PLEASeee helppp in class rn. Pleaseee with 2,3, and 4.

Velocity = Frequency x Lambda

Assuming that this is referring to an electromagnetic wave. The velocity of light is 2.998 x 10^8 m/s.

Convert the wavelength from cm to m. So divide it by 100 and you get 5.4x10^-7 meters.

2.998 x 10^8 = 5.4 x 10^-7 (λ)

Solve for λ and you get 5.55 x 10^14 Hz

The frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.

Frequency can be defined as the number of oscillations of a wave in one second. The frequency of the wave has S.I. units which are per second or hertz.

Wavelength can be described as the distance between the two most adjacent points in phase with each other. Two adjacent crests or troughs on a wave are separated by a distance of a single wavelength.

The relationship between frequency, speed of light, and wavelength is:

c = νλ

Given, the wavelength of the wave, λ = 5.4 ×10⁻⁵ cm

Then the speed of the wave is speed of light, c = 3 ×10¹⁰ m/sc

The frequency of the waves can be calculated from the above mentioned relationship:

The frequency of the given wave will be equal to:

ν = c/λ = 3× 10¹⁰/5.4 ×10⁻⁵ = 5.55 ×10¹⁴ s⁻¹

Therefore, the frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.

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Explanation:

A. mole=mass/molar mass

Molar mass of NaCl=23+35.5g

NaCl=58.5g

from

mole=0.90/58.5mol

mole=0.90g/58.5mol

mole=0.15

B. concentration=number of moles of solute/volume of solution

concentration=0.15mol/250cm^3

1dm^3=1000cm^3

250=0.25

concentration=0.6mol/dm^3

To slow down that particular cellular activity by controlling the enzyme we wil decrease the temperature of the incubator where the cells are growing.

Anselme Payen was the first to discover an enzyme. A biological catalyst which alter the rate of the chemical reaction is known as Enzyme. It is not destroyed during the reaction and is used over and over. These are proteins made up of of amino acids linked together in one or more polypeptide chains.

We need to  decrease the temperature of the incubator where the cells are growing to slow down that particular cellular activity by controlling the enzyme.

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Aspects covered by Bohr's atomic model are : Electrons do not have energy, The energy is determined by the orbit.

Features of Bohr's atomic model are:

1) Electrons revolve around the nucleus in orbits .Each orbit has a definite energy called as energy shell or energy level. Energy of electrons is determine by the energy levels.

2) Orbits is designated as K, L, M, N shell.

3) When an electron jumps from a higher energy level to lower level it emits energy and when it jumps from lower to higher energy level it absorbs energy.

thus, Aspects covered by Bohr's atomic model are : Electrons do not have energy, The energy is determined by the orbit.

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Answer:

It’s the 1st option and 4th option.

Explanation:

Answer: Lower Left!

Explanation: I just took the quiz.

The given question is incomplete the complete question is  

The police have made a drug bust and confiscated a large quantity of suspected cocaine. The police bring a sample to you, a forensic chemist, for analysis. The chemical formula of cocaine is C17H21NO4. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol

Calculate the mystery compound’s empirical formula. Show full solutions.

The police have made a drug bust and confiscated a large quantity of suspected cocaine the police bring a sample to you, a forensic chemist, for analysis the chemical formula of cocaine is C₁₇H₂₁NO₄. After analyzing the mystery compound you find that it is 67.296% carbon,6.991% hydrogen, 4.618% nitrogen, and 21.095% oxygen. You also find that it has a molar mass of 303.35g/mol and the mystery compound is  C₁₇H₂₁NO₄  means cocaine

The cocaine is the local anesthetic and it is also used for to cause loss of feeling or numbness and drug is the any substances that is used to prevent, diagnose, treat and relieve symptoms of abnormal condition and drugs can also affect how the brain and the rest of the body work and cause changes in mood, awareness, thoughts, feelings, or behavior

Here given chemical formula of cocaine is C₁₇H₂₁NO₄ and in that carbon percentage is 67.296%  and hydrogen percentage is ,6.991%,  nitrogen percentage is 4.618%, and oxygen percentage is 21.095% and given molar mass is 303.35g/mol then

We have to find mystery compound’s empirical formula =?

So given mass/molar mass

Then we have to find mole ratio and number of moles so here 67.296% carbon then  67.296/303.35g/mol = 0.22g

6.991% hydrogen = 6.991/303.35g/mol = 0.023g

4.618% nitrogen = 4.618/303.35g/mol  = 0.015g

21.095% oxygen = 21.095/303.35g/mol = 0.069g

Mass of carbon/molar mass of carbon

67.296/12 = 5.6 mole

Mass of hydrogen/molar mass of hydrogen

6.991/1 = 6.9 mole

Mass of oxygen/molar mass of oxygen

21.095/16 = 1.3 mole

Mass of nitrogen/molar mass of nitrogen

4.618/14 = 0.32 mole

So now dividing the smallest mole then in that 0.32 is the smallest mole

5.6 mole carbon/0.32 mole = 17

6.9 mole hydrogen/0.32 mole = 21

1.3 mole of oxygen/0.32 mole = 4

0.32 mole of nitrogen/ 0.32 mole = 1

So the empirical formula is C = 17, H = 21, O = 4, N = 1

So, C₁₇H₂₁NO₄

And the mystery compound is C₁₇H₂₁NO₄

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If I was given a mixture of iron filings and sand, the explanation I would give to prove that it is a mixture is that I would show that they are a homogeneous mixture.

The procedure that I would give to show they are a mixture is by showing how they can be separated and this is through the use of a magnet.

This is because sand is non-magnetic and iron fillings can be used as magnets.

This refers to the material that contains two or more elements that are NOT chemically bonded.

Hence, we can see that the explanation of mixture is given below.

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The complete ionic equation Ca(OH)2 + HClO4 → H2O + Ca(ClO4)2.

A complete ion equation describes all ions dissociated in a chemical reaction. The net ion equation cancels out ions appearing on either side of the reaction arrow. This is because they do not inherently participate in the desired reaction. An annihilated ion is called a spectator ion.

The net ionic equation describes only the species participating in the reaction while the full ionic equation also includes the spectator ion. The net ion equation must be balanced by both mass and charge. Mass balance means ensuring that the mass of each element on the product side and the educt side is equal.

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In Bohr's Model of the atom, the option that is included  is option b, c and e:

As long as the energy of the photon was equal to the energy difference between the beginning and final energy levels, the Bohr model predicts that an electron would take in energy in the form of photons to be excited to a higher energy level.

The ground state, which describes the electrons when they are at their lowest energy, is typical. An atom's electrons can absorb energy by moving up to a higher energy level, or excited state, if they are supplied energy (via heat, electricity, as well as light, etc.).

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Answer:

That is it are you okay.

Explanation:

thank you

The statement that accurately contrast a compound and a mixture is; Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.

The term mixture has to do with a combination of two or more substances that are not chemically combined hence they can easily be separated by the use of physical methods. Hence they are not in any way compounds.

A compound is a substance that has been formed by the chemical combination of the atoms of elements. This implies that the components of a compound can not be separated by physical methods.

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The mass of sodium phosphate needed to make 375 mL (0.375 L) of a solution with a molarity of sodium ions of 0.900 M is 18.45 g.

Because each mole of sodium phosphate produces 3 moles of sodium ions upon dissociation, the molarity (c) of the sodium phosphate solution will be c = 0.900 M / 3

c = 0.300 M.

Now we can use the molarity and the volume of the solution (V) to find the required number of moles (n) of sodium phosphate.

c = n/V ⇒ n = c*V

n = 0.300 M * 0.375 L

n = 0.1125 mol

Finally, using the molar mass of sodium phosphate (M = 164 g/mol), we can calculate the mass (m) of sodium phosphate required:

n = m/M ⇒ m = n*M

m = 0.1125 mol * 164 g/mol

m = 18.45 g

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Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration.

Liquefied petroleum gas (LPG) is a fuel used in a variety of home appliances for heating, cooking, and producing hot water. Due to how simple it is to convert this gas to a liquid, it is known as liquefied gas. LPG can be converted from a gas to a liquid by applying low pressure or refrigeration. LPG is originally used for gas burners, cooktops, and ovens because these equipment, together with heaters, fireplaces, and gas hot water systems, are common in homes. Gas-powered dryers are also available.

Examples of outdoor gas equipment include fire pits, pizza ovens, patio heaters, rooftop fireplaces, and BBQs. Propylene, butane, isobutan butylenes,e, and combinations of these gases make up the majority of LPG.

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The zinc reacts with hydrochloric acid which produces hydrogen gas along with zinc chloride, and we determine the reaction because the hydrogen gas is formed.

We know that when the zinc reacts with the hydrochloric acid, then this reaction bubbles vigorously so hydrogen gas is produced. The production of hydrogen gas is also proof that a chemical reaction is occurring.

The zinc reacts quickly with the hydrochloric acid for the formation of zinc chloride and hydrogen gas. These reactions occur in a single displacement reaction where zinc metal displaces the hydrogen to form hydrogen gas and zinc chloride.

This reaction is an exothermic reaction that produces a big amount of heat. Zn + 2HCl → ZnCl₂ + H₂

So we can conclude that hydrogen gas and zinc chloride are formed when the zinc reacts with hydrochloric acid.

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Answer:

Toxic pollution

Explanation:

Gasoline is a harmful chemical

The densities of the substances are;

Aluminum bar = 2.6 g/ml

PE rod = 0.91 g/mL

Iron bolt =  5.65 g/mL

The term density is defined as the ratio of the mass to the volume of the object. We know that mass is an intrinsic property. This means that the density of the object can be used to identify what the object that is under study is. Let us now try to find the density of each of the objects.

In this case, we have the mass and the volumes of the objects as they have been shown in the table that have here. We can now be able to find the volume of each of the objects.

Density of aluminum bar = 39 g/ 15 g/mL = 2.6 g/ml

Density of the PE rod = 21 g/23 mL = 0.91 g/mL

Density of iron bolt = 39 g/6.9 mL = 5.65 g/mL

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Answer:

Atoms that contain an unstable combination of neutrons and protons, or excess energy in their nucleus.

Explanation:

cuz

Dietary fats include saturated fat. Along with trans fat, it is one of the harmful fats. Most of the time, these fats are solid at room temperature. High quantities of saturated fat are found in foods like butter, palm and coconut oils, cheese, and red meat.

Stearic acid, palmitic acid, myristic acid, and lauric acid are examples of typical dietary saturated fatty acids.

Each carbon molecule in saturated fat is bonded to hydrogen, or "saturated," as a result of which the molecules are stable when the fat is cooked. As a result, heat won't cause them to oxidize or go rancid. The finest fats to use while cooking at temperatures above 180°C are saturated fats.

Unsaturated fats, which are liquid at room temperature, are regarded as healthy fats because they have a range of positive effects on health, including lower blood cholesterol levels, less inflammation, stable cardiac rhythms, and more.

The more polyunsaturated a fat is, the quicker it will oxidize since unsaturated fats are more prone to oxidation than saturated fats. Due to the more brittle double bonds, which permit more oxygen to react at those sites, this has occurred.

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The solar panel would represent energy, so a solar panel would be one of them!

Studying cell illness models helps researchers better understand how diseases arise, which in turn helps them find novel molecular targets for particular therapeutics. Cell disease models can also be utilized to assess prospective therapeutic strategies. Thus, option C is correct.

The two-piece plant cell model depicts the normal plant cell's structures as seen through an electron microscope. The cytoplasm and all significant organelles are depicted in raised relief and colour on the plant cell. The plant cell model has the following features: cellular wall.

The process of generating a digital reproduction of each procedure, piece of machinery, and workflow within a plant is known as “plant modelling.”

Therefore, A solar panel would be one of them, since it would stand in for electricity.

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The atom belongs to a group two element and the atom is in period three since there are three shells.

The term electron configuration has to do with the way and manner in which the electrons in an atom are arranged. It is usual the there are two electrons that reside in the shell that is closest to the nucleus.

The other shells after this shell can hold a maximum of about eight electrons on the same shell until we arrive at the final shell of the atom. The element thus shown belongs to group two and period  because there are two electrons in the outermost shell and there are three shells present.

Hence, the element belongs to the alkaline earth metals.

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Answer:

Explanation:

cg c g cv

The choice that goes in the green box to cancel out mg is 10⁻³ gram. The correct option is B.

Conversion Factor: To convert from milligrams (mg) to grams (g), we use the conversion factor that 1 gram (g) is equal to 1000 milligrams (mg), or 1 g = 1000 mg.

To cancel out the unit "mg" and obtain the desired unit "g," we need to use the conversion factor with the appropriate power of 10. In this case, since we want to cancel out milligrams (mg), which is 10⁻³ times smaller than a gram (g), we use the factor 10⁻³ g/mg.

Therefore, by multiplying 43 mg by the conversion factor 10⁻³ g/mg, we can cancel out the milligram unit and find that there are 0.043 grams in 43 milligrams.

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Answer:

1.39 x 10^25 atoms

Explanation:

12 amu of C has 6.02 x 10^23 atoms

so 276.23 amu has

(276.23)(6.02 x 10^23)/(12) = 1.39 x 10^25 atoms

The correct sequence of subshells in the diagram from the shell with the lowest to the shell with the highest energy level is 1s>2s>2p. Option C.

According to Aufbau's principle, while writing electron configuration of elements, lower energy level orbitals are filled with electrons first before the higher energy level orbitals.

Thus, the order in which electrons will fill the different orbitals would be s, p, d, and f. In other words, the lower level s orbital will get filled first, followed by lower level p orbital, d orbital, and then f orbital.

Going by this principle, the correct sequence of subshells in order of their energy level is 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p.

Therefore, the correct sequence of subshells as represented in the diagram from the lowest to the highest energy level is 1s>2s>2p.

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E is standard the electrode potential of a reaction, increasing the value of K will Increase the forward reaction.

