1. A sample of a pure substance has a mass of 18 g and a volume of 2 cm) Find the density of
the sample.

We interrogate the equilibrium,

S=2.32×10−4⋅mol⋅L−1

what is solubility?

Solubility in chemistry refers to the capacity of one material, the solute, to create a solution with another substance, the solvent. Insolubility is the solute's inability to create such a solution.

The extent of a substance's solubility in a certain solvent is commonly assessed as the concentration of the solute in a saturated solution, one in which no more solute can be dissolved.

At this stage, the two compounds are considered to be in solubility equilibrium. Some solutes and solvents may have no such limit, in which case the two substances are said to be "miscible in any amounts."

We interrogate the equilibrium

Mg(OH)2⇌Mg+2  +2HO−

And Ksp=[Mg2+][−OH]2

And now if we call the solubility of Mg(OH)2 S, then by definition, S=[Mg2+], and 2S=−OH.

And thus Ksp=S×(2S)2=4S3

And so (finally!), S=3√Ksp4

S=3√5.0×10−114=2.32×10−4⋅mol⋅L−1

so therefore the solubility was found to be 2.32×10-4.mol.L-1

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Sample X is best classified as a heterogeneous mixture

Homogenous mixture has the same uniform composition and appearance through out the reaction and it is difficult to separate the substrates present in it.

A heterogeneous mixture contains of visibly  different phases or substances. Here separating the mixture becomes easy.

In the given question When sample X is passed through the filter paper we see that a white residue is remaining which is Y. This itself suggests that the the mixture is heterogeneous mixture.

As we initially got the residue it suggests that the solution is a homogenous mixture as we can now differentiate two substances

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Neutral lithium is oxidized and changed into Li+ at the anode. When the electrons from the anode reaction are received at the cathode, this causes the reduction of Co(IV) to Co(III).

The biological aerobic system (BOD) of wastewater is decreased after oxidation, which also lessens some contaminants' cytotoxicity. Some contaminants undergo this treatment and are transformed into dioxide, water, and sludges. Disinfection is commonly accomplished using chemical oxidation.

The reaction brought on by coming into touch with oxygen molecules is known as oxidation. These materials can be non-metals like live tissues or metals. Technically speaking, oxidation is the removal of one electrons during the phase of interaction between two or more atoms.

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By activating M₂ muscarinic receptor, acetylcholine released at the heart will slow the rate of action potential generation.

Acetylcholine is the neurotransmitter used at the neuromuscular junction—in other words, it is the chemical that motor neurons of the nervous system release in order to activate muscles. This property means that drugs that affect cholinergic systems can have very dangerous effects ranging from paralysis to convulsions.

An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current.

Acetylcholine slows the heart rate by activating the M2 muscarinic receptor (M2R) that, in turn, opens the acetylcholine-activated potassium channel (IK, ACh) to slow the firing of the sinus node.

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An electrolyte is a solution containing a large concentration of dissolved ions.

A solution containing a large concentration of dissolved ions is called an electrolyte. It mainly consists of dissolved cations ,anions. Some of the most important and commonly discussed electrolytes are

Calcium which plays a pivotal role in bone health in the body and muscle contraction and relaxation.

Sodium, which is responsible for maintaining osmolarity and nerve impulse conduction, the lack of sodium ions in the body may lead to Hyponatremia.

Potassium is another important electrolyte which is responsible for normal heart function and skeletal growth.

Chloride ions which are in close coordination with sodium ions in the body help in maintenance of the body's blood pressure. It can be obtained from tomatoes, olives, etc.

The shortage of these electrolytes in the body can cause physiological problems like tiredness, lethargy, sleeplessness and improper growth in case of children. Hence it is crucial for us to include all the electrolytes in our diet and have foods that are rich in water and electrolytes to stay healthy and fresh.

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The entropy of the system increases according to  increase entropy principle

The Increase in Entropy Principle states that for any process the total change in entropy of a system together with its enclosing adiabatic surroundings is always greater than or equal to zero.

The measure of a system's thermal energy per unit temperature that is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.

So hence when ice cubes are added into a insulated cup of hot water it decreases the temperature and the ice melts

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Answer:

It is a Binary Compound

Explanation:

Answer:

[binary compound]

Explanation:

A(n) A binary compound is one that contains two, and only two, elements.

The attraction between the electron and the atom's nucleus grows stronger as it travels closer to it. The electron goes to a lower potential energy. The electron transition involves the most in n=6 and n=2.

More energy must be changed for a larger movement. The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to bepotential energy.

The energy that an object retains due to its position in relation to other objects, internal stresses, electric charge, or other factors is known as potential energy in physics.

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Benzoic acid showed a smaller rf value than 9-fluorenone in the TLC result because of its different attraction phase, stationary phase, and mobile phase.

The Rf esteem depends on the stationary stage and portable stage of the TLC plate. The Rf esteem of a compound changes based on how pulled it is to the stationary and versatile stages.

As a rule, the stationary stage is silica gel, which is very polar, so the versatile stage is moderately non-polar.  

Benzoic corrosive is moderately polar since it incorporates a carboxylic corrosive bunch. So, it would have a moo Rf value on a TLC plate with silica gel as the stationary stage and hexane as the versatile stage.

The Rf esteem on a TLC plate with silica gel as the stationary stage and 60:40 hexane: ethyl acetic acid derivation as the versatile stage.

The benzoic corrosive would be more pulled into the generally polar 60:40 hexane: ethyl acetic acid derivation than the non-polar hexane portable stage.

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Two anti-bonding orbitals and six electrons in bonding orbitals make up the bond order of the given molecule, which is 2. In the orbital theory, the bonding orbital is used to describe interactions.

The formula for determining bond order is given below. 1/2 (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) (electrons in bonding molecular orbitals - electrons in antibonding molecular orbitals) Bond length and strength are revealed by bond order. A shorter bond length is typically correlated with higher bond order. The fact that there are more bonds between the atoms explains this.

Half of the difference between the number of bonding and antibonding electrons is another definition of bond order in molecular orbital theory.

Bond order is 1/2. (electrons in bonding orbitals - electrons in anti-bonding orbitals.)

Bond order is 1/2. (6-2)

bond order is two.

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For a given sample of ch3oh , the enthalpy change during the reaction is 82.7 kj. The mass of the methane gas will be 32 gram.

When methanol will provide some temperature, then it will break into methane and oxygen gas and release some amount of energy.

The balanced chemical equation can be written as:

[tex]2CH_{3}OH[/tex]→ [tex]2CH_{4} + O_{2}[/tex], ΔH= 82 kJ

It can be seen that 2 mole of methane will produce 82 kj energy.

Hence, the energy of 82.3kj the count of mole could be = (2×82.3)/82

 = 2 moles

The mass will be equivalent to the = 2 × 16 = 32 g

Therefore, the mass of [tex]CH_{4}[/tex] produced will be 32g

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The mass of 4.54 moles of Na₂SO₄, given that it has a molar mass of 142.04 g/mol is 644.77 grams

We know already that the mole of a substance is related to it's mass and molar mass according to the following equation:

Mole = mass / molar mass

Applying the above formula, we can obtain the mass of 4.54 moles of Na₂SO₄. This is illustrated below:

Mole = mass / molar mass

4.54 = Mass of Na₂SO₄ / 142.02

Cross multiply

Mass of Na₂SO₄ = 4.54 × 142.02

Mass of Na₂SO₄ = 644.77 grams

Thus, the mass of 4.54 moles of Na₂SO₄ is 644.77 grams

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Mathematics and science are formal and exact sciences that are based on logic.

Mathematics is an exact science that studies the properties and relationships between entities through geometric figures and arithmetic with numbers. Mathematics then looks for common patterns that could end up leading to a theory and, if it is verifiable and true, end up being a law, such as the Pythagorean law for example.

In terms of science, it is the comparable knowledge that has been studied, explained, and has helped predict social and natural phenomena in our universe over time. This has been done and verified through the scientific method, making it then a verifiable and true logic.

Therefore, we can confirm that mathematics and science are formal and exact sciences that are based on logic.

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Mineral A scratches mineral B, we can infer from here that Mineral A is more harder than Mineral B.

The minerals are the naturally occurring chemical compounds which are found in the earth's layers. Minerals have different properties.

If mineral A is rubbed against mineral B and Mineral A scratches mineral B, we can infer from here that the mineral A is harder than mineral B.

The hardness of the minerals is because of the intermolecular forces between the particles of the minerals. The mineral A might be having strong intermolecular forces in comparison with the mineral B.

This is why when rubbed against each other, the mineral A scratches the particle of the mineral B which has lower intermolecular forces between the particle of the mineral B.

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Complete question - Two unknown mineral samples, A and B, are rubbed against each other. Mineral A scratches mineral B. What can you infer about the minerals?

O Mineral A is harder than mineral B.

O Mineral B is harder than mineral A.

O Mineral A is more dense than mineral B

Mineral B is denser than mineral A.​

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Answer:

2Li3PO4(aq) + 3Ca(C2H3O2)2(aq)

- - - > Ca2(PO4)2(s) + 6LiC2H3O2(aq)

The empirical formula of this compound is ClO₇.

If a 5.00 g sample of a compound containing only chlorine and oxygen contains 1.94 g of chlorine, then the mass of its oxygen is the difference between the mass of the sample and the mass of its chlorine.

mass compound = mass oxygen + mass chlorine

mass oxygen = mass compound - mass chlorine

mass oxygen = 5.00 g - 1.94 g

mass oxygen = 3.06 g

Determine the number of moles of each component by dividing the mass by its respective molar mass.

moles oxygen = mass oxygen / MM

moles oxygen = 3.06 g / 15.9994 g/mol

moles oxygen = 0.1912571721

moles chlorine = mass chlorine/ MM

moles chlorine = 1.94 g / 70.9060 g/mol

moles chlorine = 0.02736016698

Get the ratio between the two components to determine its empirical formula.

moles oxygen : moles chlorine = 0.1912571721 : 0.02736016698

moles oxygen : moles chlorine = 7 : 1

Hence, he empirical formula of this compound is ClO₇.

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HCl can be added to separate benzylamine from the toluene mixture.

A widely used method of separating two liquids from each other or popularly called liquid-liquid extraction is being implemented here.

The knowledge of pH values helps in treating the contents of the solution that is to be extracted and their subsequent isolation as well Here, the concept of acid-base extraction is applied to understand that the separation of benzylamine which is an organic base can be done by extracting it by adding HCl to the solution. The addition of hydrochloric acid leads to the formation of a corresponding ammonium salt, the amine can be later recovered by adding a base thereby converting the formed compound back to benzylamine.

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The excess reactant in the preparation of pizza from the given materials is tomato sauce; option B

In a chemical reaction, the excess reactant is the reactant that is left over at the end of the reaction.

The excess reactant is present in a quantity greater than the mole ratio of the reactant to form a product.

Considering the given reaction and the mole ratio of the reaction:

Recipe for  1 pizza =  1 crust, 1 scoop of tomato sauce, 0.5 cups of shredded mozzarella cheese, and 9 slices of pepperoni.

Amount present =  2 crusts, 4 scoops of tomato sauce, 1 cup of cheese, and 9 slices of pepperoni.

Excess reactant = tomato sauce.

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Answer:

Cheese

Explanation:

Did the lab

Nuclear equation: ninety-two 238 U → ninety 234 T h + 2 4 H e + power.

In nuclear physics and nuclear chemistry, a nuclear response is a method in which two nuclei, or a nucleus and an external subatomic particle, collide to supply one or greater new nuclides. accordingly, a nuclear response need to purpose a transformation of at the least one nuclide to some other.

Nuclear Fusion reactions electricity the sun and other stars. In a fusion response, two light nuclei merge to form a single heavier nucleus. The method releases strength due to the fact the whole mass of the resulting single nucleus is less than the mass of the two unique nuclei. The leftover mass turns into energy.

Nuclei with too many neutrons, too few neutrons, or which might be absolutely too massive are risky. They eventually rework to a stable form thru radioactive decay. wherever there are atoms with risky nuclei, there are nuclear reactions taking place clearly.

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The temperature, pressure, and precipitation conditions of the atmosphere for a specific place on a given day is called weather, whereas a longer-term view of these same factors, typically taken over a period of many years, is called climate.

We can describe the weather of the place as the temperature or atmosphere of a place on a certain day. On the other hand, the climate is the long-term weather condition of a place. The climate describes the average weather of the place.

A climate tends to remain unchanged for a place over several years whereas the temperature is the regular day-to-day change in the atmospheric conditions.

The climate of a region is determined by the average atmospheric conditions of a place that are recorded and observed over a long period of time.

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I would have to go with D

Hope this helps

Answer:

just give the other person brainliest

Explanation:

Using the automatic pipette method, the density of the liquid is 0.82 g/ml.

Density, denoted by ρ, is the property of a substance which determines whether it will sink or float. It is the ratio between the mass of the substance and its volume. It can be calculated using the formula below.

ρ = m/v

where ρ = density

m = mass

v = volume

Given that a 100-μl automatic pipette was used, then the volume of the liquid is 100 μl.

1 µL = 0.001 mL

100 µL = 0.1 mL

Plug in the values and solve for the density of the liquid.

ρ = m/v

ρ = 0.082 g / 0.1 mL

ρ = 0.82 g/ml

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Answer:Does alcohol really burn off when cooking? what are the possible substitutions for alcohol in recipes?

Explanation:

The longer you cook, the more alcohol cooks out, but you have to cook food for about 3 hours to fully erase all traces of alcohol. A study from the U.S. Department of Agriculture's Nutrient Data lab confirmed this and added that food baked or simmered in alcohol for 15 minutes still retains 40 percent of the alcohol.

The isotope that has the highest percent abundance is Os-190.

We know that the amount of the element that can be found in the universe does differ because the element is composed of isotopes. The isotopes are the atoms of the element that have the same atomic number but does have different mass numbers.

Now we know that the two common isotopes of osmium are Os-190 and Os-191. The isotope that would have the highest percent abundance is the isotope whose mass is closer to the relative atomic mass of osmium which is 190.23.

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When a system is compressed from 50 liters to 5 liters at a constant pressure of 10 atmospheres, how much work is done must be determined. Therefore, worked on is equal to p delta v less. P stands for pressure and refers to atmosphere. Therefore, we must convert it to newtons per square meter.

The equivalent of 10 atmosphere is 10 times 10 1, 3, and 5. The final volume and its beginning volume are the Newton perimeter square and changing volume. The total number of letters is five.

Additionally, we must afterwards convert into meter cube. Now, one letter equals ten to the power three minus m cube. In order to get 15 times 10 to the power of 3 meter cube, we increase it by 10 to the monastery's -50 L.

volume-temperature (constant pressure) When pressure is constant, a gas's volume and temperature are directly inversely related. When pressure is constant, the volume to temperature ratio remains constant. The term "Charles' law" or "Gay-law" Lussac's refers to this relationship.

When we say that the gases are under constant pressure, we mean that the pressures do not change depending on where we are in the cylinder. Both gases fill the entire space and, as you mentioned, exert different pressures. The partial pressure of a gas is the pressure it exerts within a mixture.

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Combustion of coal is the  largest source of anthropogenic carbon dioxide emission worldwide given by the carbon footprints.

What are carbon footprints?

Carbon footprints are the total amount of emissions of green house gases by a product, place or an event. The main of this is to take actions against the emission of greenhouse gases and reduce them. It is estimated that burning of 1 Kg coal can give about 2.42Kg of carbon dioxide.

Combustion of coal releases more carbon dioxide than burning petroleum products or natural gas in the whole worldwide. Carbon dioxide is the most important greenhouse gas contributing to the global warming. Coal is considered to be having the highest carbon footprints out of all the energy sources.

Therefore, coal combustion gives out the highest carbon footprint giving the highest carbon dioxide worldwide.

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The mass percent of the methanol is 21.83%.

The parameter

Calculate the mass of methanol and water.

[tex]\rho = \frac{m}{V}[/tex]

m = ρ × V

Where m is a mass (kg), ρ is the density (kg/m³), and V is volume (m³)

Mass percent of the methanol

= [tex]\frac{mass \: of \: methanol}{mass \: of \: solution} \times 100\%[/tex]

= [tex]\frac{m_1}{m_1 + m_2} \times 100\%[/tex]

= [tex]\frac{158.4}{158.4 + 567.1} \times 100\%[/tex]

= [tex]\frac{158.4}{725.5} \times 100\%[/tex]

= 0.2183 × 100%

= 21.83%

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The colors of the starting solutions differ in case of high and low concentrations, because the titrations start at different pH values.

The colors of the starting solutions vary in case of high and coffee concentrations, due to the fact the titrations start at distinctive pH values. In case of excessive concentrations, the starting color is of brilliant pink red, converting to purple orange all through innovative titration.

The signs have a chemical structure which can soak up mild beneath positive pH conditions and both change shade or grow to be colorless below other pH situations. This normally happens because of a exchange in protonation of the purposeful group of the molecule.

Whether an answer is acidic or simple can be measured at the pH scale. When everyday indicator is brought to a solution, the color change can indicate the approximate pH of the solution. Acids purpose universal indicator option to trade from green in the direction of crimson.

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