It is necessary in certain types of experiments to begin by heating a crucible to constant mass. Identify the steps in this process.

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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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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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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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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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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The molarity of the solution is 66.207 M.

1) number of moles of Na2SO4

number of moles = mass/molar mass = 534/142 = 3.7605633 moles

To precipitate 3.7605633 moles of Na2SO4 we need the same amount of moles of BaCl2 = 3.7605633 moles.

2) molarity of BaCl2 solution

concentration = number of moles/volume =  3.7605633/0.0568

= 66.20710 M

Molarity is defined as the total number of moles of solute in one kilogram of solvent. Molarity is also called molarity.

The symbol for molarity is a capital M. In chemistry, a solution is a mixture of two or more substances in which none of the substances are chemically changed. The formula for calculating molarity is the ratio of the moles of solute for which the molarity is calculated and the volume of solvent used to dissolve the particular solute.

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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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Answer:

What happens when carbon dioxide increases and oxygen decreases? Increasing carbon dioxide and decreasing oxygen make it harder for deep-sea animals to ‘breathe’ About one third of the carbon dioxide that humans produce by burning fossil fuels is being absorbed by the world’s oceans, gradually causing seawater to become more acidic.

Explanation:

Hope this helps

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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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.​

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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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 total translational kinetic energy of 17 moles of an ideal gas is 198,242  j .  the gas temperature in kelvin is 937 K.

Given  that :

total translational kinetic energy = 198242 J

moles = 17 mol = 17 × 6.023 × 10²³

Total kinetic energy =  ( 3/2 KT ) × no. molecules

   198242  = ( 3/2) ( 1.38 × 10⁻²³ ) T × 17 × 6.023 × 10²³

T = 198242  / 211.84

T = 937 K

Thus, The total translational kinetic energy of 17 moles of an ideal gas is 198,242  j .  the gas temperature in kelvin is 937 K.

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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

Answer:

A planetary scientist who works at john hopskin university

Explanation:

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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False. As the reaction proceeds toward equilibrium, the concentrations of [tex]H_2[/tex] and [tex]I_2[/tex] gradually decrease, while the concentration of HI gradually increases.

In a chemical reaction, an equilibrium is reached when a reaction that proceeds in both ways has both forward and backward reactions at an equal rate.

For example, consider the reaction below:

A + B <---> C + D

At equilibrium, the rate of formation of A and B will be equal to the rate of formation of C and D.

Now, let us apply this to the reaction:

[tex]H_2 + I_2 < --- > 2HI[/tex]

Since the reactants are  [tex]H_2[/tex] and [tex]I_2[/tex], initially, their concentrations will decrease while the concentration of the product, HI will increase. This will continue until the reaction reaches an equilibrium.

Thus, that the concentrations of  [tex]H_2[/tex] and [tex]I_2[/tex] will gradually increase while the concentration of HI will gradually decrease as the reaction approaches an equilibrium is false.

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Start by assigning oxidation numbers to the atoms that take part in the reaction.

notice that the oxidation state of zinc changes from zero on the reactants' side to +2 on the products' side, which means that it is being oxidized.

Now take a look at nitrogen's oxidation state. Notice that some nitrogen atoms keep their oxidation state constant, i.e. +5 on both sides of the equation, but that other nitrogen atoms change their oxidation state from +5 to -3, which implies that they are being reduced. Balance the nitrogen atoms first by multiplying the nitric acid by 2. Since you're in acidic solution, you can balance the hydrogen atoms by adding protons,

H

+

, to the side that lacks hydrogen, and oxygen atoms by adding water molecules to the side that lacks oxygen.

Since you only need to balance the hydrogen atoms present on the reactants' side.

Hope that can start you off! And hope that helps!

The balanced chemical equation of the given reaction is written as follows:

[tex]\rm Zn(s)+2HNO_3(aq) \rightarrow Zn(NO_{3})_2(aq)+H_2(g)[/tex]

A balanced chemical equation is a symbolic representation of a chemical reaction that shows the exact number of atoms of each element present in both the reactants and the products.

In a balanced equation, the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of that element on the product side of the equation.

This ensures that the law of conservation of mass is upheld, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged.

The balanced chemical equation is written above.

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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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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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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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The semi-crystalline polymer of the same composition, a completely amorphous polymer is expected to the crystallites scatter light.

Crystallization of polymers is a manner associated with the partial alignment of their molecular chains. these chains fold together and shape ordered areas called lamellae, which compose larger spheroidal systems named spherulites.

Semi-crystalline plastics can be taken into consideration for a selection of applications. choosing a plastic material for use in excessive temperature surroundings calls for a cautious assessment of fabric residence information. View our interactive Thermoplastics Triangle to evaluate substances.

Polyethylene is a partially crystalline solid whose residences are exceedingly dependent on the relative content of the crystalline section and amorphous section, i.e., crystallinity. Polyethylene is a polymer polymerized from monomeric ethylene.

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Potassium is the element that has the ground state electronic configuration, 1s22s22p63s23p64s1.

The electronic configuration describes the distribution of electrons in their atomic orbital. In an electronic Configuration, subshells that contain electrons, and the total number of electrons in each of the subshells are written in a sequence.

It is used to find out the valency of an element, Predict the properties of a group of elements and Interpret atomic spectra.

The subshells are s, p, d, and f and the total number of electrons that they can hold is 2, 6, 10, and 14 respectively.

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HCl⟶H++Cl−

HI⟶H++I−

According to, the molarity of H+ is the same as HCl, because it is a strong acid and the mole ratio. So, I added the molarity of both acids: 0.15 M+0.055 M=0.205 M for H+ in solution.

pH= −log [H+]

pH= −log [0.205]

pH= 0.689

cHI(H+)=c(HI)cHCl(H+)=c(HCl)

Now you need to determine the amount of the protons in each solution with

n=c⋅V.

You have to add the amount of protons in each solution and determine the combined volume.

ntot(H+)=nHI(H+)+nHCl(H+)Vtot=V(HI)+V(HCl)

To calculate the pH of the resulting concentration, just take the negative logarithm.

pH=−logctot (H+) = −log[ntot (H+) Vtot]

pH is the negative logarithm of hydrogen ion concentration in a solution.

It determines the acidity and basicity of the solution.

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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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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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After alpha particles were bombarded onto sheets of gold, the Rutherford model was developed. This model proposed that the atom was composed of a small, dense, positively charged core called the nucleus, with electrons orbiting around this nucleus.

The Rutherford model is a model of the atom that was proposed by Ernest Rutherford in 1911. It was based on his experiments with alpha particles. In the model, the atom is composed of a small, dense nucleus with positive charge surrounded by electrons that orbit the nucleus. The Rutherford model is unable to explain the stability of atoms and the nature of the electromagnetic force, but it did provide a starting point for the development of more sophisticated models of the atom.

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Chemical reaction - 0.823 grams O2 could be produced from 2.45 g of ko2 and 4.48 g of CO_2

What is Chemical reaction?

Chemical reactions happen absolutely everywhere. While we sometimes associate chemical reactions with the sterile environment of test tubes and laboratories, nothing is farther from the truth. In fact, a vast number of transformations are creating a dizzying and almost incomprehensible series of new matter and energy changes in our world every second of every day. In nature, chemical reactions can be much more difficult to control and in some cases much more complex than in the laboratory, and generally occur whether you want it or not!In the woods A raging fire, the slow rusting process of iron over the years in the presence of oxygen and water, or the delicate ripening of fruit on a tree, the transformation of various chemicals, etc... (reactants ) into another group of substances (products) is a so-called chemical reaction.

Moles KO2 = 2.44g/(71.1g/mole) = 0.034 moles

Moles CO2 = 4.45g/(44g/mole) = 0.10 moles

4KO2 + 2CO2 —> 2K2CO3 + 3O2

The reaction requires twice as many moles of KO2 than moles of CO2.  That means 0.10 mole of CO2 would consume 0.20 moles of KO2.  But we only have 0.034 moles of KO2, so the limiting reagent is KO2.  

There are 3 moles of O2 produced for every 2 moles of CO2 consumed.  In this case we'll assume all of the KO2 reacts, so that should result in (3/4) * (0.034moles) = 0.025 moles of O2 .

To get the mass, 0.025 mole * (32g/mole) = 0.823 grams O2

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A balloon filled with room temperature air and then put in a sunny place expands slightly due to a rise in temperature and this is because the molecules of air are moving faster.

Charles' law is an experimental gas law that describes how gases expand when heated. A modern statement of Charles' Law is that Kelvin temperature and volume are directly related if the pressure on a dry gas sample is held constant .

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