The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

A diagram has a triangle at center with gas on top, liquid on bottom right, solid on bottom left. An arrow from gas to liquid is labeled O, and an arrow from liquid to gas is labeled N. An arrow from solid to liquid is labeled P, and an arrow from liquid to solid is labeled Q. An arrow from solid to gas is labeled L, and an arrow from gas to solid is labeled M.
Which arrow represents the change of state described above?

Answer:

the solid melted and gained energy  

it also looks like some of the water evaporated

Explanation:

p.s. also the molecules expanded

The picture shows that a physical change has taken place which converted ice to water.

Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.

Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.

They involve only rearrangement of atoms and are often characterized to be changes which are reversible.

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ANSWER

The molecules or ions in solution can freely intermingle

option F

EXPLANATION

Collision theory states that "before a product can be formed, the reactants need to collide with each other"

This implies that the reacting particles must collide with each other due to an increase in the temperature or any other factors that affect the rate of reaction before the products can be used. Solutions are often used because the reactant ions or molecules can move freely in solution and they are likely to collide with each other to form a product.

Therefore, the correct answer is option F

The number of electrons that can have the following designations are:

a. 5dz2: 2 electrons

b. 1d: 2 electrons

c. 5d: 10 electrons

d. 7p: 6 electrons

e. 6d: 10 electrons

f. n=3: 18 electrons

The designations given in the question refer to different types of atomic orbitals. The number of electrons that can occupy a particular orbital is determined by the Pauli exclusion principle and the Aufbau principle.

The Pauli exclusion principle states that no two electrons in an atom can have the same set of quantum numbers. The Aufbau principle states that electrons fill atomic orbitals in order of increasing energy, starting with the lowest energy level. In general, s orbitals can hold up to 2 electrons, p orbitals can hold up to 6 electrons, d orbitals can hold up to 10 electrons, and f orbitals can hold up to 14 electrons.

Therefore, based on the designations given in the question, we can determine the maximum number of electrons that can occupy the corresponding atomic orbitals as mentioned above. The number of electrons that can have a specific designation in an atom is determined by the type of atomic orbital and the principles of quantum mechanics.

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Answer:

This isnt a question

Explanation:

Answer:

this isn’t a question

Explanation:

Not a question

Answer:

hydropowered

Explanation:

 took the test

Hydropower is the energy source that produces the least amount of air pollution. Therefore, the correct option is option D.

Energy is The capacity or ability to do tasks, such as the ability to forcefully move an object. Energy can exist in a multitude of forms and can change from one to another, including thermal, mechanical, chemical, and nuclear energy. The flow of electric charges known as electrons is what generates electrical energy.

Energy is utilised to make a wide range of goods, power transportation, and power the appliances we use to heat and light our houses. The production of electricity is the main purpose of these various energy sources. All of these many energy sources contribute to the electrical power reserve that is then distributed to various locations via high-powered lines. Hydropower is the energy source that produces the least amount of air pollution.

Therefore, the correct option is option D.

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Answer:

Refer to the periodic table to do this.

Explanation:

1. Na, K, Cs Fr, Rb

  Sodium, Potassium, Cesium, Francium, Rubidium

  3, 4, 6, 7, 5

Ascending order: Na, K, Rb, Cs, Fr

2. Ca, Sr, Ba, Ra, Mg

   Calcium, Strontium, Barium, Radium, Magnesium

   4, 5, 6, 7, 3

Ascending Order: Mg, Ca, Sr, Ba, Ra

When doing the electronic configuration of the elements, count how many number of divides it has. For example, Na(Sodium) has 11 electrons and it is divided like this: 2,8,1. So it divides into 3 parts so there will 3 shells for sodium.

Hopefully this helps!!

Answer:42 atoms at least

42

Explanation:

1234567912345678912345678912345678

The net result of the proton-proton chain is 4 hydrogens are fused into 1 helium, 2 neutrinos + energy. The answer is B.

The proton-proton chain is a nuclear fusion process that occurs in the sun and other stars to produce energy. The chain involves a series of nuclear reactions that convert hydrogen into helium. The first step in the chain is the fusion of two protons (hydrogen nuclei) to form a deuterium nucleus (one proton and one neutron) with the emission of a positron and a neutrino.

The deuterium nucleus then combines with another proton to form helium-3 (two protons and one neutron) with the emission of a gamma ray. Two helium-3 nuclei then combine to form helium-4 (two protons and two neutrons) with the release of two protons and two neutrinos.

Thus, the net result of the proton-proton chain is the fusion of four hydrogen nuclei into one helium nucleus, along with the release of two neutrinos and a significant amount of energy in the form of gamma rays. This process is responsible for the vast majority of the energy produced by the sun and other stars.

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The pH at 25 °C of a 0.19 M solution of potassium cyanide . note that hydrocyanic acid is a weak acid with pka of 9.21 is 11.2.

The reaction is given as :

KCN  --->  K⁺   +   CN⁻

CN⁻  +  H₂O ⇄ HCN  +  OH⁻

KCN = HCN = 0.19 M

pka(HCN) = 9.21

ka HCN = 6.16 × 10⁻¹⁰

kb CN⁻ = 10⁻¹⁴ - 6.16 × 10⁻¹⁰

           = 1.62 × 10⁻⁵

[HCN] [OH⁻] = X

[CN⁻] = 0.19 M - x

kb = x² / (0.19 M - x )

1.62 × 10⁻⁵ =  x² / (0.19 M - x )

x = [OH⁻] = 0.00174 M

the pOH = - log (0.00174)

     pOH = 2.76

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 2.76

pH = 11.2

Thus, The pH at 25 °C of a 0.19 M solution of potassium cyanide . note that hydrocyanic acid is a weak acid with pka of 9.21 is 11.2.

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The point B is the diagram in which it has the Highest maximum energy level shown Here For the reaction of 2-methylpropene with hydrogen chloride.

The least strong conformation is the eclipsed conformation in which the methyl and the hydrogen atom are gift near every different and enjoy pressure repulsion on every different.

This ends in steric difficulty and makes the molecule unstable.Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula (CH3)2C=CH2. It is a 4-carbon branched alkene (olefin), one of the 4 isomers of butylene.2−methyl propene is greater reactive with HCl than propene as the +I impact of methyl businesses makes double bond greater electron wealthy and for the duration of electrophilic addition, a tertiary carbocation intermediate is received that's greater strong than secondary carbocation intermediate.

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Answer: Point nine six grams per mole which are often just written G / mo L and that's the molar mass or molecular weight for al2o3 aluminum oxide.

Explanation:

The given statement " Unlike covalent bonds, which produce a crystal lattice, ionic bonds are formed between 2 individual atoms, giving rise to true, discrete molecules" is false because Ionic bonds are not formed between two individual atoms.

Ions, which are atoms or molecules that have gained or lost electrons to become charged, come together to form ionic bonds rather than between two separate atoms.

An ionic bond forms a crystal lattice structure rather than a distinct molecule when one ion gives electrons to another ion. On the other hand, covalent bonds often develop between separate atoms that share electrons, leading to the development of distinct molecules.

It's crucial to remember that this generalisation is not always true, as some covalent substances, like silicon and diamond, can also form extended crystal lattice structures.

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Answer:

398 mL

Explanation:

Using the equation for molarity,

C₁V₁ = C₂V₂ where C₁ = concentration before adding water = 8.61 mol/L and V₁ = volume before adding water, C₂ = concentration after adding water = 1.75 mol/L and V₂ = volume after adding water = 500 mL = 0.5 L

V₂ = V₁ + V' where V' = volume of water added.

So, From C₁V₁ = C₂V₂

V₁ =  C₂V₂/C₁

= 1.75 mol/L × 0.5 L ÷ 8.61 mol/L

= 0.875 mol/8.61 mol/L

= 0.102 L

So, V₂ = V₁ + V'

0.5 L = 0.102 L + V'

V' = 0.5 L - 0.102 L

= 0.398 L

= 398 mL

So, we need to add 398 mL of water to the nitric solution.

The scatter plot that shows a positive correlation between force and acceleration.

The acceleration of an object is the change in velocity with time.

Force is defined as an agent which causes a change in the motion or state of rest of a body.

According to Newton's law of motion, the rate of change of velocity of an object is directly proportional to the applied force and takes place in the direction of the applied force.

Force and acceleration have a positive correlation.

Therefore, the scatter plot which will most closely match the measurements that the students will obtain is that which shows a positive correlation between force and acceleration.

In conclusion, acceleration of a object is proportional to the applied force.

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Answer:

C

Explanation:

It starts with one reactant to give and create new compounds as a product. They need a source of energy that can be heat, light, or electricity to break up chemical bonds.

Answer:

The addition of energy in the form of heat or electricity is often required.

Explanation:

A decomposition reaction is a chemical reaction that starts with single reactants to give new compounds as the products. These reaction requires a source of energy that could be light, heat  or electricity to facilitate the breaking-down of the chemical bonds.

Answer:

Chemical properties because if it was physical property then it will glow in dark

Answer:

balenced.

Explanation:

An ecosystem where all organisms have niches and habitats will be balanced.

An ecosystem consists of all the organisms and the physical environment with which they interact.

Niche describes the role an organism plays in a community. A species' niche encompasses both the physical and environmental conditions it requires and the interactions it has with other species.

Habitat is the area and resources used by a particular species.

A balanced ecosystem represents a sustainable habitat of interdependent animals, plants, and microorganisms and their environment.

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In many acid-base reactions, a starting material with a net Positive charge is usually an acid while a starting material with a net Negative charge is often a base.

In many acid-base reactions, a starting material with a net positive charge is usually an acid, while a starting material with a net negative charge is often a base. Acids are substances that can donate protons (H+) and are therefore positively charged when they lose a proton. Bases, on the other hand, can accept protons (H+) and tend to have a net negative charge when they gain a proton. This is based on the concept of proton transfer in acid-base reactions, where the acid donates a proton (positive charge) to the base, resulting in the formation of a new acid and base. It's important to note that not all acids or bases have a net charge, as their acidity or basicity can also be determined by other factors such as electron pair donation or acceptance.

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The balanced half-reactions are given below:

A. Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

Half-reactions refers to either of the two reactions in a redox reaction.

A redox reaction is a reaction in which oxidation and reduction occur simultaneously and to the same extent.

Oxidation reaction involves a loss of electrons while reduction reaction involves a gain of electrons.

The balanced half-reactions are given below:

A. Mo³⁺ (aq) → Mo(s) ( in acidic solution)

This is a reduction reaction:

Mo³⁺ (aq) + 3e⁻ → Mo(s)

B. H₂SO₃ (aq) → SO₄⁻ (aq) (acidic solution)

This is an oxidation reaction

H₂SO₃ (aq) +  H₂O → SO₄⁻ (aq) + 4 H⁺ + e⁻

C. NO₃⁻ (aq) → NO (g) (acidic solution)

This is a reduction reaction

NO₃⁻ (aq) + 4 H⁺ + 2e⁻ → NO (g) + 2 H₂O

D. O₂ (g) → H₂O (l) (acidic solution

This is a reduction reaction

O₂ (g) + 4H⁺ +  4 e⁻ → 2 H₂O (l)

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This means that for every one magnesium atom (Mg), you need two molecules of hydrochloric acid (HCl) to balance the equation. Therefore, the answer is (b) 2 HCl molecules.

The balanced chemical equation for the reaction between Mg and HCl is:

Mg + 2HCl ---> \(MgCl_{2}\) +  \(H_{2}\)

1. Identify the number of atoms of each element on both sides of the equation.
2. Add coefficients to balance the number of atoms of each element.

1. The number of atoms of each element in the unbalanced equation:
  Mg: 1 (left side) and 1 (right side)
  H: 0 (left side) and 2 (right side)
  Cl: 1 (left side) and 2 (right side)

2. Balance the atoms:
  To balance the Cl atoms, add a coefficient of 2 in front of HCl on the left side:
  Mg + 2HCl --->  \(MgCl_{2}\) + \(H_{2}\)
  Now the number of H atoms is also balanced, with 4 H atoms on each side.

So, you need 2 HCl molecules to balance the equation. The correct answer is b. 2.

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Answer:

The protons and electrons of an atom are attracted to each other. They both carry an electrical charge. Protons have a positive charge (+) and electrons have a negative charge (-). The positive charge of the protons is equal to the negative charge of the electrons.

Explanation:

Answer:

NA = 6.02214076×10^23 mol−1.

Explanation:

1 mole of helium gas contains 6.02 x10^23 helium atoms. So multiply this by 3 after solving the equation.

There are 1.8066 x 10 ^24 atoms in 3 moles of helium

1 mole of any substance is equal to 6.022 × 1023 atoms , This is called the  Avogadro's Number and it represents 12 grams of pure carbon.

Hence,

I mole of Helium = 6.022 × 1023 atoms

Therefore,  

3 moles of helium will be 3 x   6.022 × 1023 atoms

3 moles of helium =1.8066 x 10 ^24 atoms

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There are several types of solutions, including dilute solutions, concentrated solutions, saturated solutions, unsaturated solutions, and supersaturated solutions. Each type of solution has specific characteristics that distinguish them from one another.

Dilute solutions: These solutions have a small amount of solute dissolved in a larger amount of solvent. They have a low concentration of solute particles. Concentrated solutions: Concentrated solutions have a large amount of solute dissolved in a smaller amount of solvent. They have a high concentration of solute particles. Saturated solutions: Saturated solutions contain the maximum amount of solute that can dissolve in a given amount of solvent at a particular temperature. Any additional solute added will not dissolve. Unsaturated solutions: Unsaturated solutions have not reached their maximum solute capacity and can dissolve more solute. Supersaturated solutions: These solutions contain more solute than what is normally possible at a given temperature. They are achieved by dissolving the solute at a higher temperature and then cooling the solution slowly.

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The option that is not a known advantage of natural gas over other fossil fuels is: C. It is far more abundant than any other fossil fuel.

Natural gas has several advantages over other fossil fuels. Firstly, it burns more completely than other fossil fuels, which means it produces fewer pollutants and greenhouse gases.

This leads to the second advantage, as natural gas burns more cleanly than other fossil fuels, resulting in reduced emissions of pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter.

However, when it comes to abundance, natural gas is not necessarily more abundant than other fossil fuels.

While natural gas reserves can be substantial, the availability and reserves of other fossil fuels like coal and oil are also significant. Therefore, option C is not a known advantage of natural gas over other fossil fuels.

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The molecule cis-1,2-dibromocyclopentane comes under Stereoisomers.

Stereoisomers are molecules that have the same molecular formula, the same atom connectivity, but they differ in the relative spatial orientation of the atoms.

In cis-1,2-dibromocyclopentane, both bromine atoms are on the same "face" of the cyclopentane ring.

1/4  temperature must give Mass of nitrogen at 0°c heated so that both it volume and pressure will be double.​

To double both the volume and pressure of a given mass of nitrogen at 0°C, we can utilize the combined gas law, which relates the initial and final states of a gas. The combined gas law is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where P1 and P2 are the initial and final pressures, V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.

Since we want to double both the volume and pressure, we can set P2 = 2P1 and V2 = 2V1. Plugging these values into the combined gas law equation, we get:

(2P1 * 2V1) / T1 = P1 * V1 / T2

Simplifying the equation, we find:

4P1V1 = P1V1 / T2

Cancelling out the common terms, we have:

4 = 1 / T2

Rearranging the equation, we find:

T2 = 1 / 4

Therefore, to double both the volume and pressure of the given mass of nitrogen at 0°C, it must be heated to a temperature of 1/4 or 0.25 times its initial temperature.

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The most likely cause of a high incidence of covalent bonds between thymine and other nucleotides in the DNA of skin cells of a patient is exposure to ultraviolet radiation.

Nucleotides are the basic molecules that are found in the DNA and RNA molecules.

The nucleotides are linked to each by means of phosphodiester bonds.

The nucleotides that are found in the nucleic acids are given below:

Mutations occur in these nucleotides when they are exposed to chemicals as well as ionizing radiation. Also, exposure to ultraviolet radiation affects the structure of the nucleotides.

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The pair of elements which are non-metals and at the same time; gases at room temperature and normal atmospheric pressure are as follows:

N2, O2, He, Ar

An element is a substance which cannot be split into simpler units by any ordinary process.

Some few examples of elements include:

Hydrogen

Helium

Lithium

Beryllium

Boron

Carbon

Nitrogen

Oxygen

Fluorine

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