A student claims that a large percentage of water on Earth is immediately available to drink. Is he correct? Why or why not?

Answer: A new substance forms when the batter is cooked.

Making pancake from batter is an example of chemical change because, a new substance forms when the batter is cooked. The formation of a new product indicates a chemical change. Hence, option C is correct.

A chemical change involves the breaking or making of chemical bonds. The chemical bonds of the reactants breaks and the new bonds are created by intergrouping the atoms to form a new product which have different properties than the initial substances.

The physical changes does not include any change in chemical bonds. Phase changes, change in shape, size etc . are physical changes. They does not involve any formation of new products or color change.

Here, the pancake forms from the batter by the formation of new bonds and product. Where the initial substances are consumed. Therefore, option B is correct.

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The enzyme that catalyzes the reaction 2H₂O₂ → 2H₂O + O₂ is (A) catalase.

Catalase is a common enzyme found in many living organisms, including humans. It plays a crucial role in protecting cells from the harmful effects of hydrogen peroxide (H₂O₂), which is a byproduct of various metabolic processes.

The reaction catalyzed by catalase involves the breakdown of hydrogen peroxide into water (H₂O) and molecular oxygen (O₂). This reaction is important because hydrogen peroxide can be toxic to cells if it accumulates in high concentrations.

By rapidly converting hydrogen peroxide into water and oxygen, catalase helps maintain cellular homeostasis and protects cells from oxidative damage.

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Answer:

6.25m/s

Explanation:

speed = distance/time

speed = 100/16 = 6.25m/s

The standard free energy change (∆Gº') is the energy released when the products are created from the reactants. The (∆Gº') at 298 K is -5.40kJ.

The standard free energy change is given by the sum of the standard free energies of the products subtracted from the sum of the standard free energies of the reactants, given as,

ΔG = ∑nΔG°products − ∑mΔG°reactants

Given,

ΔG°(NO₂) = 51.84 kJ/mol

ΔG°(N₂O₄) = 98.28 kJ/mol

Substituting values:

ΔG = ∑nΔG°products − ∑mΔG°reactants

= ΔG°(N₂O₄) − 2ΔG°(NO₂)

= 98.28 − 2(51.84)

= - 5.4

Therefore, -5.40 kJ is the standard free energy.

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Answer:he’s right

Explanation:

Lithium nitride is the only alkali metal nitride which has the chemical formula Li₃N and it reacts with water to produce ammonia and lithium hydroxide. The charges of each ion are +1 and -3. The correct option is B.

The ions which are positively charged are called the cations whereas the ions which are negatively charged are called the anions. The combination of the cations and anions results in the formation of an ionic compound.

In lithium nitride, the cation is Li⁺ and the anion is N³⁻. The charge on the nitride ion is -3 and that of the lithium ion is +1. The total number of electrons present in the molecule is 10. Because the number of protons is 7 and 3 electrons were added from -3 on the nitride ion.

Thus the correct option is B.

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Sodium fluoride (NaF) would NOT form a precipitate when added to a solution of silver nitrate.

When an aqueous solution is mixed with silver nitrate, a precipitate will form if the anion can form an insoluble compound with silver ions. In this case, NaCl, NaBr, and NaI form insoluble silver halides (AgCl, AgBr, AgI) which precipitate.

However, NaF does not form an insoluble compound with silver ions. Silver fluoride (AgF) is soluble in water, so when NaF is added to a silver nitrate solution, no precipitate forms. The solubility of silver fluoride is due to the high solvation energy of fluoride ions, which overcomes the lattice energy of the solid AgF compound.

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Answer:  It is not accurate to claim that the "mystery" of who had built the mounds in the American Midwest and Southeast has been completely solved to the satisfaction of virtually all scientists.

Explanation:

While there has been extensive research and progress made in understanding these ancient mounds, there are still debates and ongoing investigations surrounding their origins and the cultures responsible for their construction.

The mounds, such as those found at Cahokia in Illinois or the various mound sites in Ohio, were built by indigenous peoples of North America. However, determining specific details about the builders, their identities, and the reasons behind mound construction can be challenging due to limited historical records and the passage of time.

Archaeologists and anthropologists have used various methods, including radiocarbon dating, artifact analysis, and excavation techniques, to study these sites. They have identified different mound-building cultures such as the Adena, Hopewell, and Mississippian cultures. Still, there are unanswered questions and ongoing research to refine our understanding of these ancient civilizations and their mound-building practices.

While progress has been made in unraveling the mysteries surrounding the mound builders of the American Midwest and Southeast, it would be inaccurate to claim that the matter has been definitively resolved and satisfies all scientists. Research and exploration in this field continue to shed light on these fascinating ancient cultures and their monumental constructions.

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Answer:

6.023×10^23

Explanation:

as 1 atom of carbon molecules is equal to the Avogadro's number.i.e. 6.023×10^23

Answer:

C. Trigonal pyramidal

Explanation:

According to the valence shell electron pair repulsion theory, the shape of ammonia is trigonal pyramidal in nature.

The bond angle is 107° and it has bond pair of 3 and lone pair of 1.

