How much neat is needed to warm 50 g of iron from 20.°C to 100.°C?

Competitive inhibitors are molecules that bind to the active site of an enzyme and prevent the binding of the substrate. They compete with the substrate for binding to the enzyme's active site, and their binding can be reversible or irreversible.

When a competitive inhibitor is present, it binds to the active site of the enzyme and forms an enzyme-inhibitor complex. This complex prevents the substrate from binding to the active site and forming an enzyme-substrate complex. As a result, the rate of the reaction decreases, and the reaction may stop altogether if the concentration of the inhibitor is high enough.

The inhibition caused by a competitive inhibitor can be overcome by increasing the concentration of the substrate. This is because the substrate and the inhibitor compete for binding to the same active site, and increasing the concentration of the substrate increases the probability that it will bind to the active site and form an enzyme-substrate complex.

Overall, competitive inhibitors can be used to regulate enzyme activity and control chemical reactions in the body. They are also used in the development of drugs and pesticides to target specific enzymes and prevent unwanted chemical reactions.

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When the child sits on the partially filled balloon, the pressure of the balloon increases. The pressure change is a doubling of the initial pressure, indicating a factor of 2 increase.

When the child sits on a partially filled balloon, the volume of the balloon decreases by half. According to Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at constant temperature, the pressure inside the balloon increases.

Let's consider the initial volume of the balloon as V and the initial pressure as P. When the volume decreases by half, it becomes V/2. Since the amount of gas remains constant, the pressure increases to maintain equilibrium. The new pressure can be denoted as P'.

According to Boyle's Law, P₁V₁ = P₂V₂, where P₁ and V₁ are the initial pressure and volume, and P₂ and V₂ are the final pressure and volume. Plugging in the values, we have P * V = P' * (V/2).

Simplifying the equation, we get P' = 2P. This means the pressure of the balloon increases by a factor of 2, or it doubles. So, the pressure change can be expressed as an increase of two times the original pressure.

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Answer:

C. N₂O₄ → N₂ + 2O₂

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define

N₂O₄ decomposes into N₂ and O₂

Step 2: RxN

Unbalanced RxN:   N₂O₄ → N₂ + O₂

Balanced RxN:   N₂O₄ → N₂ + 2O₂

True, To maintain beer quality, it is important to maintain consistent calcium and pH levels in the water, wort, and beer. Calcium is important for yeast health and stability, while pH affects enzyme activity and flavor stability.

What is pH?

It is defined as the negative logarithm (base 10) of the concentration of hydrogen ions  in a solution. pH values range from 0 to 14, with a pH of 7 considered neutral. Solutions with a pH less than 7 are acidic, while those with a pH greater than 7 are basic.

For example, a solution with a pH of 3 has a higher concentration of hydrogen ions (and therefore more acidic) than a solution with a pH of 5. A change of 1 pH unit represents a ten-fold change in the concentration of hydrogen ions, so a solution with a pH of 2 is ten times more acidic than a solution with a pH of 3. pH is an important parameter in many chemical and biological processes and is routinely measured in laboratories and in many industries.

The average pH for wort is typically higher than the average pH for beer. During the brewing process, enzymes in the malt break down starches into fermentable sugars, which lowers the pH of the wort. During fermentation, yeast consume the sugars and produce alcohol and carbon dioxide, which raises the pH of the beer. As a result, the pH of the final beer is usually lower than the pH of the wort.

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Answer:

False

Explanation:

Although polymers can be melted at very low temperatures, it is very difficult for polymers to form complex shapes upon cooling. The statement is false.

A polymer is a macromolecule, combination of many subunits, it can be found all around us, In DNA naturally occurring biopolymer are present, polypropylene  used as the plastic.

Polymers naturally found in plants and animals or may be man-made or called as synthetic polymers.

Different polymers have both physical and chemical properties, like the tensile strength increase due to the chain length and increase in cross-linking, do not melt, present in crystalline to semi-crystalline form.

The polymer is formed by hydrogen bonding and ionic bonding resulting in better cross-linking strength, Dipole-dipole bonding side chains is observed which show its high flexibility, Van der Waals forces can also link the chains.

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Answer:

\( \huge{ \boxed{1.213 \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L}} \\ \)

where

From the question

N = 7.30 × 10²³ NaCl molecules

\(n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126\)

We have the final answer as

Answer:

606.09K

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the provided information in the question;

P1 = 0.922atm

P2 = 1030torr = 1.355atm

V1 = 4.64L

V2 = 4.36L

T1 = ?

T2 = 837K

Using P1V1/T1 = P2V2/T2

0.922 × 4.64/T1 = 1.355 × 4.36/837

4.278/T1 = 5.9078/837

Cross multiply

5.9078T1 = 837 × 4.278

5.9078T1 = 3580.69

T1 = 3580.69/5.9078

T1 = 606.09K

The compound dibromobis(ethylenediamine)cobalt(III) sulfate, there are 3 individual ions per formula unit: one cobalt(III) complex ion [Co(en)2Br2]+3, one sulfate ion (SO4)^2-, and three water molecules as each formula unit contains three waters of hydration.

For Dibromobis(ethylcuediamine)cobalt(III) sulfate, the number of individual ions per formula unit and the coordination number of the metal ion are: - Number of individual ions per formula unit: There are a total of 6 ions per formula unit.

The compound has the following formula: [Co(ethylenediamine)2Br2]SO4. This means that there are two ethylenediamine ligands, each contributing 2 nitrogen atoms for a total of 4 nitrogen atoms.

Each nitrogen atom has a lone pair of electrons that can coordinate with the cobalt ion. There are also 2 bromide ions and 1 sulfate ion in the formula.

So, the total number of individual ions per formula unit is 4 nitrogen atoms + 2 bromide ions + 1 sulfate ion = 6 ions. - Coordination number of the metal ion: The metal ion in this compound is cobalt(III). Cobalt(III) has a coordination number of 6, which means that it can coordinate with 6 ligands. In this compound, there are 2 ethylenediamine ligands, each contributing 2 nitrogen atoms for a total of 4 nitrogen atoms.

The coordination number of the metal ion (cobalt) in this compound is 6, as there are two ethylenediamine (en) ligands, each with two nitrogen atoms coordinating to cobalt, and two bromine atoms also coordinating to cobalt (2x2 + 2 = 6).

The 4 nitrogen atoms coordinate with the cobalt ion, leaving 2 open coordination sites. These sites are occupied by the 2 bromide ions, giving a coordination number of 6 for the cobalt ion.

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they have rod cells - this helps them be able to see colors through a spectrrum located in the retina

Answer:

During a car crash, the impact of the metal cage of the car will act like Jack's safe and Jill's quilts will act like the airbags of the car because they both would relieve pressure and impact.

Explanation:

During a car crash, the impact of the metal cage of the car will act like Jack's safe an Jill's quilts will act like the airbags of the car because they both would relieve pressure and impact.

TSL stands for Test and Set Lock. It is a synchronization primitive used in computer programming to prevent multiple threads from accessing a shared resource simultaneously.

The way TSL works is by first checking the value of a shared variable, and if it is not being used by another thread, the TSL operation sets the value to indicate that it is now in use by the current thread. This atomic operation ensures that no other thread can access the shared resource until the current thread has finished using it and releases the lock.

TSL is considered atomic because it happens without a switch in processes, meaning it is a single, indivisible operation that cannot be interrupted or modified by other threads. This property is essential for ensuring thread safety and preventing race conditions in concurrent programming.

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Answer:

the answer is A, they are measured in kilograms

Answer:

2.7 mL

Explanation:

The equation of the reaction is;

2AlBr3 + 3Cl2 -----> 2AlCl3 + 3Br2

Number of moles in 2.12 x 1022 formula units of aluminum bromide

1 mole of AlBr3 = 6.02 * 10^23 formula units

x moles = 2.12 x 1022 formula units

x = 2.12 x 1022 formula units  * 1 mole/ 6.02 * 10^23 formula units

x = 0.0352 moles of AlBr3

According to the reaction equation;

2 moles of AlBr3 produces 3 moles of Br2

0.0352 moles of AlBr3 produces 0.0352 moles  *  3 moles /2 moles

= 0.0528 moles of Br2

Mass of Br2 produced = 0.0528 moles of Br2 * 159.808 g/mol

Mass of Br2 produced = 8.44g

But density = mass/volume

volume = mass/density

volume of Br2 = 8.44 g/ 3.12 g/mL

volume of Br2 =  2.7 mL

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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The original volume at 101.3 kPa that is required to fill the 15-liter scuba tank is approximately 31.56 liters.

Given, Pressure in the scuba tank, P1 = 212.8 kPa

Volume of the scuba tank, V1 = 15 liters

Pressure required to fill the scuba tank, P2 = 101.3 kPa

Let V2 be the original volume required to fill the scuba tank. We can use the Ideal gas law which states that

PV = nRT

Where,

P = pressure

V = volume of the container

n = number of moles of gas

R = gas constant

T = temperature of the gas

The pressure, volume, and temperature of the gas are related to each other through the equation

PV = nRT

On rearranging the above equation, we get

V = nRT/P

where,

n = moles of gas

T = temperature in Kelvins

Substituting the values in the above equation, we get

V1/P1 = V2/P2V2 = V1 × P2 / P1V2 = 15 liters × 101.3 kPa / 212.8 kPa ≈ 7.12 liters

At 101.3 kPa, the original volume required to fill the scuba tank is approximately 7.12 liters.

However, the given volume of the scuba tank is 15 liters. So, we cannot fill a 15-liter scuba tank with a volume of 7.12 liters.

Therefore, we have to calculate the volume of the scuba tank when it is filled at 101.3 kPa.

So, we use the Ideal gas law again and calculate the volume of the scuba tank. Let V be the volume of the scuba tank at 101.3 kPa.V2/P2 = V/P1V = V2 × P1 / P2V = 7.12 liters × 212.8 kPa / 101.3 kPa ≈ 15 liters

Hence, the original volume at 101.3 kPa that is required to fill the 15-liter scuba tank is approximately 31.56 liters.

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To produce carbon disulfide and hydrogen gas, methane and hydrogen sulphide were used in the process. 70.0 g of carbon disulfide were produced using 32.0 g of methane. This reaction's percentage yield is 46.1%.

The following is the chemical reaction for balance

CH4(g) + 2H2S  → CS2(g) + 4H2 (g)

As a result of the chemical reaction described above, it can be seen that 1 mol of methane produces 1 mol of carbon disulfide.

So, 32 g of methane is equivalent to (32/16) = 2 mol of methane.

The result is that 2 mol of methane will result in 2 mol of carbon disulfide.

Theoretically, the yield of carbon disulfide is therefore (2*76)g = 152g.

Nevertheless, the actual yield of carbon disulfide was 70.0 g.

Carbon disulfide of percentage yield = (70/152)*100%, or 46.052%, or 46.1%.

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The estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

Molar mass of water, M = 18g/molDensity of water, ρ = 1g/cm³ = 1000kg/m³The number of molecules per unit surface area of water can be estimated as follows:Number of water molecules per unit volume of water = Avogadro's number, NA / MNumber of water molecules per unit volume of water = 6.022 × 10²³ / 18 = 3.345 × 10²² / molThe number of molecules per unit surface area of water = the number of molecules per unit volume of water × the thickness of the water layer on the surface= 3.345 × 10²² / m³ × 1 × 10⁻⁸ m= 3.345 × 10¹⁴ / m²b)Given:Coordination number of water, CN = 4Binding energy of hydrogen bond, E = 10⁻²⁰ JThe surface tension of water, γ water = 0.072 N/mEnergy required to bring one molecule from the bulk of the liquid to the surface of the liquid, ΔE= γ water × AThe total binding energy of a water molecule in the liquid state = the binding energy of one hydrogen bond × the coordination number= 10⁻²⁰ J/bond × 4 bonds = 4 × 10⁻²⁰ JThe number of molecules per unit surface area of water = the energy required to bring one molecule from the bulk of the liquid to the surface of the liquid / the total binding energy of a water molecule in the liquid state= ΔE / 4 × 10⁻²⁰= 0.072 / (4 × 10⁻²⁰)= 1.8 × 10²⁰The surface tension of water can also be expressed as follows:γ water = (N / A) × EThe number of hydrogen bonds per unit area, N / A = γ water / E= 0.072 / 10⁻²⁰ = 7.2 × 10¹⁸ / m²The difference between the estimated value and the observed value is relatively large (about a factor of 25). It is because this is just an estimate, and it does not consider all the factors affecting the surface tension of water. However, the estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

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A spring tide represents a natural process where more energy is produced when compared to other days in order to turn a turbine.

A renewable energy can be defined as any source of energy that is reversibly obtained from the nature.

In conclusion, a spring tide represents a natural process where more energy is produced compared to other days in order to turn a turbine.

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Answer:

C. during a spring tide

Explanation:

:D

On the Modified Mercalli Scale, intensity XII is described as "Catastrophic" or "Total Destruction."

Intensity XII represents the highest level of damage and destruction caused by an earthquake. It indicates that the shaking is so severe that virtually all buildings and structures experience extensive damage or complete collapse.

Ground fissures, landslides, and other significant ground deformations may also occur. Utility systems, such as water, gas, and electrical networks, are likely to be extensively disrupted or completely destroyed. Additionally, there may be widespread panic, and the overall social and economic impact can be devastating.

The Modified Mercalli Scale is a subjective scale that assesses the effects of an earthquake based on observed damage and the impact on people, structures, and the environment. It provides a qualitative description of the level of shaking and its consequences rather than relying on instrumental measurements.

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Answer:

Explanation:

The closest I can come to this is

Li C2H5 which would really be weird, but it comes to nearly 37.11. Everything depends on the periodic table you are using.

C2 = 2 * 12.011 = 24.022

H5 = 5 *   1.008 = 5.040

Li =  1 * 6.94          6.94

Total                    36.002  

Answer:

these are two atoms which have the same number of protons but different number of neutrons

The term molarity is an important method which is used to determine the concentration of a solution. It is mainly used to calculate the concentration of a binary solution. The molarity is  0.66 M.

Molarity is defined as the number of moles of the solute present per litre of the solution. It is represented as 'M' and it is expressed in the unit mol / L. The concentration of a solution can also be expressed in molality, normality, etc.

Molarity = Number of moles / Volume of solution in L

M = 10 / 15 = 0.66 M

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Answer:

A Chemical reaction involves changes in energy in the form of absorbtion and release of heat due to the formation and breakdown of chemical bonds. A chemical reaction is categoried as endothermic reaction in which heat energy is take in or absorbed and exothermic reaction in which energy is released.

A model can be created by following below details:

So, the decrease in temperature shows it is an endothermic reaction in which heat energy is absorbed.

Energy change in the reaction has been stored in the products and the reactants. The change in the reactant to product results in a change in energy.

According to the law of conservation of energy, energy can neither be created nor destroyed in a chemical reaction. The chemical reaction has been resulted in the energy change by the endothermic and exothermic reactions.

The project model for energy change can be:

Reactant + Energy = Products.

The ice cube has been placed in a beaker. It has been consisted of the stored potential energy. WIth the application of heat energy there has been the conversion of ice cubes to the water, and the potential energy of the ice cubes has been converted to the kinetic energy of the moving liquid particles.

Reactant = Product + Energy

The model has consisted of matching the light with a matchstick. The chemical energy of the stored matchstick has been converted to light and heat energy.

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The production of nylon involves the reaction of two monomers: hexamethylenediamine and adipic acid. The reaction proceeds in several steps:

The hexamethylenediamine acts as a nucleophile and attacks the carbonyl group of the adipic acid, forming an amide bond and releasing a water molecule:

HOOC-(CH2)4-COOH + NH2-(CH2)6-NH2 → HOOC-(CH2)4-CO-NH-(CH2)6-NH2 + H2O

The resulting molecule, called a dipeptide, undergoes a dehydration reaction, where a water molecule is eliminated to form a peptide bond and a new molecule of water:

HOOC-(CH2)4-CO-NH-(CH2)6-NH2 → HOOC-(CH2)4-NH-(CH2)6-CO-NH-(CH2)4-COOH + H2O

The process repeats itself, with more dipeptides reacting to form longer chains, until a large polymer is formed.

The new linkage formed as a result of the polymerization is called an amide linkage or peptide bond. It is a covalent bond between the carbonyl group of one monomer and the amino group of another monomer, formed by the elimination of a water molecule.

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