A 5-column table with 2 rows. Column 1 is labeled number of protons, with entries A and D; column 2 is number of neutrons, with entries 7 and E; Column 3 is atomic number, with entries B and 26; Column 4 is Mass Number, with entries 15 and 56, and Column 5 is Element (symbol) with entries C and F. Using the periodic table, complete the table to describe each atom. Type in your answers.

The electron donor in the Zn(s) + Cu^2+(aq) —>Zn^2+(aq) + Cu(s) system is zinc (Zn) which is being oxidized. Therefore, the electron donor in this system is the reducing agent.

Photons move in straight lines but sometimes, a photon's path is bent after passing through the box. These photons are usually UV photons, but there were some other colors of photons as well.

The photons' paths are bent when they collide with an electron. The electron absorbs energy from the photon, causing the photons to move in a different path than it was before. UV photons are more likely to change paths because they contain more energy than the other colors. What is happening here is a process called Compton scattering. This is when an incoming photon collides with an electron, which causes the photon to scatter at a different angle and lose energy. This process is more likely to occur with photons that have higher energy, such as UV photons. When this happens, the photon's path is bent, and it moves in a different direction than it was before.

In summary, photons usually move in straight lines, but they can be bent when they collide with an electron. This is known as Compton scattering, and it causes the photon to scatter at a different angle and lose energy. UV photons are more likely to change paths because they contain more energy than other colors.

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The control mechanism you're referring to, where enzyme action stops due to a buildup of end product, is called A. negative feedback.

Negative feedback occurs when the accumulation of an end product inhibits the initial enzyme responsible for its production. This process helps maintain the optimal levels of substances within the cell and prevents overproduction. Here's a step-by-step explanation:

1. An enzyme catalyzes a reaction, leading to the formation of a product.
2. As the product accumulates, it reaches an optimal level within the cell.
3. When the optimal level is reached, the end product binds to the enzyme or its regulatory site, decreasing the enzyme's activity.
4. As a result, the production of the end product slows down, maintaining a balance within the cell.

This process ensures that resources and energy are not wasted in producing excess product and helps maintain homeostasis within the cell.

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B. "The change in"

I saw that symbol a lot in chemistry and physics so I immediately recognized it.

the  reactions would have a decrease in entropy is 2NO2(g) → N₂04(9).

The quantity of thermal energy each unit of temperature in a system that cannot be used to carry out beneficial work is known as entropy. While work is produced by ordered molecular motion, entropy also serves as a proxy for a system's molecular disorder or unpredictability.

All parts of our daily life are impacted by entropy, which is merely a measure of disorder. In actuality, it can be considered nature's tax. Disorder spreads over time if left uncontrolled. Systems collapse into chaos when energy disperses. Something is considered to be more entropic the more disorganized it is.

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Answer:

points go brrrrrr

Explanation:

Answer:

Beans.

Explanation:

Answer: a. nitrogen

Explanation:

Nitrogen comprises of five valence electrons in its outermost shell which enables it to form triple, double and single bonds with other atoms. It can share three electrons with other nitrogen atom and form a covalent bond. Moreover, nitrogen can form multiple bonds with itself and with other elements due to its small size and high electronegativity. Nitrogen, carbon, fluorine, and oxygen are the elements with which nitrogen can form bonding.

Answer:

24m/s

Explanation:

a=change of v/change of t

6m/s^2=v/4s

multiply both sides by 4s

v=24m/s

Answer:

C

Explanation:

Living systems is the study of biology. Not A

The stars and planets is the study of astronomy. Not B

The answer is C

D is too confining. Chemistry does not always take place in a test tube.

To determine the number of grams present in 2.93 x 10²³ atoms of manganese (Mn), we need to use the atomic weight of manganese and Avogadro's number.

The atomic weight of manganese is 54.94 g/mol. Avogadro's number is 6.022 x 10²³ particles per mole.

First, we need to convert the given number of atoms to moles using Avogadro's number.

2.93 x 10²³ atoms Mn x (1 mol Mn/6.022 x 10²³ atoms Mn) = 0.0485 moles Mn

Next, we can use the atomic weight of manganese to convert moles to grams.

0.0485 moles Mn x (54.94 g Mn/mol) = 2.67 grams Mn

Therefore, 2.93 x 10²³ atoms of manganese (Mn) weigh approximately 2.67 grams.

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Answer:

Density = mass/volume

= 44/22.4

= 1.96 gram/liter

The density of the Carbon Dioxide at S.T.P. (Standard Temperature and Volume) is 1.96 gram/liter.

Answer:

When two or more atoms chemically bond together, they form a molecule. Sometimes the atoms are all from the same element. ... In a covalent bond, electrons are shared between atoms. The bonds between the two hydrogen atoms and the oxygen atom in a molecule of water are covalent bonds

Explanation:

Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules.

Answer:

Molecules are formed when one or more atom of an element/elements are chemically joined together to create a new type of matter.

Explanation:

Hope it helped!

Answer:

177.3kg C₂₁H₄₄

Explanation:

Based on the chemical reaction:

C₂₁H₄₄ → 3C₂H₄ + C₁₅H₃₂

Where 1 mole of C₂₁H₄₄ produce 3 moles of ethene, C₂H₄.

To solve this question we need to determine the moles of ethene in 50.4kg. 1/3 these moles are the moles of C₂₁H₄₄ that must be added:

Moles Ethene -Molar mass: 28.05g/mol-

50.4kg = 50400g * (1mol / 28.05g) = 1796.8 moles of ethene

Moles C₂₁H₄₄:

1796.8 moles of ethene * (1 mol C₂₁H₄₄ / 3 mol C₂H₄) = 589.93 moles C₂₁H₄₄

Mass C₂₁H₄₄:

589.93 moles C₂₁H₄₄ * (296g / mol) = 177283g =

To find the number of moles represented by a certain number of particles, you can use Avogadro's number and the concept of molar mass.

Avogadro's number (symbolized as N_A) is a fundamental constant that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × 10²³ particles/mole.

Molar mass is the mass of one mole of a substance and is expressed in grams/mole. It represents the sum of the atomic masses or molecular masses of the constituent particles in a substance.

To calculate the number of moles, you can follow these steps;

Determine the number of particles you have (atoms, molecules, ions, etc.).

Identify the molar mass of the substance or the average molar mass if it's a mixture.

Divide the number of particles by Avogadro's number to convert them into moles. The formula is:

Moles = Number of Particles / Avogadro's number

Moles = Number of Particles / (6.022 ×10²³ particles/mole)

The result will give you the number of moles represented by the given number of particles.

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--The given question is incorrect, the correct question is

"Explain how you would find the number of moles that are represented by a certain number of representative particles."--

The volume of the science laboratory can be calculated by multiplying its dimensions: 15.2 m * 8.2 m * 3.1 m = 398.608 m³. To determine the number of ping pong balls that can fit in the laboratory, we need to convert the volume of the laboratory to cubic centimeters and then divide it by the volume of a ping pong ball. Therefore, the laboratory can accommodate approximately 3,986,080 ping pong balls.

To find the volume of the science laboratory, we multiply its dimensions: 15.2 m * 8.2 m * 3.1 m = 398.608 m³. However, since the volume of the ping pong ball is given in cubic centimeters, we need to convert the volume of the laboratory to the same unit. Since 1 m³ is equal to 1,000,000 cm³, we can multiply the volume of the laboratory by 1,000,000 to convert it to cubic centimeters: 398.608 m³ * 1,000,000 cm³/m³ = 398,608,000 cm³.

Next, we need to determine how many ping pong balls can fit in this volume. Dividing the volume of the laboratory by the volume of a single ping pong ball, we get: 398,608,000 cm³ / 100.0 cm³ = 3,986,080 ping pong balls. Therefore, approximately 3,986,080 ping pong balls can fit in the empty science laboratory.

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The number of protons and the number of neutrons is 14.

The most common isotope of silicon is silicon 28 with the mass number=28 and atomic number=14.

An atomic number is defined as the number of protons or the number of electrons present in the given element. The atomic number is used to define the chemical properties of the elements. The atomic number of silicon is 14. Hence the number of protons is 14.

The mass number is defined as the combined total of the number of protons and the number of neutrons present in the given element. The mass number of silicon is 28. Hence the number of neutrons=28-14=14.

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Answer:

The RMM of Ca (OH)2 is

40+ (16+1)2

40+(17)2

40+34

74

The RMM of Al2SO4 is

(27×2)+32+(16×4)

54+32+64

=150

Explanation:

Note that the RAM of:

Ca=40

O=16

H=1

Al=27

S=32

N is being reduced and is the oxidizing agent.

The given unbalanced chemical equation is:HNO3 + HBr → NO + Br2 + H2O

To balance the above chemical reaction, we need to make sure that the number of atoms of all the elements present in the reactants is equal to the number of atoms of the same elements present in the products.

Thus, we can balance the above reaction as follows:

            HNO3 + 5HBr → NO + 3Br2 + 3H2O

In the above chemical equation, the oxidation state of N changes from +5 to +2.

Therefore, nitrogen (N) is being reduced and is the oxidizing agent.

Thus, the answer is as follows:Atom oxidized: Nitrogen (N).

Given: HNO3 + HBr → NO + Br2 + H2O

The oxidation state of H is +1, N is +5, Br is -1, O is -2, and that of NO is +2.

Now, let's find out the oxidation states of each element on both sides of the equation:

            HNO3 + HBr → NO + Br2 + H2O+5  

         -1          0           -1    -2→+2      0          +2          0     -2

Oxidation states of N change from +5 to +2, and the oxidation states of Br change from -1 to 0.

Thus, N is being reduced and is the oxidizing agent. Therefore, the answer is Nitrogen (N).

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Nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.

Electronegativity is the tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.

An element in the periodic table with a high electronegativity will automatically have a high electron affinity.

Metals (low electronegativity) are known to lose electrons to non-metals (high electronegativity), hence, nonmetals have the ability to attract electrons better than metals because they have a higher electron affinity or electronegativity than metals.

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Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Aluminium, or 26.981538 grams.

The concentration of the unknown sodium hydroxide in M is 9.5.

On titrating the solution of sodium hydroxide and hydrochloric acid, we will be using the following relation for molarity and concentration -

Molarity × volume of HCl = Molarity × volume of NaOH

Keep the values in stated equation to find the concentration of sodium hydroxide-

3.5 × 45 = M × 16.57

Rewriting the equation according to molarity of sodium hydroxide

M = 3.5 × 45/16.57

Performing multiplication and division

M = 9.5 M

Hence, the concentration is 9.5 M.

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The molarity of the H₂SO₄ solution is 0.101 M. The enthalpy of formation of SO₃(g) is 396 kJ/mol.

To determine the molarity of the H₂SO₄ solution, we can use the concept of stoichiometry and the volume and concentration of the NaOH solution used in the titration.

Given:

Volume of H₂SO₄ solution = 22.5 mL

Volume of NaOH solution used = 43.2 mL

Concentration of NaOH solution = 0.105 M

First, we need to determine the moles of NaOH used in the titration. We can do this by multiplying the volume of NaOH solution used by its concentration:

Moles of NaOH = (43.2 mL) x (0.105 mol/L) = 4.536 mol

According to the balanced equation for the reaction between H₂SO₄ and NaOH, the stoichiometric ratio is 1:2. This means that 1 mole of H₂SO₄ reacts with 2 moles of NaOH.

Therefore, the moles of H₂SO₄ in the solution would be half of the moles of NaOH used:

Moles of H₂SO₄ = (1/2) x (4.536 mol) = 2.268 mol

Now, we can calculate the molarity of the H₂SO₄ solution by dividing the moles of H₂SO₄ by the volume of the solution in liters:

Molarity of H₂SO₄ = (2.268 mol) / (22.5 mL / 1000 mL/L) = 0.101 M

Therefore, the molarity of the H₂SO₄ solution is 0.101 M.

Regarding the enthalpy of formation of SO₃(g), the given enthalpy of reaction (ΔH°rxn) for the reaction 2 SO₂(g) + O₂(g) → 2 SO₃(g) is -198 kJ.

The enthalpy of formation (ΔH°f) of a compound is the enthalpy change when one mole of the compound is formed from its constituent elements in their standard states.

Given:

ΔH°f, kJ/mol SO₂(g) = -297 kJ/mol

To determine the enthalpy of formation of SO₃(g), we can use the following equation:

ΔH°rxn = ΣΔH°f (products) - ΣΔH°f (reactants)

Since we have the ΔH°rxn and the enthalpy of formation of SO₂(g), we can rearrange the equation and solve for ΔH°f of SO₃(g):

ΔH°f (SO₃) = ΣΔH°f (products) - ΣΔH°f (reactants) + ΔH°rxn

ΔH°f (SO₃) = 0 kJ/mol (since it is a product) - 2 x (-297 kJ/mol) + (-198 kJ/mol)

ΔH°f (SO₃) = 594 kJ/mol + (-198 kJ/mol) = 396 kJ/mol

Therefore, the enthalpy of formation is 396 kJ/mol.

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First, we will calculate the number of moles of mixture of Xenon and Neon gases.Number of moles of mixture of Xenon and Neon gases:

Let x be the mole fraction of Neon.

Therefore, (1 - x) is the mole fraction of Xenon

.Mole fraction of Neon + Mole fraction of Xenon = 1x + (1 - x) = 1x = 1 - (1 -

x = 0 + x

x = 0.279

Mole fraction of Neon = 0.279

Mole fraction of Xenon = 0.721

Number of moles of gas = (Total Pressure * Volume)/(Gas Constant * Temperature)

Number of moles of Xenon = (7.10 atm * 16.75L * 0.721)/(0.08206 * (273 + 30))

Number of moles of Xenon = 8.44 moles

Number of moles of Neon = (7.10 atm * 16.75L * 0.279)/(0.08206 * (273 + 30))

Number of moles of Neon = 3.29 moles

Now, we can calculate the partial pressure of Xenon and Neon.

Partial pressure of Xenon:

Partial Pressure of Xenon = Mole fraction of Xenon * Total Pressure

Partial Pressure of Xenon = 0.721 * 7.10 atm

Partial Pressure of Xenon = 5.12 atm

Partial pressure of Neon

Partial Pressure of Neon = Mole fraction of Neon * Total Pressure

Partial Pressure of Neon = 0.279 * 7.10 atm

Partial Pressure of Neon = 1.98 atm

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Stars are made of mostly hydrogen and helium, held together by the Sun.

Are stars mostly made of hydrogen and helium?

Massive celestial objects called stars, which are primarily composed of hydrogen and helium, generate light and heat from the churning nuclear forges inside their cores. The other flecks of light we see in the sky, besides our sun, are all light-years away from Earth.

What holds a star together?

The process responsible for a star's luminosity is known as nuclear fusion. The pull of gravity is resisted by the hot gas as it pushes outward. A star is created by this harmony of forces. It maintains the star's structural integrity and maintains its temperature throughout the majority of its lifespan.

What causes stars to group together?

The majority of stars in the Milky Way are found in pairs or clusters of multiple stars, which is consistent with predictions made by three-dimensional computer models of star formation that the collapsing spinning clouds of gas and dust may split into two or three blobs.

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Answer:

No

Explanation:

Ionic bonding is where an one atom wants to gain e- while the other wants to lose e-

Such as NaCl.

Answer:

Earthquake...

Explanation:

I mean, its kinda the only one that makes sense aha

And took test!

The word earthquake identifies the shaking that results from movement under Earth's surface.

Hence, option 1 is the answer.

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Answer:

Same charge.

Explanation:

Ions in the same group tend to form ions with the same charge. Elements belong to the same group on the periodic table form ions with the same charge because they have the same number of valence electrons. For example, all members of alkali metals have different number of shells but same number of electrons in their outermost shell so due to same number of outermost shell these alkali metals will make bonding with halogens which is a seven group that have seven electrons and needs one electron for attaining stability and forming ions on both atoms.

Answer: 1 mol C8H18 produces 9 mol H2O

Explanation: reaction : C8H18 + 12.5 O2 ⇒ 8 CO2 + 9 H2O