a dragster in a race accelerated from rest to 60 m/s by the time it reached the finish line. the dragster moved the distance from start to finish in 8.3 seconds. what is the dragsters acceleration?

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According to this question, Lignite coal is the lowest grade coal with the least concentration of carbon. It has a low heating value and high moisture content and is mainly used in electricity generation.

Answer: A. Lignite

The kind of substance which the original white powder that is isolated from lemon juice is: A an acid.

pH simply refers to an abbreviation for the power of hydrogen ions and it can be defined as a measure of the molar concentration of hydrogen ions in a particular chemical substance or solution.

This ultimately implies that, a pH scale can be used to measure and specify the acidity, neutrality or basicity (alkalinity) of any chemical substance or solution.

On a pH scale, a chemical substance or solution with a pH of 7 is neutral, a chemical substance or solution with a pH below 7 is acidic, and a chemical substance is basic (alkaline) when it's pH is above 7.

In this scenario, this original white powder is an acid because it has a pH of 3.0.

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Answer:

100,000 strides.

Explanation:

To find the number of strides taken in a 100k ultramarathon, we need to divide the total distance by the length of each stride.

100k = 100,000 meters

So, assuming that each stride was 1 meter long, the runner took 100,000 strides.

Hope this helps!

The correct answer is 76.9 g of \(Cl_{2}\) is required to react with 19.5 g of \(Al\). Therefore, the correct option is: 76.9 g.

What is Atomic Mass?

Atomic mass, also known as atomic weight or relative atomic mass, is a measure of the mass of an atom of a chemical element. It is expressed in atomic mass units (amu) or unified atomic mass units (u). Atomic mass is a weighted average mass of the naturally occurring isotopes of an element, taking into account their relative abundances.

The balanced chemical equation for the reaction is:

\(2Al\) (s) + 3\(Cl_{2}\) (g) → \(Al_{2}\)\(Cl_{6}\)

From the equation, we can see that the molar ratio between \(Al\)and Cl2 is 2:3. This means that 2 moles of \(Al\) react with 3 moles of \(Cl_{2}\)

To find out how many grams of \(Cl_{2}\) are required to react with 19.5 g of \(Al\) we need to convert the given mass of \(Al\) to moles using its molar mass, and then use the mole ratio from the balanced equation to calculate the amount of \(Cl_{2}\).

The molar mass of \(Al\) is 27 g/mol, and the molar mass of \(Cl_{2}\) is 2 * 35.45 g/mol = 70.9 g/mol.

Moles of \(Al\)= Mass of \(Al\)/ Molar mass of\(Al\)

Moles of \(Al\) = 19.5 g / 27 g/mol ≈ 0.722 mol

According to the mole ratio from the balanced equation, 2 moles of \(Al\)react with 3 moles of \(Cl_{2} .\)

Moles of \(Cl_{2}\)= Moles of \(Al\) * (3 moles of \(Cl_{2}\) / 2 moles of \(Al\))

Moles of \(Cl_{2}\) = 0.722 mol * (3/2) ≈ 1.083 mol

Now, we can convert moles of \(Cl_{2}\) to grams using its molar mass.

Mass of\(Cl_{2}\) = Moles of \(Cl_{2}\) * Molar mass of \(Cl_{2}\)

Mass of\(Cl_{2}\) = 1.083 mol * 70.9 g/mol ≈ 76.9 g

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Answer: \(K_a\) for the acid is \(2.7\times 10^{-4}\)

Explanation:

\(C_9H_7O_4H\rightarrow H^+C_9H_7O_4^-\)

   c             0             0

\(c-c\alpha\)        \(c\alpha\)          \(c\alpha\)  

So dissociation constant will be:

\(K_a=\frac{(c\alpha)^{2}}{c-c\alpha}\)

Give c= 0.313 M and \(pH\) = 2.031

\((\alpha)=0.030\)

\([H^+]=c\times \alpha\)

\([H^+]=0.500\times 0.030=0.015\)

Also \(pH=-log[H^+]\)

\(2.031=-log[H^+]\)

\([H^+]=0.009\)

[ \([H^+]=c\alpha\)  

\(c\alpha=0.009\)

Putting in the values we get:

\(K_a=\frac{(0.009)^2}{(0.313-0.009)}\)

\(K_a=\frac{(0.009)^2}{(0.304)}=2.7\times 10^{-4}\)

\(K_a\) for the acid is \(2.7\times 10^{-4}\)

4.13x10^5 g are equal to 413 kg.

Knowing that 1 kg is equal to 1000 g we can calculate the grams that are equal to 413 kg:

So, the answer in scientific notation is 4.13x10^5g.

The amount of heat energy required required to convert 72.0 g

of ice at − 18° C to water at 25° C is 31.9 kJ.

To calculate the amount of heat energy required to convert 72.0 g of ice at −18.0°C to water at 25.0°C, we need to consider two separate processes: first, the energy required to melt the ice (i.e., to convert it from a solid to a liquid), and second, the energy required to heat the liquid water from its initial temperature of 0°C to its final temperature of 25°C.

The energy required to melt the ice can be calculated using the formula:

\(Q1 = m × ΔH_fus\)

where Q1 is the heat energy required (in joules), m is the mass of the ice (72.0 g), and\(ΔH_fus\)is the heat of fusion of water (334 J/g).

Q1 = 72.0 g × 334 J/g = 24,048 J = 24.05 kJ

The energy required to heat the liquid water from 0°C to 25°C can be calculated using the formula:

\(Q2 = m × C × ΔT\)

where Q2 is the heat energy required (in joules), m is the mass of the water (also 72.0 g), C is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature (25°C - 0°C = 25°C).

Q2 = 72.0 g × 4.184 J/g°C × 25°C = 7,845.6 J = 7.85 kJ

Therefore, the total heat energy required to convert 72.0 g of ice at −18.0°C to water at 25.0°C is:

\(Q_total = Q1 + Q2\) = 24.05 kJ + 7.85 kJ = 31.9 kJ

Therefore, the amount of heat energy required is 31.9 kJ.

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Answer:The reactions are as follows: a carbon-12 (12C) nucleus captures a hydrogen nucleus (1H, a proton) to form a nucleus of nitrogen-13 (13N); a gamma ray (γ) is emitted in the process. The nitrogen-13 nucleus emits a positive electron (positron, e+) and becomes carbon-13 (13C).

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

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Answer:

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refer the three attached images for the respective answers.

hope helpful ~

Look at the mole ratio in the balanced equation

2CO + O2 ==> 2CO2

3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO

Answer:

increases

Explanation: As we move from left to right the atomic number increases due to which radii

What is the pH of a solution whose hydroxide ion concentration is 4.0×10-4 mol/L?

Solution:-

Hydroxide ion = [OH-] = 7.2×10−3 M

The pOH is calculated using the expression:

pOH = - log[OH-]

pOH = - log(7.2×10−3) = 2.14

The pH and pOH of a water solution at 25oC are related by the following equation:

pH + pOH = 14.

Then,

pH = 14 - pOH

pH = 14 - 2.14 = 11.86

pH = 11.86

pH value higher than 7. Therefore, the solution is basic.

Answer: The Solution is basic hence, pH=11.86.

The pH of the solution with a hydroxide ion concentration of 4.0×10⁻⁴ mol/L is approximately 10.60.

To find the pH of a solution with a hydroxide ion concentration of 4.0×10⁻⁴ mol/L, we can use the concept of pH and pOH.

The pH of a solution is a measure of its acidity or alkalinity and is defined as the negative logarithm (base 10) of the hydrogen ion concentration ([H+]) in moles per liter. The pOH, on the other hand, is the negative logarithm (base 10) of the hydroxide ion concentration ([OH-]) in moles per liter. The relationship between pH and pOH is as follows:

pH + pOH = 14

We are given the hydroxide ion concentration, which is 4.0×10⁻⁴ mol/L. To find the pOH, we can use the formula:

pOH = -log([OH-])

pOH = -log(4.0×10⁻⁴)

pOH = -(-3.397) = 3.40

Now, to find the pH, we can use the relationship between pH and pOH:

pH = 14 - pOH

pH = 14 - 3.40

pH = 10.60

Therefore, the pH of the solution with a hydroxide ion concentration of 4.0×10⁻⁴ mol/L is approximately 10.60. This pH value indicates that the solution is basic since it is greater than 7. A pH of 7 is considered neutral, pH values below 7 indicate acidity, and pH values above 7 indicate alkalinity. In this case, the solution is alkaline due to the presence of a relatively high concentration of hydroxide ions.

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Answer:

option D 17proton ,17electron and 18 neutrons

Answer:

ES UN MINERAL Y ESTA FORMADO POR ATOMOS DE OROExplicación:SI TE SIRVIO DA GRACIAS Y DA CORONA

Explanation:

Answer:

3

Explanation:

For numbers with decimals, count the number after the decimal.

The ice pack gets colder when the inside barrier is broken and the chemicals mix together as instant cold packs employ this type of endothermic reaction.

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The direction of heat transfer between two samples of carbon depends on their temperature difference, and not solely on their average kinetic energy. While the average kinetic energy of a substance is related to its temperature, it is not the determining factor for the direction of heat transfer.

When two samples of carbon come into contact, a heat transfer will occur between sample A and sample B. The direction of heat transfer is dependent on the temperature difference between the samples. Heat transfer always flows from a hotter object to a cooler object, so if sample A is hotter than sample B, heat will flow from A to B. If sample B is hotter than sample A, heat will flow from B to A.
The average kinetic energy of the molecules in a substance is related to its temperature. The higher the average kinetic energy, the higher the temperature of the substance. However, the average kinetic energy does not determine the direction of heat transfer.
It is possible for a substance with a lower average kinetic energy (and therefore a lower temperature) to transfer heat to a substance with a higher average kinetic energy (and therefore a higher temperature). This can occur if the substance with the lower temperature has a greater heat capacity, which means it can absorb more heat without a significant increase in temperature.

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The van't Hoff factor for C5H4 is 1.

The van't Hoff factor, denoted as i, represents the number of particles that a solute dissociates into when it dissolves in a solvent. In the case of C5H4, which is a neutral compound, it does not dissociate or ionize when it dissolves in a solvent.

Therefore, the van't Hoff factor for C5H4 is 1, indicating that it remains as a single particle in the solvent.

When a solute dissolves in a solvent, it can sometimes dissociate into multiple particles, such as ions or molecules.

This leads to an increase in the total number of particles in the solution, affecting various properties like colligative properties (e.g., boiling point elevation, freezing point depression).

However, C5H4 does not exhibit this behavior and does not break apart into ions or molecules upon dissolution. Hence, the van't Hoff factor for C5H4 is 1, implying that it does not affect the colligative properties of the solution since it remains as a single particle.

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A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.

Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.

Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.

Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.

Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.

The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.

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Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

where is the question????????????

The diagram shows a picture of a compound.

A compound is a substance that is made up of two or more different elements that are chemically bonded together in a specific ratio.

This means that the elements are combined in a way that creates a new substance with different physical and chemical properties than the individual elements.

Compounds can be formed through a variety of chemical reactions, such as combining elements through a chemical bond or through a reaction between an acid and a base.

So for the given diagram, we can see that it represents two or more elements chemically combined.

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The numerical value of Kc for the given reaction, with the equilibrium mixture containing 0.0450 M PCl3, 0.116 M Cl2, and 25.8 M PCl5, is approximately 4942.03.

To calculate the numerical value of Kc for the given reaction, we need to set up an expression for the equilibrium constant using the concentrations of the species involved.

The balanced equation for the reaction is:

PCl3 (g) + Cl2 (g) ⇌ PCl5 (g)

The equilibrium constant expression, Kc, is given by:

Kc = [PCI5] / ([PCl3] * [Cl2])

Given the equilibrium concentrations:

[PCl3] = 0.0450 M

[Cl2] = 0.116 M

[PCI5] = 25.8 M

Substituting these values into the equilibrium constant expression, we have:

Kc = (25.8 M) / ((0.0450 M) * (0.116 M))

Calculating Kc:

Kc = 25.8 M / (0.00522 M^2)

Kc = 4942.03

Therefore, the numerical value of Kc for the given reaction, with the equilibrium mixture containing 0.0450 M PCl3, 0.116 M Cl2, and 25.8 M PCl5, is approximately 4942.03.

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Answer:

yes

Explanation: Our DNA determines how many muscle fibers a person is born with. This number never changes cause one can't make more muscle fibers during their lifetime. With more muscle fibers, one has the potential to be stronger.

It is an acquired trait because you could train your muscles to become bigger. When you train, for example resistance training, your muscle produces more myofilaments which increases their diameter. This is why you develop large muscles when you train.