For a particular reaction, ΔH° is 34.2 kJ and ΔS is 99.2 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction?

C) 80 protons

Mercury has 80 protons in its nucleus

C. 80 protons have Mercury

Food scientists need to understand chemistry for various reasons, including understanding the composition of food, ensuring food safety and quality, and studying the nutritional value of food.

Food scientists need to understand chemistry for several reasons. First, chemistry is necessary to understand the composition of food and how different chemicals interact with each other during processing, cooking, and preservation. Second, knowledge of chemistry helps food scientists ensure the safety and quality of food by understanding the potential chemical hazards and the best ways to prevent them. Third, chemistry is essential for studying the nutritional value of food and how the body metabolizes different nutrients.

the other variable is doubled.

Answer is: nuclear chain reaction.

For example fission of heavy isotope uranium-238.

The decay chain of ²³⁸U is called the uranium series.

Decay start with U-238 and ends with Pb-206. There are several alpha and beta minus decays.

The half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

In beta minus decay atomic number Z is increased by one, neutron is converted to a proton and an electron and an electron antineutrino.

Answer

The base is Ba(OH)2

Explanation

This equation follows the path of, acid +base---salt +water

H2S +Ba(OH)2------BaS +2H2O

Where H2S is the acid, Ba(OH) is the base and 2H2O is water.

Here, Barium hydroxide reacts with hydrogen sulfide to give barium sulfide and water.

In the provided reaction, the compound barium hydroxide (Ba(OH)2), acting as a base as it's capable of donating hydroxide ions.

In the given reaction, the compound acting as a base is Ba(OH)2. A base is a substance that can accept protons, or donate a pair of electrons. In this reaction, Ba(OH)2 is capable of donating a hydroxide ion (OH-), which classifies it as a base.

This behavior can be better understood considering the Arrhenius definition of bases, which describes a base as a substance that increases the concentration of hydroxide ions (OH-) when dissolved in water. Therefore, Ba(OH)2, with its capability to donate hydroxide ions, is acting as the base in this reaction.

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yes, it is balanced.

Answer is: Four hydrogen nuclei join to form a helium nucleus, two neutrinos, and energy.

Hydrogen fusion cycle involves four hydrogen nuclei and two electrons and form of helium nucleus, two neutrinos and six photons.

This process occurs in three steps:

1) Fusion of hydrogen into deuterium.

2) The the formation of helium-3.

3) Recombination of two helium-3 into one nucleus of helium.

This fusion nuclear reaction is in the inner core of the Sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).

Answer is: the average atomic mass 217.606 amu.

Ar₁= 203.973 amu; the average atomic mass of isotope.

Ar₂ = 205.9745 amu.

Ar₃ = 206.9745 amu.

Ar₄ = 207.9766 amu.

ω₁ = 1.40% = 0.014; mass percentage of isotope.

ω₂ = 24.10% = 0.241.

ω₃ = 22.10% = 0.221.

ω₄ = 57.40% = 0.574.

Ar = Ar₁ · ω₁+ Ar₂ · ω₂ + Ar₃ · ω₃ + Ar₄ · ω₄.  

Ar = 203.973 amu · 0.014 + 205.9745 amu · 0.241 + 206.9745 amu · 0.221 + 207.9766 amu · 0.574.

Ar = 2.855 amu + 49.632 amu + 45.741 amu + 119.378 amu.

Ar = 217.606 amu.

But abundance of isotopes is greater than 100%.

It should be lead, with the fourth isotope weighs 207.9766 amu and an abundance of 52.40.

Bromine vs Chlorine | Br vs Cl

Halogens are group VII elements in the periodic table, and all are electronegative elements and have the capability to produce -1 anions.

Bromine

Bromine is denoted by the symbol Br. This is in the 4th period of the periodic table between chlorine and iodine halogens. Its electronic configuration is [Ar] 4s2 3d10 4p5. The atomic number of bromine is 35. Its atomic mass is 79.904. Bromine staChlorine is an element in the periodic table which is denoted by Cl.  It is a halogen (17th group) in the 3rd period of the periodic table. The atomic number of chlorine is 17; thus, it has seventeen protons and seventeen electrons. Its electron configuration is written as 1s2 2s2 2p6 3s2 3p5. Since the p sub level should have 6 electrons to obtain the Argon, noble gas electron configuration, chlorine has the ability to attract an electron. ys as a red-brown color liquid at room temperature.

The atom with five outermost electrons, and ten inner electrons has been Phosphorus.

The energy levels in the atom have been the representation of the electron address. The electrons have been present in the energy level have been jumped from the lower level to the higher level.

The atom with five electrons in the outermost shell has belonged to group 15 of the periodic table. The inner number of electrons in the atom has been 10.

The total number of electrons are 15 in the atom. The element with 15 electrons has been Phosphorus.

Thus, the atom with five outermost electrons, and ten inner electrons has been Phosphorus.

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Answer:

The following compounds are arranged in increasing order:

Option D: F2<CO2<NH2CH3

The compounds in order of increasing strength of intermolecular forces are  F₂ < CO₂ < NH₂CH₃ . Therefore, option D is correct.

Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.

London's dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are the three different intermolecular forces. All substances at least have LDF, but molecules can have any combination of these three types of intermolecular interactions.

Because they affect how a substance behaves physically, intermolecular forces are significant. Since water can form hydrogen bonds with other molecules, many of its life-sustaining qualities, such its high heat capacity, are the result of intermolecular forces.

Thus, option D is correct.

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The first answer would be:

Measure the sequence of events on earth over time.

I believe the second answer would be:

The age of earth. ( I say this because geological time is used to describe timing and the relationship of events in earths history)

I’m not sure about number 3 but I hope this was somewhat useful!!

ANSWER: B) The heating element on a stove turning from black to orange.

The reason being is that, its a physical reaction, the color changes but the chemical structure of the element stays the same. A's changing and breaking down on a molecular level, that's a chemical reaction. Bleach bonded with the clothing making it from red to pink.

The answer would be A. It wouldn't be B because the gasoline is a chemical which lights when caught with air. Bleach is a chemical that can clean and change the color of things. I don't exactly know how bleach does those things , but I do know the answer would be A.

Tetraphosphorus pentasulfide

The covalent compound with the molecular formula P4S5 is named tetraphosphorus pentasulfide, using the numerical prefixes 'tetra-' for four atoms of phosphorus and 'penta-' for five atoms of sulfur.

The covalent compound P4S5 can be named using the appropriate numerical prefixes according to the rules for naming binary covalent compounds. In this case, the prefix for four is 'tetra' and the prefix for five is 'penta'. Therefore, the name would be tetraphosphorus pentasulfide.

To name the compound, first, identify the elements present: phosphorus (P) and sulfur (S). Then, apply the prefixes that correspond to the number of atoms of each element in the molecule: tetra- for four phosphorus atoms and penta- for five sulfur atoms. Combine these with the root name of the elements, and add the suffix '-ide' to the second element.

Nitrogen in this compound has 2 atoms. 2 multiplied by its mass, 14.007, equals 28.014. Divide 28.014 by the molar mass of calcium nitrate: 28.014/164 = 0.17081. Multiply this by 100 to achieve its percentage: 0.17081 x 100 = 17.08%

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metal and nonmetals.

The correct answer is 17.08%.

According to the question, Nitrogen in this compound has 2 atoms.

[tex]2 *4.007 = 28.014.[/tex]

[tex]\frac{28.014}{164} = 0.17081[/tex]

[tex]0.17081 * 100 = 17.08[/tex]%.

Hence, the correct answer is 17.08%.

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Some species that are isoelectronic with the iodide ion, I-, include the bromide ion, Br-, krypton, Kr, rubidium ion, Rb+, and tin ion, Sn2+.

The iodide ion, I-, has an atomic number of 53 and a charge of -1. To find species that are isoelectronic with the iodide ion, we need to look for ions or neutral atoms that have the same number of electrons as the iodide ion. The number of electrons in the iodide ion is 54 (53 protons + 1 extra electron).

Some species that are isoelectronic with the iodide ion, I-, include:

These species all have 54 electrons, which is the same as the iodide ion.

Final answer:

Some examples of species that are isoelectronic with the iodide ion, I-, include the chloride ion (Cl-), bromide ion (Br-), potassium ion (K+), and calcium ion (Ca2+).

Explanation:

The iodide ion, I-, has a charge of -1. To find species that are isoelectronic with the iodide ion, we need to find other ions or neutral atoms that have the same number of electrons as the iodide ion. Some possible examples are:

A cell is like a factory in many ways.

For one, the cell typically contains many organelles that have several varying functions. In a factory, you have many workers who perform different tasks, just as the organelles in the cell do.

Another reason is that cells contain a nucleus or the boss/brain of the cell. In factories, this could be considered the boss of the workplace that tells each and every worker, or organelle, what to do.

The selectively permeable membrane of a cell also resembles a factory as it only lets in workers or special guests. The cell's membrane only lets in specific materials, hence the selectively permeable membrane.

These are just a few ways as to how the cell is like a factory.

Hope this helps!

A cell is like a factory because it has different components that work together to perform specific tasks.

A cell is like a factory in many ways. Just like a factory, a cell has different components and organelles that work together to perform specific tasks. For example, the nucleus of a cell acts as the control center, similar to how the manager of a factory directs operations. The ribosomes in a cell can be compared to the assembly line in a factory, where proteins are produced. Lastly, the cell membrane acts as a barrier, allowing certain substances to enter or exit the cell, similar to how a factory may have gates or checkpoints to control the flow of materials in and out.

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Answer:

mark me as brainliest pls

Final answer:

Convection is the transfer of heat through the movement of fluids, such as the warm air circulation caused by a heater or the water cycling in a boiling pot.

Explanation:

Convection is a fundamental concept in Physics related to the movement of fluids (liquids or gases) as a result of heat transfer. When a fluid is heated, it becomes less dense and rises, whereas cooler fluid descends to take its place, creating a convection current. An everyday example of convection that we experience would be the warm air circulating in a room when a heater is on. As the heater warms the air, this air rises because it is less dense. Cooler air moves in to replace it, gets warmed up, and the cycle continues, resulting in a circulation of air and an overall warming of the room.

Another common example of convection is seen when you boil water in a pot. The water at the bottom gets heated first and rises to the surface, while the cooler water above descends to the bottom of the pot, creating a convection current that helps to evenly heat the water.

The answer is "right".

Answer: positive (right)

Explanation:

During resolution of vectors, any force or particle moving towards (north or east) direction are termed positive while vectors moving towards (west and south) are negative

Final answer:

When a substance does not dissolve in another substance, it is termed insoluble. Immiscible refers specifically to two liquids that do not mix, and solubility is the extent to which a substance dissolves.

Explanation:

When a substance does not dissolve in another substance, it is said to be insoluble. This term applies widely within the context of solutions in chemistry. For instance, sodium chloride is soluble in water but insoluble in hexane (C6H₁₄). Another important term is immiscible, which is used specifically when two liquids do not dissolve into each other, such as oil and water. This contrast with substances described as miscible, which can blend in all proportions to form a homogeneous solution, like ethanol and water. A partially miscible substance, like n-butanol in water, forms a solution only up to a certain concentration. An unsaturated solution can still dissolve more solute, whereas a saturated solution cannot dissolve any additional solute. Ionic compounds that are termed 'insoluble' still dissolve to some extent, just not in a significant enough amount to affect observations.

C: Solution is another name for Homogenous mixture

I know the answer to your question but if you want me to answer this question first, I need your help with my question "How do I solve number 12? Quick please I need help ASAP!!!"

sulfate because sulfate

Answer:

hydroxide

Explanation:

Hydroxides are highly soluble in water for example KOH. Carbonates, sulfates and phosphates are insoluble or sparing soluble in water. Sulfates of calcium, barium, strontium and lead are insoluble. The other remaining sulfates are soluble. Only phosphates and carbonates of ammonium, sodium and potassium are soluble. The other remaining phosphates are insoluble.

Sunspots are darker, cooler areas on the surface of the sun in a region called the photosphere. The photosphere has a temperature of 5,800 degrees Kelvin. Sunspots have temperatures of about 3,800 degrees K. They look dark only in comparison with the brighter and hotter regions of the photosphere around them. hope this helps

Answer:

A temporary procedure on the photosphere of the Sun, which seems as spots darker in comparison to the enclosing regions is known as sunspots. They are the areas of diminished surface temperature resulting due to the concentrations of the magnetic field flux, which prevent convection. The appearance of sunspots generally appears in pairs of reverse magnetic polarity. The size of sunspots vary and they can be as big as the size of the Earth, they are the dark spots created on the surface of the Sun, and usually enhances the overall energy of the Sun.

Answer is: addition.

For example, 1,3-butadiene is an unsaturated hydrocarbon.

1,3-butadiene is the simplest conjugated diene and undergoes 1,4 addition reaction in acidic environment.

Chemical reaction: CH₂=CH-CH=CH₂ + H₂O → CH₃-CH=CH-CH₂-OH.

CH₂=CH-CH=CH₂ - 1,3-butadiene.

CH₃-CH=CH-CH₂-OH - 2-buten-1-ol.

Diene or diolefin is a hydrocarbon that has two carbon double bonds.

Answer: This is known as addition reaction.

Explanation:

Unsaturated hydrocarbon is defined as the hydrocarbons which have double or triple covalent bond present between carbon and carbon atoms.

Addition reaction is defined as the reaction in which more atoms are added to the given compound. No atom is lost during this reaction.  

[tex]AB+C\rightarrow ABC[/tex]

This reaction is more favored by unsaturated hydrocarbons because they are more reactive due to the presence of [tex]\pi-[/tex]bonds. They are weaker than [tex]\sigma-[/tex]bonds and thus can be easily broken.

For Example: Hydrogenation of ethene molecule

[tex]H_2C=CH_2+H_2\rightarrow CH_3-CH_3[/tex]

Hence, the reaction is known as addition reaction.

Answer:

3) Vinegar

Step-by-step explanation:

Vinegar is a dilute solution of acetic acid. It has a sour taste and turns blue litmus red.

1)  NaOH and 3) lye are bases. They both have a slippery feel and turn red litmus blue.

2) Water is neutral. It is neither an acid nor a base.

The titration curves in comparing the titration of strong acids and bases with the titration of weak acids with strong bases. It is a high school level chemistry topic that explains how the pH changes during the titration process and illustrates the use of pH indicators.

titration process between hydrochloric acid (HCl) and sodium hydroxide (NaOH) and explain the expected titration curve.

In a titration, a base (NaOH) is slowly added to an acid (HCl) until the equivalence point is reached, where the moles of acid are stoichiometrically equal to the moles of base. The titration curve typically shows the pH of the solution as the volume of the titrant (NaOH) is added.

Initially, the pH is low due to the presence of excess HCl. As NaOH is added, the pH gradually increases, and a buffer region is observed where the pH changes more slowly. The buffer region is followed by a steep rise in pH near the equivalence point, signaling the consumption of the acid. After the equivalence point, the pH stabilizes at a higher value, indicating excess base.

Understanding the curve involves recognizing key points like the initial pH, buffer region, equivalence point, and post-equivalence behavior.

The solution in the flask past the arrow at point B on the curve can be best characterized as a solution of a strong base.

The curve is a titration curve for the titration of HCl by NaOH means that the pH of the solution in the flask is initially acidic (low pH) and then increases as NaOH is added.

Point B is past the equivalence point of the titration. The equivalence point is the point where all the acid has been neutralized by the base. At this point, the pH of the solution is neutral (pH 7).

Past the equivalence point, the pH of the solution increases rapidly with the addition of more base. This is because the excess base starts to react with the water in the solution, producing hydroxide ions (OH-). Hydroxide ions are responsible for the basic properties of a solution, so an increase in their concentration raises the pH.

Strong bases dissociate completely in water, meaning all their ionic bonds break apart and release ions and  results in a high concentration of hydroxide ions in the solution, even if a small amount of base is added.

Heating a pan of water until it evaporates is an example of matter changing state through vaporization, where liquid water becomes gas (steam). This physical change requires the molar heat of vaporization and keeps the water at its boiling point until all liquid has transitioned to gas.

In the scenario where matter is changing its state, heating a pan of water until the water is all gone corresponds to the process of water undergoing vaporization, which is a change from liquid to gas. This transformation occurs as heat is added to the water, increasing the kinetic energy of its molecules, thus causing the water to change its state. This phase change happens at 100 degrees Celsius at atmosphere pressure, known as the boiling point, and involves an isobaric process in which the pressure remains constant. The heat added during this process is referred to as the molar heat of vaporization, and during this phase transition, the temperature of the water does not increase further as the energy is being used to change the state rather than raising the temperature.

It's important to remember that during phase changes, there's no change in the total quantity of matter present due to the law of conservation of matter. The transition from one state to another, such as solid to liquid to gas, and the reverse, involves either the absorption or release of heat energy, but the actual amount of matter remains constant. Understanding these changes is crucial in various applications like cooling our drinks using ice cubes or refrigeration processes.