A tetrahedral is exhibited by methane

Trigonal planar is exhibited by BF₃

Chlorine gas has the the chemical formula \(Cl_{2}\) ,Solid phosphorus has the chemical formula \(P_{4}\) ,Phosphorous pentachloride has the chemical formula \(PCl_{5}\), The final balanced equation is \(P_{4}\)  + 10 \(Cl_{2}\)   ...........> 4 \(PCl_{5}\),

distorted vision blisters, redness, and burning sensation on the skin after exposure to gas. If skin is subjected to liquid chlorine, it may suffer injuries resembling frostbite. feeling of burning in the eyes, throat, and nose.

The taste and smell of chlorine gas are both disagreeable. In concentrations as low as 1 part of every million, it can be detected (ppm). As an oxidizing agent, chlorine corrodes the metals used in plumbing and kitchen appliances. Equipment gaskets might become brittle due to corrosion from chlorine.

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Answer:

he introduced triads of similar chemical properties in periodic table.

Explanation:

The partial pressure of N₂ is 3.75 atm, the partial pressure of O₂ is 2.50 atm, and the partial pressure of CO₂ is 1.25 atm in the given mixture at 25 °C and a total pressure of 10.0 atm.

To calculate the partial pressure of each gas in the mixture, we can use the concept of Dalton's law of partial pressures. According to this law, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each individual gas.

First, we need to find the mole fraction of each gas in the mixture. The mole fraction of a gas is the ratio of the number of moles of that gas to the total number of moles in the mixture. We can calculate the mole fraction using the following formula:

Mole fraction (X) = Moles of gas / Total moles of all gases

For N₂:

Mole fraction of N₂ (X_N₂) = 3.00 mol / (3.00 mol + 2.00 mol + 1.00 mol) = 0.375

For O₂:

Mole fraction of O₂ (X_O₂) = 2.00 mol / (3.00 mol + 2.00 mol + 1.00 mol) = 0.250

For CO₂:

Mole fraction of CO₂ (X_CO₂) = 1.00 mol / (3.00 mol + 2.00 mol + 1.00 mol) = 0.125

Next, we can use the mole fractions to calculate the partial pressures of each gas. The partial pressure of a gas is equal to the mole fraction of that gas multiplied by the total pressure of the mixture.

Partial pressure of N₂ (P_N₂) = X_N₂ * Total pressure = 0.375 * 10.0 atm = 3.75 atm

Partial pressure of O₂ (P_O₂) = X_O₂ * Total pressure = 0.250 * 10.0 atm = 2.50 atm

Partial pressure of CO₂ (P_CO₂) = X_CO₂ * Total pressure = 0.125 * 10.0 atm = 1.25 atm

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Answer:

I would say the top one but im not confident in the answer

The net ionic equation for the reaction between agno3aq and na2so4aq would be 2Ag+(aq)  + SO4^2-(aq) → Ag2SO4(s)

The net ionic equation shows the chemical species involve in the chemical reaction while the complete ionic equation also involves the spectator ions. The net ionic equation state whether precipitation occurs or not. If the chemical reaction has no net ionic equation it means all are aqueous from no precipitation occurring.

AgNO3 → Ag+ + NO3-

Na2SO4 → 2Na+ + SO4^2-

2AgNO3(aq) + Na2SO4(aq) → 2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq)

2Ag+(aq) + 2NO3-(aq) + 2Na+(aq) +SO4^2-(aq) → Ag2SO4(s) + 2NaNO3(aq)

2AgNO3(aq) + Na2SO4(aq) → Ag2SO4(s) + 2NaNO3(aq)

We cancel the spectator ions  (NO3^-  and Na^+)

the net ionic equation with states of matter is:

2Ag+(aq)  + SO4^2-(aq) → Ag2SO4(s)

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Answer:

C. A combustion reaction.

Explanation:

Let's see why a combustion reaction would be the answer:

A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O2 as one reactant.

When a combustion reaction has a hydrocarbon as a reactant (a compound made up solely of carbon and hydrogen), the products of the combustion of hydrocarbons would be carbon dioxide and water. Many hydrocarbons are used as fuel because their combustion releases very large amounts of heat energy.

Based on this logic, the answer would be C. A combustion reaction.

The given statement "a phospholipid molecule has a polar and a nonpolar end" is True. A phospholipid molecule consists of a polar head and a nonpolar tail, which gives it amphipathic properties.

The polar end of the phospholipid is hydrophilic, meaning it has an affinity for water molecules. This polar head contains a phosphate group and is attracted to the aqueous environment.

On the other hand, the nonpolar end of the phospholipid is hydrophobic and repels water. This nonpolar tail is composed of fatty acid chains, which lack charged or polar groups.

The combination of the polar head and nonpolar tail allows phospholipids to form the fundamental structure of cell membranes, with the polar heads facing outward towards the aqueous environment and the nonpolar tails aligning in the interior, creating a barrier that separates the cell from its surroundings.

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Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Hope this helps

Answer:

Light as a wave: Light can be described (modeled) as an electromagnetic wave. In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. ... So, Maxwell's equations do say that light is a wave.

Explanation:

Credit for 2021FOLLOWme

the nurse will administer approximately 1 teaspoon (tsp) of the medication.1 teaspoon (tsp) is approximately equal to 5 mL.

To determine the number of teaspoons the nurse should administer, we need to calculate the equivalent volume of 30 mEq of KCL using the provided concentration of 60 mEq/10 mL.

First, we'll find the ratio of milliequivalents (mEq) to milliliters (mL) in the given concentration:

60 mEq / 10 mL = 6 mEq/mL

Next, we can set up a proportion to find the volume (in mL) that corresponds to 30 mEq:

6 mEq/mL = 30 mEq / X mL

To solve for X, we can cross-multiply:

6X = 30 * 1

6X = 30

X = 30 / 6

X = 5 mL

Since the medication cup is marked in teaspoons, we need to convert 5 mL to teaspoons.

1 teaspoon (tsp) is approximately equal to 5 mL.

Therefore, the nurse will administer approximately 1 teaspoon (tsp) of the medication.

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Answer:

595 g will produce 5 mol of KBr

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 5 moles are there in  595 grams KBr.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the formula for number of mole can be given as

number of mole of KBr =given mass of KBr ÷ molar mass of KBr

Molar mass of 1 mole of KBr=  119 g/mol

mass of KBr=  595 grams

substituting all the given values in the above equation, we get

number of mole of KBr= 595  ÷  119

On calculation, we get

number of mole of KBr = 5 moles

Therefore, 5 moles are there in  595 grams KBr.

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Mass is the answer because when i measure i do it with the matter of mass

The solution that will not form a precipitate when added to 10 mL of 0.10 M KOH is 10 mL of 0.10 M AgCH3CO2.

Option D is correct.

A precipitate is an insoluble solid that emerges from a reaction between two aqueous solutions. When the two solutions are mixed, the precipitate settles out of the solution. To determine whether a precipitate will form in a chemical reaction, it is essential to know whether the resulting compound is soluble in water or not.

AgCH3CO2 will not form a precipitate when added to 10 mL of 0.10 M KOH because it is a soluble salt. KOH, on the other hand, is a strong base, and when it dissociates in water, it releases OH- ions. These ions combine with Ag+ ions in AgCH3CO2 to produce AgOH, which is a brown precipitate that does not dissolve in water.

However, in this case, the concentration of KOH is not sufficient to produce the precipitate.

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Answer:

Neutron pull together Neutron

Answer:

Because matter cannot be destroyed or created, It can change form through physical, chemical changes but the matter never gets destroyed or created.

Explanation:

The idea of the atomic nature of matter was first developed by John Dalton.

He introduced the atomic theory, which proposed that matter was made up of tiny, indivisible particles called atoms. This theory was based on his observations and experiments on the behavior of gases

.Dalton's atomic theory had several postulates that helped explain the properties of matter. These postulates were:

All matter is made up of atoms, which are tiny, indivisible particles

.Each element is composed of atoms that are identical in size, shape, and chemical properties.

Atoms of different elements have different sizes, shapes, and chemical properties.

Atoms combine in fixed ratios to form compounds, and the ratios of their masses are related by whole numbers.

Atoms are indestructible and cannot be created or destroyed in chemical reactions

.However, Dalton's atomic theory was later modified and expanded upon by other scientists, including J.J. Thomson, Ernest Rutherford, and Niels Bohr, as new discoveries about the structure and behavior of atoms were made.

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Answer:

1:1

Explanation:

Since that is it's half life.

Answer:

Heat is absorbed.

Explanation:

Endothermic reactions: Heat is absorbed.

When there is a change in the endothermic chemical so here heat is absorbed.

It is the type of the chemical reaction that absorbed the heat from the environment. The absorbed energy that gives the activation energy for the reaction to arise.

hence, When there is a change in the endothermic chemical so here heat is absorbed.

Therefore, the first option is correct.

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Henry's law, a gas law in physical chemistry, asserts that the quantity of dissolved gas in a liquid is inversely proportional to the partial pressure of the gas above the liquid. Henry's law constant is the name of the proportionality constant.

William Henry, an English chemist, developed Henry's law around the beginning of the 19th century. It claims that the relationship between dissolved gas concentration and gas phase partial pressure is linear. The Henry's law constant is the name of the proportionality factor.

Kн K1 is equal to 1.25 x 10-3 mol dm-3 atm-2.

KH times Pgas equals soluble.

Solvability = 1.25 x 10-3 x 2.5

Solubility is equal to 3.125* 10-3 mol/dm2.

The Henry's law constant (KH), commonly known as the air-water partition coefficient, is the ratio of a compound's concentration in water to its partial pressure in the air at a given temperature.

For example, moles per cubic meter for water and atmospheres for air (atm-m3/mol), or in a dimensionless unit like KH′ = KH/(RT), where KH′ is the dimensionless unit Henry's law constant (atm-m3/mol), ideal gas constant (8.20575 105 atm-m3/mol-K), and water temperature (K).

When a compound's molecular weight is less than 200 grammes per mole and its Henry's law constant is more than 103 atm-m3/mol, it is often classified as volatile.

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