What is the density of iron if it crystallizes in a body-centered cubic unit cell with an edge length of 287 pm

Answer:

Number of Significant Figures

0.0000620  = 6

0.05600  = 3

70820.0  = 5

309100 = 6

Standard Scientific Notation

0.0000620  = 6.2 * \(10^{-5}\)

0.05600  = 5.6 * \(10^{-2}\)

70820.0  = 7.082 * \(10^{4}\)

309100 = 3.091 * \(10^{5}\)

The question is confusing, but if you are saying that the heat of vaporization is 393 joules per gram, and 30 grams condense, then the answer is simply 30 * 393 = 11790 joules.

Answer:

Tinatapon yong food

Explanation:

It's dangerous to eat

If a retail food establishment unknowingly contaminates food with dangerous bacteria, it can lead to foodborne illness outbreaks and pose a risk to public health.

If a retail food establishment, such as a restaurant or grocery store, unknowingly contaminates food with dangerous bacteria, several potential consequences can occur. Firstly, contaminated food can be distributed to customers, increasing the risk of foodborne illnesses. Consuming food contaminated with pathogens like Salmonella, E. coli, or Listeria can result in gastrointestinal symptoms, such as diarrhea, vomiting, and abdominal pain, and in severe cases, it can lead to hospitalization or even death, especially in vulnerable populations.

Secondly, if customers become sick due to consuming contaminated food, it can lead to negative publicity and damage the reputation of the establishment. This can result in a loss of customers, financial implications, and potential legal consequences if negligence is proven.

Additionally, if a foodborne illness outbreak occurs, it may trigger an investigation by local health authorities. The establishment may face inspections, potential closure, and the need for corrective actions to address the contamination issue. Public health agencies may also conduct trace-back investigations to identify the source of the contamination and prevent further spread.

Overall, the unknowing contamination of food with dangerous bacteria in a retail food establishment can have serious consequences, including the risk of foodborne illnesses, negative impact on the establishment's reputation, legal implications, and potential regulatory actions. It highlights the importance of proper food handling, hygiene practices, and regular monitoring to ensure the safety of the food served to the public.

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The calculations show that Mg(OH)₂ has a solubility of  3.5 × 10⁻⁵ M at a pH of 12.80.

The term pH, which stands for "potential of hydrogen ions," can be interpreted as a measurement of the molar concentration of hydrogen ions in a particular solution. Hence, the acidity, neutrality, or basicity of any chemical solution is often determined or specified using the power of hydrogen ions (pH).

Mg(OH)₂⇔Mg²⁺(aq)+2OH⁻(aq)

First of all, we would write the chemical equation for this chemical reaction that is appropriately balanced

The Ksp for the aforementioned chemical reaction is determined mathematically by:

Ksp = [Mg²⁺][OH⁻]²

Ksp = [x][2x]²

1.6 × 10⁻¹³ = 4x³

x = ∛4 × 10⁻¹⁴

x = 3.5 × 10⁻⁵ M.

The maximum amount of a chemical that will dissolve in a particular amount of solvent at a particular temperature is known as its solubility. Different compounds have very varying solubilities, which is a characteristic of a particular solute-solvent pair.

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The total amount of hydrogen gas generated is 9.76 L, under the condition that 15.9 g of hydrochloric acid reacts with excess zine metal.

Furthermore the balanced chemical equation for the reaction between hydrochloric acid and zinc metal is:
2HCl + Zn → ZnCl₂ + H₂
The molar mass of HCl is 36.46 g/mol.
Then, 15.9 g of HCl is equivalent to 15.9 g / 36.46 g/mol = 0.436 mol of HCl.
As per  the balanced chemical equation, 1 mole of HCl reacts with 1 mole of Zn to produce 1 mole of H₂ gas.
Hence, 0.436 mol of HCl will produce 0.436 mol of H₂ gas.
In Stp (Standard Temperature and Pressure), one mole of any gas occupies 22.4 L.
So, 0.436 mol of H₂ gas will occupy:
0.436 mol × 22.4 L/mol = 9.76 L (approx)
Then, approximately 9.76 L of hydrogen gas will be produced when 15.9 g of hydrochloric acid reacts with excess zinc metal at STP.
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Answer:

E = 16 J

Explanation:

We have,

You put scruffy can run up to 2 m/s on his fastest days scruffy has a mass of 8 kg

It is required to find the maximum kinetic energy on his fastest days. If v is the velocity, then kinetic energy is given by :

\(E=\dfrac{1}{2}mv^2\)

Plugging all the values,

\(E=\dfrac{1}{2}\times 8\times 2^2 \\\\E=16\ J\)

So, the maximum kinetic energy on his fastest day is 16 J.

The liquid substance used in the laboratory for dissolving dry mortar on floor flies is hydrochloric acid.

Hydrochloric acid is a strong acid that can dissolve many materials, including dry mortar.

