For this discussion, you get to explore one specific element and share the historical context and modern day application of that element with the class. Your initial post should address the following questions about the element you chose:

1. How did the element you chose get its name and who discovered it?
2. What are the properties this element possesses that places it where it is in the periodic table?
3. Write a sufficient summary of the element in common language that could be understood by the general public.
4. Describe the implications for society, benefits, drawbacks, practicality, and reactivity of the element.
5. What are some applications and hazards of this element and how is it commonly encountered?
6. Discuss your personal thoughts regarding the element.
7. Questions to your classmates that invite discussion and further the dialogue.
8. An embedded picture that is relevant to the discussion.
9. Give a citation of an external peer reviewed resource that you would like to

Answer:

The Law of Conservation of Matter states that in a chemical reaction, matter is not created or destroyed. However, it is possible for the mass of a substance to change during a chemical reaction, as you observed.

When a substance burns, it reacts with oxygen in the air to form new compounds. For example, when wood burns, it reacts with oxygen to form water and carbon dioxide. The mass of the wood plus the mass of the oxygen is equal to the mass of the water and carbon dioxide produced.

In this case, the extra mass that you observed came from the oxygen that reacted with the wood. Oxygen has mass, and when it reacts with the wood, the mass of the resulting compounds is greater than the mass of the starting materials.

It's important to note that energy is not a form of matter, and therefore has no mass. However, energy can be converted into matter and vice versa, according to the famous equation E=mc^2, where E is energy, m is mass, and c is the speed of light. This equation demonstrates that mass and energy are fundamentally connected and can be converted into each other under certain conditions.

Explanation:

The vapor pressure at 49.5 °C is:

DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5

DP = 0.24 torr (approx)

The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.

The heat of vaporization (ΔHvap) and the normal boiling point (Tb) can be used to determine the vapor pressure of a liquid at a given temperature using the Clausius-Clapeyron equation. The Clausius-Clapeyron equation states that the change in vapor pressure (DP) with temperature (DT) is directly proportional to the heat of vaporization (ΔHvap) and inversely proportional to the absolute temperature (T) in kelvin.

DP/DT = ΔHvap / R * (1/T)

where R is the gas constant.

We can use this equation to solve for the vapor pressure of benzaldehyde at 49.5°C.

First, convert 49.5°C to kelvin:

T = 49.5°C + 273.15 = 322.65 K

Next, we need to use the Clausius-Clapeyron equation to solve for vapor pressure at a temperature T and the normal boiling point Tb:

DP/DT = ΔHvap / R * (1/T) = ΔHvap / R * (1/Tb - 1/T)

DP = ΔHvap / R * (1/Tb - 1/T) * DT

The vapor pressure at 49.5 °C is:

DP = 48.8 kJ/mol / 8.314 J/mol*K * (1/451.0 K - 1/322.65 K) * 49.5

DP = 0.24 torr (approx)

The vapor pressure of benzaldehyde at 49.5°C is approximately 0.24 torr.

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The vapor pressure of the benzaldehyde is  196 torr.

We know that the vapor pressure would have to do with the ease that we can use to convert the substance that is in question from liquid to gas. When we have two substances that are at different temperatures than we have;

ln(P2/P1) = -ΔH/R(1/T1 - 1/T2)

P2 = final pressure

P1 = initial pressure

R = gas constant

T1 = initial temperature

T2 = final temperature

Thus;

ln(P2/1) = -48.8* 10^3/8.314(1/451 - 1/322.5)

lnP2 = -5869.6(0.0022 - 0.0031)

lnP2 = 5.28

P2 =e^5.28

P2 = 196 torr

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The organic compound 3-hexanone can be prepared from ethylene using the second method given in the options.

3-hexanone is an organic compound classified to the ketones. Ketones are compounds with C=O group. 3-hexnone has the carbonyl group in the third carbon in the chain.

3- hexanone can be synthesized alkene sources by first converting them to alkynes. This process is oxidation. Ethylene can be oxidized to ethyne by treating with HBr and NaNH2 followed by hydrolysis.

The obtained higher alkyne or hexyne undergone acid hydrolysis in presence of sulphuric acid giving 3-hexanone.

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A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently. It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities.

Understanding why some fabrics are more durable and so more suited for particular uses comes from studying textiles. It permits one to comprehend the rationale behind why particular materials generate cool-looking clothing in addition to creating the sense of coolness when used as décor. A thorough understanding of clothing and textiles will enable one to evaluate standards and product brands intelligently.

It will also help one develop the capacity to recognize fabric quality, which will help one understand the best applications for the various qualities. Although clothes don't necessarily make a person, they certainly help to develop a positive personality and a sense of self-assurance. Housewives should therefore be familiar with clothing and textiles to obtain the best out of it.

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Salts are heated to extremely high temperatures during a display of fireworks. The salts' ions pick up energy and get excited. Exciting hues are created as energy in the form of light is emitted from the ions. Each salt's metal ion can be identified by the hue of the light that is emitted.

Subatomic particles refer to the three fundamental particles that make up the atom.

The subatomic particles include:

Electrons occupy several energy states. When electrons gain energy, they move to a higher energy state. The electrons on returning to a lower energy state emit radiation that is seen as several light color displays in fireworks.

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The molecular weight of MgCl₂ is 94 g/mol.

This refers to the total mass of a compound. It is equivalent to the sum of the individual atomic masses of each atom in the molecule.

Steps to determine the molecular formula of the molecule.

Atomic number of Cl =17

Atomic number of Mg = 12

Mass number of Cl = 35

Mass number of Mg = 24

Calculating the molecular weight of MgCl₂

MgCl₂

=(12* 2) + (35*2)

= 24 + 70

= 94 g/mol.

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All the EM waves travel at the same speed. The equation for speed is frequency (v) times the wavelength (λ). Speed of light equals 300000 km/s. Hence one number goes to 3 × 10⁸ m and other number is 1 s⁻¹.

Electromagnetic waves are waves moving without a medium through vacuum. They are accompanied with an electric field and magnetic field. The speed of an electromagnetic wave is the product its wavelength and frequency.

c = νλ

Therefore, the given passage can be filled as follows:

All the EM waves travel at the same speed. The equation for speed is frequency (v) times the wavelength (λ). Speed of light equals 300000 km/s. Hence one number goes to 3 × 10⁸ m and other number is 1 s⁻¹.

All EM waves are energetic.  The higher the frequency the more energy in the wave.

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Answer:

Electrons

Explanation:

"An electron is a negatively charged particle that orbits the nucleus of an atom."

"Electrons are negatively charged particles arranged in orbits around the nucleus of an atom"

Answer:

The formula for kinetic energy is KE= 1/2mv²

Explanation:

Hope it helps you

PLS RATE AS BRAINLIEST ANSWER

Mass percent of a compound=(mass of element in molecule/total mass of compound)×100  (a) 63.64%

We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.

In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:

(gE/gT) = %CE 100

Here, %CE stands for the element's composition in percent.

How to calculate the percentage of each element by mass makes up each compound?

To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.

Calculating total mass of HNO3

= 1 x 1 + 14 x 1 + 16 x 3

= 1 + 14 + 48

= 63

Calculating the mass percentage of Nitrogen in HNO3

= 1/63 x 100

= 1.586 %

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Answer:

entire, increasing, decreasing

Explanation:

The EM Spectrum is the entire range of EM waves in order of increasing frequency and decreasing wavelength.

Answer:

D

Explanation:

cause overall charge is +1 so will attract

Four magnets near an electromagnet What is the order of the magnets by strength from strongest to weakest. magnet W,magnet X,electromagnet,magnet Y,magnet Z.

What is electromagnet?

An electromagnet is a type of magnet in which the magnetic field is generated by an electric current. It usually consists of a coil of wire that is wrapped around a core of magnetic material such as iron or steel.

When an electric current passes through the wire, a magnetic field is created around the core, making it a magnet. Electromagnets are used in many different applications, such as motors, generators, and speakers.

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The buffer can be made using an acid or a base.

We have to know that the term buffer is the generic term that can be generally used to describe any solution that is resistant to changes in acidity and the alkalinity of the solution.

We know that we can be able to make a buffer in two ways;

1) By the use of a weak acid and its salt

2) By the use of weak base and its salt.

In each case, the pH of the solution that has been formed would not be easily changed and this is the job of the buffer.

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A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.

When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.

There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.

So we can conclude that a large population of resources will lead to more births.

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Answer:

Correct option is C)

Kinetic Energy at 20

o

C=293K

=3/2K

B

​

T=3/2K

B

​

(293)J=K.E

1

​

kE

2

​

=2K.E

1

​

2

2

3

​

K

^

B

​

(293)=

2

3

​

K

^

B

​

T

T=586K

=313

o

C

Magnesium is a metal that reacts quickly. The reaction with hydrochloric acid will result in the production of magnesium chloride and hydrogen gas.

Molecules, pressure, and temperature were necessary to determine the gas's volume. We only need to determine the moles of hydrogen because temperature and pressure have already been provided. As a result, 16.8 L of hydrogen were created at STP by dissolving 13.5 g of aluminum in sulfuric acid.

The chemistry is described below. According to the aforementioned reaction, 1 mole of magnesium and 2 moles of HCl are involved. The HCl moles are therefore 20.50mol=1mol 2 0.50 m o.

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There is no other feasible arrangement of “tetramethylbutane” it is redundant in this circumstance.

Tetramethylbutane, often known as hexamethylethane, is a hydrocarbon with the chemical formula C8H18 or (H3C-)3C-C(-CH3)3. It is the most branching and compact of the several octane isomers, as well as the only one having a butane (C4) backbone.

It has a highly symmetrical structure, a high melting point, and a narrow liquid range; in fact, it is the smallest saturated acyclic hydrocarbon that emerges as a solid at 25 °C. (Cubane, C8H8, is much smaller and solid at room temperature among cyclic hydrocarbons.) It is also the most stable C8H18 isomer, with a lower heat of formation of 4.18 kcal/mol (17.5 kJ/mol) than n-octane, which has been related to dispersive interactions (electron correlation) between the methyl groups (protobranching).

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Answer:

B. Chlorine gas is yellow-green in color.

For the given reaction, according to Le -Chatlier principle adding a catalyst will bring the reaction to the right. Removing the hydrogen gas shift  the equilibrium to the left and increasing pressure also shift to right.

According to this principle, when some a disorder is affecting the equilibrium of the system. The system balanced the factors which created the disorder and make  a new equilibrium.

A catalyst always helps to proceed the reaction in the forward direction. Thus adding a catalyst shift the equilibrium to the right.

If any  reactant or produced is removed from the system, the system shifts to the equilibrium to that direction in which they are producing. Removing hydrogen gas will then shift the reaction to the right to produce more hydrogen.

Increasing pressure shift the equilibrium to those direction in which the number of number of moles of gases decreases. Hence, the reaction shifts to the right here.

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The depression in freezing point of the electrolyte is 1.6 K. The weight of the solute added is 29.5 g. Then the molar mass of the compound is obtained to be 342.93 g/mol.

Addition of a non-volatile solute into a solvent decreases the freezing point of the solution. The depression in freezing point is calculated as follows:

ΔT =  W₂ 1000 Kf / (M W₁)

where W₂ be the mass of solute and W₁ is that of solvent, Kf is called molal depression constant. M be the molar mass of the solute.

Given ΔT = 1.6 K

W₂  = 29.5 g

W₁ = 100 g

Kf of water = 1.86 K/m

Then M = W₂ 1000 Kf / ( ΔT W₁)

M = 29.5 g× 1000 × 1.86 / (1.6 K × 100 g) = 342.9 g/mol

Thus, the molar mass of the solute is 342.9 g/mol.

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The electronic configuration which represents a transition element is 1s²2s²2p⁶3s²3p⁶4s²3d⁷

Transition elements are placed between the metallic S-block elements and nonmetallic P-block elements in the periodic table. They are D-block elements and have features similar to both metals and nonmetals, to some extent. This is why they are called transition elements.

One remarkable feature of these elements happens during the addition of electrons to them. Contrary to S and P-block elements, electrons are added to the penultimate shell, not the last shell. These elements often feature partially filled d-orbitals and have multiple oxidation states.

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Answer:

develops,blossoms are synonyms

Answer: S-block elements

Explanation: Elements of S-block are prepared through the electrolysis process not by the reduction of their compounds with the other group elements of their compounds. For example in Carbon dioxide carbon is non reducing because oxidation state of `C "in" CO_(2)` is `+4`, which is maximum So it does not undergo oxidation, and hence, it is not a reducing agent.

The number of oxygen atoms present in 2.0L of oxygen gas at same temperature and pressure is 5.1 × 10²² atoms.

The number of atoms of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).

no of atoms = no of moles × 6.02 × 10²³

According to this question, the density of oxygen gas at a certain temperature and pressure is 1.345 g cm-³. If 2.0 L of oxygen gas is given, the mass of the oxygen gas can be calculated as follows:

mass = 1.345 × 2 = 2.69grams

moles = 2.69g ÷ 32g/mol = 0.084moles

No of atoms = 0.084 mol × 6.02 × 10²³

no of atoms = 5.1 × 10²² atoms

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Answer:

To determine the volume of the solution in milliliters, we need to know the mass of CuNO3 and the concentration of the solution.

Given that 3.38g of CuNO3 is dissolved in water to make a 0.220 M solution, we can use the following formula to calculate the volume of the solution:

Volume = (Mass of CuNO3) / (Concentration of solution)

Plugging in the given values, we have:

Volume = (3.38 g) / (0.220 M)

Converting the mass to grams and the concentration to moles/liter, we have:

Volume = (3.38 g) / (0.220 mol/L)

Calculating, we find that the volume of the solution is approximately 15.36 liters.

To convert the volume to milliliters, we can multiply the volume in liters by 1000. In this case, the volume in milliliters is 15,360 ml.

Therefore, the volume of the solution in milliliters is approximately 15,360 ml.

Explanation:

Polyatomic ions are ions made up of more than one atom.

What are Atoms?

Atoms are the smallest particles of matter that make up all objects. They are composed of protons, neutrons, and electrons. Protons and neutrons make up the nucleus of the atom, while electrons orbit around the nucleus. Atoms are the basic units of matter and are the building blocks of all living and nonliving things.

Polyatomic ions are ions that consist of two or more atoms covalently bonded together and carrying a net electric charge. Examples of polyatomic ions include nitrate (NO3−), sulfate (SO42−), phosphate (PO43−), and carbonate (CO32−).

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Answer: adioisotopes, are species of chemical elements that are produced through the natural decay of atoms. Exposure to radiation generally is considered harmful to the human body, but radioisotopes are highly valuable in medicine, particularly in the diagnosis and treatment of disease.

Explanation:

The compound is going to have the molecular formula; [tex]C_{4} H_{8}O_{2}[/tex]

We know that the molecular formula is the formula of the compound that shows the number of the atoms of each of the elements that we can be able to find in the compound.

Now for the compound that we have, we divide through by the relative atomic mass of each;

C - 54.53/12    H -  9.15/1   O - 36.32/16

C - 4.5        H - 9.15    O - 2.27

Dividing through by the lowest ratio;

C - 4.5/2.27   H - 9.15/2.27     O - 2.27/2.27

C - 2   H - 4    O -1

The empirical formula is [tex]C_{2} H_{4} O[/tex]

We now have;

[2(12) + 4(1) + 16] n= 88.1

n = 88.1/44

n = 2

The molecular formula is;

[tex]C_{4} H_{8}O_{2}[/tex]

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