what would you say to a classmate who said that he wanted to fulfill his science requirement by taking environmental science to get out of chemistry

When a cell is placed in a hypotonic solution (Solution A) water enters the cell toward the area of higher solute concentration. Hence, the cell gains water and swells up which increases the internal pressure.

A hypotonic solution is one in which the concentration of solutes is higher within the cell than outside it, whereas a hypertonic solution is one in which the concentration of solutes is higher outside the cell than inside it.

As a result, when a cell is initially placed in Solution B, which is hypertonic compared to Solution A, water will leak out of the cell and the cell will shrink.

Next, this cell will be moved to Solution A, which is hypotonic relative to Solution B, and at this point, the concentration of solute inside the cell is larger than that outside of it, resulting in less solute and more water in the solution. Due to the increased water content outside the cell, there is a net migration of water from the outside into the cell. Therefore, the cell absorbs water and swells up, resulting in a rise in internal pressure.

Note: Water/solvent always goes from a higher concentration to a lower concentration.

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Answer:

Into what protein structure is spider silk found?

= Primary structure

I HOPE IT HELP YOU

An element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.

Electrons may be defined as the type of sub-atomic particles which are consistently revolving around the nucleus of an atom. These particles are negatively charged in nature. It may be thought that J.J. Thomson discovered the electrons for the very first time.

The electronic configuration of an element that possesses 20 electrons is [tex]1s^2 2s^22p^63s^23p^64s^2[/tex]. So, the 4s orbital is completely filled. Now, the gained electron must enter the 3d orbital in order to systematize the electronic configuration. The electrons will fill up the five 3d orbitals and finally the three 4p orbitals to complete energy level 4.

Therefore, an element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.

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Answer:

60 electrons and 62 protons

Explanation:

62 is the

mass number and proton number  its plus 2 charge so it has to be 60 electrons

One gram of sodium chloride takes longer to dissolve in a solution of 2M glucose than in pure water. This is because sodium chloride will encounter a greater frequency of collisions in a 2M glucose solution than in water. This shows that diffusion occurs more slowly in a solution containing a solute than in pure water.

If you were to put one gram of sodium chloride in a beaker of pure water, it would eventually dissolve. However, if you were to put the same amount of sodium chloride in a beaker of water that also contained two moles of glucose, it would take longer for the sodium chloride to completely dissolve.

The reason for this is that, in a solution with more molecules present, the sodium chloride would encounter more collisions. This would lead to a slower diffusion rate, and thus, a longer time for the sodium chloride to completely dissolve.

In general, solutions with more molecules present will have a slower diffusion rate than solutions with fewer molecules present. So, if you want the sodium chloride to dissolve quickly, it's best to put it in a pure water solution.

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Water molecules can react with each other according to the equation below:

2H2O ⇌ H₃O⁺ + OH⁻

If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product.

Equilibrium can be defined as the state in which both reactants and products are present in concentrations and they have no chances to change with time. It is also the state of a reaction in which the rates of the forward and reverse reactions are the same. This means there is no observable change in the properties of the system.

So therefore, water molecules can react with each other according to the equation below:

2H2O ⇌ H₃O⁺ + OH⁻

If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product

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The amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.

The energy of a substance can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, 5.0 grams of lead needs to be raised from 25°C to 35°C, the amount of energy needed can be calculated as follows:

Q = 5 × 0.129 × {35°C - 25°C}

Q = 6.45J

Therefore, the amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.

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An acid is able to produce ions in the aqueous solution because polar H-A bond break due to the attraction between H atoms and the O atoms of water.

When an acid is dissolved in an aqueous solution, it forms hydrogen ions along with a conjugate base.

After dissolving in water, an acid dissociates to form hydrogen ions or H+ ions which reacts with water molecules to form hydronium ions i.e. H3O+.

Let's take this, the dissociation of hcl produces h+ ions and cl- ions in water.

HCl      ⇄     H+ + cl-

The ions in aqueous solution help in electricity conduction. In the absence of water acids can not dissociate.

To put it simply, acids produce ions only when they are added to water.

