Aqua regia, a mixture of HCl and HNO₃, has been used since alchemical times to dissolve many metals, including gold. Its orange color is due to the presence of nitrosyl chloride. Consider this one-step reaction for the formation of this compound:NO(g) + Cl₂(g) → NOCl (g) + Cl(g) ΔH° = 83KJ(b) Calculate Ea(rev) .

In the laboratory, hydrogen gas is used as fuel for various purposes, including heating. In order to start the heating process, it is necessary to allow the hydrogen gas to flow continuously for a while. This is because there may be air or other gases present in the hydrogen gas pipeline that can affect the heating process.

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Answer: Anaphylaxis

Explanation:

I have a nut allergy, and this has happened to me once. The doctors also told me a lot about anaphylaxis, and I like to learn about myself.

I hope this helps!! :)

Respuesta:

16,7 mL

Explicación:

Paso 1: Información provista

Paso 2: Calcular el volumen de la solución concentrada

Queremos preparar una solución diluida de hipoclorito de sodio a partir de una concentrada. Podemos calcular el volumen inicial que debemos tomar usando la regla de dilución.

C₁ × V₁ = C₂ × V₂

V₁ = C₂ × V₂ / C₁

V₁ = 0,5% × 200 mL / 6% = 16,7 mL

Answer:

the correct answer is D

Explanation:

D

The diagram which shows the correct way to represent the ionic compound, magnesium oxide is option D.

Electron dot structure is a representation of the valence electrons of an element, represented by the dots around the symbol of the element.

An ionic compound is formed by the combination of two or more ions. Note that the two ions that compose an ionic bond are held purely by electrostatic interaction of the oppositely charged ions.

The correct depiction of MgO is the arrangement in which the two ions, \(Mg^{2+}\) and \(O^{2-}\) are placed in different brackets and the oxygen ion has a complete octet as seen in option D.

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The pH remains unchanged as silver nitrate is added because the reaction between silver nitrate and lithium hydroxide does not involve the release or consumption of protons (H+ ions).

When silver nitrate (AgNO3) is added to lithium hydroxide (LiOH), a precipitation reaction occurs, forming silver hydroxide (AgOH) and lithium nitrate (LiNO3). The balanced equation for the reaction is:

2AgNO3 + 2LiOH -> Ag2OH + 2LiNO3

Since the Ksp (solubility product constant) of silver hydroxide is given as 2.0 x 10^-8, it indicates that silver hydroxide is only slightly soluble in water. As a result, most of the silver hydroxide formed will precipitate out of solution.

The pH of a solution is determined by the concentration of H+ ions. In this reaction, there is no consumption or production of H+ ions. Lithium hydroxide is a strong base that completely dissociates in water, but it does not affect the pH significantly as the concentration is low (0.10 M). Silver nitrate is a neutral salt, so it also does not contribute to any pH changes.

Therefore, the addition of silver nitrate does not have any significant impact on the pH of the solution. The pH remains unchanged throughout the reaction.

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Answer: 7.81 mol HgO (How many moles of mercury(II) oxide, HgO, are needed to produce 125 g of oxygen, O2?)

Explanation:

Warmth and mοisture are indeed the primary factοrs that cοntribute tο micrοbial grοwth in mοst buildings.

The humidity in the atmοsphere is called mοisture. The prοpοrtiοn οf mοisture in the atmοsphere depends οn the temperature. Air with higher temperature hοlds a greater amοunt οf mοisture.

Dampness, in particular, creates a favοrable envirοnment fοr fungi tο thrive. Micrοbes, like all living οrganisms, require water tο survive and carry οut their metabοlic prοcesses.

In additiοn tο warmth and mοisture, pH levels and οxygen levels alsο play significant rοles in micrοbial grοwth. Different micrοοrganisms have different pH preferences, and extreme pH cοnditiοns can inhibit their grοwth. Similarly, οxygen availability οr the absence thereοf can determine the types οf micrοbes that can thrive in a given envirοnment.

Understanding these physical and chemical factοrs is crucial fοr managing micrοbial grοwth in buildings, as cοntrοlling mοisture levels and maintaining apprοpriate cοnditiοns can help prevent the prοliferatiοn οf harmful micrοοrganisms and minimize pοtential health risks.

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Minerals Can Be formed by Precipitation, Crystallization

The 206 kJ of energy is absorbed for each mole of CH4(g) that reacts. This means that the reaction is endothermic.

Therefore, the balanced thermochemical equation is as follows.

\(CH4(g) + H2O(g) → H2(g) + CO(g)ΔH\)

= \(+ 206 kJ\) (Energy is absorbed)2)

\(CH4(g) + O2(g) → CO2(g) + H2O(g)\)

And,

802 kJ of energy is evolved for each mole of CH4(g) that reacts. This means that the reaction is exothermic.

Therefore, the balanced thermochemical equation is as follows.

\(CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)ΔH\)

= - 802 kJ (Energy is evolved)3)  Given reaction is;

\(H2(g) + O2(g) → H2O(g)\)

And, 242 kJ of energy is evolved for each mole of H2(g) that reacts. This means that the reaction is exothermic. Therefore, the balanced thermochemical equation is as follows.

\(H2(g) + 1/2 O2(g) → H2O(g)ΔH\)

= \(- 242 kJ\)(Energy is evolved)

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Answer:

There are nine major kinds of natural resources found on the planet Earth, and all these nine major resources come under two categories, that is, renewable and nonrenewable. The renewable resources refer to the resources that get regenerated again and again over a short time duration. These include five major resources, that is, wind, solar, hydro, geothermal, and biomass.  

On the other hand, nonrenewable energy resources are the ones that are present in a very limited amount, as it takes a very long time to regenerate again. The general kinds of nonrenewable energy resources are nuclear, coal, oil, and natural gas.  

Hence, biomass, solar, and geothermal energy comes under the renewable resources category, and coal, natural gas, and oil come under renewable resources category.  

Answer: the verified answer from an expert.

Explanation:

Explanation:

surface tension and heat of vaporization

Answer:

I did this already

................

Answer:

DNA

Explanation:

because genetics come from DNA

Answer:

Like about 5-6 days in the fridge.

Explanation:

Answer:

calcule o PH e POH de 2,625g de HCLO em 2000cm3 (cl=35,5)

Explanation:

The word chemical equation which  hydrogen reacting with oxygen to form water is hydrogen + oxygen → water.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer: Its not popping up for me *-*?

Answer: C, 0

Explanation: just a mere guess

The term "pyo-" (py/o/rrhea; pyo/genic) means "pus" or "related to pus."

The prefix "pyo-" is derived from the Greek word "pyon," which means pus. When used as a prefix in medical terminology, "pyo-" indicates a condition or process related to pus or the presence of pus.

For example, "pyorrhea" refers to a condition characterized by the discharge of pus from a wound or an infection of the gums. In this case, the term combines "pyo-" (meaning pus) and "-rrhea" (meaning discharge or flow).

Similarly, "pyogenic" refers to something that causes or is related to the production of pus. It is often used to describe bacteria or microorganisms that can lead to the formation of pus in infected tissues.

In summary, the prefix "pyo-" in medical terminology denotes pus or the involvement of pus in a specific condition, indicating a discharge, infection, or pus-forming process.

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Because 5.00 mL is a small amount, the best tool he could use is a pipette.

Pipette or sometimes spelled as pipet can be used to transport liquid samples. It is made out of glass or plastic and can is usually used to transfer measured volumes of liquid from one container to another.

Before the pipette was invented, scientists used to use straws and they would suck in the samples carefully.

Hence 5.00 mL is a small amount, the best tool he could use is a pipette.

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Answer:

1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm

Explanation:

An ideal gas is a set of atoms or molecules that move freely without interactions. The pressure exerted by the gas is due to the collisions of the molecules with the walls of the container. The ideal gas behavior is at low pressures, that is, at the limit of zero density. At high pressures the molecules interact and intermolecular forces cause the gas to deviate from ideality.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Reemplacing:

1 atm* 22.4 L= n* 0.082 \(\frac{atm*L}{mol*K}\) *273 K

Solving:

\(n=\frac{1 atm* 22.4 L}{0.082 \frac{atm*L}{mol*K} *273 K}\)

n= 1 mol

Another way to get the same result is by taking the STP conditions into account.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) 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.

1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm

Answer:

A not

B yes

C yes

D yes

Explanation:

A 2C 6H but 10O and 7O so no

B 3C 6O 2Fe on each side  so yes

C 4H 1S 6O 2Na so yes

D 2Ag 2Cl 1Ca 2N 6O so yes

Answer:i

i believe its contraction but i might be wrong

Explanation:

Answer:

It might be expansion, sorry if it's wrong.

Charles's Law helps us understand the relationship between temperature and volume of a gas when other factors, such as pressure and number of moles, remain constant. The empirical gas law that describes the relationship between the volume and temperature of a gas when the number of moles and pressure are constant is Charles's Law.  

This can be expressed mathematically as: V₁/T₁ = V₂/T₂
Where V₁ and V₂ represent the initial and final volumes of the gas, and T₁ and T₂ represent the initial and final temperatures of the gas, respectively. The relationship can also be stated as: V/T = constant

To illustrate this law, let's consider an example. Imagine a balloon filled with a fixed number of moles of gas at a constant pressure. If we were to heat the balloon by placing it in a warm environment, the temperature of the gas inside the balloon would increase.  

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The statement that a solution can only be made from the same amounts of solute and solvent is not entirely accurate. While it is true that certain solutions may require a specific ratio of solute to solvent for optimal results, the concentration of a solution can vary depending on the desired outcome.

For example, a dilute solution may contain a small amount of solute relative to the amount of solvent, whereas a concentrated solution may contain a larger amount of solute in the same amount of solvent.

Additionally, the solubility of a solute can also affect the amount of solute needed to form a solution. Some solutes may have a higher solubility in a given solvent than others, meaning that less of that solute is needed to create a saturated solution.

Overall, while a certain amount of solute and solvent may be needed to form a solution, the concentration and solubility of the solute can vary and ultimately affect the amount needed to create a specific solution.

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Answer:

Explanation:

The first step is to determine the amount of H2SO4 that was spilled:

moles of H2SO4 = concentration x volume

= 18.0 mol/L x 0.0100 L

= 0.180 mol

Next, we need to determine which reactant is limiting. To do this, we can compare the amount of moles of H2SO4 with the amount of moles of NaHCO3 that would be needed to completely neutralize it. From the balanced equation, we know that 1 mole of H2SO4 reacts with 2 moles of NaHCO3:

moles of NaHCO3 needed = 2 x moles of H2SO4

= 2 x 0.180 mol

= 0.360 mol

The mass of sodium bicarbonate used is the difference between the initial mass and the final mass:

mass of NaHCO3 used = 155.0 g - 144.5 g

= 10.5 g

We can convert the mass of NaHCO3 used to moles:

moles of NaHCO3 used = mass / molar mass

= 10.5 g / 84.01 g/mol

= 0.125 mol

Since we have more moles of H2SO4 than moles of NaHCO3 needed, the limiting reactant is NaHCO3. This means that H2SO4 is in excess.

To determine the maximum yield of Na2SO4, we need to calculate the theoretical yield based on the limiting reactant:

moles of Na2SO4 = 1/2 x moles of NaHCO3 used

= 1/2 x 0.125 mol

= 0.0625 mol

mass of Na2SO4 = moles x molar mass

= 0.0625 mol x 142.04 g/mol

= 8.88 g

Therefore, the maximum yield of Na2SO4 that can be obtained is 8.88 g. Since the actual amount of NaHCO3 used is less than what is needed to completely react with the H2SO4, we can conclude that not enough sodium bicarbonate was used.

Answer:

Physical change

Explanation:

The only change is in the shape, or length in this case, of the object. So its chemical makeup is still the same, it's still grass.

Mowing the lawn is considered a physical change. A physical change is a change in the physical properties of a substance or material without altering its chemical composition.

A physical change is a transformation that alters the physical properties of a substance, such as size, shape, or phase, without changing its chemical composition. In the case of mowing the lawn, the grass is physically cut into smaller pieces, but the individual grass blades themselves remain chemically unchanged.

When you run a lawnmower over a lawn, the sharp blades of the mower cut through the grass, trimming it to a desired height. This action changes the appearance and size of the grass, but it does not alter the identity or chemical composition of the grass. The grass blades are still composed of the same materials, such as cellulose and other organic compounds.

When you mow the lawn, you are cutting the grass blades into smaller pieces, but the grass itself remains the same chemically. The process of mowing only affects the physical appearance and size of the grass, not its fundamental composition.

Therefore, mowing the lawn is considered a physical change.

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Answer:

C

Explanation:

APEX

the conclusions of an scientific experiment tell why the data support or reject the hypothesis. Thus option C is correct.

Scientific experiment involve asking different scientific questions, making hypothesis, design experiment, result and conclusion.

A good scientific experiment should have some facts which can be answered by using data analysis.

The types of scientific questions are Verification questions, Theory questions, Experimental questions

The verification question can be solved by collecting data from observation, which include characteristics or properties of a subject.

A theory question refers an imaginative exercise, is not fictional, depend on prior knowledge of the phenomenon being asking about.

The scientific question or an experimental question used to compare the element of a system when altered, it involves variables such as independent, dependent and controlled variables.

Thus option C is correct.

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In this question, we have the following reaction, which is the cellular respiration reaction:

C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

We have:

120 grams of CO2 being produced

The molar ratio between CO2 and O2 is 6:6, which means the same amount of moles produced of CO2 will be the same amount used of O2

Now we find the number of moles of CO2, using its molar mass = 44.01g/mol

44.01 grams = 1 mol

120 grams = x moles

44.01x = 120

x = 120/44.01

x = 2.73 moles of CO2

If we have 2.73 moles of CO2, we will also have 2.73 moles of O2, and to find its mass, we will also use the molar mass of O2 = 32g/mol

32 grams = 1 mol

x grams = 2.73 moles

x = 2.73 * 32

x = 87.4 grams of O2

The amount required of oxygen gas to produce 120 grams of CO2 based on the cellular respiration reaction will be 87.4 grams