Determine whether each statement is an example of a physical change or a chemical change. Newspaper yellows in the sun. Physical chemical Wax melts on a hot stove. Physical chemical.

Liver contains digestive enzymes to break down harmful substances.

Digestive enzymes: Digestive enzymes are a group of enzymes which break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption into the cells of the body.

Digestive enzymes are found in the digestive tracts of animals (including humans) as well as in the tracts of carnivorous plants, where they aid in the digestion of food, as well as inside the cells, especially in their lysosomes, where they function to maintain the cellular survival.

Liver: The liver contains various digestive enzymes, such as liver alcohol dehydrogenase, which helps to break down toxic substances such as alcohol and drugs, and convert them into less harmful substances that can be excreted from the body.

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Answer:

A

Explanation:

In a cold front set-up, the boundary between the cold and warm air masses is relatively steep, typically causing the warm air in front of it to rise rapidly.

A cold front has been the transition zone that includes the replacement into the warmer zones. The cold air mass will be settled at the bottom and pushes the warm air to rise. Thus, option A is correct.

A cold front is said to be the bad weather conditions that are has been constituted by the cooler air mass. It is cold and dry air that moves from the "northwest to the southeast" direction. In an occluded front, the cold front meets the warm front.

When the cold air front meets the warm air front then, the cold air being denser settles at the bottom and results in pushing the warm air front in an upwards direction. The warm front has less dense air that rises in an upward direction.

Therefore, option A. the cold front moves the warm front in the upper direction.

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Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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An extremely efficient enzyme has a small KM and a large kcat.

The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.

complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.

A) small; small

B) small; large

C) large; large

D) large; small

E) kcat and KM do nothing to predict the efficiency of an enzyme

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The correct answer to the given question about phenylalanine is option d) Non-Polar.

A specific kind of amino acid is phenylalanine. Amino acids are the building blocks of proteins. Being an essential amino acid, phenylalanine is needed by humans and cannot be produced by the body on its own. Instead, humans must get their phenylalanine from the food they eat. Phenylalanine, a crucial -amino acid, has the chemical formula C9H 11NO 2. It can be pictured as either a benzyl group in place of the methyl group in alanine or as a phenyl group in place of the terminal hydrogen. This significant amino acid is classified as neutral and nonpolar due to the inert and hydrophobic nature of the benzyl side chain.

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Ar has three naturally occurring isotopes  ³⁶Ar, ³⁸Ar, and ⁴⁰Ar. Each contains 18 electrons and protons. The no of neutrons in ³⁶Ar, ³⁸Ar, and ⁴⁰Ar are 18, 20 and 22 respectively. The mass number of ³⁶Ar, ³⁸Ar, and ⁴⁰Ar are 36, 38 and 40 respectively.

Protons and neutrons are positively charged and neutral species respectively found in the nucleus of an element. Whereas, electrons are negatively charged species present in the orbitals surrounding the nucleus.

The sum of number of protons and number of neutrons of an element is called the atomic mass. It is represented by the symbol "A". And, atomic number is defined as the number of electrons present in an element. It is represented by "Z".

Isotopes are defined as the elements which have the same atomic number but their atomic masses are different. Number of proton is equal to number of electrons present in an element.

The atomic number of ³⁶Ar, ³⁸Ar, and ⁴⁰Ar is 18.

∴ Neutrons = atomic mass - atomic number

Neutrons of ³⁶Ar = 36-18 = 18

Neutrons of ³⁸Ar= 38- 18= 20

Neutrons of ⁴⁰Ar = 40- 18= 22

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Answer:

kenetic

Explanation:

Answer:

Explanation:

activation energy

The minimum amount of energy needed for a reaction to take place is called the activation energy .

Answer:

it would decrease [h+]

Explanation:

 This is due to  neutralization If a base is added to an acidic solution, the solution becomes less acidic and its position changes to the middle of the pH scale.

hope this helps

Answer:

Raise the pH

decrease [H+]

Explanation:

=> Adding base would raise the pH (Bases have more pH and Acids have less pH)

=> Adding base would decrease the concentration of [H+] ions as it contains hydroxyl ions which neutralized with H+ ions so as a result the concentration of [H+] ions decreases.

Controlling the flow rate of fluids is essential in our daily lives to ensure efficient use of resources and avoid damage to the system.

In everyday life, there are several situations where it would be useful to increase or reduce the flow of a fluid. Let's take a look at some of these situations below. Increasing the flow of a fluid:1. In a drinking straw: When we suck a drink through a straw, we are increasing the flow of the fluid.2. Watering plants: The water flow can be increased in a watering can to water plants quickly and efficiently.3. Showerhead: If the showerhead's water flow is increased, it can help us to clean ourselves faster and more efficiently.4. Washing dishes: If the flow of water is increased, it can help in washing dishes more efficiently. Reducing the flow of a fluid:1. Blood pressure: When a person has high blood pressure, reducing the flow of blood can help lower blood pressure levels.2. Water usage: Reducing the flow of water can save water when washing dishes, brushing teeth, or taking a shower.3. To avoid spills: A bottle that has a reduced flow rate can avoid spills when pouring liquid into a container.4. Plumbing: When the flow rate of water in the pipes is too high, it can cause damage to the plumbing system. Hence, reducing the flow rate can help avoid damage to the plumbing system.

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Answer: An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

Explanation:

The oxidation half reaction of Zn(s) is: Zn(s) → Zn2+ (a q) + 2e-.This half-reaction shows the loss of electrons by the Zn atoms, which are oxidized to Zn2+ ions.

In the redox reaction Zn(s) + Cu2+ (a q) → Zn2+ (a q) + Cu(s), Zn is the reducing agent, as it undergoes oxidation (loses electrons), and Cu2+ is the oxidizing agent, as it undergoes reduction (gains electrons). The overall reaction is a redox reaction, in which electrons are transferred from Zn to Cu2+, resulting in the formation of Zn2+ and Cu. The oxidation half reaction of Zn(s) shows the conversion of Zn(s) to Zn2+ (aq) and the loss of two electrons.

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The molarity of  an acid refers to the number of moles of the acid in the solution.

An acid refers to a substance that contains hydrogen ions as its only positive ion in solution. This is an aqueous media based definition of acids according to Arrhenius.

The molarity of  an acid refers to the number of moles of the acid in the solution. The negative logarithm of the molarity of the acid is the pH of the acid solution.

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The particle diagrams can be used to represent elements and compounds.

A particle diagram is a box where colored balls are drawn to represent an atom or molecule. These diagrams can be used to represent elements or compounds and their molecular structure by the type of balls and the way they are connected.

The particle model is useful to scientists for two main reasons. Firstly, it offers a rational explanation for how matter behaves. Secondly, it supports a fundamental idea—that the particles in matter are constantly changing. The matter that appears perfectly stable is not stable at all.

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The question is incomplete. The diagram in question is attached below.

Answer:

Three ways that waves may interact with matter are reflection, refraction, and diffraction. Reflection occurs when waves bounce back from a surface that they cannot pass through. Refraction occurs when waves bend as they enter a new medium at an angle and start traveling at a different speed.

Explanation:

When a light wave is interacted with an object, they are either transmitted, reflected, absorbed. The wave which exhibits both particle and wave nature interacts with matter in three different ways, they are refraction, reflection and diffraction.

The diffraction of the light is defined as the process of the bending of light around corners so that it spreads out and illuminates areas where a shadow is produced. The silver lining which we seen in the sky is caused because of the diffraction of the light.

The bending of a wave when it passes from one medium to another is known as the refraction. This bending is mainly produced because of the difference in density between the two substances.

When a light ray approaches a smooth polished surface and the light ray bounces back, it is defined as the reflection of light. It is the incident ray which is land on the surface is reflected off the surface.

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Answer:

Aluminium + oxygen = almininum oxide

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A chemical catalyst increases the rate of a reaction by decreasing the energy of activation.

In a chemical reaction, the presence of a catalyst increases the reaction rate in both forward and backward  reactions by providing an alternative pathway by lowering the activation energy.

Catalysts increase the rate of a reaction without being used up. With the presence of a catalyst in a certain reaction, more number of collisions take place,  so the rate of reaction increases.

When the activation energy is lowered, more reactants can cross the reaction barrier easily and so, the rate of reaction increases.

Therefore, we can say that the role of a catalyst is to lower the activation energy in order to increase the reaction rate.

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Answer:

Three formula units, Two Ammonium radical and Sulphate radical

Explanation:

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When the mixture of CaCl2 is made with water, it forms a solution that is 32.0% by mass. If the entire mass of the mixture is 645.4 g, we must determine the mass of the two components - CaCl2 and H2O.

In order to determine the mass of each component, we must first calculate the mass percent of each component in the mixture, as shown below:

Mass of CaCl2 in mixture

= 32% of 645.4 g

= 0.32 * 645.4 g

= 206.528 g  

Mass of H2O in mixture

= 100% - 32%

= 68% of 645.4 g

= 0.68 * 645.4 g

= 438.872 g.

Therefore, the mass of CaCl2 and water that was used are 206.528 g and 438.872 g respectively. As the solution was prepared by dissolving CaCl2 in water, these two values would have been the amount of CaCl2 and water used.

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The mass of 45.0 L of at 87.0° C and 950 mm Hg is therefore 72.181 g, we can deduce.

The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume).

Volume = 45.0 L

Temperature =87  = (87.0 + 273) K = 360 K

Pressure = 950 mm Hg (1 mm Hg = 0.00131579 atm) = 1.25 at

The following formula is used to calculate moles.

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature

As shown, enter the values into the formula above.

PV = nRT
1.25 atm* 45.0 L  = n * 0.0821 L atm /mol K * 360 K

n = 1.25 atm* 45.0 L / 0.0821 L atm /mol K * 360 K

n = 56.25 / 29.556

n = 1.90 mol

The mass of a substance divided by its molar mass is expressed in moles. The following formula is used to compute the mass of (molar mass = 37.99 g/mol).

Moles  = mass / molar mass

1.90 mol =  mass/37.99 g/mol

Mass = 72.181 g

The mass of 45.0 L of at 87.0° C and 950 mm Hg is therefore 72.181 g, we can deduce.

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1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

To burn 1 molecule of C3H8 completely, 5 molecules of O2 are required. This reaction can be written as follows:
C3H8 + 5O2 → 3CO2 + 4H2O
The balanced equation shows that for every molecule of C3H8 burned, 5 molecules of O2 are needed to completely react with the carbon and hydrogen in the fuel. This information can be useful for calculating the amount of oxygen required for a given amount of fuel, as well as for understanding the environmental impact of burning hydrocarbons.
To burn 1 molecule of propane (C3H8) in a complete combustion reaction, you need 5 molecules of oxygen (O2). The balanced chemical equation for this reaction is: C3H8 + 5O2 -> 3CO2 + 4H2O. In this reaction, 1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

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Answer:

Casts Molds Trace Fossils as well

Explanation:

Answer:

Do you need 3 ways or just one?

1. Temperature.

2. Pressure.

3. Polarity.

Explanation:

Eh hope these help, Idr understand the question but those are 3 ways to increase the solubility of a solid in water.

Answer:

a molecule of an element is called atomicity

To Find :

Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .

Solution :

We know, by ideal gas equation :

\(PV =nRT\\\\T = \dfrac{PV}{nR}\)

Here, R is universal gas constant and \(R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}\)

Putting all given values and R in above equation, we get :

\(T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K\)

Hence, this is the required solution.

The time, t, for a molecule to be transported by pure convection as a function of length, L, and velocity, v, is given by the expression:t = L/v(ii) Pure diffusion.

The time, t, for a molecule to be transported by pure diffusion as a function of length, L, and diffusion coefficient, D, is given by the expression:t = L²/2D

(b) Peclet number is defined as the ratio of convective to diffusive transport in a system. It is given by the expression:Pe = vL/Dwhere Pe is the Peclet number, v is the velocity, L is the length, and D is the diffusion coefficient.

(c) For a protein molecule with a diffusion coefficient of 2 x 10^-6 m2/s and convection velocity of 0.5 μm/s, the Peclet number is given by:Pe = vL/D

= (0.5 μm/s)(distance in μm)/(2 x 10^-6 m2/s)The results are as follows:i) For transport over a distance of 0.2 μm:

Pe\(= (0.5 μm/s)(0.2 μm)/(2 x 10^-6 m2/s)\)

\(= 25t(convection) = L/v = (0.2 μm)/(0.5 μm/s) = 0.4 s.\)

Therefore, diffusion is more dominant in this case.ii) For transport over a distance of 100 μm:

Pe =\((0.5 μm/s)(100 μm)/(2 x 10^-6 m2/s) = 2.5 x 10^4t(convection) = L/v = (100 μm)/(0.5 μm/s) = 2 x 10^2\)sTherefore, convection is more dominant in this case.
(d) The following are true and false statements:

1) True. Heat flux is measured in units of Watts.

2) True. The convective heat transfer coefficient depends on the roughness of the surface.

3) False. Radiation heat transfer is most efficient in a vacuum, not air.

4) False. Heat conduction can occur in solids, liquids, and gases.

5) False. Gravitational potential energy is a form of potential energy, not internal energy.

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Answer: He provided a 3 time period where there families appeal to there conviction.

Answer:

P₂ = 46.3 KPa

Explanation:

Given data:

Initial pressure = 54.5 KPa

Initial temperature = 19.0 °C (19+273 = 292 K)

New pressure = ?

Final temperature = -25°C (-25+273 =248 K)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

13.0 atm / 293 K = P₂/375 K

P₂ = 54.5 kpa × 248 K / 292 K

P₂ = 13516 KPa. K /292 K

P₂ = 46.3 KPa

Explanation:

acid ,HNO3

base,KOH

salt ,KNO3

While the simplified amino acid backbone, H2N-CH-COOH, provides a basic understanding of the fundamental components of an amino acid, it does not capture the complexity and diversity introduced by the R-group.

The given amino acid backbone, H2N-CH-COOH, represents a simplified representation of an amino acid structure. While it is true that amino acids consist of an amino group (H2N), a central carbon (C) with a hydrogen (H) and a carboxyl group (COOH) attached, the backbone alone does not accurately represent the actual structure of an amino acid in biological conditions.

In reality, the alpha carbon (the central carbon) of an amino acid is also bonded to a unique side chain or R-group, which distinguishes each amino acid from one another. The R-group can vary in size, shape, charge, and chemical properties, giving different amino acids their specific characteristics and functions.

The presence of the R-group significantly affects the overall structure, properties, and behavior of an amino acid. It influences interactions, such as hydrogen bonding, hydrophobic interactions, and electrostatic interactions, which are crucial for protein folding, stability, and functionality.

Therefore, while the simplified amino acid backbone, H2N-CH-COOH, provides a basic understanding of the fundamental components of an amino acid, it does not capture the complexity and diversity introduced by the R-group. The R-group is essential for the wide range of structures and functions observed in proteins under biological conditions.

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Answer:

Decomposition reaction

Explanation:

When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.

Option B is correct