An allosteric enzyme can exist in two states, _____ and _____.
tense; responsive
tense; relaxed
turgid; relaxed
tight; responsive
tight; relaxed

Answer:

Explanation:  15

If a student looks up an element on the periodic table. The table says that if the atomic number of the element is 12 and the mass number of the element is 40, then the number of protons would be 12 and the number of neutrons would be 28.

It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.

Whenever a student searches for an element on the periodic table. According to the table, the number of protons and neutrons would be 12 and 28 respectively if the element had an atomic number of 12 and a mass number of 40.

Thus, the number of protons for that element would be 12 and the number of neutrons would be 28.

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Heat is the energy that a thing possesses as a result of the movement of its atoms and molecules, which are always bouncing off of one another and other objects. An object's atoms and molecules move more quickly when we add energy to it, which increases the object's energy of motion or heat.

The gas will travel more quickly in the container if the temperature is raised. This occurs as a result of the particles' increased kinetic energy caused by heating. There will be more collisions between particles if they are traveling faster.

A substance's atoms and molecules move more quickly when it is heated. Whether the substance is a solid, liquid, or gas, this occurs.

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The standard boiling point of compound Z is 640.7 K.

To calculate the standard boiling point of compound Z, we need to use the Clausius-Clapeyron equation:

ln(P₂/P₁) = -ΔHvap/R (1/T₂ - 1/T₁)

where P₁ is vapor pressure at temperature T₁, P₂ will be the vapor pressure at temperature T₂, ΔHvap is the heat of vaporization, R will be the gas constant, and ln denotes the natural logarithm.

At the standard boiling point, P₁ = 1 bar and T₁ = Tsb, where Tsb is the standard boiling point. At the normal boiling point, P₁ = 1 atm = 1.01325 bar and T₁ = Tnb, where Tnb is the normal boiling point. At both boiling points, the vapor pressure is equal to the atmospheric pressure.

Thus, we have:

ln(1.01325 bar/1 bar) = -38.3 kJ/mol / (8.314 J/mol-K) (1/Tnb - 1/Tsb)

Simplifying and solving for Tsb, we get:

Tsb = -38.3 kJ/mol / (8.314 J/mol-K) (1/(ln(1.01325))) + Tnb

Tsb = 290.7 K + Tnb

where Tnb is the normal boiling point in Kelvin.

We don't know the normal boiling point of compound Z, but we can assume that it is close to its standard boiling point. Therefore, we can use the boiling point of a similar compound as a reference. Let's assume that the normal boiling point of a similar compound Y is 350 K. Then, we can calculate the standard boiling point of compound Z as:

Tsb = 290.7 K + 350 K

= 640.7 K

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This chemical molecule consists of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.There are 24 atoms in all.Six C atoms, twelve H atoms, and six O atoms make up one glucose molecule.

Six-carbon glucose is broken down during glycolysis into two pyruvate molecules each one with three carbons.In the glycolysis summary below, glucose transforms to two pyruvate molecules, producing two ATP molecules and two NADH molecules.

D-glucose, D-fructose, D-galactose, & D-mannose are the four most prevalent six-carbon sugars (hexoses).

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The balanced equation for the overall cell reaction in the given galvanic cell is:

2Br-(aq) + Cl2(g) -> 2Cl-(aq) + Br2(l)

In this galvanic cell, inert electrodes, such as platinum (Pt), are required at both the anode and the cathode. Here's why:

At the anode: The anode half-reaction involves the oxidation of bromide ions (Br-) to form bromine (Br2). The half-reaction is:

2Br-(aq) -> Br2(l) + 2e-

Since bromine (Br2) is in its liquid state, it cannot be used as an electrode. Therefore, an inert electrode, like platinum (Pt), is used to allow the transfer of electrons during the oxidation process.

At the cathode: The cathode half-reaction involves the reduction of chlorine gas (Cl2) to chloride ions (Cl-). The half-reaction is:

Cl2(g) + 2e- -> 2Cl-(aq)

Similarly, chlorine gas (Cl2) cannot be used directly as an electrode, so an inert electrode, such as platinum (Pt), is used to facilitate the electron transfer during the reduction process.

In summary, inert electrodes (Pt) are required at both the anode and cathode in this galvanic cell to provide surfaces for electron transfer during the redox reactions.

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Answer:

Ice Cubes. When water freezes into ice cubes, the energy is released in the form of heat. ...

Formation Of Snow In Clouds. The process of snow formation is an exothermic reaction. ...

Hot Packs. ...

Rusting Of Iron. ...

Burning Of Candles. ...

Lightning Of Match. ...

Setting Cement And Concrete.

As temperature rises, water vapor molecules evaporate from the cloud. So option 3 is correct.

Clouds do condense at higher altitudes where temperatures are lower, but only when the temperature is high enough and the radiation is high enough, do the clouds evaporate.

Water is constantly circulating in the atmosphere. Water is released from the Earth’s surface and rises into the atmosphere through warm updrafts. The water condenses into clouds. The wind blows the water back into the atmosphere as rain or snow.

On the Earth’s surface, water evaporates to form water vapor, which then rises to the heavens to form a cloud that will move with the wind, releasing water back down to the Earth as rain.

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We are given that–

\(\qquad\)________________________

As we know –

\(\qquad\)\( \pink{\bf\longrightarrow {Mass = Volume \times Density } }\)

\(\qquad\)\( \bf\longrightarrow Mass_{(Propane)} = 389 \times 19.3 \)

\(\qquad\)\( \bf\longrightarrow Mass_{(Propane)} = 7507.7 \: g\)

\(\qquad\)______________________

Mass of a substance is the amount of the constituting particles per unit volume. The mass of the \(\bold { 389\ cm^3}\) of propane is 7.507 kg.

Mass of a substance is the amount of the constituting particles per unit volume. It is measured in kilograms (kg).

The formula for mass,

M =  v x d

Where,

M - mass

v - volume = \(\bold { 389\ cm^3}\)

d - density = 19.3 g/cm

Put the values in the formula,

M =  \(\bold { 389\ cm^3}\)  x   19.3 g/cm

M = 7507.7 g

M  = 7.507 kg

Therefore, the mass of the \(\bold { 389\ cm^3}\) of propane is 7.507 kg.

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To prepare 100 ml of a solution with 0.5 M KMnO4 and 1 M H2SO4, we need to calculate the amount of each compound needed.

For KMnO4:
0.5 M = 0.5 mol/L
0.5 mol/L × 0.1 L = 0.05 mol
0.05 mol × 158.034 g/mol = 7.9017 g

Therefore, we need 7.9017 g of KMnO4 to prepare the solution.

For H2SO4:
1 M = 1 mol/L
1 mol/L × 0.1 L = 0.1 mol
0.1 mol ÷ 18 M = 0.00556 L = 5.56 ml

Therefore, we need 5.56 ml of 18 M H2SO4 to prepare the solution.

In conclusion, to prepare 100 ml of a solution with 0.5 M KMnO4 and 1 M H2SO4, we need 7.9017 g of KMnO4 and 5.56 ml of 18 M H2SO4.

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To calculate the heat released during the combustion of methanol, you will need to know the heat of combustion of methanol, which is the amount of heat released when a given amount of methanol is burned in oxygen.

The heat of combustion of methanol is -726 kJ/mol.

To find the heat released in kJ using 790 grams of water and a temperature change of 9.1 degrees Celsius,

you will need to use the formula q = m * c * deltaT, where q is the heat released, m is the mass of the substance being heated (in this case, water), c is the specific heat of the substance, and deltaT is the change in temperature.

In this case, the heat released would be:

q = 790 g * 4.18 J/(g*C) * 9.1 C = 28,903.22 J.

To convert this to kJ, you would divide by 1000 to get 28.90322 kJ. Rounded to the nearest integer, the heat released would be 29 kJ.

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Answer:

A. a- helixes and B-pleated sheats

Explanation:

A helical (a-helix) or flattened sheets (B-pleated sheet) like structures are established between opposite charge bearing groups of different amino acids are called Secondary Structures.

Ethanol, propanol, and methanol are three simple alcohols. They can be grouped together because they all share the same hydroxyl group.

A hydroxyl group is a functional group consisting of an oxygen atom with two lone pairs covalently bonded to a hydrogen atom. The chemical representation of the hydroxyl group is -OH.

Alcohols, Sugar and carboxylic acids usually contain hydroxyl groups. All the alcohol have the same functional group which is why they are represented by the formula ROH. Here R is an alkyl group and OH is a hydroxyl group.

Alcohols are formed when this group is added to an organic compound.

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Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

You need 11.93 grams of calcium hydride to produce 6.84 L of hydrogen gas at 25.0°C and 0.975 atm.

To produce 6.84 L of hydrogen gas at 25.0°C and 0.975 atm, you need 4.86 grams of calcium hydride.

1. Convert the given volume, temperature, and pressure of hydrogen gas to moles using the ideal gas law (PV = nRT).
2. Use the chemical equation to find the moles of calcium hydride required to produce the calculated moles of hydrogen gas.
3. Convert moles of calcium hydride to grams using its molar mass.

Step 1: Calculate moles of hydrogen gas
n = PV / RT = (0.975 atm * 6.84 L) / (0.0821 L atm/mol K * (25°C + 273.15 K)) = 0.2833 mol H₂

Step 2: Moles of calcium hydride
CaH2 → Ca + H₂ (1 mol CaH₂ produces 1 mol H₂)
0.2833 mol H₂ requires 0.2833 mol CaH₂

Step 3: Convert moles to grams
Molar mass of CaH₂ = 40.08 g/mol (Ca) + 2 * 1.01 g/mol (H) = 42.10 g/mol
0.2833 mol CaH₂ * 42.10 g/mol = 11.93 g

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Answer:

concentration = mol/volume = 4/2 = 2M

Answer:

Well, you'd have 1 electron more than protons (since there are 10 protons and 11 electrons). So the previously neutral ion has now become an ion with a -1 charge

Answer:

b. all of the above

they are all correct

The given statement " Acidic rain, snow, fog, and cloud vapor typically has a pH of 5.6" is false.

Acidic rain, snow, fog, and cloud vapor typically have a pH lower than 5.6. pH values below 5.6 indicate acidity. Acidic precipitation is caused by the presence of pollutants, such as sulfur dioxide (SO₂) and nitrogen oxides (NOₓ), in the atmosphere.

These pollutants react with water vapor and form sulfuric acid (H₂SO₄) and nitric acid (HNO₃), which lower the pH of the precipitation. The pH of acidic rain, snow, fog, and cloud vapor can vary, but it is usually in the range of 4 to 5.6 or even lower in heavily polluted areas.

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Answer:

hey there!

I hope this is correct it is a adult plant

The covalent molecule is methane. Option C, methane (CH4) is the right answer.

Methane (CH4) is a covalent molecule that contains four hydrogen atoms and one carbon atom. Each is C, methane (CH4).

Methane (CH4) is a covalent molecule that contains four hydrogen atoms and one carbon atom. Each hydrogen atom shares one electron with the carbon atom, and the carbon atom shares one electron with each hydrogen atom, for a total of eight shared electrons. However, each bond involves two electrons, so there are only four covalent bonds and six shared electrons.

Ammonia (NH3) contains eight shared electrons, chlorine (Cl2) contains two covalent bonds and four shared electrons, and water (H2O) contains ten shared electrons.

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The covalent molecule is ammonia

A covalent molecule is a molecule in which two or more atoms share electrons through covalent bonds. Covalent bonding is a type of chemical bonding in which atoms share one or more pairs of valence electrons in order to attain a more stable electron configuration.

In a covalent molecule, the shared electrons are attracted to the positively charged nuclei of the atoms involved in the bond, holding them together. Covalent molecules tend to have relatively low melting and boiling points, and they are typically not good conductors of electricity

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Answer:

because H (hydrogen) is very reactive with other elements

Explanation:

Spectra analysis is the process of interpreting the information contained in a spectrum, such as a mass, IR, NMR or Raman spectra. The peaks in a spectrum represent specific molecular species or functional groups, and the assignment of these peaks to specific compounds or functional groups is an important part of spectra analysis.

The emission spectra or emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

In chemical reactions, impurities are often produced as byproducts and can interfere with the desired outcome. Some common impurities include unreacted starting materials, side products, contaminants, and degradation products. Whether or not these impurities are visible in a spectrum depends on the sensitivity of the instrument and the specific spectra being analyzed.

If you provide me with more specific information about the spectra you're analyzing, I would be happy to provide more information.

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Answer:

The evidence that demonstrated that the Chlorine in the stratosphere is believed to come primarily from CFCs ( Chlorofluorocarbons) rather than from natural sources such as volcanoes was due to the study conducted in which the amount of chlorine in the stratosphere over the past 20 years was measured and it was discovered that there was an increase over the years. This also corresponded with a rise in CFCs over the same period which shows that the chlorine in the stratosphere was from man made chemicals such as chlorofluorocarbons.

Chlorine in the stratosphere is primarily from man-made chemicals rather than from natural sources such as volcanoes is evident as follows;

Discussion;

Most of the chlorine in the stratosphere is there as a result of human activities, as the figure below illustrates.

Many compounds containing chlorine are released at the ground.

Volcanoes can emit large quantities of hydrogen chloride, but this gas is rapidly converted to hydrochloric acid, which dissolves in rain water, ice, and snow and does not reach the stratosphere.

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Answer:327.279512grams

1 moles NaCl = 58.44277 gram

Explanation:

Answer:

Erosion: the process of eroding or being eroded by wind water or other natural agents.

Weathering: the process of wearing or being worn by long exposure to the atmosphere

Deposition: the action of deposing something

Example: (deposition) " pebbles were formed by the deposition of calcium in the solution"

Explanation:

hope this is right

To determine the gas in g/mL, we need to calculate the volume of the gas first. We can use the formula for the volume of a rectangular room to find the volume of the room:

Volume = length x width x height = 2.00 m x 2.00 m x 5.00 m = 20.00 m³

Next, we need to convert the mass of the gas from grams to kilograms, since density is usually expressed in units of kg/m³. We can do this by dividing the mass by 1000:

Mass = 3175 g ÷ 1000 = 3.175 kg

Finally, we can calculate the density of the gas using the formula:

Density = Mass ÷ Volume

Density = 3.175 kg ÷ 20.00 m³ = 0.1588 kg/m

To convert the density from kg/m³ to g/mL, we need to multiply by 1000 and then divide by 1000:

Density = 0.1588 kg/m³x 1000 g/kg ÷ 1000 mL/L = 0.1588 g/mL

Therefore, the gas has a density of 0.1588 g/mL. Without additional information, we cannot determine the identity of the gas.

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C = m V . The unit of concentration is typically given as g/mL because the solute mass is frequently given in grammes and the volume is frequently given in milliliters. However, there are a tone of other mass and volume unit combinations that are possible.

Given that a solution consists of both a solute and a solvent, its total volume is equal to the sum of the volumes of both the solute and the solvent it contains.

A solution's concentration is an indicator of how much solute has dissolved in a specific volume of solvent or solution. When there is a significant amount of dissolved solute in a solution, it is said to be concentrated. When a dissolved solute is present in a solution, it is said to be diluted.

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