which of the following has 6.02 x 10^23 atoms a. 1 mole of argon b. 1 mole of oxygen gas c. 1.0 g of hydrogen d. 16.0g of oxygen gas

Answer:Our formula for percent composition is:

Molar mass of element

----------------------------------- x 100

Molar mass of compound

So, lets find the molar mass of the compound as a whole before we begin. We do this by adding atomic masses from the periodic table.

Ca: 40.078

S: 32.065

O4: 63.996 (15.999 x 4)

To find our total mass, all we need to do is add those numbers together! Our molar mass of CaSO4 is 136.139 g/mol.

Now, lets use those individual masses and our total mass in the equation to find the percent composition of each element.

Ca: 40.078

      ----------        equals .294, and when we multiply that by 100 we get 29.44%

       136.139

The percent composition of calcium in CaSO4 is 29.44%.

S: 32.065

    -------------  equals .235, and when we multiply that by 100 we get 23.55%

     136.139

The percent composition of S in CaSO4 is 23.55%.

O4: 63.996

      -------------  equals .470, and when we multiply that by 100 we get 47.0%

       136.139

The percent composition of O4 in CaSO4 is 47%.

Hope this helps!

In order from most basic to most acidic:

0.0023 M  HCl

pH = 5.45 and pOH = 8.55

0.0018 M  KOH

The hydrogen ion concentration of a solution, which is a measure of its acidity, determines the solution's pH. Pure water slightly separates into ions of hydrogen and hydroxyl (OH) in equal amounts. A substance's acid content is described. A chemical called an acid reacts with specific metals to create salts by releasing hydrogen ions into the water. Acidity is measured on a pH scale. A pH value between 7 and 0 denotes increasing acidity, while a pH value between 7 and 7 denotes neutrality.

Here,

Options are

pOH = 8.55    

pH= 5.45  

0.0023 M HCl                    

0.0018 M KOH

For pOH = 8.55

use equation A

pH + 8.55 = 14

pH = 5.45

For pH = 5.45

pH = 5.45

For 0.0023 M  HCl

pH = - log (Molarity)

pH = - log (0.0023)

pH = - (-2.64)

pH = 2.64

For 0.0018 M  KOH

pOH = - log (Molarity)

pOH = - log (0.0018)

pOH = 2.74

pH + 2.74 = 14

pH = 11.26

From the most basic to the acidic, in order:

0.0023 M  HCl

pH = 5.45 and pOH = 8.55

0.0018 M  KOH

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Non-polar molecules are less effective at "sticking" than polar molecules.

Nonpolar molecules are less effective at "sticking" than polar molecules because they lack dipoles that can form positive and negative ends held together by dipole-dipole interactions. The inter-dipole interactions between these instantaneous dipoles are known as dispersion forces. These forces, also called van der Waals forces, help neutral atoms and nonpolar molecules attract each other. Polar molecules differ from non-polar molecules in that they have positive and negative ends and strong intermolecular attractive forces. Non-polar molecules are less effective at "sticking" than polar molecules.

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0.12% of the substance is ionic characters, and metallic interatomic bonds would be present.

Calculating the difference in electronic configuration between the two atoms using the formula = B A is one method of determining the ionic quality of a bond, or the extent of the ionic conductivity in a polar covalent connection.

The disparity in electronegativities determines how ionic. The stronger the bond, or greater inclination to attract electrons, the greater the binding energy. The least inorganic bonds are those comprised of two non-metals, and the closer two non-metals' electronegativity values are to one another, the smaller the percentage of ionic character will be.

%ic interatomic bond = [1 - e^-(XA - XB)^2/4] * 100%

XA = electronegativity of Ti

= 1.61

XB = electronegativity of Al

= 1.54

Substituting values;

= [1 - e^-(1.61 - 1.54)^2/4] * 100%

%ic interatomic bond = 0.12%

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The answer to the question indicates that the scientist is engaged in spectroscopy.

(SOH-dee-um) A mineral required by the body to maintain the proper balance of body fluids. Table salt and many processed meals also contain sodium. The body may retain water if it is oversalted.

In some nuclear plants, sodium is employed as a heat exchanger.It is also utilized in the chemical industry as a reagent. Instead, sodium salts are so much more advantageous than sodium alone. Sodium chloride is the most prevalent sodium compound (common salt). It is used to flavor meals and de-ice roadways in the winter.

