A gas has a pressure
of 0.12 atm at 21.0°C.
What is the pressure at
standard temperature?

Answer:

6680 J

Explanation:

Answer:

b) electrons are shared in a covalent bond

Explanation:

remember for ionic bonding, it occurs between a metal and a non-metal, we know that the metal donates electrons to the non-metal while the non-metal is the receiver.

the reason why the metal donates electron is usually because it has between 1-3 electrons on its valence shell and therefore there is a weaker attraction of the positive nucleus to the outermost electrons hence why it is readily donated.

the opposite occurs for the non-metals hence why it readily accepts electrons to become stable

The empirical formula of this compound can be determined using the percent composition data. Since the atomic masses are 12 g/mol for C, 16 g/mol for O, and 190 g/mol for Os, the molar ratio of C, O, and Os are 1.32:1.75:12.50, respectively. Thus, the empirical formula of the compound is CO2Os.

Since the molar mass of the compound is 907 g/mol, the molecular formula can be determined by dividing the molar mass by the empirical formula mass.

The empirical formula mass of CO2Os is 304 g/mol. Dividing 907 g/mol by 304 g/mol yields 3, which means that the molecular formula of the compound is CO2Os3. Thus, the compound is composed of three empirical formula units, forming an Osmium-Carbon Monoxide complex with three Os atoms and two CO molecules.

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The mass of PbCl2 obtained is 18.78 g from 200.0 ml of the original solution.

When a solution of NaCl(aq) is slowly added to a solution of lead nitrate, Pb(NO3)2(aq), a precipitation reaction occurs, resulting in the formation of PbCl2(s). The process is continued until no further precipitation occurs. The precipitate is then collected by filtration, dried, and weighed. In this case, a total of 18.78 g of PbCl2(s) is obtained from 200.0 ml of the original solution.

This reaction can be explained by the principle of double displacement reactions, also known as metathesis reactions. In a double displacement reaction, the positive and negative ions of two different compounds switch places, forming two new compounds. In this case, NaCl and Pb(NO3)2 react to form PbCl2 and NaNO3.

The balanced equation for this reaction is:

2 NaCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 NaNO3(aq)

The amount of PbCl2 obtained can be determined by the stoichiometry of the reaction and the volume of the original solution. From the given information, it is not possible to calculate the concentration of NaCl or Pb(NO3)2 in the original solution. However, knowing the volume of the original solution allows us to determine the mass of PbCl2 obtained.

To calculate the mass of PbCl2, we use the equation:

mass = (volume of original solution) × (concentration of PbCl2)

In this case, the mass of PbCl2 obtained is 18.78 g from 200.0 ml of the original solution.

It is important to note that the concentration of PbCl2 in the original solution cannot be directly determined from the given information. Additional information, such as the concentration of NaCl or Pb(NO3)2, would be required to calculate the concentration of PbCl2 in the original solution.

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When diluting a strong acid with water, it is recommended to add the acid to the water and not the other way around. The statement is true.

This is because adding water to the acid can cause a rapid and exothermic reaction, leading to splattering and potential injury.

When the acid is added to the water, the heat generated is absorbed by the water, reducing the potential for splattering. Additionally, adding the acid to water allows for better mixing and reduces the risk of creating concentrated acid pockets that can be dangerous.

Overall, it is important to follow safe laboratory practices when working with acids and to consult with a trained professional if you are unsure about the proper procedures.

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In a stereospecific reaction, the reactant must possess specific characteristics that determine the stereochemistry of the resulting product.

These characteristics include the presence of stereocenters or chiral centers in the reactant molecule. A stereocenter is an atom, typically carbon, that is bonded to four different substituents, resulting in non-superimposable mirror image structures. The presence of a stereocenter allows for different possible spatial arrangements of atoms, giving rise to stereoisomers.

To ensure stereospecificity, the reactant must have a defined stereochemistry at the stereocenter, meaning that it is in a specific geometric configuration (R or S). The reactant's stereochemistry determines the spatial arrangement of atoms in the product molecule. In a stereospecific reaction, the reactant's stereochemistry remains unchanged during the reaction, and the product is formed with the same stereochemistry as the reactant.

It is important to note that not all reactions are stereospecific, and some reactions may result in a mixture of stereoisomers or racemic mixtures where the stereochemistry is not preserved. Stereospecific reactions play a crucial role in the synthesis of pharmaceuticals, natural products, and other compounds where precise stereochemistry is essential for their biological activity or physical properties.

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the de Broglie wavelength of the electron moving at a velocity of 3. 0 × 107 m/s is 2.4×10∧-11nm

lambda = h/mv

The de Broglie wavelength is defined as follows: lambda = h/mv, wherein the greek letter lambda represents the wavelength, h is Planck's consistent, m is the particle's mass and v is its pace. One may also explicit mv as the particle's momentum

according to wave-particle duality, the De Broglie wavelength is a wavelength manifested in all the gadgets in quantum mechanics which determines the chance density of locating the item at a given factor of the configuration area. The de Broglie wavelength of a particle is inversely proportional to its momentum

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According to Le Chatelier' principle, if a ytem in dynamic equilibrium contain a large excess of reactant, to encourage the formation of more product we can remove product from the system as it is formed.

A system in dynamic equilibrium will respond to a stress (change in conditions) in a way intended to reduce that stress. This is the guiding idea of Le Chatelier.

We want to influence the system's response so that it produces more product.  A reduction in product results from adding stress to the system by removing some of the product. The system's response is to move the equilibrium to the right to boost product production in order to reduce the stress.

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Answer:299,800,000

Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.

Answer:

D. They have the same number of protons as electrons.

Explanation:

Protons are found in the nucleus of the atom and have a positive charge while electrons orbit around the nucleus and have a negative charge. Usually, in a neutral atom of an element, the number of protons is equal to the number of electrons. This is why the atom has no charge because the positive and negative charges cancel out. When an atom loses an electron its charge turns positive while when it gains an electron its charge turns negative.

Many essential elements are needed for the growth and developments of plants. The mineral nutrients are essential for all organisms. Calcium, potassium, etc. are mineral nutrients whereas hydrogen, oxygen, etc. are non mineral nutrients.

The mineral nutrients are defined as the inorganic substances that must be ingested and absorbed in required amounts to perform several metabolic or structural functions in the body.

The non-mineral nutrients are defined as the elements which are synthesized by the body. They are required only in trace amounts. The important non-mineral nutrients include oxygen, hydrogen and carbon.

The mineral nutrients are the macronutrients which include calcium, potassium, phosphorous, etc. The plants get all the required mineral nutrients from the soil. The mineral nutrients being elements, cannot be synthesized biochemically by the living organisms.

All living organisms get minerals from plants or animals.

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Plasma exists at  extremely high temperatures or low pressures, atoms lose their electrons and ionize, creating a gas-like combination of positively charged ions and negatively charged electrons.

Over 15 million degrees Celsius are present at the Sun's core, which is hot enough to remove the electrons from hydrogen atoms and produce a plasma of protons and electrons.

The plasma cannot grow outward due to the intense pressure at the core of the Sun, which keeps it trapped within its gravitational field. The sun's core material can exist as plasma due to the extreme pressure and temperature there.

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Answer:

Electrons are transferred in an iconic bond.

The  splitting pattern for each of the labeled hydrogens in this structure is Signal A: Triplet, Signal B: Quartet, Signal C: Quartet, Signal D: None

Signal A is split by two other protons, resulting in a triplet. Signal B is split by three other protons, resulting in a quartet. Signal C is split by three other protons, resulting in a quartet. Since there are no other protons attached to signal D, it will not have a splitting pattern, and thus is labeled as "None".

In NMR, a multiplet refers to any splitting pattern that results in more than 7 peaks. Since signals A, B, and C each have 4 peaks, they are labeled as triplet and quartet, respectively.

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Answer:

4.2 moles of Ar

Explanation:

Given data:

Number of moles of Ar = ?

Number of atoms of Ar = 2.53 × 10²⁴

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.53 × 10²⁴  atoms ×  1 mole  / 6.022 × 10²³ atoms

0.42 × 10¹ mole

4.2 moles

Answer:

True. The limiting reagent is the reactant that is completely consumed in a chemical reaction and limits the amount of product that can be formed. The theoretical yield is the maximum amount of product that can be obtained from the limiting reagent, assuming that the reaction goes to completion and no side reactions occur. However, in practice, it is common for side reactions to occur, which can reduce the actual yield of the product. Therefore, while the limiting reagent does control the theoretical yield of a reaction, the actual yield may vary due to the presence of side reactions or other factors that can affect the efficiency of the reaction.

Explanation:

The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Explanation:

The mean volume of hydrochloric acid added can be calculated by summing the volume of acid added in each titration and dividing by the number of titrations.

1st titration: 24.80cm³ - 0.00cm³ = 24.80cm³

2nd titration: 26.20cm³ - 1.60cm³ = 24.60cm³

3rd titration: 26.55cm³ - 2.00cm³ = 24.55cm³

Sum of volumes: 24.80cm³ + 24.60cm³ + 24.55cm³ = 74.95cm³

Mean volume: 74.95cm³ / 3 = 24.98cm³

So the mean volume of hydrochloric acid added is 24.98cm³.

Answer:

Coffee Filter.

Tea-bags.

Water Filters.

Sand Filtration.

HEPA Air Filters.

Automotive Filters.

Belt Filters.

Dialysis.

Explanation:

Answer:

pour the rock salt mixture through a filter made from paper and allow the liquid to filtrate

Explanation:

Separating Sand and Salt

Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.

Answer:

Explanation:

720 ml

Answer:

720 ml

Explanation:

Scientific theories are always testable. A theory may be changed as a result of new observations.

A scientific theory is a set of laws, facts and hypotheses that have a complete vision of an aspect of reality.

It is a proposed explanation for a set of observable phenomena.

It allows in this way to organize and understand the observations and to be able to predict or provoke other future observations.

Theories can be modified or improved as more information is collected.

That is, theories can continue to be tested indefinitely, and eventually rejected, if the tests lead to it.  

Therefore, a scientific theory is testable by using a research method.

As mentioned, any theory can be tested or rejected as more information is collected.

This information to prove or reject theories are interpretations of observable facts, which generates new statements or allows to accept those already included in the theory.

Then, a theory may be changed as a result of new observations.

Finally, scientific theories are always testable. A theory may be changed as a result of new observations.

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Answer:

testable & new observations

Explanation:

It's important to utilise immersion oil that is properly matched when employing oil aims. Use only oil that is advised by the unbiased manufacturer.

In the absence of oil, light waves bounce off the slide specimen and travel through the glass cover slip, across the atmosphere, and into the microscope lens . When a wave encounters a new substance, unless it exits at a 90-degree angle, it bends, with the amount of bend depending on the angle. The result warps the image. Oil has a more glass-like index of refraction than does air, which results in a smaller bend. Air has a considerably different index of refraction from glass. An oil-immersed lens can be almost as effective as one made completely of glass because specially prepared oil can have a refractive index that is nearly identical to that of glass (which would be impractical).

Transparent oils with particular optical properties called immersion oils.

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Moles Fe₂O₃ produced : 1.16 moles

Given

2.32 moles of iron

Required

moles of Fe2O3

Solution

The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants and products)

Reaction

4 Fe + 3 O₂ ⇒  2 Fe₂O₃

From the equation, mol ratio Fe : mol Fe₂O₃ = 4 : 2, so mol Fe₂O₃ :

= 2/4 x mol Fe

= 2/4 x 2.32

= 1.16 moles

(a) All the bonds present in urea are polar.

(b) The oxygen atom will carry the partial negative charge at the end of the bond dipole, thus C=O is the most polar bond.

When atoms share their electrons inequitably, polar covalent bonds are formed, whereas non-polar covalent connections are formed when atoms divide their electrons more evenly.The uneven electron sharing is caused by discrepancies in the electronegativities of the two atoms sharing the electrons

(a) All of the bonds in a urea molecule are polar. The compound's formula is [(NH₂)₂CO]. The bonds (C=O, N-H, and C-N) are all polar because to large variances in electronegativities. O has a higher electronegative potential than C, and N has a higher electronegative potential than C and H.

(b) All the bonds present in urea are polar, however, the most polar bond is the connection between carbon and oxygen due to its greater electronegativity than a nitrogen atom (N), thus C=O is the most polar bond.

As the atom that will attracts the electrons due to its electronegative nature, the oxygen atom will carry the partial negative charge at the end of the bond dipole.

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Answer:

(a) (i) 44

(ii) 88 and 36

(iii) 2.2

(b)H₂–C=C–H₂

The mass in grams of 6.54 × 10²¹ atoms of chromium is approximately 0.5642 g.

To determine the mass in grams of 6.54 × 10²¹ atoms of chromium, we need to use the concept of molar mass and Avogadro's number. The molar mass of chromium is given as 52.00 g per mole.
First, we need to convert the given number of atoms into moles by dividing it by Avogadro's number, which is approximately 6.022 × 10²³ atoms per mole.
6.54 × 10²¹ atoms of chromium / 6.022 × 10²³ atoms per mole = 0.01085 moles of chromium
Now that we have the number of moles, we can use the molar mass of chromium to calculate the mass in grams:
0.01085 moles of chromium x 52.00 g per mole = 0.5642 g of chromium
In chemistry, atoms are the basic units of matter that make up everything around us. The mass of an atom is extremely small, so we use a unit called the mole to measure the amount of a substance. Molar mass is the mass of one mole of a substance and is expressed in grams per mole. Avogadro's number is a constant that relates the number of particles in one mole of a substance. Using these concepts, we can calculate the mass in grams of a given number of atoms of a substance. In this example, we used the molar mass of chromium and Avogadro's number to determine the mass in grams of 6.54 × 10²¹ atoms of chromium.

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Answer:

An adaptation occurs if a mutation helps an individual survive and reproduce.

Explanation:

Over generations, the mutation will become more common. An adaptation occurs if a mutation isn't passed on to offspring. Hope this helps! xx

The Process of Animal Pollination. Pollinators come to flowers in search of food (nectar and pollen). During a flower visit, a pollinator may unintentionally brush up against the flower's reproductive parts, depositing pollen from another flower. The pollen is then used by the plant to produce a fruit or seed.