consider the following reaction at equilibrium: 2no₂(g) ⇌ n₂o₄(g) the ∆h° for this reaction is < 0. if the volume of the container is decreased by ½ while the temperature is kept constant, in which direction will the equilibrium shift?

The process of standardization involves calculating the precise concentration (molarity) of a solution. One type of analytical process that is frequently employed in standardization is titration. A precise volume of one chemical is reacted with a known quantity of another substance in a titration.

The endpoint of a titration is the point at which the reaction is finished. The endpoint is indicated (signaled) using an indicator chemical substance. Phenolphthalein is the indicator utilized in this experiment. Organic compound phenolphthalein is colorless in acidic solution and pink in basic solution.

In this standardization, a sample of potassium acid phthalate (KHP; HKC8H4O4) will be titrated with a sodium hydroxide solution (NaOH) to measure the molarity of the NaOH.

HKC8H4O4 + NaOH -----> NaKC8H4O4 + H2O

(1.502 g KHP)(1 mol / 204.23 g KHP ) = 6.267 x 10-4 mol KHP

(6.267 x 10-4 mol KHP)(1 mol NaOH / 1 mol KHP) = 6.267 x 10-4 mol NaOH

6.267 x 10-4 mol NaOH / 0.02854 L NaOH = 0.0220 M NaOH

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       P2H2 has an oxidation number of +1. In P2H2, the oxidation    

        number of H is -1

       C has an oxidation number of +3 in H2C2O4. O has an oxidation

        number of -2 in H2C2O4. H2C2O4 has an oxidation number of +1.

         CrO2 has an oxidation number of +4.

The oxidation state, also known as the oxidation number, is an atom's hypothetical charge if all of its bonds to other atoms were fully ionic.

The sum of the oxidation states of all the atoms in an ion equals the ion's charge.

A substance's more electronegative element is given a negative oxidation state. The one that is less electronegative is given a positive oxidation state.

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Answer:

burning of candle

Explanation:

because a candle is at a solid state when it burn it changes into liquid substance and when it dry it returns to solid

Answer:

1. B, E

2. A

Explanation:

Two stable isotopes of lithium, 6Li and 7Li, make up naturally occurring lithium; 7Li is the more prevalent of the two (92.5% natural abundance).

The total amount of protons and neutrons in an atom makes up the mass number. A whole number, that is. The average number of protons and neutrons among an element's natural isotopes is known as the atomic mass. It has decimal form.

The total number of protons and neutrons in an isotope's nucleus is referred to as the mass number. This is due to the fact that each proton and neutron has a mass of one atomic mass unit (amu). You may get the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.

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Answer:

Explanation:

C=20

H=50

Mass is not conserved when the chemical reaction occurs inside the body.

Mass is converted into energy when reactions within the mass occur. Nuclear reactions violate the law of conservation of mass. No new atoms are created during the reaction and no existing atoms disappear or are destroyed showing that mass is conserved. Mass can not be conserved because a little amount of mass turns into energy in every chemical reaction. But mass + energy is always conserved. Energy can only be created by destroying the specific amount of mass according to the equation of energy i.e. E = mc².

So we can conclude that nuclear reactions are the cause due to which mass is not conserved.

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Answer:

8.59 g/cm3

Explanation:

mass = 535,000 mg = 535,000 x 10^-3 g = 535 g

volume = 62.3 cm3

density = m/V = 535 / 62.3 = 8.58747993579 g/cm3 or 8.59 g/cm3

The proteins are the first to assemble in the organelle called the irregular endoplasmic reticulum and then the proteins are transported by an organelle known as the Golgi bodies.

Protein cargo moves from the ER to the Golgi is modified within the Golgi and is sent to various destinations in the cell, including the lysosomes and the cell surface. The Golgi procedure proteins are made by the endoplasmic reticulum (ER) before getting off them to the cell. All channel proteins and carrier proteins allow solutes to cross the membrane without the use of energy is called passive transport, or facilitated diffusion. These proteins, and specific genes within its DNA must first be transcribed into molecules of mRNA; then, these transcripts must be translated into chains of amino acids, which later folded into fully functional proteins. The organelle that transports proteins is called the endoplasmic reticulum.

So we can conclude that the endoplasmic reticulum is responsible for the production of protein and transported by the Golgi bodies.

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In this case, rinse the separating funnel with acetone into a garbage container and wash it again with soap and water before using it for the future experiment.

A separatory funnel, also called a separation funnel, separating funnel, or simply a sep funnel, is a piece of lab equipment used in liquid-liquid extractions to partition a mixture's components into two immiscible solvent phases of different densities. separating funnels must be free of pollutants that could lower the extraction's yield. After cleaning and rinsing, the funnel might be put in a desiccation to allow the water on the body to dry before being utilized for the subsequent extraction step. Standard laboratory procedures include washing all laboratory equipment before use, regardless of how clean it is.

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Answer: 3 Figures

Explanation:

Calculate 345.009 g - 23.009 g and give your answer with the appropriate number of significant figures. 322.000 g.

there bud

In the summer, the Moxie's tank will be under 110.5 atm of pressure.

The right answer is C.

The pressure law states that for a given quantity of gas, provided the volume stays constant, the pressure exerted on the container's sidewalls is exactly proportional to the absolute temperature of the gas.

Briefing: The mathematical formulation of this rule is

[tex]\frac{P_1}{T_1 }= \frac{P_2}{T_2}[/tex]

where

The initial pressure is P1.

P2 is the ultimate pressure.

T1 is the initial temperature.

T2 is the final temperature.

As the gas's temperature rises, so does its pressure.

The pressure within the Moxie's tank will thus be greater than 50 atm throughout the summer since summer temperatures are higher than winter ones.

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To get the number of neutrons use the formula i.e. No. of neutrons=mass number-atomic number. Therefore , 28–14 = 14neutrons.

Silicon-28 atom is the stable isotope of silicon with relative atomic mass 27.9769265.

By multiplying the proton and neutron counts of the exact isotope that interests you, you may always find the relative mass of an element. For instance, an atom of carbon-12 has a relative atomic mass of 12 due to its composition of 6 protons and 6 neutrons.

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Considering the structure of the atom, neutrons and protons are the two subatomic particles found in an element's nucleus.

All atoms are made up of:

In summary, protons and neutrons are part of their nucleus and electrons revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged.

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1. (i) Magnesium 1

No of protons: 12

No of electrons: 12

No of neutrons: 12

Mass number: 24

(ii) Magnesium 2

No of protons: 12

No of electrons: 12

No of neutrons: 13

Mass number: 25

(iii) Magnesium 3

No of protons: 12

No of electrons: 10

No of neutrons: 13

Mass number: 25

2. Magnesium 1: Atom

       Magnesium 2: Atom

       Magnesium 3: Ion

3. Isotopes of Magnesium

4. Heaviest magnesium isotope: ²⁶ Mg

5. 5.1) Charge = -12

       5.2) Charge = +12

6. Relative charge of magnesium 3 is +2

Magnesium has 3 stable isotopes. Isotopes have same number of proton.

If the proton and electron is equal in an element, it is an atom. If it differs, it becomes an ion.

The relative charge of a proton is +1 and the relative charge of an electron is -1.

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The percent of alcohol in the blood is found to be 0.1739%.

Given:

Volume of [tex]Cr_2O_7^{2-}[/tex] = 35.46mL

Molarity of [tex]Cr_2O_7^{2-}[/tex] = 0.05961M

Molar mass of [tex]C_2H_5OH[/tex] = 46.07g/mol

Mass of Plasma = 28.00g

The balanced equation for the titration reaction of percent of alcohol in the blood is:

[tex]16H^+ (aq) + 2Cr_2O_7^{2-} (aq) + C_2H_5OH (aq) \rightarrow 4Cr^{3+} (aq) + 2CO_2 (g) + 11H_2O (l)[/tex]

To find:

Percent of alcohol in the blood = ?

Formula:

Percent of alcohol in the blood = Mass of alcohol / mass of plasma x 100

Calculations:

The No. of moles of [tex]Cr_2O_7^{2-}[/tex] in 35.46 mL of 0.05961 M [tex]Cr_2O_7^{2-}[/tex] are:

35.46 x 0.05961= 2.114 x [tex]10^{-3}[/tex] mol

2:1 is the molar ratio of [tex]Cr_2O_7^{2-}[/tex] to alcohol in the blood ([tex]C_2H_5OH[/tex]).

Therefore, the no. of moles of [tex]C_2H_5OH[/tex] are 1/2 x 2.114 x [tex]10^{-3}[/tex] = 1.057 x [tex]10^{-3}[/tex] mol

The molar mass of alcohol ([tex]C_2H_5OH[/tex]) is 46.07g/mol.

The mass of alcohol corresponding to 1.057 x [tex]10^{-3}[/tex] moles is:

1.057 x [tex]10^{-3}[/tex] x 46.07 = 0.04870g

The percent of alcohol in the blood of 28.00 g plasma is:

(0.04870 /28.00) x 100 % = 0.1739%

Result:

0.1739% alcohol is present in 28g blood plasma.

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The first step in the production of fatty acids is the conversion of acetyl-CoA to malonyl-CoA by the enzyme acetyl-CoA carboxylase.

Starting at carbon atom 3, the -carbon of the fatty acyl chain, fatty acids undergo oxidative removal of successive two-carbon units as acetyl-CoA in the first step. Palmitoyl ACP is produced after a continuous cycle of transfer, elongation, reduction, dehydration, and reduction. The 16-carbon fatty acid palmitate is then released from the FAS by the FAS complex's thioesterase activity.

The process of oxidizing fatty acids to create acetyl-CoA. In essence, fatty acids produce NADH and FADH2 for every two carbons in the chain as they are broken down into an acetyl CoA.

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Main sequence stars with low temperatures tend to have low luminosity is based on Hertzprung-Russell diagram

The bright, hot stars in the image's upper left are the main sequence group, which stretches roughly diagonally to the lower right (dim and cool). In the bottom left are white dwarfs, which are small, faint, and hot. In the top right are giant and supergiant stars, which are big, bright, and cool.

Main sequence stars have a wide range of effective temperatures, but because they are brighter at higher temperatures, they normally follow a band from the bottom right to the top left of the diagram. Inside the cores, hydrogen and helium are fusing together.

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Answer: White dwarfs

Explanation: edge2020

A substance's ability to be observed or measured without altering its identity is referred to as its physical property.  How successfully a substance can undergo a specific chemical transition is determined by its chemical characteristic.

A substance's ability to be observed or measured without altering its identity is referred to as its physical property. Physical characteristics might include things like color, density, hardness, melting, and boiling points, among other things. How successfully a substance can undergo a specific chemical transition is determined by its chemical characteristic.

Based on their physical and chemical properties, materials can be grouped. Matter is anything that has mass and space. It is possible to mix any solid, liquid, and gas. When a substance changes from one state of matter to another without changing its chemical composition, a physical transition takes place.

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Answer:

3.29 grams NaCl

Explanation:

I assume 0.45m is 0.45 molar.  The m is usually capitalized, to prevent confusion with meters, moles, etc. : 0.45M

It is very useful to use of the definition of molar in the thought process.

The definition of molar, M, is moles solute per liter of solution.  The term 0.45M NaCl means that a solution has 0.45 moles of NaCl in 1 liter of solution.  a half-liter would have 0.225 moles of NaCl, which is equivalent to 0.45 moles/liter. in terms of concentration.

We'll need the molar mass of NaCl, which is:

Na:  23.0

Cl:   35.5

       58.5 grams/mole

========

Now let's calculate how many moles of NaCl are needed.  We want 125ml (0.125L) of 0.45M NaCl.

(0.45 moles NaCl/Liter)

multiply that by the actual volume required:

(0.45 moles NaCl/Liter)*(0.125Liter) = 0.0563 moles NaCl

[The liters unit cancels, leaving only moles NaCl.  The units are helpful in understanding the mathematical steps required and help insure a correct answer.]

To get grams NaCl, multiply by the molar mass of NaCl:

(0.0563 moles NaCl)*(58.5 grams NaCl/mole NaCl) = 3.29 grams NaCl

Note the units:  moles NaCl cancel, leaving grams NaCl.

=====

There is a useful relationship to remember concerning the dilution of a solution.  It is not needed here, but it does highlight the usefulness of understanding units.  When diluting a volume, V1, of a solution of concentration M1 to achieve a concentration and volume of of M2 and V2, we can use:

  M1V1 = M2V2

Example:   125 ml of 1M HCl is needed for an experiment.  The only supply is 5M HCl.  How much of the 5M HCl is needed to make 125ml of the 1M HCl?

M1 = 5M HCl

V1 = The unknown

M2 = 2.5M HCl

V2 = 100 ml

M1V1 = M2V2

(5M)*(V1) = (1M)*(125ml)

V1 = (1M)*(125ml)/(5M)

V1 = 25 ml

25 ml of 5M HCl may be added to 75 ml of water (slowly) to form 100ml of 2.5M HCl.

===========

Extra material:  This is not relevant to the original problem, but it demonstrates the importance of units and the fact that it is the moles of a substance that is the important element.  

If the concentration and volume of M1V1 are in moles/liter and liter, the term M1V1 has units of:

(moles/Liter)*(L), which reduces to moles of the substance.

The same with the term on the right, M2V2:  it also reduces to moles.  So the equation is simply saying that whatever number of moles one starts with, the same number of moles will wind up in the final solution.

A bonus discovery is that the volume units cancel in this calculation.  It seems unlikely, but this means the volumes don't need to be adjusted from ml to liters, since volume unit cancels out.

If the original problems stated that the goal is to make 125 ml of 0.45M NaCl from a stock of 1.0M NaCl solution, the calculation would be:

M1 = 1.0M NaCl

V1  = ?

M2 = 0.45M NaCl

V2 = 125 ml

M1V1 = M2V2

(1.0M)*(V1) = (0.45M)*(125ml)

V1 = 56.25 ml

68.75 ml of water may be added to 56.25 ml of NaCl to form 125 ml of 0.45M NaCl.

Although M is expressed as moles/liter, we don't need to convert the volumes to liters, because the M unit cancels out.  That doesn't feel correct, but it is - the unit cancellation is legal.

Answer:

KCIO4 → KCI + 2O2

Explanation:

KCIO4 → KCI + 2O2

From the calculations, the energy of the ultraviolet waves is 1.7 * 10^-33 J.

The term wavelength has to do with the distance that have been covered by a wave. In this case, we are told that the photon is from the ultra violet portion of the electromagnetic spectrum. The question here is that we should find the energy of the  ultraviolet photon having a wavelength of 1.18 x 10^8 m.

Let us now look at the things that we have in the question as the parameters that could be used to solve the problem;

Wavelength of the wave = 1.18 x 10^8 m

Plank Constant = 6.6 * 10^-34 Js

Speed of light = 3 * 10^8 m/s

Now we have that;

E = hc/λ

E =  6.6 * 10^-34 Js *  3 * 10^8 m/s/1.18 x 10^8 m

E = 1.7 * 10^-33 J

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Answer:

nanoparticle cancer drugs could act like biological missiles that destroy tumors while minimizing damage to healthy organs

The ion of the element from above which has the greatest ionic radius is S²- ( sulphur ion )

The correct answer choice is option b.

It follows that distance between the nucleus of an ion to that till that point it influence on its electron cloud, is referred to as the ionic radius of an ion of an element. Within the context of this task, the atomic radius of sulphur ion is 184 ppm.

Furthermore more, this periodic trend of elements, that is, the ionic radius decreases across the period but increases down the group.

So therefore, we can correctly deduce from the explanation above that S²- has the largest ionic radius.

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The binary ionic compounds for the given elements are KBr, [tex]CaH_2[/tex] , [tex]Li_3N[/tex], and [tex]AlCl_3[/tex] respectively.

Ionic compounds are neutral substances made of cations, which are positively charged ions, and anions, which are negatively charged ions. The name of the cation is written first, followed by the name of the anion, for binary ionic compounds (ionic compounds that only contain two types of elements).

The ions of two separate elements, one of which is a metal and the other a nonmetal, make up a binary ionic compound. For instance, sodium iodide, or NaI, is made up of iodide ions, or [tex]I^-[/tex] (elemental iodine is a nonmetal), and sodium ions, or [tex]Na^+[/tex] (because sodium is a metal).

The given element pairs for the following binary ionic compounds:

KBr - Potassium Bromide

[tex]CaH_2[/tex] - Calcium Hydride

[tex]Li_3N[/tex] - Lithium Nitride

[tex]AlCl_3[/tex] - Aluminum Chloride

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In the course of chemiosmosis, hydrogen ions build up in the mitochondrion's intramembrane space to produce a significant electrochemical gradient for aerobic cellular respiration.

Protons are pumped through specialized channels in the mitochondrial membranes from the inner to the outer compartment during chemiosmosis. A gradient of proton (H+) is created by the pumping. Protons diffuse through a transport protein called ATP synthase to diffuse down the gradient once it has been formed.

Electrons are transferred from one molecule to another in the electron transport chain, and the energy released during these electron transfers is used to create an electrochemical gradient. The energy held in the gradient is utilized in chemiosmosis to produce ATP.

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In the response, the correct options are:

Deoxyribonucleic acid (DNA) can be defined as a polymer composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.

Although DNA is exceptionally long and therefore may seem impossible to fit in nucleus, it is contained in very a condensed and folded form. This form is called the DNA complex, chromatin. When paired with other genetic material such as histone proteins, this leads to creation of chromosomes.

The DNA stores instructions for making other large molecules, called proteins. These instructions are stored inside each of your cells, distributed among 46 long structures called chromosomes. The chromosomes is built up of thousands of shorter segments of DNA, called gene

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Answer:

In the response, the correct options are:

DNA is twisted in a double helix.

DNA is wrapped around proteins.

DNA is condensed into chromosomes are all correct.