Complete and balance the following redox reaction in basic solution. zn(s)=zn(oh)42-(aq) h2(g)

Answer:

\(\boxed {\boxed {\sf 232.9 \textdegree C}}\)

Explanation:

This question asks us to find the temperature change given a volume change. We will use Charles's Law, which states the volume of a gas is directly proportional to the temperature. The formula is:

\(\frac {V_1}{T_1}= \frac{V_2}{T_2}\)

The volume of the gas starts at 250 milliliters and the temperature is 137 °C.

\(\frac{250 \ mL}{137 \textdegree C}= \frac{V_2}{T_2}\)

The volume of the gas is increased to 425 milliliters, but the temperature is unknown.

\(\frac{250 \ mL}{137 \textdegree C}= \frac{425 \ mL}{T_2}\)

We are solving for the new temperature, so we must isolate the variable T₂. First, cross multiply. Multiply the first numerator and second denominator, then multiply the first denominator and second numerator.

\(250 \ mL * T_2 = 137 \textdegree C * 425 \ mL\)

Now the variable is being multiplied by 250 milliliters. The inverse of multiplication is division. Divide both sides of the equation by 250 mL.

\(\frac{250 \ mL * T_2}{250 \ mL}=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)

\(T_2=\frac{ 137 \textdegree C * 425 \ mL}{250 \ mL}\)

The units of milliliters (mL) cancel.

\(T_2=\frac{ 137 \textdegree C * 425 }{250 }\)

\(T_2= \frac{58225}{250} \textdegree C\)

\(T_2=232.9 \textdegree C\)

The temperature changes to 232.9 degrees Celsius.

There are 12.044 × 10^23 oxygen molecule present in 2mole of oxygen molecule.

According to the context, the word may as well as may not encompass ions that meet this requirement. A molecule is a collection of two as well as more atoms linked together by the attractive forces described as chemical bonds.

The lowest unit into which a substance could be divided while still being the same substance would be a molecule. It is composed of two as well as more atoms which are chemically bonded to one another.

1 mole of oxygen = 1 O2 molecule

2 mole = 2 O2 molecule = 2 × 6.022 × 10^23 molecule = 12.044 × 10^23 molecule

Thus, 2 mole of oxygen will have 12.044 × 10^23 molecule

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Answer: b=3-2c-a

Explanation:

a+b+2c=3

a-a+b+2c=3-a

b+2c=3-a

b+2c-2c=3-2c-a

b=3-2c-a

Answer:

To find the pressure of the dry hydrogen gas alone, we need to subtract the pressure exerted by the water vapor from the total pressure of the mixture.

First, we need to convert the vapor pressure of water from mmHg to kPa:

11.9 mmHg x (1 kPa / 7.5006 mmHg) = 0.0159 kPa

Next, we need to subtract this value from the total pressure of the mixture:

113.0 kPa - 0.0159 kPa = 112.9841 kPa

Therefore, the pressure exerted by the dry hydrogen gas alone is 112.9841 kPa.

Explanation:

Answer:

These defensive driving skills can help you avoid the dangers caused by other ... being aware of the cars around you, checking your mirrors — the list goes on. ... It's not just teen drivers who are at fault: People who have been driving for a while ... car and a slow-moving truck in the same lane, it's a pretty sure bet the driver ...

Explanation:

Answer:

Recycling scrap copper is more sustainable than extracting copper from copper ores due to the following reasons:

Reduces energy consumption: Recycling scrap copper requires less energy compared to mining, extracting, and processing copper ores. This results in a reduction in greenhouse gas emissions and a decrease in energy consumption.

Conservation of natural resources: Recycling scrap copper conserves natural resources because it reduces the need for mining copper ores. Mining copper ores often leads to the destruction of ecosystems, soil erosion, and the emission of harmful pollutants into the environment.

Reduction in landfill waste: Recycling scrap copper helps to reduce the amount of waste in landfills. Copper is a valuable resource, and recycling it ensures that it is reused instead of ending up in landfills.

Cost-effective: Recycling scrap copper is often cheaper than extracting copper from copper ores. This is because recycling eliminates the cost of mining, extracting, and processing copper ores.

Preservation of water resources: Extracting copper from copper ores requires large amounts of water, which can lead to water shortages in some regions. Recycling scrap copper requires less water, thus helping to preserve water resources.

Overall, recycling scrap copper is more sustainable than extracting copper from copper ores because it reduces energy consumption, conserves natural resources, reduces landfill waste, is cost-effective, and helps to preserve water resources.

Explanation:

The following compound could have the molecular formula C8H18: 2,3-dimethylpentane.

The molecular formula is a chemical formula that reflects the chemical composition of a molecule. It shows the exact number and types of atoms in a single molecule of a substance. It does not reflect the arrangement of the atoms in the molecule.

In organic chemistry, the molecular formula is essential because it can help identify a compound's structural isomers. A structural isomer is a compound that has the same molecular formula as another compound but has a different arrangement of atoms.

3-methylhexane, 2-methylheptane, pentane, and hexane are all possible isomers of C8H18. The molecular formula for 2,3-dimethylpentane is C8H18.

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Answer:

It falls in Liquid and Solid.

Explanation:

By comparing the voltage values of the half-cell reaction of Sn with various metals, we can determine the relative reactivity of these metals. Here are the interactions listed along with their respective voltages:

- Sn + Ag: -1.018V

- Sn + Cu: -0.603V

- Sn + Fe: -0.082V

- Sn + unknown metal: 0.253V

Based on the given information, we can observe the following:

1. Sn + Ag: -1.018V

The voltage of -1.018V indicates that the reaction of Sn with Ag is spontaneous, with Sn acting as the reducing agent and Ag as the oxidizing agent. This suggests that Sn has a higher reactivity than Ag.

2. Sn + Cu: -0.603V

The voltage of -0.603V suggests that the reaction of Sn with Cu is also spontaneous, with Sn acting as the reducing agent and Cu as the oxidizing agent. This implies that Sn has a higher reactivity than Cu.

3. Sn + Fe: -0.082V

  The voltage of -0.082V indicates that the reaction of Sn with Fe is spontaneous, with Sn acting as the reducing agent and Fe as the oxidizing agent. This suggests that Sn has a higher reactivity than Fe.

4. Sn + unknown metal: 0.253V

  The voltage of 0.253V suggests that the reaction of Sn with the unknown metal is not spontaneous. The unknown metal is more reactive than Sn since it acts as the reducing agent, while Sn acts as the oxidizing agent.

In summary, Sn is more reactive than Ag, Cu, and Fe based on their respective voltage values. However, the unknown metal is more reactive than Sn.

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It is not possible to have a non-zero pressure without any temperature, as pressure is a measure of the force per unit area exerted by gas molecules colliding with the walls of a container, and temperature is a measure of the average kinetic energy of those gas molecules.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance, such as atoms, molecules, or ions. It is a scalar quantity that quantifies the level of thermal energy or heat present in a system. Temperature determines the direction of heat flow, with heat generally flowing from hotter objects to cooler objects until thermal equilibrium is reached.

In general, pressure and temperature are related in the ideal gas law, which states that for an ideal gas, the pressure (P), volume (V), and temperature (T) are related by the equation PV = nRT, where n is the number of moles of gas and R is the ideal gas constant. According to this equation, pressure and temperature are directly proportional to each other, meaning that an increase in temperature typically results in an increase in pressure, assuming other variables such as volume and amount of gas remain constant.

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The matching is like :- (A) Atomic mass - amu (atomic mass units) (B) Molarity - mol/liter (C) Molar mass - g/mol (grams per mole)

The atomic mass (in amu) is used to convert between the mass of an element and the number of moles of that element, while the molar mass (in g/mol) is used to convert between the mass of a compound and the number of moles of that compound. Molarity (in mol/L) is used to express the concentration of a solution. In chemistry, the atomic mass of an element is the mass of a single atom of that element relative to the mass of a carbon-12 atom, which is defined as exactly 12 atomic mass units (amu). The atomic mass is typically given in units of amu, and it is used to convert between the mass of an element and the number of moles of that element. Molarity is a unit of concentration that is commonly used in chemistry. It is defined as the number of moles of solute per liter of solution. The unit for molarity is mol/L, which is often abbreviated as M. Molar mass is the mass of one mole of a substance. It is expressed in units of grams per mole (g/mol). The molar mass is used to convert between the mass of a compound and the number of moles of that compound. For example, if we know the atomic mass of an element (in amu), we can use it to calculate the molar mass of that element (in g/mol). Similarly, if we know the molarity of a solution (in mol/L) and the molar mass of the solute (in g/mol), we can calculate the mass of the solute in a given volume of the solution.

In summary, the atomic mass, molarity, and molar mass are all important concepts in chemistry that are expressed in different units. Understanding these units and how to use them is essential for many calculations in chemistry.

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The molarity of the NaCl in the solution is 0.0855 M.

To calculate the molarity of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters).

Concentration of NaCl solution = 5% (w/v)

The molar mass of NaCl (FW) = 58.44 g/mol

A 5% (w/v) solution means that 5 grams of NaCl is dissolved in 100 milliliters (mL) of solution.

First, let's convert the volume from milliliters to liters:

Volume of solution = 100 mL = 0.1 L

To find the amount of NaCl in moles, we can use the formula:

Amount (moles) = Mass (g) / Molar mass (g/mol)

Mass of NaCl = 5% of the volume of the solution

            = 5/100 * 0.1 L

            = 0.005 L

Amount of NaCl (moles) = 0.005 L * (5 g / 1000 g) / 58.44 g/mol

Now, we can calculate the molarity (M) using the formula:

Molarity (M) = Amount (moles) / Volume (L)

Molarity of the NaCl solution = (0.005 L * (5 g / 1000 g) / 58.44 g/mol) / 0.1 L

Therefore, the molarity of the NaCl solution is:

Molarity = 0.0855 M

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To produce 2,4-dimethylhexan-2-ol, the starting alkene required is 2,4-dimethylhex-2-ene. The reaction proceeds through an acid-catalyzed hydration process, resulting in the formation of 2,4-dimethylhexan-2-ol.

The synthesis of 2,4-dimethylhexan-2-ol involves the addition of water to an alkene, which is an example of an acid-catalyzed hydration reaction. In this case, the starting alkene is 2,4-dimethylhex-2-ene, which has a double bond between the second and third carbon atoms in the carbon chain.

The reaction is typically carried out in the presence of a catalyst, such as sulfuric acid (H2SO4). The sulfuric acid acts as a catalyst by providing protons (H+) to initiate the reaction. The protonation of the double bond in the alkene creates a carbocation intermediate.

Next, water (H2O) is added to the carbocation, resulting in the formation of an oxonium ion. The oxonium ion is then deprotonated, leading to the formation of the alcohol product, 2,4-dimethylhexan-2-ol. The presence of the two methyl groups in the product indicates the regioselectivity of the reaction, with the water molecule adding to the carbon atom that has fewer substituents.

Overall, the reaction of 2,4-dimethylhex-2-ene with H2O and an H2SO4 catalyst leads to the production of 2,4-dimethylhexan-2-ol through an acid-catalyzed hydration process.

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Precipitates are insoluble ionic solid products of a reaction, formed when certain cations and anions combine in an aqueous solution. The determining factors of the formation of a precipitate can vary.

Answer:

Explanation:

3.81 m. = 150 inches.

I can't find explanation. Hope this is my best!

Answer:

When one reactant is in excess, there will always be some left over. The other reactant becomes a limiting factor and controls how much of each product is produced. While using excess reactants can help to increase percentage yields, this is at the expense of atom economy.

Explanation:

The Combustion is the the limiting reactant.

What is combustion ?

The generation of heat and light in the form of flame together with a chemical reaction that often entails the presence of oxygen. When a substance interacts with oxygen, a chemical reaction known as combustion occurs that generates heat. Among them are ethane, wood, and propane. The word for these compounds is exhaust. The majority of the exhaust is produced by chemical processes involving fuel and oxygen.

What is reaction ?

In a chemical reaction, one or more chemicals change into one or more other substances. For instance, the reaction between iron and oxygen results in rust. Sodium acetate, carbon dioxide, and water are the end products of the reaction between vinegar and baking soda.

Therefore, the Combustion is the the limiting reactant.

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628.2897 mg of the 2,000 mg sample remain after 3.50 years of radioactive decay.

the sample remains after 3.50 years of radioactive decay can be calculate as follows:

the formula of half- life is

\(A(t) = A_0(\frac{1}{2} )^\frac{T}{t_\frac{1}{2} }\)

where, A₀ is the initial quantity,  A(t) is the amount remaining after a time (t), and t ₍₁₂₎ is the half-life of the decaying quantity.

Sample amount = 1.000 mg initially

After radioactive decay

\(A(t) = A_0(\frac{1}{2} )^\frac{T}{t_\frac{1}{2} }\)

\(A(t) = 1000(\frac{1}{2} )^\frac{3.5}{5.22 }\)

A(t) = 628.2897 mg

So after 3.5 years we are left with 628.2897 mg milligrams of the 1,000 mg sample.

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Answer:

bacteria

Explanation:

I hope this help

The wavelength of the light fired in the world’s most powerful laser is 37×10⁻¹⁰ nm.

A laser is a device that produces a coherent light beam through optically amplification.

The given data is

Energy = time × power

Energy = 25 ×  30

Energy = 750 J

Photons = 7.5 x 10²⁰

Then the formula is λE =hc

where E = energy,

           h = plank constant,

           c= speed,

           λ = wavelength

wavelength calculation is,

λ = hc / E

λ = 6.62×10⁺³⁴×7.5 x 10²⁰ ×750 J

λ = 37×10⁻¹⁰ nm

The wavelength of the laser is 37×10⁻¹⁰ nm.

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O2- Option B is correct

Explanations:

Calcium atom is a group 2 elements that gives out two electrons in order to form a stable configuration and a Ca2+ ion. These two electrons are transferred to an atom that required two electrons to complete its outer shell.

Since oxygen required 2 electron to attain its octet configuration, hence they can easily accepts the two electrons from calcium atoms to form CaO which is composed of Ca2+ and O2- ions in the ratio of one Ca2+ ion to one O2− ions.

To calculate the amount of alum required for a 45 mg/d (million gallons per day) water treatment plant, we need to convert the units from ppm (parts per million) to lbs (pounds).

Convert ppm to lbs per million gallons:

25 ppm Al₃+ x 1 lb Al₂(SO₄)₃ / 1000 ppm Al₃+ = 0.025 lbs Al₂(SO₄)₃ per million gallons

0.025 lbs Al₂(SO₄)₃ per million gallons x 45,000,000 gallons per day = 1,125 lbs Al₂(SO₄)₃ per day

Therefore, a 45 mg/d water treatment plant would require approximately 1,125 lbs of alum per day at an optimum dosage of 25 ppm Al₃+.

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\(1.3\times 10^{-18}\) Joule is the radiation’s energy.

Explanation:

                                 \(E=h\times \nu\)

                            Where:

                       E = Energy of electromagnetic radiation

                       h = Planck's constant=\(6.626\times 10^{-34} Js\)

                       \(\nu\) = frequency of the electromagnetic radiation

Given:

The frequency of the electromagnetic radiation =\(\nu = 2.0\times 10^{15} s^{-1}\)

To find:

The energy of the electromagnetic radiation

Solution:

The frequency of the electromagnetic radiation = \(\nu = 2.0\times 10^{15} s^{-1}\)

The energy of the radiation = E

\(E=h\times \nu\\E=6.626\times 10^{-34} Js\times 2.0\times 10^{15} s^{-1}\\=1.3\times 10^{-18} J\)

\(1.3\times 10^{-18}\) Joule is the radiation’s energy.

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If we wanted to understand the time since divergence of two different species, we would sequence variation in chromosomal markers.

Many different aspects of organismal variation have been studied using molecular markers, including questions about the relationship between species, the evolution of populations, the degree of genetic variation within a species, behavioral patterns, how patterns of gene expression can differ among populations that are closely related, and many other topics.

Some significant restrictions on molecular ecology to be aware of. First, developing markers can be costly and time-consuming. Second, although the fact that molecular ecology is not reliant on direct observation of behaviors can be advantageous, this advantage can frequently be a drawback. Scientists must infer the behavior that led to a particular molecular pattern since the activity is not directly witnessed.

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Molarity

Chemists primarily need the concentration of solutions to be expressed in a way that accounts for the number of particles that react according to a particular chemical equation. Since percentage measurements are based on either mass or volume, they are generally not useful for chemical reactions. A concentration unit based on moles is preferable. The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.

Note that the volume is in liters of solution and not liters of solvent. When a molarity is reported, the unit is the symbol M and is read as “molar”. For example a solution labeled as 1.5 M NH 3 is read as “1.5 molar ammonia solution”.

Sample Problem: Calculating Molarity

A solution is prepared by dissolving 42.23 g of NH 4 Cl into enough water to make 500.0 mL of solution. Calculate its molarity.

Step 1: List the known quantities and plan the problem.

& underline{text{Known}} &&underline{text{Unknown}} \& text{mass}=42.23 text{g} NH_4Cl && text{molarity}= ? text{ M}\& text{molar mass} NH_4Cl=53.50 text{g} / text{mol} \& text{volume solution}=500.0 text{mL}=0.5000 text{L}

The mass of the ammonium chloride is first converted to moles. Then the molarity is calculated by dividing by liters. Note the given volume has been converted to liters.

Step 2: Solve.

42.23 text{ g } NH_4Cl times frac{1 text{ mol } NH_4Cl}{53.50 text{ g } NH_4Cl} &= 0.7893 text{ mol } NH_4Cl\frac{0.7893 text{ mol } NH_4Cl}{0.5000 text{ L}} &= 1.579 text{ M}

Step 3: Think about your result.

The molarity is 1.579 M, meaning that a liter of the solution would contain 1.579 mol NH 4 Cl. Four significant figures are appropriate.

In a laboratory situation, a chemist must frequently prepare a given volume of solutions of a known molarity. The task is to calculate the mass of the solute that is necessary. The molarity equation can be rearranged to solve for moles, which can then be converted to grams. See sample problem 16.3.

Sample Problem:

A chemist needs to prepare 3.00 L of a 0.250 M solution of potassium permanganate (KMnO 4 ). What mass of KMnO 4 does she need to make the solution?

Step 1: List the known quantities and plan the problem.

Known

molarity = 0.250 M

volume = 3.00 L

molar mass KMnO 4 = 158.04 g/mol

Unknown

mass KMnO 4 = ? g

Moles of solute is calculated by multiplying molarity by liters. Then, moles is converted to grams.

Step 2: Solve.

text{mol KMnO}_4 = 0.250 text{ M KMnO}_4 times 3.00 text{ L} &= 0.750 text{ mol KMnO}_4\0.750 text{ mol KMnO}_4 times frac{158.04 text{ g KMnO}_4}{1 text{ mol KMnO}_4} &=119 text{ g KMnO}_4

Step 3: Think about your result.

When 119 g of potassium permanganate is dissolved into water to make 3.00 L of solution, the molarity is 0.250 M.

Taking into account the definition of molarity, the volume of solution that contains 3.12 moles of NaCl and the concentration is 6.67 M NaCl is 0.4678 L.

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by:

molarity= amount of moles÷ volume

Molarity is expressed in units moles/L.

In this case, you have:

Replacing in the definition of molarity:

6.67 M= 3.12 moles÷ volume

Solving:

6.67 M× volume= 3.12 moles

volume=3.12 moles ÷6.67 M

volume= 0.4678 L

Finally, the volume will be 0.4678 L.

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The assertion that equilibrium is true in option D When the products of a reaction are often more durable than the starting material, equilibrium favors the products.

The definition of equilibrium.

A static (like a body acted upon by energies whose result is zero) or fluid (like a chemical reaction reversible where the speeds in both sides are equal) condition of equilibrium between opposing sides or actions: a condition of emotional or intellectual equilibrium.

What does a body's balance mean?

When the body is in equilibrium, neither its internal energy nor its motion are affected by the passage of time. The forces are equalized if an item is in equilibrium.

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The supreme court decision is: Tinker v. Des Moines Independent Community School District (1969).

The landmark Supreme Court case of Tinker v. Des Moines Independent Community School District (1969) was monumental in its decision to protect freedom of expression. This case involved several Iowa high school students, who were suspended from school for wearing armbands as a form of protest against the Vietnam War. The students took their case to court, arguing that their right to free expression was violated by the school district. The court ultimately sided with the students, ruling that “students do not shed their constitutional rights to freedom of speech or expression at the schoolhouse gate”.

This ruling was the first time that the Supreme Court had addressed the issue of student expression in public schools. The ruling established the precedent that students are protected by the First Amendment in public schools, and that school administrators must have a valid reason to restrict student speech. This ruling was also important in protecting the rights of students to express their opinions in a peaceful manner. In addition, the case highlighted the importance of individual expression and the power of students to challenge the status quo.

Which of the following supreme court decisions allows public school students to wear t-shirts protesting a school board decision that eliminates funding for high school arts programs?

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