The mass of a block is 12 g and the volume is 6 ml. Calculate the density of the block. (science)

Answer:

Toxic is a harmful chemical substances which degrades the quality of pure substance .

A total of 1.66 moles of NH₃ formed when 5 moles of CuO reacts with excess of NH₃.

The balanced equation for the reaction of CuO and NH₃ is given as,

3CuO + 2NH₃ → N₂ + 3H₂O + Cu

Now, as we can see, 3 moles of CuO reacts completely with 2 moles of NH₃ to form 1 mole of N₂ gas. It is given that 5.0 moles of CuO reacts with excess NH₃.

So, we should write,

3 moles CuO = 1 mole N₂

1 mole CuO = 1/3 moles N₂

For 5 moles of CuO,

5 mole CuO = 5/3 moles of N₂

So, when 5 moles of CuO reacts with NH₃, 1.66 molos of N₂ are formed.

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Arsenic, hydraulic fracturing, lead, and PFAS present chemical threats to global drinking water supplies in different ways.

Let's discuss each of them in detail:

(a) Arsenic - The origin of arsenic exposure is natural deposits or contamination from agricultural or industrial practices. Human health consequences include skin, lung, liver, and bladder cancers. It can also lead to cardiovascular diseases, skin lesions, and neurodevelopmental effects. Drivers of continued exposure include poor regulation and monitoring. Modern solutions include rainwater harvesting and treatment.

(b) Hydraulic fracturing - Hydraulic fracturing involves using a mixture of chemicals, water, and sand to extract natural gas and oil from shale rock formations. The origin of exposure is contaminated surface and groundwater due to the release of chemicals from fracking fluids and other sources. Human health consequences include skin, eye, and respiratory irritation, headaches, dizziness, and reproductive and developmental problems. Drivers of continued exposure include lack of regulation and poor oversight. Modern solutions include alternative energy sources and regulation of the industry.

(c) Lead - Lead contamination in drinking water can occur due to corrosion of plumbing materials. Human health consequences include neurological damage, developmental delays, anemia, and hypertension. Drivers of continued exposure include aging infrastructure and poor maintenance. Modern solutions include replacing lead service lines, testing for lead levels, and implementing corrosion control.

(d) PFAS - PFAS (per- and polyfluoroalkyl substances) are human-made chemicals used in a variety of consumer and industrial products. They can enter the water supply through wastewater discharges, firefighting foams, and other sources. Human health consequences include developmental effects, immune system damage, cancer, and thyroid hormone disruption. Drivers of continued exposure include the continued use of PFAS in consumer and industrial products. Modern solutions include reducing the use of PFAS in products and treatment methods such as granular activated carbon.

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theAnswer:A

Explanation:

Edible mushrooms: Consuming edible mushrooms is safe and provides health advantages like fiber, vitamins, and minerals.

Non-Edible mushrooms: Mushrooms that cannot be eaten could be harmful or have unappealing flavors and textures that could be harmful if consumed.

Answer:

2 energy levels

Explanation:

Answer:

Mass and Volume

Explanation:

The formula for density is

\(\frac{Mass}{Volume}\)

The molecular formula of the unknown gas is C4H10 is the gas.

Solution:

moles H = 17 / 1.008 = 16.9

moles of C = 83/12 =6.91

so ratio of H to C = 16.9/ 6.91 = 2.45

C H 2.5 to get whole numbers multiply by 2 C2H5 = empirical formula = molar mass = 29 g/mol

apply Graham's law to get the molar mass of the unknown gas

0.87 / 1= sq.rt ( 44/x)

x = 58 g/mol

58/29= 2

C4H10 is the gas

One mole is defined as the amount of substance containing as many units as there are atoms in 12 grams of carbon. This is 6.022 x 10-23, also known as Avogadro's number. Mole volume at STP can be used to convert moles to gas volumes and gas volumes to moles. Whenever you write a chemical formula, write all gases in molecular form.

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Scientists believe that dark matter is more prevalent in the universe than dark energy. Dark matter is estimated to make up approximately 27% of the universe, while dark energy is thought to account for around 68%. The remaining 5% of the universe is made up of visible matter such as stars and galaxies.

