Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

The concept of reversible change requires understanding that the system can quickly reach equilibrium.

A reversible change refers to a process that can proceed in both forward and reverse directions, meaning it can reach equilibrium. In a reversible process, the system can be considered to always be at equilibrium because it can shift between the forward and reverse reactions, maintaining a dynamic balance.

The term "spontaneous" is used to describe processes that occur naturally without the need for external intervention. In the context of reversibility, a reversible change can be considered spontaneous because it can occur spontaneously in both directions, forward and reverse, as long as the conditions allow it.

Therefore, the correct answer is "spontaneous."

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Answer: Slow so that the system can be considered to always be at equilibrium.

Answer:

equatorial region

Explanation: The absolute humidity in the equatorial region would be more than in the artic, because warm air holds more water vapor.

The equatorial region would have higher absolute humidity because as the altitude increases pressure decreases and even the relative humidity also decreases.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer:Ratio of proton to electron mass: 1,836.2.

Explanation:

A cyclic diallylamine called 1-ethyl-3-methylcyclohexane is a feedstock used to create methicillin-resistant Staphylococcus aureus (MRSA).

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The mass percent of the solute in the solution is 13.48%.

The formula for calculating mass percent in a solution is: Mass percent = (mass of solute ÷ mass of solution) × 100%.

Mass percent is a way of expressing the concentration of a solute in a solution. It is defined as the mass of the solute divided by the total mass of the solution, expressed as a percentage. To calculate the mass percent of a solute in a solution, you first need to determine the mass of the solute and the mass of the solvent, then use the formula:

Mass percent = (mass of solute ÷ mass of solution) × 100%

In the given question, the mass of the solute is 2.20 g, and the mass of the solvent is 14.1 g. Therefore, the total mass of the solution is 2.20 g + 14.1 g = 16.30 g. Substituting these values into the formula:

Mass percent = (2.20 g ÷ 16.30 g) × 100% = 13.48%

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Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

Answer: atoms/molecules

Explanation:

Answer:

ionic bonding or covalent

Explanation:

Answer:

C.) H₂O and K₂SO₄

Explanation:

This appears to be a double-displacement reaction. In these reactions, the cation of one substance is swapped with the cation of another.

So, K⁺ from KOH is swapped with the H⁺ from H₂SO₄. The new compounds should have an overall charge of 0. Therefore, it may be necessary to modify the amount of each ion (not just be 1:1).

K₂SO₄
-----> K⁺ and SO₄²⁻

-----> + 1 + 1 + (-2) = 0

H₂O

-----> H⁺ and OH⁻

-----> + 1 + (-1) = 0

True. The addition of Br2 to cyclopentene follows an electrophilic addition mechanism where the double bond of cyclopentene acts as the nucleophile attacking one of the Br2 molecules.

This results in the formation of a cyclic intermediate with a bridging bromine atom. The intermediate then breaks down to form the trans-1,2-dibromocyclopentane product. The "trans" in the name refers to the relative positions of the two bromine atoms on the cyclopentane ring. This reaction is stereospecific and yields only the trans isomer. The addition of Br2 to cyclopentene is an important reaction in organic chemistry and is commonly used for the synthesis of other compounds. In conclusion, the statement is true and can be explained by the electrophilic addition mechanism that occurs during the reaction.

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Cysteine is the amino acid that will most likely react with phosphine.

Cysteine contains sulfhydryl (-SH) groups that can form disulfide bonds (-S-S-) with other cysteine residues in a protein. This is important for maintaining the proper 3-dimensional structure of the protein.

Phosphine is a highly reactive gas that can react with the sulfhydryl groups of cysteine.

Methionine, on the other hand, is also a sulfur-containing amino acid, but it does not have the ability to form disulfide bonds. This means that it is unlikely to react with phosphine.

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Answer: Scientific reasoning

Explanation:

A scientific reasoning can be defined as the justification which connects the evidence with that of the claim and it rules out all those claims that are not supported by any evidence. It explains the fact that how evidence can support a claim and scientifically acceptable conclusion can be drawn. An argument is always based on one or more claims which can either be true or evidentially proved.

The example of a reaction to which Markovnikov's rule applies is: CH₂=CH-CH₂-CH₃ + HBr → CH₂Br-CH₂-CH₂-CH₃

In this reaction, the hydrogen atom from HBr adds to the carbon atom with the fewer alkyl substituents (less substituted carbon), while the bromine atom adds to the carbon atom with more alkyl substituents (more substituted carbon). This follows Markovnikov's rule, which states that in the addition of a protic acid (such as HBr) to an asymmetrically substituted alkene, the hydrogen atom adds to the less substituted carbon and the other atom adds to the more substituted carbon.

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Answer:

Explanation:

1 standard deviation range will look like: [average - SD, average + SD]

Here the miximum value will be: average - SD = 2.6 - 0.80 = 1.80 ml

and the maximum value will be: average + SD = 2.6 + 0.80 = 3.40ml

The energy is 150 kJ

The latent heat of fusion is the amount of energy required to change the state of a substance from a solid to a liquid, or vice versa, without changing its temperature. Specifically, it is the amount of heat energy that must be added to a substance to overcome the attractive forces between its molecules and break them free from their fixed positions in the solid lattice structure.

We know that;

H = mL

m = mass of the ice

L = latent heat of fusion in J/mol

Thus;

H = 25 mol * 5.99 KJ/ mol

H = 150 kJ

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Answer:

oil & mining are big in earth sciences

Answer:

false

Explanation:

there are lot of aspects of Mars that they are disconcerting still like scientists get paid a lot because of that astronomers get paid a lot because of that also.

Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)

How do you calculate a block of wood's volume?

Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?

It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.

How is block mass determined?

Multiply the volume and density together.

You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.

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Determine quantitative density of a liquid whose mass is 62 g and whose volume is 31 mL. A block or wood with the dimensions 3 cm x 2 cm x 5 cm and a heft of 22.5 g (2 g/mL)

Result for an image A timber block weighs 22.5 grammes and has dimensions of 3 cm x 2 cm x 5 cm. What is that?

It is simple to determine the volume of such a block, prism, a cylinder by multiplying the base's area by the object's height or altitude.

Multiply the volume and density together.

You may get the mass of your object by multiplying your two numbers together. You'll notice that you end up having units of mass if you keep track of both the units as you go along (kilograms or grams). A diamond, for instance, has a volume of 5,000 cm3 and a density of 3.52 g/cm3.

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Answer:

Q = 5949.35 J

Explanation:

Given that,

The mass of water, m = 189.5 grams

Initial temperature, T = 16.4 °C

Final temperature, T' = 8.9°C

We need to find the thermal energy the water use to melt the ice cube. The thermal energy is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat of the water, c = 4.186 joule/gram °C

So,

\(Q=189.5\times 4.186 \times (8.9-16.4)\\Q=-5949.35\ J\)

So, the required amount heat is equal to 5949.35 J.

Answer:

The volume of the tank can be calculated using the ideal gas law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.

In this case, we have P = 179 atm, n = 7.75 moles, R = 0.08206 Latm/(Kmol), and T = 295 K. Plugging these values into the ideal gas law equation and solving for V gives us:

V = (nRT)/P V = (7.75 moles * 0.08206 Latm/(Kmol) * 295 K) / (179 atm) V ≈ 1.01 L

So the volume of this tank at these conditions is approximately 1.01 liters.

Explanation:

Answer:

Volume = 1.05 L (3 s.f.)

Explanation:

To find the volume of the tank, we can use the ideal gas law.

\(\boxed{\sf PV=nRT}\)

where:

The given values are:

Substitute the given values into the formula and solve for V:

\(\implies \sf 179 \cdot V=7.75 \cdot 0.082057366080960\cdot 295\)

\(\implies \sf V=\dfrac{7.75 \cdot 0.082057366080960\cdot 295}{179}\)

\(\implies \sf V=\dfrac{187.6036532 \dots }{179}\)

\(\implies \sf V=1.04806510 \dots\;L\)

\(\implies \sf V=1.05\;L\;(3\;s.f.)\)

Therefore, the volume of the tank in these conditions is 1.05 liters (3 s.f.).

Answer:

the wing shape and color

Consequently, the protein molecule has a length of 315 x 10^-9 metres.

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The chemical reaction taking place to let the meat be tenderized when it is soaked in lemon juice or vinegar is called denaturation.

