In a sample of a solid the particles are


A.
not moving.

B.
vibrating about a fixed position.

C.
sliding past each other.

D.
moving independently around the container.

The empirical formula of the compound is \(N_2O_5\), indicating that it contains two nitrogen atoms and five oxygen atoms in the simplest whole-number ratio.

the empirical formula of the compound, we need to determine the simplest whole-number ratio of atoms present in the sample.

1: Find the number of moles of each element.

Number of moles of nitrogen = 0.522 g / molar mass of nitrogen

Number of moles of oxygen = 1.490 g / molar mass of oxygen

2: Determine the ratio of moles.

Divide the number of moles of each element by the smallest number of moles obtained in Step 1.

3: Write the empirical formula.

Write the elements' symbols using the whole-number ratio obtained in Step 2.

\(N_2O_5\)

Calculate it step by step:

1:

Molar mass of nitrogen (N) = 14.01 g/mol

Molar mass of oxygen (O) = 16.00 g/mol

Number of moles of nitrogen = 0.522 g / 14.01 g/mol ≈ 0.03725 mol

Number of moles of oxygen = 1.490 g / 16.00 g/mol ≈ 0.09313 mol

2:

Divide by the smallest number of moles (0.03725 mol):

Nitrogen: 0.03725 mol / 0.03725 mol ≈ 1

Oxygen: 0.09313 mol / 0.03725 mol ≈ 2.5

3:

Since we need to have whole numbers, we multiply the ratio by 2:

Nitrogen: 1 × 2 = 2

Oxygen: 2.5 × 2 = 5

The empirical formula of the compound is \(N_2O_5\).

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If the pharmacy stocks 35% omeprazole suspension, it required 160 ml of the 35% omeprazole suspension for the dilution.

It is required to apply the idea of dilution equations to determine the quantity of 35% omeprazole suspension required for dilution.

Let C₁ be the concentration of the 8% omeprazole suspension (8%), and let V₁ be the volume of the 0.7 L 8% omeprazole suspension.

Let C₂ be the concentration of the 35% omeprazole suspension, and let V₂ be the volume of the 35% omeprazole suspension that we need to find.

The dilution equation states that the product of the starting volume and concentration (V₁ × C₁) and the end volume and concentration (V₂ × C₂) should be identical.

V₁ × C₁ = V₂ × C₂

Putting the given values:

0.7 L ×  8% = V₂  × 35%

0.056 L = V₂ × 35%

Dividing both sides by 0.35), get:

V₂ = 0.056 L / 0.35

V₂ = 0.16 L

Change 0.16 L to milliliters (ml):

0.16 L × 1000 ml/L = 160 ml

Thus, 160 ml of the 35% omeprazole suspension would be required for the dilution.

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Answer:

A, option is the correct answer of this question

Answer:

H= Planck's Constant

Explanation:

Since light is bundled up into photons, Einstein theorized that when a photon falls on the surface of a metal, the entire photon's energy is transferred to the electron.

Answer: . Its B. E = hv

Explanation:

Answer:

yes the answer is c

Explanation:

If a block has the following dimensions: length of 2.50 cm. width of

1.00 cm and height of 2.00 cm. The density of the density of the block is: 30.0 g/cm^3.

The volume of the block can be calculated by multiplying the length, width and height:

V = 2.50 cm x 1.00 cm x 2.00 cm = 5.00 cm^3

The density of the block can then be calculated by dividing the mass by the volume:

Density = mass/volume

Density = 150.0 g / 5.00 cm^3

Density = 30.0 g/cm^3

Therefore the density is  30.0 g/cm^3.

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Answer:

Oxygen

Explanation:

Given the following question:

The following atom has 7 protons (plus charge)
The following atom has 8 neutrons (negative charge)
The following atom has 7 electrons since the number of electrons are equal to the number of protons the atom has.

The following atom is oxygen with a mass number of 16: (see photo below)
Let the red represent protons...
Let the gray represent the neutrons...
Let the blue represent the electrons...

Hope this helps.

D. The lines connect points of equal air pressure.

Answer:

Both have the same amount of particles.

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ particles.

This implies that 1 mole of Hydrogen contains 6.02×10²³ particles. Also, 1 mole of oxygen contains 6.02×10²³ particles.

Thus, 1 mole of Hydrogen and 1 mole of oxygen contains the same number of particles.

Answer:

The framework

The metal skeletal portion of a partial denture to which the remaining units are attached is called the framework.

The framework is the foundation of a partial denture and is made of a metal alloy, such as cobalt-chromium or titanium, to provide strength and support to the artificial teeth. It is custom-fabricated based on an impression of the patient's mouth and is designed to fit snugly around the remaining teeth and gums.

The artificial teeth and acrylic resin are then attached to the framework to create a functional and aesthetic partial denture.

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Answer:

787.5 is a transversal of lines I and m that forms 8 angles and the other way around the world health organization and the other one is a transversal of lines I and m that forms 8 angles and the other things that you can see in the picture of with the first term 8 and a common ratio of the following values would be a little different to the one you have the

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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Answer:

Both bacteria and fungi rely on living organisms to reproduce and survive.

Most bacteria and fungi are harmless and may be beneficial to other

living things. So, the correct option is (A).

Bacteria and fungi are two types of organisms that belong to different class of organisms while they are prokaryotic and eukaryotic in nature respectively. They are present in various life forms like parasitic (bacteria), saprophytic (fungi) etc. They are harmless in nature and can be beneficial to other living things as well.

They have mutual relationships with other living organisms, which are beneficial to both.

For example, some species of bacteria help fix nitrogen in the root nodules of leguminous plants, while fungi form a mutualistic relationship with algae called lichens where they benefit each other in one way or another.

Thus, most bacteria and fungi are harmless and may be beneficial to other living things. So, the correct option is (A).

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The 6¹⁴ text(c) activity of an ancient artifact is found to be 0.170 bq per gram of carbon. 49,305 is its age of ancient artifact.

To find the age of the artifact, we can use the formula for exponential decay:
N(t) = N₀ e(-λt)
Where N0 is the initial amount of 6¹⁴ text(c), N(t) is the current amount, λ is the decay constant (which is related to the half-life), and t is the time elapsed.
We know that the half-life of 6¹⁴ text(c) is 5730 years. This means that after 5730 years, half of the initial amount of 6¹⁴ text(c) will have decayed. So, we can find λ as follows:
λ = ln(2) / t1/2
λ = ln(2) / 5730
λ = 0.000120968
Now, we can use the activity of the artifact to find the current amount of 6¹⁴ text(c):
A = λN
N = A / λ
N = 0.170 / 0.000120968
N = 1403.94
So, the artifact currently has 1403.94 grams of 6¹⁴ text(c). We can use this value and the known initial amount of 6¹⁴ text(c) (which would have been present in the organism when it died) to find the age of the artifact:
N(t) = N₀ e(-λt)
1403.94 = N₀e(-0.000120968t)
We can solve for t:
ln(1403.94/N0) = -0.000120968t
t = -ln(1403.94/N0) / 0.000120968
We don't know the exact initial amount of 6¹⁴ text(c) in the organism, but we can assume it was the same as the current amount in the atmosphere (which is about 1.2 × 10¹² grams). So:
t = -ln(1403.94/1.2e12) / 0.000120968
t = 49,305 years
Therefore, the artifact is approximately 49,305 years old.

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Answer:

C

Explanation:

19 is the answer, because it is the atomic number of potassium. Hope it helps!

If the engineers are trying to increase the acceleration of the car, they have to decrease the mass of the car.

The Newtons laws of motion form the basis of the discussion about motion. We know that from the second law of Newton F = ma

Thus, if the engineers are trying to increase the acceleration of the car, they have to decrease the mass of the car.

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Using the given mass of the compound (0.520 g) and the calculated moles, we can determine the molar mass of the compound.

To find the molar mass of the compound, we can use the formula:

ΔT = Kf * m

where ΔT is the freezing point depression, Kf is the cryoscopic constant (in this case, 3.90 °C/m), and m is the molality of the solution.

First, we need to calculate the molality (m) of the solution:

m = moles of solute / mass of solvent (in kg)

The mass of the solvent (lauric acid) is given as 4.62 g. Since the unknown compound is a solute, we need to convert its mass to moles:

moles = mass / molar mass

Given that the mass of the unknown compound is 0.520 g, we can now calculate the moles of the compound.

Next, we convert the mass of the solvent to kg by dividing by 1000:

mass of solvent (lauric acid) = 4.62 g / 1000 = 0.00462 kg

Now we can calculate the molality:

m = moles of solute / mass of solvent = (moles of the compound) / (mass of solvent)

Finally, we can use the freezing point depression formula to find the molar mass of the compound:

ΔT = Kf * m

Substituting the given values:

4.20 °C = 3.90 °C/m * m

Now solve for m:

m = (4.20 °C) / (3.90 °C/m)

Once we have the molality, we can calculate the moles of the compound:

moles = molality * mass of solvent (in kg)

Finally, we calculate the molar mass:

molar mass = mass of solute / moles of solute

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The equator of the sun rotates faster than the poles.

The equator of the sun rotates faster than its poles. This is known as differential rotation, and it is due to the fact that the sun is not a solid body, but is composed of gas and plasma. The equatorial regions of the sun rotate faster because they are farther from the center of the sun, where the gravitational pull is stronger, and thus experience less resistance to their motion.

The period of rotation of the equator of the sun is shorter than that of the poles. The equator rotates once every 25.4 days, while the poles rotate once every 36 days.

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Answer:

Explanation:

Halogen: Cl2

Alkali metal: Na

Lanthanide: Promethium

Transition metal: Gold

Alkaline Earth metal: Beryllium

Noble Gas: Neon

Answer:

1.3175675675675604

Explanation:

does this need to be rounded?

Answer:

U

Explanation:

UUUUUUUUUUUUUU

The value of the dissociation constant, kd, for the complex ion Zn(NH₃)₄²⁺ is 3.4 × 10⁻¹⁰.

the dissociation of Zn(NH₃)₄²⁺ is given as follows :

                    kd

Zn(NH₃)₄²⁺(qa)   ⇄   Zn²⁺(aq)   +  4NH₃(aq)

                      kf

the dissociation constant kd is given as :

kd = [Zn²⁺] [ NH₃]⁴ / [ Zn(NH₃)₄²⁺ ]

the kf is the reciprocal of the kd , that means :

kd = 1 / kf

the kf  for Zn(NH₃)₄²⁺ is 2.9 × 10⁹

therefore :

kd = 1 /  2.9 × 10⁹

kd = 0.344 × 10⁻⁹

kd = 3.4 × 10⁻¹⁰.

Thus, the dissociation constant Zn(NH₃)₄²⁺ is 3.4 × 10⁻¹⁰.

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The oxidation reduction reaction are given below.

Oxidation half reaction:

Zn° →Zn² + 2e-

Reduction half reaction:

2Mn^5 +4e^- → 2Mn^2+

Belo w are the oxidation and reduction reaction of the common alkaline batteries to produce electricity.

Oxidation half reaction:

Zn° →Zn² + 2e-

Reduction half reaction:

2Mn^5 +4e^- → 2Mn^2+

To balance the overall reaction, we need to multiply each half reaction by appropriate coefficients to ensure that the electrons cancel out.

Here is the balance overall reaction.
2Zn° + 2Mn^5 → 2Zn² + 2Mn²+

The balanced equation shows that in alkaline batteries, zinc metal is oxidized to form zinc ion, while manganese ions are reduced to manganese(II) ions. The oxidation reduction reaction    generate an electric current as a result of the flow of electrons.

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Answer:

maybe maybe maybe maybe

Explanation:

What would be the new volume if the pressure on 600 mL is increased from 90 kPa to 150 kPa? V = Pu V₂ = 360 mL ~ 400 mL 6.

Answer:

Hydrogen

Explanation:

Molecules that can only participate in hydrogen bonding are N, O, and F due to their electronegativity.

The appropriate formula for Old man Walter to know the exact amount and elements needed to make the chemical is the Chemical/Molecular formula.

The Chemical/Molecular formula represents the composition of a compound in terms of the number of atoms of each element present.

This formula provides detailed information about the elements and their proportions in the compound, allowing Old man Walter to understand the exact amount of each element needed.

Structural formula, on the other hand, shows the arrangement of atoms and their bonds in the molecule but doesn't necessarily indicate the exact amounts of each element needed.

Empirical formula shows the simplest whole-number ratio of the elements in a compound but not the actual number of atoms present. The quadratic equation is unrelated to chemistry and won't be helpful in this context.

To help Old man Walter understand the exact amount and elements needed to make the chemical, you should provide him with the Chemical/Molecular formula of the compound.

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Answer:

Catalysts play a significant role in transesterification of vegetable oils. ... Eggshell has a large amount of calcium carbonate that can be ...

‎Abstract · ‎Introduction · ‎Catalysis in transesterification · ‎Conclusion and prospects

Explanation:

The industrial production of biodiesel is catalyzed by calcium carbonate catalyst which increases the rate of reaction many folds. The cost of catalyzed reaction decreases as activation energy decreases.

Catalyst is a substance that enhance the rate of any chemical reaction without participating in the chemical reaction. Catalyst generally increases the rate of reaction by lowering the activation energy of that chemical reaction.

Biodiesel is formed by reaction of vegetable oil. For the conversion of vegetable oil to biodiesel oil we use calcium carbonate as catalyst.

As we said earlier that catalyst reduces activation energy that means requires less energy for conversion. So we need lower cost to provider lower energy. Hence use of catalyst reduces costs.

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