which of the following determine reaction rate in an enzyme-catalyzed reaction?multiple select question.the energy required to break existing bondsthe number of productsthe activation energy

First, we must know Avogadro's number:

1 mol of any substance = 6.02x10^23 formula units (ions, atoms, molecules, etc)

Also, we can say this:

1 mol of Li2O = its mass expressed in grams

(from Li2O molar mass = 30 g/mol approx.)

Now,

1 mol Li2O = 30 g = 6.02x10^23 molecules Li2O

30 g Li2O ----------- 6.02x10^23 molecules Li2O

x ----------- 2.8x10^24 molecules Li2O

x = 140 g approximately

Answer: 140 g

Answer:

Ethanol

Explanation:

The balanced net ionic equation for the setup with a Zn electrode in a 1.0 M aqueous  Zn²⁺ solution on the left side and an Ag electrode in a 1.0 M aqueous Ag⁺ solution on the right side with a salt bridge added can be represented as follows: Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s)

In this setup, zinc metal (Zn) is oxidized and loses electrons at the anode to form zinc ions (Zn²⁺), while silver ions (Ag⁺) from the silver salt solution (AgNO₃) gain electrons at the cathode to form silver metal (Ag). The salt bridge is necessary to maintain electrical neutrality in both half-cells by allowing the transfer of anions and cations between them.

The balanced net ionic equation above represents only the species involved in the redox reaction, with the spectator ions (NO₃⁻ and Cl⁻) omitted. It also indicates the physical states of the reactants and products, with (s) representing solid, (aq) representing aqueous, and (l) representing liquid.

In summary, the balanced net ionic equation for the setup described is Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s), where zinc metal is oxidized at the anode and silver ions are reduced at the cathode, with a salt bridge facilitating the transfer of ions between the two half-cells.

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14.4 grams of Fe will form when 235 kJ of energy is released in this reaction.

To solve this problem, we need to use the given reaction and its enthalpy change to find the amount of Fe formed when 235 kJ of energy is released.

First, we need to balance the equation:

2 Al(s) + 3 Fe2O3(s) -> 3 Fe(s) + 2 Al2O3(s)

We can see that for every 3 moles of Fe2O3, we get 3 moles of Fe. So, we need to convert the energy released (235 kJ) to moles of Fe2O3:

-852 kJ = -3 moles of Fe2O3

1 kJ = 3/(-852) moles of Fe2O3

235 kJ = 3/(-852) x 235 moles of Fe2O3

235 kJ = -0.773 moles of Fe2O3

Now, we can use stoichiometry to find the amount of Fe formed:

3 moles of Fe -> 1 mole of Fe2O3

1 mole of Fe -> 1/3 mole of Fe2O3

Therefore,

1/3 mole of Fe2O3 = 0.773 moles of Fe2O3

0.773 moles of Fe2O3 x (1 mole of Fe/3 moles of Fe2O3) = 0.258 moles of Fe

Finally, we can use the molar mass of Fe to convert moles to grams:

0.258 moles of Fe x 55.85 g/mol = 14.4 grams of Fe

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Answer:

it increases the amount of oxygen in the water. kind of like how people whisk stuff to make it light and airy; the cobbles incorporate air in the stream. same with any other body of water that has cobbles.

that oxygen helps the life under the water survive. fish filter oxygen in their lungs. yes, some surface for oxygen too, but it can be in the water.

Glucose is the simplest sugar and carbohydrate that provides energy. The simplified model of glucose (C₆H₁₂O₆) shows carbon, hydrogen, and oxygen atoms linked together.

Glucose is an example of a carbohydrate macromolecule that is further classified as a monosaccharide. They are crystalline and fundamental units of carbohydrates.

The molecular formula of glucose is C₆H₁₂O₆ and the mass is 180.156 g/mol. It is an aldohexose that contains an aldehydic functional group. In its structure, there are six oxygen atoms, six carbon atoms, and twelve hydrogen atoms.

Therefore, the glucose molecule is composed of C, H, and O.

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Answer:

C

B

Explanation:

throwing cotton balls causes the person to blink.

and Its not an allergic reaction so it's more of stomach pain that sneezing

Answer:

it should be c for the first one then b for the second one

Explanation:

hope it helps :)

The specific heat of the metal is 0.30J/g°C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Step 1: Data given

Mass of metal = 75.0 g

Temperature of the metal = 65°C

Mass of water = 100.0 g

Temperature of the water = 20.0°C

Final temperature of the water = 22.3 °C

The specific heat of water is 4.184 J/g°C

Step 2: Calculate the specific heat of metal

Qlost = -Qgained

Q= m xCxΔT

Qmetal = -Qwater

m(metal) x c(metal) x ΔT(metal) = - m(water) x c(water) x ΔT(water

⇒m(metal) = the mass of metal = 75.0 g

⇒c(metal) = the specific heat of the metal = ?

⇒ΔT = The change of temperature = 22.3 - 65°C = -42.7 °C

⇒m(water) = the mass of water = 100.0 g grams

⇒c(water) = the specific heat of water = 4.186 J/g°C

⇒ΔT(water) = T2 - T1 = 22.3 - 20.0 = 2.3 °C

75.0 g x c(metal) x -42.7 °C= -100.0 g x  4.186 x 2.3

75.0 g x c(metal) x -42.7 °C = −962.78

c(metal) = 0.3006338798J/g°C =0.30J/g°C

The specific heat of the metal is 0.30J/g°C.

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Answer:

La cantidad de energía disponible de una fuente de energía determinada se denomina recurso energético. La escasez de recursos energéticos (petróleo, carbón y madera) en algunas de las fuentes de energía más utilizadas plantear necesidad de usar otras fuentes investigar el modo más rentable de emplearlas

Explanation:

Answer:

false

Explanation:

its the amount of high-quality energy available from a given quantity of an energy resource minus the high-quality energy needed to make the energy available.

For the given equation, the mole-to-mole ratio and volume-to-volume ratio for all the gaseous reactants and products are 1:1.

For the given equation:

CH4(g) + O2(g) → CO2(g) + H2O(g)

Reactant/Product:

CH4(g)

O2(g)

CO2(g)

H2O(g)

Mole-to-Mole Ratio:

By comparing the reactant and product coefficients, we may extract the mole-to-mole ratio from the balanced equation.

CH4(g): 1 mole

O2(g): 1 mole

CO2(g): 1 mole

H2O(g): 1 mole

All of the reactants and products have a mole-to-mole ratio of 1:1:1:1.

Ratio of Volume to Volume:

The ideal gas law, which states that under constant temperature and pressure, the volume of a gas is directly proportional to the number of moles in the gas, can be used to calculate the volume-to-volume ratio.

All gaseous reactants and products have a mole-to-mole ratio of 1:1, hence the volume-to-volume ratio will also be 1:1. As a result, the volume of drug A and substance B will be equal.

You can just take the volume of substance A as the value for substance B if you know the volume of substance A and are trying to solve for the volume of substance B. Alternatively, the quantity of substances A and Bwill be the same, given the 1:1 volume-to-volume ratio.

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Since the Gibbs free energy value (ΔG) is negative (-4.7 kJ/mol), the reaction 2 \(NO_{2}\)(g) yields \(N_{2}O_{4}\)(g) is spontaneous at 25°C.

Gibbs free energy, denoted as G, is a thermodynamic potential that measures the maximum reversible work that can be done by a system at constant temperature and pressure during a chemical or physical process. The formula for Gibbs free energy is:

ΔG = ΔH - TΔS

where:
ΔG = Gibbs free energy
ΔH = Enthalpy change (-57.2 kJ/mol)
T = Temperature in Kelvin (25°C = 298.15 K)
ΔS = Entropy change (-175.9 J/mol·K)

First, convert ΔS from J/mol·K to kJ/mol·K:
ΔS = -175.9 J/mol·K × (1 kJ/1000 J) = -0.1759 kJ/mol·K

Now, substitute the values into the formula and calculate ΔG:
ΔG = (-57.2 kJ/mol) - (298.15 K × -0.1759 kJ/mol·K)
ΔG = -57.2 kJ/mol + 52.5 kJ/mol
ΔG = -4.7 kJ/mol

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Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.

Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.

Molar concentration of the FeCl2 solution is calculated as 3.947 M.

Molar concentration of the solution is defined as number of moles of solute per liter of solution.

Given, mass of FeCl2 = 225 g and molar mass of FeCl2 = 126.75 g/mol

So, moles of FeCl2 = mass of FeCl2 / molar mass of FeCl2

= 225 g / 126.75 g/mol

= 1.776 moles

Given, volume of the solution is 450 mL, or 0.45 L,

the molar concentration can be calculated by:

molar concentration = moles of FeCl2 / volume of solution

= 1.776 moles / 0.45 L

= 3.947 M

So the molar concentration of the FeCl2 solution is 3.947 M.

