At standard pressure, which substance becomes less soluble in water as temperature increases from 10. °c to 80. °c?.

Answer: the answer for this question is in the pic

Explanation:

The dissociation of calcium nitrate in aqueous media leads to the formation of calcium ions and nitrate ions, which play significant roles in various chemical and biological processes.

In aqueous media, calcium nitrate (Ca(NO3)2) dissociates into ions through a process known as ionization or dissociation. The correct equation that represents this dissociation is:

Ca(NO3)2 → Ca^2+ + 2NO3^-

In this equation, the solid calcium nitrate (Ca(NO3)2) breaks apart in water to form calcium ions (Ca^2+) and two nitrate ions (2NO3^-). The (aq) notation represents the aqueous state of the ions, indicating their presence in a water solution.

The dissociation of calcium nitrate occurs because water molecules surround the ions and exert electrostatic forces, causing the compound to separate into its constituent ions. Calcium cations (Ca^2+) are formed when water molecules interact with calcium atoms, attracting away two valence electrons. Nitrate anions (NO3^-) result from the interaction between water molecules and the nitrate group.

It's important to note that the dissociation of calcium nitrate is complete in aqueous solutions, meaning that all molecules of calcium nitrate separate into individual ions. This complete dissociation is due to the high solubility of calcium nitrate in water.

The resulting calcium ions and nitrate ions are then free to participate in various chemical reactions or interact with other ions present in the solution. Calcium ions are involved in processes such as precipitation, complexation, and biological functions, while nitrate ions are essential for plant nutrition and can partake in redox reactions.

Overall, the dissociation of calcium nitrate in aqueous media leads to the formation of calcium ions and nitrate ions, which play significant roles in various chemical and biological processes.

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The given statement " William Aston created the mass spectrograph to analyze and separated them, found 218 and found mass and percent abundance of each atoms" is false.

The mass spectrograph was not invented by William Aston. It was actually invented by J.J. Thomson in the early 20th century.

J.J. Thomson's work with the mass spectrograph led to the discovery of isotopes, which are different forms of an element with the same number of protons but different numbers of neutrons. Isotopes have different masses, and the mass spectrograph allowed scientists to separate and analyze them based on their mass-to-charge ratio.

The process of using a mass spectrograph to determine the mass and percent abundance of isotopes is known as mass spectrometry. It involves ionizing a sample, separating the ions based on their mass-to-charge ratio, and detecting the ions to determine their abundance.

The completed question is given as,

State true or false

William Aston created the mass spectrograph to analyze and separated them, found 218 and found mass and percent abundance of each atoms.

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Answer:

The increased electron density along the internuclear axis is called a n bond. a. True b. False

B. False

Explanation:

Fe serves as the limiting reagent since there are less moles of it than there are of S. As a result, when 9.42 g of Fe and 8.50 g of S react, 14.8 g of FeS is produced.

Fe + S = FeS is the equation for the reaction that creates iron sulphide (heat) Page 2 Geological Survey of Maine | 2 One molecule of iron sulphide is created when one iron atom (or one million iron atoms) reacts with one sulphur atom (or one million sulphur atoms) in the presence of heat (or a million molecules of iron sulfide).

As you can see from the processes listed above, Fe is going through an oxidation process in which it loses electrons.

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A.  Temperature leads to weathering of rocks as rocks expand and contract when they are heated and cooled which causes them to break; option B is correct.

B. The part of the Earth that experiences physical weathering is the crust; option D is correct.

C. The last stage of physical weathering in rocks is sand; option A is correct

D. A crack must be present on a rock that undergoes frost wedging; option B is correct.

Physical weathering is a form of rock weathering in which large rocks are broken down into smaller rock particles without a change occurring in the chemical composition of the rocks.

Agents of physical weathering include wind, water, ice, and heat.

Some forms of physical weathering include:

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Answer:

B). The rocks are being chemically weathered by the water.

Explanation:

Because the water is slowly destroying the rock

Answer:

C. 65.5 g PF3 x (1 mole / 87.97 g PF3)

Explanation:

Dimensional analysis can be used to find the amount of moles in 65.5 grams of PF3 gas.

First we would need to determine relevant conversions.

We would need to find the molar mass of PF3 which is already given ( 87.97 g / mol )

So 1 mole of PF3 = 87.97g

From there we can create the dimensional analysis table which will look something like the attached image.

This table correspond with answer choice C.

Reasons it's not the other answer choices.

It wouldn't be A because the units must cancel out and they don't as grams is being multiplied by grams

It would be B because it doesn't use correct units.

There are not 87.97 moles in 1 gram of PF3. There are 87.97 grams in 1 mole of PF3

Answer:

I believe its an NH4^+ ion & an NO3^- ion

Explanation:

hope this helps!

Answer:

78.96 grams

Explanation:

I looked it up and that's what I found

hope it helps

Answer:

78.96 g mol

Explanation:

78.96 g mol

in the period table the mass of Se is 78.96 g mol

Answer:

Elizabeth Madden. Palomino.  2-3 years old. Horses can sleep both lying down and standing up.  Horses can run shortly after birth.  Domestic horses have a lifespan of around 25 years. Ride a bike.

Explanation:

Bases interact through hydrogen bonds to form a double strand of DNA from two single strands of DNA.

On the two opposing strands of the DNA double helix are molecules called nucleotides that interact chemically. The two strands of DNA are held together by these chemical bonds, which function like rungs on a ladder. DNA contains the bases adenine (A), cytosine (C), guanine (G), and thymine (T) (T).

Adenine forms chemical bonds with thymine while cytosine forms chemical bonds with guanine to join the two strands together.

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The Pauli exclusion principle explains the periodic table by stating that no two electrons in an atom can have the same set of quantum numbers.

In more detail, the periodic table organizes elements based on their atomic number, which represents the number of protons in an atom's nucleus. Each element consists of a unique arrangement of electrons around the nucleus. The Pauli exclusion principle, formulated by Wolfgang Pauli, states that within an atom, no two electrons can have the same set of quantum numbers.

Quantum numbers describe various properties of electrons, such as their energy, orbital shape, and orientation. According to the principle, each electron must have a distinct combination of quantum numbers, including the principal quantum number (n), the azimuthal quantum number (l), the magnetic quantum number (m), and the spin quantum number (s). This means that in a given atom, electrons occupy different energy levels and subshells, contributing to the observed patterns in the periodic table. The principle helps explain the filling order of atomic orbitals and the organization of elements into periods and groups based on their electronic configurations. It also plays a crucial role in understanding chemical bonding and the properties of elements.

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The formulation of synthetic wigs is based on synthetic fibers

Synthetic wigs are typically made from materials such as acrylic, polyester, or a blend of different synthetic fibers. These fibers are designed to mimic the look and feel of natural hair, while also being durable, lightweight, and easy to maintain.

The synthetic fibers used in wig production are often heat-resistant, allowing for some styling versatility with low-heat settings. However, it's important to note that excessive heat can damage synthetic wigs, so it's recommended to follow the manufacturer's instructions for styling and maintenance.    

Compared to natural human hair wigs, synthetic wigs are generally more affordable and require less maintenance. They also tend to hold their style well and are often pre-styled, meaning they maintain their shape and structure even after washing. Synthetic wigs are available in a wide range of colors, styles, and textures, providing options to suit different preferences and needs.

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The half-life of the radioactive substance is approximately 333.6 years. To find the half-life of a radioactive substance, we need to know how long it takes for half of the substance to decay. In this case, after one year, 70% of the substance remains, which means that 30% of the substance has decayed.

To find the half-life, we can use the formula:
\(t_{1/2}\)= ㏑(2) / λ

where
\(t_{1/2}\) is the half-life,  ㏑(2) is the natural logarithm of 2 (approximately 0.693), and λ is the decay constant.

We know that after one year, the substance has decayed by 30%, so we can set up an equation:
0.7 = e^(-λ * 1)

Taking the natural logarithm of both sides, we get:
㏑(0.7) = -λ * 1

Solving for λ, we get:
λ = - ㏑(0.7)

Plugging this into the formula for the half-life, we get:

\(t_{1/2}\) = ㏑(2) / (- ㏑(0.7))

Simplifying, we get:

\(t_{1/2}\) = 333.6 years

Therefore, the half-life of the radioactive substance is approximately 333.6 years.

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Answer:

The correct answer is - D C2H4.

Explanation:

Saturated hydrocarbons are hydrocarbons with single covalent C-C bonds. They are known as alkanes. The general formula for these hydrocarbons is  CnH2n+2

Unsaturated hydrocarbons the hydrocarbons with double or triple covalent C-C bonds. They are known as alkenes and alkynes respectively. The general formula for these hydrocarbons is  CnH2n and CnHn-2

For the given options:

Option D: C2H4, is the simplest alkene with a double bond so it is an unsaturated hydrocarbon.

Considering only specific heat, Lead would be the most ideal for use in cookware.

The amount of heat needed to raise a substance's temperature by one degree Celsius in one gram is known as its specific heat. Typically, calories or joules per gram per degree Celsius are used as the units of specific heat.

Lead would be the material best suitable for use in cookware if only particular heat were taken into account.

Lead, however, is too hazardous and hefty in comparison to the other possibilities.

Aluminum or iron would create the best cookware, therefore these materials may be the best overall options.

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Answer:

its lead

Explanation:

insane ik

The value of the gas constant will be high due to the increase in gas pressure.

Solution:

According to Ideal Gas Law, PV=nRT

where, P = Gas pressure (in atmospheres),   V= Gas Volume (in Liters),  n = number of moles of gas sample T=  Gas Temperature (in Kelvins), R = Gas Constant.

\(\therefore R=\frac{(P\ast V)}{(n\ast T)}\) ....... (1)  

P = \(P_{atm}\) - \(P_{water vapor}\)

where = Atmospheric pressure\(P_{water vapor}\) = Partial pressure of water vapor.

If students forgot to include the vapor pressure of water in the calculation of gas constant then the magnitude of pressure due to gas(P) will be more because they are not substracting the Water vapor value from the \(P_{atm}\)to get the actual P value.

The value of the gas constant will be high due to the increase in gas pressure.

The ideal gas constant R can be found experimentally by determining the number of moles of gas occupying a given volume of measurement at a known pressure and temperature. This information is obtained in this laboratory by collecting the oxygen produced by the decomposition of potassium chlorate over water. The water level inside the tube should match the water level outside the tube.

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Explanation:

Given the amount of fluorine is ---- 1.25 mol.

What is the mass of given fluorine in grams?

Since

\(Number of moles =\frac{given mass of the substance}{its molecular mass}\)

To get the mass of the substance in grams, multiply the given number of moles with the molecular mass of the substance.

Hence, among the given options, the correct answer is the last option that is

Multiply the atomic mass of fluorine by 1.25.

Answer:

Multiply the atomic mass of fluorine by 1.25.

Explanation:

i got it right on the exam!! :)

No. of moles of gas is constant at combined gas law and pressure, temperature and volume is variable.

Gas laws tells about the behavior and characteristics of gas at different conditions.

According to this law at constant pressure, volume of the gas is directly proportional to the temperature of the gas, and it is represent as:

V ∝ T or V = kT, where k = gas constant.

According to this law pressure of the gas is directly proportional to the temperature of the gas, and it is represent as:

P ∝ T or P/T = k, where k = gas constant.

According to this law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas, and it is represent as:

P ∝ 1/V or PV = k, where k = gas constant.

Combined gas law is the combination of all three above laws at constant moles of gas and it is represented as:

PV/T = k.

Hence, pressure and temperature is variables at Gay Lussac's Law.

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Answer:

c

Explanation:

Relative measures of VO2 compare oxygen consumption to body weight (ml/kg/min), while absolute measures represent the total oxygen consumption (L/min) without accounting for body weight.

Difference between relative and absolute measures of VO2:

Relative measures of VO2 compare an individual's oxygen consumption to their body weight and are expressed as milliliters of oxygen per kilogram of body weight per minute (ml/kg/min).

This accounts for differences in body size and allows for comparisons between individuals of varying weights.

Absolute measures of VO2 represent the total amount of oxygen consumed by an individual during physical activity and are expressed as liters of oxygen per minute (L/min).

Absolute VO2 values are not adjusted for body weight and are often used when comparing the overall cardiovascular fitness or metabolic demands of different activities.

In summary, relative measures of VO2 normalize oxygen consumption based on body weight, while absolute measures represent the total oxygen consumption regardless of body weight.

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The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.

Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.

Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.

Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.

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it is asked to analyze data related to the carbohydrate molecules and their chemical potential energy. The molecules contain 100 units of chemical potential energy. The question is also asking to propose an account of these 100 units as a result of the chemical reaction.

Carbohydrates are macromolecules that contain carbon, hydrogen, and oxygen. They are important biological molecules as they serve as the primary source of energy for most living organisms. The process of breaking down carbohydrates in order to release their stored energy is called cellular respiration. The energy that is stored within carbohydrates is referred to as chemical potential energy. When carbohydrates undergo chemical reactions, this energy is released in the form of ATP, which is then used to power the various cellular processes that occur within living organisms.

For instance, the ATP that is produced during cellular respiration is used to drive muscle contraction, protein synthesis, and the transport of molecules across cell membranes.  In this case, the 100 units of chemical potential energy that are stored within the carbohydrate molecules are a result of the chemical reaction that occurred during the process of photosynthesis. During this process, energy from the sun is used to convert carbon dioxide and water into glucose and oxygen. This glucose is then stored within the plant as a carbohydrate molecule. When the plant requires energy, the stored glucose is broken down through cellular respiration, and the energy that is released is used to power cellular processes. Thus, the 100 units of chemical potential energy that are contained within the carbohydrate molecules are a result of the chemical reactions that occurred during the process of photosynthesis.

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The value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction.

The given values ∆E = −33 kJ/mol and Ea = 20 kJ/mol represent the activation energy and the change in energy, respectively, for a chemical reaction. The activation energy, Ea, is the minimum energy required for the reaction to occur, while the change in energy, ∆E, represents the difference between the energy of the reactants and the energy of the products.

The relationship between the activation energy, Ea, and the change in energy, ∆E, can be expressed using the equation: ∆E = Ea + Ea′ where Ea′ represents the energy released during the reaction. Since the change in energy and the activation energy are given, we can rearrange the equation to solve for Ea′: Ea′ = ∆E - Ea

Substituting the given values, we get: Ea′ = −33 kJ/mol - 20 kJ/mol = -53 kJ/mol. Therefore, the value of Ea′ is -53 kJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases energy as it proceeds. The magnitude of the value (-53 kJ/mol) indicates that the energy released during the reaction is significant.

In summary, the value of Ea′ is -53 kJ/mol, and it represents the energy released during the chemical reaction. This value can be calculated using the equation Ea′ = ∆E - Ea, where ∆E is the change in energy and Ea is the activation energy.

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The correct answer is NaF. When added to a saturated solution of PbF2 (s) (lead(II) fluoride), NaF (sodium fluoride) will cause additional PbF2 to dissolve.

This is because NaF can provide fluoride ions (F-) in the solution, which can react with the PbF2 solid through a common ion effect.

The dissolution of PbF2 can be represented by the following equilibrium:

PbF2 (s) ⇌ Pb2+ (aq) + 2F- (aq)

When NaF is added, the concentration of fluoride ions (F-) increases due to the dissociation of NaF:

NaF (s) → Na+ (aq) + F- (aq)

According to Le Chatelier's principle, the increase in the concentration of fluoride ions will shift the equilibrium to the right, promoting the dissolution of more PbF2. Therefore, NaF is the correct compound that will cause additional PbF2 to dissolve in the saturated solution.

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Answer:

HNO3

Explanation:

PbF2(s) ⇌ Pb2+(aq) + 2F−(aq)

According to Le Châtelier’s principle, more PbF2(s) will dissolve if a disturbance causes the equilibrium position to shift from left to right. Adding a common ion, either Pb2+(aq) from Pb(NO3)2 or F−(aq) from NaF, will shift the equilibrium position to the left, precipitating additional PbF2(s). Adding the strong acid HNO3 will increase the solubility of PbF2(s), causing more PbF2(s) to dissolve, since F−(aq) is a weak base that will react with the acid (H3O+, generated from HNO3) according to the equation,

F−(aq) + H3O+(aq) ⇌ HF(aq) + H2O(l)

Although it may seem that adding PbF2(s) would shift the equilibrium position to the right, causing additional PbF2(s) to dissolve, since PbF2(s) is a pure solid and not included in the reaction quotient, Q = [Pb2+][F−]2, it has not effect on the equilibrium position.

The major disadvantage is - Ozone decomposes quickly and does not provide long-term protection against possible contamination as the water is piped through a municipal distribution system.

The gas ozone (O3) is unstable. As a result, it breaks down quickly, oxidizing any organic impurities present in the water including bacteria, viruses, and germs, but because it is a gas, it leaves the water after the oxidation is complete. Therefore, when the ozone started to disintegrate at first, the water may have various additional contaminants that mix with it as it travels through the municipal distribution system. Water carries through the new pollutants from the pipes. Ozone therefore has no long-term effect.

Chlorination produces trihalomethane, not ozonation, hence the expansiveness of ozone is dependent on the impurity of the water. Trihalomethane is produced by chlorination, not ozonation. Although ozone as a gas has a faint odor, when it is combined with water, it oxidizes the pollutant and breaks down, leaving no ozone in the water. Therefore, water does not smell like ozone.

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The correct answer is:Only statements 1 and 2 are correct.

1) The bond is planar.

2) There is free rotation about the carbonyl carbon and nitrogen bond.

The bond is planar: True, Peptide bond is a planar bond because it is composed of a double bond between the carbonyl carbon and nitrogen, and the atoms on either side of the double bond are sp2 hybridized. There is free rotation about the carbonyl carbon and nitrogen bond: True, the peptide bond between amino acids in a protein is a single bond, which allows for rotation about the bond, this is one reason proteins can adopt many different conformations.There is substantial double-bond character to this bond: False, the peptide bond is actually a single bond, although it has some double-bond character, it is not a double bond.There is a net negative charge on nitrogen and net positive charge on oxygen: False, both nitrogen and oxygen atoms in a peptide bond are neutral, as there is no charge separation in the bond.

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Joe Viskocil is not a fan of big explosions because it is is either lopsided or squashed and not spherical.

This is defined as a sudden, violent burst of energy which is associated with a rapid expansion of volume.

Joe Viskocil doesn't like big explosions because it is is either lopsided or squashed. and capable of creating more damage.

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