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Explanation:

Fill the buret with the liquid you wish to deliver and read the volume. It is not necessary to adjust the level of the liquid to exactly 0.00 ml

The chemical group which is most likely to be responsible for an organic molecule behaving as a base is Amino group.

Amines are the nitrogen containing organic bases.

Simple organic molecules such as methylamine, H₃N-CH₃, and ethylamine, H₃N-CH₂CH₃ are known as the bronsted bases.

Functional group is defined as a group of atoms in molecule having different chemical properties and provides some characteristics to the molecule. The functional group is attached to the carbon atom in a molecule.

Functional groups can behave as a base or an acid depending on the ability of the structure to accept or to donate the H⁺ ions.

Amino group is represented as :

               R        

                    NH₂

                    . .      

Amino group is having the ability to accept the H⁺ ions, and it forms NH₃⁺.

                 --NH₂ + H⁺ →  NH₃⁺

So, Amino group is most likely to be responsible for an organic molecule behaving as a base.

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Answer:

5

Explanation:

3 6 5 7 0

Red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 percentage by mass of each metal in the jewelry is 94,4732031% of gold and 5,5267969% of copper

Here given data is

Red gold weighs = 9.67 g and  volume of gold = 0.620 cm3 and density of gold = 19.3 g/cm3 and density of copper = 8.96 g/cm3

So here we have to calculate percentage by mass = ?

19.3x +  8.96y = 8.62

x + y = 0.475 this is the volume

x = 0,421947674 and y = 0,0530523256

So, 19.3 × 0,421947674 × 100% / 8.62 =  94,4732031% of gold

and 100-94,4732031 = 5,5267969% of copper

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The total heat added is obtained as 26.36 kJ.

We know that heat is the form of energy that exists due to the temperature difference between two bodies. Now when we heat water, we add heat to the water and the effect is that the temperature of the water would begin to rise and this owes to the heat that we have added to the water.

We know from the question that;

Mass of water =  10.0 g

Specific Heat capacity of liquid water =  4.18 J/g*°C

Specific Heat capacity of steam = 2.108 J/g*°C

Heat of vaporization of water = 2260 J/g

H = (10 * 4.18 * (100 - 20)) + (10 * 2260) + (10 * 2.108 * (120 - 100))

H = 3344 + 22600 + 421.6

H = 26.36 kJ

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The  percentage abundance of Mass of N-14 is 99.6 % while the percentage abundance of N-15 is 0.4%.

We know that an element is composed of several isotopes. The isotopes of an element has the same atomic number but different mass numbers. The reason for the difference in the mass number of the elements is the fact that the elements do not have the same number of neutrons.

Now we have the following information;

Mass of  N-14 = 14.0031 amu

Mass of  N-15 = 15.001 amu

Atomic mass of nitrogen = 14.00674 amu

Let the percentage abundance of Mass of  N-14 be x and the percentage abundance of N-15 be 1 - x

We now have;

14.00674 =  14.0031x + 15.001(1 - x)

14.00674 =  14.0031x + 15.001 - 15.001x

14.00674 -  15.001 =  14.0031x - 15.001x

-0.9943 = -0.9979x

x = 0.996

Hence;

percentage abundance of Mass of  N-14 =0.996  or 99.6 %

percentage abundance of N-15 = 1 - 0.996 = 0.004 or 0.4%

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When the temperature of the liquid increases, the liquid will have greater kinetic energy, so they move about more and spread apart, This will cause the expansion of the liquid in the thermometer.

The kinetic theory of matter also known as particle theory of matter states that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.

The three states of matter include;

The distance between the molecule of each state of matter increases with increase in temperature.

The distance between the molecules of liquid is greater than that of solid while the distance between the gaseous molecules is the greatest.

Thus, when the temperature of the liquid increases, the liquid will have greater kinetic energy, so they move about more and spread apart, This will cause the expansion of the liquid in the thermometer.

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Option E) In the reaction A+ 2B-C that is found to be first order with respect to both a (0.200 m concentration and b (0.400 m concentration) the numeric value of k is 0.0875

Concentration in chemistry terms is calculated by dividing a constituent's abundance by the mixture's present total volume.

Mass concentration, molar concentration, number concentration, and volume concentration are four different categories that can be described in a mathematical description.

A + 2B → C

Rate = K [A] [B]

Here,

[A] = 0.2 M [B]

⇒ [A] = 0.4 M

rate = 0.007 M/s

Therefore, rate = K [A] [B]

⇒ 0.007 = K (0.2) (0.4)

⇒ K = 0.0875 M^(-1) S^(-1)

Thus, option E is correct.

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Complete question

The reaction A+ 2B-C is found to be first order with respect to both A and B. When the concentration of A is 0.200 M and the concentration of B is 0.400 M, the reaction rate is 0.00700 M/s. What is the numerical value of k for this reaction (with appropriate units where time is in seconds and concentration is in M, as needed).

A) 0.0438

B) 0.0140

C) 11.4

D) 5.60 x 10^(-4)

E) 0.0875

According to the density, there are m/0.895 milliliters in a drop of oleic acid and the total drop is 0.895/m of total volumes.

We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as

ρ = m / V

where ρ is density, m is mass and V is volume

From the question above, we know that

ρ = 0.895 g/mL

Assume that 1 drop of oleic acid is m gram. Hence,

ρ = m / Vdrop

0.895 = m / Vdrop

Vdrop = m/0.895 mL

Find the total drops

V = Vdrop x n

n = V / Vdrop

n = V / (m/0.895)

n = 0.895/m of total volumes

in a drop, there is m/0.895 mililiters of oleic acid and the total drop is 0.895/m of total volumes.

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The same sample of gas at different temperatures shows that at low

temperatures, most molecules have speeds close to their average

speed.

Put simply, a Maxwell-Boltzmann distribution graph shows how the energy of gas particles varies within a system.

This is solely a measurement of the speeds of particles because kinetic energy is directly related to speed.

The Maxwell-Boltzmann distribution in chemistry is the subject of this article.

We will begin by describing how to read a graph of the Maxwell-Boltzmann distribution. This will involve taking a closer look at things like the typical energy and the most likely energy.

The graph will then be changed under various circumstances, such as when a catalyst is added or the temperature is raised.

The Maxwell-Boltzmann distribution, which we previously mentioned, is a probability function that depicts the distribution of energy among the particles of an ideal gas. (For more information on this topic, see Chemical Kinetics.)

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A plot of the maxwell distribution of speeds for the same sample of gas at different temperatures shows that at low temperatures, most molecules have speeds close to their average speed.

The distribution of energy between identical but distinct particles is the subject of the Maxwell-Boltzmann distribution.

The distribution of speeds for gas at a specific temperature is specified by the Maxwell-Boltzmann equation, which is the foundation of the kinetic theory of gases.

The speed that is most likely to occur, the speed that is average, and the root-mean-square speed can all be calculated using this distribution function.

The number of molecules moving at a given speed is represented by the Maxwell-Boltzmann graph's y-axis.

Therefore, if the graph is higher in a certain area, it indicates that there are more gas molecules traveling at such speeds in that area.

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A chemical symbol is a notation of one or two letters representing a chemical element.

B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.

The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.

When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;

From the given chemical reaction;

2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr

Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.

Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.

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The total pressure of the mixture is 81.57 kPa

1. Write down all units given.

T= 296.15 k

337 mg CH4

148 mg Ar

210 mg of N2

PPN2= 19 kPa

2. Convert mg to g.

337 mg= 0.337 g CH4

148 mg= 0.148 g Ar

210 mg= 0.210 g N2

3. Calculate moles for each.

0.337/16.04= 0.021 mol CH4

0.148/39.948= 0.003 mol Ar

0.210/28.02= 0.007 mol N2

4. Calculate the mole fraction of N2. Xi= nN2/n total

0.007/0.021 + 0.003 + 0.007= 0.225

5. Remember that PPN2= xN2 x Total Pressure

19 kPA= 0.225x

6. Solve for x.

19/0.007=84.45 kPA

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An element with atomic number 119 will be an alkali metal with a +1 oxidation state which makes it highly electronegative.