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1. When we convert 4394 mL to qts, the result obtained is 4.658 qts (4th Option)

2. When we convert 71.8 lb to g, the result obtained is 3.26×10⁴ g (1st option)

First, we shall convert 4394 mL to liters (L). Details below

1000 mL = 1 L

Therefore,

4394 mL = (4394 mL × 1 L) / 1000 mL

4394 mL = 4.394 L

Finally, we shall convert 4394 mL (i.e 4.394 L) to qts. This is shown below:

1 L = 1.06 qt

Therefore,

4.394 L = (4.394 L × 1.06 qts) / 1 L

4.394 L = 4.658 qts

Thus, we can conclude that 4394 mL is equivalent to 4.658 qts (4th Option)

We can convert 71.8 lb to grams (g) as illustrated below

1 lb = 453.6 g

Therefore,

71.8 lb = (71.8 × 453.6 g) / 1 lb

71.8 lb = 3.26×10⁴ g

Thus, we can conclude that 71.8 lb is equivalent to 3.26×10⁴ g (1st option)

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The Option d) Adding an acid or basic to the solvent is the proper choice. The safety video suggests mixing an acid or a basic with a solvent as the best practice.

Many reactions are made easier by solvents, which are substances that dissolves solutes and create solutions. They are utilized for a variety of tasks, including dry cleaning, painting, and extractions. They can be as toxic as dichloromethane or as harmless as water.

A substance that is used for a solution is called a and (from the Latin solv, "one, untie, solve"). Solutes can also be supercritical fluids, solids, or gases in secondary to being liquids.

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The Complete Question :

Which is the best practice recommended in the safety video to mix an acid or a base with a solvent?

a) you pour them at the same time

b) the order is irrelevant

c) add solvent to the acid or base

d) add acid or base to the solvent

Adding an acid or basic to the solvent is the proper choice. The safety video suggests mixing an acid or a basic with a solvent as the best practice.

Many reactions are made easier by solvents, which are substances that dissolves solutes and create solutions. They are utilized for a variety of tasks, including dry cleaning, painting, and extractions. They can be as toxic as dichloromethane or as harmless as water.

A substance that is used for a solution is called a and (from the Latin solv, "one, untie, solve"). Solutes can also be supercritical fluids, solids, or gases in secondary to being liquids.

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The Complete question is as follows:

Which is the best practice recommended in the safety video to mix an acid or a base with a solvent?

a) you pour them at the same time

b) the order is irrelevant

c) add solvent to the acid or base

d) add acid or base to the solvent

It is clear that the hydroxide ion the primary potassium hydroxide ions will convert in the case of a simple hydrocarbon ketone in a complexation solvent, for instance.

Methyl ester is meant to be used as an alternative to petroleum-based diesel fuel or it can be merged with diesel fuel in any amount to create "biodiesel," which is usually thought to be more environmentally benign.

A particular class of three fatty acid chains called monoalkyl ester (FAME) is produced by transesterifying lipids with methanol. The main molecules for biodiesel are FAME, which are typically produced by transesterifying vegetable oils.

Among the various types of fatty acid esters, fatty acid methyl additives (FAME) are a product created by transesterifying lipids using methanol. The main molecules in biofuels are FAME, which are typically produced by transesterifying vegetable oils. Detergents and biodiesel are made with them. The most common way to make methyl esters is by acid-catalyzed reactions with methanol. This method's main benefit is that free acids are simultaneously esterified and bound acids,

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A phase change in which heat is transferred from the surroundings to the system is endothermic. The phase change that involves the transfer of heat from the surroundings to the system is melting.

Melting is the process of a solid turning into a liquid, which requires energy, in the form of heat, to be added to the system in order to overcome the forces holding the solid particles together. This is why melting is an endothermic process, which means that heat is absorbed from the surroundings.

Melting is a phase change in which a solid turns into a liquid. During this process, energy is required to break the forces holding the solid particles together. This energy is in the form of heat, which is transferred from the surroundings to the system, making melting an endothermic process. The opposite of this process is freezing, where a liquid turns into a solid, this process releases heat to the surroundings, making it exothermic. The endothermic process of melting is also called fusion, and the exothermic process of freezing is also called solidification.

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The volume of the second portion is 3.75 liters. To solve this problem, let x represent the volume of the second portion. We can then set up the equation

A mathematics statement that expressions are equal is known as an equation. It consists of two expressions separated by an equals sign, and the expressions on either side can be numbers, variables, or a combination of both. Equations are used to solve problems in mathematics, science and engineering, and are fundamental to the study of these disciplines. Equations can be used to describe relationships between different elements of a system, such as the force of gravity on a falling object or the momentum of a moving object. Solving equations involves manipulating the equation to find the values of the unknown variables, and this process is called solving the equation.

4x = 15.0
Solving for x, we get:
x = 15.0 / 4
x = 3.75
Therefore, the volume of the second portion is 3.75 liters.

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The empirical formula of the oxide would be [tex]BiO_3[/tex].

The empirical formula of a compound is the chemical formula showing the component atoms of the compound in their simplest, whole-number ratio.

The compound in question contains bismuth and oxygen.

Mass of bismuth + oxygen = 10.28 g

Mass of bismuth = 8.3 g

Mass of oxygen = mass of bismuth + oxygen - mass of bismuth

                          = 10.28 - 8.3 = 1.98 grams

Moles of each atom:

Bismuth = 8.3/209 = 0.04 mol

Oxygen = 1.98/16 = 0.12 mol

Divide by the smallest mole:

Bismuth = 0.04/0.04 = 1

Oxygen = 0.12/0.04 = 3

Thus, the empirical formula of the oxide is [tex]BiO_3[/tex].

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Find the empirical formula of the oxide when 10.28 g bismuth oxide contains 8.3 g bismuth.

Energy balance on Earth. You are aware that the Earth's surface equally absorbs and emits radiation. At 255F o (-18°C or 0°F), the rate of Humanity's emission and absorption are balanced.

While some atmospheric gases absorb certain wavelengths of radiation, converting their energy into heat, other gases are transparent, allowing radiation to travel freely through them without being absorbed.

"An expected result of rising levels of air pollution, particularly those from carbon dioxide, methanol, aerosol, and black carbon particles, is the energy imbalance. These contaminants increase solar absorption and prevent heat radiation from the Earth from escaping into space "Jim Hansen from NASA's Goddard Space Flight Center.

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Answer:

B (ionic bond)

Explanation:

Because it is! :)

The combination of the n and l represent the real orbitals the impossible one  is 2d . It will not occur as orbital in electronic configuration.

1) 1s = In the electronic configuration it occurs as a orbital. This means it represent the real orbitals.  

2) 2p =  In the electronic configuration it occurs as a orbital. This means it represent the real orbitals.  

3) 4s =  In the electronic configuration it occurs as a orbital. This means it represent the real orbitals.  

4) 2d =  In the electronic configuration it not occurs as a orbital. This means it is not  represent the real orbitals.  

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69.45 ml of 0.0887 m Mgcl2 solution is needed to make 275.0 ml of 0.0224 m Mgcl2 solution

A combination of one or even more solutes that have been dissolved into a solvent is referred to as a solution. To create a homogenous mixture, a solute must be completely dissolve in a solvent.

V1M1 = V2M2

Where,

V1 = volume of first solution = V1

V2 = volume of second solution = 275.0 ml

M1 = molarity of first solution = 0.0887 M

M2 = molarity of second solution = 0.0224 M

On putting values we get -

V1M1 = V2M2

V1 × 0.0887 = 275.0 × 0.0224

V1 = 6.16 / 0.0887

V1 = 69.45 ml

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To calculate the pH of this solution, we must use the equation pH = -log[H3O+], which yields a pH of 1.834.

pH is a measure of the acidity or alkalinity of a solution. It is measured on a scale from 0 to 14, with lower numbers indicating an acidic solution and higher numbers indicating a basic or alkaline solution.

The chemical equation for the dissociation of H3C6H5O7 is:

H3C6H5O7 + H2O <=> H3O+ + H2C6H5O7-

The first dissociation of H3C6H5O7 produces one H3O+ ion for every H2C6H5O7- ion. Therefore, the [H3O+] is equal to the molar concentration of the acid, which is 0.145M.

To calculate the pH of this solution, we must use the equation pH = -log[H3O+], which yields a pH of 1.834.

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In chemistry, bond strength is the force that a chemical bond uses to hold two atoms together.

The bond dissociation energy, or the amount of energy needed to break a certain covalent bond in a mole of molecules, is a measure of a covalent bond's strength. Multiple bonds between the same atoms are more powerful than a single bond.

Chemical reactions that release energy are known as exothermic reactions. Light or heat are released as a result of this interaction. Energy is used in an endothermic reaction. Enthalpy, or delta H, is the change in heat energy. The reaction is exothermic if the product enthalpies are more than the total of the reactant enthalpies. The process is endothermic if the products side has a higher enthalpy than the process side. As a result, the reaction is exothermic if delta H is negative. A process is endothermic if delta H is positive.

Exothermic are: A+BC -> AB+C A2+B2 -> 2AB

Endothermic are: AB+C -> AC+B A2 + C2 -> 2AC B2+C2 -> 2BC

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The complete question is

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released)

endothermic

B2+C2-->2BC

A+BC-->AB+C

exothermic

AB+C-->AC+B

A2+C2-->2AC

A2+B2-->2AB

The side of the ladder are made up of alternating sugar and phosphate molecules the steps of the ladder are made up of bases held together by hydrogen bonds.

The fundamental unit of DNA is referred to as a nucleotide. One sugar molecule, one phosphate molecule, and one of the four bases make up a nucleotide. DNA's nucleotides align to form two lengthy backbones that resemble a ladder's handrails in the shape of sugar and phosphate molecules. Between the sugar molecules on the two handrails, two bases combine to form the ladder's rungs. The "rungs" between the phosphate molecules are absent. This was significant to Watson and Crick since it enabled them to understand the formation of the double helix.

James Watson and Francis Crick discovered the DNA structure in 1953. A double helix, often known as a twisted ladder, is the structure. Sugar and phosphate molecules alternately make up the sides of the ladder. Hydrogen bonds serve as a flimsy means of holding the two sides of the DNA ladder together.

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Answer: A temperature of 273 K is the temperature at which water FREEZES.

The original temperature of the water was 20.64°C (rounded to two decimal places).

To find the original temperature of the water, we can use the formula for heat transfer:

Q = m * c * ΔT

where Q is the heat transferred, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

Given:

Q = 3200 J (heat transferred)

m = 25 g (mass of water)

c = 4.18 J/g°C (specific heat capacity of water)

We want to find ΔT, which is the change in temperature.

Rearrange the formula to solve for ΔT:

ΔT = Q / (m * c)

ΔT = 3200 J / (25 g * 4.18 J/g°C)

ΔT ≈ 30.62°C

Now, we can find the original temperature of the water:

Original temperature = Final temperature - ΔT

Original temperature = 67°C - 30.62°C

Original temperature ≈ 36.38°C

So, the original temperature of the water was approximately 36.38°C.

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This type of reaction between potassium carbonate (k2co3) and nitric acid (HNO3) is Acid-base neutralization reaction.

2HNO3+K2CO3⇒ 2KNO3+H2O+CO2

Potassium carbonate is a weak base whereas Nitric acid is a very strong acid. The reaction between them neutralizes each other forming water. The weak nitric acid reacts with the strong potassium base to produce salt, water and carbon dioxide which is given off.

Molecular ratio of reactants is 2 : 1.

All phases are represented in the equation: aq for aqueous, l for liquid and g for gas (notice how they are written in subscript).

The reaction is an acid-base neutralization reaction.

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In the structure below, the carbon atom that bears the negative charge is connected to two hydrogen atoms.

Hydrogen Atom is a single atom composed of one proton and one electron. It is the simplest and most abundant type of atom in the universe, making up about 75% of all matter. Hydrogen atoms are extremely small and have no measurable volume. They are held together by the electromagnetic force between the positively charged proton and the negatively charged electron.

This is because the two red dots, which represent the negative charge, are at the end of two single bonds connected to two hydrogen atoms. Therefore, the carbon atom is connected to two hydrogen atoms.

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An intensive property is a physical characteristic that occurs as a substance's quantity of matter varies. While an extensive property is a change in a substance's amount of matter.

When a characteristic remains unaffected by the mass of an element or system, it is classified as intense. Density (D), pressure (P), and temperature (T) are a few characteristics of strong characteristics (r).

The sample size utilized to test the attribute has no bearing because intense qualities are bulk independent. A sample of liquid water, for instance, has the same density whether that it's in the form of a tumbler or a cubed foot. It is a priceless asset.

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The amount of sodium sulfide is formed when 1.25 g of hydrogen sulfide is bubbled into a solution containing 2.00 g of sodium hydroxide, at 92.0% yield  is found as 0.897 g

Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grammes per mole of a substance, to put it another way.

2NaOH + H2S => Na2S + 2H2O

Moles = Mass/ Molar mass;

The molar mass of hydrogen sulphide is 34 g/mol.

              moles => 1.25/34 => 0.036mol

The molar mass of sodium hydroxide is 40 g/mol.

             moles=> 2/40 => 0.05mol

The stoichiometric coefficient of NaOH is 2

                moles of NaOH = 0.05/2 = 0.025 mol

The mass of NaOH used => 0.025 x 40 => 1g

The molar mass of Na2S = 78 g/mol

Based on balanced reaction, 80 grams of NaOH will give 78 g of Na2S.

             => 1g of NaOH => 78 x1/80 => 0.975g of Na2S

92 % of 0.975 = > 0.897 g of Na2S.

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The molar mass of the compound as shown is 46 g/mol.

We know that the molar mass is the mass of one mole of the substance. In the case of the compound that we have here we have to find out what the molar mass of the compound is.

First, we have to know the relative atomic mass of each of the atoms in the compound. We have that;

Mass of the lithium = 7

Mass of sulfur = 32

Then we would have;

Relative atomic mass = 2(7) + 32 = 46 g/mol

The compound would then has a mass of 46 grams per mole.

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In their laboratory in Paris, Marie and Pierre Curie were able to successfully separate radioactive radium salts from the mineral pitchblende. In 1898, the Curies' study of pitchblende led to the discovery of the elements radium and polonium.

The majority of radium's functions have been replaced by those of other radioactive substances or radiation-emitting machinery. Radium is still utilized today, but, in a few different contexts, like industrial radiography.

Scientists and medical experts eventually understood that the ailments of these individuals were being brought on by internal contamination as from radium they swallowed. On watch and clock dials, radium was no longer utilized by the 1970s.

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To investigate using the periodic table is that The color of the element. The exposure test of the element. The boiling and the me radium is radioactive. The radium is not available for the general public purpose.

In the periodic table there are some question to investigate whether the the poison was phosphorus or radium are :

The red phosphorus in its purest form consider as the non toxic. The white phosphorus is the deadly poison , when exposed to the air.

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In a drag race, the force delivered to the automobile is twice by the driver pushing on the gas pedal, based on the connection of the variables in Newton's second law.

The car's acceleration will double.

The car's mass will stay constant.

The car's velocity will rise.

Remember that the force on an item is linked to its mass and acceleration by the formula F = ma, where m is the object's mass and an is its acceleration. What happens when we multiply F by two? You might recall from algebra that if we double one side, we must also double the other, so our equation becomes 2F = 2ma. This is necessary to maintain our equality. Either the mass has doubled or the acceleration has doubled, depending on your perspective.

We can tell right away that it would be ridiculous if a race car's mass doubled with every pedal press, so the quantity that is doubling must be the acceleration. The new velocity of the car will be determined by adding the doubled acceleration to its current velocity, v1, which we shall refer to as. V = v1 + 2a in mathematics.

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The pennies contain a lot of copper thus they are called "coppers".

The coins are used as money. They can be looked upon as metallic money. The pennies are one of the coins that we have and they are therefore a unit of money.

The pennies are composed mostly of copper. The full components of the pennies are; 95% copper and 5% tin and zin. It is thus clear that in the penny coin, the metal that has the greatest percentage is copper hence they are called "coppers".

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Answer:

Below

Explanation:

From periodic table

Mole wt of  K = 39.098

                   H =1.008

                   O=15.999       total wt per mole KOH  = 56.105 gm/mole

75.05 gm  /   56.105 gm/mole =  1.34 moles of KOH

N2(g) + 2 H2O N2(g) + O 2(g) (g) At a 50% yield, the process generates 4.0 moles of N2. Therefore, 4.0 * 100 / 50 = 8.0 moles of hydrazine are used to produce the theoretical yield of N2.

Are rockets still powered by hydrazine?

Hydrazine is still used in some military vehicles nowadays, but it's mainly used for extraterrestrial exploration. Hydrazine was used to help the Curiosity Rover touch down on Mars in 2012. Since then, it has been living there.

Why is hydrazine such a poison?

Since the liquid is caustic, both humans and animals who come into touch with it may develop dermatitis. Animals who were chronically (over a lengthy period of time) exposed to hydrazine through inhalation have shown effects on their thyroid, liver, spleen, and lungs.

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