a compound is found to contain 13.65 % carbon and 86.35 % fluorine by mass. what is the empirical formula for this compound? to answer the question, enter the elements in the order presented above.

Hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory is how they are reconciled and is denoted as option D.

This is a term in chemistry which refers to the process in which atomic orbitals mix to form a new atomic orbital. The orbital usually has a different shape and a similar energy during the mixing process.

It helps us to reconcile valence bond theory with vsepr theory by producing orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory hence why option D was chosen.

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Three hardest substances that were tested is aluminum, silicon dioxide and sucrose and the classes of solids do these substances belong is metallic type of solid and general feature do these three types of solids have in common are melting point and hardness

Hardest substance are that cannot be crushed, cut distorted or scrapped readily and the hardness of a substance is dictated by its crystalline structure which is regular and the three three hardest substances that were tested is aluminum, silicon dioxide and sucrose

Three substances classes of solid are also same the classes of solids these substances belong is metallic type of solid and general feature are also same of solids have in common are melting point and hardness metallic solid means metal is a solid in which hard in the nature shiny and smooth and so many metals are too hard

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Answer: Fe is the element that is being oxidized (oxidation number changes from +2 to +3) while Cl is the element that is reduced (oxidation number changes from +5 to -1) in the given reaction.

Explanation:

The question requires us to find the element that is oxidized and the one reduced in the following chemical reaction:

To solve this problem, we need to determine the oxidation number of all elements in the reactants and products sides, and then identify the elements that had their oxidation number increased (oxidized species) and decreased (reduced species).

To identify the oxidation numbers, we'll need to remember a few points:

- K is an alkali metal (part of group 1 in the periodic table), and it usually assumes the oxidation number +1;

- O usually presents oxidation number -2, except in a few specific cases;

- the anion (SO4) presents total charge -2 (in this anion, S presents oxidation number +6 and O, -2);

- H usually presents oxidation number +1.

Next, let's identify the oxidation number of all elements involved in the reaction, on both sides of the chemical equation. Since all compounds are neutral (i.e., they do not present charge), the sum of all oxidation numbers must be 0:

(note that the oxidation number of each element is indicated in red, above the respective element, while the contribution of this element to the molecule charge, considering the number of atoms, is represented in blue below the element).

In the image above, we can see that Cl has its oxidation number changing from +5 in KClO3 to -1 in KCl (highlighted in purple), while Fe has its oxidation number changing from +2 in FeSO4 to +3 in Fe2(SO4)3 (highlighted in green).

Therefore, we can say that Fe is the element that is being oxidized while Cl is the element that is reduced in the given reaction.

Answer:

need the free questions srry yall

Explanation:

The type of conservation effort which involves the captive breeding program to increase the population numbers of Ferrets is  resource conservation and is denoted as option A.

This is referred to as the process in which valuable resources which are present on earth such as plants, minerals etc are protected through various means by the appropriate authorities or individual.

Conservation helps to prevent dying out and extinction of species which is denoted in the captive breeding program to increase the population numbers of Ferrets so as to prevent the extinction of the animal hence option A was chosen.

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Answer:

I think it's carry energy, but I'm not sure

Answer:

There are 2.2 moles of hydrogen.

Explanation:

The given information from the exercise is:

- Volume (V): 48.6L

- Temperature (T): 0°C (273K)

- Pressure (P): 1atm

1st) It is important to convert the temperature unit from °C to Kelvin:

This first step is very important, because all the units must be at atm, L and Kelvin, before using the Ideal Gases Law formula.

2nd) Now to calculate the moles of hydrogen, we hae to replace the values of V, T and P in the Ideal Gases Law formula:

R: is the gases constant, in its value is 0.082atm.L/mol.K.

So, there are 2.2 moles of hydrogen.

The volume of the balloon when the balloon descended down in the water becomes 0.0217 Liters.

We know, from the Boyle's Law,

If the temperature of a gas is kept constant, the pressure of the gas and the volume of the gas becomes inversely proportional to each other.

So, we can write,

P₁V₁ = P₂V₂

Where,

P₁ is the initial pressure of the gas,

V₁ is the initial volume of the gas,

P₂ is the final pressure of the gas,

V₂ is the final volume of the gas.

According to the given condition, the initial volume of the ideal gas was 1.52 L and the initial pressure of the gas is 1 atm and the final pressure of the gas is 70 atm while the final volume is unknown,

So,

1.52 x 1 = V₂ x 70

V₂ = 0.0217 Liters.

The final Volume of the gas is 0.0217 Liters.

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Acid - base pairs.

Arrhenius theory, says, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−).

It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined state with a water molecule, as the hydronium ion (H3O+). In practice the hydronium ion is still customarily referred to as the hydrogen ion.

----------------------------------------------------------------------------------------------------------------

a) HClO3 + H2O <=> H3O + + ClO3-

HClO3 is the acid, ClO3- is the base (acid-base pair)

H2O acepts that H+ from the HClO3, and becomes H3O+

H2O is a base, H3O+ is the acid (acid-base pair)

----------------------------------------------------------------------------------------------------------------

b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-

Here HSeO4 - can free one H so it would be the acid, and SeO4 2- is the base.

NH3 receives H+ from acid, so it is the base, and NH4+ is the acid.

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c) HCO3- + OH - <=> CO3 2- + H2O

HCO3- gives away one H, so it is the acid, and CO3 2- is the base

(HCO3-,CO3 2-) acid-base pair.

OH- receives the H+ and becomes H2O. OH- is the base and H2O acid.

H2O can be acid and base, remember that. In this case it is the acid.

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d) C5H5NH + + H2O <=> C5H5N- + H3O+

C5H5NH has the H, but on the right it doesn't, so it would be th acid. C5H5N- is the base.

H2O here is a base, because it receives the H+, and becomes H3O+ (the acid).

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(a), (b), and (d) are the sets of quantum numbers that are not allowed in the hydrogen atom.

Hydrogen is a single-electronic species i.e. only one electron is accommodated in the orbital. The electronic configuration of hydrogen is 1s¹. It expresses the set of possible quantum numbers for one electron.

The range of 'ℓ' lies between '0' to 'n-1' i.e. '0' to '0'.

The range of 'm' lies between 'ℓ-1' to 'ℓ+1' i.e. '0' to '0'.

(a) n≠3; The principal quantum number representing one electron of hydrogen is '1'.

(b) n≠4; The principal quantum number representing one electron of hydrogen is '1'.

(d) n≠2; The principal quantum number representing one electron of hydrogen is '1'.

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During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.

Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).

The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.

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Answer:

1st box: Potential

2nd box: Electrical

3rd box: Kinetic

Explanation:

(1st box) Potential because the energy is stored and ready to act, which is definitely something desired for a battery.

(2nd box) Chemical, as discussed in the comments

(3rd box) Kinetic because the stored, potential energy is now 'acting' or 'in motion', causing it to be kinetic energy.

Answer:

Batteries store potential chemical energy

That the swith releases it into kinetic energy to light the room.

Explanation:

Energy comes in two main forms:

2. Potential energy which is energy stored in object to be realesed to make effect. It can be stored in form of

And there is much more....

Principle of conservation of energy says energy is not created nor destroyed but transferred from and object to another in different forms.

When a magnesium atom becomes a cation, the size of the radius decreases because it lost electrons (Option A)

Magnesium is a divalent metal. It loses its valence electrons to form a stable octet electronic configuration.

Generally, the ions (or cations) of metals tends to be smaller than their atoms because they lose electrons to form ions.

Now, we shall consider the atom and the ion of magnesium to see the difference. Please see attached photo

Magnesium lose electrons to form ion (cations) as follow:

Mg -> Mg²⁺ + 2e

From the equation and the diagram, we can see that the ion of magnesium is smaller than its atom.

This is so because the magnesium atom has two electrons more than the magnesium ion.

Thus, we can say that the correct option is: decreases because it lost electrons (Option A)

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Answer:

q2

Explanation:

Both the reactants are gases at STP.

Equation:

2H2S + 302 → 2SO2 + 2H2O

As per this equation 2 moles (2 x 22.4 L) of H2S

need 3 moles (3 x 22.4 L) of oxygen for their

complete oxidation.

So, volume of oxygen needed for 2.8 L of H2S =

(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)

(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).

Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.

(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.

Given: Volume of hydrogen sulfide (H₂S) = 50 cm³

Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂

To find the volume of oxygen, we can solve for x:

x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S

Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).

Using the ideal gas law equation: PV = nRT

Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P

Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)

Calculate the moles of O₂ using the obtained value from the proportion.

Finally, convert the volume from liters to cm³ by multiplying by 1000.

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The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.

Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.

The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.

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By calculating the response factor for the internal standard first, we can calculate that the concentration of the unknown analyte sample is 2.64 ppm.

When solving problems like this, we need to calculate the appropriate response factor:

A(X) / C(X) = F * A(S) / C(S)

A(X) - response for the analyte (3.47)

C(X) - concentration of the analyte (1 ppm)

F - response factor

A(S) - response for the internal standard (5.23)

C(S) - concentration of the internal standard (1 ppm)

F = A(X) * C(S) / (C(X) * A(S)

F = 3.47 * 1 ppm / (5.23 * 1 ppm)

F = 0.663

Now we can use this in the second calculation to obtain the concentration of the analyte in the sample. One thing to note is that in second measurement 1 mL of a 5.00 ppm internal standard was diluted to 10 mL, so the concentration of the internal standard is actually 5.00 ppm / 10 = 0.500 ppm.

4.26 / C(X) = 0.663 * 2.43 / 0.500 ppm

C(X) = 4.26 * 0.500 ppm / (0.663 * 2.43)

C(X) = 1.32 ppm

Because 5 mL of the analyte solution were diluted to 10 mL, the concentration is actually 2 * 1.32 ppm = 2.64 ppm.

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When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

Endothermic reaction occurs when heat is  absorbed by the system from surrounding. while Exothermic reaction occurs when heat is released by the system in surrounding. In endothermic reaction , the system absorbed the energy from its surrounding in the form of heat.

Thus, When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

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Answer:

1H2+1O2—>H2O2

Explanation:

Use the integer+1

We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.

The rate of any chemical reaction depends upon the nature of the reacting substances.  Under the same conditions , reactions that appear similar have different rates of reaction. Chemical reaction proceeds in different speeds, depend on the various factors such as type of chemical transformation , temperature and other factors. the information about the speed of reaction is useful in large scale production.

Thus, We need to understand that reactions can happen at different speeds depending on the conditions to develop methods for production improvement.

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Answer:

So, liquid H2 will be distilled first, after this liquid N2 will be distilled, followed by liquid O2 and liquid CO2 will be distilled last.

The compound will lower molecular weight will distill out first as it will evaporate fast.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions. Purchase dilute acids whenever possible Acid handling requires the use of latex gloves. Solvent and chemicals in miscellaneous category require the use of polythene gloves. Check the gloves for any pin-holes prior to use. Wash your hands before eating, even if gloves were used while handling the chemical.  

i know it'sis a lot and it's a little messed up but can you handle it if you can and if it's right you mind giving me a brainliest?

Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions

The chemical reaction that occurs when the positive ion from one compound replaces the positive ion of the other compound is double replacement

What is a double displacement reaction?

This is a type of reaction in which there is an exchange of ion between the reacting agent. The ion in one of the reactant replaces or displaces the ion in the other reactant to produce two new products.

The reaction between sulphuric acid and potassium hydroxide illustrates a double displacement reaction

H₂SO₄ + 2KOH —> K₂SO₄ + 2H₂O

From the above equation, we can see that K and H exchange to produce K₂SO₄ and H₂O

With the above illustration we can answer the given question as follow

AB + CD = AD + CB

The above reaction is a double displacement reaction since A and C exchange to produce AD and CB

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Answer:

A because density DOES have a unit

Explanation:

The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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A sample of gas occupies a volume of 70.3 ml as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr and the final volume of the gas is 11.12L

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container and even in the presence of gravity and regardless of the amount of substance in the container

Here given data is 11.12L

V₁ = Initial volume = 70.3 ml = 0.0703ml =  (1L=1000ml)

w = 140.6 J = 1.387 J = (1Latm=101.3J)

Pressure =  783 torr = 1.03 atm  = (1atm=760 torr)

V₂ = final volume = ?

1.387Latm = 1.03 atm × (V₂ - 0.0703ml)

(V₂ - 0.0703ml) = 11.05

V₂ = 11.12L

The final volume of the gas is 11.12L

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Dr. Peterson performed an experiment in order to research the growth rate of mice. He had two groups of mice and he fed one group a type of food with added chemical which results in increasing the growth rate and fed same group of food to another batch without adding any chemicals. His research conveyed that chemical A increased the growth rate of mice by approximately 30%. He performed the same experiment 4 times and got the same result every time. Dr. Peterson concluded that the chemical A results in increase of growth rate of mice. The Interpretation of Dr. Peterson's experiment was supported by the evidence received from his experiment. Therefore, option C is correct.

In his experiment, Dr. Peterson found out that chemical A results in increasing the growth rate of mice by 30% and to make sure that the result obtained is valid and evidential, he performed the same experiment 4 times. Since every time the experiment was repeated, the result came out to be same, the closing statement from his experimental study can be accepted because they are backed by evidence.

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The biopharmaceutics classification system would identify this drug as class ll drug having greater than 90% absorption.

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The reactivity of a substance with oxygen is a chemical, not a physical property. The reason it is called a chemical property is that it relies on its electron configuration to determine how it behaves around other substances.

A chemical property is a property of any material that becomes apparent during or after a chemical reaction; that is, any quality that can only be determined by changing the chemical properties of a substance.

Oxygen is a very reactive element, is highly paramagnetic and readily combines with other elements. One of the most important chemical properties of oxygen is that it promotes combustion. Even at room temperature, oxygen binds to elements and forms e.g. rust.

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Answer: type the compound into your search bar then it should tell you what it is for 3. you should look up "what is the formula for -----" same thing for #4

Explanation:

Answer:

2.a.  germanium tetrahydride

2.b. dinitrogen tetrabromide

2.c. diphosphorus pentasulfide

2.d. selenium dioxide

2.e. nitrogen trihydride

2.f. silicon dioxide

3.a. PO3

3.b. SiCl4

3.c. N2O5

3.e. N2O4

3.f. CO

4.a CO2

4.b. SF6

4.c. N2Cl4

4.d. CI4

4.e. PF5

4.f. P2O5

****All numbers are subscripts, please do not write them as is, but to the bottom right of them like shown in the options from question 2.

Explanation:

To name covalent compounds (NM+NM), we use prefixes.

To name covalent compounds goes as follows:

First, name the first element in the formula the normal name it has (ex. Nitrogen, Oxygen). If the first element is present more than once shown by a subscript, use a prefix that will indicate how many there are present (ex. mono, di, tri).

Next, name the second element in the compound using prefixes aswell if present more than once. These elements though, will end with -ide instead of their original name (ex. monoxide, dibromide, trichloride).