why are halogens found in nature only in compounds?

Answer:

select all of them except they are the biggest

The predators have good hearing, keen eyesight, and also have special adaptations that help them to be successful hunters. The correct options are A, B, and D.

A predator is an organism that consumes all or part of the body of its prey, which is another living or recently killed organism.

"Living or recently killed" distinguishes predators from decomposers, such as fungi and bacteria, which break down the remains of dead organisms.

Predation is classified into four types: carnivory, herbivory, parasitism, and mutualism. Each type of predation can be classified based on whether or not the prey is killed.

Prey animals are prey animals that are killed and eaten by other animals. For instance, Rabbits and crickets are both prey for larger animals.

The predators have excellent hearing and vision, as well as special adaptations that allow them to be successful hunters.

Thus, the correct options are A, B, and D.

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The common intermolecular forces involved between dye molecules and fabric fibers include dipole-dipole interactions, London forces, and hydrogen bonding.

The fibers that are mentioned in the test fabric are bamboo, wool, linen, cotton, nitrile, silk, polyester, Tencel, acetate, nylon, rayon, and acrylic. However, it is not specified which fibers are being analyzed for the intermolecular forces.

Intermolecular forces are the forces of attraction or repulsion that occur between molecules. These forces determine many of the physical properties of materials, including their melting and boiling points, viscosity, and solubility. When dyes are applied to fabric, the intermolecular forces between the dye molecules and the fabric fibers play a critical role in determining how well the dye adheres to the fibers and how well it resists fading.

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According to the given statement 1.96 L  is the new volume assuming temperature is constant.

An volume of a gas is just one where there were no intermolecular attraction forces and all collisions involving atoms or molecules are entirely elastic. It can be seen as a group of perfectly spherical particles that collide but do not otherwise interact with one another.

Initial pressure (P₁): 0.98 atm

Initial volume (V₁): 1.0 L

Final pressure (P₂): 0.50 atm

Final volume (V₂): ?

Boyle's law provides an expression for this for an ideal gas that experiences an isothermal change.

P₁×V₁ = P₂×V₂

V₂ = P₁×V₁ / P₂

V₂ = 0.98 atm * 1.0 l / 0.50 atm

V₂ = 1.96 L

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Answer:

6.Crust

7. outer core

8.mantle

no...the atoms will not behave the same

as when temperature is increased, the atoms vibration and kinetic energy will also be increased....they come in excited state...

where as when temperature is reduced ,atoms kinetic energy slows down....

Some NaNO₃ may not fully dissociate when dissolved in a solution due to factors such as limited solubility, presence of other ions, and temperature.

The dissociation of NaNO₃ in solution depends on its solubility and the conditions of the solution. NaNO₃ is generally highly soluble in water, meaning that it readily dissociates into Na+ and NO3- ions. However, there are instances where not all of the NaNO₃ will dissociate completely.

One factor that can limit the dissociation of NaNO₃ is its solubility. If the concentration of NaNO₃ in the solution exceeds its maximum solubility, a portion of the NaNO₃ may remain undissolved and not dissociate into ions dissolution.

Additionally, the presence of other ions in the solution can affect the dissociation of NaNO₃. Common ions in the solution, such as H+, OH-, or other cations and anions, can interact with the Na+ and NO₃- ions, forming compounds that are less soluble or stable. This can reduce the overall dissociation of NaNO₃.

Temperature can also play a role in the dissociation of NaNO₃. Higher temperatures generally increase the solubility and dissociation of salts, including NaNO₃. However, at lower temperatures, the solubility and dissociation may be reduced.

In conclusion, limited solubility, presence of other ions, and temperature are factors that can affect the complete dissociation of NaNO₃ in a solution, leading to some of the NaNO₃ remaining undissociated.

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A laboratory report is an important part of the scientific process that communicate the important work that has been done.

Your information is incomplete. Therefore, an overview of a laboratory report will be given. The laboratory report is important for future studies a d experiments.

A laboratory report is broken down intosections such as title, abstract, introduction, methods, materials, results, discussion conclusion, and references.

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Two ways to tell that the steel wool in the video underwent a chemical reaction are the production of heat and the change in color of the steel wool.

The production of heat during a chemical reaction is a result of the energy released or absorbed during the chemical reaction. The heat generated during the chemical reaction with steel wool can be observed as the steel wool becomes hot to the touch.

Additionally, chemical reactions often result in a change in the color of the reactants or products, as the steel wool changes from its original silver color to a black color due to the formation of new compounds. This change in color is an indicator that a chemical reaction has occurred.

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Answer:

Explanation:

A perfect diamond is a single molecule made of carbon atoms.

DNA is a super long molecule that has information uniquely describing every human being.

When two or more atoms chemically bond together, they form a molecule.

They are very small in size.

They have space between them.

They are in constant random motion.

molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

Molecules can exist in free state because they are very stable.

The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.

The rank of ethanol, 2-butanol, and methyl linoleate from highest to lowest logKow value is: 2-butanol > ethanol > methanol > methyl linoleate.

Log Kow is a logarithmic value that indicates the level of water solubility of organic compounds. It is a measure of the partition coefficient of a compound between water and octanol. The higher the logKow value of a compound, the more hydrophobic it is (and less water-soluble). The lower the value of logKow of a compound, the more hydrophilic it is (and more water-soluble).

Therefore, the ranking based on structure/polarity of methanol, ethanol, 2-butanol, and methyl linoleate from highest to lowest logKow value is:

2-butanol > ethanol > methanol > methyl linoleate.

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Answer:

I. Luke has 81 postcards.

II. Brian has 54 postcards.

Explanation:

Let Luke's collection be L

Let Brian's collection be B

Translating the word problem into an algebraic equation, we have;

L = 27 + B

L + B = 135

Substituting equation 1 into equation 2, we have;

27 + B + B = 135

27 + 2B = 135

2B = 135 - 27

2B = 108

B = 108/2

B = 54

Therefore, Brian has 54 postcards.

To find the value of L;

L = 27 + B

L = 27 + 54

L = 81

Therefore, Luke has 81 postcards

Answer:

Explanation:

Instrument used to measure wind speed are known as anemometer and can record wind speed, direction, and strength. The normal unit of wind speed is knots (nautical miles per hour)

Therefore, at -47°C, the Cl-catalyzed reaction proceeds approximately 1.0052 times faster compared to the reaction catalyzed by nitrogen monoxide.

To determine the ratio of the rate constant for the Cl-catalyzed reaction to the reaction catalyzed by nitrogen monoxide, we need to compare their respective rate constants at -47°C.

Given:

Activation energy for the Cl-catalyzed reaction (Ea1) = 2.1 kJ/mol

Activation energy for the NO-catalyzed reaction (Ea2) = 11.9 kJ/mol

Temperature (T) = -47°C

We can use the Arrhenius equation to relate the rate constant (k) to the activation energy and temperature:

k = A ×exp(-Ea / (RT))

Since the frequency factor (A) is assumed to be the same for both reactions, we can simplify the equation:

k1 / k2 = exp((Ea2 - Ea1) / (RT))

Substituting the given values:

Ea1 = 2.1 kJ/mol

Ea2 = 11.9 kJ/mol

T = -47°C = 226 K

k1 / k2 = exp((11.9 - 2.1) / (8.314 J/mol·K × 226 K))

k1 / k2 = exp(9.8 / (1874 J/mol))

k1 / k2 = exp(0.0052)

k1 / k2 ≈ 1.0052

Therefore, at -47°C, the Cl-catalyzed reaction proceeds approximately 1.0052 times faster compared to the reaction catalyzed by nitrogen monoxide.

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Answer:

It's temperature drops, and if releases thermal energy

Answer:

Its temperature drops

Answer:

D. Physical weathering

Explanation:

Since the rocks are not changing their composition unlike the chemical one cause it changes their composition and weakens them too

Answer:

40.72g of sulfuric acid are needed

Explanation:

When sulfuric acid, H₂SO₄, is neutralized by lead (IV) hydroxide, Pb(OH)₄, Lead (IV) sulfate, Pb(SO₄)₂ and water as follows:

2 H₂SO₄ + Pb(OH)₄ → Pb(SO₄)₂ + 4H₂O

To solve this question we must find the moles of 57.18g of Pb(SO₄)₂. As 2 moles of H₂SO₄ produce 1mol Pb(SO₄)₂ we can find the moles of H₂SO₄ and its mass as follows:

Moles Pb(SO₄)₂ -Molar mass: 275.23 g/mol-

57.18g * (1mol / 275.23g) = 0.2078 moles Pb(SO₄)₂

Moles H₂SO₄:

0.2078 moles Pb(SO₄)₂ * (2mol H₂SO₄ / 1mol Pb(SO₄)₂) = 0.4155 moles H₂SO₄

Mass H₂SO₄ -Molar mass: 98g/mol-

0.4155 moles H₂SO₄ * (98g / mol) =

The given statement, "If a mineral fizzes when it comes into contact with acetic acid, it is probably composed of calcium carbonate (CaCO₃)" is true because When a mineral fizzes upon contact with acetic acid, it is a strong indication that the mineral is composed of calcium carbonate (CaCO₃).

The fizzing occurs due to the release of carbon dioxide gas (CO₂) during a chemical reaction between the acid and the carbonate compound. Calcium carbonate is a common mineral found in various forms such as limestone, marble, and chalk. It is insoluble in water but reacts readily with acids, including acetic acid, which is the main component of vinegar.

The reaction between calcium carbonate and acetic acid can be represented by the following equation:

CaCO₃ + 2CH₃COOH → Ca(CH₃COO)₂ + H₂O + CO₂

In this reaction, calcium carbonate reacts with acetic acid to form calcium acetate, water, and carbon dioxide gas. The release of carbon dioxide gas is responsible for the fizzing observed when the mineral comes into contact with the acid.

Therefore, if a mineral fizzes when it encounters acetic acid, it is likely composed of calcium carbonate (CaCO₃). This fizzing reaction is often used as a simple and effective test to identify the presence of calcium carbonate in minerals or rocks.

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The liquid iron flows in a spiral pattern and creates a bipolar magnetic field does the iron in the outer core, spiral because liquid iron has a natural spin that causes the helical spiral pattern. Thus, option (B) is correct.

Helical flow is the cork-screw-like flow of water in a meander. It is one example of a secondary flow. Helical flow is a contributing factor to the formation of slip-off slopes and river cliffs in a meandering section of the river.

Meanders start when friction with the channel bed and banks causes turbulence in the water flow. This results in a spiraling flow of water called helical flow- a corkscrew-like movement of the water as it spirals downstream from bank to bank. Thus, option (b) is correct.

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The boiling point of the solution in water is 100.128 °C.

The boiling point of a solution can be calculated using the formula:

ΔTb = Kb x molality

Where ΔTb is the change in boiling point, Kb is the boiling point elevation constant for the solvent, and molality is the concentration of solute in the solution.

The molality of the solution can be calculated as follows:

molality = (mass of solute) / (mass of solvent + mass of solute)

For a 25% solution of ethylene glycol, the molality is:

molality = (0.25 x mass of solution) / (mass of solution)

= 0.25 x (mass of ethylene glycol) / (mass of water + mass of ethylene glycol)

The change in boiling point can then be calculated as:

ΔTb = Kb x molality

= 0.512 x 0.25

= 0.128 °C

So the boiling point of the solution is:

Boiling point = normal boiling point of water + ΔTb

= 100 °C + 0.128 °C

= 100.128 °C

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Answer:

Wont show pic sorry

Explanation:

If you can get the pic to work i could solve it for you

Answer:

HR

Explanation:

HR stands for hour

In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the cathode; the chemical change that occurs at this electrode is called reduction.

An electrolyte is a material that separates into charged ions when it is in contact with water. Cations are positively charged ions. Anions are ions that are negatively charged. A substance that may conduct an electric current when melted or dissolved in water is known as an electrolyte.

There are three main categories of electrochemical cells. the galvanic cell, the concentration cell, and the electrolytic cell. These cells all share the same four fundamental components. These are the elements

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All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

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Answer:

500

Explanation:

Answer:

Molecular formula = C₆H₄Cl₂

Explanation:

Given data:

Percentage of hydrogen = 2.7%

Percentage of carbon = 49%

Percentage of chlorine = 48.2%

Molar mass of compound = 150 g/mol

Molecular formula = ?

Solution:

Number of gram atoms of H = 2.7 / 1.01 = 2.67

Number of gram atoms of Cl = 48.2 / 16 = 1.36

Number of gram atoms of C = 49 / 12 = 4.08

Atomic ratio:

            C                      :           H             :           Cl

           4.08/ 1.36         :     2.67/1.36       :       1.36/1.36

            3                      :        2                 :        1

C : H : Cl = 3 : 2 : 1

Empirical formula is C₃H₂Cl.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = 12×3 + 1.01 ×2 + 35.5 = 73.52 g/mol

n = 150 / 73.52

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₃H₂Cl)

Molecular formula = C₆H₄Cl₂

Answer:When a jar of coffee is opened, then people in all parts of room notice smell.

Explanation: Due to the process of diffusion.

Answer:

78 pairs of chromosomes

Explanation:

Based on the symptoms described, Rishi most likely suffers from an anxiety disorder.

The symptoms experienced by Rishi, such as feeling apprehensive, fearful, rapid heartbeat, icy hands, and sweating, are indicative of a panic attack, which is a hallmark feature of panic disorder. Panic disorder is an anxiety disorder characterized by recurrent and unexpected panic attacks.

Panic attacks are intense episodes of fear and discomfort that typically peak within minutes. They can occur suddenly and without any apparent trigger, causing physical symptoms such as a pounding heart, shortness of breath, trembling, sweating, and a sense of impending doom. These symptoms can be extremely distressing and may lead to a fear of having future panic attacks, resulting in anticipatory anxiety.

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Answer:

Boron

Explanation:

Hope that helps

Answer:

Boron.

Explanation:

2 energy shells

1st energy she'll 2 electrons

2nd energy shell 3 electrons

9. In terms of Material Sustainability Attribute HPD gives information about a product's content, any potential health hazards associated with the product, and the safe handling and disposal of the product.

10. In terms of sustainability, VOC gives information about chemicals emitted by building materials and finishes that can cause negative health effects for people and contribute to air pollution.

11. Single attribute product sustainability attributes are assessed for particular issues such as emission of VOCs, thermal performance, and energy performance. Thus, option E. (a, b, c) is correct.

12. International Green Construction Code is developed by ICC (International Code Council) in response: all of the above is the correct answer (Option E).

13. The statement "lumber applies to wood products derived directly from logs through sawing and planning operations with no other manufacturing except cutting to length" is true.

14. The statement "the terms lumber, solid lumber, solid sawn lumber, and sawn lumber are synonymous" is true.

15. Wood is known for its high strength-per-weight ratio as compared to other structural materials. (Option B).

16. The statement "Wood is much stronger by weight than concrete" is false because wood is less strong by weight than concrete.

17. The statement "Concentric annual rings are visible in the vertical section of a tree and provide a good estimation of the age of the tree" is true.

HPD stands for Health Product Declaration. In terms of Material Sustainability Attribute HPD gives information about a product's content, any potential health hazards associated with the product, and the safe handling and disposal of the product. VOC stands for Volatile Organic Compounds. In terms of sustainability, VOC gives information about chemicals emitted by building materials and finishes that can cause negative health effects for people and contribute to air pollution.

International Green Construction Code is developed by ICC (International Code Council) in response to demand and initiatives such as LEED. It is a baseline code as opposed to a multi-tiered rating system. It applies primarily to non-residential buildings. It is newly developed and not yet widely adopted and has some conflicts with the LEED certification process.

Thus, the correct answer is

11. E

12. E

13. True

14. True

15. B

16. False

17. True

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A(n) cytokine is any soluble, low molecular-weight protein or glycoprotein released by one population of cells that acts as an intercellular communication/signaling molecule on a different group of cells.

Small, flexible proteins known as cytokines play a crucial role in cell signaling. Peptides like cytokines may be unable to penetrate the lipid bilayer of cells to reach the cytoplasm. As immunomodulating agents, cytokines have just been demonstrated to participate in autocrine, and paracrine, including endocrine signaling.

Small proteins called cytokines play a key role in regulating the development and activity of blood and immune system cells. They instruct the immune response to function once they are released. All blood cells as well as other cells that support the body's immunological and inflammatory responses are affected by cytokines.

Therefore, A(n) cytokine is any soluble, low molecular-weight protein or glycoprotein released by one population of cells that acts as an intercellular communication/signaling molecule on a different group of cells.

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