Question 2
According to EPA which is not a characteristic of hazardous waste.
a. friability
b. toxicity
c. reactivity
d. corrosivity

The most common problem associated with the disposal of hazardous waste is leaching from landfills and dumps.

This can lead to groundwater contamination and create a hazardous environment for both human and animal life. Additionally, hazardous waste sites can become breeding grounds for insects and other pests, exacerbating the problem. Unauthorized dumping can also contribute to the problem of hazardous waste disposal, as it can lead to contamination of the environment in unexpected areas.

The most common problem associated with the disposal of hazardous waste is:
c. groundwater contamination.

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If dibenzalacetone separates as an oil, you can follow this sequence of 3 steps to recover it: Cooling; Filtration;  Washing and drying.

1. Cooling: First, cool down the reaction mixture to promote the solidification of the dibenzalacetone oil. This can be done by placing the container in an ice bath or allowing it to reach room temperature.
2. Filtration: Next, use a vacuum filtration setup to separate the solid dibenzalacetone from the liquid solution. Place a filter paper on a Buchner funnel, and apply a vacuum to draw the liquid through the filter, leaving the solid dibenzalacetone on the filter paper.
3. Washing and drying: Finally, wash the solid dibenzalacetone with a suitable solvent, such as cold ethanol or hexane, to remove any impurities. Then, allow the washed dibenzalacetone to air dry on the filter paper, or use a gentle stream of air to speed up the drying process.
By following these steps in sequence, you can successfully recover dibenzalacetone if it separates as an oil.

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The time required for the reaction to be 75% complete is approximately 231 seconds, which is option C.

A first-order reaction follows the rate law:

rate = k[A], where k is the rate constant and [A] is the concentration of the reactant. The integrated rate law for a first-order reaction is given by:

ln([A]t/[A]0) = -kt

where [A]t is the concentration of the reactant at time t, [A]0 is the initial concentration, and k is the rate constant.

We are given that the rate constant is 3.00 x 10^-3 s^-1. We can use the integrated rate law to determine the time required for the reaction to be 75% complete.

Let [A]t/[A]0 = 0.25, since the reaction is 75% complete. Substituting this value and the given rate constant into the integrated rate law, we get:

ln(0.25) = -3.00 x 10^-3 t

Solving for t, we get:

t = -ln(0.25)/3.00 x 10^-3 ≈ 231 s.

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A pair of valence electrons that are not shared between atoms are called unshared pairs.

These unshared pairs are also sometimes referred to as lone pairs or non-bonding pairs. They are important in determining the shape and properties of molecules, as they can influence the molecule's polarity and reactivity. For example, in a water molecule, the two unshared pairs of electrons on the oxygen atom give it a bent shape and make it a polar molecule. In organic chemistry, unshared pairs on nitrogen, oxygen, and sulfur atoms can participate in various reactions such as nucleophilic substitution and acid-base reactions. Covalent bonds involve the sharing of electrons between atoms, but unshared pairs remain associated with a single atom and contribute to the stability of the electron arrangement in that atom.

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The final temperature of the mixture is closest to C. 30 C

The temperature of the mixture will depend on the amount of heat transferred between the two bodies of water. We can use the formula Q = mcΔT, where Q is the heat transferred, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

First, we need to find the initial heat content of the 40°C water and the 20°C water. For the 40°C water, we have:

Q1 = (50 g) (4.18 J/g°C) (40°C) = 8,360 J

For the 20°C water, we have:

Q2 = (30 g) (4.18 J/g°C) (20°C) = 2,514 J

When we mix the two waters together, they will eventually reach a final temperature that is somewhere in between 40°C and 20°C. Let's call this final temperature T. The total heat content of the mixture is then:

Qtotal = (50 g + 30 g) (4.18 J/g°C) (T - 20°C)

Since the insulated cup has negligible heat capacity, we can assume that no heat is lost to the surroundings. Therefore, the total heat content of the mixture is equal to the initial heat content of the 40°C water plus the initial heat content of the 20°C water:

Qtotal = Q1 + Q2

Substituting the values we calculated earlier and solving for T, we get:

(50 g + 30 g) (4.18 J/g°C) (T - 20°C) = 8,360 J + 2,514 J

T - 20°C = (10,874 J) / [(50 g + 30 g) (4.18 J/g°C)]

T - 20°C = 9.95°C

T = 29.95°C

The final temperature of the mixture is closest to 30°C. and therefore Option C is correct.

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Answer is down below!

Explanation:

You are conducting a calorimetry experiment using a calorimeter with 500 mL of water in its outer chamber to determine the enthalpy of reaction of a chemical reaction. The initial temperature of the water was 25 °C. After the reaction, the temperature of the water was 57.4 °C. Disregarding any heat loss to the walls of the container, calculate the Hf). (The specific heat of the water is 4.18 J/ (g*K)

Gibbs Free Energy (∆G) which helps predict the spontaneity of a reaction. If ∆G is negative, reactants will convert to products. If ∆G is positive, products will convert to reactants.

If ∆G (Gibbs free energy change) is negative (∆G < 0), reactants will spontaneously convert to products, indicating a thermodynamically favorable process. A negative ∆G indicates that the products have lower free energy than the reactants, and the reaction is spontaneous and exergonic.

If ∆G is positive (∆G > 0), products will not spontaneously convert to reactants, indicating a thermodynamically unfavorable process. A positive ∆G indicates that the products have higher free energy than the reactants, and the reaction is non-spontaneous and endergonic.

If ∆G is exactly zero (∆G = 0), the system is at equilibrium, and the reaction is in a state of dynamic balance where the forward and reverse reactions occur at equal rates, with no net change in the concentrations of reactants and products over time.

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Arrhenius is postulated in 200 years after that fluids can dissolve many compounds by dividing them into their constituent ions. He argued that acids contain helium and that when they dissolve in water, they release hydrogen.

Pursuant to the Arrhenius the hypothesis, acidic is a component that produces hydrogen ion in freshwater. With fluid, basic elements emit the ion hydroxide. According to the Bronsted-Lowry theory, an acid is a proton giver while a base is a recipient of protons.

Bases are chemicals that, while dispersed into water, establish hydroxide ions (OH-). Bases and acids. Any material that ionises when dissolved in liquid to give a charge called H+ and hydrogen called an Arrhenius acid. When submerged in fluid, an Arrhenius foundation is a material the fact that releases the OH-, or hydroxide, the ion.

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The word summary paragraph discussing this experiment and the results  are given below

In the experiment, a vegetable indicator was used to test the pH levels of various liquids. When break was bubbled into the water, the vegetable indicator curve from a purple color to yellow-green, displaying that the pH level had become more sour.

Cabbage indicator turned red in acidic club soda due to carbonic acid formation from dissolved carbon dioxide.

This lab shows the connection between pH and that of carbon dioxide levels in the air/water. More carbon dioxide in the air can lead to greater absorption in the ocean, leading to ocean acidification and lower pH.

An example of the principles shown in this lab is the effect of carbon emissions on ocean acidification. Lab shows how carbon emissions impact ocean acidification as more CO2 is absorbed causing pH levels to decrease. This harms marine life by disrupting shell formation and reducing food availability.

The above occurred cause carbon dioxide from the respite argue the water to form carbonic acid, that lowered the pH level. Within the clear refreshment, the cabbage sign turned pink, meaning a tall pH level, as these drinks hold carbonates and other shots for weaponry that raise the pH level.

The experiment shown in this put lab are clear in everyday growth, such as within the utilize of solvent base to neutralize richness stomach corrosive. The comes about of the test highlight the affect that human conduct can have on the environment and the have to be make tolerable determinations in our day by day lives.

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C: Percentage of atomic mass ≈ 3.22 mol and the mole ratio ≈ 2  

H:  Percentage of atomic mass ≈ 9.66 mol and mole ratio ≈ 6

S:  Percentage of atomic mass ≈ 1.61 mol and mole ratio ≈ 1
The empirical formula is therefore C2H6S, which corresponds to option A.

To find the empirical formula of the organic thiol compound, we need to determine the simplest whole-number ratio of atomic mass present in the compound. We can assume a 100g sample of the compound, which means we have:
38.66g C
9.73g H
51.61g S

Next, we need to convert these masses to moles by dividing them by their respective molar masses:
38.66g C / 12.01 g/mol = 3.219 mol C
9.73g H / 1.01 g/mol = 9.633 mol H
51.61g S / 32.06 g/mol = 1.608 mol S

We then divide each of these mole values by the smallest value (in this case, 1.608 mol S) to get the mole ratio of the elements:
C: 3.219 mol / 1.608 mol = 2.00
H: 9.633 mol / 1.608 mol = 5.99 (approx. 6)
S: 1.608 mol / 1.608 mol = 1.00

Now we need to express this ratio in whole numbers by dividing each value by the smallest value (in this case, 1.00):
C: 2.00 / 1.00 = 2
H: 6 / 1.00 = 6
S: 1.00 / 1.00 = 1

Therefore, the empirical formula of the organic thiol compound is C2H6S, which corresponds to answer choice A.

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the daughter nucleus (nuclide) produced when Pb-211 undergoes beta decay by emitting an electron is Bi-211.

When Pb-211 undergoes beta decay, it transforms into a new nuclide by emitting an electron. Beta decay occurs when a neutron in the nucleus of an atom is transformed into a proton, and an electron (known as a beta particle) is emitted from the nucleus.

In this case, Pb-211 decays into Bi-211 through beta-minus decay. Beta-minus decay occurs when a neutron in the nucleus is converted into a proton, and an electron (beta particle) and an antineutrino are emitted. The process can be represented as follows:

Pb-211 → Bi-211 + e- + ν

In this equation, Pb-211 represents the parent nuclide, Bi-211 is the daughter nuclide, e- is the beta particle (electron) emitted during the decay, and ν is an antineutrino.

what is beta particle?

A beta particle, also known as a beta particle or beta radiation, is a high-energy, high-speed electron or positron that is emitted from the nucleus of an atom during radioactive decay.

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There have been no new nuclear reactors ordered by US utility companies in the US since 1976.The correct answer is option A.

This is a significant fact, considering that nuclear energy was once seen as the solution to the world's energy problems due to its low carbon emissions and high energy density. However, the nuclear disaster at Three Mile Island in 1979 and the Chornobyl disaster in 1986 changed the perception of nuclear power, making it less popular among the public.

Moreover, the cost of building and maintaining nuclear power plants is incredibly high, and the risk of accidents is always present. These factors, combined with the increasing availability and decreasing cost of renewable energy sources, have led many utility companies to focus on renewable energy instead of nuclear power.

However, in recent years, there has been renewed interest in nuclear energy as a potential solution to climate change. Many new nuclear reactor designs have been proposed that claim be safer and more efficient than traditional designs. Still, the high cost of building nuclear power plants remains a significant barrier to widespread adoption. Therefore, it is uncertain whether nuclear power will play a significant role in meeting future energy demands or not. The correct answer is option A.

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The area of the United States that would be most sensitive to acid precipitation is c. New England.

This is because the region has a higher susceptibility to acid rain due to its proximity to major industrial and urban areas that emit high levels of pollutants, as well as its naturally acidic soil and water systems. The acidity of precipitation increases as plants and trees take it up, making the forests of this region particularly susceptible. Additionally, the region's lakes and streams are especially sensitive to acidification, which can damage aquatic life and water quality.  Acid precipitation is caused by industrial emissions and car exhaust, which are more concentrated in this region due to its high population density.

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Anticyclones are associated with high pressure and subsiding air, which leads to stable atmospheric conditions. This stability can lead to the accumulation of air pollutants, such as particulate matter and nitrogen oxides, within the urban area, resulting in a stronger urban heat island (UHI) effect.

In addition, the subsiding air in anticyclones can cause a reduction in wind speed, which can limit the mixing of air between urban and rural areas, further enhancing the UHI effect.

Finally, clear skies and sunshine associated with anticyclones can lead to more solar radiation being absorbed by urban surfaces, increasing their temperatures and contributing to the UHI effect.

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Hyperpolarization, or the undershoot phase, occurs after an action potential because some K+ channels remain open.
This allows more potassium ions to exit the cell, making the inside of the cell more negative than the resting potential, resulting in hyperpolarization.

It exists in the body as a particle physiologically. The electrolyte potassium(K+), a cation, is present throughout the body in both intracellular and extracellular liquids. It has a distinct charge. Over 90% of the body's potassium is found inside cells.  the undershoot phase, occurs after an action potential because some K+ channels remain open.
This allows more potassium ions to exit the cell, making the inside of the cell more negative than the resting potential, resulting in hyperpolarization.

Typically, your cells contain 98% of the potassium in your body. You have 80% of this in your muscle cells, while the remaining 20% is in your bones, liver, and red blood cells (6). When ingested, it functions as an electrolyte.  

This gap causes a massive convergence of sodium ions that are strongly charged to enter the cell, producing an activity potential. To maintain the resting film potential, chloride particles are periodically syphoned back over the cell surface.  

A neuron is a phone that transmits electrical motivations. It is sometimes referred to as a nerve cell or a neurone. The fundamental (auxiliary and utilitarian) components of our sensory system are neurons. Axons, dendrites, and the phone body (also known as the soma or cyton) make up each neuron. Nerve fibres include dendrites and axons.

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To prevent the atmospheric carbon dioxide levels from continuing to increase, it is necessary to slash emissions to:  Option D. 70% of their 1990 levels.

In order to slow down the increase in atmospheric carbon dioxide levels, emissions must be reduced. The goal is to reach net-zero emissions, which means that any remaining emissions are balanced out by actions such as planting trees or using carbon capture technology. The Paris Agreement, which was signed in 2015 by almost all countries in the world, aims to keep global temperature rise below 2°C above pre-industrial levels and pursue efforts to limit the increase to 1.5°C. To achieve this, countries have committed to reducing their greenhouse gas emissions, with a goal of reducing emissions to 70% of their 1990 levels by 2030. Hence, The correct answer is d. 70% of their 1990 levels.

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The coldest phase of gas clouds is the molecular hydrogen phase, followed by the atomic hydrogen phase.

The warmest phase is the ionic hydrogen phase, which has the highest temperature due to the presence of charged particles. In terms of gas cloud phases consisting of hydrogen, you can rank them from coldest to warmest as follows:

1. Molecular hydrogen phase
2. Atomic hydrogen phase
3. Ionic hydrogen phase

Molecular hydrogen clouds are the coldest due to the presence of H2 molecules. Atomic hydrogen clouds are warmer with individual H atoms, and ionic hydrogen clouds are the warmest as they contain ionized H+ ions.

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Hydrogen gas cloud phases can be ranked from coldest to warmest as follows: molecular hydrogen, atomic hydrogen, and ionic hydrogen.

1. Molecular hydrogen phase: In this phase, hydrogen gas is in the form of H2 molecules. It is the coldest phase due to the low temperatures needed to maintain these stable molecules. Molecular hydrogen gas clouds are typically found in the interstellar medium and can have temperatures as low as 10-20 Kelvin.

2. Atomic hydrogen phase: In the atomic hydrogen phase, hydrogen gas exists as individual H atoms. The temperatures in this phase are higher than in the molecular phase but still relatively cool, ranging from about 100 to 1,000 Kelvin.

This phase is commonly found in the outer regions of galaxies where it forms a neutral hydrogen layer known as the "atomic hydrogen envelope."

3. Ionic hydrogen phase: This is the warmest phase, in which hydrogen gas is ionized, meaning the electrons are stripped from the hydrogen atoms, forming a plasma.

Temperatures in this phase can reach over 10,000 Kelvin. The ionic phase is prevalent in areas with high energy radiation, such as in the vicinity of young, hot stars or supernova remnants.

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The ion crucial to skeletal muscle fiber contraction is C) Ca2+ (calcium ions). Calcium ions play a key role in initiating the sliding filament mechanism, which leads to muscle contraction in skeletal muscle fibers.

The distance between an atom's nucleus and its last electron in its outermost shell is known as the ionic radius. An atom's ionic radius falls when it loses an electron (becomes a cation), but it increases when it gets an electron (becomes an anion).

As we well know, chemical synapsis is the form of synapsis that causes muscular contractions; therefore, when calcium enters, a neurotransmitter is released that stimulates the neighbouring cell, and sodium enters.

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The mixture is uniform throughout: A mixture of ethanol and water is a homogeneous mixture. The components in the mixture are immiscible. The mixture is colorless:

A homogenous mixture is a mixture in which the individual components are evenly distributed throughout the mixture, usually resulting in a uniform composition. This is in contrast to a heterogenous mixture, in which the individual components are clearly visible and the composition is not uniform. Examples of homogenous mixtures include air, saline solution, and vinegar.

Ethanol has a variety of uses in different industries. It is a common fuel for powering engines, either used on its own or as part of a blend with gasoline. It is also used as a solvent in the production of many products, such as paints, varnishes, antifreeze, and inks. Some liquid medications also contain ethanol because of its ability to dissolve certain active ingredients. Ethanol can also be used as a fuel source in the production of electricity via a process called fermentation. Finally, ethanol is used as an alternative fuel source that is commercially produced from biomass.

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The statements that support the conclusion that a mixture of ethanol and water is a solution are :- (i) The mixture is uniform throughout.; (ii) The components do not separate upon sitting over time. ;(iii) The mixture is colorless.

Based on your question, the statements that support the conclusion that a mixture of ethanol and water is a solution are:
- The mixture is uniform throughout.
- The components do not separate upon sitting over time.
- The mixture is colorless.

A mixture in chemistry is a substance made up of two or more unrelated chemical components. A mixture is a physical combination of two or more distinct substances that can take the form of solutions, suspensions, or colloids.

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The molarity of the solution is 0.20 M.

When 5 gram of table salt (NaCl) are dissolved in 500 mL of water, the molarity of the solution can be calculated. Since NaCl has a molar mass of 58.44 g/mol, the solution contains the following number of moles of NaCl:

The first step is to convert the given mass of CO2 to:

1 mole CO2 = 44.01 g

44 g CO2 = (44 g) / (44.01 g/mol) = 0.999 moles CO2

Next, we need to find the volume of the solution in liters:

5000 mL = 5.0 L

Finally, we can use the formula for molarity:

Molarity = moles of solute / liters of solution

Molarity = 0.999 moles CO2 / 5.0 L = 0.20 M

Therefore, the molarity of the solution is 0.20 M.

Molarity, often known as moles per liter of solution (mol/L or M), is a unit of measurement for the concentration of a solute in a solution.

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we need to use the Beer-Lambert law, which states that the change in absorbance is proportional to the concentration of the absorbing species and the path length of the sample.

The equation for the Beer-Lambert law is: A = εcl.
where A is the absorbance, ε is the molar absorptivity (a constant for a given absorbing species), c is the concentration, and l is the path length. We can rearrange this equation to solve for the concentration: c = A/(εl).

In this case, we are looking for the change in concentration of NADPH (c), given the change in absolute absorbance per second (A) from the DHFR functional assay analysis. We don't have the value of ε or l, but we can assume that they are constant throughout the experiment.

So, we can plug in the values we do have and solve for c: c = A/(εl) = 0.0035/(εl), We are not given the values of ε or l, but we don't need them to answer the question. We are looking for the change in concentration (Δc) of NADPH, so we can rewrite the equation as: Δc = ΔA/(εl), where ΔA is the change in absorbance per second. Plugging in the values we have: Δc = 0.0035/(εl).

We don't know the value of ε or l, but we can use the answer choices to eliminate some possibilities. We know that the change in concentration will be in units of micromoles per milliliter per minute (umol/ml/min). The only answer choice that has the correct units is: Δc = 0.000034 umol/ml/min.

Therefore, the change in concentration of NADPH is 0.000034 umol/ml/min if the change in absolute absorbance per second from the DHFR functional assay analysis was 0.0035.

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10.0 moles of [tex]H_2O[/tex] would be produced if 10.0 mol of iron hydroxide reacts completely

To answer this question, we need to know the balanced chemical equation for the reaction in which iron hydroxide[tex](Fe(OH)_2)[/tex] is converted to water (H2O):

[tex]Fe(OH)_2[/tex] → [tex]FeO + H_2O[/tex]

From the equation, we can see that for every molecule of iron hydroxide that reacts, one molecule of water is produced.

Therefore, the number of moles of water produced will be equal to the number of moles of iron hydroxide used.

If 10.0 mol of iron hydroxide reacts completely, then 10.0 mol of water will be produced.

Therefore, the answer is 10.0 moles of Water.

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The approximately 239.5 mL of the 95% alcohol mixture to mix with the 325 mL of 15% alcohol mixture to obtain a 70% alcohol solution.

To obtain a 70% alcohol solution, we need to calculate the amount of 95% alcohol mixture required to mix with the 325 mL of 15% alcohol mixture. Let's assume x mL of the 95% alcohol mixture is required to obtain the desired solution.

The amount of alcohol present in the 325 mL of 15% alcohol mixture is:

Alcohol in 325 mL of 15% alcohol mixture = 325 mL × 15% = 48.75 mL

To obtain a 70% alcohol solution, the amount of alcohol required in the final solution will be:

Amount of alcohol required = 70% × (325 mL + x)

We can set up an equation by equating the amount of alcohol in the initial mixture and the amount of alcohol required in the final solution:

48.75 mL + 0.95x mL = 0.7 (325 mL + x mL)

Solving this equation, we get:

0.95x = 227.5

x ≈ 239.5 mL

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The mass of product when 1.201 g of charcoal reacts with 6.414 g of powdered sulfur is 7.60 g.

To find the mass of product, we need to first calculate the limiting reactant. We do this by finding the number of moles of each reactant using their respective molar masses.

Molar mass of charcoal (C): 12.01 g/mol
Molar mass of sulfur (S): 32.06 g/mol

Number of moles of charcoal = 1.201 g / 12.01 g/mol = 0.0999 mol
Number of moles of sulfur = 6.414 g / 32.06 g/mol = 0.2002 mol

According to the balanced chemical equation, the reaction requires 1 mole of charcoal and 2 moles of sulfur to produce 1 mole of CS₂. Since there are not enough moles of charcoal to react with all the sulfur, charcoal is the limiting reactant.

The number of moles of CS₂ produced is equal to the number of moles of charcoal used (0.0999 mol). To find the mass of CS₂ produced, we use its molar mass:

Molar mass of CS₂: 76.14 g/mol

Mass of CS₂ produced = number of moles of CS₂ x molar mass of CS₂
Mass of CS₂ produced = 0.0999 mol x 76.14 g/mol = 7.60 g

Therefore, the mass of CS₂ produced is 7.60 g.

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The correct answer is (D) Hydrogen gas.

When oxides of active metals react with an acid, they form a salt and hydrogen gas. This reaction is also known as an acid-metal reaction.

The most active metals in the activity series are lithium, sodium, rubidium, potassium, cesium, calcium, strontium and barium. These elements belong to groups IA and IIA of the periodic table.

The hydrogen gas is produced because the acid donates hydrogen ions to the metal oxide, which then reacts with the metal to produce hydrogen gas. The salt is formed when the metal cation and the anion from the acid combine.

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Gas chlorine is a chemical compound used as a disinfectant for water treatment. It is commonly used in water treatment plants because of its ability to effectively kill harmful bacteria and viruses. Gas chlorine is considered 100 percent available chlorine, as it contains a high concentration of chlorine gas.

When added to water, the gas dissolves and forms hypochlorous acid, which is a powerful disinfectant. This acid is effective in killing bacteria, viruses, and other harmful microorganisms in water. Chlorine gas is also preferred because it is easy to handle, store, and transport.

It is also cost-effective, making it a popular choice for water treatment. It is important to handle chlorine gas with care, as it is toxic and can cause health hazards if not used properly.  Gas chlorine is a highly effective disinfectant for water treatment and is considered to be 100 percent available chlorine.

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Answer:

5.64 of copper

Explanation:

Given: 564 grams of copper

To find: in copper

Solution: If 1 grams Copper = 0.01 mole,

Then, 564 grams = multiply 564 and 0.01 mole

564 × 0.01 = 5.64

Therefore, there are 5.64 of copper in 564 grams

Hope this helps! =D

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