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Answer:

1.777

Explanation:

To determine the number of moles of FeCl2 in the solution, we need to first convert the given mass of FeCl2 to moles using its molar mass.

Number of moles = Mass / Molar mass

Mass of FeCl2 = 225 g

Molar mass of FeCl2 = 126.75 g/mol

Number of moles of FeCl2 = 225 g / 126.75 g/mol = 1.777 moles

Therefore, the solution contains 1.777 moles of FeCl2.

a. Using paper towels to dry glassware is not recommended as it can leave fibers and other contaminants on the surface, affecting the accuracy of subsequent experiments. It is better to air-dry the glassware or use a clean, lint-free cloth.

b. Using compressed air from the lab air line can be effective, but it can also blow small particles and contaminants onto the surface, which can be detrimental to experiments. If using compressed air, it is best to use a clean, regulated source.

c. Using acetone of uncertain cleanliness is not advisable as it can contain impurities that may affect experiments. It is better to use clean acetone or other solvents with known purity.

d. Heating in an oven can be effective, but it can also cause thermal shock, leading to breakage. It is important to use heat-resistant glassware and to avoid sudden changes in temperature.

e. Using clean acetone and then heating in an oven can be a good option, but it is important to ensure that the acetone is completely evaporated before heating to avoid thermal shock and breakage. It is also important to use heat-resistant glassware.

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Answer:

\(volume = \frac{mass}{density} \\ \)

Answer:The role of memory is important in an animals sensory system. It helps them to be aware of their surroundings, find food and stay safe. Some animals bury food, they need to be able to remember where they put the food. Other animals migrate to find warmer places with food over the winter. Another example of animals using memory is the ability of some animals to carry out certain tasks, dogs can learn and remember commands.

Explanation:

Answer:

it's 5.93% but that's not an option so 6%

Explanation:

At STP 1mol of gas weighs 22.4L

Moles of chlorine

Now

Moles of AlCl_3

Mass of AlCl_3

Answer:

Well, it would be the height of the plant. The independant varibles would be the amount of water you give the beans or the temperature you keep them!

Explanation:

I hope this helps!

Answer: The given reaction is a neutralization reaction.

Explanation:

When an acid chemically reacts with a base then it leads to the formation of salt and water.

For example, \(3KOH + H_{3}PO_{4} \rightarrow K_{3}PO_{4} + 3H_{2}O\)

Here, KOH is a the base and \(H_{3}PO_{4}\) is an acid which on chemical reaction with each other leads to the formation of salt \((K_{3}PO_{4})\) and water \((H_{2}O)\).

Thus, we can conclude that the given reaction is a neutralization reaction.

The factors that most directly affect whether a chemical reaction occurs spontaneously are:

1. Temperature: Increasing the temperature generally speeds up chemical reactions. This is because higher temperatures provide more energy to the reactant molecules, increasing their kinetic energy and the likelihood of successful collisions. For example, when heating hydrogen and oxygen gases, they react more rapidly to form water at higher temperatures.

2. Concentration or Pressure: Higher concentrations or pressures of reactant molecules increase the frequency of collisions between them. This leads to a higher chance of successful collisions and thus increases the reaction rate. For instance, increasing the concentration of hydrogen gas in a reaction with nitrogen gas will lead to a faster reaction and the formation of ammonia.

3. Catalysts: Catalysts are substances that increase the rate of a chemical reaction without being consumed in the process. They work by providing an alternative reaction pathway with lower activation energy. This allows more reactant molecules to have enough energy to overcome the activation barrier and proceed to the products. For example, enzymes are biological catalysts that speed up chemical reactions in our bodies.

4. Nature of Reactants: The chemical composition and properties of the reactants can also affect whether a chemical reaction occurs spontaneously. Some reactions are more likely to occur because of the inherent instability or reactivity of the reactant molecules. For instance, the reaction between sodium and water is highly exothermic and occurs spontaneously due to the high reactivity of sodium metal.

It's important to note that while these factors influence the rate of a reaction, they don't guarantee that a reaction will occur. The concept of spontaneity in chemical reactions is related to thermodynamics, specifically the change in free energy (∆G) during a reaction. A reaction is spontaneous if ∆G is negative, indicating that the reaction will proceed without any external influence.

Overall, these factors collectively determine whether a chemical reaction occurs spontaneously or not, by affecting the collision frequency, energy, and stability of the reactant molecules.

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The factors that most directly affect whether a chemical reaction occurs spontaneously are Temperature, Concentration, Pressure, and Catalysts.

The spontaneity of a reaction is primarily determined by the change in Gibbs free energy (∆G) associated with the reaction. If ∆G is negative, the reaction is spontaneous, while a positive ∆G indicates a non-spontaneous reaction.

The factors that most directly affect whether a chemical reaction occurs spontaneously are the following:

1. Temperature: Increasing the temperature usually increases the rate of a chemical reaction. This is because at higher temperatures, the reactant particles have more kinetic energy, leading to more frequent and energetic collisions. As a result, the reactant molecules are more likely to overcome the activation energy barrier and react.

2. Concentration: Higher concentrations of reactants typically increase the rate of a chemical reaction. This is because when the concentration of reactant particles is higher, there are more collisions between them, leading to a higher probability of successful collisions and therefore an increased reaction rate.

3. Pressure (for gases): For reactions involving gases, increasing the pressure can also increase the reaction rate. This is because higher pressure leads to a higher concentration of gas particles, which in turn increases the frequency of collisions between them.

4. Catalysts: Catalysts are substances that can increase the rate of a chemical reaction without being consumed in the process. They achieve this by providing an alternative reaction pathway with a lower activation energy. By lowering the activation energy, catalysts make it easier for reactant particles to overcome the energy barrier and react, thereby speeding up the reaction.

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Answer:

The answer is C, Glucose is a compound, because it is made of more than one element.

Explanation:

Complete Question is ;

The chemical formula for glucose, a type of sugar, is C₆H₁₂0₆. Which statement is true about glucose?

1) Glucose is a compound because it's made from more than 1 element

2) Glucose is an element because it's made up from more than one kind of atom.

3) Glucose is an element because it can be separated.

4) glucose is a compound because is made of protons, neutrons and electrons

Solution ;

The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)

Aan element made entirely of one species of atoms, or an atom which has a specific number of protons in its nucleus.

Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

Three substances make up glucose: carbon, hydrogen, and oxygen. They are set at a fixed ratio of 1:2:1.

Covalent bonds, in which two atoms share bonding valence electrons in one or more bonds, are used to bind these atoms together.

Therefore, The statement which is true about glucose is (1) Glucose is a compound because it's made from more than 1 element. Hence the correct option is (1)

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Answer:

No

Explanation:

I dont at least but you may be lucky

It is not possible to determine the concentration of chlorine in the tank after 20 minutes. It takes approximately 2.96 minutes for the concentration of chlorine in the tank to reach 180 kg/m³.

The concentration of chlorine in a water treatment plant is to be determined as a function of time, as well as its concentration after 20 minutes and the time it takes to reach a concentration of 180 kg.

(a) (i) Using a mass balance equation, let C be the chlorine concentration in the tank and t be time. The mass of chlorine in the tank at any time, M(t), is M(t) = VC where V is the volume of water in the tank, which is initially 100 m3. The rate of change of chlorine concentration in the tank, dC/dt, is given by dC/dt = (1/V) dM/dt. Using the given values of the inlet and outlet rates, the rate at which chlorine enters the tank is dM/dt = 0.4 kg/m3 × 20 m3/min = 8 kg/min. The rate at which chlorine leaves the tank is given by the product of the concentration and the outlet rate. When the tank is initially filled with untreated water, the concentration of chlorine is zero.

Therefore, the rate at which chlorine leaves the tank initially is dM/dt = C × 10 m3/min = 0.This means that the concentration of chlorine in the tank remains zero until chlorine begins to enter the tank. Therefore, for t > 0, the differential equation is dC/dt = 8/(100 − 10t)Solving this differential equation gives C = ln(100 − 10t) + K where K is the constant of integration. The value of K can be found using the initial condition that the concentration of chlorine is zero when t = 0:C = ln(100 − 10t) − 2.3026

(ii) The concentration of chlorine in the tank after 20 minutes is C = ln(100 − 10(20)) − 2.3026= ln(−100) − 2.3026The value of the natural logarithm is undefined for negative numbers. Therefore, it is not possible to determine the concentration of chlorine in the tank after 20 minutes.

(iii) To find the time at which the concentration of chlorine in the tank reaches 180 kg/m3, set C equal to 180 kg/m³ and solve for t:180 = ln(100 − 10t) − 2.3026182.3026 = ln(100 − 10t)10t = 29.6493t = 2.9649 min. Therefore, it takes approximately 2.96 minutes for the concentration of chlorine in the tank to reach 180 kg/m³.

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Answer:

b

Explanation:

It's because parasites actually don't kill the host immediately but after at least a good time the host starts to experience some side effects which can lead to death