Which of the following is TRUE about enzymes? 1. Enzymes typically catalyze reactions at much higher rates than chemical catalyst. II. Enzymes are often very specific for their substrates III. Enzyme activities can often be regulated. IV. Enzymes typically act under milder conditions of temperature and pH than chemical catalysts. A) I, II, III B) I, II, III, IV C) II, 11 D) III, IV E) II, III, IV

The mass of the tin sample has been 95.682 g.

The specific heat has been given as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

The heat required has been expressed as:

\(\rm Heat=mass\;\times\;specific\;heat\;\times\;\Delta T\)

The heat required by tin sample has been given, 543 J

The specific heat of tin has been, \(c_p=0.227\;\rm J/g^\circ C\)

The change in temperature (\(\Delta T\)) has been given as:

\(\Delta T=\text{Final\;temeprature-Initial temperature}\\\Delta T=\rm -10^\circ C-15^\circ C\\\Delta \textit T=-25^\circ C\)

Substituting the values for the mass of tin

\(\rm 543\;J=Mass\;\times\;0.227\;J/g^\circ C\;\times\;-25^\circ C\\543\;J=Mass\;\times\;5.675\;J/g\\Mass=95.682\;g\)

The mass of the tin sample has been 95.682 g.

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Answer:

For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10.

Explanation:

The value calculated by using excess if NaOH by overshooting endpoint  during titration will be not correct.

The value of concentration is supposed to change when excess of NaOH is used. it will be little too high than the correct value. Thus, titration require precise values. Overshooting the endpoint will result in a calculation error for the solution that is being titrated. The calculation for the titrated solution will be off if the moles of titrant are incorrect because the volume of titrant is incorrect because it is higher than it should be.

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Answer:It is a picture with a boat sailing on the water with sound waves going down to an old and sunken ship but the waves then go back up to the boat in a different angle.

Explanation:

hope it works thx

Answer:

Many scientists view biofuels as inherently carbon-neutral: they assume the carbon dioxide (CO2) plants absorb from the air as they grow completely offsets, or “neutralizes,” the CO2 emitted when fuels made from plants burn.

Explanation:

put in your own words, happy to help

To solve such this we must know the concept of combustion reaction. Therefore, the missing word is neutral that is Biofuels are therefore described as being carbon neutral.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

When biofuels are burned they release the same amount of carbon dioxide as was removed from the atmosphere by the plant. Biofuels are therefore described as being carbon neutral. the products of combustion reaction are carbon dioxide and water.

Therefore, the missing word is neutral.

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The equilibrium constant (K) for the first reaction is approximately 0.000092.

Let's recalculate the equilibrium constant (K) using the correct values.

ΔG for the first reaction = -8.30 kJ/mol

ΔG for the hydrolysis of ATP to AMP = -31.6 kJ/mol

We can use the relationship between ΔG and K:

ΔG = -RT ln(K)

Where:

ΔG = ΔG1 + ΔG2 (since the reactions are coupled)

R is the gas constant (8.314 J/(mol·K))

T is the temperature in Kelvin (25°C = 298 K)

Converting the units for ΔG:

ΔG1 = -8.30 kJ/mol × (1000 J/kJ) = -8300 J/mol

ΔG2 = -31.6 kJ/mol × (1000 J/kJ) = -31600 J/mol

ΔG = ΔG1 + ΔG2 = -8300 J/mol + (-31600 J/mol) = -39900 J/mol

Now we can rearrange the equation to solve for K:

K = e^(-ΔG / RT)

Substituting the values:

K = e^(-(-39900 J/mol) / (8.314 J/(mol·K) × 298 K))

Simplifying:

K = e^(39900 J / (8.314 J·K/mol × 298 K))

K ≈ e^(15.83 mol^-1)

Calculating:

K ≈ 0.000092

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Answer:

Approximately \(0.20\; \rm L\).

Explanation:

Convert the temperature of this gas to absolute temperature:

\(T = 25\; \rm ^\circ C \approx (25 + 273.15)\; \rm K = 298.15\; \rm K\).

Let \(P\) and \(V\) represent the pressure and volume of this gas, respectively. Let \(n\) represent the number of gas particles in this gas. Let \(R\) represent the ideal gas constant. By the ideal gas law:

\(P \cdot V = n \cdot R \cdot T\).

For this question:

Look up the ideal gas constant \(R\) that takes \(\rm atm\) as the unit for pressure:

\(R \approx 0.082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\).

This question is asking for \(V\), the volume of this gas. Rearrange the ideal gas equation and solve for \(V\):

\(\begin{aligned} V &= \frac{n \cdot R \cdot T}{P} \\ &\approx \frac{0.00831\; \rm mol\times 0.0082057\; \rm L \cdot atm \cdot K^{-1}\cdot mol^{-1}\cdot 298.15\; \rm K}{1.01\; \rm atm} \\ &\approx 0.0020\; \rm L\end{aligned}\).

The responding variable refers to the variable that changes as the independent variable is being manipulated. In this case, the responding variable is the number of paper clips attracted by the magnet.

An experiment must include a dependent (responding) variable and an independent variable. As the independent variable is manipulated during the experiment, the dependent (responding) variable changes accordingly.

In this case; the independent variable is temperature while the dependent (responding) variable is the number of paper clips attracted by the magnet.

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The aluminium substances would retain the most heat for the longest period of time.

Retaining of heat is the quantity of heat that a substance or medium can store over time or the amount of heat that a specific amount of that substance can hold in itself. Substances that store heat 'well' (for a long time) also require a long time to heat up.

Copper and aluminium have the highest thermal conductivity among the more common metals, whereas steel and bronze have the lowest. When determining the metal to utilise for a certain application, heat conductivity is a critical quality to consider.

In addition, potassium has the highest specific heat and the longest heat retention time. Polystyrene, a polymeric polymer, can retain heat for up to 11 hours. This implies it can hold heat for extended periods of time.

Hence the aluminium substances would retain the most heat for the longest period of time.

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Answer: H2O(I) C

Explanation:

edge 2022

The digestive and respiratory systems work together to provide the body with the nutrients and oxygen it needs to function. The digestive system breaks down food into smaller molecules that can be absorbed by the body.

The respiratory system delivers oxygen to the blood, which carries it to the cells throughout the body. The cells use the oxygen to break down the food molecules into energy. The digestive system also produces carbon dioxide as a waste product. The respiratory system removes carbon dioxide from the blood and releases it into the air. In addition to their shared role in providing the body with nutrients and oxygen, the digestive and respiratory systems also work together to protect the body from harmful substances. The digestive system produces digestive enzymes that break down food, but these enzymes can also damage the cells of the digestive tract. The respiratory system produces mucus that traps harmful particles in the air before they can reach the lungs.

The digestive and respiratory systems are two very important systems that work together to keep the body healthy. An example of how the digestive and respiratory systems work together is when the epiglottis, a flap of tissue that covers the trachea when you swallow, prevents food from entering your lungs.

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In the periodic table, each element is assigned a unique chemical symbol which is characteristic of it's own and hence there is no other element with symbol Cr except chromium in the periodic table.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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To calculate the specific heat of silver, you will need to use the formula:

So for this example, we can calculate the specific heat of silver as follows:

Therefore, the specific heat of silver is 0.523 J/g°C.

The specific heat of silver is a measure of the amount of energy required to increase the temperature of one gram of silver by one degree Celsius. This value is important in understanding how different materials respond to temperature changes and can be used in many areas of science and engineering.

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Answer:

Hailey should add, they are inexpensive to produce.

Explanation:

Reason being why they are inexpensive to produce, is due to them being chemical based and easy to product in the factory setting. Which makes them extremely cheap to make.

Reason being why the others are wrong, synthetic polymers are not biodegradable as they are made in a factory with oils. Synthetic polymers are not flexible due to them being used for harder products. Synthetic polymers are not recycled cheaply as they are made with chemicals which makes it very hard to recycle.

answer:D

Explanation: i took it

Answer:

*two parameters

Explanation:

Answer:

D is the answer

Like my answer

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option D.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The two elements will form an ionic bind because one of the elements will donate two electrons to the other elements in order to have full outer shells.

Therefore, the correct option is option D.

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The molarity of the solution will be 0.72 m.

The majority of reactions take place in solutions, making it crucial to comprehend how the substance's concentration is expressed in a solution when it is present. The number of chemicals in a solution can be stated in a variety of ways, including.

The symbol for it is M, and it serves as one of the most often used concentration units. Its definition states how many moles of solute there are in a liter of solution.

Given data:

\(V_{1} =57.3 L\\V_{2} = 39.5 L\\M_{1} = 0.497 m\\\\M_{2} = ?\)

Molarity can be determined by the formula:

\(M_{1} V_{1} = M_{2} V_{2}\)

where, M is molarity and V is volume.

Put the value of given data in above equation.

57.3 × 0.497 m = M × 39.5 L

M = 0.72 m

Therefore, the molarity of the solution will be 0.72 m

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Answer:

2. chlorine

3. Copper??

4. Isotope

5. sodium, magnesium, aluminum, silicon, phosphorus, sulfur, or argon

6. Oganesson

7. Hydrogen

Hope these are right!

Answer:

They can travel at the speed of light.

Explanation:

all electromagnetic waves have the same speed which is equal to the speed of the light.

The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

Electromagnetic radiation is a type of energy waves that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma-rays. Sunlight is also a form of electromagnetic energy, but visible light is only a small portion of the electromagnetic spectrum, which contains a broad range of wavelengths.

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. In order from highest to lowest wavelength, the series is just opposite.

Electromagnetic radiations don't require any medium to travel and also travel in speed of light. They have Electric field vector and magnetic field vector that is perpendicular to each other and also are perpendicular to the direction of propagation.

Therefore, The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

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Water boiling is not a chemical reaction because it does not involve a chemical bond being broken or formed. During boiling, the water molecules absorb heat energy and gain enough kinetic energy to escape into the air as a gas, in the form of water vapor. This process is known as a physical change because it does not alter the chemical makeup of the water molecules, it only changes their physical state from liquid to gas.

To make a 500.00 mL molar solution of sodium hydroxide (NaOH), you would need to calculate the amount of sodium hydroxide required, determine the volume of water needed, and dissolve the sodium hydroxide in the water.

1. Calculate the amount of sodium hydroxide: To make a molar solution, you need to know the molar concentration of sodium hydroxide you want to prepare. Let's assume you want to make a 1.00 M solution. The molar mass of NaOH is approximately 40.00 g/mol. To calculate the amount of NaOH needed, use the formula:

  Amount (in moles) = Molarity × Volume (in liters)

  Amount = 1.00 mol/L × 0.50000 L = 0.50000 moles

2. Determine the volume of water: Since you want to make a 500.00 mL solution, the volume of water required is simply 500.00 mL.

3. Dissolving the sodium hydroxide: Take a suitable container and add the calculated amount of sodium hydroxide (0.50000 moles) to the container. Then, add the predetermined volume of water (500.00 mL) to the container. Stir the solution until the sodium hydroxide is completely dissolved.

By following these steps, you can make a 500.00 mL molar solution of sodium hydroxide with a concentration of 1.00 M.

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Answer:

B. H2SO4 + BaCl 2 --------> BaSO4 + 2HCl

Explanation:

Neutralization reactions are characterized by their reactants of acids and bases reacting to form salt and water. All of the options except B, have formation of salt and water. Also, B is more likely a percipitation reaction (also a double displacement reaction) and not neutralization.

Answer:

The activation energy increases how quickly the reaction will  progress.

Explanation:

The activation energy of a chemical reaction is intimately linked to its rate. Particularly, the greater the activation energy, the slower the chemical reaction will be. The reason is: molecules can only finish the reaction as soon as they have reached the peak of the activation energy barrier. Many reactions possess such huge activation energies that they practically don't advance at all without an input of energy.

The activation energy of a particular reaction determines the rate at which it will proceed. The higher the activation energy, the slower the chemical reaction will be.

The iodine molecule's i-i bond can be broken by light at a maximum wavelength of =782.39 nm.

A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically expressed in meters (m), centimeters (cm), or millimeters (mm) (mm).

Light with a specific wavelength has the following energy:

E = hc/λ

E = energy of light

h = planck's constant = 6.626*10⁻³⁴J-s

c = speed of light = 3*10⁸ m/s

We are given bond energy of one mole i–i , but we are required to dissociate one molecule of bromine monochloride bond.

Bond energy of one mole i–i = 153kJ/mol ( 1 mol = 6.022*10²³ )

Bond energy of one molecule of i–i = 153/6.022*10²³ kJ/molecule (1kJ = 1000J)

E = (153)*(1000)/(6.022*10²³ )J/molecule (Multiplied 1000 to change kJ to J)

E = hc/λ

153*(1000)/6.022*10²³ = 6.626*10⁻³⁴*3*10⁸×λ

λ = 782.39nm

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Answer:

Suppose that:

Mass of N-14= 14

and Mass of N-15= 15

fraction N-14 x 14 + fraction N-15 x 15 = 14.007

now.. if the fractions were =, that is if fraction N-14 = fraction N-15 = 0.5, then...

0.5 x 14 + 0.5 x 15 = 14.5

more N-15 would make that number larger...

0.3 x 14 + 0.7 x 15 = 14.7

let x = abundance of N-14, then (1-x) = abundance of N-15, and we could solve for x.

(X)x14 + (1-X)x 15 = 14.007

14X + 15 - 15X = 14.007

X = 0.993

the relative abundance of N-14 = 99.3%

the relative abundance of N-15 = 0.7%

So, according to the above explanation N-14 is abundant

Explanation:

Suppose that:

Mass of N-14= 14

and Mass of N-15= 15

fraction N-14 x 14 + fraction N-15 x 15 = 14.007

now.. if the fractions were =, that is if fraction N-14 = fraction N-15 = 0.5, then...

0.5 x 14 + 0.5 x 15 = 14.5

more N-15 would make that number larger...

0.3 x 14 + 0.7 x 15 = 14.7

let x = abundance of N-14, then (1-x) = abundance of N-15, and we could solve for x.

(X)x14 + (1-X)x 15 = 14.007

14X + 15 - 15X = 14.007

X = 0.993

the relative abundance of N-14 = 99.3%

the relative abundance of N-15 = 0.7%

So, according to the above explanation N-14 is abundant

Answer:

Energy is required to break bonds in a molecule and released when bonds are made.

Explanation:

Energy is added to break bonds and released when making bonds.

A gas consisting of 25. 6 moles of carbon fills a volume of 128 L and has a pressure of 135 kPa. The temperature of the gas is -270.58°C.

The temperature of a gas can be found using the Ideal Gas Law, which states that PV = nRT. The Ideal Gas Law relates the pressure, volume, and temperature of a gas to the number of moles of the gas present.

In this case, we are given the number of moles of the gas (n = 25.6 moles), the volume of the gas (V = 128 L), and the pressure of the gas (P = 135 kPa). We can use these values to find the temperature of the gas in degrees Celsius.

First, we need to convert the pressure from kPa to Pa. To do this, we multiply the pressure in kPa by 1000:

P = 135 kPa x 1000 Pa/kPa = 135 000 Pa

We can now substitute this value into the Ideal Gas Law:

PV = nRT

T = (nRT)/P

T = (25.6 mol * 8.314 J/mol.K) / (135 000 Pa)

T = 2.57 K

To convert from Kelvin to Celsius, we subtract 273.15 from the temperature in Kelvin:

T(°C) = T(K) - 273.15

T(°C) = 2.57 K - 273.15 = -270.58°C

So the temperature of the gas is -270.58°C

Please note that this is an ideal gas equation and it will not work for real gases. Also, the temperature is extremely low, it's unlikely that the gas can exist at that temperature.

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Answer:

The plum pudding model is one of several historical scientific models of the atom. ... The plum pudding model has electrons surrounded by a volume of positive charge, like negatively-charged "plums" embedded in a positively-charged "pudding".

Answer:

3 moles

Explanation: