what is the electron arrangement for the 14th element in the periodic table?

Answer:

C

Explanation:

the answer is C, hope this helps

The pair in which former is stronger nucleophile than later in polar aprotic solvent is CH₃NH₂ and (CH₃)₂NH. The correct option is A.

Nucleophiles are molecules that have a pair of electrons that can be shared. They are also called electron rich species.

Polar aprotic solvents are incapable of forming hydrogen bonds with the substrate. They don't have any hydrogen atoms directly connected to an electronegative atom, so they can't form a hydrogen bond.

Acetone, chloroform, dichloromethane, and other aprotic solvents are examples.

Thus, the correct option is  A. CH₃NH₂ and (CH₃)₂NH.

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Answer:

because battery have it's own voltage in it's composition

NiCO₃, which is nickel(II) carbonate, has a Ksp of 1.42 x 10⁻⁷. Determine the compound's molar solubility, S. NiCO₃(s) + Ni₂₊ + CO₃²⁻(aq) chemical reaction. Ksp = 1.42·10⁻⁷.

The equilibrium constant for a solid material dissolving in an aqueous solution is the solubility product constant, Ksp. It stands for the degree of solute dissolution in solution. A substance's Ksp value increases with how soluble it is.

NiCO₃, the nickel(II) carbonate, has the following Ksp expression:

Ksp = [Ni₂₊][CO₃²⁻]

where [Ni₂₊] and [CO₃²⁻] are the concentrations of nickel and carbonate ions, respectively, in the solution.

Fe(OH)₂, the iron(II) hydroxide, has the following Ksp expression:

Ksp = [Fe₂₊][OH⁻]²

where [Fe₂₊] denotes the amount of iron(II) ions in the solution and [OH⁻] denotes the amount of hydroxide ions in the solution.

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Answer:

Compounds containing two elements (binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.

Answer:

chalk bubbles with vinegar

Taking into account the definition of pH and pOH, the solution has a pOH of 6.92 and a pH of 7.08.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

A solution has an [OH⁻] concentration of 1.20×10⁻⁷ M. Replacing in the definition of pOH:

pOH= - log (1.20×10⁻⁷ M)

Solving

pOH= 6.92

Then, pH is calculated as:

pH + 6.92= 14

pH= 14 - 6.92

pH= 7.08

Finally, the solution has a pOH of 6.92 and a pH of 7.08.

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Answer: I think this one is the boiling water

sorry if wrong

Explanation:

In an at-home lab, the best course of action to take in the event that a chemical gets in your eye is to flush your eye with a clean water source.

An eye wash station is an emergency device used to provide immediate and sustained irrigation to the eyes in the event of a hazardous material splash or other accident involving the eyes. It consists of a bowl or basin of potable water connected to a pressurized water source, often with an adjustable flow-control device. Eye wash stations are designed to allow for the user to tilt their head back and irrigate both eyes at the same time, usually for a period of 15 minutes. This is necessary in order to remove hazardous material from the eye before it can cause damage. Eye wash stations should be installed in areas where hazardous materials are handled, stored, or used, as well as areas where workers may be exposed to hazardous materials. They should also be clearly marked and easily accessible in case of an emergency.

This can be done by holding your eye open and running clean water over it for at least 15 minutes. This will help to flush out the chemical and reduce the risk of eye damage. Additionally, it is important to seek medical attention as soon as possible after flushing your eye to ensure that the chemical did not cause any further damage.

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The scientific question related to the game of basketball is option D: "Do teams that practice more win more games?"

This question is scientific because it explores a cause-and-effect relationship between practice and game outcomes. It can be investigated through empirical observation and data analysis.

To answer this question, researchers could collect data on the practice hours of different basketball teams and compare them to their corresponding game performance. Statistical analysis could be used to determine if there is a correlation between practice time and winning percentage or other performance metrics.

By examining a large sample of teams over an extended period, researchers could draw conclusions about the impact of practice on game outcomes. This scientific inquiry would contribute to the understanding of the factors that influence team success in basketball and could potentially inform training strategies and coaching techniques.

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The description of the copper sulphate is mentioned below.

What is Copper Sulfate?

Copper sulfate can seriously irritate the eyes. It is also used as an antibacterial and molluscicide. Consuming excessive amounts of copper sulfate can cause nausea, vomiting, and harm to the liver, kidneys, blood cells, and other body parts. Shock and even death might result from excessive exposures.

What is minerals?

A naturally occurring inorganic substance or element with an. crystal form, physical properties, and characteristic chemical composition with an ordered internal structure. Rocks are naturally occurring solids made up of one or more minerals, whereas minerals are different.

Therefore, description of the copper sulphate is mentioned above.

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Answer:

.385 atm .

Explanation:

pressure of a gas is proportional to absolute temperature .

P ∝ T

P₁ / P₂ = T₁ / T₂

Given P₁ = .47 atm , T₁ = 60 + 273 = 333

P₂ = ? , T₂ = 273 K

.47 / P₂ = 333 / 273

P₂ = .385 atm .

Answer:

Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.

Explanation:

Answer:

Mg(NO₃)₂ · 4 H₂O

Explanation:

To find the formula of the hydrate, you need to (1) determine the mass of each compound, then (2) convert the mass of each compound to moles (via their molar masses), then (3) determine the lowest coefficient for each compound, and then (4) construct the formula.

(Step 1)

Because the percents add up to 100%, we can assume that the percent of each compound is equal to the mass (g) of each compound.

67.3% Mg(NO₃)₂ = 67.3 g Mg(NO₃)₂

32.7% H₂O = 32.7 g H₂O

(Step 2)

Molar Mass (Mg(NO₃)₂): 24.305 g/mol + 2(14.007 g/mol) + 6(15.998 g/mol)

Molar Mass (Mg(NO₃)₂): 148.307 g/mol

Molar Mass (H₂O): 2(1.008 g/mol) + 15.998 g/mol

Molar Mass (H₂O): 18.014 g/mol

67.3 g Mg(NO₃)₂            1 mole
--------------------------  x  ------------------  =  0.454 mole Mg(NO₃)₂
                                      148.307 g

32.7 g H₂O             1 mole
-------------------  x  -----------------  =  1.82 mole H₂O
                              18.014 g

(Step 3)

The moles of Mg(NO₃)₂ is the lowest among the two. To translate the technical amount of moles to the moles in the formula, you need to divide each value by the lowest mole value.

0.454 mole Mg(NO₃)₂ / 0.454 mole  =  1 mole Mg(NO₃)₂

1.82 mole H₂O / 0.454 mole  =  4 moles H₂O

(Step 4)

The amount of moles calculated in the last step represent the coefficient in front of the compounds. Using them, you can construct your hydrate.

Mg(NO₃)₂ · 4 H₂O

Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

\(HCl +NaOH \longrightarrow H_2O +NaCl\)

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

The pressure exerted by 200 g of Ar in a rigid 4.50 L container at 21.0 ˚ C would be 19.6 atm.

To calculate the pressure exerted by the Argon gas, we can use the ideal gas law:

PV = nRT

where

First, we need to determine the number of moles of Argon gas present:

Next, we convert the volume and temperature:

Now we can substitute the values into the ideal gas law and solve for P:

In other words, the pressure exerted by 200 g of Argon gas in a 4.50 L container at 21.0 ˚C is 19.6 atm.

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Answer:

Lattice energy is an estimate of the bond strength in ionic compounds. It is defined as the heat of formation for ions of opposite charge in the gas phase to combine into an ionic solid.

Explanation:

Answer:

This shifts the star's spectral lines toward the red end of the spectrum. The greater the shift from the normal position of the lines, the faster the star is moving.

Explanation:

By drilling several cores miles apart , geologist can correlate the rock units and create an image what exists and where below the surface.

Combining this information with rocks exposed to the surface , which can gives clues about rock orientation below, can be a powerful tool to locating oil and gas .

The determination of the location and the location of the sites should be explained below.

Natural gases refer to the gases that are found deep underground. These gases have been created via billions of years by organisms that have released natural gases. Natural gas could be obtained by drilling into a particular ground. Scientists could measured specific locations of natural gases in various methods. Many natural gas sites are located in the United Arab Emirates area.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

A mixture’s components can be separated by the technique of Chromatography.

It is widely used in various fields including forensics, chemistry, biology, and medicine. Chromatography works by taking advantage of different components within a sample and utilizing the differences in their behavior, such as their interactions with a chromatography column.

The most common type of chromatography is based on the principle of selective adsorption, in which components of the mixture bind to the stationary phase material, and move at different speeds when a mobile phase is added. The technique works by allowing components to separate based on their individual interactions with the surfaces of the chromatography column.

In general, chromatography is a useful technique for analyzing mixtures of organic compounds in a sample. This is done by separating the compounds in order of their relative solubility in different solvents. The solubility of each solvent is used to select proper temperatures for the chromatography process.

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Answer:

Explanation:

relation between energy wavelength and frequency.....

we know that energy of photon is

E=hf  but

v=fλ

f=v/λ when v=c(speed of light) then f=c/λ

putting the value of f in the equation of photon

E=hc/λ this equation gave a relation between wavelength frequency and energy in electromagnetic  waves

among electromagnetic waves UV rays are most dangerous because exposure to these radiation cause serious problems in living organism

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The relation that we use in case of electromagnetic wave is E=hc/λ

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hc/λ

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

c is speed of light that is 3×10⁸m/s

λ  is the wavelength of electromagnetic wave

Thus the relation that we use to find the energy of electromangetic wave is E=hc/λ

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The Pco₂ in the systemic venous blood will rise if the Pco₂ in the tissues rises.

According to Dalton's law, which is also known as the law of partial pressure, each gas in the air contributes a different amount to the overall atmospheric pressure depending on how much of the total volume it makes up.

Gas A will diffuse more quickly than gas B if the two gases have the same partial pressure but gas A has a higher water solubility coefficient than gas B.

According to Henry's law, a gas's solubility coefficient and partial pressure determine how much of it dissolves in water.

Gas B will diffuse into the blood more quickly if gas A's alveolar partial pressure is 110 mm Hg and gas B's partial pressure is 135 mm Hg.

According to Boyle's law, a gas's volume at a constant temperature is inversely proportional to its pressure.

The Pco₂ in the systemic venous blood will rise if the Pco₂ in the tissues rises.

Henry's law: This law describes the dissolution of gases in liquids. According to this, the amount of gas dissolved in a liquid depends on the gas's solubility coefficient and partial pressure above the liquid.

Boyle's law: This rule explains how a gas's volume and pressure are related. According to this law, the volume of a gas is inversely proportional to its pressure if the temperature stays constant.

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A, B, and C take the least amount of energy to disassemble from least to greatest amount.

There are lots of molecules in matter. Most of the oceans and atmosphere are also made up of them. The majority of organic compounds are molecules. Molecules such as proteins, the amino acids that make them up, nucleic acids (DNA and RNA), sugars, carbohydrates, lipids, and vitamins are examples of the constituents of life.

The following are listed in order of how much energy each one needs to break the carbon-carbon bond:

A. C2H2: C = H

B. C₂H4: H

H/

C=C

C. C₂H6: H H

H

H-C-C-H

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Answer:

A covalent bond involves two nonmetals that share electrons.

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option A that is a covalent bond involves two nonmetals that share electrons.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. A covalent bond involves two nonmetals that share electrons.

Therefore, the correct option is option A that is a covalent bond involves two nonmetals that share electrons.

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Answer:

itd be B because the melting point is 29.76 no matter the size

Explanation: