What is the reason behind that the melting and boiling point of iron is more than that of sodium? Write any two differences between metalloids and alloys.​

If the pH of a solution is 7, the pOH of the solution will be 7.

The concentration of the hydroxide ion (OH-) in a solution is measured by pOH.

This is a fundamental equation to calculate the pH and pOH.

pOH = 14 - ph

The pH is given 7

Putting the value of pH in the formula

pOH = 14 - 7 = 7

Thus, the pOH will be 7, if the pH of a solution is 7.

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Answer:

[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].

Explanation:

Assume that the coefficient of [tex]{\rm LiOH}[/tex] is [tex]1[/tex]:

[tex]?\; {\rm Li} + ?\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].

The product side of this equation would include:

By the conservation of atoms, the reactant side of this equation should also include:

The only reactant that includes [tex]{\rm Li}[/tex] atoms is [tex]{\rm Li}\![/tex]. Thus, the coefficient of the reactant [tex]\!{\rm Li}[/tex] should be [tex]1[/tex] to ensure that the reactant side of this equation includes exactly [tex]1\![/tex] [tex]{\rm Li}\!\![/tex] atom.

Likewise, the only reactant that includes [tex]{\rm O}[/tex] atoms is [tex]{\rm H_{2}O}[/tex], with one [tex]{\rm O}\![/tex] atom in each formula unit of [tex]{\rm H_{2}O}\![/tex]. There needs to be [tex]1\![/tex] [tex]\!{\rm O}[/tex] atom on the reactant side of this equation. Therefore, the coefficient of the reactant [tex]{\rm H_{2}O}\!\![/tex] should also be [tex]1[/tex]:

[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + ?\; {\rm H_{2}}[/tex].

The reactant side of this equation now include:

By the conservation of atoms, the product side of this equation should also include:

The product [tex]1\; {\rm LiOH}[/tex] alone would account for [tex]1\; {\rm Li}[/tex] atom, [tex]1\; {\rm O}[/tex] atom, and [tex]1\; {\rm H}[/tex] atom. Thus, there would be only [tex]1[/tex] more [tex]{\rm H}[/tex] atom for the other product, [tex]{\rm H_{2}}[/tex]. However, since there are [tex]2[/tex] [tex]{\rm H}\![/tex] atoms in every formula unit of [tex]{\rm H_{2}}\![/tex], the coefficient of [tex]\!{\rm H_{2}}[/tex] would need to be [tex](1/2)[/tex]:

[tex]1\; {\rm Li} + 1\; {\rm H_{2} O} \to 1\; {\rm LiOH} + (1/2)\; {\rm H_{2}}[/tex].

Atoms of each element are indeed conserved in this equation.

Eliminate the fractions by multiplying all coefficients by [tex]2[/tex] (least common denominator of all coefficients in this equation):

[tex]2\; {\rm Li} + 2\; {\rm H_{2} O} \to 2\; {\rm LiOH} + 1\; {\rm H_{2}}[/tex].

The reaction is an unbalanced redox reaction hence, the reaction  can be balanced by using the half-reaction method.

The term redox reaction refers to the reactionnin which electrons are transferred hence one specie is oxidized while the other specie is reduced.

Looking at the reation as shown, we can see that the reaction is an unbalanced redox reaction hence, the reaction  can be balanced by using the half-reaction method.

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Answer:

B

Explanation:

Answer:

yes

Explanation:

math is used constantly to improve one's performance. Achieving the objective of shooting a basketball includes using percentages and angles. By finding the most consistent percentage of shots made while using a certain angle, you can find out which player will score the most baskets.

Answer:

Chemistry plays a large role in obstetrics and gynecology. For instance, urinalysis requires an understanding of bilirubin levels and their conjugation with glucuronic acid to create a compound that is water soluble. This is passed through the blood stream and urinary system to create urobilirubin.

Explanation:

Answer: A

Explanation:

A food web is just a bigger picture idea and more complex version of a food chain.

Answer:

a. many food chains linked together

Explanation:

A food web consists of all the food chains in a single ecosystem. Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem.

Answer:

ALPHA

Explanation:

Answer:

The process of obtaining metals from their ores is called metallurgy . The process employed in getting the ore depends on the nature of the ore and the impurities present in it.

The ore in which they are found depends on their reactivity. For example,reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide

I answered all of them except 2 for you to do

Hope this helps :))

The concentration can be expressed as the quotient between the masses.

We define the concentration (of something) in a solution, as the amount of that thing that there is in the solution.

With that in mind, the concentration can be defined by the quotient between the mass of the particular thing and the mass of the solution.

For example, in a mix of water and salt, the concentration of salt would be given by the quotient between the mass of salt and the total mass of the mix.

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Explanation:

The sublevel would have electrons with the highest energy is 4p. Therefore, option D is correct.

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, are typically regarded to be elementary particles.

The smallest elemental component of an atom, the electron has a negative charge. In a neutral atom, there are an equal number of protons and electrons. One electron and one proton are all that the hydrogen atom has.

The words electric and ion are combined to form the word electron. In turn, electron is derived from the suffix -on, which is currently used to describe other subatomic particles, such as a proton or neutron.

Thus, option D is correct.

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Answer:

- 65 kJ

Explanation:

Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

A+2B   +   B + 2C   ===>   C +D   + 2C+ D

   -20kJ      -45 kJ  ===>   3C + 2D

-65 kJ

Answer:

Global warming is a gradual increase in the earth's temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.

Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.

Since the pre-industrial period, human activities are estimated to possess increased Earth’s global average temperature by about 1 degree Centigrade (1.8 degrees Fahrenheit), variety that's currently increasing by 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. Most of the present warming trend is extremely likely (greater than 95 percent probability) the results of act since the 1950s and is proceeding at an unprecedented rate over decades to millennia.

Climate change may be a long-term change within the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

Global warming occurs when CO2 and other air pollutants and greenhouse gases collect within the atmosphere and absorb sunlight and radiation that have bounced off the earth’s surface.

Normally, this radiation would escape into space — but these pollutants, which may last for years to centuries within the atmosphere, trap the warmth and cause the earth to urge hotter. That's what's referred to as the atmospheric phenomenon.

Melting glaciers, early snowmelt, and severe droughts will cause more dramatic water shortages and increase the danger of wildfires. Rising sea levels will cause coastal flooding on the Eastern Seaboard, especially in Florida, and in other areas.

Forests, farms, and cities will face troublesome new pests, heat waves, heavy downpours, and increased flooding. All those factors will damage or destroy agriculture and fisheries. Disruption of habitats like coral reefs and Alpine meadows could drive many plant and animal species to extinction.

~ extracted from Global warming documentary.

Climate change encompasses not only rising average temperatures but also extreme weather events, shifting wildlife populations and habitats, rising seas, and a variety of other impacts. All of these changes are emerging as humans still add heat-trapping greenhouse gases to the atmosphere, changing the rhythms of climate that each one living things have come to believe.

There is a concentration of smelters, refineries, and foundries close to northern Belgium's copper mines because copper production is a bulk-reducing industry.

A bulk-reducing industry can be defined as a type of industry in which the raw materials (inputs) that are used for production weighs more than the finished good or final product.

This ultimately implies that, a bulk-reducing industry such as copper mines are established close to smelters, refineries, and foundries  because they make use of raw materials that weigh more than the finished good or final product.

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Answer:

I think the answer would be C because energy is only transferred.

Explanation:

Hope this helps:)....if it's wrong then sorry for wasting your time and may God bless you:)

Explanation:

This is not accurate because you cannot hear sound in space, you would most likely hear a giant explosion since that is what is happening in the movie I guess, they just added the sound to make the movie more appealing to watch, this isn't really what would happen in space. if anything you would just see the explosion and not be able to hear it at all. SOUND DOESNT TRAVEL IN SPACE.

In Beaker A, 2.0 grams of zinc powder is mixed with 1.0 M HCl acid & in Beaker B, 2.0 grams of zinc powder is mixed with 6.0 M HCl acid so in beaker B reaction occur faster.

Rate of reaction of any chemical reaction gives idea about the speed of the completion of the given reaction, and rate of reaction is directly proportional to the concentration of the reactant species.

If the concentration of reactants increases then the rate of the reaction also increases. According to the question concentration of zinc powder is same in both beakers.

In beaker A, concentration of HCl is 1M and in Beaker B is 6M respectively so the rate of reaction is faster in beaker B.

Hence in beaker B reaction occur faster.

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Answer:

I think that this would be an example of erosion

Answer:

they are more likely to get sick from the same disease

Black-footed ferrets are the most endangered mammal of North America. The problem that most black-footed ferrets today are closely related because they are more likely to get sick from the same diseases.

