What are the benefits of observing a chemical and physical change

Answer: If 550 ml of gas at 1 atm expands to 960 ml, the pressure will be 0.57 atm.

Explanation:

It is an exercise of Boyle's Law that says: "At constant temperature the volume of a mass of a gas is inversely proportional to the pressure it exerts".

This means that if the volume is doubled the pressure is halved, and if the pressure is increased three times as much, the volume will be one third (1/3) of what it originally was.

The word inversely proportional means that if the pressure increases the volume decreases but proportionally.

550 mL of gas at I atm is expanded to 960 mL. What will the pressure be?

Data:

V₁ = 550 mL

P₁ = 1 atm

V₂ = 960 mL

P₂ = ?

The formula of this law is:

Where

He asks us what the pressure would be after 960 mL, we solve the formula for the final pressure, then

\(\boxed{\bold{P_1V_1=P_2V_2 \iff \ P_2=\frac{P_1V_1}{V_2} }}\)

We substitute our data in the cleared formula and solve:

\(\boxed{\bf{P_2=\dfrac{(1 \ atm \ \times \ 550\not{mL}) }{960\not{mL}} }}\)

\(\boxed{\bf{P_2=0.57 \ atm }}\)

If 550 ml of gas at 1 atm expands to 960 ml, the pressure will be 0.57 atm.

Answer:

It responds to the environment.

It grows and develops.

It produces offspring.

It maintains homeostasis.

It has complex chemistry.

It consists of cells.

The isoelectric point (pI) of polyampholytes, including proteins, refers to the pH at which the net charge of the molecule is zero

The number of positively charged groups (like amino groups) and negatively charged groups (like carboxyl groups) are equal at the isoelectric point. As it affects their behavior and characteristics, such as solubility, electrophoretic mobility, and protein-protein interactions, the isoelectric point is a crucial aspect of polyampholytes. The polyampholyte typically has a net negative charge above the isoelectric point and a net positive charge below the isoelectric point. The content and arrangement of the amino acids in the polyampholyte affect the specific value of the isoelectric point.

Understanding how polyampholytes behave in various settings, such as biological systems or industrial applications, is dependent on knowing how their isoelectric point influences their stability, aggregation, and usefulness. The isoelectric point of polyampholytes, such as proteins, can be discovered experimentally using methods like electrophoresis or potentiometric titration.

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Because of these properties, cadmium (Cd) could also be identified as a transition metal.

Cadmium (Cd) is a solid at room temperature, forms an ion that has a +1 or +2 charge, is a less reactive metal, and forms more than one unique compound with a given nonmetal.

Transition metal, any of various chemical factors which have valence electrons i.e., electrons that can participate inside the formation of chemical bonds in two shells as opposed to simplest one.

Transition metals are determined within the periodic desk among the s-block and p-block elements. Hence, they are known as d-block elements. Transition metals are unstable metals that display transitional conduct between s and p block elements, therefore their name.

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Answer:the branch of science which examines the material of the universe and changes that these materials undergo

Chemistry deals with composition,structure,properties of matter and changes that these materials undergo

Answer:

5 mol NaOH = 5 mol NaClO

Plantear y balancear reacción: NaOH + HClO ⇒ NaClO + H2O

Como se puede apreciar, los coeficientes estequiométricos son uno por lo tanto, la cantidad de NaClO que se genera será igual a la cantidad de moles que reaccionan de NaOH

325 g of water would be need to make an 89% plutonium aqueous solution by mass, if the total solution is 3500 grams.

This problem is solved by using the concept of total mass percentage

Total mass percentage can be given as

Mass percentage = sum of mass percentage of elements in solution.

100% = 89% of plutonium aqueous solution by mass+ x V of water solution by mass

(100 - 89)% = x% of water solution by mass

11 % = x% of water solution by mass

mass percentage of water =( mass of water / mass of total solution) × 100

11 / 100 = mass of water / mass of total solution

mass of water =( 11/ 100) × 3500

= 325 g.

Thus, we concluded that 325 g of water would be need to make an 89% plutonium aqueous solution by mass, if the total solution is 3500 grams.

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Taking into account the definition of molarity, molar mass and dilution:

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

\(molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{L}\).

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

If the bleach is a 0.70 mol/L solution of sodium hypochlorite and is required to prepare 1.5 L of chlorine bleach, replacing in the definition of molarity you get:

0.70 \(\frac{moles}{L}\)=\(\frac{number of moles}{1.5 L}\)

Solving:

0.70 \(\frac{moles}{L}\)× 1.5 L= number of moles

1.05 moles= number of moles

The molar mass of sodium hypochlorite is 74.44 g/mol. So you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 74.44 grams, 1.05 moles of the compound contains how much mass?

\(mass=\frac{1..05 molesx74.44 grams}{1 mole}\)

mass= 78.162 grams

Finally, the mass of sodium hypochlorite (NaClO) required is 78.162 grams.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

12 mol/L× 420mL= Cf× 2000 mL

Solving:

(12 mol/L× 420mL)÷ 2000 mL= Cf

2.52 mol/L= Cf

In summary, the final concentration of a sodium hydroxide solution is 2.52 mol/L.

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Answer:

The melting properties of agar make it useful for growing bacteria in a lab.

Explanation:

Answer:

heymate !

Explanation:

The air pressure is higher at sea level and lower at higher altitudes ( top of the mountain ) .

This is because as we go higher and higher the air in the surroundings become thinner and thinner. And this does not suit you as your blood pressure at high altitudes are comparatively higher compared to the pressure around you at the top of the mountains .

And that is why some of us face breathing issues or nose bleeding due to the imbalance in the atmosphere .

And as we go lower below the sea level the pressure of air around us increases.

And that is why swimmers were tough suits while going down below the sea level, so that their bodies don't get crushed under the extreme pressure on the bottom of the sea .

There are also chances of the skull to get crushed if we don't were the suit while we are under he sea .

hope it would help !

The main assumption to make is that the density of 5% vinegar is equal to the density of water. Then, for the purposes of the calculation, it is easiest to assume a certain volume of 5% vinegar is used. With these assumptions, we can calculate that the molarity of the solution is 0.83 M.

To calculate the molarity (c) of the solution, we need the number of moles (n) of solute and the volume (V) of the solution:

c = n/V

If we assume that we have 100 mL of 5% vinegar and that its density (d = 1.00 g/mL) is equal to the density of water, we can calculate the mass of the solution (m) using its density and volume (V = 100 mL = 0.100 L):

d = m/V ⇒ m = d*V

m = 1.00 g/mL * 100 mL

m = 100 g

Now we can use the mass and mass percentage (%m = 5% = 0.05) to calculate the mass of acetic acid (AcOH) present:

m(AcOH) = %m * m(solution)

m(AcOH) = 0.05 * 100 g

m(AcOH) = 5 g

Using the mass of AcOH we can calculate the number of moles (n) present by using the molar mass of AcOH (M = 60 g/mol):

n = m/M

n = 5 g / 60 g/mol

n = 0.083 mol

Finally, we calculate the molarity:

c = 0.083 mol / 0.1 L

c = 0.83 M

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Answer:

divide the distance by the average

Explanation:

ash QC ok

Answer:

Ethanoic Acid

Explanation:

Stirring is only required to dissolve sucrose sugar in water.

What is solubility?

Solubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. The opposite characteristic, insolubility, refers to the solute's incapacity to create a solution. The solvent is often a solid or a liquid, whereas the solute may be a solid, liquid, or gas. Both could be solution-based compounds or pure chemicals. Except in extremely rare circumstances, gases are always miscible in all ratios, and the only way a solid or liquid may be "dissolved" in a gas is by first becoming gaseous.

Temperature, pressure, and the makeup of the solute and solvent (including their pH and the presence of additional dissolved materials) are the key determinants of solubility.

Hence, stirring is only required to dissolve sucrose sugar in water.

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Answer:

atomic number

Explanation:

Answer:

Explanation:

0.76 V

The voltmeter shows that the standard cell potential of a galvanic cell consisting of a SHE and a Zn/Zn2+ couple is E°cell = 0.76 V.

The Ka for the acid HA is approximately 7.39×10⁻⁹. This value represents the acid dissociation constant, which is a measure of the strength of the acid. A lower Ka value indicates a weaker acid.

The Ka for an acid HA can be calculated using the given equilibrium concentrations of HA, H3O+, and A-. In this case, the equilibrium concentrations are [HA]=1.3 M, [H3O+]=9.8×10⁻⁵ M, and [A-]=9.8×10⁻⁵  M.

To determine the Ka, we will use the expression:
Ka = ([H₃O+] × [A-]) / [HA]

Now, we will substitute the given values into the equation:
Ka = (9.8×10⁻⁵  M × 9.8×10⁻⁵  M) / (1.3 M)
Ka = (9.604×10⁻⁹ M²) / (1.3 M)
Ka = 7.388×10⁻⁹

Therefore, the Ka for the acid HA is approximately 7.39×10⁻⁹. This value represents the acid dissociation constant, which is a measure of the strength of the acid. A lower Ka value indicates a weaker acid, while a higher Ka value indicates a stronger acid.

In this case, the Ka of 7.39×10⁻⁹ suggests that the acid HA is a weak acid, as it has a relatively low dissociation constant.

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Answer:

0.0307

Explanation:

Let us consider the ionization of this acid in water:HA(aq)+H2O(l)↽−−⇀H3O+(aq)+A−(aq)The equilibrium constant expression for this reaction is as follows: Ka=[H3O+][A−][HA]. given the concentrations of each of these species, so we simply plug them in (minus the units, as the equilibrium constant is unitless). Ka=(0.225)(0.225)1.65=0.0307

Answer: catabolism

Explanation:

Catabolism refers to the set of metabolic pathways which is necessary for the breaking down of molecules into smaller units. This is then oxidized for the release of energy or can be used to perform other anabolic reactions.

Catabolism is regarded as the opposite direction of anabolism which is simply the building-up of molecules. It should be noted that anabolism and catabolism work together in every living organisms and perform functions such as the production of energy and the repair of cells.

The correct order of reactivity towards electrophilic aromatic substitution is:

b.) Phenol > benzene > chlorobenzene > benzoic acid

Phenol is more reactive than benzene towards electrophilic substitution reactions due to the presence of the -OH group (hydroxyl group) attached to the benzene ring. The lone pair of electrons on the oxygen atom in the -OH group can donate electron density to the ring, making it more nucleophilic and facilitating electrophilic attack.

Benzene, although less reactive than phenol, can still undergo electrophilic substitution reactions due to its aromaticity and delocalized electron system.

Chlorobenzene is less reactive than both phenol and benzene because the chlorine atom is an electron-withdrawing group. It withdraws electron density from the benzene ring, making it less nucleophilic and less prone to electrophilic substitution.

Benzoic acid is the least reactive among the options given. The carboxylic acid group (-COOH) is an even stronger electron-withdrawing group than the chlorine atom in chlorobenzene. It further reduces the electron density on the benzene ring, decreasing its reactivity towards electrophilic substitution.

Therefore, the correct order of reactivity towards electrophilic substitution is option b.

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the complete question is:

The correct order of reactivity towards electrophilic aromatic substitution is?

a.) Benzene > phenol > benzoic acid > chlorobenzene

b.) Phenol > benzene > chlorobenzene > benzoic acid

c.) Chlorobenzene > benzoic acid > phenol > benzene

d.) Benzoic acid > chlorobenzene > benzene > phenol

Answer:

depends on the element it's reacting with..

Explanation:

if the another element requires less energy to loose electron then zinc will become negatively charged and hence becomes acidic radical..

normally if it is reacting with element with valency 4 and Atomic number less than it(Ti,Si,C) then it will lose electron and gain positive sign and henve becomes basic radical..

Answer:

B) rate of growth I'd say

Explanation:

it sounds better I don't think anyone would use height of plants if they want to sound professional

Answer:

decreases

Explanation:

warm water hold less dissolved oxygen than cold water because the molecules are moving faster.

Answer: The amount of CO2 found in the atmosphere varies over the course of a year. Much of this variation happens because of the role of plants in the carbon cycle

Answer: what is the question

Explanation:

Answer:

All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex! Inside each cell, atoms make up molecules, which make up cell organelles and structures. In multicellular organisms, similar cells form tissues.

Explanation:

Answer:

All living organisms are composed of one or more cell

Explanation:

hope this helps, please mark brainliest

ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

1) Radius of the n = 8 orbit is 33730 pm. 2) 5.22 x 10^-19 J is the energy in kilojoules of a mole of photons of this frequency. 3) (a) energy is E = -8.7 x 10^-19 J, (b) energy is E = -2.7 x 10^-19 J, (c) energy is E = -6 x 10^-19 J

1. The Bohr model of the atom describes the electrons of an atom as being in specific energy levels (orbits) around the nucleus. The radius of each orbit is proportional to the principal quantum number (n) of the electron.

The radius of the n = 8 orbit in a N6+ ion can be calculated using the equation:

r = 0.529 x 10^-10 m x (n^2)

r = 0.529 x 10^-10 m x (8^2)

r = 0.529 x 10^-10 m x 64

r = 3.373 x 10^-9 m

r = 3.373 x 10^-9 m x 10^12 pm

r = 33730 pm

2. The energy of a photons can be calculated using the equation:

E = h x f

E = (6.626 x 10^-34 Js) x (7.95 x 10^14 s^-1)

E = 5.22 x 10^-19 J

3. To calculate the energy of a mole of photons, we need to know Avogadro's number (6.022 x 10^23 photons/mol)

Energy per mole of photons = (E of single photon) x (Avogadro's number)

Energy per mole of photons = (5.22 x 10^-19 J) x (6.022 x 10^23 photons/mol)

Energy per mole of photons = 3.15 x 10^5 J/mol

Energy per mole of photons = 315 kJ/mol

a) The energy of the n = 5 level of a H atom can be calculated using the equation:

E = -13.6 eV x (1/n^2)

E = -13.6 eV x (1/5^2)

E = -13.6 eV x 0.04

E = -0.544 eV

E = -0.544 eV x (1.60218 x 10^-19 J/eV)

E = -8.7 x 10^-19 J

b) The energy of the n = 9 level of a H atom can be calculated using the equation:

E = -13.6 eV x (1/n^2)

E = -13.6 eV x (1/9^2)

E = -13.6 eV x 0.0123

E = -0.167 eV

E = -0.167 eV x (1.60218 x 10^-19 J/eV)

E = -2.7 x 10^-19 J

c) The energy for the n = 5 to n = 9 transition can be calculated by subtracting the energy of the initial state from the energy of the final state.

E = Efinal - Einitial

E = (-2.7 x 10^-19 J) - (-8.7 x 10^-19 J)

E = -6 x 10^-19 J

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Answer:

Only 2moles are produced from it

Answer:

2N2+02>_2N20

Explanation:

u have to use rap formula