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Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]

hence correct option is (C)

According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

Given Equation ;

Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]

Given Quantities ;

Amount of Zinc = Excess

Amount of 1.0 mol/ltr HCl = 100 ml

It means, Number of moles of H = 0.1 mole

Temperature = 298 K

Pressure = 1 Atm

This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.

therefore, using Ideal gas equation ;

PV=nRT

1 x V = 0.1 x 0.0821 x 298

volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]

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In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.

An abiotic factor is a non-living part of an ecosystem that shapes its environment.

Biotic and abiotic factors make up a community via interaction.

Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.

Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun

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What is an abiotic factor?

♠ Among the list of components given, the abiotic factors are water, rock, soil, sun

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Answer:

An Arrhenius base is a substance that dissociates in water to form hydroxide (OH–) ions. In other words, a base increases the concentration of OH– ions in an aqueous solution.

multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48

7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.

A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.

Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.

number of moles = given mass/ molar mass

                            = 12.7/  96.08

                            = 0.13moles

number of particle=  0.13 ×   6.022×10²³  

                              = 7.96 x 10²²    

Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.

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An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.

The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.

The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.

An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.

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Salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.

The attractive forces between particles in the salt and sugar substances have strong because of its solid state while on the other hand, the attractive force between particles of oil is weak because of its liquid state.

So we can conclude that salt and sugar have strong attractive forces whereas oil has weak attractive forces between particles.

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The strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.

The melting point of a substance is the temperature at which the solid substance melts.

The melting point of a substance is a constant for a pure substance.

The higher the attractive forces between the molecules of a substance, the higher the melting point will be.

Between the three substances, oil has the lowest melting point while salt has the highest melting point.

Therefore, the strength of the attractive forces between the molecule of oil, sugar and salt increases from oil to sugar to salt.

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[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.

A polyatomic ion is an ion composed of two or more atoms. Examples: The hydroxide cation ([tex]OH^-[/tex]) and the phosphate cation ([tex]PO_4^{3-}[/tex]) are both polyatomic ions.

[tex]PO_4^{-3}[/tex] and [tex]NH^{4+}[/tex] are the polyatomic anions because both contain more than 1 atom.

Hence,[tex]PO_4{-3}[/tex] and [tex]NH^{4+}[/tex] are polyatomic anions composed of two or more atoms.

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When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.

Solutions are formed when a solute particle dissolves in another substance known as a solvent.

Usually, solutions are formed when solids dissolve in liquids.

The solid is the solute while the liquid is the solvent.

When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.

Therefore, solutions are formed when solute particles dissolve in solvents.

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Answer:

c

Explanation:

chem ed 2022

The atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

The total distance from the nucleus of an atom to the outermost orbital of its electron is known as its atomic radii or atomic radius.

As we go down the group, the number of orbits or shell increases.

Hence, atomic radii of the atoms in the group 1 increases down the group as we go from Hydrogen to Francium.

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Answer:

Chemical bonds

Explanation:

Because it has an image of atoms being held together by chemical bonds.

Answer: The answer is true.

Explanation: Avogadro's number is a mole, which concludes that this statement is true.

Answer:

The correct answer is A, or "so they can effectively communicate their findings.

Explanation:

The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.

Please brainliest answer

I appreciate it :)

The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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An element in group 6A, period 3 with an atomic number of 16 would be brittle in nature.

Brittleness is the characteristic of a substance to break easily when hit with an object or against an object.

The element with the atomic number 16 is sulfur. Sulfur does not conduct heat nor electricity and neither can it be turned into wire.

Sulfur exists naturally as a brittle solid that is yellow in appearance.

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Answer:

on the surface of the cathode

Answer:

The slope of the trend line is 2.55; as the temperture.

Explanation:

Answer:

The solid has broken down into pieces so small that its particles spread all throughout the new mixture.

The equation for this reaction is

[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.

Answer: 2 moles

Explanation:

We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)

So, the answer is 2 moles.

The normality is the ratio of the equivalent to the volume of the solvent. To the mixture, 1.182 gms of magnesium should be added.

Normality (N) is the grams or moles of solute per liter of solution.

Magnesium has 2 valence electrons in the outermost shell so,

1 mEq of Mg⁻² ions = atomic number of Mg ÷ valence electron

= 12 ÷ 2

= 6 mg

In a liter solution having 197 meq/l of Mg⁻²:

197 meq/l of Mg⁻² × 6 = 1182 mg

Therefore, 1.182 gms of magnesium ions should be added to the mixture.

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Electrical engineers are the scientists that study the production of electricity more efficient.

Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.

So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.

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Answer:

1.3 M

Explanation:

The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.

Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M

Answer:

In water, bases dissolve and provide hydroxide (OH-) to the surrounding solution. This lowers the acidity of the solution.

Answer:

1) Use a stronger battery

Explanation:

I'm going to quote Northeastern University (I could try to type out an explanation but this will probably be more concise)

"Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet."

4) So, if the coils are creating a moving charge, and there are more coils, each coil will be "setting up" its own magnetic field.  This means that less coils will make the electromagnet weaker

2) Because it is an electromagnet, a plastic nail is not going to produce the same effect. An electromagnet is picking up metal, and it is not picking up plastic. This is because plastic (a material with low permeability) does not have a magnetic field that is able to interact with a magnet.

[Permeability is a measure of how easily magnetic lines of force can pass through a material.]

3) There's not really a point that I can imagine of gluing the wire to the nail. Glue would put more distance between the nail and the magnet than nothing being there at all.

1) More voltage in a battery produces a larger current in the wire. This means that the strength of an electromagnet is affected by the voltage/strength of the battery. So, a stronger battery would make the electromagnet stronger, and a weaker battery would make the electromagnet weaker.

The electromagnet works, and he's able to pick up metal objects with it, he does to make it stronger  to use a stronger battery. Therefore, option 1 is correct.

An electromagnet is a type of magnet where an electric current creates the magnetic field. The wire that makes up an electromagnet is typically twisted into a coil. A magnetic field is produced by a current flowing through the wire and is concentrated in the hole in the center of the coil.

Electrical devices including motors, generators, speakers, computers, and MRI machines cannot be built without electromagnets. They are well known for their ability to lift and move heavy magnetic objects, such as scrap iron.

Many electromagnets have an advantage over permanent magnets because they can be easily turned on and off, and increasing or decreasing the amount of electricity flowing around the core can control their strength.

Thus, option 1 is correct.

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Answer:

Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.

Answer:

what is super hard?

Explanation:

what?

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

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The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.

The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.

Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.

Therefore, option C. equilibrium constant is represented by K is true.

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