a scientist has 500 ml of a 2.1 M stock solution. she dilutes the solutioon, and the volume of the solution after the dilution is 3.25 L. what is the molarity of the diluted substance

Answer:

Increasing substrate concentration also increases the rate of reaction to a certain point. Once all of the enzymes have bound, any substrate increase will have no effect on the rate of reaction, as the available enzymes will be saturated and working at their maximum rate.

Answer:

A mixture of an element and a compound made of elements are two different types of combinations of matter.

An element is a substance that cannot be broken down into simpler substances by chemical means. Atoms are the smallest units of elements that still retain their properties. For example, gold is an element with the symbol Au, and its atoms cannot be broken down into simpler substances without losing their properties.

A compound, on the other hand, is a substance made up of two or more different elements chemically combined in a fixed ratio. For example, water is a compound made up of two hydrogen atoms and one oxygen atom, with the chemical formula H2O.

A mixture of an element and a compound is a combination of two or more substances that are physically mixed together, but not chemically combined. The substances in the mixture retain their individual properties and can be separated by physical means, such as filtering or evaporation. For example, a mixture of salt (a compound) and iron filings (an element) can be physically separated by using a magnet to attract the iron filings, leaving the salt behind.

In summary, the difference between a mixture of an element and a compound made of elements is that the former is a physical combination of two or more substances that retain their individual properties, while the latter is a chemical combination of two or more elements in a fixed ratio that results in a new substance with its own distinct properties.

Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Answer: Yes, magnesium will replace hydrogen because magnesium is higher on the activity  series list.

Explanation:

A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.  

A general single displacement reaction can be represented as :

\(X+YZ\rightarrow XZ+Y\)

\(Mg+2HCl\rightarrow MgCl_2+H_2\)

When magnesium is added to hydrochloric acid, magnesium being more reactive than hydrogen displaces hydrogen atom its salt solution and lead to formation of magnesium chloride and hydrogen gas.

The anode-cathode combinations that would not produce a voltaic cell with a high voltage are Au, H and Li, Fe.

The combination of Au (gold) and H (hydrogen) would not produce a high voltage voltaic cell. This is because hydrogen has a relatively high standard reduction potential, while gold has a low standard reduction potential. The standard reduction potential is a measure of a species' ability to gain electrons and be reduced. In this case, hydrogen would be preferentially reduced at the cathode, while gold would not be easily oxidized at the anode, resulting in a low voltage voltaic cell.

Similarly, the combination of Li (lithium) and Fe (iron) would not produce a high voltage voltaic cell. Lithium has a very low standard reduction potential, indicating its strong tendency to be oxidized, while iron has a higher standard reduction potential. As a result, lithium would be preferentially oxidized at the anode, while iron would not be effectively reduced at the cathode, leading to a low voltage voltaic cell.

The voltage produced by a voltaic cell is determined by the difference in standard reduction potentials of the anode and cathode. The greater the difference, the higher the voltage. In the cases of Au, H and Li, Fe combinations, the standard reduction potentials of the anode and cathode are not significantly different, leading to a low voltage.

In the case of Au and H, hydrogen has a positive standard reduction potential, indicating its tendency to be reduced and act as the cathode. However, gold has a relatively low standard reduction potential, suggesting it is not easily oxidized at the anode. As a result, the voltage produced by this combination would be low.

For Li and Fe, lithium has a highly negative standard reduction potential, making it a strong reducing agent and likely to be oxidized at the anode. On the other hand, iron has a higher standard reduction potential, but the difference is not significant enough to produce a high voltage. Therefore, the resulting voltaic cell would have a low voltage.

In summary, the anode-cathode combinations of Au, H and Li, Fe would not generate a high voltage in a voltaic cell due to the relatively small difference in their standard reduction potentials.

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The chemist should use 30 liters of the 20% solution, 20 liters of the 30% solution, and 40 liters of the 60% solution to obtain a mixture of 90 liters containing 40% acid.

Let's denote the number of liters of the 20% solution as x, the number of liters of the 30% solution as y, and the number of liters of the 60% solution as z.

According to the problem, we have the following information:

The total volume of the mixture is 90 liters: x + y + z = 90.

The desired percentage of acid solution in the mixture is 40%: (0.20x + 0.30y + 0.60z) / 90 = 0.40.

The chemist wants to use 2 times as much of the 60% solution as the 30% solution: z = 2y.

Now, we can solve these equations simultaneously to find the values of x, y, and z.

From equation 3, we have z = 2y.

Substituting this into equation 1, we get:

x + y + 2y = 90

x + 3y = 90 (equation 4)

From equation 2, we have:

(0.20x + 0.30y + 0.60z) / 90 = 0.40

Multiplying both sides by 90, we get:

0.20x + 0.30y + 0.60z = 36

0.20x + 0.30y + 0.60(2y) = 36 (since z = 2y)

0.20x + 0.30y + 1.20y = 36

0.20x + 1.50y = 36 (equation 5)

Now, we can solve equations 4 and 5 simultaneously to find the values of x and y.

Multiplying equation 4 by 0.20, we get:

0.20(x + 3y) = 0.20(90)

0.20x + 0.60y = 18

Subtracting this from equation 5, we eliminate x and solve for y:

0.20x + 1.50y - (0.20x + 0.60y) = 36 - 18

0.90y = 18

y = 18 / 0.90

y = 20

Substituting this value of y back into equation 4, we find:

x + 3y = 90

x + 3(20) = 90

x + 60 = 90

x = 90 - 60

x = 30

Since z = 2y, we have:

z = 2(20)

z = 40

Therefore, the chemist should use 30 liters of the 20% solution, 20 liters of the 30% solution, and 40 liters of the 60% solution to obtain a mixture of 90 liters containing 40% acid.

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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

The mass of zinc that reacted is 0.480 g.

To determine the mass of zinc that reacted, we need to use the ideal gas law to calculate the number of moles of hydrogen gas produced in the reaction. We can then use the stoichiometry of the balanced chemical equation to find the number of moles of zinc that reacted, and convert that to grams using the molar mass of zinc.

The balanced chemical equation for the reaction of zinc with hydrochloric acid is:

Zn(s) + 2HCl(aq) → \(ZnCl_2(aq) + H_2(g)\)

From the equation, we can see that one mole of zinc reacts with two moles of hydrochloric acid to produce one mole of hydrogen gas.

First, we need to calculate the number of moles of hydrogen gas that was produced. We can use the ideal gas law to do this:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

We need to convert the pressure and volume to units that are consistent with the gas constant R, which has units of L·atm/mol·K. The given pressure of 411 Torr is equivalent to 0.541 atm, and the volume of the container is 660 mL, or 0.66 L. The temperature is given as 25.0°C, or 298.2 K.

Plugging in the values, we get:

(0.541 atm) (0.66 L) = n (0.0821 L·atm/mol·K) (298.2 K)

Solving for n, we get:

n = 0.0147 mol \(H_2\)

Since the stoichiometry of the balanced chemical equation tells us that one mole of zinc reacts with one-half mole of hydrogen gas, the number of moles of zinc that reacted is half of the number of moles of hydrogen gas:

n(Zn) = 0.5 × n(\(H_2\)) = 0.00735 mol Zn

Finally, we can convert the moles of zinc to grams using the molar mass of zinc, which is 65.38 g/mol:

m(Zn) = n(Zn) × M(Zn) = 0.00735 mol × 65.38 g/mol = 0.480 g Zn

Therefore, the mass of zinc that reacted is 0.480 g.

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Answer:

5.36 moles

Explanation:

From the given chemical equation, we see that one mole of nitrogen gas reacts with 3 moles of hydrogen gas in terms of mass.

Molar mass of hydrogen gas ; H2 = 2.016 g/mol

Molar mass of nitrogen gas; N2 = 28.01 g/mol

Thus;

28.01 grams of nitrogen gas requires 3 moles of hydrogen gas

Thus;

28.01 grams of nitrogen gas requires 3 moles of hydrogen gas

Therefore, 50 g of nitrogen gas will require; (50 × 3)/28.01 = 5.36 moles

Answer: s sub level ↔ first energy level

s and p sub levels ↔ second energy level

s, p, and d sub levels ↔ third energy level

Explanation:

As we know, s sub level is nearest to the nucleus and lies in 1st principal shell, while if we see s and p sub levels are lies in 2nd subshell and s,p and d sub levels are lies in 3rd principal shell.

Answer:

s= 0.5 at^2

0.5 x 9.81 x 3^2 = 44m

Explanation:

OB.

44 meters

The type of chemical reaction that is necessary for electrochemical processes is redox.

A chemical reaction refers to the process where a chemical substance is transformed into a different substance through a chemical change. In other words, the initial substance is transformed into a different substance that has different chemical properties.

A redox reaction is a type of chemical reaction that occurs when a substance loses or gains electrons. Redox reactions play an important role in electrochemical processes, such as batteries and corrosion processes

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Answer: 0.000304 is the answer

Answer:

30400

Explanation:

I just think it's that i could be wrong

Answer: I think the answer is 3.) Krypton or Argon.

Explanation:

Acceleration of the car is the force divided by its mass. The acceleration of the car with 2500 kg  with a force of 175000 N is 70 m/s².

Acceleration is a physical quantity measuring the rate of change in velocity. It is a vector quantity having both magnitude and acceleration. Acceleration has the unit of m/s².

According to Newton's second law of motion, the force acting on a body is the product of its mass and acceleration.

F = ma

Given that, mass of the car = 2500 kg

force applied = 175000 N

acceleration = force/mass

a = 175000 N/2500 kg = 70m/s²

Therefore, the acceleration of the car is 70 m/s².

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We can confirm that malachite and pyrite are similar in that they are both carbonate minerals, they differ however in chemical composition and characteristics.

Pyrite is a form of iron sulfide. This mineral has come to be known as the fool's gold, for its striking resemblance to gold. Malachite, on the other hand, has been known to closely resemble emeralds and is often used as a gemstone. They are both carbonate minerals, but malachite is copper-based, giving it a different chemical composition and properties.

Therefore, we can confirm that malachite and pyrite are similar in that they are both carbonate minerals, they differ however in chemical composition and characteristics.

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The activation barrier can be calculated using the Arrhenius equation, which relates the rate constant of a reaction to the activation energy (Ea), temperature (T), and the frequency factor (A).

The frequency factor (A) represents the number of collisions between reactant molecules per unit time, and has units of s^-1. In other words, it is a measure of how often the reactants come into contact and have the potential to react. The activation barrier (Ea) is the minimum energy required for the reaction to occur, and represents the energy needed to break bonds and form new ones. It has units of energy, such as joules or kilojoules per mole.

The Arrhenius equation is a mathematical relationship between the rate of a reaction and the energy required for that reaction to occur. It takes into account the effect of temperature on reaction rate, and includes two key parameters: the activation energy (Ea) and the frequency factor (A). The activation energy is the minimum energy required for the reaction to occur, while the frequency factor is a measure of how often the reactants collide and have the potential to react. By knowing these two parameters, we can predict the rate of a reaction at different temperatures, and also determine the activation barrier needed for the reaction to occur.

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Yes the ANSWER is Correct-

On first half life the mass will be 10 gram

On second half life the mass will be 5 gram

On third half life the mass will be 2.5 gram

Revenue Budget: Projected revenue for CNH Radiology Centre in 2018:

Q1: $200,000 (2000 patients * $100 per patient)

Q2: $600,000 (6000 patients * $100 per patient)

Q3: $700,000 [($800,000 * 70%) + ($400,000 * 30%)]

Q4: $480,000 [($400,000 * 70%) + ($0 * 30%)]

Based on the forecasted patient numbers and the revenue per patient, the revenue budget for CNH Radiology Centre in 2018 is as follows. In Q1, with 2000 patients, the revenue is projected to be $200,000. In Q2, with 6000 patients, the revenue is expected to reach $600,000. For Q3, the revenue is calculated by considering 70% of the expected revenue from Q3 patients and 30% from Q4 patients. Thus, the total revenue for Q3 is projected to be $700,000. Similarly, for Q4, the revenue is calculated using 70% of the expected revenue from Q4 patients and 30% of the revenue from Q1 patients, as there are no forecasted patients for Q4. Therefore, the total revenue for Q4 is expected to be $480,000.

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Except for iron and copper, the occurrences of trace mineral deficiencies and toxicities are rare. Trace minerals are required by the body in small quantities for various physiological functions. Iron is essential for the formation of hemoglobin in red blood cells, while copper is required for the formation of various enzymes that play a role in energy metabolism, connective tissue formation, and neurotransmitter synthesis. The answer to the question is option D,

Deficiencies in these trace minerals can lead to anemia, fatigue, weakness, and impaired immune function. Toxicity, on the other hand, can occur when these minerals are consumed in excess amounts. Excessive iron intake can lead to liver damage, joint pain, and diabetes, while copper toxicity can cause gastrointestinal distress, liver damage, and neurological symptoms.
However, deficiencies and toxicities of other trace minerals such as iodine, selenium, copper, and chromium are relatively rare. Iodine deficiency can lead to hypothyroidism, goiter, and mental disorder, while selenium deficiency can cause muscle weakness, cardiomyopathy, and thyroid dysfunction. Copper deficiency can cause anemia, neutropenia, and bone abnormalities, while chromium deficiency can lead to impaired glucose metabolism and increased risk of diabetes.
In conclusion, while deficiencies and toxicities of trace minerals can occur, it is important to ensure adequate intake of all trace minerals through a balanced diet or supplements to prevent these conditions. It is also essential to avoid excessive intake of trace minerals to prevent toxicity. Option D.

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Answer: A solid form of matter in which there is long-range repeating order is called crystalline.

Explanation:

A solid is crystalline if it has long-range order. Once the positions of an atom and its neighbors are known at one point, the place of each atom is known precisely throughout the crystal.

Answer:

2. Components of a mixture can be separated by physical means

Explanation:

The Compound is defined as the substances that are chemically combined while mixtures are the substances in which two or more compounds are physically combined together.

The difference between compound and mixture from the given options is that mixture can be separated physically unlike compounds.

In a mixture, two or more compounds can be mixed in any proportion that can be separated by physical means. For example: salt from seawater (mixture) can be separated evaporation and nails from the mixture of sand and iron can be separated through magnetic separation.

Hence, the correct answer is "Components of a mixture can be separated by physical means".

Another approach to think about molecule orbitals is via the lens of molecular orbital theory. Unlike the valence bond's lone pair of electrons and localized bond.

The following are the postulates of the molecular orbital theory: Similar to how an atom's electrons are found in different atomic orbitals, a molecule's electrons are found in a variety of molecular orbitals. Atomic orbitals with appropriate symmetry and equivalent energy combine to generate molecular orbitals.

According to MO theory, molecular bonds are just nuclei trading electrons. contrary to the VB theory, which views the electrons as localized hybrid electron density orbitals. According to MO theory, the electrons are delocalized.

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Oxygen release the energy stored in nutrients to provide heat and energy functioning Outside respiratory entails known as external respiration.

The use of oxygen to release energy stored in nutrient molecules, along with, glucose. Sound is produced via air being expelled from the lungs and passed over the larynx. Few organs may be on more than others, such as the brain, or muscular tissues if you are exercising, consequently they get hotter. This needs to be unfold around the body and this is completed by using the blood, which heats a few organs and cools others.

Consumption in extra than necessary amounts is stored as glycogen within the liver and muscle cells, and in fat cells. excess adipose storage can result in weight problems and severe fitness problems. ATP is the energy foreign money of the cell and is received from the metabolic pathways.

There is an change of gases among the lungs and the blood. that is known as external respiration. The blood transports the gases to and from the tissue cells. The trade of gases between the blood and tissue cells is inner respiratory.

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The relationship between the number of atoms attached to the central atom and the resulting molecular shape can be described by VSEPR theory.

The valence-shell electron-pair repulsion theory (VSEPR) suggests that the geometric arrangement of atoms around a central atom in a molecule is determined by the electrostatic repulsion between the valence electron pairs in the atoms forming the molecule.

Valence Shell Electron Pair Repulsion (VSEPR) theory is a model used to predict the three-dimensional geometry of a molecule, which is essential for understanding the molecule's properties and reaction mechanisms.

According to this theory, the arrangement of atoms around a central atom is determined by minimizing the repulsion between the pairs of valence electrons. In other words, the geometry of a molecule is determined by the arrangement of electron pairs surrounding the central atom.

Therefore, the number of atoms connected to the central atom and the position of these atoms (i.e., lone pair or bonding pair) determine the geometry of the molecule.

For example, the linear molecule of carbon dioxide has two oxygen atoms attached to the central carbon atom, resulting in a linear arrangement of atoms. The tetrahedral arrangement of four atoms is produced by a central carbon atom bonded to four hydrogen atoms in methane.

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Takealot excels at providing convenience, extensive product selection, competitive pricing, and a seamless online shopping experience as its value proposition for consumers.

Convenience is a key aspect of Takealot's value proposition. As an online retailer, Takealot offers the convenience of 24/7 shopping from the comfort of one's own home.

Customers can browse a wide range of products, place orders, and have them delivered directly to their doorstep.

Takealot also offers an extensive product selection, spanning various categories such as electronics, fashion, home goods, and more.

This breadth of choices allows consumers to find and compare different products all in one place, saving them time and effort compared to traditional retailers with limited inventory.

Competitive pricing is another area where Takealot excels. By operating online, the company has lower overhead costs compared to brick-and-mortar retailers, enabling them to offer competitive prices and discounts to their customers.

The seamless online shopping experience provided by Takealot includes user-friendly interfaces, secure payment options, and efficient delivery services. This enhances customer satisfaction and convenience.

In contrast, traditional non-online retailers typically have limited operating hours, smaller product selections, and may not offer the same level of convenience and competitive pricing.

They often require customers to physically visit their stores, which can be time-consuming and may not provide the same level of ease and accessibility as online platforms like Takealot.

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