Determine whether each of the preceding is exothermic or endothermic Drag the items into the appropriate bins. Reset Help exothermic endothermio Part B Indicate the sign of Δ H Drag the items into the appropriate bins. a. natural gas burning on a stove b. isopropyl alcohol evaporating from skin c. water condensing from steam

The world would be dark without sunlight. Animals, vegetation, and people would not exist. Without other life, there wouldn't be any.

There won't be any light from the Moon. Only because sunlight reflects off of the Moon can we see it. The Moon would vanish as the sunlight that was illuminating it did. The numerous other celestial objects in the sky, such planets, that humans can only see because of the Sun's reflected light, would also fall under this category.

Earth would swiftly become much colder without the Sun's warmth. Fortunately, Earth's ability to retain heat means that humans wouldn't immediately freeze. But life would start getting much harder right away.

Although no one can foresee the future with certainty what will happen, scientists believe that within a week or so, the average worldwide surface temperature would fall below 0 degrees Fahrenheit. You've probably endured temperature like these before during the chilly winter months.

The issue is that the temperature would keep progressively dropping. The average surface temperature of the entire planet might fall much below -100° F in just one year! The world's sea's surface layers would have frozen over by then. Although the deep waters below would be kept liquid for hundreds of thousands of years by the frozen upper layers of the oceans, they would finally freeze as Earth headed toward a stable average global surface temperature of roughly -400° F. Any remaining humans would then be exposed to the severe cosmic radiation that comes from space because the atmosphere would likewise have frozen and dropped to Earth by that time.

All photosynthesis on Earth would cease if the Sun's rays were to disappear. All living things that depend on plants for food, including humans, will eventually perish along with all plants. While some resourceful people might be able to live without the Sun for a few days, weeks, or even years, it would eventually become impossible to sustain life on Earth.

Hence, There will be no life on earth because sun is the ultimate source.

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The balanced equation is CH4(g)+2O2(g)→CO2(g)+2H2O(g) In the burning reaction, methane (CH₄) reacts with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O): CH₄ + 2 O₂ → CO₂ + 2 H₂O

This reaction obeys the law of conservation of mass because nothing was created or destroyed just rearranged.

This means that the total mass of reactants and products involved in the equation must be the same. A balanced chemical equation always obeys the law of conservation of mass. According to this law, the mass of the product must equal the mass of the reactants. A chemical reaction is said to be balanced when the total mass of the atoms on both sides of the chemical reaction is equal.

According to this law, both physical and chemical changes follow the law of conservation of mass. Nuclear reactions are the only ones that do not obey the law of conservation of mass. In chemical reactions, atoms are neither created nor destroyed. Reactant atoms simply rearrange to form products. Therefore, there is no mass change in chemical reactions.

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Is the source an authority on the subject? Option C.

Authorship is a concept that represents the authority an individual author has established on the web for a particular topic. Authors publishing on trusted sites build permissions and apply them when publishing on other platforms. A good example of a traditional system of power is a monarchy.

Most governments throughout history have ruled under this form of authority. In this form of rule, the subject accepts the nature of authority. They refrain from challenging the traditional rights of powerful groups and individuals. can be defined as Permissions that are important in determining a website's credibility. To determine who is responsible for the website who wrote the information etc.

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Alcohols are produced via the two step hydroboration-oxidation process. In an Anti-Markovnikov process, the boron connects to the alkene bouble bond's least substituted carbon while the hydrogen (from BH3 or BHR2) attaches to the more substituted carbon.

A limiting reagent is one that is completely consumed during a reaction, hence restricting the product's yield. Compared to the limiting reagent, the other reactant(s) are present in excess. The amount of product that could be produced based on the molar ratios is known as the theoretical yield. The amount that was actually retrieved is divided by the theoretical yield to determine the percent yield. For this amount to be expressed as a percentage, multiply it by 100.

A chemical process called oxidation occurs. As a result of atoms or groups of atoms losing electrons, it is described as a process. The addition or loss of oxygen or hydrogen in a chemical species is another method to define oxidation. When these things happen, oxidation occurs.

When an atom, molecule, or ion loses one or more electrons during a chemical reaction, oxidation takes place. The chemical species' oxidation state increases while oxidation takes place. Oxygen is not always necessary for oxidation to occur. The phrase was initially used when oxygen produced an electron loss during a process.

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Measuring the change in molarity after adding the KI, the heat generated by adding the KI, or the time it takes the I2 precipitate to form would not provide information about the limiting reactant, as they are not directly related to the amount of iodine that can be formed.

What is Precipitation?

Precipitation is a chemical reaction that results in the formation of a solid product from a homogeneous solution. The solid product is called a precipitate and is formed when the dissolved ions or molecules in a solution react chemically with each other to form a compound that is insoluble in the solvent.

To determine the limiting reactant in the given reaction, the student could measure the weight of iodine (I2) precipitate that forms at the end of the reaction. This is because the limiting reactant is the reactant that is completely consumed during the reaction, and in this case, the reactant that limits the amount of iodine that can be formed.

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The two options are forms of kinetic energy are : the sound energy and the thermal energy.

The two forms of kinetic energy are : the sounds energy and the thermal energy. The kinetic energy is the type of energy that an object posses because of its motion. The five forms of the kinetic energy are : The mechanical energy , the electrical energy , the light energy , the thermal energy and the sound energy. so, the kinetic energy is the energy due to the motion of object.

Thus, The two options are forms of kinetic energy are : the sound energy and the thermal energy.

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The bond order for any molecule having an equal number of bonding and antibonding electrons is zero.

The "degree" of the bond is best described by the bond order. For instance, the bond order of a triple bond is 3, while the bond order of double bond is 2. One can imagine that each electron contributes to the bonding or antibonding characteristic. Half of the bonding feature is contributed by each electron in a bonding molecular orbital. Half of the antibonding feature is contributed by each electron in an antibonding molecular orbital. Bond order is zero when bonding and antibonding character are equal. Therefore, the bond order is 0 when the number of bonding and antibonding electrons is equal.

Mathematical proof is also possible.

Bond Order: ½(Antibonding electrons - bonding electrons)

When both are equal. Suppose number of both electrons is x then,

Bond Order: ½(x – x) = 0

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Acetone is avoided because can harm the nervous system. Symptoms include headache nausea dizziness lightheadedness and confusion. Severe exposure may result in unconsciousness. Skin Contact May cause slight irritation.

Do not breathe vapors. Avoid contact with eyes skin and cloth. Keep the container tightly closed when not in use. The storage area should be cool, well-ventilated, and away from sources of ignition and heat. Breathing or swallowing large amounts of acetone in a short period of time can cause headaches confusion nausea increased heart rate changes in blood cell size and count and unconsciousness or coma.

Inhalation of acetone may irritate the nose throat lungs and eyes. Acetone occurs in humans as a byproduct of fat metabolism. Excessive accumulation of acetone to levels that the liver has difficulty breaking down results in severe acetone toxicity. Volumes of 10-20 liters have no serious effects. However, volumes over 50 L are considered toxic.

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Crust and mantle are the layers made up of rock whereas the inner core and outer core are not made up of rock.

The mantle is present below the crust which is about 2900 km thick. It comprises hot, dense rocks made up of iron and magnesium. The crust and the upper portion of the mantle make up the lithosphere which is divided into plates that is large and small.

Earth has three layers i.e. the crust, mantle, and core. The crust is made of solid rocks as well as minerals. The mantle layer is present beneath the crust layer which is also mostly made up of solid rocks and minerals as well as semi-solid magma.

So we can conclude that Crust and mantle are rocky layers whereas the inner core and outer core are not.

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Answer:

Valence Electron

Explanation:

Valence electron

The outermost electrons that are free to move between atoms in metals is called as Electro positivity.

What do you mean by electropositivity?

"Electropositivity is the propensity of an atom to donate electrons and generate positively charged cations," says the definition. The majority of metallic elements, especially the alkali metals and the alkaline earth metals, exhibit electropositivity.

Example: A strongly electropositive element like sodium, for instance, rapidly gives up an electron to achieve a stable electronic state. Contrarily, chlorine is a very electronegative element that rapidly receives an electron to form a stable octet. In order to produce sodium chloride, sodium and chlorine can thus create an ionic connection (an ionic salt with the chemical formula NaCl).

Hence, the outermost electrons that are free to move between atoms in metals are termed Electro positivity.

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The most common form of kinetic energy that is released from chemical energy in chemical reactions is Thermal Energy.

What do you mean by Thermal energy in chemistry?

Thermal energy is also referred to as heat energy. It is produced when a rise in temperature which causes atoms and molecules to move faster and collide with each other. The energy that is generated due to the temperature of the heated substance is called thermal energy.

Examples of thermal energy include : Solar Energy. Solar radiation, Geothermal Energy ,Heat Energy From the Oceans and  Fuel Cell Energy.

There are three types of thermal energy transfer

Hence, the most common form of kinetic energy that is released from chemical energy in chemical reactions is Thermal Energy.

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9.577  is the ph of a buffer system prepared by dissolving 10. 70 grams of nh4cl and 35. 00 ml of 12 mol l-1 nh3 in enough water to make 1. 000 l of solution.

Mass ,NH4Cl = 10.7 g

Volume ,NH3 = 35 mL = 0.035 L

Molarity NH3 = 12 M

no. moles of NH4Cl = mass/molar mass

Molar mass, NH3 = 53.49 g/mol

no. moles  NH4Cl = 10.7/53.49

no. moles NH4Cl; n_acid = 0.2 mol

no. moles NH3 = Volume × molarity

no. moles of NH3 = 0.035 × 12

no. moles NH3;  base = 0.42 mol

kb = 1.8 × 10^(-5)

Pkb = -log kb

Pkb = -log(1.8 × 10^(-5))

Pkb = 4.745

Pka = 14 - Pkb

Pka = 14 - 4.745

Pka = 9.255

PH = Pka + log(n_base/n_acid)

PH = 9.255 + log(0.42/0.2)

PH = 9.577

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The vaporization of liquid water to steam at a pressure of 1 atm is given. then a) endothermic; b) above 100 °C; c) below 100 °C ; d)100 °C.

Phase transition from the liquid phase to vapor is called Vaporization. Types of vaporization are as : evaporation and boiling, in which evaporation is a surface phenomenon and boiling is a bulk phenomenon.

a)The vaporization of water requires addition of the heat of vaporization for the given mass of water and also the heat required to raise the water to the boiling point.

b)The boiling of water is a spontaneous process above the boiling point for water that is 100 °C.

c)It is a non-spontaneous process below the boiling point of water that we know is 100 °C.

d) The two phases are in equilibrium at 100 °C.

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Answer: it transfers out of the metal the heat stops and the energy is absorbed by other things

Explanation:

Moles of p-nitrobenzaldehyde is  0.001985mol.

What do you mean by Cannizzaro Reaction?

Cannizzaro reaction is a chemical reaction named after Stanislao Cannizzaro that involves the base-induced disproportionation of two molecules of a non-enolizable aldehyde to yield a carboxylic acid and a primary alcohol.

theoretical yield of p-nitrobenzoic acid

=0.001985 mol p-nitrobenzaldehyde*1mol p-nitrobenzoic acid/2mol p-nitrobenzaldehyde*167.12g/1mol

=0.166g

theoretical yield of p-nitrobenzyl alcohol

=0.001985mol p-nitrobenzaldehyde*1mol p-nitrobenzyl alcohol/2mol p-nitrobenzaldehyde*153.12g/1mol

=0.152g

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Answer:

In a chemical reaction, the number of atoms of each element involved must remain the same. This can be observed when baking soda and vinegar are mixed together in a dry bottle. The atoms of each element are rearranged to form new compounds, but the total number of atoms does not change.

Fermentation can be defined as an anaerobic process in which energy can be released from glucose even if oxygen is not available.

Explain the above process.

1.Sucrose in presence of yeast gives Ethanol + CO2

The evolution of CO2 is the reason of inflation, if sugar is not present in the any of the flask reaction doesn't occur and no inflation.

2.The optimum temperature range for yeast fermentation is 32-35 degree Celsius.

Optimum pH range is 4.0-8.5

Carbohydrates containing food are best for fermentation.

Products of fermentation are alcohol and CO2. Type of alcohol depends on the type of food used for fermentation.

3. Litmus paper turns red because the product is alcohol.

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The final temperature of the solution based on the heat change is 21.1

°C.