This is described as the tendency of the atom of an element to attract electrons so as to form a bond. This is done so that the elements can achieve a stable octet configuration.

On the other hand, if an element with atomic number 119 was present based on it’s likely position on the periodic table then it will most likely be an alkali metal with a +1 oxidation state and will be highly electronegative as it requires the loss of only one electron in other to achieve a stable configuration thereby making it highly reactive.

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An acid is able to produce ions in the aqueous solution because polar H-A bond break due to the attraction between H atoms and the O atoms of water.

When an acid is added to an aqueous solution, it produces hydrogen ions along with a conjugate base.

After dissolving in water, an acid splits up to form hydrogen ions or H+ ions which reacts with water molecules to form hydronium ions i.e. H3O+. The general formula of an acid shows that is is composed of a halogen atom, oxygen atom and hydrogen atoms.

Let's take this, the dissociation of HNO3 produces h+ ions and NO3- ions in water.

HNO3      ⇄     H+ + NO3-

These ions are responsible for electricity conduction. In the absence of water acids can not dissociate.

To put it simply, acids donate h+ ions only when they are added to water.

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The observation that could be made by the students are; B, D, E

A mixture is composed of two or more substances that do not chemically react together. Elements are chemical substances that have independent existence. Elements are combined together to give compounds.

The three observations that the students could make are;

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Sub atomic particles are those particles which have the size smaller that the size of an atom. these are neutrons, electron and protons.

Mass number = neutrons + protons so in lithium 3+4=7

The number of protons present in an element is known as atomic number. This is denoted as Z. Different atom have different atomic number because they have different number of protons.

The sum of protons and neutrons give us the mass number. This is denoted as A. The weight of the of the electron can be neglected so atomic mass is almost equal to mass number.

In case of lithium its nucleus consist of 3 protons  and 4 neutrons so mass number = neutrons + protons ,3+4=7.

⁷₃Li this is the symbolic representation where above number is mass number and below number is the atomic number.

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The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g

A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.

Given data :

Heat energy liberated = 12,800 kJ

Δ Combustion = 891 kJ/mol

To calculate the mass of methane (CH₄) -

Number of moles of methane burned = Heat energy used

                                                                 Δ Combustion

Number of moles of methane burned = 12880

                                                                    891

Number of moles of methane burned = 14.455 mol

Since, Molar mass of methane is 16.043 g/mol

So, Mass of methane = Number of moles of x Molar mass of methane

                                          methane burned  

Mass of methane = 14.455 mol x 16.043 g/mol

Mass of methane = 231.9 g

Therefore, the mass of methane which must be burned is 231.9 g.

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Many everyday substances, such as oxygen, gold and aluminium, are element . but Other substances such as water and sugar are not

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The internal reaction temperature would be constant temperature in the Diels alder reactions, The temperature would be 25 ° C to 100° C.

Diels alder reaction : This reaction is used to make the chemical more stable. This reaction is used to synthesis of different materials such as plastics and rubber.

It is an exothermic reaction.

Xylene is used to faster the chemical reaction in the given process.

The product would be cyclohexane.

MP of the reaction is 84 °C to 114 ° C.

It is also a electrocyclic reaction.

In past it uses temperature around 200°C.

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Answer:

Magnifying glass or a special device that resembles a handheld microscope, used to observe ink placement of printers

Explanation:

The negatively charged atoms are known to show the electron affinity. Hydrogen is more reactive than oganesson based on electron affinity.

The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry.

Due to the difficulty in determining atoms' electron affinities, values are only known for a small number of chemical elements, primarily halogens.

Similar towards how chlorine can achieve the configuration of noble gases and become an electronegative ion, hydrogen has a high attraction for electrons, becoming the hydrogen anion and obtaining the stable configuration of helium.

The first synthetic element to belong to group 18 (the noble gases), oganesson has the potential to be substantially more reactive than the other members of that group.

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