4. Rank the listed elements from largest electronegativity at the top, to smallest electronegativity at
the bottom
(1 Point)
1 Selenium (34)
2 Sulfur (16)
3 Chlorine (17)

Answer:

Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb

Explanation:

From the periodic table, we have;

The atomic number of zinc, Zn = 30

The atomic mass of zinc, Zn = 65.38 amu

The molar mass of zinc, Zn = 65.38 g/mol

The atomic number of lead, Pb = 82

The atomic mass of lead, Pb = 207.2 amu

The molar mass of lead, Pb = 207.2 g/mol

Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;

Mass of 1 mole of Zn = 65.38 grams

Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles

0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn

Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles

The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb

The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.

Amount of Pb gained = 0.43 g ≈ 0.4 g

Answer:

Metal Physical Properties:

Lustrous (shiny)

Good conductors of heat and electricity.

High melting point.

High density (heavy for their size)

Malleable (can be hammered)

Ductile (can be drawn into wires)

Usually solid at room temperature (an exception is mercury)

Cyclohexane and cyclohexene have approximately the same bond angle in their favored conformations. the correct answer C.

In their preferred conformations, cyclohexane and cyclohexene have a bond angle that is quite similar. The bond angle of both of these molecules is close to 120 degrees in their preferred conformations. The chair conformation, in which the bonds are as widely apart as feasible, is a more stable shape that the molecules can adopt thanks to this bond angle.

The preferred conformations of the other listed cyclic hydrocarbons, however, have differing bond angles. For instance, the bond angles of cyclopropane and cyclobutane are roughly 60 degrees and 90 degrees, respectively.

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Answer:

We round numbers so we can find an answer or an estimate that will be close to the actual answer. Rounding numbers is also another way to get close to an exact answer without the trouble of having to calculate every number.

Answer:

Rounding numbers make the numbers easier and more simple to use . Though they may less accurate because of the changes number . Rounding is mainly used for estimates

Answer:

The answer is B

Explanation:

The moon is in-between the sun and the Earth during a new moon.

Answer:

Equilibrium Constant Definition An equilibrium constant, Keq, is a variable that describes a chemical reaction’s tendency to proceed to completion, meaning all the reactants are converted to products. The equilibrium of a reaction is the point at which the conversion of reactants into products equals the conversion of products back into reactants.

Citation:

Biologydictionary.net Editors. "Equilibrium Constant." Biology Dictionary, Biologydictionary.net, 21 Feb. 2017, https://biologydictionary.net/equilibrium-constant/.

Acetyl-CoA from the oxidation of fatty acids can be used in the Krebs cycle.

The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the mitochondria of cells, and it plays a crucial role in cellular respiration. Acetyl-CoA, which is produced from the breakdown of glucose, amino acids, and fatty acids, enters the Krebs cycle and is further broken down to produce energy in the form of ATP.

Fatty acids are an important source of energy for the body, especially during prolonged periods of fasting or exercise. When the body needs energy, stored fats are broken down into fatty acids, which are then transported to the liver and other tissues where they are oxidized to produce acetyl-CoA. This acetyl-CoA can then enter the Krebs cycle to produce energy.

The process of fatty acid oxidation is also important for maintaining healthy blood glucose levels, as it helps to prevent the buildup of harmful fatty acids in the liver. Overall, the oxidation of fatty acids and use of acetyl-CoA in the Krebs cycle is an essential part of cellular energy metabolism.

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Answer:

Explanation:

The reaction undergoing least change in volume will have lowest change in entropy .

1 ) C₂H₂(g) + 5/2O₂(g) → 2CO₂(g) + H₂O(g)

change in volume = 2.5 +1 - ( 2 + 1 ) = 0.5

2 ) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

change in volume = 2 +1 - ( 2 + 1 ) = zero

3 ) C₂H₆(g) + 7/2O₂(g) → 2CO₂(g) + 3H₂O(g)

change in volume = 3 +2 - ( 3.5  + 1 ) = 0.5

4 ) C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g)

change in volume = 2 +2 - ( 3  + 1 ) = zero

Hence least change in volume is in case no - 2 and 4 .

In reaction

C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(g) and

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

∆S° or change in entropy is least .

Answer:

In natural selection, organisms adapt to the environment to best suit nature's needs to survive. In selective breeding, it's as if nature were humans and the humans can choose which organisms can survive and die. They do it so they can develop organisms with desirable characteristics.

Answer:

Quick you said:

-Purpose/Question

Ask a question.

-Research

Conduct background research. Write down your sources so you can cite your references. In the modern era, a lot of your research may be conducted online. Scroll to the bottom of articles to check the references. Even if you can't access the full text of a published article, you can usually view the abstract to see the summary of other experiments. Interview experts on a topic. The more you know about a subject, the easier it will be to conduct your investigation.

-Hypothesis

Propose a hypothesis. This is a sort of educated guess about what you expect. It is a statement used to predict the outcome of an experiment. Usually, a hypothesis is written in terms of cause and effect. Alternatively, it may describe the relationship between two phenomena. One type of hypothesis is the null hypothesis or the no-difference hypothesis. This is an easy type of hypothesis to test because it assumes changing a variable will have no effect on the outcome. In reality, you probably expect a change but rejecting a hypothesis may be more useful than accepting one.

-Experiment

Design and perform an experiment to test your hypothesis. An experiment has an independent and dependent variable. You change or control the independent variable and record the effect it has on the dependent variable. It's important to change only one variable for an experiment rather than try to combine the effects of variables in an experiment. For example, if you want to test the effects of light intensity and fertilizer concentration on the growth rate of a plant, you're really looking at two separate experiments.

-Data/Analysis

Record observations and analyze the meaning of the data. Often, you'll prepare a table or graph of the data. Don't throw out data points you think are bad or that don't support your predictions. Some of the most incredible discoveries in science were made because the data looked wrong! Once you have the data, you may need to perform a mathematical analysis to support or refute your hypothesis.

-Conclusion

Conclude whether to accept or reject your hypothesis. There is no right or wrong outcome to an experiment, so either result is fine. Accepting a hypothesis does not necessarily mean it's correct! Sometimes repeating an experiment may give a different result. In other cases, a hypothesis may predict an outcome, yet you might draw an incorrect conclusion. Communicate your results. The results may be compiled into a lab report or formally submitted as a paper. Whether you accept or reject the hypothesis, you likely learned something about the subject and may wish to revise the original hypothesis or form a new one for a future experiment.

Answer: Potassium is 39.10 g/mol

Explanation: The numbers below the element are the molar mass.

Answer: Potassium(K): 39.10 g/mol

Explanation:

Nitrogen group element, any of the chemical elements that constitute Group 15 (Va) of the periodic table. The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi), and moscovium (Mc).

They are also known as reactive metals !

Acetic acid will corrode metals since it is acidic, forming acetate salts in the process. For instance, acetic acid and magnesium (Mg) will combine to generate magnesium acetate

What is the role of magnesium in the body?

Magnesium is required by the body to keep its muscles, especially the heart, healthy. According to research, magnesium is crucial for heart health. A 2018 research found that a person's risk of cardiovascular issues can rise if they have a magnesium shortage. This is partially brought on by its cellular functions.

What are supplements for magnesium?

A mineral called magnesium that is necessary for the body's regular bone structure. Although most people acquire their magnesium through food, if levels are extremely low, magnesium supplements may be necessary.

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Answer:

Yes

Explanation:

The process of respiration and burning are similar in the following ways: Both respiration and burning require oxygen. Energy is released during both respiration and burning. The products produced (carbon dioxide and water) are the same for both respiration and burning.

Answer:

Yes

Both Respiration and Burning uses oxygen. Both Respiration and Burning produces energy. Both Respiration and Burning gives out carbon dioxide as the end product. The overall chemical reactions of both Respiration and Burning are the same.

Explanation:

Please mark me brainliest if correct

a) The addition of two electrons to Se²⁻ increases the electron cloud

c) The compound B minimizes the formal charges

f) The structure D has the higher boiling point and the intermolecular force that the two molecules have in common is the dispersion forces.

g) There are strong dipole forces in D that does not exist in F

We know that the atomic radius and the ionic radius are the parameters that does occur down the group and across the period. We know that down the group, the atomic radius would increase as we add more shells but across the period, the ionic radius would decrease as we add more nuclear charge.

Given the structures that have been shown, the structure B minimizes the nuclear charge as we can see that the octet of all the elements that are in the compound have been satisfied and there are no formal charges in the molecule.

Compound D has a higher boiling point than the compound E because the compound D is not symmetrical while the compound E is.

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The temperature at which 24.6 g of chlorine gas, Cl₂ will exert a pressure of 652 mmHg when confined in a 8.5 1 L container is -16 °C

We'll begin by obtaining the number of mole of chlorine gas, Cl₂ in the container. Details below:

Mole = mass / molar mass

Mole of of chlorine gas, Cl₂ = 24.6 / 71

Mole of of chlorine gas, Cl₂ = 0.346 mole

Finally, we shall determine the temperature. This is shown below:

PV = nRT

0.858 × 8.51 = 0.346 × 0.0821 × T

Divide both sides by (0.346 × 0.0821)

T = (0.858 × 8.51) / (0.346 × 0.0821)

T = 257 K

Subtract 273 to obtain answer in °C

T = 257 - 273

T = -16 °C

Thus, can conclude that the temperature is -16 °C

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Answer:

battery, phone cover, model of phone, plastic cover phone by rain oil or some harmful effects , need wire Stricker to make phone good so the people buy it and some inner parts

Explanation:

Hope this helps:)

The possible fuels that can be used are, LPG (Liquefied petroleum gas), CNG (Compressed Natural Gas), Biogas, and fossil fuels.

An ideal fuel has the following characteristics:

Thus, LPG (Liquefied petroleum gas), CNG (Compressed Natural Gas), Biogas, and fossil fuels are ideal fuels and can be used in the eco-friendly reactor.

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the maximum number of electrons an atom can have with the sublevel designation is 2 electrons.

to calculate the maximum number of electrons an atom can have with the sublevel designation can be calculate as below:

as we know that,

The energy level of each of an atom with the given sublevel designations determines the maximum number of electrons the atom can occupy.

(a) For n = 2, I = 1, ml = 0,

The energy level is calculated as;

Energy level = 2(1) + 1 = 3 sub-orbtials

= -1  0  1  : ( 2 electrons each)

Thus, the maximum number of electrons an atom can have with the sublevel designation is 2 electrons.

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Phenyl bromide is the limiting reagent in the Grignard reaction, as it produces the smallest number of moles of the Grignard reagent compared to magnesium and carbon dioxide.

The balanced equation for the Grignard reaction between phenyl bromide and carbon dioxide is:

C₆H₅Br + Mg + CO₂ → C₆H₅COOMgBr

To determine the limiting reagent in the reaction, we need to calculate the number of moles of each reactant and compare them to the stoichiometric coefficients in the balanced equation. The limiting reagent is the reactant that is completely consumed in the reaction and limits the amount of product that can be formed.

The molar mass of phenyl bromide is 157.01 g/mol, and the mass used is 1.4555 g, so the number of moles of phenyl bromide is:

1.4555 g / 157.01 g/mol = 0.009271 mol

The molar mass of magnesium is 24.31 g/mol, and the mass used is 0.5734 g, so the number of moles of magnesium is:

0.5734 g / 24.31 g/mol = 0.0236 mol

The molar mass of carbon dioxide is 44.01 g/mol, and the mass used is 10.0 g, so the number of moles of carbon dioxide is:

10.0 g / 44.01 g/mol = 0.227 mol

Finally, the molarity of the HCl solution is 6.0 mol/L, and the volume used is 30.2 mL, or 0.0302 L, so the number of moles of HCl is:

6.0 mol/L x 0.0302 L = 0.1812 mol

According to the balanced equation, one mole of phenyl bromide reacts with one mole of magnesium and one mole of carbon dioxide to produce one mole of the Grignard reagent. Therefore, the limiting reagent is the reactant that produces the smallest number of moles of the Grignard reagent.

Using the above calculations, we find that the number of moles of the Grignard reagent that can be formed from each reactant is:

Since the smallest number of moles is produced from phenyl bromide, it is the limiting reagent in the reaction.

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The given double displacement reaction can be balanced as written below:

\(\rm 3CaCl_{2} + 2Na_{3}PO_{4} \rightarrow Ca_{3}PO_{4} + 6 NaCl \\\)

Displacement reactions are those in which one or two groups are replaced to form the new products. There are both single displacement reaction and double double displacement reactions.

In single displacement reactions, only one reactant will be replaced in the reaction whereas in double displacement reactions, two groups from the reactants are exchanged each other.

In the given reaction, the phosphate group is replaced to Ca and the Cl is group is shifted to Na metal as written in the chemical equation.

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If calcium reacts with a nonmetal, the charge of the calcium cation be +2. Calcium is metal and when it reacts with non metal ionic compound is formed.

The term non-metals are defined as elements on the right side of the periodic table. Non-metals may be gases, liquids or solids. Non-metals are dull, not shiny like metals. Calcium is an example of a non-metal.

When the calcium donates its electrons, it becomes electron-deficient species and has 2 more protons than electrons. That positively charged calcium ion is called as a cation.  

Calcium donated two electrons to the nonmetal and it has +2 charge.

Thus, If calcium reacts with a nonmetal, the charge of the calcium cation be +2.

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Answer:

1. The three parts of an atom are:

2. A neutron is a particle of an atom with a neutral charge.

Hope this helps!

Answer: he shot tiny alpha particles throug a piece of gold foil.

Explanation:

The weakness of the rutherford model of the atom that bohr addressed is that

The Rutherford model of the atom proposed by Ernest Rutherford in 1911 shows that the atom is much hollow space with its mass concentrated at the center being surrounded by electrons. It is the planetary model.

The Bohr model of the atom proposed by Neils Bohr in 1913 suggests that

The weakness of the rutherford model of the atom that bohr addressed is that

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Answer:

The answer is C4H8.

Explanation:

I hope it helps you

Pass your test fast okay

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The parent nucleide that produces Am-241 through beta decay is Plutonium-241. This is because Plutonium-241 undergoes beta decay to form Americium-241, emitting a beta particle in the process. Knowing this information is crucial in nuclear physics and chemistry, as it helps us understand how different isotopes decay over time.

When a nuclide undergoes beta decay and produces Am-241 (Americium-241), the parent nuclide is Plutonium-241.

In beta decay, a neutron is converted into a proton, which results in an increase in the atomic number (protons) of the element, while the mass number (protons + neutrons) remains unchanged.

In this case, Plutonium-241 (with atomic number 94) decays through beta decay and forms Americium-241 (with atomic number 95).

The other isotopes mentioned, such as Plutonium-240, Plutonium-242, Curium-242, and Curium-241, do not result in Am-241 after beta decay due to differences in their mass numbers and atomic numbers.

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10.3 g of Al is required to completely react with 30.0 g of MnO₂. The correct answer is option D.

Manganese dioxide reacts with aluminum to produce manganese and aluminum oxide. Here's the balanced chemical equation: 3MnO₂ + 4Al → 3Mn + 2Al₂O₃. Now, let's calculate the mass of Al required to react completely with 30.0 g of MnO₂: From the balanced equation, we can see that 3 moles of MnO₂ react with 4 moles of Al.

The molar mass of MnO₂ is 86.94 g/mol. 30.0 g of MnO₂ is equal to:30.0 g / 86.94 g/mol = 0.3444 mol MnO₂. According to the balanced equation, 0.3444 mol of MnO₂ requires: 4/3 × 0.3444 mol = 0.4592 mol of Al. The molar mass of Al is 26.98 g/mol. 0.4592 mol of Al is equal to: 0.4592 mol × 26.98 g/mol = 12.4 g of Al. Therefore, 12.4 g of Al is required to completely react with 30.0 g of MnO₂. Hence, option D is the correct answer.

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