What is true about the atoms at the start of a chemical reaction compare to the atoms at the end of a net reaction?

They give us the grams of solute and the molarity of the solution. To find the liters we must take into account the definition of molarity. Molarity is defined as:

The definition of molarity asks us for the moles of solute, so we must pass the grams that give us to moles. For them, we divide the 500 grams by the molar mass of MgF2. The molar mass of MgF2 is 62.3018g/mol.

The moles of MgF2 will be:

Now, we find the liters of solution:

Answer: It must be present 3L of solution

The role of the force of gravity and/or fusion force in the formation of new stars form from a hydrogen and dust cloud is by providing the required force and conditions needed for the reaction.

This is referred to as an astronomical object which has a luminous spheroid of plasma which is held together by its gravity.

In the formation of stars, the fusion force helps in the initiation of the nucleosynthesis reaction which occurs. The outward pressure from heating of the gas must balance gravity for a new star to be formed thereby making it the correct choice.

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Answer:

2.95 L

Explanation:

To find the new volume, you need to use the Charles' Law equation:

V₁ / T₁ = V₂ / T₂

In this equation, "V₁" and  "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. Since you want your final volume in liters, you first need to convert 3,500 mL to L. Then, you need to convert the temperatures from Celsius to Kelvin. Finally, you can plug the given values into the equation and simplify to find "V₂".

V₁ = 3,500 mL / 1,000 = 3.5 L               V₂ = ? L

T₁ = 80°C + 273 = 353 K                         T₂ = 25°C + 273 = 298 K

V₁ / T₁ = V₂ / T₂                                      <----- Charles' Law equation

(3.5 L) / (353 K) = V₂ / (25°C)                <----- Insert values

0.00992 = V₂ / (298 K)                         <----- Divide left side

2.95 = V₂                                               <----- Multiply both sides by 298 K

Thermal energy in a circuit comes from the electrical energy that is transformed into heat. It is observed in resistors, capacitances and inductances.

The electrical energy in a circuit is converted into heat by the thermal energy. It relies on the sort of circuit under evaluation, which in turn depends on the circuit's components. These elements include resistors, capacitances, and inductances—individually or in combination.

The sum of the squares of the current, resistance, and power dissipated. The impedance of the circuit must be computed for an LCR circuit. then utilizing the impedance, the circuit's current may be estimated.

P=V^2/R

Hence, the thermal energy in a circuit is observed in resistors, capacitances and inductances.

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We want the mass of NaOH, Given:

V = 27.0 mL = 0.0270 L

C = 2 M

Given the concentration and volume we can find the number of moles of NaOH, and then convert it to mass.

C = n/V (or Molarity = moles of solute/litres of the solution) where C is the concentration or molarity, n is the number of moles of the solute and V is the volume of the solution

n = Cv

n = 2 x 0.0270 L

n = 0.054 mol

Now that we have the number of moles, we can get the mass of NaOH. Molar mass of NaOH = 39,997 g/mol

n = m/M where m is the mass and M is the molar mass

m = nM

m = 0.054 mol x 39,997 g/mol

m = 2.16 g

The concentration of fluoride ions after the addition of 10.00 mL of 0.0100 M HCl to 25.0 mL of this solution is 0.009 M

One of the terms for concentration that is used frequently in solutions would be molarity. It would be explained as the number of moles of solute in one liter of solution.

Molarity can be determined by the formula:

Molarity = moles of solute/ volume of solution

Moles of the HCl can be determined by using the formula:

Moles of solute = molarity × volume of the solution.......(i)

It is given that,

Molarity = 0.0100 M.

Volume = 10.0 mL .

Put the value of given data in above equation:

Moles of solute = (0.0100 M) × (10.0 mL) ×([tex]10^{-3}[/tex]/1 mL)

Moles of solute =  [tex]10^{-7}[/tex] M

Now, determine moles of HF.

Moles of solute = (0.126 M) × (25 mL) ×([tex]10^{-3}[/tex]/1 mL)

Moles of solute = 0.00315 M

Total moles = 0.00315 M + 0.0000001 M =0.0031501 M

Total volume = 10.00 mL + 25 mL = 35 mL.

Molarity can be determined by the formula:

Molarity = moles of solute/ volume of solution

Molarity = 0.0031501 M / 35 (1/[tex]10^{-3}[/tex])

Molarity = 0.009 M

Therefore, molarity will be 0.009 M.

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Thermal energy is transferred from a hot body (higher temperature) to a colder body (lower temperature). In these energy exchanges, two types of changes are observed: temperature or physical state. These variations occur both with energy intake and loss. What is being transferred between the two bodies is heat.

Answer: A. Heat.

The quantum numbers that are not possible are 16,14,15.

The quantum numbers are used to address the position of the electron in an atom. They are the set of numbers that show the most probable position of the electron in an atom. There are four sets of quantum numbers that describe the position of an electron and they are;

1) Principal quantum number

2) Orbital quantum number

3) Magnetic quantum number

4) Spin quantum number.

The set of quantum numbers 16,14,15 is not possible because ml must have values of -l to +l as we know.

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Zero on the Kelvin scale corresponds to absolute zero this statements about temperature scales is correct

Using a beginning point (0 or zero) and a unit of measurement, a temperature scale can be used to indicate or measure temperature. This is typically accomplished by designating certain physical events as occurring at 0 and 100 degrees Fahrenheit, respectively, at specific temperatures, such as the freezing and boiling points of water.

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Answer:

Explanation:

Here, we want to calculate the pressure used at the new volume

It is expected that at a higher pressure, the volume will decrease

Thus, the weight and the pressure are inversely proportional

Mathematically:

The above is according to Boyle's law which states that volume and pressure are inversely proportional

where:

V1 is the initial volume which is 4 cc

P1 is the initial weight which is 600 g

V2 is the final volume which is 2.5 cc

P2 is the final pressure which is unknown

Substituting the values:

Answer

acids and bases are both corrosive furthermore both will conduct electricity depending on the strength of the acid or base

C is the correct option

The existence of isotopy shows that the atoms of the same element are not exactly alike.

Recall that the atom is the simplest particle of a substances that is able to take part in a chemical reaction. Note that the empirical study of the atom became much more common after the study of John Dalton that led to the Dalton Atomic Theory.

Now, one of the postulates of the theory is the atoms of the same elements are exactly alike in all respects and are different from the atoms of other elements. The existence of isotopy have shown that the atoms of the same element could be different and behave slightly differently from each other.

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We start by counting the number of atoms of each element on each side of the reaction.

Now we balance the reaction by trial and error, starting with chlorine. We have 2 chlorine atoms in the reactants and 3 clear atoms in the products, so to balance we cross the coefficients placing 3 on the reactant side and two on the product side in the respective molecules:

Now we continue with the oxygens, we have 3 oxygens on the reactant side and 1 on the products, so we put the coefficient 3 on the products side in front of the respective molecule:

We now have the balanced equation. We have 3 Mg atoms, 6 Cl atoms, 2 Cr atoms, and 3 O atoms on each side of the reaction.

The pH of the solution is calculated as 7.2.

Let us recall that we can make us of the Henderson–Hasselbalch equation

to obtain the pH of the solution if we would follow the steps that have been itemized below.

Number of moles of the acid = 500/1000 L * 0.20 M = 0.1 moles

Number of moles of salt =  500/1000 L * 0.1 M = 0.05 moles

Total volume of the solution = 500 mL + 500 mL = 1000 mL or 1L

Now;

Molarity of the acid = 0.1 moles/1 L = 0.1 mol L-1

Molarity of the salt = 0.05 moles/1 L = 0.05 molL-1

Then we apply the equation;

pH = pKa + log[(A-)/(HA)]

pKa = - log (Ka) = - log(3.2 × 10^–8) = 7.5

Thus we have;

pH = 7.5 + log (0.05/0.1)

pH = 7.5 - 0.3

pH = 7.2

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Answer:

The difference between chemical and physical equilibrium. Physical is a reversible change of state. Chemical is a reversible chemical reaction that can go in the direction to create products or to create reactants.

A physical equilibrium is an equilibrium state in which the physical state of the system does not change. Chemical equilibrium is the equilibrium state in which the concentrations of reactants and products is not changed with time.

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The planet, known as Proxima b, may be warm enough for liquid water to exist on its surface and hence be suitable for life because it is located within the star's "habitable zone."

Applying Kepler's laws: The sun is at the centre of elliptical planetary orbits, according to the first law. Second Law: The radius vector from the sun to a planet covers the same area in exactly the same amount of time. Third Law: For every planet, there is a constant relationship between the cube of the elliptical semimajor axis and the square of the period of revolution.

Since the angular momentum is changing at a rate of zero, the angular momentum must be constant, which implies that the rate of change of the swept-out area for the celestial body's orbit must also be constant. This leads to Kepler's Second Law, which states that celestial objects in orbit cover equal regions in similar amounts of time.

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From the calculations, the molarity of the iodine solution is 0.025 M and the mass of the arsenic oxide solution is 0.066 g.

Let us recall that the molarity is defined as the ratio of the number of moles to the volume of the solution. It is a measure of the amount of substance present. Ley us now try to use what we know to obtain the molarity of the solution in each of the cases of the questions.

a) Using;

CAVA/CBVB = NA/NB

CA = Amount of thiosuphate

CB = Amount of iodine

VA = volume of thiosuphate

VB = volume of iodine

NA = number of moles of thisulphate

NB = Number of moles of iodine

Hence;

0.1047 M * 18.59 mL/CB * 38.62 mL = 2/1

0.1047 M * 18.59 mL * 1 = CB * 38.62 mL * 2

CB = 0.1047 M * 18.59 mL * 1 /38.62 mL * 2

CB = 1.946/77.2

CB = 0.025 M

b) Using the formula;

Number of moles = concentration * volume

Number of moles = 0.025 M * 26.64 /1000 L

= 6.66 * 10^-4 moles

Again;

1 mole of the arsenic oxide reacts with 2 moles of iodine solution

x moles of the arsenic oxide reacts with 6.66 * 10^-4 moles of iodine

x = 1 mole *  6.66 * 10^-4 moles/ 2 moles

x = 3.33  * 10^-4 moles

Mass of the arsenic oxide = 3.33  * 10^-4 moles * 197.8 g/mol

= 0.066 g

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ANSWER

EXPLANATION

Krypton is an example of a noble gas. Noble gases are not reactive because their octet state has been completely filled. Krypton belongs to group 0 or 18.

Since the octet state is completely filled, then the number of electrons at the outermost shell is 8

Therefore, the valence electrons of Krypton is 8

The electronic configuration of the valence electron is written below as

Answer

By adding water (H2O)

Explanation

In this reaction, water is a product, adding the product will favour the reverse reaction, which is the formation of more Co(H2O)6^2+.

The mass of aluminum metal that reacts to form 2.80 g of iron according to the reaction would be 0.9017 g.

The percent yield of the reaction if 0.450 g of potassium chlorate reacts according to the equation would be 87.05%.

Consider the first reaction:

[tex]3 FeO (l) + 2 Al (l) -- > 3 Fe (l) + 1 Al_2O_3[/tex]

The mole ratio of Al and Fe is 2:3.

2.80 g of Fe = 2.8/55.85

                    = 0.0501 moles

Equivalent mole of Al = 2/3 x 0.0501

                              = 0.0334 moles

Mass of 0.0334 moles Al = 0.0334 x 26.98

                                        = 0.9017 g

Consider the second reaction:

[tex]2 KCIO_3 (s) -- > 2KCl (s) + 3 O_2[/tex]

The mole ratio of potassium chlorate to oxygen is 2:3.

Mole of 0.450 g potassium chlorate = 0.450/122.55

                  = 0.0037 moles

Equivalent moles of oxygen = 3/2 x 0.0037

                           = 0.0056 moles

Mass of 0.0056 moles oxygen = 0.0056 x 32

                                   = 0.1792 g

Percent yield = 0.156/0.1792 x 100

                = 87.05%

In other words, the mass of aluminum metal that reacts in the first reaction would be  0.9017 g while the percent yield of the second reaction is 87.05%.

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We have a neutralization between the HCl (acid) and Ba(OH)2 (base):

To calculate the mL asked, we need to use the next formula:

M1 x V1 = M2 x V2 (1)

We assign number 1 to HCl and number 2 to Ba(OH)2

Remember: M molarity and V volume

-----------------

Data:

We know M1 = 0.165 M (HCl) and M2 = 0.101 M, V2 = 25.0 mL.

-----------------

Procedure:

We clear V1 from (1):

V1 = M2 x V2/M1 = 0.101 M x 25.0 mL/0.165 M = 15.3 mL

Answer: V1 = 15.3 mL

Answer: The oxidation states can be labelled as:

- In Fe2O3: Fe = +3, O = -2

- In CO: C = +2, O = -2

- In Fe: Fe = 0

- In CO2: C = +4, O = -2

Fe is being reduced (changes from +3 to 0) and C is being oxidized (changes from +2 to +4).

Explanation:

The question requires us to label the oxidation states of each element in the following chemical equation, and then determine which one is being oxidized and which one is being reduced.

To solve this problem, we need to keep in mind a few points:

- oxidation occurs when its oxidation number increases (the element "loses" an electron);

- reduction occurs when its oxidation number decreases (the element "gains" an additional electron);

- the oxidation number of some elements is usually the same; a good example is oxygen (O): in most cases, O presentes oxidation number equals to -2.

Next, let's analyze the oxidation numbers of the elements in the reaction:

- Fe2O3: since O has oxidation number = -2, in the compound Fe2O3 the total charge brought by O is (-2) * 3 = -6, thus 3 atoms of Fe must have charge +6. We can say Fe has oxidation number = +3 in Fe2O3 (because (+3) * 2 + (-2) * 3 = 0).

- CO: O has oxidation number = - 2, thus C must present oxidation number = +2 in CO.

- Fe: Elementar Fe presents oxidation number = 0;

- CO2: Since O has oxidation number = -2, C must present oxidation number = +4 (because (+4) * 1 + (*2( * 2 = 0.

Thus, the oxidation states can be labelled as:

- In Fe2O3: Fe = +3, O = -2

- In CO: C = +2, O = -2

- In Fe: Fe = 0

- In CO2: C = +4, O = -2

Analyzing the oxidation states in the reactants (left side) and products (right side), we can see that Fe goes from +3 to 0, thus it is being reduced, while C goes from +2 to +4, thus it is being oxidized.

First, we have to remember what a mass percentage means (in this particular case):

It is the amount of each element in a compound, and it is calculated as follows:

The addition of the different mass percentages is equal to 100%.

In this case, we have the percentage of one of the elements of the compound, we can make the respective subtraction:

Then, the answer is that the iodine mass percentage is 86.4%

Solutions :

We are given

• mass of potassium = 2.75 g

• Recall that 1 mole of potassium = 39.0983 grams

So , 2.75 g will represent

The effect of acid you think is most important because chemical that can donate a hydrogen ion to other molecule

Acid is an that in water solution taste sour and changes blue litmus to red and react to some metal to liberate hydrogen react with bases to form salt and and also promote chemical reaction and the effect of acid is the chemical that can donate hydrogen ion to other molecule and the result in other molecule changing shape and possibly breaking apart

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Answer:

Explanations:

a) The balanced chemical reaction for the complete combustion of pentane is expressed as:

Note that oxygen, carbondioxide and water are all in gaseous state.

This organic compound has in its structure the next element: C, H, and O

45.27% C

4.43 % H

The rest 100%-45.27%-4.43 = 50.3 % O

-----------------------------------------------------------------------------------------------------------------

The empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound.

Procedure:

Step 1)

We convert % into grams (g). Let's assume we have a 100g sample. Therefore,

45.27 % C = 45.27 g

4.43 % H = 4.43 g

50.3 % O = 50.3 g

Step 2)

We calculate the number of moles of each element. To do this, we need every atomic mass

For C)

For H)

For O)

Step 3)

We divide all moles by the smallest one of them (3.14 moles of O)

For C) 3.767 moles/3.14 moles = 1.19 = 1 (we need integer numbers)

For H) 4.43 moles/3.14 moles = 1.41 = 1

For O) 3.14 moles/3.14moles = 1

The empirical formula is CHO

When something heats up energy is absorbed from another system and when something cooler down energy is released to another system.

When a reaction releases heat, it is classified as exothermic. The absorption of heat in a reaction makes it endothermic.

The balanced equation of the reaction is:

CoCl2 + F2 → CoF2 + Cl2

Now, we will follow the next steps to solve the question.

1. We find the moles present in 124.13 g of cobalt(II)fluoride (CoF2) using the molar molar mass of CoF2. The molar mass of CoF2 is: 96.93g/mol

2. By stoichiometry we find the moles of fluorine (F2) needed. Since the ratio CoF2 to F2 is 1, the moles will be the same as those produced from cobalt(II)fluoride.

3. We find the grams of fluorine by multiplying the moles by the molar mass of fluorine. The molar mass of fluorine is 38.00 g/mol

Let's proceed with the calculations:

1. Moles of CoF2

2. Moles of F2

3. Grams of F2

Answer: To produce 124.13 grams of cobalt(II)fluoride are required 48.66grams of fluorine

Answer: CHOCH

The third one

Explanation: