For the reaction A + B → C + D, if [A] doubles and [B] stays the same, and as a result the rate is cut in half, the reaction is: Select the correct answer below: O 0 O O zero order in A first order in A second order in A negative one order in A
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Two optical isomers can form:

An equimolar mixture of two optical isomers is called a racemic mixture.

What is a Racemic mixture?

An equimolar mixture of two enantiomers that is optically inactive is known as a racemic mixture (or racemate) (i.e. does not rotate plane-polarized light).

The racemic mixture can be created by:

The light that is plane-polarized does not spin in an optically inactive mixture.

Since each enantiomer rotates plane-polarized light to an equal and opposite extent, an equimolar mixture of two enantiomers will typically result in a racemic mixture. There won't be any net rotation if they are both present in equal proportions.

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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:

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

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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Galaxies is not the part of the Solar system.

Hence, Option B is correct answer.

Solar System is made up of all the planets that revolve around our Sun. Solar System contains eight planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.

Now lets check all options one by one

Option (A): Jovian Planets

Outer planets are called Jovian planets. These planets are Jupiter, Saturn, Uranus and Neptune. So Jovian Planets are part of the Solar System.

Hence, Option A is incorrect.

Option (B): Galaxies

Galaxy has a black hole at its center. It is a huge collection of dust, billions of star and gas. So galaxies are not a part of the Solar system.

Hence, Option B is incorrect.

Option (C): Terrestrial Planets

Innermost planets in solar system are Terrestrial planets. These planets are Mercury, Venus, Earth and Mars. So Terrestrial planets are part of the Solar system.

Hence, Option C is incorrect.

Option (D): Sun

The Sun is the part of the Solar system as it is the only star in our Solar system. Sun is the center of our Solar system.

Hence, Option D is incorrect.

Thus from the above conclusion we can say that Galaxies is not the part of the Solar system.

Hence, Option B is correct answer.

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Answer: The mass of mercury will be 57.5 micrograms.

The given question deals with Analytical Chemistry where Concentration is asked here.

Concentration: Generally concentration is defined as amount of the substance per unit volume. Concentration is also expressed in parts per million(ppm) when it is a small quantity as in case of mercury content in fish.

Explanation:   Given mass of the fish = 250 g,

                         ppm = 0.23

               Now mass of mercury = 0.23 ppm × 250 g                                                        

                                                     = 0.23/1,000,000 × 250g

                                                    =0.23×250/1,000,000 g

                                                    = 0.0000575 g

                                                    =57.5 micrograms

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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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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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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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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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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

Answer:

door

Explanation:

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

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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Answer:

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

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 relevant coefficients for each species on the right side of the equation in order to balance the charges.

We can add a coefficient of 2 to HCO³⁻ and a coefficient of 1 to CO3- because the charges must cancel out: H₂CO₃ ⇌ 2HCO³⁻ + CO₃²⁻-

The charges balance is now: No initial charge

Charge total: 2(-1) + (-2) = -4

Due to the balance of the charges, the charge balance equation is as follows: H₂CO₃ ⇌ 2HCO³⁻- + CO₃²⁻.

,Thus, The charge balance equation is as follows: H₂CO₃ ⇌ 2HCO³⁻- + CO₃²⁻.

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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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answer - Albert Einstein

explanation -

Albert Einstein is arguably the most influential scientist of the 20th century. His … general theory of relativity changed our understanding of space and time, becoming one of the two pillars of modern physics – the other being quantum mechanics.

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:

.5 gm / ml

Explanation:

Density is defined as   mass/ volume

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

The average rate of the reaction over the first 450 seconds -2.2×10⁻³ M/s

Speed is defined as the rate of change of the distance moved with time. Mathematically, it can be expressed as:

Speed = distance / time

With the above idea, we can obtain the rate of the reaction as illustrated below:

Rate = Change in concentration / time

Rate = -1 / 450

Rate = -2.2×10⁻³ M/s

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D is correct for number 2. i just finished

explanation; i got it right

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

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 production of a gas is different because unlike the heating curve, there was no heat applied to this experiment, and the experiment was a chemical reaction.

This shows the relationship between the temperature of the heating system and the air temperature in the outer environment.

The chemical reaction emitted heat as against the other which involved heat application which is why water formation in this curve was different.

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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.

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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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 molecular formula of dye:

A major textile dye manufacturer developed a new yellow dye with a molecular formula [tex]C_{15}N_{3}H_{15}[/tex].

Given:

Percentage composition:

C = 75.95%

N = 17.72%

H = 6.33%

Molar mass = 240 g

To find: molecular formula of dye

Calculation:

Let's assume the mass of the compound is 100 gm.

So,  Mass of C = 75.95 gm

Mass of N = 17.72 gm

Mass of H = 6.33 gm

The number of moles = given mass/mass

Therefore, the number of moles of C = 75.95/12 = 6.33

The number of moles of N = 17.72/14 = 1.27

Number of moles of H =6.33/1 = 6.33

Simplest ratio:

C = 6.33/1.27 = 4.98 =5

N = 1.27/1.27 = 1

H = 6.33/1.27 = 4.98 =5

Therefore, the empirical formula is [tex]C_{5}NH_{5}[/tex]

The mass of empirical formula = 12 x 5 + 14 + 1 x 5 = 79 gm

Number of moles= molar mass/ empirical formula

n = 240/79 = 3.04 =3

Therefore, molecular formula = empirical formula x n

Hence, molecular formula = [tex]C_{15}N_{3}H_{15}[/tex]

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Nylon, a polyamide, is produced from hexanedi-amine and a substance, x. This substance, x, is most probably a carboxylic acid.

A polymer containing repeating units connected by amide bonds being called a polyamide. Both naturally occurring and synthetic polyamides are found. Proteins found in materials like wool and silk were examples of naturally produced polyamides.

The term "nylon" refers to a family of polymeric materials made up of polyamides. Nylon would be a silk-like thermoplastic that may be formed into threads, films, or other shapes. It is often manufactured from petroleum.

Therefore, Nylon, a polyamide, is produced from hexanedi-amine and a substance, x. This substance, x, is most probably a carboxylic acid.

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electrical conductivity is the kind of defect or dislocation a carbon in a ti metal lattice represents.

The electrical conductivity of a metal is the result of the movement of charged particles. Atoms of metal elements are electrons in the outer shell of the atom and are characterized by the presence of valence electrons that can move freely around

Staircase dislocations and Lomer-Cottrell dislocations are examples of fixed dislocations. The two main types of movable dislocations are blade dislocations and spiral dislocations. The blade dislocations can be visualized as being caused by the termination of the atomic plane at the center of the crystal.

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