The chemical formula for octane is: ch3ch26ch3 calculate the molar mass of octane. round your answer to 1 decimal place.

Answer:

See explanation

Explanation:

Atomic size increases down the group due to the addition of more shells.

As more shells are added and repulsion of inner electrons become more significant, atomic size increases down the group. However, across the period, atomic size decreases due to increase in effective nuclear charge without any increase in the number of shells. This causes increased attraction between the nucleus and the outermost shell thereby decreasing the size of the atom.

Ionization energy decreases down the group because the outermost electron is more shielded by inner electrons making it easier for this outermost electron to be lost. Across the period, ionization energy increases due to increase in effective nuclear charge which makes it more difficult to remove the outermost electron due to increased nuclear attraction.

Answer:

Sugar can be obtained by evaporation.

Filtering wont work because sugar is soluble in water thus will mix to form one layer.

The molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

The molar solubility of Na3PO4 can be determined using the solubility product constant (Ksp) expression for the dissociation reaction of Na3PO4:
Na3PO4(s) ⇌ 3Na+(aq) + PO43-(aq)
Ksp = [Na+]^3[PO43-]
Since the solution is saturated, the concentration of Na+ is given as 0.30 M. Therefore, we can substitute this value into the Ksp expression and solve for the molar solubility (x) of Na3PO4:
Ksp = (0.30 M)^3 (x)
Simplifying the expression, we get:
Ksp = 0.027x
Rearranging the equation, we can solve for x:
x = Ksp / 0.027
The value of Ksp for Na3PO4 is 2.7 x 10^-28 (at 25°C), so substituting this value into the equation gives:
x = (2.7 x 10^-28) / 0.027
x = 1.0 x 10^-26 M
Therefore, the molar solubility of Na3PO4 in a saturated solution where [Na+] = 0.30 M is 1.0 x 10^-26 M.

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The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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The volume would be explanation times explanation because the explanation is the explanation

Explanation:

Answer:

\(\boxed {\boxed {\sf v=12 \ mL}}\)

Explanation:

Grace found the volume of the rock using water displacement.

To calculate the volume, we must subtract the initial volume from the final volume.

\(v_f-v_i\)

The initial or original volume is 20 milliliters.

The final or new volume, after the rock is added to the water, is 32 milliliters.

\(v_f=32 \ mL\\v_i=20\ mL\)

Substitute the values into the formula and subtract.

\(32 \ mL-20 \ mL\)

\(12 \ mL\)

The volume of the rock is 12 milliliters.

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

Geographic features such as mountain ranges, coastlines, and human-modified land can cause air pollutants to concentrate or disperse in a given area. However, the types and quantities of pollutants in the air have a far greater impact on air quality.

A pollutant is a substance or energy introduced into the environment that has unintended consequences or reduces the utility of a resource. Pollutants that can be both naturally occurring and anthropogenic in origin include carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (also known as particulate matter), and sulfur oxides.

Elevated atmospheric pressure and circulation changes may affect the movement of air pollutants and air pollution concentrations at a given location. Pollutants move through the atmosphere due to transport, dispersion, and deposition. The movement caused by a time-averaged wind flow is referred to as transport. Dispersion is caused by local turbulence, or motions that last less than the time required to average the transport.

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160 ml of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

We can use the idea of ​​percent concentration to determine how many grams of amino acids are present in 160 mL of a 4.0% (m/v) amino acid solution. Expressed by the mass percent concentration of the solute (amino acid) per 100 ml of solution. Since the solution in this example is 4.0% (m/v), 100 mL of solution contains 4.0 g of the amino acid.

We can make a ratio to determine how many grams are in 160 ml:

4.0 grams / 100 ml = x grams / 160 ml

When we cross multiply for x, we get:

x = (4.0 grams / 100 ml) * 160 ml

x = (0.04) * 160

x = 6.4 grams

Consequently, 160 mL of a 4.0% (m/v) amino acid solution contains 6.4 g of amino acids.

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Answer:

1)physical change

Explanation:

2)chemical change

Answer:

The sun uses nuclear fusion reactions to generate heat.

Explanation:

It is true from the given choices that the sun uses nuclear fusion reactions to generate heat.

The heat that accompanies nuclear fusion reactions is very huge. In fact this is the source of energy for the whole solar system.

During a nuclear fusion reaction, small atomic nuclei combines to form larger ones.

This combination results in a series of chain reactions that releases energy.

Answer:

used for making sari obtained from animal is silk

The hybridization of the central atom in SF4 is sp3d since we have five regions of electron density in SF4.

To determine the hybridization of the central atom in SF4 (sulfur tetrafluoride), we need to count the number of regions of electron density around the central atom. These regions can be in the form of bonded atoms or lone pairs.

In SF4, sulfur (S) is the central atom, and it is bonded to four fluorine (F) atoms. Additionally, sulfur has one lone pair of electrons.

The total number of regions of electron density is determined by the sum of bonded atoms and lone pairs. In this case, we have four bonded regions (S-F bonds) and one lone pair region.

Based on the number of regions of electron density, the hybridization of the central atom can be determined as follows:

2 regions of electron density → sp hybridization

3 regions of electron density → sp2 hybridization

4 regions of electron density → sp3 hybridization

5 regions of electron density → sp3d hybridization

Since we have five regions of electron density in SF4 (four bonded atoms and one lone pair), the hybridization of the central atom (sulfur) is sp3d. The hybridization of the central atom (sulfur) in SF4 is sp3d.

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Answer:

The plasmodial slime molds are the kind of protist that can live in groups in which different individuals perform different jobs. Some kinds of bacterial cell walls also have other functions.

No, condensing ethanol would not have the same effect on increasing the yield in NH3 production as condensing NH3, as ethanol is not involved in a gaseous equilibrium.

Condensing ethanol would not have the same effect on increasing the yield in NH3 production as condensing NH3. In NH3 production, the yield is increased by removing NH3 as it is a gas at standard conditions.

By condensing NH3 and removing it from the reaction mixture, the equilibrium is shifted towards NH3 production, leading to a higher yield.

Ethanol, on the other hand, is a liquid at standard conditions and not involved in a gaseous equilibrium in the same way as NH3. Condensing ethanol would not affect the equilibrium of an NH3 production reaction in the same manner as condensing NH3.

The presence or removal of ethanol would likely have a minimal impact on the yield of NH3.

In NH3 production processes, the focus is on optimizing reaction conditions and catalysts to favor NH3 formation. Manipulating the concentration of reactants, temperature, and pressure are common strategies to improve the yield of NH3.

While removing ethanol may help maintain reactant concentration, its condensation alone would not directly contribute to increasing the yield of NH3.

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Electronegativity across a period: increases.

Electronegativity down a group: decreases.

Explanation:

Just did on Edge 2021

Electronegativity across a period increases and Electronegativity down a group decreases.

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.

As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Hence, Electronegativity across a period increases and Electronegativity down a group decreases.

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Answer:

Eutrophication is the enrichment of a body of water with excessive nutrients (nitrogen and phosphorus), which causes algal growth and subsequent decline of dissolved oxygen after decomposition.

Answer:

Chemistry with Mr.B? me too!

a) 0/17moles

b)1.02x10^23

c) 1.12 x 10^25

Is this correct

Explanation:

Use:

n = m/M

N= n x NA

calculate atoms in C3H8 = 11

The number of moles, molecules and atoms of propane present in 7.35g of sample is 0.166mol, 9.9×10²² molecules & 1.089 × 10²⁰ respectively.

Moles will be calculated by using the below formula as:

n = W/M, where

W = given mass

M = molar mass

n = 7.35g / 44.1g/mol = 0.166mol

In 0.166 mol = (0.166mol)(6.022×10²³ molecules/mol) = 9.9×10²² molecules of propane are present.

No. of atoms = (11)(9.9×10²²) = 1.089 × 10²⁰

Hence 0.166 mole of propane is present in 7.35 grams of sample.

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Answer:

6

Explanation:

Answer:

How are large polymers formed? by repetitive combinations of simple subunits by the addition of halogens to a small molecule by combining a few different and larger molecules by combining many different and smaller molecules

Explanation:

1) Vapor pressure. Water exerts vapor pressure. This pressure is produced by the water molecules that change their state from liquid to gas.

2) Setting a similar system and watching what happens.

If we set a system similar to that shown in the image (place the cup of water in the jar and then close the jar), we will see the following

1) The big jar has no molecules of water gas since we just closed it.

2) Some water molecules change from liquid to gas and start filling the big jar.

3) The big jar will have a certain amount of vapor water.

4) The big jar has so much water that it starts condensing on the walls of the big jar.

5) After enough water is condensed on the walls, it runs down the walls and precipitates.

3) The order observed.

1) Water evaporated from the cup

2) water condensed on the walls of the jar.

3) Water precipitated, or ran down the walls of the jar.

Answer:

it has oxidized because it has has given out 2 ions

Answer:

Oxidised

Explanation:

Mg -------> Mg2+ +2electrons

In this case Mg loses two electrons and loss of electron is oxidation so Mg oxidised.

Answer: 2.04

Explanation:

Answer:

Approximately \(0.821\; \rm mol\).

Explanation:

Look up the relative atomic mass of \(\rm Ba\), \(\rm O\), and \(\rm H\) on a modern periodic table:

Calculate the formula mass of \({\rm Ba(OH)_2}\):

\(\begin{aligned}& M({\rm Ba(OH)_2}) \\ &= 137.327 + 2\times(15.999 + 1.008) \\ &\approx 171.334\; \rm g \cdot mol^{-1}\end{aligned}\).

Calculate the number of moles of \({\rm Ba(OH)_2}\) formula units in that \(235\; \rm g\) of this compound:

\(\begin{aligned}& n({\rm Ba(OH)_2}) \\ &= \frac{m({\rm Ba(OH)_2})}{M({\rm Ba(OH)_2})} \\ &= \frac{235\; \rm g}{171.334\; \rm g \cdot mol^{-1}} \approx 1.37159\; \rm mol \end{aligned}\).

Calculate the volume of a \(c({\rm Ba(OH)_2}) = 1.67\; \rm mol \cdot L^{-1}\) with approximately \(n({\rm Ba(OH)_2}) = 1.37159\; \rm mol\) of the solute:

\(\begin{aligned}& V({\rm Ba(OH)_2}) \\ &= \frac{n({\rm Ba(OH)_2})}{c({\rm Ba(OH)_2})} \\ &= \frac{1.37159\; \rm mol}{1.67\; \rm mol \cdot L^{-1}} \approx 0.821\; \rm L \end{aligned}\).

Answer : b. mixture

Element and compound are included in pure substance where the composition is the same in each part

Elements are made up of 1 type of atom, while the compounds of 2 or more types of atoms , both can be represented in the form of chemical symbols

A mixture is a combination of substances. The properties of a substance in the mixture component are unchanged

The mixture can be a homogeneous mixture or a heterogeneous mixture

Solution including into Homogeneous mixture, while suspension into a heterogeneous mixture

So a term that could refer to heterogeneous matter : b. mixture

Answer: 8/9

Explanation: took the quiz gang

Answer:

Cannot, two

Explanation:

The component elements of a compound can only be separated via a chemical reaction that breaks the atomic bonds that bind its molecules. Also, compounds are formed by 2 or more different elements.

The monomer of the PVC polymer shown below is vinyl chloride. A monomer is a molecule that can be bonded to other identical molecules to form a polymer. In the case of PVC, the monomer vinyl chloride is bonded together to form the polymer polyvinyl chloride.

The structure of the vinyl chloride monomer is shown below:

CH2=CHCl

The double bond between the two carbon atoms allows for the monomer to bond with other vinyl chloride monomers to form the polymer PVC. The chlorine atom attached to one of the carbon atoms is what gives PVC its unique properties, such as its durability and resistance to water.

In summary, the monomer of the PVC polymer is vinyl chloride, which has the structure CH2=CHCl. This monomer is bonded together to form the polymer polyvinyl chloride, which is commonly used for water pipes and synthetic leather.

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Answer:

D A and B that is the answer

4.01 grams of Licl are needed to release this amount of heat

The gram is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogram. It was originally known as the gramme. Gram. This pen cap weighs around one gram. A weight scale like this one may provide a precise mass readout for many different things.

Mass of Licl required to release 5850J of heat to the surroundings.

Let x g Licl required.

Then x g ×∆H = 5850J

x g × 1.46 × 10³ = 5850

x = 5850/ 1.46 × 10³

x = 4.0068

so 4.01g Licl required.

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The given problem involves comparing the measured pH of an initial HCl solution to the calculated pH value. Specifically, we are asked to determine how the measured pH compares to the calculated pH value for the initial HCl solution.

To compare the measured pH to the calculated pH value, we need to use the equation for pH, which relates the concentration of hydrogen ions in a solution to the pH value.

By measuring the pH of the initial HCl solution and calculating the pH value using the known concentration of HCl, we can compare the two values to determine if they are in agreement.Using the given information, we can calculate the expected pH of the initial HCl solution and compare it to the measured pH value using appropriate statistical methods.The final answer will be a statement or conclusion about how the measured pH compares to the calculated pH value for the initial HCl solution.

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