HELP! PLZZ! NEED THIS DONE ASAP!

Answer:

I don't know the answer but I do really like your profile picture, it's cool. He is my favorite character from Demon Slayer

Answer:

false false false false

a net ionic equation to show why solid potassium hydroxide, koH (s), forms a basic solution when it dissolves in water

Equation

KOH (s) [H2O ] →     K+(aq)+OH−(aq)

The Arrhenius theory, the Brnsted-Lowry theory, and the Lewis theory are the three ideas that have contributed to the definitions of acids and bases over time. According to Arrhenius, an acid is a chemical that, when ionised, releases protons (hydrogen ions) into the solution, whereas a base releases hydroxide ions.

According to Brnsted-Lowry, a base is a proton acceptor and an acid is a proton giver. According to Lewis, a base is an electron-pair donor, while an acid is an electron-pair acceptor

KOH satisfies the Arrhenius theory's definition of a base by producing hydroxide ions when ionised. The hydroxide ion is the base component from a Brnsted-Lowry perspective since it can accept a proton to create water. Although it is a little more difficult to understand from a Lewis perspective why this is a base, the oxygen in the hydroxide has three pairs of non-bonding electrons on it. When a proton (acid) is present, it lacks the electrons necessary to create a covalent link, therefore hydroxide donates an electron pair to the proton in order to build a coordinate covalent bond, which produces water. The three theoretical requirements for a base are thus satisfied by the aforementioned net ionic equation.

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Answer:

It must be large

Random

Explanation:

For a sample to represent a population accurately, it must be large and contain random sample spaces.

A population is a group of organism of the same species living in a particular place where they can reproduce.

The correct answer is (a) ne < f2 < nai. Solubility refers to the ability of a substance (solvent) to dissolve another substance (solute) to form a homogenous mixture.

The correct answer is (a) ne < f2 < nai. Solubility refers to the ability of a substance (solvent) to dissolve another substance (solute) to form a homogenous mixture. In this case, water is the solvent and ne, f2, and nai are the solutes. When comparing the solubility of these substances in water, we need to consider their molecular structure and polarity. Ne (neon) is a noble gas that exists as a monoatomic molecule, meaning it has no polarity and cannot form hydrogen bonds with water molecules, making it the least soluble among the three. F2 (fluorine) is a diatomic molecule that is highly electronegative and polar, allowing it to form hydrogen bonds with water molecules, making it more soluble than neon. Nai (sodium iodide) is an ionic compound that dissociates in water to form Na+ and I- ions, which are highly polar and interact strongly with water molecules, making it the most soluble among the three. Therefore, the correct order of increasing solubility in water is ne < f2 < nai.

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Assuming that the two ions that make up the dissociated compound are in a 1:1 ratio, you can use the concentration of one ion to calculate the concentration of the other ion.

Compound is a chemical substance made up of two or more chemical elements chemically combined in fixed proportions. Compounds can be simple, such as water (H2O), or complex, such as proteins, carbohydrates, and lipids. Compounds are formed when atoms interact in certain ways to form molecules. The atoms of a compound are held together by strong chemical bonds, which can be either ionic or covalent. Compounds can exist as solid, liquid, or gas, and can be either organic or inorganic.

The formula is: Concentration of Ion 1 * 2 = Concentration of Ion 2. For example, if you know the concentration of Ion 1 is 0.2 M, then the concentration of Ion 2 would be 0.2 M * 2 = 0.4 M.

If the two ions do not have a 1:1 ratio, then you would need to have the molar mass of the compound and the molar mass of each individual ion to calculate the concentration of the other ion.

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Answer:

Fluorescent luminaire is the assembly that forms a lamp, called a fluorescent tube, and an armature, which contains the accessories necessary for operation. In certain places, only the lamp is known as a luminaire. The lamp is low pressure mercury vapor discharge and is normally used for domestic or industrial lighting. Its advantage over other types of lamps, such as incandescent lamps, is their energy efficiency.

The lamp consists of a thin glass tube lined internally with various compound chemicals called phosphors, although they generally do not contain the chemical element phosphorus and should not be confused with it. Those chemical compounds emit visible light when receiving ultraviolet radiation. The tube also contains a small amount of mercury vapor and an inert gas, usually argon or neon, at a pressure lower than atmospheric pressure. At each end of the tube is a filament ...

Explanation:

One key feature of the conception of the divine found in Judaism is monotheism, the belief in a single, all-powerful God.

Monotheism is a fundamental characteristic of Judaism. It is the belief in the existence of only one God, who is seen as the creator and ruler of the universe. This monotheistic belief sets Judaism apart from many other ancient religions that embraced polytheism. In Judaism, God is regarded as a singular, indivisible entity who is infinite and beyond human comprehension.

The concept of monotheism in Judaism is rooted in various sacred texts, including the Hebrew Bible (Tanakh) and the teachings of Jewish scholars and philosophers. Judaism emphasizes the oneness and unity of God, rejecting the notion of multiple gods or divine beings. This belief in a singular, transcendent God forms the foundation of Jewish theology and is a defining characteristic of the Jewish conception of the divine.

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Contractraded hydrobromic acid can be purchased as a 40.0% HBr solution with a density of 1.38 g/mL. To determine the molar concentration of the solution, we first need to calculate the mass of HBr in one milliliter of the solution.

We know that the density of the solution is 1.38 g/mL, which means that one milliliter of the solution has a mass of 1.38 grams. Since the solution is 40.0% HBr by weight, we can calculate the mass of HBr in one milliliter of the solution as follows: mass of HBr = 40.0% x 1.38 g/mL, the mass of HBr = 0.40 x 1.38 g, the mass of HBr = 0.552 g. Next, we can use the molar mass of HBr (80.921 g/mol) to calculate the number of moles of HBr in one milliliter of the solution: moles of HBr = mass of HBr / molar mass of HBr, moles of HBr = 0.552 g / 80.921 g/mol, moles of HBr = 0.00681 mol. Finally, we can convert the concentration of the solution (40.0% by weight) to molar concentration (moles of solute per liter of solution): molarity = moles of HBr / volume of solution (in liters). Since we have the number of moles of HBr in one milliliter of solution, we can convert this to the number of moles in one liter of solution by multiplying by 1000: molarity = 0.00681 mol / (1.38 g/mL x 1000 mL/L), molarity = 0.00494 M. Therefore, the molar concentration of the 40.0% HBr solution is 0.00494 M.

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Answer:

bldg licking no-good also

Answer:

Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O. Efficient and economical water splitting would be a technological breakthrough that could underpin a hydrogen economy, based on green hydrogen.

Answer:

4Al + 3O2 --> Al2O3

Step 1; fi

Strontium nitrate is most likely the unknown solution based on the fact that it produces a white precipitate when combined with potassium carbonate but not when combined with potassium sulphate.

A "chemical reaction occurring in an aqueous solution when two ionic bonds combine, yielding the creation of an insoluble salt" is what is meant by the term "precipitation reaction." Precipitates are the insoluble salts created during precipitation reactions.

Antibodies and antigens interact to cause precipitation reactions. They are founded on the idea that two soluble reactants can combine to create one precipitate, which is an insoluble product. Lattice formation is necessary for these processes.

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Answer:

2 butanol or sec butanol

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

Answer:

The combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Explanation:

Given;

CH₄ + 2O₂ → CO₂ + 2H₂O, ΔH = -890 kJ/mol

From the combustion reaction above, it can be observed that;

1 mole of methane (CH₄) released 890 kilojoules of energy.

Now, we convert 59.7 grams of methane to moles

CH₄ = 12 + (1x4) = 16 g/mol

59.7 g of CH₄ \(= \frac{59.7}{16} = 3.73125 \ moles\)

1 mole of methane (CH₄) released 890 kilojoules of energy

3.73125 moles of methane (CH₄) will release ?

= 3.73125 moles x  -890 kJ/mol

= -3320.81 kJ

Therefore, the combustion of 59.7 grams of methane releases 3320.81 kilojoules of energy

Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

The gas that would most likely be found in the greatest amount in bubbles is nitrogen, option c.

When a liquid undergoes a rapid change in pressure or temperature, bubbles are usually formed due to the presence of dissolved gases. Nitrogen is the most abundant gas available in natural environments such as water, due to its high solubility. Nitrogen is the primary component in Earth's atmosphere, with nearly 78% of it dissolved in water bodies.

Nitrogen is readily drawn out of the solution when you reduce pressure or the water temperature rises, leading to bubbles.

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The gas that would most likely be found in the greatest amount in the bubbles is d) carbon dioxide.

During various natural processes and chemical reactions, gases can be released in the form of bubbles. When considering the options given, the gas that is commonly produced and released in significant amounts is carbon dioxide (CO2). Carbon dioxide is a byproduct of respiration, combustion, and other metabolic activities in living organisms. It is also released during the process of fermentation, photosynthesis, and decomposition of organic matter.

Oxygen (O2) is an essential gas for respiration, but it is typically consumed rather than produced in significant quantities during most natural processes. Ozone (O3) is a less common gas and is typically found in the Earth's ozone layer. Nitrogen (N2) is a major component of the Earth's atmosphere, but it is relatively inert and does not readily form bubbles.

Carbon dioxide, on the other hand, is frequently produced and released in various natural and chemical processes, making it the gas most likely to be found in the greatest amount in bubbles.

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Maximum number of electrons in nth energy level

\(\\ \sf\longmapsto 2n^2\)

Now

Max electrons

\(\\ \sf\longmapsto 2(1)^2\)

\(\\ \sf\longmapsto 2e^-\)

Answer:

HEAT OF COMBUSTION PER GRAM OF OCTANE IS 1723.08 J OR 1.72 KJ/G OF HEAT

HEAT OFF COMBUSTION PER MOLE OF OCTANE IS 196.4 KJ/ MOL OF HEAT

Explanation:

Mass of water = 100 g

Change in temperature = 28.78 °C - 21.36°C = 7.42 °C

Heat capcacity of water = 4.18 J/g°C

Mass of octane = 1.8 g

Molar mass of octane = C8H18 = (12 * 8 + 1 * 18) g/mol= 96 + 18 = 114 g/mol

First is to calculate the heat evolved when 100 g of water is used:

Heat = mass * specific heat capacity * change in temperature

Heat = 100 * 4.18 * 7.42

Heat = 3101.56 J

In other words, 3101.56 J of heat was evolved from the reaction of 1.8 g octane with water.

Heat of combustion of octane per gram:

1.8 g of octane produces 3101.56 J of heat

1 g of octane will produce ( 3101.56 * 1 / 1.8)

= 1723.08 J of heat

So, heat of combustion of octane per gram is 1723.08 J

Heat of combustion per mole:

1.8 g of octane produces 3101.56 J of heat

1 mole of octane will produce X J of heat

1 mole of octane = 114 g/ mol of octane

So we have:

1.8 g of octane = 3101.56 J

114 g of octane = (3101.56 * 114 / 1.8) J of heat

= 196 432.13 J

= 196. 4 kJ of heat

The heat of combustion of octane per mole is 196.4 kJ /mol.

Mass of water = 100 g

Change in temperature = 28.78 °C - 21.36°C = 7.42 °C

Heat capcacity of water = 4.18 J/g°C

Mass of octane = 1.8 g

Molar mass of octane = C8H18 = (12 * 8 + 1 * 18) g/mol= 96 + 18 = 114 g/mol

First is to calculate the heat evolved when 100 g of water is used:

Heat = mass * specific heat capacity * change in temperature

Heat = 100 * 4.18 * 7.42

Heat = 3101.56 J

The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.

Micro Organism are organism that can be seen with a microscope.

Microorganisms include bacteria, protozoa, algae, and fungi.

Micro organisms exist in its single-celled form or as a colony of cells.

The main environmental factors that affect microorganism growth include chemical inhibitors, oxygen, pH, nutrients, moisture and temperature.

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Answer:

c.Positively charged electrons

Answer:

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

Explanation:

The Molar Fraction is a way of measuring the concentration that expresses the proportion in which a substance is found with respect to the total moles of the solution, which are calculated by adding the moles of solute (s) and solvent.

It is calculated by dividing the number of moles of one of the components by the total number of moles of the solution.

The sum of all the molar fractions of the substances present in a solution is equal to 1.

So, the expression to calculate the mole fraction is:

\(Molar fraction (Xi)=\frac{moles of sudstance}{total moles of the solution}\)

Being the molar mass of the compounds:

the number of moles that represent the mass quantities is calculated as:

So the total moles in solution are 6.52 moles + 27.78 moles = 34.3 moles

The mole fraction of ethanol in the solution is calculated as:

\(mole fraction of ethanol=x_{ethanol} =\frac{6.52 moles}{34.3 moles}\)

\(x_{ethanol} =0.19\)

The mole fraction of water in the solution is calculated as:

\(mole fraction of water=x_{water} =\frac{27.78 moles}{34.3 moles}\)

\(x_{water} =0.81\)

Then:

\(x_{water} +x_{ethanol} = 0.81 + 0.19\)

\(x_{water} +x_{ethanol} =1\)

The mole fraction of ethanol and water in the solution are 0.19 and 0.81 respectively.

.

The mole fraction of ethanol and water would be 0.19 and 0.81 respectively

The mole fraction of a substance in a solution is the mole of that substance per total number of moles of substances in the solution.

Mathematically, mole fraction of a substance = mole of the substance/total mole of solution.

In this case:

Mole of 300 g ethanol = mass/molar mass

                                     = 300/46

                                             = 6.52 moles

Mole of 500 g water = 500/18

                                  = 27.78 moles

Total moles = 6.52 + 27.78

                       = 34.3 moles

Mole fraction of ethanol = 6.52/34.3

                                         = 0.19

Mole fraction of water = 0.81

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Answer:

Structure of boron trifluoride, an example of a molecule with trigonal planar geometry.

Explanation:

Pattern: Volcanoes and earthquake zones are often found in close proximity to each other, with earthquake zones appearing as long lines on the globe.

The pattern can be attributed to the tectonic plate boundaries. Volcanoes are typically located along plate boundaries where there is subduction or collision of tectonic plates. These areas experience intense geological activity, leading to volcanic eruptions. Earthquake zones, represented by long lines on the globe, coincide with plate boundaries as well. The lines correspond to the locations where plates interact, resulting in significant stress and release of energy, leading to seismic activity. The long lines represent the interconnectedness of multiple earthquake-prone areas along the plate boundaries, forming seismic belts or zones. Therefore, the close proximity of volcanoes and earthquake zones can be explained by their shared association with tectonic plate boundaries and the geologically active regions that result from plate interactions.

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The nitrate ion has 24 valence electrons.

The nitrate ion valence electron is calculated by the number of available electrons of nitrogen and oxygen with the help of a periodic table:

Nitrate ion: NO₃⁻

N = nitrogen

O = oxygen

N(available electrons) = 5

O(available electrons) = 6

Valence electron(NO₃⁻) = N(available electrons) + O(available electrons) * 3 + No. ions

Valence electron(NO₃⁻) = 5 + 6 * (3) +1

Valence electron(NO₃⁻) = 5 + 18 +1

Valence electron(NO₃⁻) = 24

The electrons are the smallest of particles that are negatively charged and they can be either bound to an atom or free.

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Answer:

Letter C is the correct one

Explanation:

A.

AgNO₃ + KCl → AgCl + KNO₃ (Already Balanced)

B.

H₂O + SO₃ → H₂SO₄ (Already balanced)

C.

2KI + Cl₂ → 2KCl + I₂

D.

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

E.

Zn + 2HCl → ZnCl₂ + H₂

F.

BaCl₂ + Na₂SO₄ → BaSO₄ + 2NaCl

G.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

H.

2Al + 3CuCl₂ → 2AlCl₃ + 3Cu

In the case of the equilibrium reaction provided, if the concentration of Co(H2O)2+ is increased, the reaction will shift to the right in order to consume the excess Co(H2O)2+ and produce more CoCl2 and H2O.

Conversely, if the concentration of CoCl2 is increased, the reaction will shift to the left in order to consume the excess CoCl2 and produce more Co(H2O)2+ and Cl- ions.

According to Le Chatelier's principle, a change in concentration of one or more of the reactants or products of a chemical reaction at equilibrium will cause a shift in the equilibrium position to counteract the change and re-establish equilibrium.

Specifically, if the concentration of one of the reactants is increased, the reaction will shift in the direction that consumes that reactant in order to restore equilibrium.

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Answer:

Its food for cannibals.

Answer: The number of atoms present in 591 g of gold is 1.81×10²⁴ atoms

Explanation: The number of atoms present in 591 g of gold is 1.81×10²⁴ atoms

Answer:

6.022×10^²³ / 197×591

= 1.8066×10^²⁴ atoms

The number of molecules in 10.0 gram of NaOH is 15 * 10²².

To solve this question, we need to understand some terms of mole concept,

Mole - It is the amount of substance containing same number of molecules or atoms as there are atoms in 12 gram of carbon-12 isotope.

Molecules - It is group of atoms bonded together, representing the smallest fundamental unit of a chemical compound taking part in chemical reaction.

Molecular weight - The sum of atomic masses of all atoms in molecules.

Avogadro number - It is the number of atoms, ions, electrons, molecules in one mole of substance. It is represented as NA.

NA = 6.0 * 10²³ (approx)

To calculate the number of molecules, we apply the formulae,

no. of molecules = moles * NA

moles = weight / molecular weight

moles = 10.0 / 40

          = 0.25

Substituting this value to calculate number of molecules,

no. of molecules = 0.25 * 6.0 * 10²³

                            = 15 * 10²²

Therefore the number of molecules of in 10.0 g of NaOH is 15 * 10²².

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