Denaturation is a process where the protein structure of the meat changes due to the acidity of the lemon juice or vinegar. The acidity breaks down the proteins, making the meat more tender. This is why meat is often soaked in an acidic liquid such as lemon juice or vinegar to tenderize it.

Meat is left tenderized by soaking in a liquid like lemon juice or vinegar for several hours because the acid in the vinegar or lemon juice breaks down the proteins in the meat. The acidity breaks down the proteins, making the meat more tender and easier to chew. Vinegar and lemon juice work so well to tenderize meat because they contain acid. Denaturation is the process by which proteins are altered due to changes in pH, temperature, or other conditions. When meat is soaked in vinegar or lemon juice, the acid denatures the proteins in the meat, making it more tender.

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A chemical property is a characteristic of a substance that is observed during a chemical reaction, as opposed to a physical property, which is a characteristic that can be observed without altering the substance's chemical makeup.

A detailed explanation:

Chemical properties describe how a substance reacts with other substances. For example, a substance's flammability, or its ability to burn, is a chemical property. Other examples of chemical properties include a substance's reactivity, toxicity, and acidity or basicity.

Chemical reactions involve changes in the chemical makeup of a substance, and these changes can often be observed through changes in color, temperature, or other physical properties. For example, when iron rusts, it changes from a shiny silver color to a dull red-brown color, indicating a change in the chemical makeup of the iron.

Chemical properties can also be used to identify a substance. For example, a substance's reactivity with certain chemicals or its ability to conduct electricity can be used to identify it. Additionally, the chemical properties of a substance can be used to predict how it will react with other substances.

It's important to note that chemical properties are different from physical properties, which are characteristics of a substance that can be observed without altering its chemical makeup. Examples of physical properties include a substance's color, density, and melting point. While chemical properties describe how a substance reacts with other substances, physical properties describe the substance itself.

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Answer: Matter takes up space and has mass

Explanation:

Literally the definition of mass

The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the crystal-field splitting is 235kJ/mol.

The crystal field theory accounts for the color of transition metal ions on the bases of splitting of d orbitals. The energy of the spliting is obtained from the wavelength in the visible spectrum.

Now the wavelength is  509 nm hence the energy is obtained from;

E = 6.6 * 10^-34 * 3 * 10^8/509 * 10^-9 * 6.02 * 10^23/1 mol * 1/1000 kJ

= 235kJ/mol

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Answers

A and D

Explanation

Biomass fuel is produced from organic materials, so trees and corn plants apply.

c) The rates of the forward and reverse reactions are equal. When the forward and reverse processes move ahead and backward at the same pace, with no discernible change in the system, this is referred to as dynamic equilibrium for reversible processes.

Dynamic equilibrium occurs when, given a reversible process, the rate of the forward reaction equals the rate of the reverse reaction. Although it appears that nothing is happening because the two rates are equal, the reaction is actually continuing at its steady rate. The equilibrium state is one in which there is no net change in the concentrations of reactants and products. The opposite is true; at equilibrium, both forward and reverse reactions proceed at the same rate, maintaining the net concentrations of reactants and products as is.

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Electromagnetic forces are forces that arise between electrically charged particles. They are the result of the interaction between their electromagnetic fields and occur due to the exchange of photons, which carry the electromagnetic force.

These forces can act over long distances and are responsible for various phenomena, including the repulsion or attraction of charged objects.

When it comes to the phenomenon of two oranges repelling each other, it can be explained by the presence of charged particles within the oranges. Oranges contain a large number of charged particles, approximately 10^29. These charged particles consist of negatively charged electrons and positively charged protons.

When two oranges are brought close together, the like charges within them (negative charges from electrons or positive charges from protons) create electromagnetic forces. According to Coulomb's law, like charges repel each other. As a result, the oranges experience a repulsive force that causes them to push away from each other.

In conclusion, the repulsion of two oranges when brought together is due to the electromagnetic forces generated by the like charges within the oranges. The negatively charged electrons and positively charged protons within the oranges create forces of repulsion, causing the oranges to repel each other. This phenomenon can be explained by the principles of electromagnetism and Coulomb's law.

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Explanation:

0 10 grams that that should be the answer

Answer: 1 mole 

Explanation: