Can anyone please explain to me how that works?

Answer: The mass of KOH needed is 28 grams

Explanation:

Molarity: It is defined as the number of moles of solute present in one liter of solution.

In this question, the solute is KOH.

The formula used: M = N/V

wb = mass of solute KOH = ?

mb = molar mass of solute KOH = 56 g/mole

V = volume of solution = 250 ml

Molarity = 2.00 M = 2.00 mole/L

Now put all the given values in the above formula, and we get the mass of KOH.

Now put all the given values in the above formula, and we get the mass of KOH.

Therefore, the mass of KOH needed is 28 grams.

Answer: 28 grams

Explanation:  

2molarity/L= Mass of KOH/ 56g/molarity multiplied by 250ml multiplied by 1000 *Hope it helped*

The correct reactant that matches the equation is c)C₇H₆.

The missing reactant for the combustion reaction is C₇H₆. The complete reaction would be

2C₇H₆ + 1502 →14CO2+ 6H₂O.

C7H6 is a hydrocarbon molecule. The name of this molecule is heptendiin

If heptendiin is heated in the presence of oxygen, it will undergo combustion to form carbon dioxide and water vapor. When heptendiin is burned in air, the products of combustion are carbon dioxide and water vapor.

The combustion of this compound is a exothermic reaction, meaning that it releases heat on burning to give out Carbon-di-oxide and Water.

When 2 moles of C₇H₆ reacts with 15 moles of Oxygen, it gives 14 moles of Carbon-di-oxide and 6moles of water molecule.

Therefore the missing reactant, that gives out water and carbon-di-oxide is C₇H₆. Hence, the correct option is c)

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Answer: Glass or plastic

Explanation:

Because they both are able to shatter hehehhe ;)))))))

In a binary power system the secondary fluid that turns into vapor to drive the turbine has a lower boiling point

Binary cycles power plant operate on water at lower temprature of about 225-360°F and binary cycles plant use the heat from hot water to boil a working fluid and usually an organic compound with low boiling point and the working fluid is vaporized in a heat exchanger and used to turn a turbine and heat from geothermal fluid causes the secondary fluid to flash to vapor and which then drives the turbines and subsequently the generator

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Answer:

2

Explanation:

Answer:

Because it is a highly reactive group 1 metal and would react with the water, but not with oil.

Answer:

mostly due to heat or any outside substance for example if u add radio waves to heat you can get plasma or if u melt ice u get water witch is a solid turning into liquid

The initial temperature of the helium gas at a constant pressure is 113.63K.

The temperature of an ideal gas can be calculated using the Charles law equation as follows;

V₁/T₁ = V₂T₂

Where;

According to this question, three moles of helium gas have a volume of 15.0 L. When heated to 30.0 °C at constant pressure, it has a volume of 40.0 L. The initial temperature cane be calculated as follows:

15/T = 40/303

40T = 4545

T = 113.63K

Therefore, 113.63K is the initial temperature of the helium gas.

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Answer:

because if put in kerosene oil it will float and react with air

Halon is a gaseous agent which contains a mixture of carbon and one or more elements from the halogen series.

Halons are from the group of halocarbons. Halons are substances made of bromine, fluorine, and carbon. Extinguishers and other firefighting apparatus use them. Halons are electrically nonconducting substances that can be used to put out fires in flammable liquids and most solid combustible materials, including those found in electrical equipment. They are ineffective against fires caused by fuels that contain their own oxidizing agent or by highly reactive metals like sodium or potassium.

Halon 1301, also known as bromotrifluoromethane, is particularly preferred for putting out fires involving electronic equipment because it leaves no residue, doesn't result in electrical short connections, and won't harm the device's corrosion.

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Isotopes have the same atomic number but a different atomic mass. Isotopes of an element carry a different number of neutrons.

Isotopes can be described as atoms of an element that have the same atomic number but a different mass number. Isotopes of an element contain the same number of electrons and protons as the actual element. but the number of neutrons are different in their respective nucleus.

For example, the isotopes of oxygen element are oxygen-16, oxygen-17, and oxygen-18 they all have 8 electrons or protons. As the number of neutrons in oxygen increases by one, it forms a new isotope of oxygen.

As for the isotope, the number of electrons in the isotope of any element is the same.  Therefore, isotopes of any element carry the same atomic number but a different mass number.

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According to the research, the correct answer is solidification and condensation. These processes that decrease the motion of particles.

Solidification refers to the state that can be produced by the compression of the matter in question or by a drop in temperature, decreasing the kinetic energy of the particles, favoring the appearance of cohesive forces between them.

In this sense, condensation is the process of transforming a gaseous body into a liquid, by decreasing the temperature, decreasing the energy contained in the gas particles, therefore their motion.

Therefore, we can conclude that solidification and condensation are processes that imply a decrease in temperature and therefore decreases the motion of particles by losing energy.

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Chemical species are broken down into more basic components in decomposition processes. Energy input is often required for decomposition reactions. The mass of the CO2 gas that escaped  = 10.99 g.

What is a decomposition reaction?
Chemical species are broken down into more basic components in decomposition processes. Energy input is often required for decomposition reactions.

A decomposition reaction occurs when one reactant disintegrates into two or more products. The following general equation represents this: AB A + B. Both the decomposition of water into hydrogen and oxygen and the breakdown of hydrogen peroxide into water and oxygen are examples of decomposition reactions.

A decomposition reaction occurs when one reactant disintegrates into two or more products. It is represented by the all-inclusive formula AB A + B. A and B are the reaction products in this equation, while AB stands for the reactant that starts the reaction.

Molecular mass of CaO = 56.07 g

                             CO  = 44.01 g

the mass of the CO2 gas that escaped  = 13.9 x 44.01/ 56.07

                           = 10.99 g.

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The concentration of sodium ions in 0.130 M Na₂HPO₄  is 0.26 M.

The Na₂HPO₄ will dissociates in to ions we get :

Na₂HPO₄  ---->  2Na⁺   +  HPO₄⁻

here from the above equation it is clear that,the  1 moles of Na₂HPO₄ produce the 2 moles of Na⁺  and 1 mole of Na₂HPO₄  will produce 1 mole of  HPO₄⁻.

the concentration of Na⁺ = ?

concentration of the Na⁺ = 2 × Na₂HPO₄

concentration of the Na⁺ = 2 × 0.130 M

the concentration of the Na⁺ = 0.26 M    

Thus,  The concentration of sodium ions in 0.130 M Na₂HPO₄  is 0.26 M.

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The periodic table's metal group 11, which includes sodium, is where you may find this element.

When newly prepared, polished, or shattered, a metal exhibits a shiny look and quite good electrical and thermal conductivity. Typically, metals are malleable and ductile. The metallic link formed by the atoms and molecules of a metal gives rise to these characteristics. Any of the many glossy, opaque, fusible, ductile materials that really are good conductors of heat and electricity, make cations by the loss of electrons, and produce basic oxides & hydroxides. in particular: one that belongs to a chemical substance as opposed to an alloy.

Lead, aluminum, copper, zinc, and brass are a few examples. According to the periodic table, metals can be categorized according to their atomic structure. Alkaline, transitional, or alkaline earth metals are several types of metal. Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as malleability, ductility, and high light reflection.

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Long repeating units are used to create several natural and manmade materials. they most appropriately referred to as O Links and chains (left) and O Molecules (right)? (left).

A molecule comprised of repeating units is referred to as a polymer. These "monomers" combine to form a lengthy molecular chain. It could be made up of branches or it might just be one continuous line of identically related molecules.

A polymer or macromolecule made of many amino acids, proteins are. The monomers/building blocks of a protein are amino acids. things? There are numerous varieties of proteins, which are the supporting molecules of the cell,

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There are two types of chemical compound one is covalent compound and another is ionic compound in chemistry. In ionic bonds, electrons are completely transferred. The correct option is option C.

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

Covalent compounds are formed by covalent bond and ionic compounds are formed by ionic bond. Covalent bond is formed by sharing of electron and ionic bond are formed by complete transfer of electron. Ionic bonds are stronger than covalent bonds. CCl[tex]_4[/tex], H[tex]_2[/tex]O, CO[tex]_2[/tex] are ionic compound. Al[tex]_2[/tex]O[tex]_3[/tex] is an ionic compound.

Therefore, the correct option is option C.

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The radial distance of Aluminum through Chlorine is 175pm and Aluminum is 184pm

The atomic radius of an element is half of the distance between the center of two atom of that element that are just touching each other and generally the atomic radius decreases across a period from left to right and increases down a given group and aluminum has the greater atomic radius than the chlorine and in the periodic table atomic radii decreases from left to right across a row and increases from top to bottom down a column and because of these two trends and the largest atom are found in the lower left corner of the periodic table and the smallest are found in the upper right corner

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Answer:

What is the mole fraction of sulfuric acid in a solution containing 98% sulfuric by mass?

What is the mole fraction of H2SO4 in a 98% aqueous H2SO4 solution?

Here given..

98 % of H2SO4 that means 98 g of H2SO4 is there in 100 g of aq. H2SO4 solution.

So.

Mass of solute = 98 g

Mass of solvent = 2 g (as water is considered as universal solvent)

Molar mass of solute = 98 g

Molar mass of solvent = 18 g

No of moles of solute = 1 mole (no of moles = given mass / molar mass)

No of moles of solvent = 2/18 = 1/9 moles

And ,

We know formula for mole fraction is..

x( of solute) = Moles of solute/(moles of solute + moles of solvent)

x (of solute) = 1/(1+(1/9)) = 0.9

x (of solvent) = 1 - 0.9 = 0.1

Explanation:

it is just number 1

Based on the mole ratio of the balanced equation of the reaction,

The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:

Balanced equation of reaction: 2 C₂H₆ + 7 O₂ ------> 4 CO₂ + 6 H₂O

From the balanced equation of the reaction, the mole ratio of the reaction shows that 2 moles of ethane, C₂H₆, undergo combustion with 7 moles of oxygen, O₂, to produce 4 moles of carbon (iv) oxide, CO₂, and 6 moles of water, H₂O.

Hence;

4.5 moles of ethane will require 4.5 * 7/2 moles of oxygen

moles of oxygen required = 15.75 moles of oxygen

Moles of carbon (iv) oxide, CO₂, produced = 4.5 * 4/2

Moles of carbon (iv) oxide, CO₂, produced = 9 moles

Moles of water, H₂O, produced = 4.5 * 6/2

Moles of water, H₂O, produced = 13.5 moles

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Freezing leads to weathering because water expands when it freezes and cracks rocks open Water expands when it freezes and cracks rocks open

The term weathering has to do with the process of the breakdown of the rocks to give rise to the soil. Now there are are various ways in which the process of weathering could be able to take place. One of the ways that the process of weathering can take place is what we call physical weathering.

In the process of physical weathering, we are looking at some kind of physical pressure which would lead to the breakdown of the rock. This is what makes it different from the chemical and the mechanical forms of weathering.

Thus, the fact that water would expand when we freeze it would mount pressure on the rock and then cause it to weather and form soil.

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Answer:

1 yes becuase I had studied most of the minerals in my free time. I enjoyed the 2nd one the most becuase of the fact that is had material that I was fond of not to mention I was very enthusiastic about answering the questions.i didn't like the 1st one that much becuase I didn't really understand it I feel like we should have briefed on it more before testing.

Explanation:

yw

Answer: What are the answer choices?

Explanation: I need answer choices to see, there are a lot of definitions, verbs and nouns  for an answer.

Answer:

below

Explanation:

From periodic table:

Arsenic is a metalloid in the family with Silicon (Si) which has a mass of 14

one of the most harmful organic substance to nature is

d. CFC

One of the most harmful organic substance to nature is CFC. Chemicals with carbon, chlorine, and fluorine atoms are known as chlorofluorocarbons  (CFCs) , and they are neither poisonous nor combustible.

Chlorofluorocarbons and hydrochlorofluorocarbons are formed as volatile derivatives of methane, ethane, and propane. They are completely or partially halogenated hydrocarbons that include carbon, hydrogen, chlorine, and fluorine.

They are employed as solvents, refrigerants, blowing agents for foams and packaging materials, and in the production of aerosol sprays. Freon, a brand name owned by DuPont, is another name for them.

Chlorofluorocarbons (CFCs) are a class of artificially produced, odorless compounds. CFCs have been prohibited since 1996 due to the harm they do to the ozone layer of the earth. The biodiversity of the world itself will suffer if the ozone layer is destroyed.

Thus, option D is correct.

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Answer:

Both can be measured with a low level of certainty at the same time.  

it depends on what you count as low or high levels of uncertainty though.

Explanation:

The equation is something like:
[tex]\Delta x \Delta p \geq \frac{h}{4 \pi}[/tex]

delta x is the uncertainty (not change) of position, and delta p is the uncertainty of momentum. then term on the right is a constant (in this case, a very small number)

This equation tells us that neither the uncertainty of position nor the uncertainty of momentum can be zero, which means that there will always be some uncertainty. However, we can note that both of the uncertainties can be quite small at the same time, they just can't be smaller than h/4pi. This means that both can be measured with a fairly high level of certainty at the same time. However, there is a limit of how high the values can be, so i would expect that the answer your teacher is looking for is that both can be measured with a low level of certainty at the same time. This is always true, as opposed to saying that both can be measured when a high level of certainty at the same time, since high is quite subjective

The temperature T₂, in Celsius, that is needed to reach the pressure of 7350 torr is 2517 °C

From the question given above, the following data were obtained:

Since the volume isconstant, we can determine the new temperature, T₂ as illustrated below:

P₁ / T₁ = P₂ / T₂

735 / 279 = 7350 / T₂

Cross multiply

735 × T₂ = 279 × 7350

Divide both side by 735

T₂ = (279 × 7350) / 735

T₂ = 2790 K

Subtract 273 to obtain answer in °C

T₂ = 2790 – 273 K

T₂ = 2517 °C

Thus, the temperature T₂ is 2517 °C

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