[please answer fast!] If the hydroxide ion concentration is 2x10^-3 M, what is the pH of the solution? Show your working.

Answer:

0.702 L H₂O

Explanation:

To find the volume of water needed to dilute the stock solution, you need to (1) find the moles of the stock solution (via molarity formula), then (2) find the volume of the diluted solution (via molarity formula), and then (3) find the volume of water needed.

(Step 1)

Molarity (M) = moles / volume (L)                 <----- Molarity formula

5 M = moles / 0.500 L                                  <----- Insert values

2.5 = moles HCl                                           <----- Multiply both sides by 0.500

(Step 2)

Molarity = moles / volume                           <----- Molarity formula

2.08 M = 2.5 moles / volume                      <----- Insert values

(2.08 M) x volume = 2.5 moles                   <----- Multiply both sides by volume

volume = 1.20 L                                           <----- Divide both sides by 2.08

(Step 3)

Diluted Volume = 1.20 L

Stock Volume = 0.500 L

Water Volume = ? L

Diluted Volume = Stock Volume + Water Volume

1.20 L =  0.500 L + Water Volume

0.702 L = Water Volume

When enzyme activity rate has reached stability, an increase in the enzyme concentration will not make any difference in the enzyme rate.

Enzyme are proteins that act as biological catalysts.

Enzyme activity is measured in micromoles of substrate converted (or product generated) per minute, which represents the rate of reaction catalyzed by that enzyme.

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When enzyme activity rate has reached stability, an increase in the enzyme concentration will not make any difference in the enzyme rate.

Enzymes are proteins that act as biological catalysts.

Enzyme activity is measured in micromoles of substrate converted (or product generated) per minute, which represents the rate of reaction catalyzed by that enzyme.

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According to Charle's law equation, the volume of a sample of carbon dioxide will be 684.6 mL and the temperature will be 283.60 K.

According to Charles' Law, the volume of a gas container with a certain amount of gas within is precisely proportional to the temperature when the pressure is constant.

[tex]V_{1}[/tex] = 684.6 mL

[tex]V_{2}[/tex] = 933.9 mL

[tex]T_{1}[/tex] = ?

[tex]T_{2}[/tex] = 387 K

Using Charle's law equation

[tex]\frac{684.6}{T_{1} } = \frac{933.9}{387}[/tex]

[tex]T_{1} = \frac{2,64,862.8}{933.9}[/tex]

[tex]T_{1} = 283.60 K[/tex]

According to Charle's law equation, the temperature at 684.6 mL volume was 283.60 K.

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The composition of a given pure compound is always the same no matter what the source of the compound.

A compound seems to be a substance that is entirely made of one kind of molecule.

Every component of compounds shares the same traits and features because of their homogenous makeup. However, because mixtures are composed of several sorts of chemicals, they frequently differ in terms of content, qualities, and samples.

Therefore, the composition of a given pure compound is always the same no matter what the source of the compound.

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The coordination number for pb will be 12

Four atoms make up each unit cell of the face-centered cubic (fcc), which has a coordination number of 12. Two atoms make up each unit cell of the body-centered cubic (bcc), which has a coordination number of eight.

The number of atoms, ions, or molecules that a central atom or ion in a complex, coordination compound, or crystal holds as its closest neighbours.

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Answer:

1 C3H8 + 5 O2 --> 3 CO2 + 4 H2O

Explanation:

USE PENCIL!  Balancing equations typically requires some initial trial and error.  Making changes is common.

_ C3H8 __ O2 --> __ CO2 __ H2O

We know we can only have whole molecules, so all number coefficients must be, eventually, whole numbers.  It is OK to start with a fraction, but the final must be a shole number.  Pick the most complex molecule (either product or reactant) and assign it a coefficient of 1.

1 C3H8 __ O2 --> __ CO2 __ H2O

Now find places for each of the atoms in C3H8 on the product side.  3 carbons means we need 3CO2 molecules, so add a coeffient of 3,

1 C3H8 __ O2 --> 3 CO2 __ H2O

3 CO2 means we need 6 oxygens, so add a coefficient of 3 for the O2:

1 C3H8 + 3 O2 --> 3 CO2 __ H2O

Now find a home for the 8 hydrogens that come from the 1 C3H8.  Add 4 to the H2O product:

1 C3H8 + 3 O2 --> 3 CO2 + 4 H2O

This last step added 4 more O to the product side, so we need to adjust the reactant source of O:

1 C3H8 + 5 O2 --> 3 CO2 + 4 H2O

Double check the result:

Element   Reactant  Product

 C                   3              3

 H                   8              8

 O                  10             10(6+4)

Everything checks.

[Note that one might use a fraction such as 1/2 or 1/3 just to make the balance work.  But fractions must be converted to whole numbers for the final equation.  For 1/2, multiply all coefficients by 2.  By 3 for 1/3, etc.]

The combination of a hydrogen atom in a molecule and the oxygen atom in another molecule leads to hydrogen bonding. Option D

For hydrogen bond to occur, hydrogen must be bonded to a highly electronegative atoms in a direct covalent linkage. This accounts for the high boiling point of water.

Thus we can say that a hydrogen bond occurred when a hydrogen from one molecule and an oxygen from another molecule. Option D

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The statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change (option C).

A redox or oxidation-reduction reaction is a chemical reaction in which some of the atoms have their oxidation number changed.

In a chemical reaction that involves oxidation and reduction, the oxidation number of the involved ions either decreases or increases.

Therefore, the statement that identifies an oxidation-reduction reaction is a reaction in which oxidation numbers change.

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Answer:

I think the element is carbon and the atomic mass is 12.011

Answer:

I believe it would be 30, 100, and 1. You count them, and they're significant figures. The decimals are an estimate and cannot be measure exactly. That is what I've learned, not sure what you're learning but hopefully it helps...

Explanation:

Basic explanation is when you count, that's an exact count. You're not estimating. That's real. But for measuring something, you wouldn't have a precise answer because it could go on forever (like Pi)... this is just what i'm assuming.

The basis of the difference between the leading and lagging strand is that DNA polymerase can join new nucleotides only to the 3' end of the growing strand.

The leading strand is the new DNA strand that continually extends from 5' to 3'. On the lagging strand, Okazaki fragments develop and are linked by DNA ligase activity. DNA polymerase can only attach new nucleotides to the 3' end of the developing strand, which forms the basis of the distinction between the leading and lagging strands.

Therefore, "DNA polymerase can link additional nucleotides exclusively to the 3' end of the developing strand" is the appropriate response.

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Answer:

best answer is D

Explanation:

if element has even number then protons and neutrons are same but if element has odd number then we should add 1 number in number of protons to know neutrons. but this rule is not work in 4 element that element are argon, nitrogen, hydrogen and one other

Energy levels of electrons (n) indicates the distance of the energy level from the nucleus values of n are positive integers n=1 is closest to the nucleus, and lower in energy

Any system which is in bounded state is consider to have negative potential energy and negative total energy.

The energy of the electrons rotating in the energy level is given as,

[tex]E_{n} = - 13.6/n^{2} eV[/tex]

So, on increasing value principle quantum number (n) the energy of the level is become higher.

The first energy level can contain  to 2 electrons , the second energy levels can contain 8 electrons and third energy levels can contain  18 electrons and fourth energy levels can contain  32 electrons

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The Haber process (a) is used to manufacture ammonia.

The Haber process, which artificially fixes nitrogen, is currently the primary industrial method for producing ammonia.

Using a metal catalyst and high temperatures and pressures, the process turns atmospheric nitrogen (N2) into ammonia (NH3) by reacting with hydrogen (H2).

Haber's reaction is -   N2   +    H2   ------>     NH3

The gases (nitrogen and hydrogen) are passed through four beds of catalyst in this conversion, which is normally carried out at pressures above 10 MPa (100 bar; 1,450 psi) and between 400 and 500 °C (752 and 932 °F). Cooling is applied between each pass to maintain a reasonable equilibrium constant.

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CH3 is the empirical formula for the compound.

A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.

The number of atom or moles in the compound is

1.17 g C X  1 mol of C / 12.011 g C = 0.097411 mol of C.

0.287 g H x 1 mol of  H / 1 g H = 0.28474 mol H.

This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.

So we can represent the compound with the formula C0.974H0.284.

Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.

we can divide 0.284 by 0.0974.

0.284 / 0.0974 = 3.

So here, Carbon is one and hydrogen is 3.

We can write the above formula as a CH3.

Hence the empirical formula for the sample compound is CH3.

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Explanation:

125)118

126)6

127)9

128)Au

There are 118 elements discovered yet and they are included in the periodic table.There are 6 hydrogens in ethanol. Number of total atoms in it is 9. The symbol of gold is Au.

Periodic table is a classification of elements discovered in nature. There are groups and periods for these elements where groups are vertical columns of elements with similar physical and chemical properties.

There are 118 elements in the periodic table. Thus option C is correct.

Ethanol is a simple alcohol formed by 2 carbons and 5 hydrogens with an OH group. Thus there are total 6  (option C) hydrogens and a total of 9 atoms (option C).  Ethanol is widely used in making of alcoholic products.

The chemical symbol of gold is Au. Chemical symbols are elements are derived from their latin names. The latin name of gold is Aurom. Thus it has the symbol Au. Therefore, option B is correct.

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Answer:

Dendral was the first expert system developed to determine the chemical structure of molecules.

Excited state configuration are 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹ , [Kr] 5s¹ 4d¹⁰ , [He] 2s¹ 2p⁵and  Ground state configuration are [Ne] 3s²3p³ ,  [Ar] 4s¹ 3d⁶.

The electronic configuration of an element describe the symbolic notation that how electrons are distributed in its atomic orbitals.

The ground state electronic configuration of an element describe the arrangement of an atom at its lowest possible energy state.

Cr has the ground state electronic configuration [Ar] 4s¹ 3d⁶.

Ag has the excited state electronic configuration [Kr] 5s¹ 4d¹⁰ .

Thus from the above conclusion we can say that Excited state configuration are 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹ , [Kr] 5s¹ 4d¹⁰ , [He] 2s¹ 2p⁵and  Ground state configuration are [Ne] 3s²3p³ ,  [Ar] 4s¹ 3d⁶.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: Classify the electron configurations of neutral atoms based on whether they represent an excited state configuration or a ground state configuration.

Excited State                       Ground State

Answer Bank:

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹

[Ar] 4s¹ 3d⁶

[Ne] 3s²3p³

[He] 2s¹ 2p⁵

[Kr] 5s¹ 4d¹⁰

(1.) Which neutral atom has the excited or ground state electronic configuration, [Ar] 4s¹ 3d⁶ ? Enter the name of the element.

(2.) Which neutral atom has the excited or ground state electronic configuration, [Kr] 5s¹ 4d¹⁰ ? Enter the name of the element

Liquid B is expected to be at the top while liquid A is found at the bottom.

The term density has to do with the ratio of the mass of a substance to its volume. Now given that the density of a substance actually shows how much heavy the substance is, it is not difficult to understand that a material that has a low density will flat at the top of a material that has a lower density.

Here we are told that the two liquids do not mix. If they do not mix then it follows that they must have formed a two phase system in which one is at the top of the other. The one that is at the top must have the lower density.

Thus, liquid B is expected to be at the top while liquid A is found at the bottom. From the density of the plastic cue, the cube will be at the top.

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The list of acceptable species of wood materials used in aircraft structure is found in Table 1-1 on Page 1-2 of AC 43.13-1B.

Construction of Aircraft with Wood There are four types of wood that are frequently used in the manufacture of aircraft. These include Douglas fir, Sitka spruce, birch, and ash. Additionally, gabon, mahogany, balsa, and pine serve specific purposes. Softwood Sitka Spruce grows in both Canada and the United States of America.

Contrary to popular opinion, Howard Hughes' Spruce Goose was made of birch, not spruce, despite the fact that Sitka spruce is the most often used wood in airplanes. Spruce is regarded as the best natural material for building aircraft because it has one of the highest strengths-to-weight ratios.

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It is a thermodynamically spontaneous process that means Protein folding occurs. The value of ΔG must be negative in the case of folding but in the case of unfolding, the value of ΔG must be positive.

When the process is thermodynamically spontaneous process results in Protein folding otherwise the process is unfolding.

The value for ΔG must be negative in the case of the folding process and the value for ΔG must be positive in the case of the unfolding process. The value of a thermodynamic parameter for the reverse reaction has an opposite sign but the same value that's why the value for ΔG must be positive and known as unfolding (denaturation) process.

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Answer:

.5 gm / ml

Explanation:

Density is defined as   mass/ volume

  so   density of this substance is   5 gm / 10 ml =  .5  gm/ ml

The amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively

Amino acids simply refers to those molecular substances which combine together to form proteins. However, they are the end products of protein digestion

So therefore, the amino acid and which atom which has most to do with myoglobin’s ability to bind o2 is histidine and haemoglobin respectively

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Answer:

I'm pretty sure the answer Is c because I think I remember doing something like that so yeah

Transferred to the lipoamide by an earlier intermediate in the process.

The pyruvate dehydrogenase complex (PDC) is a mitochondrial multienzyme complex composed of three different enzymes

the pyruvate dehydrogenase complex is the bridge between glycolysis and the citric acid cycle

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Celcius to Kelvin

Temperature is defined as the degree or intensity of heat present in a substance It is measured using a thermometer and other equipment. The temperature can be measured in Kelvin, Celsius, and Fahrenheit.

Temperature is a physical quantity, thermometers. The units in which can be measured by Celcius, and Fahrenheit. Temperature is measured can be Kelvin,

0° Celcius = 273 Kelvin

Celsius to Kelvin temperature conversion juan most likely to do

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Answer:

according to the law,the pressure would increase if volume has been decreased.

Explanation:

the reason is that,pressure and volume are inversely proportional,if volume has been decreased that means the pressure would increase because decreased volume would create a sort of compacted situation for particles either of a liquid or gas,decreasing volume would bring these particle together, closer to each other because of decreased  and since the volume has decreased they dont have enough space,they would end up getting closer to each other most likely to collide, which drastically increase pressure .

The carbon atom reduced in the transformation of chloromethane to methyllithium.

The reaction between chloromethane  and lithium form methyllithium.

[tex]CH_{3} Cl+ 2Li[/tex] → [tex]CH_{3} Li+ LiCl[/tex]

In above reaction, methyllithium is formed by the dispersing of lithium metal and adding chloromethane  .

The carbon atom in chloromethane  is partial positive charge because chlorine is high electronegative atom. The carbon atom in methyllithium is partial negative charge because carbon is more electronegative than lithium.

So, in above reaction two lithium metal donate two electron ( each lithium donate one electron) to the carbon atom(having positive charge) of chloromethane and get negative charge in methyllithium .

The gain of electron is reduction. So,The carbon atom reduced in the transformation of chloromethane to methyllithium.

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The molarity of the zinc chloride solution will be 0.089 M

Mole of 7.24 g ZnCl2 = 7.24/136.286 = 0.5312 mol

Total volume of water used in preparing the solution = 300 + 300 = 600 mL

Molarity of the solution = mole/volume = 0.5312/0.6 = 0.089 M

The molarity of the zinc chloride solution is, therefore, 0.089 M

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Answer:

door

Explanation:

door I guess..................