A measure of the reducing power of an element or compound. The IUPAC Gold Book defines it as Split the reaction into two half-reactions. where n is two. The following example shows how to use the Nernst equation to calculate the potential of an electrochemical cell under non-standard conditions.

If both half-reactions have different numbers of electrons multiply both equations by the appropriate number so that n is the same in both equations, then use this value of n in the equations before generating electricity. increase. The energy used is released during spontaneous chemical reactions. When the applied external potential is greater than the Ecell of the electrochemical cell, the reaction is reversed. It started working as an electrolytic cell and vice versa.

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Elements that can conduct electricity include metals. One of three classes of elements, they (the other two classes are nonmetals and metalloids). The largest of the three classes is by far metals.

Metals are all elements besides hydrogen that undergo chemical reactions and lose electrons to produce positive ions. Metals are electropositive elements as a result. They are distinguished by their brilliant brilliance, hardness, capacity for resonance, and excellence as heat- and electricity-conductors.

Brass, steel, aluminium, copper, silver, and other metals are frequently used as electrical conductors. Silver, copper, and gold are the metals that conduct electricity the best.

Among the physical characteristics used to separate the three groups are: A substance's capacity to reflect light is referred to as luster. The adjectives are often either metallic or non-metallic. The ability of a substance to carry electricity is referred to as conductivity. You might use a conductivity meter to test this.

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The law of conservation of mass states that "the mass of the reactants is equal to the mass of the products." This statement is accurate.Additionally, in a chemical equation, the number of atoms of different elements on the reactants side equals the number of atoms on the products side.

Which of the following statements is true of this reaction?

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The enthalpy of reaction for the solution of barium sulphate and sodium nitrate in a coffee cup calorimeter is 1170.4 J.

The enthalpy associated with a reaction is the heat absorbed or released by the reaction system. In a coffee cup calorimeter, the reaction enthalpy is equal to the heat change in the reaction system.

The reaction enthalpy is calculated as follows:

ΔH (rxn) = cmΔT, where c is specific heat capacity.

c for barium sulphate solution is 4.18 J/(g K) and weight is 200 with a temperature change if 23.5 degree Celsius (296.65 K) to 24.9 (298.05 K).

Apply these values to the equation above.

ΔH (rxn) = (4.18 J/(g K) × 200 g) ×(298.05-296.65)K = 1170.4 J.

Hence, enthalpy of the given reaction is 1170.4 J.

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The value of concentration of [tex]H^{+}[/tex] and [tex]OH^{-}[/tex]  of three solutions whose pH  is given are ,

( a ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.11 M and  7.28 × [tex]10^{-6}[/tex] M.

( b ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is  4.69 × [tex]10^{-6}[/tex] M and  0.177 M .

( c ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.002 M and  3.28 × [tex]10^{-4}[/tex] M .

( a )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  2.17

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 2.17

[  [tex]H^{+}[/tex] ]  = 0.11 M

pH + pOH = 14

pOH =   14 - pH =  14 -  2.17 = 11.83

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 11.83

[  [tex]OH^{-}[/tex] ]  = 7.28 × [tex]10^{-6}[/tex] M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.11 M and  7.28 × [tex]10^{-6}[/tex] M.

( b )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  5.96

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 12.27

[  [tex]H^{+}[/tex] ]  = 4.69 × [tex]10^{-6}[/tex] M

pH + pOH = 14

pOH =   14 - pH =  14 -  12.27= 1.73

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 1.73

[  [tex]OH^{-}[/tex] ]  = 0.177 M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 4.69 × [tex]10^{-6}[/tex] M and  0.177 M .

( c )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  5.96

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 5.96

[  [tex]H^{+}[/tex] ]  = 0.002 M

pH + pOH = 14

pOH =   14 - pH =  14 -  5.96 = 8.04

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 8.04

[  [tex]OH^{-}[/tex] ]  = 3.28 × [tex]10^{-4}[/tex] M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.002 M and  3.28 × [tex]10^{-4}[/tex] M .

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Answer:

Potassium has one electron in its valence shell(2,8,8,1) so during the reaction of potassium and fluorine that 1 electron is completely transferred to fluorine (by ionic bonding) which has 7 electrons in its outer shell(2,7). After getting an electron from potassium, it has 8 electrons in its outer shell which makes it more stable.Because Potassium lost 1 electron it is also stable as potassium now has 8 electrons in its outer shell.Potassium now has a +1 charge while fluorine has a -1 charge.

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The classification of the reactions are;

water → hydrogen + oxygen - decomposition

iron + oxygen → iron oxide - Oxidation

The term chemical reaction has to do with an interaction that occurs between the reactants and the products so that  new substance can be formed. This is how we know that a chemical change has occurred.

We are here to sort the reactions according to the kind of changes that they represent. Recall that we do have several kinds of reactions that do take place and they are classified based on the kind of changes that are taking place there.

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