The final temperature of the solution formed when 50.0 mL of 0.800 M calcium nitrate are added to 50.0 mL of 1.600 M sodium fluoride is calculated as follows:

moles of Ca⁺ = 50 * 1/1000 * 0.8

moles of Ca⁺ = 0.04 moles

moles of F⁻ = 50 * 1/1000 * 1.6

moles of F⁻ = 0.08 moles

Equation of precipitation reaction:

Amount of heat released by 0.04 moles of Ca²⁺ = -11.5 * 0.04

Amount of heat released by 0.04 moles of Ca²⁺ = 0.46 kJ or 460 kJ

mass of solution = volume * density

mass of solution = 100 * 1 g/mL

mass of solution = 100 g

Temperature change = 460 / (100 * 4.18)

Temperature change = 1.1 °C

Final temperature = 20.00 + 1.100 °C

Final temperature = 21.1 °C

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Complete question:

When 50.0 mL of 0.400 M Ca(NO3)2 is added to 50.0 mL of 0.800 M NaF, CaF2 precipitates, as shown in the net ionic equation below. The initial temperature of both solutions is 30.00°C. Assuming that the reaction goes to completion and that the resulting solution has a mass of 100.00 g and a specific heat of 4.18 J/(g ∙ °C), calculate the final temperature of the solution.

Ca²⁺ (aq) + 2 F⁻ (aq) → CaF₂(s)  ΔH° = -11.5 kJ

Simmons citrate agar includes other nutrients, the pH indicator bromthymol blue, sodium citrate as the only source of carbon, and ammonium dihydrogen phosphate as the only source of nitrogen. This test, which is a component of the IMViC assays, is useful for identifying various Enterobacteriaceae.

The primary source of nitrogen in atmospheric deposition is the combustion of fossil fuels like coal and oil. Nitrogen may be deposited in the atmosphere as dry particulates, gases, and droplets or as a wet form such as rain, snow, hail, fog, and freezing rain.

For life, the elements carbon and nitrogen are crucial. All living organisms depend on them for the molecular building blocks of their cells and tissues.

A widespread genus of Gram-negative, facultatively anaerobic, rod-shaped, non-spore-forming bacteria belonging to the Enterobacteriaceae family is called Enterobacter. It belongs to the type genus of the Enterobacterales order.

Animal intestines serve as the organisms' primary natural habitat, hence the name Enterobacter (from the Greek enteron, which means "intestine"). Enterobacter are omnipresent in nature and are widely dispersed in sewage, water, and soil as a result of their presence in animal intestinal tracts.

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The calculated percentage yield will not change because in this reaction acetone is the limiting reactant and not benzaldehyde. Hence, the excess amount of benzaldehyde does not affect the yield.

The percentage yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. It determines how much of the reaction is completed.

In the reaction of benzaldehyde with acetone the yield of the precipitate dibenzalacetone is dependent on the acetone since it is the limiting reactant which determines the amount of product.

Therefore, the changed amount of benzaldehyde does not affected to the yield.

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Your question is incomplete. But your complete question was as follows:

In step #2 of the procedure, you weighed out and used 2 g of benzaldehyde instead of 1. 17 g .Would the calculated percentage yield of the precipitate (dibenzalacetone)

be too high

, too low, or

unaffected by the following?

Ocean acidification refers to a reduction in the pH of the ocean over an extended period of time, caused primarily by the uptake of carbon dioxide (CO2) from the atmosphere.

Because of human-driven increased levels of carbon dioxide in the atmosphere, there is more CO2 dissolving into the ocean. The ocean's average pH is now around 8.1, which is basic (or alkaline), but as the sea continues to absorb more CO2, the pH decreases and the ocean becomes more acidic.

How does ocean acidification affect us?

Ocean acidification can modify the abundance and chemical composition of harmful algal blooms in such a way that shellfish toxicity increases and, therefore, human health are negatively affected.

How we can reduce ocean acidification?

The most effective way to limit ocean acidification is to act on climate change, implementing solutions to dramatically reduce the use of fossil fuels. If we dramatically cut our global warming emissions, and we limit future warming, we can significantly reduce the harm to marine ecosystems.

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The partial pressure of C₂HBrClF₃ and O₂ are 84 torr and 778 torr respectively.

Given,

Mass of C₂HBrClF₃ = 15.0 g

Mass of O₂ = 22.6 g

Molar mass of C₂HBrClF₃ = 197.4 g/mole

Molar mass of O₂ = 32 g/mole

Raoult's Law:

Psolution = ΧsolventP0solvent

Psolution = vapour pressure of the solution

Χsolvent  = mole fraction of the solvent

P0solvent = vapour pressure of the pure solvent

What is Raoult's Law?

According to Raoult's law, a solvent's partial vapour pressure in a solution (or mixture) is equal to or identical to the pure solvent's vapour pressure multiplied by its mole fraction in the solution.

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The lenght multiply with the tall and the tichkness

Any material such as in this case the gummy bear’s “skin” acts as a selectively permeable membrane if it allows the passage of certain substances from both sides of the barrier.

A selectively permeable membrane is any barrier that allows the movement of substances to both sides in regard to concentration gradients or the presence of certain structures such as channel proteins in the case of the cell membrane.

Therefore, with this data, we can see that a selectively permeable membrane such as the cell membrane allows the movement of substances between both sides of the barrier in a selective way.

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The potential charge an atom would have if every one of its links to other atoms were fully ionic is known as the oxidation state, also known as the oxidation number. It describes how much an atom in a chemical molecule has been oxidized. The oxidation state can theoretically be positive, negative, or zero.

FeBr3

Br will remain in its normal oxidation state, which is -1, because it is more electronegative than Fe.

Let Fe's oxidation state now be "x."

x + (3*-1) = 0

=> x = +3

Answers: Fe : +3 & Br : -1

The total number of electrons that have been removed from an element (creating a positive oxidation state) or added to an element (creating a negative oxidation state) to get it to its current state is the oxidation state of an atom.

One of these oxidation laws states that a free, neutral element has an oxidation number of zero. A monoatomic ion's charge is the same as its oxidation number. For Group IA elements, the oxidation number is always 1. For Group IIA elements, the oxidation number is always +2.

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The number of moles of He atoms present in 5.55 g of He is 1.3 moles

Mole is the SI unit of amount of substance of a specified elementary entity and the the helium is the chemical element and inert gas element

Here given data is

He =  5.55 g

Molar mass of He = 4.0g/mol

So number of moles =  5.55 g of He × 1 mol/4.0g/mol

Number of moles = 1.3 mole

The number of moles of He atoms present in 5.55 g of He is 1.3 mole

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Yes, mass is conserved when 40 g of sodium hydroxide undergoes a chemical change during an interaction with 36.5 g of hydrogen chloride

What is the law of  conservation of mass?

According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.

It is believed that there are a few assumptions from classical mechanics which define mass conservation. Later the law of conservation of mass was modified with the help of quantum mechanics and special relativity that energy and mass are one conserved quantity. In 1789, Antoine Laurent Lavoisier discovered the law of conservation of mass.

Any chemical reaction must follow the law of conservation of mass. Meaning that mass cannot be created nor destroyed. Since all chemical reactions must follow this law, no matter what reaction happens, mass is conserved.

NaOh + HCL - NaCl +H2O

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Phenol and bromomethane are the major products obtained upon treatment of methyl phenyl ether with excess HBr.

What do you mean by Phenol and Bromomethane?

Phenols  are a class of chemical compounds which consist of a hydroxyl group (—OH) bonded directly to an aromatic hydrocarbon group. The simplest of the class is phenol, C6H5OH. Friedlieb Ferdinand Runge discovered Phenol in the year 1834. It was extracted from coal tar.

Bromomethane, commonly known as methyl bromide, is an organobromine compound with formula CH3Br. It is a colorless, odorless, nonflammable gas which is produced both industrially and biologically.  It consist of a  a tetrahedral shape and is  recognized as a ozone-depleting chemical.

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Ice water used to cool the distillate in the E1 experiment because the distillate is volatile in nature and present in vapour form.

Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.

Unsaturated compounds are produced during elimination processes. An alkene is created during the removal of alcohol. Alkyl halides also go through elimination processes. We will do an acid-catalyzed elimination using a secondary alcohol that is second order (E1), meaning that the rate of reaction depends on how quickly the intermediate carbocation may be produced.

Ice water helps in condensing or cooling down the vapours coming to the condensing tube (i.e. distillate).

Because the resulting alkene has a low boiling point, the receiver flask is put in an ice water bath to keep it cool throughout the reaction and distillation.

Hence, Ice water used to cool the distillate in the E1 experiment because the distillate is volatile in nature and present in vapour form.

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