram per degree Celsius are used as the units of specific heat. For instance, water has a specific heat of 1 calorie (or 4.186 joules) per gram per degree Celsius.

The amount of energy necessary to raise the temperature of 1 kilogram of tissue by 1 K (=1°C) is referred to as the specific heat capacity of tissue.

Q= mcdeltT

  = 350g x 418J x (100-20)c

  =  117,040J

Q total = Q1+Q2

             =275000J - 117040 J

             =  157960 J (left in beaker)

Q = mdelt Hv

m = Q2/0h

    = 157960 J / 2260J/g

    = 69.8g

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The bond angles mentioned are approximate values based on the idealized tetrahedral (109.5°) and trigonal planar (120°) geometries associated with sp3 and sp2 hybridization, respectively.

A. The skeletal structure of C7H12BrNO can be represented as follows:

     Br

      |

 H - C - C - C - C - C - C - N - O

      |

      H

B. In the Kekule/Lewis structure, all bonds will be represented as sigma (σ) bonds. Since there are no double or triple bonds in the formula, there are no pi (π) bonds to be labeled.

C. The hybridization and bond angles for all carbon atoms in the compound are as follows:

- Carbon 1 (the carbon bonded to the bromine atom and one hydrogen atom): sp3 hybridization with bond angles of approximately 109.5°.

- Carbon 2 (the carbon in the middle of the chain): sp3 hybridization with bond angles of approximately 109.5°.

- Carbon 3 to Carbon 6 (the four carbon atoms forming the cyclohexane ring): sp3 hybridization with bond angles of approximately 109.5°.

- Carbon 7 (the carbon bonded to the nitrogen and oxygen atoms): sp2 hybridization with a bond angle of approximately 120°.

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Answer:

A mirror fog doesn’t fog up from a far distance because it does not have the circumstances to fog up. It must be at the same distance.

The fog in the mirror is the condensation of water vapor as it touches a colder surface. By running cold water you just cool down the bath tub and everything around it. Now the vapor coming from the hot shower will mostly condense right there and will not reach the mirror.

Answer:

C is the correct answer

I hope this helps you:)

Explanation:

C slower, and the substance will be a liquid

Answer:

B. Ca

Explanation:

Let's look at the electron configurations of all four elements (I am going to write it in noble gas configuration to make it simpler):

Mg electron configuration: [Ne]3s2

Ca electron configuration: [Ar]4s2

Ar electron configuration: [Ar]

K electron configuration: [Ar] 4s1

We notice that Ca has two electrons in the 4s sublevel, which satisfies what the question is asking for.

The answer is thus B. Ca.

Anything that includes water as a solvent is called an aqueous solution.

Answer:

the method is fractional distillation

1) a) The apparatus that can be used to separate a mixture of ethanol and water is called a fractional distillation apparatus. It consists of the following components:

b) The method of separation used in this apparatus is called fractional distillation.

2) In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revalorize.

Distillation flask: This is a round-bottomed flask where the mixture of ethanol and water is initially placed.

Fractionating column: A long column with several glass beads or plates. It provides a large surface area for the vaporized components to condense and revalorize, aiding in the separation process.

Thermometer: It is placed at the top of the fractionating column to monitor the temperature during the distillation process.

Condenser: It is a coiled glass tube connected to the fractionating column. Cold water flows through the condenser, causing the vaporized components to condense back into liquid form.

Receiver flask: This is where the separated components are collected. The receiver flask is placed at the end of the condenser.

b) The method of separation used in this apparatus is called fractional distillation. Fractional distillation is employed when the components of a mixture have similar boiling points. In the case of ethanol and water, they form an azeotropic mixture with a boiling point of around 78.2°C. Simple distillation would not effectively separate these two components because they would boil together and vaporize simultaneously.

In fractional distillation, the fractionating column provides additional surfaces for the vaporized components to condense and revaporize. This repeated condensation and revalorization process allows for more efficient separation. The higher surface area in the fractionating column helps to achieve better separation of the ethanol and water, resulting in a more concentrated sample of ethanol in the distillate collected in the receiver flask.

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When fumarate is reduced it gains 1h and 1e- to make succinate. This is because fumarate is a molecule involved in the Krebs cycle, and when it is reduced, it gains a hydrogen ion and an electron to become succinate. The correct option to this question is B.

This is due to the addition of a reducing agent, such as NADH or FADH2, which provides the hydrogen and electron needed for the reduction.

The explanation for this is that in the Krebs cycle, fumarate is a substrate that is converted into succinate through the addition of a reducing agent.

This reduction process involves the transfer of a hydrogen ion and an electron to fumarate, which results in the formation of succinate.

This process is an important step in the Krebs cycle, as it generates energy in the form of ATP.

If fumarate is reduced, it gains 1h and 1e- to make succinate. This process is a key step in the Krebs cycle and helps to generate energy for the cell.

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Answer:

Im not really sure what a half life is, but two of them would be 5.0 hours

Answer:

5 hours

Explanation:

cause if half life is 2.5hours we just multiply it by two and get 5 hours

Answer:

yo no se nada

Explanation:

solo se que no se nada xd

The conversion of ribulose-5-phosphate to glycolytic intermediates, the enzyme phosphopentose isomerase (ribose-5-phosphate isomerase) is utilized.

In the conversion of ribulose-5-phosphate to glycolytic intermediates, the enzyme used is phosphopentose isomerase, also known as ribose-5-phosphate isomerase.

Phosphopentose isomerase is responsible for catalyzing the interconversion of ribulose-5-phosphate (a pentose sugar) and ribose-5-phosphate (another pentose sugar).

This enzymatic reaction is part of the pentose phosphate pathway (also known as the phosphogluconate pathway) in cellular metabolism.

The conversion of ribulose-5-phosphate to ribose-5-phosphate is important for the production of various glycolytic intermediates, including fructose-6-phosphate and glucose-6-phosphate.

These intermediates play crucial roles in glycolysis, a metabolic pathway involved in the breakdown of glucose to produce energy in the form of ATP.

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Answer:

B

Explanation:

found it from a person wjwjdjjanqnqq

Ingsoc stands for "English Socialism" and is the political ideology in George Orwell's dystopian novel, "1984". It is the ruling party of the fictional state of Oceania, where the protagonist Winston Smith lives.

In the novel, the ruling party of Ingsoc uses language as a tool of oppression and power. The party develops a new language called Newspeak, which aims to eliminate any words that could be used to express dissent or rebellious ideas. The goal of this is to limit people's ability to think independently and challenge the authority of the party. Ingsoc is the ruling political ideology in George Orwell's "1984" that uses language as a tool of oppression and power. It develops a new language called Newspeak to limit people's ability to think independently and challenge the authority of the party. Through language manipulation, propaganda, and censorship, Ingsoc maintains its power over the people of Oceania.

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Ingsoc stands for "English Socialism" and is the political ideology in George Orwell's dystopian novel, "1984".

It is the ruling celebration of the fictitious country of Oceania, in which the protagonist Winston Smith lives. In the novel, the ruling celebration of Ingsoc makes use of language as a device of oppression and strength. The celebration develops a brand new language referred to as Newspeak, which pursuits to cast off any phrases that might be used to explicit dissent or rebellious ideas. The aim of that is to restriction humans's cappotential to assume independently and undertaking the authority of the celebration. Ingsoc is the ruling political ideology in George Orwell's "1984" that makes use of language as a device of oppression and strength. It develops a brand new language referred to as Newspeak to restriction humans's cappotential to assume independently and undertaking the authority of the celebration. Through language manipulation, propaganda, and censorship, Ingsoc keeps its strength over the humans of Oceania.

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The correct answer is option C.

In order for a solute to be called an electrolyte, the solute must be an ionic compound.

What is an electrolyte?

In Chemistry, electrolyte is defined as a substance or medium that can conduct electricity or electrical charges.

In general, an electrolyte can be ionic compound or covalent compound that act as solute and produce ions upon dissolving in a liquid such as water.

Chemically, when ions dissociate they move across the solution and conduct electricity.

Most common examples of electrolytes are salts, bases and acids that splits up into ions when added to a polar substance e.g. water.

