pls check for me !! thank you.​

Answer:What did Boyle conclude about elements like gold and lead?

Explanation:

Aristotle did not believe in the atomic theory and he taught so otherwise. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. He believed all substances were made of small amounts of these four elements of matter.

Answer: a. Calculate the molar mass of aspartame. 294.3 g/mol b.

Explanation:

Answer:

[tex]1 \: mole \: weighs \: 294.3 \: g \\ 1.66 \: moles \: weigh \: (1.66 \times 294.3) \\ = 488.5 \: g[/tex]

Answer:

C + 2H2 = CH4

Given 30.2g of H2

Find the Moles

Mole =Mass/Molar Mass

Molar Mass of H2 = 1x2 = 2g/mol

Mole = 30.2/2

= 15.1moles of Hydrogen gas.

Now from the balanced equation of Reaction above...

1mole of Carbon reacts completely with 2moles of Hydrogen gas.

"x" moles of carbon with react with 15.1moles of Hydrogen

x = 15.1/2

=7.55moles of carbon.

We now have moles of carbon.

To find mass

Mole =Mass/Molar Mass

Mass = Mole x Molar Mass

Molar mass of carbon = 12g/mol

Mass = 7.55 x 12

Mass = 90.6g of carbon is needed.

The word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen.

A chemical reaction is the process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

According to this question, sodium (Na) and water (H2O) are involved in a chemical reaction to produce sodium hydroxide (NaOH) and hydrogen gas (H2).

Therefore, the word equation that represents the violent reaction between sodium and water is as follows: sodium + water → sodium hydroxide + hydrogen

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Answer:

143.9 mL

Explanation:

Applying,

PV = P'V'................. Equation 1

Where P = Initial pressure, V = Initial Volume, P' = Final pressure, V' = Final volume.

Make V' The subject of equation 1

V' = PV/P'............. Equation 2

From the question,

Given: P = 0.947 atm, V = 150 mL, P' = 750.12 mm of Hg = (750.12/760) = 0.987 atm,

Substitute these values  into equation 2

V' = (0.947×150)/0.987

V' = 143.9 mL

Answer:

Chlorine has 17 total electrons with electron configuration 1s^2 2s^2 2p^6 3s^2 3p^5.

What are the first two quantum numbers for the six electrons in the 2p subshell?

Explanation:

The principal quantum number represents the shell number in which the electron is present.

It is represented with "n".

The next quantum number is the azimuthal quantum number.

It represents the shape of the orbital.

It has values from 0 to (n-1).

Its value depends on the principal quantum number.

Chlorine has 17 total electrons with electron configuration 1s^2 2s^2 2p^6 3s^2 3p^5.

For the six elecetrons in 2p subshell:

The first two quantum number values are the same and their values are:

n=2 , l=1.

Answer:

A

Explanation:

Explanation:

6×1.25×37.5= 281.5 g of chlorine

1×1.25×2= 2.5 g of hydrogen

Answer:

wood being taken for manufacturing

Answer:

carboxyl group (COOH) and amines

Explanation:

The two functional group present in the shown molecule are carboxylic acid group and amine group.

Functional group is defined as a substituent or group of toms or an atom which causes chemical reactions.Each functional group will react similarly regardless to the parent carbon chain to which it is attached.This helps in prediction of chemical reactions.

The reactivity of functional group can be enhanced by making modifications in the functional group .Atoms present in functional groups are linked to each other by means of covalent bonds.They are named along with organic compounds according to IUPAC nomenclature.

Functional group inter conversion is also possible by retro -synthesis.In some cases , functional groups can be charged molecules.

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Answer:

Which of the following substances are ionic?

Check all that apply.

AlCl3

MgI2

C2H5OH

NH3

Explanation:

An ionic substance is formed between a positively charged cation and a negatively charged anion.

Ionic substances are generally formed from metal and nonmetal atoms with the metal atoms forming the cations and the nonmetal atoms forming the anions.

Among the given substances,

MgI2 is an ionic substance.

Since Mg is the metal atom. It forms a cation.

I is a  nonmetal atom. It forms anion.

Hence,

MgI2 is an ionic substance.

Though AlCl3 looks like an ionic substance it is a covalent compound.

This is due to the high polarizability of [tex]Al^3+[/tex] ion.

The remaining two compounds do not contain any metal atoms.

So, ethanol and NH3 are not ionic compounds.

Answer:

MgI2

Answer:

A3+ and B-

Explanation:

Elements in group 13 have outermost electron configuration, ns2np1 hence they form trivalent positive ions.

Elements in group 17 have outermost electron configuration ns2np5 hence they form univalent negative ions.

This implies that, if element A is in Group 13 and element B is in Group 17, the ions formed are A3+ and B-.

Sắt oxit

Explanation:

Answer:

The size of the force varies inversely as the square of the distance between the two charges. Therefore, if the distance between the two charges is doubled, the attraction or repulsion become weaker, decreasing to one-fourth of the original value. ...The size of the force is proportional to the value of each charge.

Answer:

It's decomposition

explanation:

Answer:

The mass percent of hydrogen in hydrogen peroxide is 5.88

The mass percentage of hydrogen in water is 11.19 percent.

Answer:

the order in which orbitals 4f,5p,5d,and 6s are filled is clacium.

Answer:

C

Explanation:

Here's an example of displacement reaction:

2 Al (s) + 3 CuSO4 (aq) -> 3 Cu (s) + Al2(SO4)3 (aq)

note that aluminium and copper are elements,

copper II sulphate and aluminium sulphate are compound

The statement that best describes displacement reaction is an element and a compound react to form a different element and compound. The correct option is C.

When a more reactionary element displaces, or continues to push out, a less reactive element from a compound containing the less reactive element, a displacement reaction occurs.

The less reactive element is now pure and uncombined following a displacement reaction.

A single-displacement reaction occurs when a more reactive element in a compound replaces a much less reactive element.

Metal displacement, hydrogen displacement, and halogen displacement are the three types of displacement reactions.

An element as well as a compound react to form a specific component and compound, according to the best description of displacement reaction.

Thus, the correct option is C.

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Answer:

Given theoretical yield of NH3 is 945g.

The actual yield is 598g.

What is the %yield?

Explanation:

%yield of a chemical reaction can be calculated by using the formula:

[tex]%yield=\frac{actual yield}{theoretical yield} * 100[/tex][tex]\frac{actual yield}{theoretical yield} * 100[/tex]

Substitute the given values in this formula to get the %yield.

[tex]\frac{598g}{945g} * 100\\=63.3[/tex]

Hence, the %yield for the formation of ammonia is ---- 63.3.

Answer:

35.9%

Explanation:

The percent volume of the coffee solution can be calculated as follows:

% volume of coffee solution = volume of coffee/total volume of coffee solution × 100

According to this question, a cup of coffee has 71 mL of coffee and 127 mL of water. This means that, the total volume of coffee solution is;

71mL + 127mL = 198mL

% volume = 71/198 × 100

= 0.359 × 100

Percent volume of coffee solution = 35.9%

Answer:

va/c = v a/b + v b/c

Explanation:

This is the correct formula for relative velocity

Answer:

Explanation:

from the way the trees look, i would say A: Wind from the sky, it seems B: Clouds and in the distance C:Precipitation(rain)

Answer:

1. 78.9g of CO

2. 104.9g Fe and 124.0g CO2

Explanation:

Based on the balanced reaction:

Fe2O3 (s) + 3CO (g) -> 2Fe(s) + 3CO2 (g)

1 mole of Fe2O3 reacts with 3 moles of CO to produce 2 moles of Fe and 3 of CO2

1. The moles of 0.150kg = 150g of Fe2O3 -Molar mass: are:

150g * (1mol / 159.69g) = 0.9393 moles Fe2O3

Moles CO:

0.9393 moles Fe2O3 * (3mol CO / 1mol Fe2O3) = 2.818 moles CO

Mass CO -Molar mass: 28.01g/mol-:

2.818 moles CO * (28.01g/mol) = 78.9g of CO

2. The moles of Fe produced are:

0.9393 moles Fe2O3 * (2mol Fe / 1mol Fe2O3) = 1.8786 moles Fe

Mass Fe -Molar mass: 55.845g/mol-:

1.8786 moles Fe * (55.845g/mol) = 104.9g Fe

The moles of CO2 produced are:

0.9393 moles Fe2O3 * (3mol CO2 / 1mol Fe2O3) = 2.818moles CO2

Mass CO2 -Molar mass: 44.01g/mol-:

2.818moles CO2 * (44.01g/mol) = 124.0g CO2

Answer:

"soot" or "smoke" or "particulates" or "ash" or "carbon particulates"

Explanation:

The carbon that does not undergo combustion is released as particles. This  particles are called soot or dust. Incomplete combustion also leads to the production carbon monoxide.

Combustion is an exothermic process in which a gas reacts with the atmospheric oxygen producing carbon dioxide and water. This reaction involves heat to the surroundings.

Sometimes the combustion does not occurs completely. When there is insufficient oxygen for the fuel to completely react with the air to form carbon dioxide and water leads to  incomplete combustion. It also occurs when a heat sink, such a solid surface or flame trap, extinguishes the combustion.

One of the byproducts of incomplete combustion is carbon monoxide. The typical incomplete combustion process releases carbon, which results in the formation of soot and dust.

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Answer:

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

Explanation:

Una ecuación de reacción química es una representación simbólica de lo que sucede en un recipiente de reacción.

Al escribir la ecuación de reacción química para una reacción particular, se utilizan los símbolos químicos de todas las especies involucradas.

Por la reacción. en el cual dos moléculas de Clorato de Potasio en estado sólido, al aplicar calor se descompone en dos moléculas de Cloruro de Potasio en estado sólido y tres moléculas diatómicas de Oxígeno en estado gaseoso, la ecuación de reacción se escribe así;

2KClO3 (s) -------> 2KCl (s) + 3O2 (g)

La regla para escribir ecuaciones de reacción química balanceada es que el número de átomos de cada elemento en el lado derecho de la ecuación de reacción debe ser el mismo que el número b de átomos del mismo elemento en el lado izquierdo de la ecuación de reacción.

Si realizamos un conteo de átomos simple en ambos lados de la ecuación de reacción, la regla se cumple

Answer:

The answer is 1 x 10 - 11 M.  :))