Dark matter is a form of matter that does not interact with light or any other electromagnetic radiation, making it invisible to telescopes. It is only detected through its gravitational effects on visible matter. Scientists hypothesize that dark matter plays a crucial role in holding galaxies together and in the large-scale structure of the universe.

On the other hand, dark energy is a mysterious force that is thought to be responsible for the accelerating expansion of the universe. Unlike dark matter, dark energy does not interact with matter at all, and its nature and origin remain largely unknown.

In summary, while both dark matter and dark energy are still not fully understood, scientists believe that dark matter is more prevalent in the universe than dark energy.

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Answer:

beacuse it can form again after melted or destroied

Answer:

If there were multiple products, we can take each product and mixed with a sample of a pure compound that we suspect might be the same as the product. Then, we taking the melting point of this mixture that contains one of our product and pure sample. Then, we can observe the change in melting point, if there is no change in melting point or the melting stays in the same range of the pure compound. Then, the that product along with the pure sample are actually the same compound, not a mixture of two compounds. However, if the melting point for our pure sample compound changed or didn't stay in the same range after the mixing with on of our products. then we can conclude that this product and the pure sample are completely different compound, and indeed they are a mixture.

The pH of 0.779 M ethylammonium chloride (C2H5NH3Cl) is 10.08. What is ethylammonium chloride? Ethylammonium chloride is a chloride salt that is formed from the reaction between ethylamine and hydrochloric acid.

Ethylamine (C2H5NH2) is the primary component in the synthesis of ethylammonium chloride. When ethylamine is added to hydrochloric acid, a white solid is formed that has the chemical composition C2H5NH3Cl.How to find pH of ethylammonium chloride?The Kb value for ethylamine is given as 4.3 x 10^-4.

The reaction for ethylamine is:C2H5NH2(aq) + H2O(l) ⇌ C2H5NH3+(aq) + OH-(aq)We can assume that ethylammonium chloride is completely ionized. So, we can write:C2H5NH3Cl → C2H5NH3+ + Cl-The hydrolysis of the ethylammonium ion is given by the following equation: C2H5NH3+ (aq) + H2O(l) ⇌ C2H5NH2(aq) + H3O+(aq)Therefore, Kb = [C2H5NH2][H3O+]/[C2H5NH3+]Let's assume x is the H3O+ ion concentration. Then [C2H5NH2] = [H3O+] and [C2H5NH3+] = 0.779 - x.Substituting these values in the above equation, we get the equation: 4.3 x 10^-4 = x^2 / (0.779 - x)By solving the above equation, we can get x, which is the H3O+ ion concentration. Once we get x, we can calculate the pH of the solution, which is given by the equation:pH = - log [H3O+]Finally, by substituting the value of [H3O+] we get the pH of the solution. PH of the solution is 10.08.

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Answer:

a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

Hope this helped!!!

Answer:

Empirical formulas show the simplest whole-number ratio of atoms in a compound

Explanation:

Among the options provided, the correct formula and chemical name combination is:

PCI₂ represents phosphorus tetrachloride. The other combinations listed are not correct:

C D Q Zoom X N₂O₂ is not a valid chemical formula or name combination.

N₂O is dinitrogen monoxide (commonly known as nitrous oxide), not dinitrogen pentoxide.

Ca₂P represents calcium phosphide, not dicalcium diphosphide.

Therefore, the correct combination is PCI₂, which stands for phosphorus tetrachloride.

Phosphorus tetrachloride (PCI₂) is a chemical compound composed of one phosphorus atom bonded to two chlorine atoms. It is a colorless, toxic, and reactive liquid with a pungent odor. PCI₂ is commonly used as a precursor in various chemical reactions and synthesis processes.

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Answer:

Since chlorine gained an electron it has 17 protons and 18 electrons. This makes chloride a negative ion with a charge of −1.

Explanation:

I only know that fact in chemistry before I quit the classes.

\(\huge \bf༆ Answer ༄\)

The Correct choice is ~ A

Isotopes are the elements with same Atomic Number but different masses ~

Answer:

In the picture.

I hope it helps

Explanation:

Nitrogen cycle is a complex process (or sequence of reaction) by which nitrogen is removed and added to the soil.

Answer:Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml

Explanation:

Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml

Answer: 7.24 atm

Explanation: To find the total pressure in the tank, we need to convert all of the pressures to the same unit. Let's convert the pressures to atmospheres (atm), since that is the unit requested in the question:

6.1 atm (given)

464 mmHg = 0.611 atm (since 1 atm = 760 mmHg)

7.69 psi = 0.529 atm (since 1 atm = 14.7 psi)

Now, we can add the pressures to find the total pressure in the tank:

Total pressure = 6.1 atm + 0.611 atm + 0.529 atm = 7.24 atm (rounded to two significant figures)

Therefore, the total pressure in the tank is 7.24 atm.

a. Decreasing alpha from 0.05 to 0.01 makes the significance level more stringent. You will be less likely to reject the null hypothesis, even when it's false. This increases the probability of a Type II error, thus potentially reducing the power of the test. The power curve will shift to the left.

b. If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

The power curve is a graph that shows the probability of rejecting the null hypothesis as a function of the true value of the mean.

In the given scenarios of this study, Reducing the significance level and reducing the sample size will shift the power curve to the left, indicating a decrease in the statistical power of the test.

The power of a statistical test is the probability that it correctly rejects the null hypothesis when the alternative hypothesis is true.

a) Reducing alpha from 0.05 to 0.01 means that we are more stringent in our assessment of whether the new treatment is effective.

This will result in a decrease in the power of the test, meaning that it is less likely that we will be able to detect a difference between the new treatment and the previous treatment.

b) If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.

This is because a smaller sample size decreases the power of the test. A larger sample size provides more information and thus makes it more likely to correctly reject the null hypothesis when the alternative hypothesis is true.

Therefore, by reducing the sample size, you are decreasing the likelihood of detecting a true effect if one exists, thus reducing the power of the test.

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When the deadline arrived, the laboratory was still in violation of the standards. This situation describes a "continued" violation.

OSHA identified a safety issue in the film development laboratory and provided a deadline to correct it. Since the laboratory did not address the problem within the given timeframe, it remains in violation of the standards, resulting in a continued violation.

OSHA (Occupational Safety and Health Administration) is a government agency responsible for ensuring safe and healthy working conditions for employees in the United States. As part of their duties, OSHA conducts regular inspections of workplaces to identify any safety hazards or violations of their standards.

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The correct option is option d 1.24

What is dipole moment?

A dipole moment forms in any system where the charges are dispersed. A dipole moment could be created by both covalent and ionic bonding. The development of the dipole moments is caused by the difference in electronegativity. Electronegativity describes the chemical bonding between these two atoms.

A bond dipole moment measures the polarity between two atoms in a molecule. Bond dipole and the concept of electric dipole moment are connected. It evaluates how effectively a system separates positive and negative charges. The bond dipole moment has magnitude and direction because it is a vector quantity.

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One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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Liquids don't have a definite shape and occupy a fixed volume. They are substances that exist in the liquid state. They take the form of their containers and are slightly compressible. Gases (materials that are in the gaseous state) don't have a fixed shape or take up a set amount of space.

The variations in their molecules account for these many states of matter. Solids, for instance, have a distinct shape and dimension. Liquids, on the other hand, can bend and will conform to the shape of the container they are in. Finally, gases disperse to entirely occupy the space that is accessible. Liquids don't have a definite shape and occupy a fixed volume. They are substances that exist in the liquid state. They take the form of their containers and are slightly compressible. Gases (materials that are in the gaseous form) don't have a defined shape or take up a certain amount of space.

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Answer:

The uses of hydrogen gas are to produce electricity, heat, power, fertilizer, and many more.

Hope this helps :)

Answer:

4.73 mol NH

Explanation:

What we're doing here is calculating basic mole-mole relationships, something that you'll be doing quite a bit!

The steps to solving mole-mole problems like this are

write the balanced chemical equation for the reaction (this is given)

divide the number of moles of the given known substance (3.55) by that substance's coefficient in the chemical equation (3)

multiply that number by the coefficient of the substance you're trying to find (4)

Using simple dimensional analysis, it looks like this:

Answer:

4.68 H2O is needed to make 3.12 moles of NH3

Explanation:

Using stoichiometry, we can convert Moles of NH3 into Moles of H20

since we're converting moles to moles, we take the given mole of NH3

3.12, and multiply it by the Mole ratio, which in this case is (H20/NH3) or (6/4)

so then: 3.12 * 6/4 = 4.68 mols of H2O