An endangered species are the species that can become extinct in the future, either worldwide.

The problem of the  black-footed ferrets today are closely related is that they are more likely to get sick from the same diseases.

Thus, the correct option is C.

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Answer:

10g

Explanation:

The fission reaction released the most energy per amu when compared to the fusion reaction.

The amount of energy released per amu for fusion is given as 0.36 J/amu.

The amount of energy released per amu for fission is given as 0.85106383 J/amu.

From the different energy released per amu, it is obvious that  0.85106383 J/amu is greater than 0.36 J/amu.

Thus, the fission reaction released the most energy per amu when compared to the fusion reaction.

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Answer:

i cant see the photo but i would love to help

Explanation:

Answer:

5=D

6=B

7=A

8=?????

1A= conduction

1B= radiation

1C= convection

3: C

4: A

Explanation:

2: The heat from the hot water is been transferred along the metal handle to the other end of the spoon by the process of CONDUCTION.

When the adhesin gene of Neisseria gonorrhoeae were mutated, the pathogen will be unable to attach to the host cells.

Pathogens may be defined as disease-causing agents. These are mostly microorganisms that infect the body of animals as well as humans.

Adhesin gene plays a very vital role in the attachment of pathogens to the host cells. It is the site where pathogen attack and attaches to host cells and then enters the body to play their function i.e. replication, a decline in the host immune system, and finally disease caused.

Therefore, when the adhesin gene of Neisseria gonorrhoeae were mutated, the pathogen will be unable to attach to the host cells.

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Answer:    Answer:

21.03L

Explanation:

V1 = 456mL = 0.456L

T1 = 23°C = (23 + 273.15)K = 296.15K

P1 = 50atm

V2 = ?

T2 = 273.15K

P2 = 1.0atm

Note : P2 and T2 are at STP which are 1.0atm and 273.15K

To find V2, we have to use the combined gas equation,

(P1 × V1) / T1 = (P2 × V2) / T2

P1 × V1 × T2 = P2 × V2 × T1

V2 = (P1 × V1 × T2) / (P2 × T1)

V2 = (50 × 0.456 × 273.15) / (1.0 × 296.15)

V2 = 6227.82 / 296.15

V2 = 21.029L

Final volume of the gas is 21.03L

Explanation:

Answer:

The pressure exerted by 66.0 g of CO₂ gas at -14.5°C that occupies a volume of 50.0 L is 0.636 atm.

How do we calculate pressure?

Pressure of any gas will be calculated by using the ideal gas equation as:

PV = nRT, where

P = pressure of gas = ?

V = volume of gas = 50L

R = universal gas constant = 0.082 L.atm/K.mol

T = temperature of gas = -14.5°C = 258.65 K

n is moles of gas and it will be calculated as:

n = W/M, where

W = given mass of CO₂ = 66g

M = molar mass of CO₂ = 44 g/mol

n = 66/44 = 1.5 moles

On putting values we get

P = (1.5)(0.082)(258.65) / (50)

P = 0.636 atm

Hence required pressure is 0.636 atm.

Explanation:

Hope This Helps

Have A Great Day

~Zero~

Answer:12 cm^3 becoz as per Gay-Lussac law

H2+Cl2---. 2HCl thus ratio is 1:1:2

Explanation:

The volume of hydrogen gas that combines with 12 cm³ of chlorine gas to form hydrogen chloride is 12 cm³.

To calculate the volume of hydrogen gas that combines with 12 cm³ of chlorine gas to form hydrogen chloride, we need to determine the stoichiometric ratio of the reactants based on their balanced chemical equation. The balanced equation for the formation of hydrogen chloride (HCl) is:

H₂ + Cl₂ → 2HCl

From the balanced equation, we can see that one molecule of hydrogen gas (H₂) reacts with one molecule of chlorine gas (Cl₂) to form two molecules of hydrogen chloride (2HCl).

Given that the volume of chlorine gas is 12 cm³, the volume of hydrogen gas required to react with it can be calculated as follows:

Volume of hydrogen gas = (Volume of chlorine gas) / (Stoichiometric ratio of hydrogen in the balanced equation)

Volume of hydrogen gas = 12 cm³ / 1 = 12 cm³

Therefore, the volume of hydrogen gas that combines with 12 cm³ of chlorine gas to form hydrogen chloride is 12 cm³.

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