In a chemical change

Answer:

compaction and cementation

I love science by the way

Answer:

compaction and cementation

Explanation:

hope it helps <3

The molar solubility of sodium stearate in pure water is 0.00163 mol/L, and the solubility is 0.5 g/L.

To calculate the molar solubility and solubility of sodium stearate (C17H35COONA) in pure water, we need to consider the balanced equation for its dissolution and use the given molecular formula and molar mass.

First, let's write the balanced equation for the dissolution of sodium stearate in water:

C17H35COONA(s) ⇌ C17H35COO−(aq) + Na+(aq)

The molar solubility is defined as the number of moles of solute (sodium stearate) that dissolve per liter of solvent (water). To calculate it, we need to determine the concentration of the sodium stearate ions in the saturated solution.

The molecular formula of sodium stearate (C17H35COONA) indicates that for every molecule that dissolves, one C17H35COO− ion and one Na+ ion are produced. Therefore, the concentration of both ions will be the same in the saturated solution.

To find the molar solubility, we need to calculate the concentration of either the C17H35COO− ion or the Na+ ion. Let's use the C17H35COO− ion.

The molar mass of sodium stearate (C17H35COONA) is 306.44 g/mol.

Now, we can calculate the molar solubility:
Molar solubility = (mass of sodium stearate / molar mass of sodium stearate) / volume of water

Since we are working with pure water, the volume is 1 liter (1000 mL).

To find the solubility in grams per liter (g/L), we multiply the molar solubility by the molar mass of sodium stearate.

Example calculation:
If the mass of sodium stearate dissolved is 0.5 grams, the molar solubility would be:
Molar solubility = (0.5 g / 306.44 g/mol) / 1 L = 0.00163 mol/L
Solubility = 0.00163 mol/L * 306.44 g/mol = 0.5 g/L

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They affect food webs through energy production and agriculture, pollution, habitat destruction, over fishing and hunting.

All the food networks in a single ecosystem make up a food web. Each organism in an ecosystem is a link in a number of food chains. Energy and nutrients can go along different food chains as they move through the ecosystem.

Who eats whom in the wild is described by the food chain. Everything that is alive, from microscopic algae to enormous blue whales, depends on food to thrive. Each food web represents a possible route for nutrients and energy to travel through the ecosystem.

The majority of consumers are people. Energy production, agriculture, pollution, habitat degradation, overfishing, and hunting all have an impact on food webs. Along with population increase, their needs for food and shelter also have an impact on the ecosystems of the land and the sea.

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The sequence of events at the neuromuscular junction is: 1. Arrival of the action potential at the synaptic knob, 2. Release of ACh into the synaptic cleft, 3.Binding of ACh to ACh receptors in the motor end plate, 4.Generation of action potential in sarcolemma, 5.Removal of ACh from the cleft by acetylcholinesterase

The action potential travels down the axon of the motor neuron and reaches the synaptic knob. This causes the release of the neurotransmitter acetylcholine (ACh) into the synaptic cleft. The ACh binds to ACh receptors in the motor end plate of the muscle fiber, which leads to the generation of an action potential in the sarcolemma (muscle cell membrane). The action potential then travels along the sarcolemma and deep into the muscle fiber, causing muscle contraction. Finally, the ACh in the synaptic cleft is rapidly broken down by the enzyme acetylcholinesterase to prevent continuous muscle contraction.

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For producing 639L of \(SF_6\), a volume of 1916.96L of \(F_2\) gas is required for the reaction.

If the pressure and temperature at which the reaction occurs is known, we may use the ideal gas law to compute the stoichiometry of processes involving gases by using the connection between the volume (in liters) and quantity of gases (in moles). A chemical reaction's volume of gas can be evaluated by collecting it in an inverted vessel filled with water. The gas pushes water out of the vessel, and the amount of liquid displaced is proportional to the amount or volume of gas.

Given:

Volume of \(SF_6\) = 639L

Pressure, P = 2atm

Temperature, T = 273.15K

To find:

Volume, V of \(F_2\) gas = ?

Formula:

PV = nRT

Calculations:

No. of moles of \(SF_6\) = 2 x 639 / 0.082 x 273.15

No. of moles of \(SF_6\) = 57.057 moles

\(S (s) + 3F_2 (g) \rightarrow SF_6 (g)\)

From the reaction,

1 mole of \(SF_6\) is formed from 3 moles of \(F_2\)

Therefore,

No. of moles of \(F_2\) = 3 x 57.057 = 171.171 moles

Volume of \(F_2\) = 171.171 x 0.082 x 273.15 / 2

Volume of \(F_2\) = 1916.96L

Result:

1916.96L of \(F_2\) gas is required to produce 639L of \(SF_6\).

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The MW of the block copolymer you prepared is 0.2 kg/mol.

To calculate the molecular weight (MW) of the block copolymer you prepared, you need to use the mole ratios determined from your 1H NMR data. The table above should contain the required information to perform this calculation.
The formula to calculate the MW of a copolymer is:
MW = Σ (ni x Mi)
Where ni is the mole fraction of each repeating unit and Mi is the molecular weight of each repeating unit.
First, determine the mole fractions of each repeating unit from the 1H NMR data. For example, if the mole fraction of the first repeating unit is 0.3 and its molecular weight is 100 g/mol, and the mole fraction of the second repeating unit is 0.7 and its molecular weight is 200 g/mol, the MW of the block copolymer would be:
MW = (0.3 x 100 g/mol) + (0.7 x 200 g/mol)
MW = 60 g/mol + 140 g/mol
MW = 200 g/mol
To convert this to kg/mol, simply divide by 1000:
MW = 200 g/mol ÷ 1000
MW = 0.2 kg/mol
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Exothermic type of reaction is taking place because this type of reaction generates heat energy.

Exothermic reactions refer to those chemical reactions that produce heat energy and release that heat energy to the surrounding environment.

So we can conclude that exothermic type of reaction is taking place because this type of reaction generates heat energy.

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Noble gases are exceedingly stable and unlikely to form chemical connections since they have minimal inclination to receive or lose electrons, thanks to the complete valence electron shells of these atoms.

Any one of the seven chemical elements that compose Group 18 (VIIa) of the periodic table is referred to as a noble gas. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson are the constituent elements (Og). The noble gases are inflammable, tasteless, colorless, and odorless. The term "noble" has long been used in science and alchemy to describe how resistant metals like gold and platinum are to chemical reactions. As their atomic numbers rise, the abundances of the noble gases fall.

German chemist Friedrich E. Dorn discovered radon for the first time in 1900, and in 1904 it was recognized as a member of the noble-gas family. In 1904, the work of Rayleigh and Ramsay was recognized with Nobel Prizes.

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\(C_{(s)}+H_{2}_{(s)} +O_{2_{(g)} }\)  ⇒  \(C_{12} H_{22} O_{11_{(s)} } +H_{2_{(g)} } +O_{2_{(g)} }\).

Dehydrating -hydrate in a vacuum of 6–80 mm Hg at temperatures between 100–190 °C and crystallizing it with a suitable solvent, particularly dry methanol or 95% pure ethanol, yields a stable form of -lactose.

The disaccharide sugar lactose, with the chemical formula C12H22O11, is produced by the combination of the galactose and glucose subunits. In milk, lactose makes up between 2-8%. (by mass). The disaccharide lactose is a beta-D-galactose coupled to an alpha-D-glucose that is present in milk. These two sugars are connected by a beta-1,4-glycosidic bond.

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The most effective method of for increasing the rate of evaporation Only so much water vapour can be contained in air. You will ultimately hit the condensation point if you keep adding more. The airborne water vapour transforms back into liquid at this point.

The temperature of the air affects this location. In comparison to cooler air, warmer air will store more water vapour. Therefore, warm air above the water would be helpful if you wanted to speed up evaporation.Simply put, we refer to the water vapour in the air as humidity. The percentage of water vapour in the air over the air's maximal vapor-holding capacity is known as relative humidity. As a result, if the air is only carrying half of the water vapour.

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Answer:

Sorry, i also don't know the answer to this.

Galaxies are the lump of matter. The shape of major galaxies is spiral shape. Thus, the given statement is false.

The galaxies are the lump of dust and mass, held together by the gravitational force. The galaxies are continuously moving in the universe.

The formation of galaxies is believed to be due to the force of attraction between the components.

The shape of major galaxies is assumed to be spiral-shaped, however, the irregular shape galaxies are also present.

Thus, the given statement about the shape of galaxies is false.

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The relative rates of solvolysis via an SN1 mechanism are determined by both the stability of the carbocation intermediate and the nature of the leaving group.

The relative rates of solvolysis through an SN1 mechanism are primarily determined by the stability of the intermediate carbocation formed during the reaction. More stable carbocations are formed more easily, which results in faster reaction rates.

In general, tertiary alkyl halides form more stable carbocations compared to secondary or primary alkyl halides. This is due to the increased number of alkyl groups attached to the carbon bearing the leaving group.

The electron-donating effect of these groups leads to greater positive charge delocalization, which stabilizes the carbocation intermediate.

Therefore, tertiary alkyl halides will generally have the fastest rates of solvolysis via an SN1 mechanism, followed by secondary and primary alkyl halides. This trend is consistent with experimental data.

Additionally, the nature of the leaving group also plays a role in the rate of solvolysis. Leaving groups that are better able to stabilize negative charge, such as iodide, tend to promote faster reaction rates compared to leaving groups that are weaker in this regard, such as bromide or chloride.

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There is one Lewis dot in lithium, representing the one valence electron in the outermost shell of the atom.

Lithium is a compound component with nuclear number 3 and image Li. In the Lewis speck design of lithium, the image Li is encircled by a solitary dab, which addresses the one valence electron of the lithium iota. This electron is situated in the peripheral shell of the particle, otherwise called the valence shell, which is the shell that takes part in substance holding. The Lewis dab design of lithium demonstrates that there is just a single valence electron in the iota. The peripheral shell of lithium can oblige up to eight electrons, however lithium will in general lose its valence electron to shape a steady cation with a positive charge of +1.

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Answer:

Friction

Explanation:

Answer:

a . knowledge and existing theories .

b. falsifiable scope

Answer: 0.37 M

Explanation:

\(M_{A}V_{A}=M_{B}V_{B}\\(20.4)(0.650)=M_{B}(36)\\M_{B}=\frac{(20.4)(0.650)}{36}=\boxed{0.37 \text{ M}}\)

Answer:

Point A

Explanation:

The Northern Hemisphere is furthest away from the sun in position A. Therefore the sunlight takes longer to reach the Earth which results in the Northern Hemisphere experiencing winter.

Point A represents the position where the northern hemisphere is experiencing winter.

This is because Earth's axis is tilted away from the sun at this point, causing the northern hemisphere to receive less direct sunlight and shorter days. As a result, the rays from the sun are spread over a larger area, making the sunlight less intense and leading to colder temperatures during this time of the year in the northern hemisphere.

In contrast, at Point C, the northern hemisphere experiences summer. This is when the Earth's axis is tilted towards the sun, causing the northern hemisphere to receive more direct sunlight and longer days, resulting in warmer temperatures.

Points B and D are the equinox positions when the sun shines evenly on Earth from pole to pole, and both hemispheres experience approximately equal day and night lengths. These are the times of the year when transitions between seasons occur.

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Answer:

4.9 × 10²³ molecules

Explanation:

Given data:

Number of molecules = ?

Number of moles of oxygen = 0.815 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.815 mol  ×  6.022 × 10²³ molecules  / 1 mol

4.9 × 10²³ molecules

Answer:

The color of the solution turned a clear brown sort of a copper color

Explanation:

The color of the solution turned a clear brown sort of a copper color.

This is because ASA and the FeCl3 are reacting in a manner that it is resulting in the creation of a metal.

Answer:

129 units cubed

Explanation:

There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.

Hopefully this was helpful! :)

Answer:

13.57 approximately 14

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

From the question

mass of alcohol = 100 g

density = 0.79 g/mL

The volume is

\(volume = \frac{100}{0.79} \\ = 126.58227848...\)

We have the final answer as

Hope this helps you

Answer:

There are many effects of radiation to the human body. (if you watch the 100, you'll see what happens)

Exposure to very high levels of radiation, such as being close to an atomic blast, can cause acute health effects such as

1. weakness

a/ fatigue,

b/ fainting,

c/ confusion.

2.Bleeding from the nose,

a/ mouth,

b/ gums,

c/ rectum

3. Bruising,

a/ skin burns,

b/ open sores on the skin,

c/ sloughing of skin.

4. Dehydration.

5. Diarrhea, bloody stool.

6. Fever.

7. Hair loss.

8. Inflammation of ex

Answer:

b, and d

Explanation:

because it makes the most sense I might be wrong

According to Laplace's law lungs should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.

According to this law of Laplace, if the radius of the blood vessel is larger than the wall tension required will be larger in order to withstand or overcome the pressure which is exerted by internal fluids or gases.

The alveoli are to remain inflated as the gaseous pressure which is developed inside the alveoli is greater than the pressure of atmosphere.

When the blood vessel thickens or its thickness increases, it will result in the reduction of the tension developed by the gas at a given constant pressure.

It was published in a research paper that according to law of Laplace, lung should remain inflated because air pressure in alveoli is more than the pressure of the atmosphere.

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Answer: Ammonia, an alkaline chemical, is used to raise the pH level (it's levels of acidity) of our hair during the colouring process. This then lifts the cuticles of the hair fibre and allows the colour to be deposited onto the cortex (the inner part of the hair protected by the cuticles). In hair coloring products, ammonium hydroxide is used to support the lightening action of hydrogen peroxide and to prepare hair to accept color pigments. Alkaline properties of ammonia raise the cuticle and allow peroxide and dye molecules to penetrate the hair shaft. (creds to the internet)

Explanation: Hope this helps! :D

Answer:

77.6 g of Fe will be produced

Explanation:

The balanced chemical equation is 2Fe2O3 + 3C → 4Fe + 3CO2. We have 25.0 g of carbon present in the reaction. To calculate the mass of Fe produced, we can use stoichiometry.

First, we need to convert the mass of carbon to moles:

25.0 g C × (1 mol C / 12.01 g C) = 2.08 mol C

Next, we can use the mole ratio between carbon and iron to calculate the moles of iron produced:

2Fe2O3 + 3C → 4Fe + 3CO2

(2 mol Fe / 3 mol C) × (2.08 mol C) = 1.39 mol Fe

Finally, we can convert the moles of iron produced to grams:

1.39 mol Fe × (55.85 g Fe / 1 mol Fe) = 77.6 g Fe

Therefore, 77.6 g of Fe will be produced.

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