if the ea for the forward reaction is 25 kj/mol and the enthalpy of reaction is -95 kj/mol, what is ea for the reverse reaction?

Answer:

The biodiversity of an area is literally the number of species, both plant and animal, inhabiting the environment being examined.  When a species is no longer found in a region, it is locally extinct.

Explanation:

Answer:

Its weight changes based on location, but its mass stays the same.

Explanation:

See attached worksheet.

Answer:

A.

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Given:   4 mol Mg(OH)₂

RxN:   MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Molar mass of O - 16.00 g/mol

Molar mass of H - 1.01 g/mol

Molar Mass of KOH - 39.10 + 16.00 + 1.01 = 56.11 g/mol

Step 3: Stoichiometry

\(4 \ mol \ Mg(OH)_2(\frac{2 \ mol \ KOH}{1 \ mol \ Mg(OH)_2} )(\frac{56.11 \ g \ KOH}{1 \ mol \ KOH} )\)

Answer:

check the attachment/picture below!

Explanation:

I had just taken that quiz! :D

Answer:

a. The gluing together of any two atoms that don't have full outer shells.

b. The separation of electrons from the main atom.

c. The joining of atoms by a shared interested of valence electrons which ends up

creating new substances.

d. The melting of substances to form new solids.

Explanation:

a. The gluing together of any two atoms that don't have full outer shells refers to chemical bonding, which can occur through different mechanisms such as covalent bonding, ionic bonding, and metallic bonding.

b. The separation of electrons from the main atom refers to ionization, where an atom or molecule loses or gains one or more electrons and becomes charged.

c. The joining of atoms by a shared interest of valence electrons which ends up creating new substances refers to covalent bonding, where atoms share electrons to form a stable molecule.

d. The melting of substances to form new solids does not necessarily create new substances; it is a physical change where a solid is transformed into a liquid due to an increase in temperature. Upon cooling, the liquid may solidify again, either forming the original substance or a different solid phase.

The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it.

The oxidation number of the  atom is the number that will represents the total number of the electrons lost or the gained by it. The free element has an oxidation number that is equal to zero. For the monoatomic ions, the oxidation number will always be has the same value as the charge related  to the ion.

The hydrogen atom (H) will exhibits an oxidation state of the +1. The Oxygen has the oxidation of the -2 in most of the compounds. All the alkali metals that have the oxidation state of the +1 in the alkali compounds.

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Answer:

11.9 g of nitrogen monoxide

Explanation:

We'll begin by calculating the number of mole in 6.75 g of NH₃. This can be obtained as follow:

Mass of NH₃ = 6.75 g

Molar mass of NH₃ = 14 + (3×1)

= 14 + 3

= 17 g/mol

Mole of NH₃ =?

Mole = mass /molar mass

Mole of NH₃ = 6.75 / 17

Mole of NH₃ = 0.397 mole

Next, we shall determine the number of mole of NO produced by the reaction of 0.397 mole of NH₃. This can be obtained as follow:

4NH₃ + 5O₂ —> 4NO + 6H₂O

From the balanced equation above,

4 moles of NH₃ reacted to produce 4 moles of NO.

Therefore, 0.397 mole of NH₃ will also react to produce 0.397 mole of NO.

Finally, we shall determine the mass of 0.397 mole of NO. This can be obtained as follow:

Mole of NO = 0.397 mole

Molar mass of NO = 14 + 16 = 30 g/mol

Mass of NO =?

Mass = mole × molar mass

Mass of NO = 0.397 × 30

Mass of NO = 11.9 g

Thus, the mass of NO produced is 11.9 g

Since the volume decreased, it means that the pressure is going to rise. Thus, the equilibrium of the reaction will shift in the direction that has the least amount of moles.

The statement, that describes the equilibrium "will change in the direction with the minimum moles."

A condition of equilibrium has become one of balance. Chemical equilibrium is the state in which both the reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.

When volume decreases, the equilibrium shifts to favor the direction that produces fewer moles of gas. When the volume is raised, the equilibrium shifts in favor of the direction that produces the most moles of gas. Because the container's volume will be lowered from 5.0 L to 3.0 L, the pressure will rise. As a result, the equilibrium of the reaction will shift in the direction with the fewest moles. When the volume is reduced, the pressure rises. This demonstrates that a gas's pressure is inversely proportional to its volume.

Hence the correct answer is equilibrium will change in the direction with the minimum moles.

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Answer:

Law of constant composition

Answer:

trtytytytytytyt

Explanation:

Answer:

c

Explanation:

The molarity of the HCl solution is 5M and the correct option is option C.

Molarity is a unit of concentration measuring the number of moles of a solute per litre of solution.

Chemists primarily need the concentration of solutions to be expressed in a way that accounts for the number of particles that react according to a particular chemical equation. Since percentage measurements are based on either mass or volume, they are generally not useful for chemical reactions. A concentration unit based on moles is preferable.

Given,

Volume of NaOH = 50 ml

Concentration of NaOH = 1M

Volume of HCl = 10ml

Concentration of NaOH × Volume of NaOH = Concentration of HCl × Volume of HCl

1 × 50 = c × 10

Concentration of HCl = 5 M.

Therefore, the molarity of the HCl solution is 5M and the correct option is option C.

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Answer: The answers are A. Reactant elements and/or compounds rearrange to form chemically new products, B. Energy is absorbed when bonds are broken, and D. Energy is released when bonds are formed.

Explanation:

The statement that is true for all chemical reactions is "Reactant elements and/or compounds rearrange to  form chemically new products."

A chemical reaction refers to any combination of reactants to yield products.

A chemical reaction involves rearrangement of bonds in reactant molecules in order to yield product molecules.

The rearrangement of chemical bonds in reactants to yield products is characteristic of all chemical reactions.

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Answer:

Option c.

Explanation:

According to Newton's law, formula to solve this problem is:

F = m . a

Mass → 1000 kg

a → 3 m/s²

F = 1000 kg . 3m/s² →  3000 N

1 N = 1 kg .  m/s²  according to SI, Internation System of units.

Acids and bases are chemical substances with contrasting properties. Acids taste sour, turn litmus paper red, and have a low pH. Bases taste bitter, turn litmus paper blue, and have a high pH. When an acid and a base react, they form a salt and water, resulting in a neutral solution.

Acids and bases are fundamental concepts in chemistry. Acids have a sour taste, such as vinegar or lemon juice, and turn litmus paper red. They also have a low pH value, indicating a high concentration of hydrogen ions (H+). On the other hand, bases have a bitter taste, like soap or baking soda, and turn litmus paper blue.

Bases have a high pH value, indicating a low concentration of hydrogen ions and a higher concentration of hydroxide ions (OH-). When an acid and a base react, they undergo a neutralization reaction, resulting in the formation of a salt and water. The salt is composed of a cation from the base and an anion from the acid. The resulting solution is neutral, with a pH of 7. Examples of salts include sodium chloride (table salt) and calcium carbonate (chalk). Alkalis are a type of base that can dissolve in water, forming hydroxide ions.

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In this equation, ^(15)O represents the isotope oxygen-15, ^(15)N represents the resulting nitrogen-15 isotope, and e^+ represents the positron emitted during the decay process.

Oxygen-15, an artificially produced radioactive isotope, undergoes decay by emitting a single positron, which is a positively charged electron. The nuclear equation for this decay can be represented as ^15O → ^15N + e⁺, where ^15O denotes oxygen-15, ^15N represents the resulting nitrogen-15 isotope, and e⁺ denotes the emitted positron. This radioactive decay process occurs as the oxygen-15 nucleus transforms into a nitrogen-15 nucleus, simultaneously releasing a positron. Such decay pathways are commonly observed in isotopes that have an excess of protons in their nuclei, aiming to achieve a more stable configuration through the emission of particles.

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Ans 1:

Ammonia is not collected over water since it is highly soluble in water

Ans 2:

Ammonia gas is lighter than air and hence collected by the downward displacement of air.

Ans 3:

The carbon dioxide is very cold as it comes out of the extinguisher, so it cools the fuel as well.

Ans 4:

H₂SO₄ is not used in the preparation of carbon dioxide Because the calcium sulphate formed is insoluble in water. So, CO₂ will not form.

Ans 5:

The opening of hard glass test tube is slanted down during laboratory preparation of ammonia gas because Ammonia gas is not collected in the gas jar by upward displacement of air because it is lighter than air

Ans 6:

Magnesium is reactive enough to be combusted and oxidized in a reaction with carbon dioxide:

The magnesium strip burns brightly in the air, but continues to burn in the carbon dioxide environment

-TheUnkownScientist

1) There is a new product on the right hand side

2) Magnesium and oxygen

3) The stoichiometric coefficient of the reactants

4) The number of atoms of each of the elements in the molecule

5) At the start of the reaction, the elements are isolated while at the end of the reaction, the elements are combined.

We have to note that when we talk about a chemical reaction we mean the combination of two or more substances so that we can be able to get a product that is different from the reactants.

in this case, we can see that the reaction that has taken place is the combination of the oxygen molecule and the magnesium atom so as to give the magnesium oxide compound.

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The pH of a solution after 400.0 ml of 0.200 m hydrochloric acid, HCl, has been titrated with 0 ml, 320.0 ml, and 500.0 ml of 0.250 m sodium hydroxide, NaOH is 1.63.

The equation for the reaction is-

HCl + NaOH → NaCl + H₂O

Since, the number of moles of HCl is less than NaOH. Therefore, HCl is limiting, and the excess of NaOH is reacted with H₂O,

NaOH → Na+ + OH-

Here, mole of HCl = 0.4 × 0.2 = 0.08 mol

For NaOH added: 0.08 mol HCl requires 0.08 mol of NaOH for complete neutralization

0.08 - 0.08 = 0 mol of NaOH is left after the reaction with 320.0 mL

0.08 - 0.125 = -0.045 mol of NaOH left, which is not possible.

Hence, NaOH is completely reacted with 500.0 mL of HCl.

The concentration of HCl is 0.2 m, and the number of moles of HCl is 0.08 mol. Thus, 0.08 ÷ 0.4 = 0.2 M, the concentration of HCl remaining.

Then,0.125 mol of NaOH reacts with 0.08 mol of HCl.

Therefore, the moles of NaOH left with 320.0 mL = 0.125 - 0.08 = 0.045

The moles of NaOH remaining after 500 mL of HCl are reacted with NaOH = 0 mol. Thus, we can add up the moles of NaOH added to the total, which is 0.125 + 0.045 + 0 = 0.17 moles.

The concentration of NaOH is 0.25 M, and the volume of NaOH is 0.17 L, which yields 0.0425 moles of NaOH.

So, OH- concentration = moles of NaOH/total volume= 0.0425 / (0.4 + 0.32 + 0.5) L= 0.0425 / 1.22 L= 0.0348 M
pH = 14 - pOH = 14 - (- log 0.0348)= 14 + 1.46= 1.63

Therefore, the  pH is 1.63.

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Answer:

Me to I need help please

Answer:   A

Explanation:

Answer:

CH

Explanation:

Molecular formula of propene : C₃H₆

Take the HCF of carbon and hydrogen atoms :

Then, we can write the formula as :

Empirical Formula :

The empirical formula of propene is CH

The balanced equation for this reaction is: 1C + 1G + 1M → 1S, total molar mass of 17.40 g/mol.

To write a balanced equation for the formation of 1 mole of s'mores, we'll consider the molar masses of the chocolate bar, graham cracker, and marshmallow. Since 1 mole of s'mores contains all three components, we'll express the reaction using their respective molar mass.
Molar masses:
- Chocolate bar: 3.30 g/mol
- Graham cracker: 7.00 g/mol
- Marshmallow: 7.10 g/mol
Let's represent the chocolate bar as "C," the graham cracker as "G," and the marshmallow as "M." One mole of s'mores (S) is formed by combining these three components:
C (3.30 g/mol) + G (7.00 g/mol) + M (7.10 g/mol) → S (17.40 g/mol)
The balanced equation for this reaction is:
1C + 1G + 1M → 1S
This equation indicates that 1 mole of chocolate bar, 1 mole of graham cracker, and 1 mole of marshmallow react together to form 1 mole of s'mores, with a total molar mass of 17.40 g/mol.

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A very reactive metal as per the diagram is option D

In the context of the periodic table, a metal is a chemical element that is typically a good conductor of heat and electricity.

Metals are found on the left side of the periodic table, as well as in the middle (known as the transition metals), and include elements such as copper, iron, gold, silver, aluminum, and titanium.

When a metal loses one or more electrons, it forms a positively charged ion. This electron loss can occur in a number of ways, but the most common way is through a process called oxidation.

In a metal, the outermost electrons are held relatively loosely and can be easily removed, leaving behind a positively charged ion. The process of electron loss is often facilitated by chemical reactions with other substances, such as oxygen in the air or an acid in a solution.

Option D has one electron on the outermost shell and will likely loose the electron

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Phương trình NaOH sai nha

Answer:

3.45*10^-29

Explanation:

E=hv

h is Planck's constant and v is the frequency (which was given to us)

E=6.626*10^-34 * 5.21*10^4

E=3.452146*10^-29

Answer: a substance whis lose hydrogen

Explanation:

Taking into account the reaction stoichiometry and the definition of STP, 72.8 L of CO₂ gas is produced once the gas cools to STP.

In first place, the balanced reaction is:

CaCO₃  → CaO + CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

The following rule of three can be applied: if by reaction stoichiometry 1 mole of CaCO₃ form 1 mole of CO₂, 3.25 moles of CaCO₃ form how many moles of CO₂?

\(moles of CO_{2} =\frac{3.25 moles of CaCO_{3}x 1 mole of CO_{2}}{1 moleof CaCO_{3}}\)

moles of CO₂= 3.25 moles

Then, 3.25 moles of CO₂ are formed when 3.25 moles of CaCO₃ decomposes.

Now, you can apply the following rule of three: if by definition of STP conditions 1 mole of CO₂ occupies a volume of 22.4 liters, 3.25 moles occupies how much volume?

\(volume= \frac{3.25 molesx22.4 L}{1 mole}\)

volume= 72.8 L

Finally, 72.8 L of CO₂ gas is produced once the gas cools to STP.

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STP:

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Answer:

Hey mate.....

Explanation:

This is ur answer.....

Volcanoes are closely associated with plate tectonic activity. Most volcanoes, such as those of Japan and Iceland, occur on the margins of the enormous solid rocky plates that make up Earth's surface.

Hope it helps!

Brainliest pls....

Follow me! ;)

Answer:

They are closely related the most to Plate Tectonics. They're usually at Convergent plate boundaries.

Explanation:

Hope this helped! Sorry if I'm wrong.

-Bella

To determine the molarity (M) of a solution, we need to know the number of moles of solute in one liter of solution. In this case, we are given that 11 grams of CO2 is dissolved in 1000 mL of solution.

The molar mass of CO2 is 44 g/mol, so we can convert the mass of CO2 to moles by dividing by the molar mass. 11 g CO2 x (1 mol CO2/44 g CO2) = 0.25 mol CO2 Now we can calculate the molarity by dividing the number of moles by the volume in liters: Molarity (M) = 0.25 mol CO2 / 1 L = 0.25 M To calculate the percent by mass (%), we need to know the mass of the solute and the mass of the solution. The mass of the solution is 1000 mL of water, which has a density of 1 g/mL, so the mass of the solution is 1000 g. The mass of the solute is 11 g. Therefore, the percent by mass is: % by mass = (11 g CO2 / 1000 g solution) x 100% = 1.1% Finally, to calculate the concentration in parts per million (ppm), we need to know the mass of the solute and the mass of the solution, but in units of milligrams (mg). We can convert grams to milligrams by multiplying by 1000. Therefore, the mass of CO2 in milligrams is: 11 g CO2 x (1000 mg/g) = 11000 mg CO2 The concentration in parts per million is then: ppm = (11000 mg CO2 / 1000 g solution) x 10^6 = 11000 ppm

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The reaction involved is the reaction of PbO with sodium carbonate (Na2CO3) to produce lead(II) carbonate (PbCO3) and sodium oxide (Na2O).

To prepare a solid sample of lead(II) carbonate, we can start with lead(II) oxide (PbO) as the starting material. The chemical equation for the reaction is:

PbO + Na2CO3 → PbCO3 + Na2O

To carry out the reaction, we first need to weigh out the required amount of PbO and Na2CO3 based on the stoichiometry of the reaction. The PbO and Na2CO3 are then mixed thoroughly and placed in a crucible. The mixture is heated in a furnace at a temperature of around 600-700°C for a few hours until the reaction is complete and the mixture has turned into a solid mass.

Once the reaction is complete, the crucible is removed from the furnace and allowed to cool to room temperature. The solid mass of PbCO3 is then carefully removed from the crucible, crushed to a fine powder, and stored in an airtight container for further use. This method is a simple and efficient way to prepare a solid sample of lead(II) carbonate from lead(II) oxide.

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In a combination reaction, 1.50 g of lithium is mixed with 6.98 g of oxygen. The product is an ionic solid. The reactant will be

First we should write the reaction is:

4Li + O₂ → 2Li₂O

First we should calculate Moles of lithium in 1,50g are:

1,50g × (1mol / 6,941g) = 0,216 moles of Li

Moles  O₂ = 6,98g × (1mol / 32g) = 0,218 moles of O₂

The complete reaction of oxygen will be

0,218 mol ₓ (4mol Li / 1 mol O₂) = 0,872 moles of Li.

The excess reactant is oxygen since there are more moles of oxygen than the amount of lithium that is needed.

Lithium is the limiting reactant, hence the product generated is moles of lithium  ÷2, that is, 0,108 moles

After the reaction there are 0 moles of Li, 0,218 - 0,216× (1 mol O₂/4 mol Li) = 0,164 moles of O₂ and 0,432 moles of Li₂O. In grams:

0g Li

0,164 mol ₓ (32g / mol) = 5,25g of O₂

0,108mol Li₂O ₓ (29,88g / mol) = 3,23g of Li₂O

Your question is incomplete but most probably your full question was

In a combination reaction, 1.50 g of lithium is mixed with 6.98 g of oxygen. The product is an ionic solid. how many grams of each reactant and product are present ?

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