Factors that affect solubility in a liquid and solid are ?

Answer:

Products have less potential energy than reactants.

Explanation:

Let's remember the concept of an exothermic reaction: a chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.

Now, let's see how looks a potential energy diagram for an exothermic reaction:

This represents that the products have less potential energy than reactants.

In this type of reaction, a better reactive compound displaces the less reactive compound. For instance, zinc exists better reactive than hydrogen, therefore zinc will displace hydrogen.

The reaction, Zn + \(H_2SO_4\) →  \(ZnSO_4 + H_2\), exists an illustration of single replacement reaction. A single replacement reaction exists even comprehended as a displacement reaction.

The general structure of a displacement reaction exists:

A + BC → AC + B

In this type of reaction, a better reactive compound displaces the less reactive compound. For instance, zinc exists better reactive than hydrogen, therefore zinc will displace hydrogen.

This equation indicates the development of a chemical difference. When one molecule of zinc and one molecule of sulphuric acid responds it results in the exhibition of one molecule of zinc sulfate and one molecule of hydrogen.

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Both the Heisenberg uncertainty principle and the Schrödinger wave equation led to the concept of atomic orbitals, hence option D is correct.

The Heisenberg uncertainty principle claimed that it was impossible to know an electron's position and velocity at the same time. It gave rise to the notion that an electron would follow an orbital path, along which a general area could be identified.

It is defined as the presumption that a classical ensemble is susceptible to random momentum fluctuations of a strength that is dictated by and scales inversely with uncertainty in position.

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Answer:

+4

Explanation:

In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):

Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.

⇒ x + (−2) + (−2) = 0

x = +4

So the oxidation no. of Pb is +4.

I hope this helps.

A substantial imbalance between demand and response capability under conditions in which failure has important consequences refers to STRESS. It may affect the functioning of a biological system.

Homeostasis refers to the state of internal (steady) equilibrium, which is required for the normal functioning of a biological system.

Conversely, stress can be defined as any environmental factor (e.g., excessive temperature condition) which is directly affecting the normal functioning of an organism.

Stress may lead to the loss of the homeostatic state when conditions cannot be supported by the organism.

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Answer: A substance is a particular kind of matter with uniform properties

Explanation:

The trapping of heat in the atmosphere due to water vapour and certain gases like carbon dioxide, methane, nitrous oxide and ozone causes the greenhouse effect.

When heat from the sun enters into the atmosphere, most of it gets reflected back to the atmosphere and out of the earth. However, certain gases in the air absorb some of this reflected heat and trap it in the atmosphere which warms up the earth. This process is known as the greenhouse effect and gases that cause the greenhouse effect are called greenhouse gases.

Although, greenhouse gases are relatively small and only make up about 1% of the atmosphere, their climatic impact is huge. The most important greenhouse gas is carbon dioxide as it remains in the atmosphere for the longest time. This is because it doesn't react with the atmosphere, so it can remain in the atmosphere for tens of thousands of years.

Methane traps more heat than carbon dioxide, but it only remains in the atmosphere for 10 - 12 years because it is easily oxidized by oxygen. Ozone acts as a greenhouse gas only when it is close to the ground.

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Answer:



Explanation:

Answer:

Aluminum; [Ne]3s²3p¹

Arsenic; [Ar]3d¹⁰4s²4p³

Explanation:

Aluminum

From the periodic table, we have that aluminum, Al, is located in period 3, and group 3A of the periodic table

Therefore, the noble gas that comes before aluminum in the periodic table is neon Ne

The electronic configuration of aluminum is 1s²2s²2p⁶3s²3p¹

The electronic configuration of neon is 1s²2s²2p⁶

Therefore, the electronic configuration of aluminum in noble gas notation (Ne) is therefore;

[Ne]3s²3p¹

Arsenic

Arsenic is located after argon, Ar on the periodic table

The electronic configuration of arsenic is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p³

The electronic configuration of argon is 1s²2s²2p⁶3s²3p⁶

The electronic configuration of arsenic in noble gas notation (Ar) is given as follows;

[Ar]3d¹⁰4s²4p³

The first blank should be filled with "chemical shift." The chemical shift is the position of a signal on the NMR spectrum, and it is measured in parts per million (ppm). The chemical shift is determined by the magnetic field experienced by the hydrogen atoms in the molecule and is influenced by the surrounding electron density.

The second blank should be filled with "splitting." Splitting is the appearance of a signal on the NMR spectrum and is caused by the spin-spin coupling between neighboring hydrogen atoms. The splitting is based on the formula N+1, where N is the number of equivalent neighboring hydrogen atoms. The splitting pattern gives information about the number and arrangement of hydrogen atoms in the molecule.

The third blank should be filled with "integration." Integration is the area under a signal on the NMR spectrum and is proportional to the number of hydrogen atoms that produce the signal. Integration allows us to determine the relative number of hydrogen atoms in different parts of a molecule and is useful in determining the molecular formula of an unknown compound.

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Answer:  the empirical formula of potassium persulfate is KSO₄, and its molecular formula is K₂S₂O₇.

Explanation:  the empirical formula of potassium persulfate is KSO₄, and its molecular formula is K₂S₂O₇.

Answer:

The magnesium atom is larger.

Explanation:

The magnesium atom is larger because it is on the left side of the Periodic Table (period 3 and group 2) where the atomic radius is larger.

Atomic radius is the distance from the center of the nucleus of an atom to the most external electron shell.

The greater the columbic attractions, the closer the protons in the nucleus are to the electrons in the outer layers, making the size of the atom smaller.

Answer: Increasing the concentration of a base will cause the pH level of the solution to increase. Increasing the concentration of an acid will cause the pH level of the solution to decrease.

Explanation:

Answer: Electron

Explanation:An electron is most likely to be found in an energy level within an atom.

Answer: B disposed of according to your instructor's

directions. :)

Answer:

B. disposed of according to your instructor's  directions.

Explanation:

After completing an experiment all chemical waste should be disposed of according to your instructor's directions.

Chemical wastes should be carefully handled in the laboratory so as not to carelessly release them into the environment. If not properly treated and they are discharged into the environment, they can lead to serious hazards and even pollution. Contamination is another very serious problem attributed to disposing chemical waste carelessly.

Instructor's guides should be followed to dispose chemical wastes.

Answer:

2. examine the properties before and after the change

A) Out of the given options, Pyruvate is the compound that is not a component of the citric acid cycle.

The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid (TCA) cycle, is a central metabolic pathway that occurs in the mitochondria of cells. It is responsible for the oxidation of acetyl-CoA derived from various fuel sources, generating energy in the form of ATP and producing NADH and FADH2.

Pyruvate, which is a product of glycolysis, serves as the starting point for the citric acid cycle. It enters the cycle by being converted into acetyl-CoA through a series of enzymatic reactions.

On the other hand, the compounds α-Ketoglutarate, Succinate, and Malate are all intermediates of the citric acid cycle. They are involved in various steps of the cycle, participating in the generation and transfer of energy-rich electrons and the production of ATP and reduced coenzymes.

Therefore, out of the given options, Pyruvate is the compound that is not a component of the citric acid cycle.

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Answer:

This is literally just the definition of a machine

Answer: 197.26 g Na2S2O3

Explanation:

64.3/103 (molar mass of NaBr)  X 2 moles Na2S2O3 X 158 (molar mass of Na2S2O3.

Answer:

True

Explanation:

It forms a pure element, which I'm guessing is the same as pure substance

The question requires us to calculate the mass necessary to prepare a lead(II) nitrate (Pb(NO3)2) solution, given the volume of the solution and its molar concentration.

The following information was provided by the question:

salt used = Pb(NO3)2

volume of solution = V = 750.0 mL = 0.7500 L

molar concentration of solution = C = 0.20 mol/L

To solve this problem, we'll use two important definitions and their equations: the molar concentration and number of moles.

The molar concentration (C, given in mol/l) is defined as the number of moles of a compound (n, given in moles) divided by the volume of the solution (V, given in liters):

On the other hand, the number of moles of a substance (n, given in moles) can be calculated by dividing the mass of this substance (m, given in grams) by its molar mass (M, given in g/mol):

If we replace n as given by the second equation in the first equation, we'll have:

And, rearranging this last equation, we find an expression to calculate the mass of a substance from the molar concentration of a solution, its volume and the molar mass of the substance:

(where m is the mass, in g, C is the molar concentration, in mol/L, M is the molar mass, in g/mol, and V is the volume, in L).

Since the question provided the values for C and V, we'll only need the molar mass of Pb(NO3)2.

The atomic masses of Pb, N and O are 207.2 u, 14.01 u and 15.99 u, respectively. Thus, the molar mass of Pb(NO3)2 can be calculated as:

molar mass Pb(NO3)2 = (1 * 207.2) + (2 * 14.01) + (6 * 15.99) = 331.2 g/mol

Next, we apply the values of to the equation to calculate the mass of Pb(NO3)2:

Therefore, the mass of Pb(NO3)2 required to prepare 750.0 mL of a 0.20 M solution is 49.68 g.

There are 11.6 mmol of iron in 650 mg of iron.

Given the mass of iron as 650 mg. The molar mass of iron is 55.85 g/mol.

We need to calculate how many millimoles (mmol) are present in the given amount of iron.

We will use the following conversion:

1 g = 1000 mg

1 mol = molar mass in grams

1 mmol = 0.001 mol

Number of moles of iron

= 650 mg ÷ 1000 mg/g

= 0.65 g ÷ 55.85 g/mol

= 0.0116 mol

Number of millimoles of iron

= 0.0116 mol ÷ 0.001 mol/mmolar mass of iron

= 11.6 mmol

Hence, there are 11.6 mmol of iron in 650 mg of iron. Therefore, the correct option is A. 11.6 mmol Fe.

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Sulfurous acid is a weak acid with the molecular formula H2SO3. It has two acidic hydrogen atoms, which can be sequentially neutralized. The successive neutralizations of each acidic hydrogen of sulfurous acid are as follows:

First acidic hydrogen: H2SO3 + NaOH → NaHSO3 + H2O

The molecular equation is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation is H2SO3 + 2OH- → SO32- + 2H2O

Second acidic hydrogen: NaHSO3 + NaOH → Na2SO3 + H2O

The molecular equation is HHSO3 + NaOH → Na2SO3 + H2O

The net ionic equation is HSO3- + OH- → SO32- + H2O

Overall reaction: H2SO3 + 2NaOH → Na2SO3 + 2H2O

The molecular equation for the overall reaction is H2SO3 + 2NaOH → Na2SO3 + 2H2O

The net ionic equation for the overall reaction is H2SO3 + 2OH- → SO32- + 2H2O

In summary, the molecular and net ionic equations for the successive neutralizations of each acidic hydrogen of sulfurous acid are given above.

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none of the above. is the answer

Answer:

c. side chain

Explanation:

c. side chain. The variable part of an amino acid, which is the unique chemical structure that distinguishes one amino acid from another, is the side chain (also known as R-group).

The side chain, commonly referred to as the R-group, is the variable component of an amino acid and the particular chemical structure that sets one amino acid apart from the others. Each amino acid shares the same fundamental structure, which consists of a core alpha carbon atom bound to a hydrogen atom, an amino group (NH₂), an acid group (COOH), and an amino group (NH₂). The particular collection of atoms connected to the core carbon is known as the side chain, and it differs amongst various amino acids. The amino acid's distinct characteristics and roles in protein synthesis and biological processes are determined by the side chain's make-up and structure.

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option A is the correct one

It represents Mp orBp of a substance at a specific pressure

Decomposition is the process by which substances are broken down into simpler compounds.

It involves the breakdown of complex molecules into smaller, more basic components through chemical or biological processes. These processes can include various mechanisms such as hydrolysis, oxidation, fermentation, or enzymatic reactions. Decomposition is a fundamental part of nutrient cycling and plays a crucial role in the recycling of organic matter in ecosystems.

The decomposition of carbonic acid in soft drinks, which can be represented by the chemical equation:

H₂CO₃ → H₂O + CO₂

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The main difference between a homogeneous mixture and a heterogeneous mixture-The components of a homogeneous mixture are evenly distributed.

The main distinction between the two kinds of blends is one of size. Shells, coral, sand, and biological materials may all be distinguished in the sand from a beach if you look at it attentively. It is a complex concoction. But if you look at a big pile of sand from a distance, you can't tell which kinds of particles are which. The mixture is uniform. This may be perplexing!

Consider the sample size of a combination to determine its nature. It is heterogeneous if there are many phases of matter or distinct locations in the sample. The mixture is homogenous if its composition seems uniform no matter where you sample it.

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