Help me please!


The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one third of its original pressure and its absolute temperature is decreased by one half. What is the final volume of the gas?

The trend which depicts the reactivity of most nonmetals show in a periodic table is that it  increases from left to right across the periodic table and is denoted as option C.

This is referred to as the tabular arrangement of elements into groups and periods which is according to their similar features such as reactivity, number of electron shells etc.

When considering the periodic table, the reactivity of most nonmetals such as oxygen decreases top down within groups and increases from left to right across period which is therefore the reason why it was chosen as the most correct choice.

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Answer:

B

Explanation:

c isnt right

By using the Henderson-Hasselbalch equation, we can calculate that the concentration of acetic acid in the given buffer is 57.5 mM.

When calculating the pH value of a buffer system, we use the Henderson-Hasselbalch equation:

[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]

pKa - the negative logarithm of the acidic constant (for acetic acid, pKa = 4.76)

[base] - concentration of the basic (sodium acetate) component

[acid] - concentration of the acidic (acetic acid, AcOH) component

If we plug the known values (pH = 5; [base] = 100 mM; pKa = 4.76) in the equation we get:

[tex]5 = 4.76 + log\frac{100 mM}{[AcOH]}[/tex]

[tex]log\frac{100 mM}{[AcOH]} = 5-4.76[/tex]

[tex]log\frac{100 mM}{[AcOH]} = 0.24[/tex]

[tex]\frac{100 mM}{[AcOH]}= 10^{0.24}[/tex]

[tex]\frac{100 mM}{[AcOH]}= 1.74[/tex]

[AcOH] = 100 mM / 1.74

[AcOH] = 57.5 mM

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Factors influence bond lengths are smaller atoms have shorter bond lengths. double bonds are shorter and stronger than single bonds.

Bond order, or the number of chemical bonds between a pair of atoms, is a measure of a bond's stability. For instance, the bond order in diatomic nitrogen, NN, is 3, while in acetylene, HCCH, the carbon-carbon bond order is also 3, while the CH bond order is 1. Bond type and bond strength are determined by bond order and length between atoms. The relationship between bond order and length is inverse: as bond order rises, bond length falls.

When two atoms come together to form a molecule, their electrons join forces by fusing into gaps in one another's orbital shells.

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There are two chiral centers in the ethambutol molecule, but only three possible stereoisomers (structures attached below).

In general, the number of stereoisomers of a chiral molecule is 2ⁿ, where n is the number of chiral centers, so for ethambutol it should be 2² = 4. However, if the molecule is symmetrical (in this case it has a plane of symmetry), then there is an R,S-isomer that is not optically active as a whole because the chiral centers cancel each other out. This is a so-called meso-isomer. So, in the end, we have two enantiomers (R,R- and S,S-) and a meso-isomer, giving us three stereoisomers in total.

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Answer:

I don't know why 27.6 g is not the correct answer.  I believe that it is correct.

27.6 grams of [tex]H_{2}[/tex].

Explanation:

The balanced equation tells us that 17 moles of hydrogen will react completely with 8 moles of carbon monoxide.  That is a molar ratio of 17/8 moles H2/molesCO.

If we start with 6.5 moles of CO, we need:

(6.5 moles CO)*(17/8 moles H2/moles CO) = 13.8 moles of H2 (3 sig figs)

Convert 13.8 moles of H2 into grams H2 by multiplying by the molar mass iof H2 (2g/mole):

(13.8 moles H2)*(2 g H2/mole H2) = 27.6 grams of [tex]H_{2}[/tex].

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

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.

Answer:

the answer is C.Distilled or deionized water.

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Potassium have three isotopes.

254 stable isotopes are known.  Certain substances can only exist in unstable states (for example, uranium).

The stable potassium isotope has a nuclear spin of 3/2, a relative atomic mass of 38.963707, and a natural abundance of 93.3 atoms.

