A solution has a volume of 375 ml and contains 42.5 g of NaCl. What is its molarity?

Based on the blood alcohol concentration values:

a. 0.003 grams of alcohol in a 15 ml sample of blood is classified as not impaired

b. 0.006 grams of alcohol in a 5 ml sample of blood is classified as impaired

c. 0.01 grams of alcohol in a 12 ml sample of blood is classified as impaired

d. 0.006 grams of alcohol in a 20 ml sample of blood is classified as not impaired

The blood alcohol concentration is the amount of alcohol present in a given volume of blood.

Blood alcohol concentration is used to measure intoxication in individuals.

When blood alcohol concentration increases, impairment increases in individuals.

The benchmark level of impairment or non-impairment is 0.08%.

Calculating the blood alcohol concentration for the given situations:

a. 0.003 grams of alcohol in a 15 ml sample of blood

BAC level = 0.003/15 * 100%

BAC level = 0.02%

b. 0.006 grams of alcohol in a 5 ml sample of blood

BAC level = 0.006/5 * 100

BAC level = 0.12%

c. 0.01 grams of alcohol in a 12 ml sample of blood

BAC level = 0.01/12 * 100

BAC level = 0.083%

d. 0.006 grams of alcohol in a 20 ml sample of blood

BAC level = 0.006/20 * 100

BAC level = 0.03%

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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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Answer: Molecular Weight of 4Ca(OH)2 is 296.3707 g/mol

Explanation The molar mass and molecular weight of 4Ca(OH)2 is 296.371.

Answer:

acidic

Explanation:

As concentration is given we can find out pH using -log(concentration)

So input, -log(2.27X10^-3) and it gives us 2.644 (appx.)

according to the pH chart, pH value lesser than 7 refer to acidic substances. pH value 7 means neutral and pH value higher than 7 means basic. As 2.644 is less than 7, so it is acidic.

The number moles of Cl atoms in a 75.0 mL sample of CCl₄ is 3.12 mol.

The data is given is as follows :

volume = 75.0 mL

density = 1.6 g/cm³ = 1.6 g/mL

Density = mass / volume

mass = density × volume

         = 1.6 × 75

         = 120 g

moles of CCl₄ = mass / molar mass

                       = 120 / 153.82

                       = 0.780 mol

1 mole of CCl₄ = 4 mole of Cl

moles of Cl = 4 × 0.780

                    = 3.12 mol

Thus, The number moles of Cl atoms in a 75.0 mL sample of CCl₄ is 3.12 mol.

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Answer:

the last one (if we consider the typo ? as 2)

Explanation:

p orbital can hold 6 electrons

1st orbit only has 's' orbital

2nd orbit only has 's' & 'p' orbital, no 'd' orbital

Answer:

High concentration of ions means that the solution is very acidic. These types of solutions have a pH < 7.0, so a very low pH.

Therefore, the answer that most closely matches the criteria would be 2.

The VSEPR model helps in explain how electric charges affect bonding and molecular shape in covalent compounds as -

The form of many molecules and polyatomic ions can be predicted using the valence-shell electron-pair repulsion (VSEPR) model, which is pronounced "vesper." However, keep in mind that the VSEPR model, like any model, is only a partial description of reality; it doesn't reveal bond lengths or the existence of numerous bonds.

The structures of many compounds and polyatomic ions with a central metal atom can also be predicted by the VSEPR model, as can the structures of practically any molecule or polyatomic ion with a central nonmetal atom. The foundation of the VSEPR theory is the idea that electron pairs in bonds and lone pairs reject one another and would, as a result, adopt a geometry that spreads them as far apart as feasible. The three-dimensional structures of many compounds, which cannot be predicted using the Lewis electron-pair approach, can be predicted using the straightforward VSEPR counting procedure, despite the fact that this theory is oversimplified and does not take into account the subtleties of orbital interactions that influence molecular shapes.

By concentrating only on the number of electron pairs surrounding the central atom and disregarding any other valence electrons present, the VSEPR model can be used to predict the geometry of the majority of polyatomic compounds and ions. This model states that valence electrons in the Lewis structure form groups that can be made up of a single bond, a double bond, a triple bond, a lone pair of electrons, or even a single unpaired electron, which is treated as a lone pair in the VSEPR model. Electrostatic repulsion causes electrons to repel one another; hence, the arrangement of electron groups that minimises repulsions is the most stable (lowest energy). The arrangement of groups around the centre atom creates the molecular structure with the lowest energy

The molecule or polyatomic ion is designated by the letters AXmEn in the VSEPR model, where A stands for the centre atom, X for a bonding atom, E for a nonbonding valence electron group (often a lone pair of electrons), and m and n are integers. The designation of each group surrounding the centre atom as a bonding pair (BP) or lone (nonbonding) pair (LP). Both the relative locations of the atoms and the bond angles—also known as bond angles—can be predicted from the BP and LP interactions. We may characterise the molecular geometry—the configuration of the bound atoms in a molecule or polyatomic ion—using this knowledge.

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As per the VSEPR model, the lone pair present in a compound causes bending in the molecular geometry of the covalent compounds.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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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 slope of the line would be m = nRT.

How to prove this answer?

We know that the ideal gas law is PV = nRT.

We know that y = mx + b. In that case, plotting y vs x gives you a slope

of m and an intercept of b.

Here according to the question, If we send V to RHS,

P= (1/V) nRT Where y axis is P and 1/V is y axis, nRT would be the ultimate slope.

Howerver, intercept c ( y=mx+c) would be 0 as we considered ideal situation with temperature , R constant.

Therefore, Slope would be nRT.

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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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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:

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

Liquid water form when a salt solution (like sodium chloride or magnesium sulfate)evaporates so only water can evaporates

Saline solution is also called as salt solution it is the mixture of salt and water and normal saline solution contain 0.9 percent sodium chloride and which is similar to the sodium concentration in blood and tear and the water molecule that evaporate become a gas called water vapor and only the water evaporated and leaving the sodium and chloride ion behind and sodium and chloride ion attract each other and reform salt crystals

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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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The correct statement about the combustion of glucose with oxygen to form water and carbon dioxide is The entropy of the products is greater than the entropy of the reactants.

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant.

A familiar example of a combustion reaction is a lighted match. When a match is struck along the match box, friction heats the head of the match to a temperature at which the chemicals react and then generate more heat which can escape into the air, and they burn with a flame after reacting with the oxygen.

In the above given question we can see that when combustion reaction of glucose takes place we can see that it produces water and along with that we can also see that carbon dioxide gas is also been released. In the reactant side we can see that there are no gaseous molecules present but we can see that in the product side there are gaseous molecules present, which suggests that randomness of the system is increased.

Hence the entropy of the products would be greater than the reactants.

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The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.

The  combustion reaction is given as :

C₆H₁₂O₆   +   6O₂    ---->   6CO₂    +   6H₂O

The large molecule that is glucose is converted into the small small molecules water and the carbon dioxide. this is the reason the entropy of the product side is greater than the entropy ( the disorder )of the reactants .

Thus, The following statements about the combustion of glucose with oxygen to form water and carbon dioxide is the entropy of the product is greater than the entropy of the the reactants.

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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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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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The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.

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

Empirical formula = CH₂O

Molar mass of compound = 150 g/mol

Scaling factor (n) =?

Empirical formula × n = molar mass

[CH₂O]n = 150

[12 + (2×1) + 16]n = 150

[12 + 2 + 16]n = 150

30n = 150

Divide both sides by 30

n = 5

Therefore, the scaling factor is 5

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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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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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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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The mass equivalent of the individual on the moon would be = 11.67kg.

Mass is defined as the scalar quantity that is used to determine the amount of matter within an object. It is measured in Kilograms or grams.

The mass of gravity is defined as the gravitational pull that occurs with the mass of objects towards the center of the earth.

In earth, the mass of gravity is represented as = 1

In moon the mass of gravity = 1/6

To determine the mass of gravity of the same object in moon would be;

= 1/6 × 70

= 11.67kg

Therefore, in the moon, the mass of 70kg man would be = 11.67kg.

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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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Answer:

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

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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In the redox reaction Cr + Ni²+ → Cr³+ + Ni, the electrons are transferred in the balanced reaction is 3 electrons.

In this given reaction,

 Cr → Cr³+  + 3e-

 Ni²+ + 2e- → Ni

+_____________

Cr + Ni²+ → Cr³+ + Ni

In the redox reaction, determine the lowest common multiple of the number of electrons gained in the reduction and lost in the oxidation. In redox reaction, a type of chemical reaction  that involves a transfer of electrons between two species.

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A container of iron (III) carbonate contains 4.15 x 10^26 carbon atoms.  this sample of iron(III) carbonate weigh is 2.0 × 10⁵ g

iron(III) carbonate , number of atoms = 4.15 × 10²⁶ atoms

Avogadro's number = 6.022 × 10²³

moles of iron(III) carbonate = number of atoms / Avogadro's number

                                            =  4.15 × 10²⁶ /  6.022 × 10²³

                                            = 6.89 × 10² mol

mass of  iron(III) carbonate = moles × molar mass

                                            = 6.89 × 10² × 291.7

                                            = 2.0 × 10⁵ g

Thus, A container of iron (III) carbonate contains 4.15 x 10^26 carbon atoms.  this sample of iron(III) carbonate weigh is 2.0 × 10⁵ g

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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