Hydrochloric acid also known as muriatic acid or sulfuric acid, are commonly used to dissolve hardened mortar or concrete residues.

To use hydrochloric acid to dissolve dry mortar, you will need to mix the acid with water in a ratio of 1 part acd to 10 parts water.

You should then apply the mixture to the dry mortar using a brush or spray botle.

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Answer:

Ksp = 7.4x10⁻⁷

Explanation:

Molar solubility of a substance is defined as the amount of moles of that can be dissolved per liter of solution.

Ksp of Zn(OH)₂ is:

Zn(OH)₂(s) ⇄ Zn²⁺ + 2OH⁻

Ksp = [Zn²⁺] [OH⁻]²

And the molar solubility, X, is:

Zn(OH)₂(s) ⇄ Zn²⁺ + 2OH⁻

                 ⇄ X + 2X

Because X are moles of substance dissolved.

Ksp = [X] [2X]²

Ksp = 4X³

As molar solubility, X, is 5.7x10⁻³mol/L:

Ksp = 4X³

Ksp = 4 (5.7x10⁻³mol/L)³

Answer:

Explanation:

We should be offered choices since you were offered some. However I will take a chance on what you should answer.

Oxygen is a non metal. Its most common charge is -2 which means that it has taken on two electrons. It is associated with fire and is an oxidizing agent which is a substance that will take on electrons). It is very reactive.

Answer:

the generation of electricity and other energy jointly, especially the utilization of the steam left over from electricity generation to produce heat.

I hope it helps!! Have a nice day

Answer:

Cogeneration r is the use of a heat engine or power station to generate electricity and useful heat at the same time.

positron emission and electron capture both occur in specific radioactive decays and are associated with unstable nuclei. They play a crucial role in balancing the ratio of protons to neutrons in a nucleus, leading to more stable configurations.

Positrons and electrons are both subatomic particles with opposite charges. Positrons have a positive charge (+1), while electrons have a negative charge (-1). They have the same mass, which is approximately 9.1 x 10^-31 kilograms.

However, positrons and electrons differ in their origins. Positrons are the antiparticles of electrons, meaning they have the same mass but opposite charge. Positrons are typically produced in certain radioactive decays, while electrons are ubiquitous in atoms and play a fundamental role in chemical reactions.

Positron emission occurs when a proton inside an unstable nucleus is converted into a neutron, releasing a positron and a neutrino. This process reduces the atomic number by one while maintaining the mass number. The positron is ejected from the nucleus, carrying away the positive charge.

The positron can cause transmutations by colliding with an electron in the vicinity. The collision results in the annihilation of both particles, converting their masses into energy in the form of gamma rays. This annihilation process contributes to medical imaging techniques like PET scans.

Electron capture happens when an unstable nucleus captures an electron from its electron cloud. The captured electron combines with a proton in the nucleus, resulting in the formation of a neutron and a neutrino. This process also reduces the atomic number by one while preserving the mass number.

Electron capture causes transmutations by changing the composition of the nucleus. By capturing an electron, the number of protons decreases, transforming the element into another one with a lower atomic number.

Positron emissions and electron capture both result in the reduction of atomic number by one. However, positron emission involves the release of a positron from the nucleus, while electron capture involves the capture of an electron by the nucleus. The overall effect is the same—a decrease in atomic number.

Furthermore, positron emission and electron capture both occur in specific radioactive decays and are associated with unstable nuclei. They play a crucial role in balancing the ratio of protons to neutrons in a nucleus, leading to more stable configurations.

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As you can see the picture, in the three given compounds i.e. ethane, ethene and ethyne, ethyne have shortest bond. Bond length of ethyne is very short when compared to the ethane and ethene. Shorter the bond, bond strength will be more. Hence, our answer is ethyne.

Answer:

ethyne has shortest bond

Paper used as a writing material is made of pulp (wood).

Paper is a sheet material used for writing on or printing on (or as a non-waterproof container), usually made by draining cellulose fibres from a suspension in water.

Paper is made from cellulose found in trees, which are the main source of cellulose fibre (or woodpulp). Besides woodpulp, paper can be made from other materials such as cotton, flax, esparto, straw, hemp, manilla and jute.

Wood pulp is usually a softwood, used for pulping to make paper.

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Answer:

if you weigh 100 pounds on Earth, you would weigh only 38 pounds on Mercury. That's because Mercury weighs less than Earth, and therefore its gravity would pull less on your body. If, on the other hand, you were on heavy Jupiter, you would weigh a whopping 253 pounds!

Answer:

lungs

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

density = 2.7 g/mL

volume = 11 mL

The mass is

mass = 2.7 × 11

We have the final answer as

Hope this helps you

Answer:i think its d hope this helps c:

Explanation:

Answer:it would be in group 14 and in period 8.

