Help please I will mark Brainliest for the correct answer!! IT'S DUE IN A COUPLE OF HOURS.

Answer:

The amount of NaOH required to prepare a solution of 2.5N NaOH.

The molecular mass of NaOH is 40.0g/mol.

Explanation:

Since,

NaOH has only one replaceable -OH group.

So, its acidity is one.

Hence,

The molecular mass of NaOH =its equivalent mass

Normality formula can be written as:[tex]Normality=\frac{mass of solute NaOH}{its equivalent mass} * \frac{1}{volume of solution in L} \\[/tex]

Substitute the given values in this formula to get the mass of NaOH required.

[tex]2.5N=\frac{mass of NaOH}{40g/mol} *\frac{1}{1L} \\mass of NaOH=2.5N*40gmol\\ = 100.0g[/tex]

Hence, the mass of NaOH required to prepare 2.5N and 1L. solution is 100g

Answer: The percentage yield of [tex]CO_2[/tex] is 90.26%.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of [tex]CaCO_3[/tex] = 80 g

Molar mass of [tex]CaCO_3[/tex] = 100 g/mol

Plugging values in equation 1:

[tex]\text{Moles of }CaCO_3=\frac{80g}{100g/mol}=0.8 mol[/tex]

For the given chemical equation:

[tex]CaCO_3\rightarow CaO+CO_2[/tex]

By the stoichiometry of the reaction:

If 1 mole of [tex]CaCO_3[/tex] produces 1 mole of [tex]CO_2[/tex]

So, 0.8 moles of [tex]CaCO_3[/tex] will produce = [tex]\frac{1}{1}\times 0.8=0.8mol[/tex] of [tex]CO_2[/tex]

Molar mass of [tex]CO_2[/tex] = 44 g/mol

Plugging values in equation 1:

[tex]\text{Mass of }CO_2=(0.8mol\times 44g/mol)=35.2g[/tex]

The percent yield of a reaction is calculated by using an equation:

[tex]\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100[/tex] ......(2)

Given values:

Actual value of [tex]CO_2[/tex] = 35.2 g

Theoretical value of [tex]H_2CO_3[/tex] = 39 g

Plugging values in equation 2:

[tex]\% \text{yield of }CO_2=\frac{35.2g}{39g}\times 100\\\\\% \text{yield of }CO_2=90.26\%[/tex]

Hence, the percentage yield of [tex]CO_2[/tex] is 90.26%.

The electron structures of hydrogen (H) and lithium (Li) are similar as " they both have 1 electron in an s sublevel".

The quantum theory defines a sublevel as an energy level. Sublevels in chemistry refer to the energy caused by electrons. Sublevels can also relate to energy caused with the nucleus in physics.

It is know that the atomic number of hydrogen is 1 and the atomic number of lithium is 3.

The electronic configuration of H = [tex]1s^{1}[/tex].

The electronic configuration of Li = [tex]1s^{2} 2s^{1}[/tex].

Its can be seen that hydrogen and lithium both posses 1 electron in s sublevel

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Answer:

74

Explanation:

The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products

hope this helps!

The total mass of the products will also be 74 g

From the above law, we understood that in any chemical reaction, the total mass of reactants must be equal to the total mass of products i.e

From the question given above,

Total mass of reactants = 74 g

Total mass of reactants = Total mass of products

74 g = Total mass of products

Thus,

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Answer: The mass of [tex]AlCl_3[/tex] produced is 889.38 g

Explanation:

We are given:

Moles of Al = 8 mol

Moles of [tex]Cl_2[/tex] = 10 mol

For the given chemical reaction:

[tex]2Al+3Cl_2\rightarrow 2AlCl_3[/tex]

By stoichiometry of the reaction:

If 3 moles of chlorine gas reacts with 2 moles of Al

So, 10 moles of chlorine gas will react with = [tex]\frac{2}{3}\times 10=6.67mol[/tex] of Al

As the given amount of Al is more than the required amount. Thus, it is present in excess and is considered as an excess reagent.

Thus, chlorine gas is considered a limiting reagent because it limits the formation of the product.

By the stoichiometry of the reaction:

If 3 moles of [tex]Cl_2[/tex] produces 2 mole of [tex]AlCl_3[/tex]

So, 10 moles of [tex]Cl_2[/tex] will produce = [tex]\frac{2}{3}\times 10=6.67mol[/tex] of [tex]AlCl_3[/tex]

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

We know, molar mass of [tex]AlCl_3[/tex] = 133.34 g/mol

Putting values in above equation, we get:

[tex]\text{Mass of }AlCl_3=(6.67mol\times 133.34g/mol)=889.38g[/tex]

Hence, the mass of [tex]AlCl_3[/tex] produced is 889.38 g

Answer:B

Explanation:

Answer:

D

the angles wich light is coming into the medium are not the same for all wavelengths (colors, at least in the visible spectrum). same for outgoing light.

the same it true for any transparent barrier between two different materials, like air and water.

A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.

A glass or other transparent object in the form of a prism, especially one that is triangular with refracting surfaces at an acute angle with each other and that separates white light into a spectrum of colours.

A prism is an optical component that serves one of two major functions: it disperses light, or it modifies the direction (and sometimes polarization) of light.

In some cases, a prism has more than one function. Prisms are usually transparent to the region of the electromagnetic spectrum being observed.

The prisms are employed to produce polarized light for optical instruments such as microscopes and polarimeters.

Mirrors are commonly utilized to fold the light beam through an optical system.

Therefore, A prism separates the wavelengths contained in a beam of light. Hence Option (D) is correct.

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Answer:

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Answer:

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Explanation:

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Answer: The mass of water required is 18.52 g

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)

Given mass of magnesium hydroxide = 30.0 g

Molar mass of magnesium hydroxide = 58.32 g/mol

Plugging values in equation 1:

[tex]\text{Moles of magnesium hydroxide}=\frac{30.0g}{58.32g/mol}=0.5144 mol[/tex]

The given chemical equation follows:

[tex]Mg(OH)_2+2HCl\rightarrow MgCl_2+2H_2O[/tex]

By the stoichiometry of the reaction:

If 1 mole of magnesium hydroxide produces 2 moles of water

So, 0.5144 moles of magnesium hydroxide will react with = [tex]\frac{2}{1}\times 0.5144=1.0288mol[/tex] of water

Molar mass of water = 18 g/mol

Plugging values in equation 1:

[tex]\text{Mass of water}=(1.0288mol\times 18g/mol)=18.52g[/tex]

Hence, the mass of water required is 18.52 g

Answer:

Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). ... Modern version of the periodic table of the elements (printable).

Answer:

Explanation:

Factor 1 is amount of sunlight as it provides energy for photosynthesis; the process in which the energy storage molecules are produced.

Factor 2 is amount of carbon dioxide as it is the reactant, along with water, which is converted through photosynthesis into energy storage molecules, glucose.

Answer:

Explanation:

1 - sun light cuz' its energy source 4 photosynthesis which produces the energy storage molecules

2 - CO2 n H2O cuz' they react during photosynthesis to produce energy storage molecules

Explanation:

bc they are avocado.. and brown

Answer:

The strength of an individual H bond depends on the polarity of the H-X bond and therefore on the electronegativity of X ( the more delta positive the H atom, the stronger the electrostatic force of attraction between it and a lone pair of electrons). Thus, on a per bond basis, HF H bonding is strongest. However, as water has two H atoms, each molecule can form two H bonds so on a per molecule basis, water H bonding is strongest (this is evidenced by the boiling points of the three substances; NH3 < HF < H2O.)

Explanation:

Correct me if I'm wrong

Answer:

i think this is it

Explanation:

particles and gases

Answer:

18.89 g of Al₂O₃.

Explanation:

The balanced equation for the reaction is given below:

4Al + 3O₂ —> 2Al₂O₃

Next, we shall determine the masses of Al and O₂ that reacted and the mass of Al₂O₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of Al = 27 g/mol

Mass of Al from the balanced equation = 4 × 27 = 108 g

Molar mass of O₂ = 16 × 2 = 32 g/mol

Mass of O₂ from the balanced = 3 × 32

= 96 g

Molar mass of Al₂O₃ = (27×2) + (16×3)

= 54 + 48

= 102 g/mol

Mass of Al₂O₃ from the balanced equation = 2 × 102 = 204 g

SUMMARY:

From the balanced equation above,

108 g of Al reacted with 96 g of O₂ to produce 204 g of Al₂O₃.

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

108 g of Al reacted with 96 g of O₂.

Therefore, 10 g of Al will react with

= (10 × 96)/108 = 8.89 g of O₂.

From the calculation made above, we can see clearly that only 8.89 g out of 19 g of O₂ given, reacted completely with 10 g of Al.

Therefore, Al is the limiting reactant and O₂ is the excess reactant.

Finally, we shall determine the mass of aluminium oxide, Al₂O₃, produced from the reaction.

NOTE: in this case, the limiting reactant will be used because it will give the maximum mass of the aluminium oxide, Al₂O₃ as all of it is consumed in the reaction.

Al is the limiting reactant and the mass of aluminium oxide, Al₂O₃ produced can be obtained as follow:

From the balanced equation above,

108 g of Al reacted to produce 204 g of Al₂O₃.

Therefore, 10 g of Al will react to produce = (10 × 204)/108 = 18.89 g of Al₂O₃.

Thus, 18.89 g of Al₂O₃ were obtained from the reaction.

Answer:

c. i hope im not wrong hmmm

Answer:

keep the soil wet

Explanation: if the song wet it will not cause as much dust storms

Answer:

Ghawar field   location-Saudi Arabia

Burgan Field   location-Kuwait

Ahvaz field      location-Iran

Upper Zakum Oil Field   Location-Abu Dhabi UAE

Explanation:

I learned this yesterday :D

Answer:MgI2

Explanation:

Answer:

As the reaction between metals and acid produces flammable hydrogen, chemist's usually make salts by reacting a metal oxide or metal carbonate with an acid.

Explanation:

I just tried

Explanation:

Fe- reducing agent (since it is oxidized to fe203)

v203- oxidizing agent(since it is reduced)

In the given reaction, Fe is the reducing agent and V is the oxidizing agent.

An atom or compound that loses its electrons to other substances in a reduction-oxidation reaction and gets oxidized to a higher valency state is called a reducing agent.

A reducing agent can be defined as one of the reactants of a redox reaction that reduces the other reactant by giving its electrons to the reactant. If the reducing agent can not give away its electrons to others in a reaction, then the reduction reaction cannot occur.

Given, the following chemical reaction:

2Fe + 3V₂O₃ → Fe₂O₃ + 6VO​

The V₂O₃ oxidation state of V:

2 x + 3(-2) = 0

2x = 6

x = + 3

The Fe₂O₃ oxidation state of Fe:

2 y + 3 (-2) = 0

2y = 6

y = + 3

The V acts as an oxidizing agent because it accepts one electron to change the oxidation state from +3 to +2.

Fe acts as a reducing agent because it gives out its electrons to change the oxidation state from 0 to +3.

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for a clear understanding of how closely they are related, scientists compare their DNA, an essential molecule that's the instruction manual for building each species. Humans and chimps share a surprising 99 percent of their DNA.

Answer:

the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

Explanation:

basically when plants make food for themselves

Answer:

Explanation:

Answer:

d

Explanation:

Answer:

See image

Explanation: