if a molecular formula is C8H12O2, what is the empirical formula

The compound is formed by addition reaction. The product is showed in the image attached.

The term addition reaction refers to a type of reaction in which a compound is added across the multiple bond. In this case, the iodine molecule is added to the olefinic bond as shown.

The structure of the product formed has been attached to this answer. The product is formed by addition across the double bond.

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Answer:

false

Explanation:

Explanation:

Lewis Dot Diagrams are represented by the element name in the middle, the same as in the periodic table, and is surrounded by dots that represent the elements valence electrons.

To predict the spontaneity of an oxidation-reduction reaction, we can use the concept of redox potentials.

Each oxidation and reduction half-reaction has an associated redox potential, which is a measure of the tendency of the reaction to occur. The difference between the redox potentials of the oxidation and reduction half-reactions is called the cell potential (Ecell) and is a measure of the overall tendency of the reaction to occur.

If the Ecell value is positive, then the reaction is spontaneous (i.e., it will occur without the need for external energy input). If the Ecell value is negative, then the reaction is non-spontaneous (i.e., it will not occur without the input of external energy).

We can predict the Ecell value of an oxidation-reduction reaction using the Nernst equation:

Ecell = E°cell - (RT/nF) * ln(Q)

where E°cell is the standard cell potential (i.e., the cell potential under standard conditions), R is the gas constant, T is the temperature, n is the number of electrons transferred in the reaction, F is Faraday's constant, and Q is the reaction quotient (which depends on the concentrations of the reactants and products).

If the calculated Ecell value is positive, then the reaction is spontaneous, and if it is negative, then the reaction is non-spontaneous.

4. The process which leads to transition from the above task are as follows:

5. The two processes that cause transition from each given below:

6. The major reason why water shortages are the problems for many people around the world is simply because of climatic change which alters the weather of a given place at a period of time, thereby leading to water insufficiency.

Melting refers to a chance of state of matter which refers to the process whereby a solid substance changes to liquid.

From the context of the above task, river ice melts into river in a process known as melting.

In conclusion, we can now deduce from the explanation given above that transition is a process which involves the change in form of matter.

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Explanation:

The reaction:

N2O4(g) <=> 2NO2(g)

Inicially 0 [1 mol/Volume]

Reacts +x -2x

Equilibrium +x [1 mol/Volume]-2x

[1 mol/Volume] means molarity

In a chemical reaction, chemical equilibrium is the state in which the forward reaction rate and the reverse reaction rate are equal. The result of this equilibrium is that the concentrations of the reactants and the products do not change.

Therefore, the answer: Some N2O4 and some NO2

The molar mass of CaF2 can be calculated as follows:

M(CaF2) = M(Ca) + M(F) x 2

= 40.08 g/mol + 18.998 g/mol x 2

= 78.076 g/mol

Therefore, one mole of CaF2 has a mass of 78.076 g.

To determine the amount of F in 425 g of CaF2, we need to first calculate the number of moles of CaF2 in 425 g:

n(CaF2) = m(CaF2) / M(CaF2) = 425 g / 78.076 g/mol = 5.44 mol

Next, we can use the stoichiometry of the formula CaF2 to determine the number of moles of F in 5.44 mol of CaF2:

1 mol of CaF2 contains 2 moles of F

Therefore, n(F) = 2 x n(CaF2) = 2 x 5.44 mol = 10.88 mol

Finally, we can convert the number of moles of F to grams of F by multiplying by the molar mass of F:

m(F) = n(F) x M(F) = 10.88 mol x 18.998 g/mol = 206.98 g

Therefore, there are 206.98 grams of F in 425 g of CaF2.

Answer:

1.396 x \(10^{7}\) yards

Explanation:

The Earth has a spherical shape, thus its diameter is a straight line that passes through its center; dividing into two equal halves.

Given that the diameter of the earth is 1.276 x \(10^{7}\) meters.

But,

1 meter = 1.09361 yards

So that,

1.276 x \(10^{7}\) meters = x

⇒ x = 1.276 x \(10^{7}\) x 1.09361

               = 1.39545 x \(10^{7}\) yards

The diameter of the earth is 1.396 x \(10^{7}\) yards.

A Class A burette is a type of laboratory glassware used for precise volumetric measurements of liquids.

This burette is a graded glass tube with a glass tip at one end. It is utilized to dispense liquids in predetermined quantities. Most experiments requiring titration use a burette.

It is typically made of borosilicate glass and has a long, narrow, cylindrical shape with a stopcock at the bottom for dispensing the liquid. The burette is usually graduated in milliliters (mL) with the smallest graduation being 0.1 mL.

Class A burettes are manufactured and tested according to strict standards set by organizations such as the National Institute of Standards and Technology (NIST) in the United States, and the International Organization for Standardization (ISO) globally.

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Answer:

0.0878 moles CaCl₂

Explanation:

To find the amount of moles of CaCl₂, you need to

(1) convert the volume from mL to L (1,000 mL = 1 L)

(2) calculate the amount of moles (M = moles / L)

It is important to arrange the conversions in a way that allows for the cancellation of units.

(Step 1)
   

  42 mL CaCl₂                    1 L
------------------------  x  ----------------------  =  0.042 L CaCl₂
                                       1,000 mL

(Step 2)

Molarity (M) = moles / volume (L)                <----- Molarity ratio

2.09 M = moles / 0.042 L                            <----- Insert values

0.0878 = moles                                           <----- Multiply both sides by 0.042 L

Hg = (3.2 : 4.2) x 100% = 76.19%

O = (1 : 4.2) x 100% = 23.81%

Answer:

unit cells; lattice

Explanation:

Answer:

C) Shell 1-8, Shell 2=2, Shell 3=8, Shell 4=18

GIVEN

• Mass of Al2O3 =, 408g

• Molecular mass Al2O3 =,101,96 g/mol

• Molecular Mass Oxygen =,15,999 g/mol

We will consider the following balanced chemical equation that takes place :

3 moles Oxygen reacts and produce 2 moles Al2O3

So, x moles Oxygen willreact and produce 4 moles Al2O3

Therefore,

X moles O2 = (4Moles Al2O3 *3 moles Oxygen ) / 2 moles Oxygen

= 6 moles of O2

(iii) Determine Mass of Oxygen :

Therefore, 95.99 grams of O2 are needed to produce 408g of Al2O3

What causes an electron in an atom to move to a higher energy level it that it absorbs a specific amount of light energy. C

An atom is in its excited state when it moves from a lower energy level to a higher energy level by absorbing a specific amount of light energy.

If an atom is in a lower energy state, it is said to be in its ground state.

Thus, what causes an electron in an atom to move to a higher energy level it that it absorbs a specific amount of light energy

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The reaction can be said to be at equilibrium when the reaction rates of making products and using reactants are equal.

When the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products don't change over time, a chemical reaction is said to be in equilibrium.

When the system reaches equilibrium, it is in a state of balance, which means that the concentrations of the reactants and products have not changed significantly.

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The statistical rule of thumb to determine an adequate sample size include the following: E. A statistical power level of 80 percent.

In Mathematics and Statistics, sampling can be defined as a process that is typically used for the collection or selection of data (physical objects, observations, or individuals) from a larger statistical population, especially by using specific procedures and processes.

In Mathematics and Statistics, a sample proportion can be defined as the proportion of individuals in a sample that have a specified characteristic or trait.

Mathematically, the sample proportion of a sample can be calculated by using this formula:

\(\hat{p} = \frac{x}{n}\)

Where:

In Mathematics and Statistics, a statistical power level of 80 percent (80%) is a statistical rule of thumb that is generally used in determining an adequate sample size.

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If the potassium atoms could be lined up in a row, it would take to make a 1.00 ft row of potassium atoms is 5.45 × 10⁻⁸.

Potassium atom is represented by K with atomic number 19. It is a silvery white metal.

Given,

Radius = 280pm = 280 × 10⁻¹²m

Diameter = 2radius = 560× 10⁻¹²m = 560pm

We know that,

1 feet = 0.305m

So, number of potassium atoms that fits into the row,

1 feet = 0.305/560 × 10⁻¹²

1 feet = 5.45 × 10⁻⁸

Hence, it takes 5.45 × 10⁻⁸ atoms of potassium to make a 1 feet row.

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isabel is represented as x

ruth is represented as x+2

so the equation would be

x+(x+2)=22

the (x+2) is ruth. so to check if its right solve it. 2x+2=22

-2 -2

2x+20

__ ___

2 2

x=10

so now you know that isabel scored 10 goals since she was x. to figure out ruth just add 2.

The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

The correct answer is c. Distillation

Explanation:

The volatility of a substance refers to the tendency to vaporize. The more volatility, more readily the substance vaporizes and passes from liquid state to gas state.

From the options, the only operation that separes substances by their tendency to vaporize is distillation. In distillation, evaporation and condensation processes at different temperatures are used to separe miscible liquid substances.

Therefore, the correct option is c. Distillation

Answer:

C. Distillation

Explanation:

EDGE2021

Answer:

when placed in water, a sodium pellet catches on fire as hydrogen gas is liberated and sodium hydroxide forms. chemical change = fire is a sign of chemical reaction.

Explanation:

When placed in water the sodium pellets catch the fire and liberate the hydrogen gas. On mixing with water solid sodium forms a colorless basic solution.

Sodium is a soft metal. It is a very reactive element with a low melting point. Sodium reacts very quickly with water, snow, and ice to produce sodium hydroxide and hydrogen. It is an alkali metal and the sixth most abundant metal on earth. It has a silvery white color.

It has a strong metallic luster. On reacting with oxygen it produces sodium oxide which on reacting with the water produces sodium hydroxide.

It is used to improve the structure of certain alloys and soaps. It is also used in the purification of metals. Sodium is also present in sodium chloride, an important compound found in the environment.

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Answer: letter C ("Simply rearrange during the reaction to form new molecules").

Explanation:

The question requires us to choose, among the options given, which one correctly represents what happens to atoms when they participate in a chemical reaction.

A chemical reaction involves the breaking of bonds between the reactants molecules (or particles) and the formation of new bonds to obtain the products.

In a balanced chemical reaction, the number of atoms in reactants and products is the same, thus we can affirm that the atoms that exist in the beginning of the reaction are not lost or transformed in completely new atoms. Although a chemical reaction may release energy, this energy is the result of breaking and forming new bonds.

A catalyst is a substance that is able to increase the rate of the reaction without taking part in the process of the reaction (the catalyst should not go through any permanent change during the reaction). Therefore, the catalyst is not able to replace atoms in the chemical reaction.

Considering what happens in a chemical reaction, we can say that the atoms present at the beginning of the reaction are rearranged in order to yield the products of the reaction.

Therefore, considering the information above, the best option to answer the question is letter C ("Simply rearrange during the reaction to form new molecules").

\(\\ \tt\leadsto \dfrac{d[NH_3]}{dt}=1.50\times 10^{-6}\)

\(\\ \tt\leadsto \dfrac{d[H_2]}{dt}=\dfrac{3}{2}\dfrac{d[NH_3]}{dt}\)

\(\\ \tt\leadsto \dfrac{d[H_2]}{dt}=\dfrac{3}{2}(1.5\times 10^{-6})\)

\(\\ \tt\leadsto \dfrac{d[H_2]}{dt}=2.25\times 10^{-6}Ms^{-1}\)

M is molarity here not metre

The average rate of appearance of H2 over the time period from t = 0 s to \(\rm t = 5.48\times10^3 s\ is\ 2.25\times10^{-6}\) M/s.

To find the average rate of appearance of \(\rm H_2\), we can use the stoichiometry of the reaction to relate it to the rate of disappearance of \(\rm NH_3\).

From the balanced equation: \(\rm 2NH_3(g) - > N_2(g) + 3 H_2(g)\)

We can see that for every 2 moles of \(\rm NH_3\) that disappear, 3 moles of \(\rm H_2\) appear.

Given that the average rate of disappearance of \(\rm NH_3\ is\ 1.50\times10^{-6} M/s\), we can calculate the average rate of appearance of \(\rm H_2\) as follows:

Average rate of appearance of \(\rm H_2\) = (3/2) x (Average rate of disappearance of \(\rm NH_3\))

Average rate of appearance of \(\rm H_2\) = (3/2) x \(\rm (1.50\times10^{-6} M/s)\)

Average rate of appearance of \(\rm H_2\) = \(\rm 2.25\times10^{-6} M/s\)

Therefore, the average rate of appearance of \(\rm H_2\) over the time period from t = 0 s to \(\rm t = 5.48\times10^3 s\ is\ 2.25\times10^{-6}\) M/s.

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No se si aun necesitas ayuda o no