What is the role of manganese dioxide in the preparation of oxygen gas in the laboratory?​

Answer:

1.This answer would be option A.

2. I think that would be 1350

Explanation:

Answer:

20 g g/mL. 15.77

Explanation:

i think i answer it

Empirical formula is C₂H₄O.

A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule CH2O is the empirical formula for glucose.

1) The first step in this problem is to change the % to grams.

2) Next divide all the given masses by their molar mass.

3) Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.

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The pressure exerted by the neon gas, when the volume is increased from 7.2 mL to 28.8 mL at constant temperature, can be calculated using Boyle's Law. The pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

Boyle's Law states that at constant temperature, the product of the pressure and volume of a gas remains constant. Mathematically, it can be expressed as P₁V₁ = P₂V₂. This law allows us to calculate the change in pressure when the volume changes.

In this case, the initial volume (V₁) is given as 7.2 mL, and the initial pressure (P₁) is 1.5 atm. The final volume (V₂) is 28.8 mL. By substituting these values into Boyle's Law equation, we can solve for the final pressure (P₂).

When we perform the calculations, we find that the pressure exerted by the neon gas, when the volume is increased to 28.8 mL, is 0.375 atm. As the volume increases, the pressure decreases due to the inverse relationship between pressure and volume.

Using Boyle's Law: P₁V₁ = P₂V₂

Given:

Initial volume (V₁) = 7.2 mL

Initial pressure (P₁) = 1.5 atm

Final volume (V₂) = 28.8 mL

To find the final pressure (P₂):

P₂ = (P₁ * V₁) / V₂

  = (1.5 atm * 7.2 mL) / 28.8 mL

  = 0.375 atm

Therefore, the pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

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The leopard seal is an organism gains energy directly from eating the krill.

Krill are small crustacean organisms belonging to the order Euphausiacea and are found in all oceans. The name "krill" comes from the Norwegian language meaning "small fry of fish", which is also a species of fish.

Organisms living in water bodies for example blue whales and other large whales, leopard seals, and other seals, different species of penguins, albatrosses and other seabirds, several fish species, and squids and other invertebrates all of them eat huge numbers of Antarctic krill.

So we can conclude that the organism gains energy directly from eating the krill the Leopard seal.

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Answer:

0.00044 g/mL

Explanation:

First, 0.220 g of KIO₃ are dissolved in 50 mL, so the concentration at this point is:

Then 2.00 mL of this solution are added to 8.00 mL of water (final volume = 10.00 mL). We calculate the concentration of the resulting solution:

Finally, to this 10 mL solution, another 10.00 mL were added. Thus the KIO₃ (or IO₃⁻) concentration is:

Answer:

B

Explanation:

I'm very sure it decreases

While a sample of liquid is freezing, its thermal energy decreases. Therefore, the correct option is option B.

Thermal energy is the internal energy that an object or system has as a result of the movement of its constituent particles. It is a type of kinetic energy that is related to a substance's temperature. A substance's overall thermal energy is impacted by the constantly moving particles that make up the substance. Conduction, convection, and radiation are the three basic ways that thermal energy can move from one thing to another. Heat transfers from the warmer to the cooler object by conduction when two things are in close proximity.

Therefore, the correct option is option B.

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Answer: Density is 0.39g/ml and will float

Explanation:

Density is mass/volume : 1.95g/5.0ml = 0.39g/ml

This sample will float on water because a object with a density less than 1g/cm3 will float. 1 cubic centimeter equal 1 ml.

The reaction between HCl and Ca(OH)2 is a double displacement neutralization reaction that produces CaCl2 and H2O as products, while the Ca2+ and Cl- ions remain in solution as spectator ions.

The given chemical equation represents a double displacement reaction between hydrochloric acid (HCl) and calcium hydroxide (Ca(OH)2), which produces water (H2O) and calcium chloride (CaCl2) as the products.

The reaction can be understood in terms of the following ionic equation:

H+(aq) + Cl-(aq) + Ca2+(aq) + 2OH-(aq) → 2H2O(l) + Ca2+(aq) + 2Cl-(aq)

In this equation, the H+ and Cl- ions from HCl combine with the Ca2+ and OH- ions from Ca(OH)2 to form H2O and CaCl2. The Ca2+ and Cl- ions remain in solution, indicating that they are spectator ions that do not participate in the reaction.

This reaction is also a neutralization reaction, as an acid (HCl) reacts with a base (Ca(OH)2) to form a salt (CaCl2) and water. The balanced equation shows that two moles of HCl react with one mole of Ca(OH)2 to form two moles of CaCl2 and two moles of H2O.

It is important to note that this reaction is exothermic, meaning it releases heat. This is because the formation of H2O molecules is accompanied by a release of energy.

Overall, the reaction between HCl and Ca(OH)2 is a double displacement neutralization reaction that produces CaCl2 and H2O as products, while the Ca2+ and Cl- ions remain in solution as spectator ions.

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Answer:

2.04 g/cm3

Explanation:

Density = mass ÷ volume

= 5100 ÷ 2500

=2.04 g/cm3

Answer:

C ) 2, 1, 2

Explanation:

The given reaction is synthesis reaction in which lithium and bromine react to form lithium bromide.

Chemical equation:

Li + Br₂    →    LiBr

Balanced chemical equation:

2Li + Br₂    →    2LiBr

Step 1:

Li + Br₂    →    LiBr

left hand side                         Right hand side

Li = 1                                        Li = 1

Br = 2                                        Br = 1

Step 2:

Li + Br₂    →    2LiBr

left hand side                         Right hand side

Li = 1                                        Li = 2

Br = 2                                        Br = 2

Step 3:

2Li + Br₂    →    2LiBr

left hand side                         Right hand side

Li = 2                                       Li = 2

Br = 2                                        Br = 2

The combination of properties would be expected to lead to the most viscous liquid include:

This is defined as the resistance of a liquid to flow and is characterized by its sticky nature.

This is as a result of the strong intermolecular forces which holds the atoms together and low temperature keeps them in shape thereby making it the most appropriate c hoice.

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V = Mass /Density

Density is supposed to be given, but its not
solids typically have a density of 5.03 g/cm^3

V = 10.3/5.03
V = 2.05 cm^3

The Kligler's Iron Agar (KIA) slant can be used to determine various characteristics of bacteria, but there is one specific aspect that it cannot determine.

The Kligler's Iron Agar (KIA) slant is a differential medium used to identify and differentiate bacteria based on their ability to ferment sugars and produce hydrogen sulfide gas. It is primarily used to determine the following characteristics:

1. Fermentation of sugars: KIA can detect the fermentation of glucose and lactose by bacteria. It helps in differentiating between organisms that can ferment both sugars (e.g., Escherichia coli) and those that can only ferment glucose (e.g., Salmonella).

2. Production of gas: KIA can also indicate the production of gas during sugar fermentation. The presence of gas is observed as cracks or fissures in the agar medium.

3. Production of hydrogen sulfide: KIA can detect the production of hydrogen sulfide gas by bacteria. This is observed as a black precipitate (ferrous sulfide) in the medium.

However, there is one aspect that KIA cannot determine, and it is not specified in the question. It is important to provide the specific aspect or characteristic being referred to in order to provide a complete answer.

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Answer: im thinking its gonna be d.C2H6 and also

the explanation is on the research i had did before i had answered this question so i really hope this help :)

Explanation:

Ar = van de waals forces or london forces

C

H

4

= van de waals forces or london forces

HCl=permanent dipole-dipole interactions

CO = permanent dipole-dipole interactions

HF = hydrogen bonding

N

a

N

O

3

= permanent dipole-dipole interactions

C

a

C

l

2

= van de waals forces or london forces

Chemical compounds are substances formed by the combination of two or more elements in fixed proportions. They are held together by chemical bonds, which can be either ionic or covalent.

Chemical compounds have unique properties that are different from the properties of their constituent elements. Chemical compounds have distinct chemical and physical properties, including melting and boiling points, solubility, reactivity, and specific chemical behaviors.

a. BaSO₄ (barium sulfate): The most important interparticle forces in BaSO₄ are ionic forces. BaSO₄ consists of Ba²⁺ cations and SO₄²⁻ anions, which are held together by strong electrostatic attractions between opposite charges.

b. H₂S (hydrogen sulfide): In H₂S, the most important interparticle forces are dipole-dipole forces. H₂S is a polar molecule, with a partial positive charge on the hydrogen atom and a partial negative charge on the sulfur atom. The positive and negative ends of neighboring H₂S molecules attract each other, resulting in dipole-dipole interactions.

c. Xe (xenon): In Xe, the most important interparticle forces are London dispersion forces. Xe is a noble gas and consists of individual Xe atoms. Although Xe atoms are nonpolar, they still experience temporary fluctuations in electron distribution, leading to temporary induced dipoles. These induced dipoles can induce dipoles in neighboring Xe atoms, resulting in London dispersion forces.

d. C₂H₆ (ethane): The most important interparticle forces in C₂H₆ are van der Waals forces, specifically London dispersion forces. Ethane consists of nonpolar C-C and C-H bonds, resulting in temporary fluctuations in electron distribution and temporarily induced dipoles. These induced dipoles induce dipoles in neighboring ethane molecules, leading to London dispersion forces.

e. CsI (cesium iodide): The most important interparticle forces in CsI are ionic forces. CsI consists of Cs+ cations and I- anions, which are held together by strong electrostatic attractions between opposite charges.

f. P₄ (phosphorus): In P₄, the most important interparticle forces are covalent bonds. P₄ exists as a molecule made up of four phosphorus atoms, connected by covalent bonds within the molecule.

g. NH₃ (ammonia): In NH₃, the most important interparticle forces are hydrogen bonding. NH₃ is a polar molecule with a partially positive hydrogen atom and a partially negative nitrogen atom. Hydrogen bonding occurs when the hydrogen atom of one NH₃ molecule forms a strong electrostatic interaction with the lone pair of electrons on the nitrogen atom of a neighboring NH₃ molecule.

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molar mass of PF5 = 125.966 g/mol

125 g PF5 × (1 mol PF5/125.966 g PF5) = 0.992 mol PF5

0.992 mol PF5 × (6.022 × 10^23 molecules PF5);

= 5.97 × 10^23 molecules PF5

Since there 5 fluorine atoms per molecule of PF5,

(5.97.× 10^23 molecules PF5) × (5 atoms F/1 molecule PF5)

= 2.99 × 10^24 atoms F

The balanced chemical reaction using an atom inventory is 2NaBr + CI₂ -> 2NaCI + [1]Br₂.

A balanced chemical reaction is one in which the number of atoms on the reactant side and on the products side is equal. It is necessary to equal the number of atoms on both sides.

The reaction given is of sodium bromide reacting with chlorine, which is, giving sodium chloride and bromine. This is a single displacement reaction.

2NaBr + CI₂ -> 2NaCI + [1]Br₂.

The combination of the two elements sodium (Na) and bromine (Br2) (B r 2) results in the creation of sodium bromide (NaBr). Decomposition, replacement, or combustion are not what it is. The creation of sodium bromide from sodium and bromine is a synthesis reaction.

Therefore, the balanced chemical reaction is 2NaBr + CI₂ -> 2NaCI + [1]Br₂.

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The pH of a solution can be determined by calculating the concentration of hydrogen ions (H+) in the solution.

1. Calculate the number of moles of calcium fluoride (CaF2) using its molar mass. The molar mass of CaF2 is 78.08 g/mol, so:
Number of moles = Mass of CaF2 / Molar mass of CaF2
                 = 4.91 g / 78.08 g/mol
2. Convert the volume of the solution from milliliters to liters:
Volume of solution = 740 ml / 1000 ml/L
3. Use the moles of CaF2 to determine the concentration of fluoride ions (F-) in the solution. Since calcium fluoride (CaF2) dissociates into one calcium ion (Ca2+) and two fluoride ions (F-), the concentration of fluoride ions is: Concentration of F- = (2 * Moles of CaF2) / Volume of solution
4. Calculate the concentration of hydrogen ions (H+) using the equilibrium constant (Ka) for hydrofluoric acid (HF) and the concentration of fluoride ions (F-). The equation for this reaction is:

HF + H2O ⇌ H3O+ + F-
  Using the Ka value of 6.8x10-4, we can set up an ICE table and solve for the concentration of H+.

 

Let x be the concentration of H+.
  Initial: 0        0
  Change: -x        -x
  Equilibrium: x     x
  Ka = [H3O+][F-] / [HF]
  6.8x10-4 = x^2 / [F-]
  Since the concentration of HF is negligible compared to the concentration of fluoride ions, we can assume that the concentration of fluoride ions is equal to the concentration of hydrogen ions.
  6.8x10-4 = x^2
  x = sqrt(6.8x10-4)
5. Calculate the pH of the solution using the concentration of hydrogen ions (H+):
  pH = -log[H+]

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Answer: As ice melts into water, kinetic energy is being added to the particles. This causes them to be 'excited' and they break the bonds that hold them together as a solid, resulting in a change of state: solid -> liquid.

Explanation:

The electronegativity periodic table is a chart that arranges elements according to their electronegativity, which is a measure of an atom's ability to attract electrons to itself. Electronegativity is a chemical property that reflects the relative tendency of an atom to draw electrons towards itself when it forms a chemical bond with another atom.

The electronegativity values are usually determined using the Pauling scale, which was developed by Linus Pauling and is widely used in chemistry. In this scale, the electronegativity of an element ranges from 0.7 for cesium to 4.0 for fluorine, with increasing electronegativity moving from left to right across a period and increasing as one moves down a group.

The electronegativity values can be useful in understanding chemical bonding and the behavior of molecules. For example, elements with high electronegativity values tend to form ionic bonds, while elements with low electronegativity values tend to form covalent bonds. Additionally, the electronegativity difference between two bonded atoms determines the type of bond, with larger differences indicating polar covalent bonds and smaller differences indicating nonpolar covalent bonds.

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Explanation:

by using mole concept you can solve this problem but please check once the answer

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

Answer:

Explanation: The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance

The rate constant of a first-order reaction that takes 555 seconds for the reactant concentration to drop to half of its initial value is 1.2 x 10^-3 sec^-1.

A first-order reaction refers to a chemical reaction in which the rate of reaction is proportional to the concentration of the reactant. In other words, doubling the reactant concentration doubles the reaction rate. The time taken that is taken for original population of radioactive atoms to decay to half of initial value is called the half-life. The half-life of a first-order reaction is a constant that is related to the rate constant (k) for the reaction given by: t1/2 = 0.693/k. Radioactive decay reactions are first-order reactions.

According to the provided information, t1/2 = 555 seconds

Hence,

555 = 0.693/k

k = 0.693/555 = 0.0012486 = 1.2 x 10^-3 sec^-1

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The ATP (Available-to-Promise) for weeks 1 to 8 is the amount of inventory that a firm can commit to fulfilling customer orders within that time frame.

To calculate the ATP, you need to consider the MPS (Master Production Schedule) and the ATP calculations.

1. Start by looking at the MPS for weeks 1 to 8. The MPS represents the planned production quantities for each week.
2. Determine the beginning inventory for week 1. This is the inventory available at the start of week 1.
3. Add the MPS quantity for week 1 to the beginning inventory. This gives you the available inventory for week 1.
4. Subtract customer orders for week 1 from the available inventory. This gives you the remaining inventory after fulfilling customer orders for week 1.
5. Repeat steps 3 and 4 for each subsequent week, using the previous week's remaining inventory as the beginning inventory for the next week.
6. Continue this process until you reach week 8, calculating the available inventory and subtracting customer orders for each week.
7. The resulting values represent the ATP for weeks 1 to 8.

The ATP can fluctuate as new customer orders are received or changes are made to the MPS. Regular monitoring and adjustment of the ATP is necessary to ensure accurate order fulfillment.

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The species that act as acid are the ones that donates H⁺ in the reaction.

Since we are working with an equilibrium, we have to consider both directions.

From left to right, we have H₂O turning into OH⁻ because it lost one H⁺, so H₂O is acting as an acid in the forward reaction.

From right to left, we have CH₃NH₃⁺ tunrning into CH₃NH₂ because it lost one H⁺, so CH₃NH₃⁺ is acting as an acid in the backwards reaction.

So, the species that act as acids are H₂O and CH₃NH₃⁺, I and II only.

Answer:

c,e,f

Explanation:

Judging by what i tried to find out about this reaction, it seems that won't take place, though it could be wrong.

Answer:

0.35 g.

Explanation:

We'll begin by calculating the number of mole of Fe(NO3)3 in 35 mL of 0.250 M Fe(NO3)3 solution.

This is illustrated below:

Molarity of Fe(NO3)3 = 0.250 M

Volume = 35 mL = 35/1000 = 0.035 L

Mole of Fe(NO3)3 =?

Molarity = mole /Volume

0.250 = mole of Fe(NO3)3 / 0.035

Cross multiply

Mole of Fe(NO3)3 = 0.25 x 0.035

Mole of Fe(NO3)3 = 8.75×10¯³ mole

Next, we shall determine the number of mole of KOH in 55 mL of 0.180 M

KOH solution. This is illustrated below:

Molarity of KOH = 0.180 M

Volume = 55 mL = 55/1000 = 0.055 L

Mole of KOH =.?

Molarity = mole /Volume

0.180 = mole of KOH /0.055

Cross multiply

Mole of KOH = 0.180 x 0.055

Mole of KOH = 9.9×10¯³ mole.

Next, we shall write the balanced equation for the reaction. This is given below:

3KOH + Fe(NO3)3 —> Fe(OH)3 + 3KNO3

From the balanced equation above,

3 moles of KOH reacted with 1 mole of Fe(NO3)3 to produce 1 mole of Fe(OH)3.

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

From the balanced equation above,

3 moles of KOH reacted with 1 mole of Fe(NO3)3.

Therefore, 9.9×10¯³ mole of KOH will react with = (9.9×10¯³ x 1)/3 = 3.3×10¯³ mole of Fe(NO3)3.

From the above illustration, we can see that only 3.3×10¯³ mole out of 8.75×10¯³ mole of Fe(NO3)3 given is needed to react completely with 9.9×10¯³ mole of KOH.

Therefore, KOH is the limiting reactant and Fe(NO3)3 is the excess reactant.

Next, we shall determine the number of mole of Fe(OH)3 produced from the reaction.

In this case, we shall use the limiting reactant because it will give the maximum yield of Fe(OH)3 as all of it is consumed in the reaction.

The limiting reactant is KOH and the mole of Fe(OH)3 produce can be obtained as follow:

From the balanced equation above,

3 moles of KOH reacted to produce 1 mole of Fe(OH)3.

Therefore, 9.9×10¯³ mole of KOH will react to produce = (9.9×10¯³ x 1)/3 = 3.3×10¯³ mole of Fe(OH)3.

Finally, we shall convert 3.3×10¯³ mole of Fe(OH)3 to grams. This can be obtained as follow:

Molar mass of Fe(OH)3 = 56 + 3(16 + 1) = 56 + 3(17) = 107 g/mol

Mole of Fe(OH)3 = 3.3×10¯³ mole

Mass of Fe(OH)3 =?

Mole = mass /Molar mass

3.3×10¯³ = Mass of Fe(OH)3 / 107

Cross multiply

Mass of Fe(OH)3 = 3.3×10¯³ x 107

Mass of Fe(OH)3 = 0.3531 ≈ 0.35 g.

Therefore, 0.35 g of Fe(OH)3 was produced from the reaction.

Water is the basis for life as we know it. The unique properties involving its high heat capacity, high heat of vaporization, its ability to remain liquid over a wide temperature range, its unusual density properties in its solid form, and its dipolar nature make water irreplaceable. The uniqueness of water with regards to its properties and dipolar nature is given above.

To say that a molecule is dipolar means that it has two poles or two different charges. Water molecules are dipolar because the hydrogen atoms carry a partial positive charge while the oxygen atom carries a partial negative charge. The dipolar nature of water is a crucial property that makes it a versatile solvent and facilitates many important biological processes. It allows water to dissolve substances with different charges and helps maintain the structure of proteins and DNA by forming hydrogen bonds with these molecules. In short, the dipolar nature of water is one of the reasons why it is such a vital molecule for life. The uniqueness of water with regards to its properties and dipolar nature is given above.

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