Assertion (A): Slaking of lime is an exothermic and combination reaction. Reason (R): Quick lime reacts with water to produce slaked lime.​

Answer:

the answer is A

Explanation:

i took the test on edg.                  sorry it is so late:(

Answer:A

Explanation:

Answer:

true

Explanation:

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The answers include the following:

Tendons are connective fibrous tissues that attaches muscle to bone and they have a bright white color together with a strong and smooth appearance which can be observed when studied.

Tendons are very important as they help in ensuring that the movement of parts of the body are easy due to its holding some structures such as ligaments in place. It is present in all bone joints due to its numerous functions in the musculoskeletal system of organisms.

The tendon is very flexible and binds the muscles in the body to other structures which is why it is referred to as a connective tissue and the above answers are the most appropriate.

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Answer:

boron

Explanation:

boron is a metaloid meaning it has the property of a metal and a non metal located where metals and non metals meet on the periodic table

Answer:

The answer is boron, the second answer is chlorine

Explanation:

edge 2022, have a great day h0mies

Answer:

Explanation:

Burning  paper is a chemical change.

Burning (or combustion ) is a high temperature chemical reaction that takes place  between fuel and an oxidant(mostly  oxygen)

Research has proved has taught us that ;

When paper is burned , the  oxygen (from the air) combines with carbon and hydrogen in the paper turning some of it into carbon dioxide and water vapor, which waft away with carbon particulates in the smoke

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The activation energy of a reaction with pre-equilibrium step having forward and reverse activation energies of 25 kJ/mol each can be calculated using the Eyring equation. The activation energy of the overall reaction is approximately 50 kJ/mol.

The activation energy of the overall reaction can be calculated using the Eyring equation:

k = (kBT/h) * exp(-ΔG‡/RT)

where k is the rate constant, kB is the Boltzmann constant, T is the temperature in Kelvin, h is the Planck constant, ΔG‡ is the Gibbs free energy of activation, and R is the gas constant.

The activation energy of the overall reaction can be calculated by finding ΔG‡, which is related to the activation energies of the pre-equilibrium step:

ΔG‡ = ΔG‡f + RT * ln(keq)

where ΔG‡f is the free energy of activation for the forward reaction, and keq is the equilibrium constant for the pre-equilibrium step.

Assuming the pre-equilibrium is fast, the equilibrium constant is close to unity, and the free energy of activation for the forward and reverse reactions are equal, so:

ΔG‡f = ΔG‡r = 25 kJ/mol

Substituting into the Eyring equation, we get:

k = (kBT/h) * exp(-ΔG‡/RT)

k = (kBT/h) * exp(-2*25 kJ/mol/RT)

Taking the natural logarithm of both sides, we get:

ln(k) = ln(kBT/h) - 50 kJ/mol/RT

This equation has the form y = mx + b, where the slope is -50 kJ/mol/RT. Therefore, the activation energy of the overall reaction is 50 kJ/mol.

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The average molecular mass of the gas, the average distance between the molecules, and the average speed of the molecules will all decrease when the sample of ideal gas is cooled from 50.0oC to 25.0oC in a sealed container of constant volume.

Here correct option is I.

This is due to the fact that the cooled gas molecules will have less energy and thus less kinetic energy to move around and interact with each other.

This decrease in energy results in a decrease in the average speed of the molecules, and thus a decrease in the average distance between them. Since the average distance between the molecules is reduced, the average molecular mass of the gas will also decrease.

The decrease in average speed of the molecules is due to the decrease in temperature of the gas. As the temperature decreases, the average kinetic energy of the molecules decreases, causing them to move slower.

This decrease in kinetic energy results in a decrease in the average speed of the molecules, and thus a decrease in the average distance between them. As the average distance between the molecules decreases, the average molecular mass of the gas will also decrease.

In conclusion, when a sample of an ideal gas is cooled from 50.0oC to 25.0oC in a sealed container of constant volume, the average molecular mass of the gas, the average distance between the molecules, and the average speed of the molecules will all decrease.

This is due to the fact that the cooled gas molecules have less energy and thus less kinetic energy to move around and interact with each other.

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The correct answer is 1.776 atm, which is the rounded value of the conversion from 1350 mmHg to atm.

To convert 1350 mmHg to atm, you need to use the conversion factor between millimeters of mercury (mmHg) and atmospheres (atm). The conversion factor is 1 atm = 760 mmHg.

To convert mmHg to atm, divide the value in mmHg by 760:

1350 mmHg / 760 mmHg/atm ≈ 1.776 atm

Therefore, 1350 mmHg is approximately equal to 1.776 atm.

It's important to note that the conversion factor of 1 atm = 760 mmHg is based on the definition of atmospheric pressure at sea level and at a specific temperature. The actual conversion may vary slightly depending on atmospheric conditions.

So, the correct answer is 1.776 atm, which is the rounded value of the conversion from 1350 mmHg to atm.

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The amount of oxygen that are required to react with 20.0 grams of octane ( C₈H₁₈ ) in the combustion of octane in gasoline is 70.03 g.

The balanced chemical equation for the combustion of octane (C₈H₁₈) is

2 C₈H₁₈ + 25 O₂ → 16 CO₂ + 18 H₂O

Molecular weight of C₈H₁₈ = 114.23 g/mol

Mass of octane = 20 g

Number of moles of octane = mass/mol.wt. = 20 g/(114.23 g/mol) =  0.175085354 mol

According to balanced equation,

2  mol of octane reacts with 25 moles of oxygen

So, 0.175085354 mol of octane would react with 0.175085354 mol × 25/2 = 2.188566926 mol of oxygen

Mass of oxygen = moles * mol.wt. = 2.188566926 mol × 32 g/mol = 70.03 g

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When we have an ionic compound, we have elements with different charges, cations are known for the + charges being carried by them, in this group of elements we found the metals. Within this group of elements, we have monovalent cations (Cs+ for example), divalent cations (Ca2+), but in the transition metals we find multivalent or polyvalent ions, like Fe, that can be Fe2+, Fe3+, and Fe4+, so these elements are able to carry different charges as cations, more examples of these multivalent ions are Copper, Zinc, Manganese, and many more.

Answer:

bacteria

Explanation:

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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Answer:

Solid---> Liquid

The concentration of a solution containing 29 grams of salt (NaCl) dissolved in 0.4 liters of water is 1.21 M. The molar mass of NaCl is 58.44 g/mol. Step-by-step solution: Given data: Mass of salt (NaCl) = 29 gVolume of water = 0.4 L = 400 mL.

To calculate the concentration of a solution, we use the formula: Concentration = Number of moles of solute/ Volume of solution (in liters). Here, the number of moles of solute will be calculated using the given mass of solute and its molar mass. Number of moles of NaCl = mass of NaCl/molar mass of NaCl = 29/58.44 = 0.496 mol Concentration of the solution = 0.496/0.4 = 1.24 M.

Other method: Calculate the mass concentration of salt (NaCl) in g/L: Mass concentration (m) = mass of solute/volume of solution in liters M = 29 g/0.4 L = 72.5 g/L. Now calculate the molarity (M) of the solution: M = (molar mass of NaCl * mass concentration (m))/1000M = (58.44 g/mol * 72.5 g/L)/1000M = 4.234/0.35M = 1.21 M. Thus, the concentration of a solution containing 29 grams of salt (NaCl) dissolved in 0.4 liters of water is 1.21 M.

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\(\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7-0}{0.1}\)

\(\\ \sf\longmapsto Acceleration=\dfrac{7}{0.1}\)

\(\\ \sf\longmapsto Acceleration=70m/s^2\)

Explanation:

the pressure and temperature of the air increase

reason:

the volume of the space containing air decreases.

Explanation:

Whether you know it or not, compressed air is involved in every aspect of our lives, from the balloons at your birthday party to the air in the tires of our cars and bicycles. It was probably even used when making the phone, tablet or computer you’re viewing this on.

The main ingredient of compressed air is - you guessed it! - air. Air is a gas mixture, which means it consists of many different gases. Primarily these are nitrogen (78%) and oxygen (21%).

The temperature of the air is directly proportional to the mean kinetic energy of these molecules. This means that the air temperature will be high if the mean kinetic energy is large (and the air molecules move faster). The temperature will be low when the kinetic energy is small.

Compressing the air makes the molecules move more rapidly, which increases the temperature. This phenomenon is called “heat of compression”. Compressing air is literally to force it into a smaller space and as a result bringing the molecules closer to each other. The energy that gets released when doing this is equal to the energy required to force the air into the smaller space. In other words, it stores the energy for future use.

Answer:

It's called A polar covalent bond

Answer:

Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or a sugar, into an alcohol or an acid. For example, yeast performs fermentation to obtain energy by converting sugar into alcohol.

Sometimes bacteria perform fermentation, converting carbohydrates into lactic acid...

You can look up videos of yeast fermentation in apple juice.

a) What is the mean value at 30% fraction saturation for 500 binding sites?

For 500 binding sites, the mean value (µ) at 30% fractional saturation (p = 0.3) can be calculated as:µ = where, n = total number of binding sites in hemoglobin (in this case, 500)p = fractional saturation (in this case, 0.3)

So,µ = 500 × 0.3 = 150

Oxygen molecules bound to hemoglobin: 150 is the mean value at 30% fractional saturation for 500 binding sites.

b) What is the standard deviation for the Gaussian distribution?

The standard deviation (σ) for the Gaussian distribution can be calculated as:σ = sqrt(np(1-p))So,σ = sqrt(500 × 0.3 × 0.7)σ = 8.66025

Therefore, the standard deviation for the Gaussian distribution is 8.66025.

c) What is the relative probability of having 125 binding sites occupied versus 250 binding sites occupied at 30% fraction saturation?

The relative probability can be determined using the Gaussian distribution formula: P(x) = (1 / (σsqrt(2π)))e^(-((x-µ)^2) / 2σ^2)

where, x = the number of binding sites occupiedµ = the mean valueσ = the standard deviation

Plugging in the values:

For x = 125:

P(125) = (1 / (8.66025sqrt(2π)))e^(-((125-150)^2) / 2(8.66025)^2)P(125) = 0.0398For x = 250: P(250) = (1 / (8.66025sqrt(2π)))e^(-((250-150)^2) / 2(8.66025)^2)P(250) = 1.125 × 10^-10

Therefore, the relative probability of having 125 binding sites occupied versus 250 binding sites occupied at 30% fractional saturation is 0.0398:1.125 × 10^-10 or approximately 3.54 × 10^8:1.

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Answer:

2.040 mol CO

Explanation:

First, write out your reaction:

CO + O2 --> CO2

Balance the reaction:

2CO + O2 --> 2CO2

Now divide the 32.65 g O2 by the molar mass of O2 (32.00 g/mol) to get moles of O2. Then multiply by the mole ratio of 2 mol CO for every 1 mol O2 to get moles of CO needed to fully react.

32.65 g O2 / 32.00 g/mol = 1.020 mol O2

1.020 mol O2 • 2 mol CO / 1 mol O2 = 2.040 mol CO

Answer:

The oxidation state of carbon in CaC204 is 3

False. A closed system permits mass exchange with the environment but not energy.

The mass of a something is the total amount of stuff or materials that make it up. The kilogram, or kg, is the symbol for the measurement units. It's important to remember that mass is distinct from gravity. Mass never changes, whereas weight fluctuates as the center of gravity shifts.

Knowing an object's mass is essential since it allows you to determine that however much power will be needed to move it. It is common practice to calculate the mass of an unspecified object using recognized units of weight such milligrams, grams, and kilograms. Anything with both mass and quantity is considered to be matter.

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More firmly than the substrate, an enzyme binds the product. False. An enzyme only has one use before it is no longer functional in the cell.

An enzyme's active site binds the reaction's substrate more firmly than the transition state intermediate does.

In a location on the enzyme molecule known as the active site, enzymes precisely and tightly bind both reactant molecules (referred to as the substrate) (Figurebelow).

Enzymes place reactants correctly so they do not have to resist intermolecular forces that would otherwise drive them apart by binding reactants at the active site. The molecules can now interact with less energy because to this.

Using alternate routes with lower activation energies may also be made possible by enzymes.

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False, Enzymes are biological catalysts that facilitate chemical reactions by lowering the activation energy required for the reaction to occur.

Enzymes do this by binding to the substrate(s) involved in the reaction and forming an enzyme-substrate complex. This complex is held together by a variety of non-covalent interactions such as hydrogen bonds, van der Waals forces, and hydrophobic interactions.

In some cases, the product(s) of the reaction may also bind to the enzyme, forming an enzyme-product complex. However, this complex is typically less stable than the enzyme-substrate complex, as the enzyme has evolved to release the product(s) once they are formed. The enzyme-substrate complex is usually held together more tightly than the enzyme-product complex, as the enzyme has a higher affinity for the substrate(s) than the product(s). Therefore, the statement "An enzyme binds the product more tightly than the substrate" is false.

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Answer: Rougher surfaces have more friction between them than smoother surfaces. That's why we put sand on icy sidewalks and roads. You can't slide as far across ice with shoes as you can on the blades of skates. The rougher surface of the soles of the shoes causes more friction and slows you down. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest.

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Answer:

To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 mole of the compound by the compound's molar mass and multiply the result by 100.

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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