Explanation:

Answer:

2.36 M

Explanation:

Given,

amount of solute, w = 39.2g

volume of solution, v = 177mL

molecular mass of KNO3, M = 94g

Let concentration be 'S' Molar

now, for finding %(w/v) we need to use the formula

\(w = \frac{SMV}{1000}\) where volume is in mL

\(S = \frac{1000w}{MV}\)

\(S = \frac{1000 X 39.2}{94 X 177}\)

\(S = 2.36 M\)

Composition, C-4 Composition C, the family of plastic explosives that includes C-4, uses RDX as its explosive component. Explosives, a plasticizer to make it pliable, an explosive binder, and typically a marking or odorizing taggant chemical make up C-4.

Explosives producers use RDX powder and water to create a slurry, which is then used to create C-4 blocks. The binder material is then added and mixed using an agitator after being dissolved in a solvent. Distillation is used to remove the solvent, and drying and filtering are used to remove the water.

C-4 is a material that demolition specialists frequently employ in order to complete a task effectively. to remove a single steel beam that is 8 inches (20.3 centimetres) square.

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The question is incomplete compete question is given below

What number was imprinted on the steel plate after the C4 was exploded? 4. What is the leading chemical manufactured in the USA? 5. What is water's pH?

N2O4(g) should have the greatest molar entropy at 298 K. So option C is correct

The molar entropy is a measure of the amount of thermal energy in a substance that is unavailable for doing useful work. It is related to the number of available energy states, or microstates, that a substance can occupy.

At a given temperature, N2O4(g) has more microstates available compared to CH4(g), H2O(l), H2(g), and NaCl(s) due to its molecular complexity and a high degree of molecular motion.

This results in N2O4(g) having a higher molar entropy at 298 K compared to the other substances.

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Approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

The relationship between the initial and final concentrations and volumes must be taken into account.

Given: Initial concentration \((C^1) = 1 M Initial volume (V^1) = 250 mL\)

\((C^2) = 3 M final concentration\)

We can use the equation:

\(C^1 * V^1 = C^2 * V^2\)

Where:

\(V^2\)is the final volume of the solution

Rearranging the equation to solve for V2:

\(V^2 = (C^1 * V^1) / C^2\)

Substituting the given values:

\(V^2 = (1 M * 250 mL) / 3 M\)

\(V^2 = 250 mL / 3\)

\(V^2\) ≈ \(83.33 mL\)

To find the amount of water that needs to be evaporated, we subtract the final volume from the initial volume:

Amount of water to be evaporated = \(V^1 - V^2\)

Amount of water to be evaporated = 250 mL - 83.33 mL

Amount of water to be evaporated ≈ 166.67 mL

Therefore, approximately 166.67 mL of water needs to be evaporated from 250 mL of 1 M Ca(OH)2 to make it 3 M.

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Answer:

bacterial or toxic please

The compound NH4Cl or ammonium chloride is composed of two ions: ammonium ion (NH4+) and chloride ion (Cl-). The ammonium ion is a polyatomic cation made up of one nitrogen atom and four hydrogen atoms, while the chloride ion is a monatomic anion made up of one chlorine atom.

A recreational slide that has water running down it to lessen friction, sometimes requiring the user to sit on a mat or raft, and occasionally ending in a pool.

In Faribault, Minnesota, lived Herbert Sellner. His career as a designer began with the creation of furniture, followed by the design of children's toys and, most notably, the Water-Toboggan Slide. The slide, constructed in 1923, was a wooden sled that guests could sit on and ride down an incline into a lake.

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Answer:

Am I the bad guy for killing my fish, let me explain?

Explanation:

The fish said a bad word that was incredibly inappropriate, so then I told him to never say that again. He responds with, "No, I CAN SAY WHATEVER I WANT." After that I told him to not yell at me and then I killed him, remember he's a fish (GoldFISH).

It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.

A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.

Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.

The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.

The strength of the bond is in the following order: H.....F > H.....O > H......N

The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.

Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.

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Answer:uses world like

Explanation:

Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. (Mg2+).To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this.

Oxidation and reduction occurred in test tube 5. Here is the equation for the reaction that took place:MgSO4 (aq) + Cu (s) CuSO4 (aq) + MgCuSO4's blue hue was neutralised to a solid copper hue. Copper atoms (Cu) were created by reducing copper ions (Cu2+). An illustration of a reduction reaction is this. Cu atoms are created when Cu2+ gains electrons. Due to the presence of magnesium ions (Mg2+), the solution was greenish-yellow.To create Mg2+ ions, Mg atoms lost their electrons. An example of an oxidation reaction is this. Two electrons were lost by the magnesium atom, leaving two electrons behind.

As a result, test tube 5 experienced both oxidation and reduction.It is possible to prove that oxidation, reduction, or both took place through the reaction's electron transfer and colour changes. A reduction reaction was seen when copper ions transformed into copper atoms. An oxidation reaction was evident when magnesium atoms transformed into magnesium ions.

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