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(a) First, we need to write the combustion reaction for ethanol (CH3CH2OH)

CH3CH2OH + O2 → CO2 + H2O

Then, we need to balance this equation. To do that, remember to start with C, then move on to H and finally balanced the amount of O:

CH3CH2OH + 3 O2 → 2 CO2 + 3 H2O

(b) Since this is a reaction that realeases heat (726.7 kJ /mol of ethanol), we know that is an exothermic reaction and the general scope of an enthalpy diagram would be like this:

Where, for the combustion of ethanol, the reactants would be CH3CH2OH + O2, the products would be CO2 + H2O, and ΔH would be -726.7 kJ/mol

Molality is a measure of concentration and is defined as the number of moles of solute per kilogram of solvent. Molality is typically represented by the symbol "m" and is expressed in the unit of moles per kilogram (mol/kg). Therefore, the correct answer is D) m.

Molality (not molatilty) is indeed a measure of concentration, specifically the amount of solute per kilogram of solvent. It is denoted by the symbol "m" and is expressed in units of moles of solute per kilogram of solvent (mol/kg).

Molality is different from molarity, which is another concentration unit that expresses the amount of solute per liter of solution (mol/L or M).

To clarify, molality is measured in moles of solute (not solvent) per kilogram of solvent (not solute). Therefore, the correct answer is D) m (moles per kilogram).

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According to the graph, only the reactant A was present at the beginning of the reaction.

The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.

In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.

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Answer:

1) it takes 13 second

2) 2100 miles

3) 40 miles / hours

4) 730 meters

Answer:2.3×10^11

Explanation:since scientific notation is as a×10^k with 0<a<=9

The order of strength of hydrogen bonds, dispersion forces, and dipole-dipole forces is as follows: Hydrogen bonding , Dipole-dipole interactions ,London dispersion forces.

Hydrogen bonding: Hydrogen bonding is the strongest type of intermolecular force. It occurs when a hydrogen atom is covalently bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and is attracted to another highly electronegative atom in a nearby molecule. An example of a molecule that exhibits hydrogen bonding is water (H2O). Dipole-dipole interactions: Dipole-dipole interactions are slightly weaker than hydrogen bonding, but still stronger than London dispersion forces. They occur between molecules that have permanent dipoles, or regions of partial positive and negative charge. An example of a molecule that exhibits dipole-dipole interactions is acetone (CH3COCH3). London dispersion forces: London dispersion forces are the weakest type of intermolecular force. They are attractive forces that occur between all types of molecules and result from the temporary separation of charge that occurs as a result of the movement of electrons within a molecule. An example of a molecule that exhibits London dispersion forces is hexane (C6H14).

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Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 18.015 g

volume = 15 cm³

We have

\(density = \frac{18.015}{15} \\ = 1.000833333...\)

We have the final answer as

Hope this helps you

Explanation:

Crude oil is a naturally occurring fossil fuel - meaning it comes from the remains of dead organisms.

Crude oil is made up of a mixture of hydrocarbons - hydrogen and carbon atoms.

It exists in liquid form in underground reservoirs in the tiny spaces within sedimentary rocks. Or it can be found near the surface in oil sands.

It is often found alongside natural gas and saline water.

Crude oil is often interchangeably referred to as petroleum. This is because petroleum includes both the unrefined crude oil as well as refined petroleum products.

It is non-renewable - once it’s gone it’s gone and cannot be easily replaced.

Answer:

It's right

Explanation:

Answer:

a cell or battery

Explanation:

this is because a voltaic cell is such a cell where chemical energy gets converted to electrical energy. the energy conversion in the case of an electrolytic cell is from electric to chemical (battery supplies electrons to the anode respectively). So, I feel by adding a cell or battery, we can change the way energy conversion takes place, thereby changing the process.

ice particles have a strong bonding and arranged regularly so the atom is very close bond to each other in regular arrangement.

the liquid bonding is weaker than ice and the movement of atom is slightly flow around so the atom is slighty close to each other,

vapor bonding is weaker than the liquid and the atom movement is in all direction so the atom of water in this state is far apart from each other and move in all direction