What byproduct of fermentation creates the characteristic holes in swiss cheese? select one:
a. carbon dioxide
b. lactic acid
c. ethyl alcohol
d. acetic acid

Color. A substance's changing color does not always mean that something has changed chemically. For instance, altering a metal's color does not alter its physical characteristics.

A substance's shape is a physical attribute, and any modification of a physical property cannot be interpreted as a sign of a chemical modification.

In essence, a physical change does not result in the creation of a new material, whereas a chemical change does.

While undergoing a physical change, a material may change shape or form, but no chemical processes take place, and no new compounds are created.

Therefore, a change in color is not a sign of a chemical reaction.

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Chromium(Cr)53 has 24 protons, 24 electrons and 29 neutrons. Ruthenium(Ru)103 has 44 protons, 44 electrons and 59 neutrons.

In any atom, the atomic number, usually denoted with the letter Z, is always equal to the number of protons. For instance, if an atom has the atomic number 10, it will also have 10 protons. In a neutral atom, the number of protons is equal to the number of electrons. To get the number of neutrons, we subtract the number of protons from the atomic mass. The atomic mass or mass number is the addition of the number of protons and neutrons.

In the question, we are only given the atomic mass - 53. To know the number of protons, we need to get the atomic number. On the periodic table, Chromium (Cr) is element number 24 (which is the atomic number) hence, it also has 24 protons. Since the atom is neutral, it will also have 24 electrons. To get the number of neutrons, we subtract 24 from 53, which will give us 29 neutrons.

Ruthenium (Ru) has the atomic number 44, showing that it has 44 protons. It is also a neutral element, so it will also have 44 electrons. The atomic mass we are given in the question is 103. Therefore, to get the number of neutrons, we subtract 44 from 103, which will give us 59 neutrons.

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"Energy can be neither created nor destroyed but can only be converted from one form to another" In the above case liquid is converted to gas keeping the mass of the molecules the same.  The energy lost while evaporating is conserved.

The water evaporates into water vapor, where the total water molecules remain the same, the molecules are just spread out over a greater volume but the mass remains the same.

Evaporation occurs when a molecule gains or loses energy, and it exists in the form of heat. This is how the energy is conserved during evaporation.

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The most abundant isotope of iridium is Iriduium-192.

An element is composed of isotopes. The isotopes of an elements have different mass numbers but the same atomic number. These difference in the mass number is caused by differences in the number of neutrons.

Hence, we can see that all elements do have isotopes. The chemical and physical properties of isotopes may be the same save that the rate of reaction of the individual isotopes may slightly differ. The most abundant isotope has the highest length in the mass spectrum.

We can see that there are three isotopes of Iridium that are common. The most abundant isotope of iridium is Iriduium-192.

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Answer:

Helium

Explanation:

Noble gases are exceedingly stable and unlikely to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of these atoms.

Any one of the seven chemical elements that compose Group 18 (VIIa) of the periodic table is referred to as a noble gas. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson are the constituent elements (Og). The noble gases are inflammable, tasteless, colorless, and odorless. The term "noble" has long been used in science and alchemy to describe how resistant metals like gold and platinum are to chemical reactions. As their atomic numbers rise, the abundances of the noble gases fall.

German chemist Friedrich E. Dorn discovered radon for the first time in 1900, and in 1904 it was recognized as a member of the noble-gas family. In 1904, the work of Rayleigh and Ramsay was recognized with Nobel Prizes.

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Answer:

a. highest point

The pressure of an ideal gas is directly proportional to its absolute temperature.

The pressure of an ideal gas  is directly proportional to absolute temperature at constant volume.The volume of a gas is also directly proportional to it's absolute temperature at constant pressure.

When a constant volume of gas is held, the pressure of gas increases as the temperature increases. Mathematically it can be expressed as:

                                P∞T

In order to remove proportionality sign an equal sign is introduced with a proportionality constant 'K',thus the equation becomes

                                P=KT

On dividing both sides of above equation by T , equation becomes

                                 P/T=K

When a plot of pressure versus temperature is plotted a straight line graph is obtained passing through the origin.

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The iupac name for the following compound is 3,5-dimethylheptanedioic acid

The worldwide organization that represents chemistry and allied disciplines and technology is called the International Union of Pure and Applied Chemistry (IUPAC).

The International Union of Pure and Applied Chemistry (IUPAC) is the foremost expert on chemical language and nomenclature, including the naming of new elements in the periodic table, standardized measurement techniques, atomic weights, and a wide range of other critically analyzed data.

A global standard for naming chemicals is to be established through the IUPAC system of nomenclature in order to improve communication. The system's objective is to assign each structure a distinct and clear name and to associate each name with a distinct and clear structure.

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Electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity while free electrons can conduct electricity.

The valence electrons can be defined as those having a negative charge that are linked to atomic particles, while the free electrons do not form atomic particles in the sense they are unbound to atomic particles.

In conclusion, electrical conductivity can be used to determine the bond type because there are valence electrons that are not able to conduct electricity and while free electrons can conduct electricity.

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answer:

a. true

explanation:

carbon is found in all organic compounds; it's the main compound. it's essential to life and without it earth would be nonexistent.

The process of diluting 1.2 m nh4cl solution to prepare 1.4 l of a 0.25 m nh4cl solution. To determine if each of the follow statement is true or false.

The assertion is true.

What is dilution?

By incorporating more solvent, dilution refers to the process of lowering a solute's concentration in a solution. We increase the solvent without increasing the solute in a solution to dilute it. After that, we vigorously mix the resulting solution to make sure that it is evenly distributed throughout.

The assertion is true.

(1) The equation for dilution

A balance of moles of the solute, in this case NH4Cl, is expressed as M1V1 = M2V2.

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In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.

V1 and V2 are, respectively, the volumes of solutions 1 and 2.

We obtain - mg/mL by substituting the given values.

The final concentration of the solution is 0.11 g/ml.

What is a solution?

A solution is a uniform mixture of two or more components with particles smaller than one nanometer. There are many different types of solutions, such as soda water, salt-and-sugar solutions, and others. In a solution, each component appears as a separate phase.There is particle homogeneity, or a uniform distribution of the particles. This explains why a soft drink bottle's entire contents have the same flavour.

In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

Knowing that C1V1 = C2V2 means that C1 and C2 are the concentrations of solutions 1 and 2, respectively.

V1 and V2 are, respectively, the volumes of solutions 1 and 2.

We obtain - mg/mL by substituting the given values.

In terms of grammes per millilitre, the final Randyne concentration was 0.011 g/mL.

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1.64 hours will be taken to plate out 8.90g of nickel.

Nickel (Ni), is a chemical element and Group 10 ferromagnetic metal with high resistance to oxidation and corrosion. Although nickel is more important either as a pure metal or in the form of alloys for its various home and industrial applications, it is also known for being silvery white, robust, and tougher than iron.

Iron and the element nickel extremely seldom co-occur in terrestrial and meteoric deposits. Baron Axel Fredrik Cronstedt, a Swedish chemist and mineralogist, separated the metal in 1751 after preparing an impure sample from an ore containing niccolite. Earlier, a similar ore of this kind was given the nickname Kupfernickel in honor of "Old Nick" and his naughty gnomes because, while looking like copper ore, it produced a brittle, foreign metal.

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The most abundant isotope here is 259Q.

We know that isotopes refers to those atoms of elements that have the same atomic number but different mass numbers. The reason for the difference in the mass number is because they do not have the same number of neutrons. Recall that the mass number is the sum of the number of protons and neutrons in the nucleus of an atom.

The existence of isotopy is the reason why the relative atomic masses of elements are not whole numbers.

Note that the isotopes are not abundant to the same extent. The isotopes that are are more abundant tend to affect the value of the relative atomic mass. The relative atomic mass is nearest in value to the mass of the most abundant individual isotope.

As such, the most abundant isotope here is 259Q.

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The statement which best describes the difference between dissolution and melting is that dissolution involves the formation of a new substance, while melting involves a state change and is denoted as option A.

This is the process in which a solute dissolves in a solvent such as water to form a solution thereby resulting in a new substance being created.

Melting on the other hand is the process in which a solid phase is changed into a liquid phase with the application of heat which makes the atoms move more freely.

This is therefore the reason why option A was chosen as the most appropriate choice.

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it can change everything

The key factors  that determine the stability of a nucleus are neutron /proton ratio and  total number of nucleons in the nucleus.

Nuclear stability is determined by neutron/proton ratio and the total number of nucleons.Stable nuclei with atomic numbers up to 20 have neutron/proton ratio  of about 1/1.

For elements above atomic number 20 the number of neutrons is always greater than the number of protons which are  present along with neutrons in the nucleus of an atom.Such atoms are called stable isotopes.

No nucleus having number of nucleons greater than 208 is stable. This arises due to the fact when the nuclear force becomes 100 times , it operates only on very short distances .

When the nucleus attains a certain size,the strong force of attraction is no longer capable of holding the nucleus together.

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Answer: It has a lower boiling/melting point than the water

Phosphoric acid has emerged as a novel chiral Brønsted acid catalyst since 2004. Chiral Brønsted acid protonates imines, thereby forming iminium salt bearing a chiral counter anion, and directs the attack of the nucleophile to the iminium salt.

With the chemical formula H3PO4, phosphoric acid, also known as orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid, is an inorganic solid that contains phosphorus. Colorless and odorless, phosphoric acid is a substance. In its most common form, an 85% aqueous solution, it appears as a syrupy liquid that is colorless, odorless, and non-volatile. Considering that many fertilizers include it, it is a significant industrial chemical.

Acid makes up the substance. The phosphate ion PO results from the removal of all three H+ ions. H2PO, or hydrogen phosphate, is produced when one or two protons are removed, correspondingly. Organophosphate esters are produced by phosphoric acid.

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There are three primary ways that the animal cell membrane keeps things in balance: enabling the membrane to flow fluidly, controlling the process by which water moves from a high concentration to a low concentration, and maintaining particular ion concentrations.

Negative feedback loops keep homeostasis in check. Positive feedback loops may be necessary for life to exist even when they actually push the organism further away from homeostasis. The neural and endocrine systems of mammals regulate homeostasis.

For instance, an animal must use the thermoregulation mechanism to control body temperature. Cold-adapted organisms, like the polar bear, have physical characteristics that enable them to survive extreme cold and retain body heat. Fur, feathers, blubber, and fat have structures that help with this kind of insulation.

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Answer:

Boiling Water

Explanation:

Boiling water is a physical change because the gaseous water produced is chemically identical to the liquid water i.e both of them have the same molecular structure of the water

The major organic compound is 2,2-dibromoheptane.

Any of a vast group of chemical compounds known as organic compounds contain one or more carbon atoms that are covalently connected to atoms of other elements, most frequently hydrogen, oxygen, or nitrogen. Carbides, carbonates, and cyanides are among the few carbon-containing substances that aren't categorized as organic.

Organic compounds make up about one-third of all industrially manufactured substances. Organic compounds make up the majority of foods, medications, clothing fibers, and plastics, as well as all living things. Many different fields can benefit from the identification of organic molecules. Scientists have just created a new technique dubbed "material degradomics" to track the deterioration of antiquated books and historical artifacts. Paper develops the well-known "old book smell" when it ages due to the emission of organic chemicals in gaseous form.

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The following are the results of the unit conversions as shown in the question;

1) 43900 Pa

2)  71.3 Pa

3)  5.36 * 10^-3 L

4) 0.586 g

5) 9.37 * 10^-7 L

We know that conversion from one unit to another is performed by the use of conversion factor. We know that we could carry out these conversions from one unit to another in order to improve the ease at which we are able to perform a calculation.

We know that dimensions are very important when we are trying to effect the conversion. Let us now try to effect each of the conversions as shown;

1) 4390000 * 1 Pa/100c Pa = 43900 Pa

2) 0.0713 kPa * 1000 Pa/1 KPa = 71.3 Pa

3) 53.6 dL * 1 L/10000 dL = 5.36 * 10^-3 L

4) 586 mg * 1 g/1 * 10^3 = 0.586 g

5) 0.937 μL * 1 L/1 * 10^6  μL = 9.37 * 10^-7 L

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The angle between sulfur-bromine bonds in SBr6 is 90°.

Sulfur hexabromide(SBr6), is a chemical compound with the hybridization of one s orbital, three p orbitals, and two d orbitals.

Hence, the hybridization of the central atom i.e, Sulfur in this compound is sp3d2.

As the compound has a hybridization of sp3d2, its shape is octahedral, as shown in the adjoining image.

As it is visible from the structure of SBr6, all angles between Sulfur and bromine are equal and their value is 90°.

Thus, the angle between sulfur-bromine bonds in SBr6 is 90°.

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Hence , the molecular formula for azt is C₁₀H₁₃N₅o₄ which is option (d) .

The molecular formula for azt is C₁₀H₁₃N₅o₄

In this formula, there area unit 10 carbon atoms and 13 H atoms and 5 nitrogen atoms and 4 oxygen atoms within the given compound.

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A substance that is not in its standard state is option(b) i.e, H.

The standard state of a substance occurring at the specified temperature and one atmosphere of pressure is the typical condition of a substance occurring in a condensed phase.

Eleven elements are gases in their standard state. Including all noble gases and the halogens fluorine and chlorine (He, Ne, Ar, Kr, Xe, Rn). Hydrogen (H), oxygen, and nitrogen make up the remaining three. All other elements are solid in their native state.

The concept of standard state conditions stipulates that liquids and gases must be pure, solutions must be at 1 M concentration, and 1 atm of pressure is used in STP calculations involving gases that resemble ideal gases. Although the temperature is not stated, most tables gather information at 25 degrees C. (298 K).

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Widely separated, moving at random describes the molecules in very dilute sugar solution at room temperature.

This is attributable to the fact that sugar is soluble in liquid water under all conditions of pressure and temperature. From about 180g of sugar in 100ml of water at 0 degrees to about 490g in 100ml of water at 100 degrees, the solubility of sugar does increase with temperature. As the saturated concentration rises, the solution will become unsaturated. Temperature increases the solubility.

In general, sugar dissolves more readily at higher temperatures than it does at lower ones. Because the molecules in hot water (or coffee) move more quickly and are spaced farther apart, the sugar can mix with them more easily. In fact, sugar is very soluble; it just isn't at lower temperatures.

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A 100 gram gold nugget contains 5 grams of gold.

Then Percentage of gold in the gold nugget is

(5/100)*100 =5%.

A % in mathematics is a quantity or ratio that is stated as a fraction of 100 (from the Latin per centum, "by a hundred"). Although the abbreviations "pct.", "pct.", and occasionally "pc" are also used, the percent symbol, "%," is frequently used to indicate it. A % lacks dimensions and has no associated unit of measurement.

If there are 50 male pupils for every 100 overall students in the class, 50 of them will be male. There are 250 male students out of 500 total.

Long before the decimal system was developed, computations were frequently done using fractions that were multiples of one hundred.

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