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Determine the empirical formula of a 28.00 gram sample containing 22.90 grams carbon and 5.10 grams hydrogen.

When a molecule lacks polar bonds, there is no permanent charge difference between parts of the molecule, and the molecule is nonpolar.

Because the electron charge on both atoms is identical, the Cl2 molecule has no polar bonds. As a result, it is a nonpolar molecule. Hydrocarbons are nonpolar molecular substances because none of the bonds in hydrocarbon molecules, such as hexane, C6H14, are significantly polar.

The molecule is nonpolar if the arrangement is symmetrical and the arrows are of equal length. The molecule is polar if the arrows are of different lengths and do not balance each other. The molecule is polar if the arrangement is asymmetrical.

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First, let's write the balanced chemical reaction:

2 H2O2 ---MnO2--> 2 H2O + O2

This reaction is a b. Decomposition Reaction of hydrogen peroxide.

Step 1. Let's transform 2.11 mg of H2O2 into moles using the following equation mole = mass / molar mass

Step 2. We are going to use the equation proportion to calculate the quantity in moles of each compound.

Step 3. We are going to transform moles into grams of each compound using the following equation: mass = mole x molar mass

Step 1.

We need to transform 2.11 mg to g. We just need to divide by 1000,

So: 2.11 x 10^-3 g of H2O

mole = 2.11 x 10^-3/34.02

mole = 6.20 x 10^-5 moles

Step 2.

2 moles of H2O2 ---- 2 moles of H2O

6.20 x 10^-5 moles ---- x moles of H2O

x = 6.20 x 10^-5 moles of H2O

2 moles of H2O2 ---- 1 moles of O2

6.20 x 10^-5 moles ---- x moles of O2

x = 3.10 x 10^-5 moles of O2

Step 3.

molar mass of O2 : 32 g/mol

molar mass of H2O: 18 g/mol

mass of H2O = 6.20 x 10^-5 x 18 = 1.12 x 10^-3 g

mass of O2 = 3.10 x 10^-5 x 32 = 9.92 x 10^-4 g

A molecular of this compound contains 6 hydrogen atoms. An atom is a component of an element. Each atom in a specific element has only one type of atom. Electrons, protons, and neutrons

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Dry ice sublimates when its molecules get enough thermal energy to the intermolecular holding the solid crystal together in some cases. This allows some molecules to transition directly into the vapor phase.

A substance can sublimate directly from its solid to it's own gaseous state without going through a liquid phase. Sublimation is the term most frequently used to describe the process through which snow and ice turn into water vapor in the air before even melting into liquid for those of us who is interested in the water cycle.

The sublimation procedure is used by chemists to clean up their substances. Typically, a solid is heated in a sublimation apparatus under vacuum. A non-volatile residue of impurities is left behind as the solid volatilizes and condenses as a refined chemical on a cooled surface (cold finger) at this lower pressure.

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The weighted average of the nail size in the sample data is 0.0571 d.

To calculate the weighted average of the nail sizes in the given data, we need to first calculate the total mass of all the nails in the sample. We can do this by multiplying the number of nails of each size by the mass of one nail of that size and then adding up the results:

Total mass = (24 nails of size 3d) x (3.30 g/nail) + (176 nails of size 16d) x (12.25 g/nail)

Total mass = 79.20 g + 2156.00 g

Total mass = 2235.20 g

Next, we can calculate the weight fraction of each nail size by dividing the mass of nails of each size by the total mass:

Weight fraction of 3d nails = (24 nails) x (3.30 g/nail) / 2235.20 g = 0.000360

Weight fraction of 16d nails = (176 nails) x (12.25 g/nail) / 2235.20 g = 0.007901

Finally, we can calculate the weighted average of the nail sizes by multiplying each weight fraction by the corresponding nail size and then adding up the results:

Weighted average = (0.000360 x 3d) + (0.007901 x 16d) = 0.0571 d

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The number of moles of potassium hydroxide that would react with 1 mole of hydrochloric acid would be 1 mole.

Stoichiometric mole ratio

The stoichiometric moles of species of a reaction are the coefficients of each species in the balanced symbol equation of the reaction.

The balanced equation of the reaction between potassium hydroxide (KOH) and hydrochloric acid (HCl) is expressed as follows:

[tex]KOH + HCl --- > KCl + H_2O[/tex]

In this case, the stoichiometric mole of KOH is 1, that of HCl is 1, that of KCl is 1, and that of [tex]H_2O[/tex] is also 1.

In other words, the stoichiometric mole ratio of KOH and HCl is 1:1. For every 1 mole of KOH, 1 mole of HCl is required for a complete reaction.

Now, the question says what mole of potassium hydroxide will be required to react with 1 mole of hydrochloric acid?

Following the mole ratio, 1 mole of KOH will also be required.

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Answer:

D. 32.

Explanation:

Remember the formula of atomic mass:

If you go to see the periodic table, you can note that the atomic mass of cobalt is 58.9 amu rounded to 59 amu. Let's solve for '# neutrons' and replace the atomic mass (59) and the atomic number (27) (remember that the number of protons is the same that the atomic number), like this:

The answer would be that the number of neutrons to make a cobalt atom most stable is D. 32.

From the diagram showing an example of convection, the label that belongs on the arrow is cooler water sinks while hotter water rises.

Convection currents are currents that are set up by particles of a substance that transfer heat by the process of convection.

Convection is a form of heat transfer in which the particle of the substance transferring heat move from one point to another transferring heat as they move.

Convection is one of the three processes of heat transfer. The two other processes of heat transfer are conduction and radiation.

In the diagram shown, the heat transfer process show is convection.

The heat supplied by the flame is transferred from the bottom of the pot to the top by the movement of the water molecules. Heated water molecules move up while cold water molecules move down to replace them, thus, setting up a convection current.

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(a)  The full set of Quantum Numbers are n=4, l=0, ml=0, ms=+1/2

(b) The full set of Quantum numbers are ; n=4 , l= 1, ml=  1, ms= -1/2

(c) The full set of Quantum Numbers are n = 7; l = 0; ml = 0; ms = +1/2

(d) The full set of Quantum Numbers are n = 2; l = 1; ml = 0; ms = +1/2

Quantum Numbers is a set of numbers used to describe the position and energy of the electron in an atom. There are four quantum numbers namely, principal (n) , azimuthal(l), magnetic (ml) and spin quantum numbers (ms) .

(a) Potassium has atomic no Z=19

Electronic configuration of potassium= 1s² 2s²2p⁶ 3s² 4s¹

Outermost electron = 4s¹

n= 4 , l=0 since the outermost electron is in s orbital

and ml can change from -l to +l but if l= 0 because it is an s-orbital then ml must be zero too; m=0

ms can be either +1/2 or -1/2 depending on yhe spin of electron, it does not matter in this case. So, ms= =1/2

The full set of Quantum Numbers are n=4, l=0, ml=0, ms=+1/

(b) Bromine has atomic number Z= 35 and Br⁻ has atomic number= 36

Electronic configuration for bromine when an electron is gained

= (Ar) 3d¹⁰ 4s² 4p⁶

The electron the bromine atom gains to form bromide makes bromide have the same electronic configuration as the neon gas krypton. Krypton's electron configuration ends in 4p⁶. . The 4 is the n-value and the l-value is 1, which is a p-orbital. Since the p-orbital is filled, the last subshell ml  is filled and it has a value of +1. The last electron filled in an orbital always has an ms = -1/2

The full set of  quantum numbers are; n=4 , l= 1, ml=  1, ms= -1/2

(c) Fr has an atomic number = 87 ( Rn)7s¹

Electronic configuration for an electron lost in Fr atom=  1s² 2s²2p⁶ 3s²3p⁶ 3d¹⁰4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹

Therefore,  for lost electron the outermost electron is in 7s⁰ shell.

n= 7, l=0 as the outermost electron is in s orbital and therfore ml= 0 ans ms= +1/2

Full set of quantum numbers are n = 7; l = 0; ml = 0; ms = +1/2

(d) carbon has atomic number Z=6

Electronic configuration = 1s² 2s² 2p²

In the ground state highest energy principal quantum no n=2

l= 1 as electron is in p orbital , ml=0 and ms= +1/2

 full set of quantum numbers are= n = 2; l = 1; ml = 0; ms = +1/2

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.

It is important to understand racial trends in American Society as it helps in understanding the society better.

A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.

Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.

It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.

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The true statement about Matter is that matter is anything that is made up of atoms and that has mass.

Matter is anything which is made up of mass and that has mass. and that occupies space.

If we talk about space, there is no matter because there is nothing but vacuum.

Matter is a general terms given to a group of atoms or molecules which are taken in a general.

We all are made up of atoms, because we al have mass and we all occupy some space. The same goes to anything that we can see or touch or feel that it exist.

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Answer: Matter is anything that is made of atoms and that has mass.

Explanation: I took the test.

Answer:

HS is stripped from each O.

Answer:

12.

Explanation:

Beryllium is in Group 2 (Column 2) with the atomic number 4.

The atomic number to the next element in the group would be right below it, Magnesium (Mg). Magnesium has an atomic number 12.

The atomic number is the small number on the top left corner of the square of the element.

What's phase diagram?

The phase diagram is a pressure vs temperature sketch. On the graph, the different physical states of any system at variable temperature and pressure are shown.

What's a Triple point?

A triple point is the point on a phase diagram where all three states of a system (solid, liquid, and gas) are in equilibrium.

What's a Critical point?

A critical point is that point on the phase diagram where the boundary between the liquid phase and gaseous phase vanishes away.

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Answer:

a buffalo

Explanation: if its north America it needs to be native from here none of the other are from north America

The main assumption to make is that the density of 5% vinegar is equal to the density of water. Then, for the purposes of the calculation, it is easiest to assume a certain volume of 5% vinegar is used. With these assumptions, we can calculate that the molarity of the solution is 0.83 M.

To calculate the molarity (c) of the solution, we need the number of moles (n) of solute and the volume (V) of the solution:

c = n/V

If we assume that we have 100 mL of 5% vinegar and that its density (d = 1.00 g/mL) is equal to the density of water, we can calculate the mass of the solution (m) using its density and volume (V = 100 mL = 0.100 L):

d = m/V ⇒ m = d*V

m = 1.00 g/mL * 100 mL

m = 100 g

Now we can use the mass and mass percentage (%m = 5% = 0.05) to calculate the mass of acetic acid (AcOH) present:

m(AcOH) = %m * m(solution)

m(AcOH) = 0.05 * 100 g

m(AcOH) = 5 g

Using the mass of AcOH we can calculate the number of moles (n) present by using the molar mass of AcOH (M = 60 g/mol):

n = m/M

n = 5 g / 60 g/mol

n = 0.083 mol

Finally, we calculate the molarity:

c = 0.083 mol / 0.1 L

c = 0.83 M

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4°c, the temperature of maximum density for water.

Below that point, the crystalline lattice starts to form and the water begins to expand. The density decreases above that temperature as a result of the elevated molecular vibrational activity.

Temperature is a numerical expression of how hot a substance or radiation is. There are three different kinds of temperature scales: those that depend only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; those that depend only on practical empirical properties of particulate matter rather than theoretical principles; and those that depend on the average translational kinetic energy per freely moving microscopic particle, such as an atom, molecule, or electron, in a body, like the SI scale.

A thermometer is used to determine temperature. It is calibrated using a variety of temperature scales, each of which has a distinct historical definition determined by a specific set of reference points and thermometric materials. The Celsius scale is the most widely used scale.

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A Sample of propane, a component of LP gas has a volume of 35.3L at 315K and 922torr. Its volume at STP is 37.6 L.

STP conditions are defined as a pressure of

100kPa= 100kPa.  1atm / 101  . 325kPa   . 760torr/1atm

= 750.1torr

And a temperature of 0ەC = 0ەC +273.15= 273.15K

So, from here we knew that both pressure and temperature of the gas are changing. Here we use combined gas law equation.

The combined gas law is an amalgamation of the three previously known laws which are Boyle’s law PV = K, Charles law V/T = K, and Gay-Lussac’s law P/T = K. Therefore, the formula of combined gas law is PV/T = K,   Where P = pressure, T = temperature, V = volume, K is constant.

P1V1/T1 = P2V2/T2

Here P1, V1 and T1 are the pressure volume and temperature of the gas at an initial stage.

And P2, V2 and T2 are pressure volume and temperature of the gas at final stage.

So,

  P1V1/T1 = P2V2/T2

= > V2 = (  P1 .T2 /P2.T1).V1

Put all values in the expression.

  V2 = (922torr . 273.15K /750.1torr . 315K ) . 35.3L

        =   37.6 L

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Answer:Dmitri Mendeleev

Explanation:

Answer:

physical change

Explanation:

melting is a physical change, a physical change does not involve a change in chemical bonds.

The disadvantage of increasing our use of solar energy is that unfortunately currently, the production and storage of solar energy is bit as cost efficient when compared to obtaining the same quantity of energy from fossil fuels.



Sample 1 is you predict greater alcohol production.

The electron transport chain produces the majority of ATP from all three major phases of cellular respiration. Metabolism is the chemical reaction within the body's cells that convert food into energy. Our bodies need this energy to do everything from moving to thinking to growing. Certain proteins in the body control metabolic chemical reactions.

The compound that produces the most ATP when fully oxidized is glucose. Glycolysis and aerobic oxidation of glucose by the TCA cycle generate 32 ATP. However, the acetyl-CoA molecule can not enter glycolysis. Cellular respiration that occurs without oxygen is anaerobic respiration. Cellular respiration that occurs in the presence of oxygen is aerobic respiration.

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Answer:

5, the last would be incomplete

Explanation:

The first, inner cloud has 2 electrons, then 8, then 8, then 8, then 3.

(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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Answer

B. 11.2 grams

Explanation:

Molar mass of CaCl = 110.98 g/mol

Molar mass of KCl = 74.5513 g/mol

From the balanced chemical equation of the reaction given;

1 mole CaCl produced 2 moles KCl.

In grams;

(1 mol x 110.98 g/mol) CaCl produce (2 mol x 74.5513 g/mol) KCl, i.e

110.98 g CaCl produced 149.10236 g KCl,

Therefore, the grams of CaCl needed to produce 15.0 g KCl will be:

Therefore, 11.2 grams of calcium chloride are needed to produce 15.0 g of potassium chloride.

The mass of the 13 cm³ of copper, given that 100 cm³ of it has a mass of 890 g is 115.7 g

We'll begin by obtainig the density of the copper. This can be obtained as illustrated below:

Density = mass / volume

Density of copper = 890 / 100

Density of copper = 8.9 g/cm³

Finally, we shall determine the mass of the 13 cm³ of copper. This is obatined as follow:

Density = mass / volume

Cross multiply

Mass = Density × volume

Mass of copper = 8.9 × 13

Mass of copper = 115.7 g

Thus, the mass of the copper is 115.7 g

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The mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

Mass is defined as a dimensionless number used to describe the mass of a particle or item.

We'll start by finding out how dense copper is.

Given, Volume = 100 cm³

           Mass = 890 g

Density = Mass / Volume

             = 890 g / 100 cm³

             = 8.9 g/cm³

Now to determine mass is 13 cm³ of copper is

Density = Mass / Volume

So, Mass = Density x Volume

               = 8.9 g/cm³ x 13 cm³

               = 115.7 grams

Thus, the mass of 13 cm³ of copper with a volume of 100 cm³ has a mass of 890 g is 115.7 grams.

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Isotopes are atoms of an element with the same number of protons but a different number of neutrons.

Isotopes are different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers or atomic masses.

Stable and unstable isotopes are the two basic categories of isotopes. 254 stable isotopes are known. Scientists refer to all synthetic (lab-made) isotopes as radioisotopes since they are radioactive due to their instability.

Examples of isotopes include carbon 12, which has 6 neutrons, carbon 13, which has 7 neutrons, and carbon 14, which has 8 neutrons. Carbon 14 is the radioactive isotope while the rest are stable.

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25 ml of the solution contains 4.83 x 10⁻⁴ moles of CaCl₂.

Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.

The concentration of the CaCl₂ solution is 0.0193 M.

Hence, there are 0.0193 moles of CaCl₂ per liter of the solution.

M = 0.0193 M

volume of solution = 25 ml

Multiply the volume by the concentration to get the number of moles.

M = moles of solute / volume of solution

moles of solute = M (volume of solution)

moles of solute = 0.0193 M(25 ml)(1 L / 1000 ml)

moles of solute = 4.83 x 10⁻⁴

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Answer: There is equal number of each type of atom on the reactant and product side.

Explanation: