Can someone please help? THIS IS SUPER HARD!!!!!!!

Answer:

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

Answer:

During DNA replication, each of the two strands that make up the double helix serves as a template from which new strands are copied. The new strand will be complementary to the parental or “old” strand. Each new double strand consists of one parental strand and one new daughter strand.

Explanation:

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Answer:

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

Explanation:

Answer:

[tex]2\text{P}+ 5\text{Cl}_2 \rightarrow 2\text{PCl}_5[/tex]

Explanation:

Answer:

2P (s) + 5PCl₂ (g) → 2PCl₅ (s)

Explanation:

There are 2 chlorine atoms on the reactant side and 5 chlorine atoms on the product side.

Hence, multiply the left chlorine molecule by 5 and right compound by 2.

⇒ P (s) + 5 × Cl₂ (g) → 2 × PCl₅

⇒ P (s) + 5Cl₂ (g) → 2PCl₅ (s)

But, now we see that there is 1 phosphorus atom on the reactant side and 2 phosphorus atoms on the right.

So, multiply the left phosphorus atom by 2 to balance.

⇒ 2 × P (s) + 5PCl₂ (g) → 2PCl₅ (s)

⇒ 2P (s) + 5PCl₂ (g) → 2PCl₅ (s)

Answer:

Chemical bonds

Explanation:

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

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

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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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

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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.

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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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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The conductance of the electric current through the electrolytic solution increases with increase in concentration.

An electrolytic solution is a solution containing dissolved electrolyte.

The ions of the electrolyte dissociate and are able to carry electric current around the electrolytic cell.

The higher the concentration of the electrolyte, the more electric current it can conduct due to greater number of ions present.

Therefore, the conductance of the electric current through the electrolytic solution increases with increase in concentration.

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Answer:

Ba

Explanation:

Atomic radius increases going right to left, and up to down.

So the closest element to the bottom left corner is Ba.

Answer:

what is super hard?

Explanation:

what?

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:

Decomposition begins at the moment of death, caused by two factors: 1.) autolysis, the breaking down of tissues by the body's own internal chemicals and enzymes, and 2.) putrefaction, the breakdown of tissues by bacteria.

Explanation:

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The mass of [tex]Na_2CO_3[/tex] that will be required to be dissolved in water would be 15.9 grams

Recall that:  molarity = mole/volume in L

In this case, the volume is 0.3 L and the molarity is 0.5 M.

Thus, mole = molarity x volume = 0.5 x 0.3 = 0.15 moles

Mass of 0.15 moles  [tex]Na_2CO_3[/tex] = 0.15 x 106 = 15.9 grams

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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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The volume of excess oxygen will 2.28 L

From the equation of the reaction:

[tex]CH_4(g) + 2O_2(g) --- > CO_2(g) + 2H_2O(g)[/tex]

The mole ratio of the two reactants is 1:2.

1 mole of gas at STP = 22.4 L

Mole of 29.2 L of methane at STP = 29.2/22.4 = 1.3 moles

Mole of 63.3 L of oxygen at STP = 63.3/22.4 = 2.8 moles.

Thus, oxygen is in excess because 1.3 x 2 = 2.6 moles is needed to react with 1.3 moles methane.

Excess mole of oxygen = 2.8 - 2.6 = 0.2 moles

Volume of 0.2 moles at STP = 22.4 x 0.2 = 2.28 L

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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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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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Answer:

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

Answer: The answer is true.

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

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 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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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.