We must compute for the various atomic weights of the isotopes since potassium has three distinct isotopes: Potassium-39 has an atomic mass of 39 and 19 protons. Therefore, the number of neutrons is 39 – 19, or 20.

If potassium has an atomic mass of 39.0983, the average is obviously highly biassed in favour of potassium-39, making potassium-39 the isotope with the greatest abundance.

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The Water does not dissolve sand, but it does dissolve sugar. In order to dissolve the mixture in water. Sand will settle and sugar and water will separated combine to produce a solution.

Sugar can be obtained by the crystallization, while sand can be filtered and separated. The Filtration and evaporation can be used to separate the salt and sand mixture. Sand can be separated by filtering a mixture of sand and salt solution (salt dissolved in water). After filtering, sand remains as a residue on the filter paper. Now it is possible to make common salt by boiling the filtrate.

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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.



If a  sample of metal has a mass of 2272 grams. Its dimensions are 5 cm by 5 cm by 8 cm, then the density of the sample of the metal would be 11.36 grams / centimeter³.

It can be defined as the mass of any object or body per unit volume of the particular object or body.

ρ = mass / volume

As given in the problem sample of metal has a mass of 2272 grams. Its dimensions are 5 cm by 5 cm by 8 cm.

The density of the metal  = 2272 / (5 × 5× 8)

                                         = 11.36 gram / cm³

Thus, the density of the metal would be 11.36 grams / cm³.

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The reason for the standardization of sodium hydroxide is that the compound is deliquescent.

The term standardization has to do with the process by which the concentration of the sodium hydroxide is determined. We know that there are some compounds that we do not need to standardize before they are used. The solid is just dissolved and made up to mark and then the solution thus prepared could be used in the standardization of other solutions.

However, this is not the case for sodium hydroxide because the compound in itself is deliquescent. This means that the solid is able to absorb moisture hence we can not get the actual amount of the sodium hydroxide by merely weighing the solid.

As such, we can be able to obtain the concentration of the sodium hydroxide by standardizing it using a primary standard.

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A good test for calcite is the test using acid and a rock formation that contains calcite is limestone.

We know that rock has to do with a solid mass that contains minerals. We know that many rocks are composed of various kinds of minerals that could be found inside the rocks. One of the minerals that could be found in rock is calcite which is composed of calcium carbonate. The presence of calcite can be tested by that addition of an acid which leads to the effervescence of a colorless odorless gas.

The rock formations that contain calcite are mainly limestone and and are known for their grey or white color.

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Explanation:

A. Even though CH3F has a tetrahedral geometry, the molecule is not symmetric due to the presence of the fluorine atom in the structure resulting in the molecule being polar.

B. None of the above gives a valid explanation.

C. Even though CH3F has a tetrahedral geometry, the carbon atom in the molecule, being the central atom, is more electronegative than the hydrogen and fluorine atoms in the molecule resulting in the molecule being polar.

D. Even though CH3F has a tetrahedral geometry, the fluorine atom in the molecule, being the central atom, is more electronegative than the hydrogen and carbon atoms in the molecule resulting in the molecule being polar.

E. Even though CH3F has a tetrahedral geometry, the hydrogen atoms in the molecule are more electronegative than the fluorine resulting in the molecule being polar.

The rate of a reaction indicates how fast the products are formed or how fast the reactants are consumed. Option A.

The reaction rate or rate of reaction is the rate at which a chemical reaction occurs and is defined as proportional to the increase in the concentration of products per unit of time and the decrease in the concentration of reactants per unit of time. Reaction rates vary greatly. The reaction rate is the rate at which a reaction reaches equilibrium.

In enzyme-catalyzed reactions, the rate is usually expressed as the amount of product produced per minute. The reaction rate is determined by the energy barrier between the reaction and the products. Reaction rate indicates the speed of reaction. That is how quickly reactants are consumed, how quickly products are formed, or how quickly energy is absorbed or released. Reaction speed is a powerful diagnostic tool. By understanding the speed at which products are made and the causes of slow reactions.

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Answer:

Explanation:

Here, we want to calculate the percentage yield of the reaction

Mathematically, we have that as:

The mass of the product NO given in the question is the actual yield which is 27.50 g

Now, let us get the theoretical yield

We find the number of moles of nitrogen gas that reacted

Mathematically, that is the mass of nitrogen gas divided by the molar mass

The molar mass of the nitrogen gas is 28 g/mol

The number of moles is thus:

From the equation of reaction, 1 mole of N2 yields 2 moles of NO

Thus, 0.5814 mol of N2 will yield:

Now, to get the mass of NO produced, we multiply this number of moles by the molar mass of NO

The molar mass of NO is 30 g/mol

The mass that was produced is thus:

Finally, we have the percentage yield as:

The concentration of so2 emitted on a hg/m3 basis is 0.01 M.

Concentration is the abundance of a constituent divided through the full extent of an aggregate. several styles of mathematical description can be distinguished: mass attention, molar awareness, range attention, and quantity attention.

Given the 5 ppmv SO2 and we need to calculate the concentration of SO2 emitted on a µg /m3 basis.

We know,

mg/m3 = ppmv * M/0.08205*T

M = molecular weight of gas = 64.064 g/mol

mg/m3 = 5 ppmv *64.064 g.mol-1/ 0.08205 * 273.15 K

  = 14.28 mg/m3

Now we know

1 mg = 1000 µg

So, 14.258 mg =?

= 14280 µg/m3

We are given partial pressure. P = 0.1 atm.

Henry’s law constant =  0.1 mole/(liter.atm)

C = Kh*P

 = 0.10 mol/L.atm * 0.10 atm

  = 0.01 mol/L

    = 0.01 M

So, the equilibrium concentration of a gas in water is 0.01 M.

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The following which are medical applications of radiation include the following below:

This is referred to as the transmission of energy through space and it usually occurs at the speed of light thereby making it a very fast method of heat transfer when compared to the others. Radiation are used for various purposes such as immigration for searching luggage etc.

It is also used for medical reasons such as cancer therapy as the radiation help in destroying the cancerous cells thereby making it easy for their removal from the body system. It is also used for genetic engineering in the creation of new types of substances through the modification of nucleic acids such as DNA etc.

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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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The isotopes of the element X are; 19/9X, 20/9X and 21/9X.

The term isotopes has to do with the atoms that have the same atomic number but they do not have or posses the same mass number. The implication of this definition is that the atoms that we call the isotopes are different in the number of the neutrons that they do contain.

Now we know that the common thread that holds the atoms that we call an isotope of each other is that they have the same atomic umber and the atomic number of the atom X in this case is 9.

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Answer: This may seem unlikely for whereever you're living but say if a drought happened in your country and water is very limited, then we'd have to import water from other countries but if their water is unclean then we also have a problem of no water. Most bottled water sold in stores comes from other countries aswell.

Avogadro's Number:

Avogadro's number, which is equal to 6.02214076 x [tex]10^{23}[/tex], is the quantity of units in one mole of any material. Hence, 1 mole of HBrO3 will contain

6.02214076 x [tex]10^{23}[/tex] atoms.

Then, 0.009567 mole of HBrO3 will contain

= 0.009567 moles x 6.02214076 x [tex]10^{23}[/tex] atoms

=  0.0576138 x    [tex]10^{23}[/tex]  atoms = 5.761 x [tex]10^{21}[/tex] atoms.

Hence, 0.009567 mole of HBrO3 will contain 5.761 x [tex]10^{21}[/tex] atoms.

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Answer:

Cutting hair is a physical change since it doesn't change the substance its still hair

bending a paper clips since it's also the same substance

Ice cube melting

Explanation:

All of these are physical change since there reversible and they all still stay the same substance

In this question, we need to determine what will be the nuclear equation for the Beta decay of Lead - 210.

Beta decay is a type of radioactive decay in which we will have either a neutron becoming a proton, this will be called Beta-minus decay or a proton becoming a neutron, this will be called a Beta-plus decay

In the case of Pb-210, we will have a Beta-minus decay, and one neutron will become a proton:

210/82 Pb ---> 210/83 Bi + electron

Lead - 210 will become Bismuth - 210

Sodium is highly electropositive thus it can easily give out one electron from the outermost shell of the atom of the element.

We know that sodium is an element that has been found to be a member of group one of the periodic table. This implies that the sodium has only one electron in the outermost shell of the atom. As such, the sodium atom is quite very reactive and we observe that the sodium atom does loose electron easily.

The elements that are in the first group of the periodic table are highly electropositive and  this is what informs the fact they have a tendency to loose electrons quickly.

When the sodium atom looses an electron, it forms a univalent positive ion and there is a loss of an entire shell and this is why we find out that sodium does not occur in a free sate in nature owing to the fact that it tends to react very much.

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The kilojoules of heat released per gram of the compound reacted with oxygen is -72.052 kj/g

The standard enthalpy of formation is a measure of the strength launched or fed on while one mole of a substance is created under trendy situations from its natural elements. The symbol of the standard enthalpy of formation is ΔH f. = A degree means that it's a fashionable enthalpy change.

Enthalpy of a formation refers to the trade in enthalpy for the formation of one mole of a substance from the maximum solid form of its constituent factors. change in enthalpy is symbolized by means of delta H and the f stands for formation.

Given,

compound             ΔH°f

B₅H₉                       73.2

B₂O₃                       -1271.94

H₂O                        -285.83

Balanced chemical equation:-

2B₅H₉  (l)  +  12O₂ +(g) => 5B₂O₃  + 9H₂O(l)

From Hess's law

ΔH°min = Σ enthalpies of products - Σ enthalpies of reactants

             = 5× (-1271.94) + 9×( -285.83) - 2(73.2) kj/mol

ΔH°min = -9078.59 kj/mol

It is seen that 2 moles of B₅H₉    react with O₂ is  -9078.59 kj/mol

For 1 mole = -9078.59 kj/mol/2

                 = 4539.295 KJ/mol

The energy released per gram = energy released per mol/molar mass of B₅H₉

                                            = 4539.295 kj/mol/63 g/mol

energy released per gram = -72.052 kj/g

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The pH of the solution after 28.0 ml of NaOH have been added to the acid exists 0.85.

The balanced reaction between base and acid exists;

NaOH + HCl → NaCl + H₂O

NaOH exists a strong base and HCl exists a strong acid therefore complete dissociation. Stoichiometry of acid to base exists 1: 1.

The number of moles of base added - 0.5 M /1000 mL/L × 28.0 mL = 0.014 mol

the number of acid moles present - 0.5 M /1000 mL/L × 50.0 mL = 0.025 mol.

acid reacts with base 1: 1 ratio

Therefore excess amount of acid present - 0.025 - 0.014 = 0.011 mol

Total volume = 50.0 + 28.0 = 78.0 mL

[H⁺] = 0.011 mol/0.078 L = 0.14 M

Therefore, pH = -log [H⁺]

substitute the values in the above equation, we get

pH = -log(0.14)

simplifying the above equation, we get

pH = 0.85.

Therefore, the pH of the solution after 28.0 ml of NaOH have been added to the acid exists 0.85.

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The conversion of solar energy into the chemical energy of a carbohydrate occurs during the process of photosynthesis.

Certain organisms convert solar energy (sunlight) into chemical energy through photosynthesis, which is then used to construct carbohydrate molecules. When an organism breaks down food, the energy that was used to keep these molecules together is released.

The energy generated by photosynthesis continuously enters the planet's ecosystems and is transferred from one organism to another. As a result, the majority of the energy that all living things on Earth require comes from the process of photosynthesis, either directly or indirectly.

Oxygen is also released into the atmosphere as a result of photosynthesis. To summarize, humans rely almost entirely on photosynthesis-producing organisms for food and oxygen.

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