A truck weighs 7280 pounds. If the pressure exerted by its tires on the ground is 87. 5 pounds per square centimeter,what is the area of one tire that in contact with the road

The molality of the sucrose solution is 1.16 m

The molality of a solution is defined as the mole of solute per unit kilogram (Kg) of water. Mathematically, it can be expressed as:

Molality = mole / mass (Kg) of water

Mole = mass / molar mass

Mole of sucrose = 37.4 / 342.2

Mole of sucrose = 0.109 mole

Molality = mole / mass (Kg) of water

Molality of sucrose = 0.109 / 0.0942

Molality of sucrose = 1.16 m

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Answer:

Explanation:

Potential energy builds as the coaster is going up the loop-the-loop and converts to kinetic energy on the way down and out of the loop-the-loop. The potential energy of the coaster is at its lowest and the kinetic energy is at its highest as the coaster moves in the lowest point of the loop-the- loop.

Answer:

Question 4 is 291.0346

Explanation:

The descending chain condition states that, for all non-empty sets in a given set, there exists a minimal element. The ascending chain condition states that, for all non-empty sets in a given set, there exists a maximal element.

To show that if d satisfies the descending chain condition, it must satisfy the ascending chain condition, let's assume the opposite is true. That is, assume that d satisfies the descending chain condition, but not the ascending chain condition.

In this case, there would exist some non-empty sets in d, which do not have a maximal element. However, since d satisfies the descending chain condition, there must be a minimal element for each of these sets. This contradicts our assumption that d does not satisfy the ascending chain condition, as every set with a minimal element must have a maximal element as well. Thus, if d satisfies the descending chain condition, it must also satisfy the ascending chain condition.

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Answer:

9.90

Explanation:

Given [H+] = 1.25 x 10^-10 M, we can calculate the pH using the formula:

pH = -log10([H+])

pH = -log10(1.25 x 10^-10)

Using logarithmic properties:

pH = -log10(1.25) - log10(10^-10)

Since log10(10^-10) is equal to -10:

pH = -log10(1.25) - (-10)

pH = -log10(1.25) + 10

Now, evaluating the logarithm using a calculator:

pH = -0.0969 + 10

pH = 9.9031

Therefore, the pH of the solution with [H+] = 1.25 x 10^-10 M is approximately 9.9031. Rounding it to two decimal places, the pH is approximately 9.90.

Answer:

im an idiot but  i think its A

if im wrong im so sorry

Explanation:

Answer:

Carbon dioxide and silicone dioxide are both made with only non metals, magnesium oxide is formed with a metal and a non metal, Carbon dioxide has double bonds O=C=O, while silicone dioxide is made of single bonds.

Answer:

A. 1:1

Explanation:

Lithium 1s2 2s1

Chlorine 1s2 2s2 2p6 3s2 3p5

Lithium is a group 1 element. When it forms a compound, it loses it's one valence (outermost) electron.

Chlorine is a group 7 element. When it forms a compound, it gains one electron to achieve a stable electronic configuration.

Since Li loses one electron and Cl gains one electron. The formular of the compound formed would be;

LiCl

The correct option is;

A. 1:1

To prepare a buffer solution, we need to have a weak base and its conjugate acid in roughly equal amounts. In this case, the weak base is ammonia (\(NH_{3}\)), and its conjugate acid is ammonium (\(NH_{4}^{+}\)). 40.11 grams of dry \(NH_{4} Cl\) need to be added to 1.50 L of a 0.500 M solution of ammonia to prepare a buffer solution that has a pH of 8.79.

The Henderson-Hasselbalch equation for a buffer solution is:

pH = \(pKa + log([A^{-} ]/[HA])\)

where pKa is the acid dissociation constant of the weak acid (in this case, ammonium, \(NH_{4}^{+}\)), [\(A^{-}\)] is the concentration of the conjugate base (in this case, ammonia, \(NH_{3}\)), and [HA] is the concentration of the weak acid (in this case, ammonium, \(NH_{4}^{+}\)).

At the pH of 8.79, the pKa can be calculated as:

pKa = pKb + pKw - pH

= 9.24 + 14.00 - 8.79

= 14.45

Using the Henderson-Hasselbalch equation, we can rearrange it to solve for the ratio of [\(A^{-}\)]/[HA]:

[\(A^{-}\)]/[HA] = \(10^(pH - pKa)\)

[\(A^{-}\)]/[HA] = \(10^(8.79 - 14.45)\)= 1.12 x \(10^(-6)\)

We know that the total volume of the buffer solution will be 1.50 L, and the concentration of the weak base (ammonia, \(NH_{3}\)) is 0.500 M. This means that the concentration of the weak acid (ammonium, \(NH_{4}^{+}\)) must also be 0.500 M to have them in equal amounts. We can use the following equation to calculate the amount of \(NH_{4} Cl\) needed to make this solution:

moles of \(NH_{4} Cl\) = moles of \(NH_{4}^{+}\) = (0.500 M) (1.50 L) = 0.75 mol

The molar mass of \(NH_{4} Cl\) is 53.49 g/mol, so the mass of \(NH_{4} Cl\) needed is:

mass of \(NH_{4} Cl\) = (0.75 mol) (53.49 g/mol) = 40.11 g

Therefore, 40.11 grams of dry \(NH_{4} Cl\) need to be added to 1.50 L of a 0.500 M solution of ammonia to prepare a buffer solution that has a pH of 8.79.

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Answer:please see explanation for answers

Explanation:

Water conservation is an approach geared towards controlling how water is used. Because of the ever growing population, which weighs so much on water available to mankind,Over negligence and abuse of our water resources have been a great point of concern, that is why the need for the knowledge of water conservation is preached.

Now, some of the ways we can conserve water include

1. Putting off taps while lathering the hands with soap

2.use of irrigation system to water crops and plants

3.. while brushing, make sure to turn off the tap or faucet

4. use a shower rather than a bath

Answer:

The magnetic field of an atom, say H (one electron revolving around a proton) is composed of two separate contributions: an orbital magnetic moment and a spin magnetic moment. We get magnetic moments because of electromagnetic induction associated with each type of electron motion. The electron revolving around the proton with a certain angular momentum is related to the associated orbital magnetic moment (and, yes, we model it as a wire loop with current expressed in terms of the orbital velocity). This can be calculated using elementary mechanics. The spin magnetic moment is a little trickier because it is caused by the intrinsic spin of the electron which is a quantum phenomenon; therefore, this spin magnetic moment can only be calculated using quantum mechanics. In the end, we get a certain net magnetic moment associated with this motion of the electron in an atom. It is important to notice that this atom acts as a magnetic dipole (remember, as of yet, magnetic monopoles don't exist!).

If we take a bulk magnet like you might have on your fridge, it would be composed of atoms. Each atom operates as a magnetic dipole, but due to internal atomic structures, the atoms actually align themselves into separate magnetic domains, each with a net magnetic moment (caused my individually adding up those atomic dipole moments). In a common magnet (ferromagnet), these domains all point the same direction and stay that way, creating a permanent bulk magnetic dipole.

So in a way, there is no difference between the magnetic field of an atom and that of a magnet because one is simply a sum of the other, making both magnetic dipoles. Of course, here we see that there's nothing that fundamental about the magnetic force. In reality, the magnetic force is a relativistic effect caused by the movement of a charged particle, making electricity (i.e. charge) the underlying property at work here. Electromagnetic induction is really a shortcut to understand the magnetic force without worrying about relativistic mechanics. If we were to discover magnetic monopoles (i.e. "magnetic" charge), this would re-write a lot that we know about electromagnetism because we couldn't label all magnetic forces as by-products of moving electric charge

The features of a standard hydrogen electrode are :

1. Temperature of 298 K (25°C)

2. Carbon electrode

3. Hydrogen gas at 1.01 x 10^5 Pa (1 atm) pressure

4. Electrolyte solution containing a hydrogen ion activity of 1 mol/L

5. Platinum wire as the current collector

6. A Potential of 0.00 V (relative to the hydrogen gas)

These features are what make up the Standard Hydrogen Electrode (SHE). The temperature of 298 K is the temperature at which the SHE is calibrated and is the standard temperature used in most laboratory experiments. The carbon electrode serves as the interface between the hydrogen gas and the electrolyte, and the hydrogen gas is held at 1.01 x 10^5 Pa (1 atm) pressure. The electrolyte solution contains a hydrogen ion activity of 1 mol/L, which is necessary for the electrode to function properly. A platinum wire is used as the current collector, and the electrode has a potential of 0.00 V, relative to the hydrogen gas. All of these features are necessary for the SHE to function properly and for the electrode to serve as the reference for all other electrochemical measurements.

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Answer:

liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation and separation of various components of crude oil. This method works because the liquids in the mixture have different boiling points.

Explanation:

please give 5 star

Answer:

I think its b, but ik not completely sure.

Answer:

I think the second one...

Answer:

The first ionization energy for K is less than Ca because Ca has a larger effective nuclear charge. There is a large increase in the second ionization energy for K compared to Ca because removal of the second electron from K is a core electron that is in a quantum shell closer to the nucleus.

Explanation:

Answer:1 mol of Mg(NO3)2 contains 6.022*10^23 molecules

3 mol Mg(NO3)2 contains 3*6.022*10^23 = 1.81*10^24 molecules

Each Mg(NO3)2 molecule contains 2 N atoms  

Number of N atoms = 2*1.81*10^24 = 3.62*10^24 N atoms.

The number of atoms in 3 moles of nitrogen is; 6 atoms

According to the question:

Since nitrogen is a diatomic element;

This means that in it's natural state; Nitrogen is written as, N2.

As such, there are 3× 2 atoms of nitrogen in 3 moles of nitrogen.

We can then say we have 6 atoms of nitrogen in 3 moles of nitrogen.

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High-quality scientific research is characterized by several key criteria. Three examples of such criteria include: rigorous experimental design and methodology, reliable data analysis and interpretation, and clear and transparent reporting of results.

These criteria ensure that research is conducted in a systematic and reliable manner, leading to trustworthy and valid findings.

Rigorous Experimental Design and Methodology: High-quality scientific research requires a well-designed experimental approach. This involves careful planning, proper control groups, randomization, and replication. A rigorous methodology ensures that experiments are conducted under controlled conditions, minimizing bias and confounding variables, and allowing for accurate and reliable data collection.

Reliable Data Analysis and Interpretation: After data collection, high-quality research involves thorough and appropriate analysis of the data. This includes using appropriate statistical methods to evaluate the significance of the results and drawing valid conclusions. Proper data analysis helps researchers identify patterns, trends, and relationships, supporting or refuting their hypotheses in an objective and reliable manner.

Clear and Transparent Reporting of Results: High-quality research demands transparent reporting of the methods, procedures, and findings. This includes providing detailed descriptions of the experimental setup, data collection processes, and statistical analyses used. Clear reporting allows other researchers to replicate the study and verify its results. Additionally, complete reporting ensures that readers can understand the research methodology and draw their own conclusions based on the evidence presented.

By adhering to these criteria, high-quality scientific research maintains integrity, credibility, and reproducibility. It fosters trust among the scientific community and facilitates the advancement of knowledge by building upon reliable foundations.

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Answer:

L-2.75 W-2.75 H-2.85

Explanation:

Answer:

No, they would not be balanced because their weights would change.

Explanation:

Weight is the effect that gravitational pull has on objects on Earth whereas mass is how much matter there is in an object. Mass does not change despite gravitational pull, but the force of gravity (weight) is different depending on where you are.

Correct number to balance the equation: ___KClO3 → 2KCl 3O2 is "2".

We obtain KCl and oxygen gas from the breakdown of potassium chlorate (KClO3).

1.5 moles of O2 gas and one mole of KCl are produced from one mole of KClO3.

Therefore, the response will be:

KCL)3 - - > KCL + 3/2 O2

The entire equation will be multiplied by two in order to transform the fractional coefficient to a whole number.

2X [ KCLO3 - - > KCL + 3/2 O2 ]

A balanced equation will therefore be:

2KCLO3 - - > 2KCL + 3 O2

KClO3's coefficient is therefore "2".

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Answer:

8

EXPLANATION hope this helps you

Answer:8

Explanation:

Answer:

Xe that is xenon

Explanation:

Xe that is xenon

A redox reaction is when there is simultaneous oxidation and reduction. CuO+H2→Cu+H2O. Example: In this reaction, hydrogen is oxidised to water while copper oxide is reduced to copper.

By assuming that all bindings to the atoms in molecules are ionic, we can use the oxidation numbers assigned to atoms in molecules to detect redox reactions. In a reaction, oxidation is shown by an increase in the number of oxidations, and reduction is indicated by a copper. Consider the sodium-water reaction. In this reaction, sodium removes hydrogen from water while both becoming oxidised by obtaining oxygen and reducing the water to hydrogen by removing oxygen at the same time.

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Answer: they have the same mass

Explanation:weight is calculated

The number of moles of Ag that forms from 5.0 moles of Zn is 10 moles.

The number of moles of a substance can be calculated stoichiometrically as follows;

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, silver nitrate reacts with zinc to produce silver and zinc nitrate as follows:

2AgNO₃ + Zn → 2Ag + Zn(NO₃)₂

Based on the equation above, 1 mole of Zn produces 2 moles of silver.

Hence, 5 moles of Zn will produce 10 moles of Ag.

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Typically, the actual yield is lower than the theoretical yield because few reactions complete (i.e., are not 100% efficient) or because not all of the product in a reaction is collected. It is also conceivable for the real yield to exceed the theoretical yield.

What is theoretical yield ?

Theoretical yield is what would be obtained if 100% of the reaction was completed and no product was wasted in any way; however, procedures are not this efficient. Everything is dependent on the experimenter's precision and the reaction. Some reactions are reversible, meaning that less than 100% of the reaction proceeds to completion; some reactions do not go to completion because they require a large amount of energy or additional time, for example. Substances in the reaction may be lost throughout the method or difficult to separate from other sections of the experiment. In chemistry, some degree of inaccuracy is always expected.

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The percent yield of indigo : 79.6%

Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

2C₁₀H₁₁NO₄ + 2H₂O → C₁₆H₁₀N₂O₂ + 2C₂H₄O₂ + 4H₂O

Actual yield = 1.87 g

Theoretical yield = 2.35 g

The percent yield of indigo :

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{1.87}{2.35}\times 100\%=\boxed{\bold{79.6\%}}\)

Answer:

Mg(s) + Cl₂  -------> MgCl₂

Explanation:

In the equilibrium constant expression, the concentrations of pure solids and pure liquids are not included because their concentrations are considered to be constant and do not affect the reaction quotient. This is because the concentration of a pure solid or liquid does not change with the addition or removal of another reactant or product. Therefore, they are not considered when calculating the equilibrium constant expression. Only the concentrations of aqueous or gaseous reactants and products are included in the expression.

~~~Harsha~~~