what is ∆h when 123.6 g octane (c8h18, molar mass = 114.2 g/mol) undergoes combustion according to the thermochemical equation below?

Answer: D. Solids made of molecules

Explanation:

Answer:

1. 254 milli

2. 5.3 centi

Explanation:

254 milli = 25.4 centi

53 milli = 5.3 centi

You would need to add 250 mL of water.

The University of North Texas (UNT) Chemistry Department offers various scholarships to support undergraduate and graduate students who are pursuing degrees in chemistry or biochemistry.

These scholarships are intended to provide financial assistance to students who have demonstrated academic excellence, leadership potential, and a commitment to the field of chemistry.

The scholarships offered by the UNT Chemistry Department vary in terms of eligibility requirements, award amounts, and application procedures. Some scholarships are open to all chemistry and biochemistry majors, while others are more specific in their requirements, such as being a Texas resident, a U.S. citizen or permanent resident, or having a particular area of research interest.

The application typically includes information about the student's academic record, research experience, community involvement, and financial need. Some scholarships may require additional materials, such as letters of recommendation, a personal statement, or a research proposal.

Students who are awarded scholarships from the UNT Chemistry Department can use the funds to pay for tuition, fees, books, and other educational expenses.

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The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

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Answer:

Hg(NO3)2 + Na2CO3 --> 2NaNO3 + HgCO3

The snack containing 10 g of carbohydrates, 2 g of protein, and 5 g of fat has a total of 93 calories.

To calculate the total number of calories in the snack, we need to consider the caloric content of each macronutrient (carbohydrates, proteins, and fats).

Carbohydrates: Carbohydrates provide 4 calories per gram. In this case, 10 g of carbohydrates would contribute 10 g * 4 calories/g = 40 calories.

Proteins: Proteins also provide 4 calories per gram. With 2 g of protein, we have 2 g * 4 calories/g = 8 calories.

Fats: Fats provide 9 calories per gram. For the 5 g of fat in the snack, we have 5 g * 9 calories/g = 45 calories.

Now, to find the total calories, we add up the calories from each macronutrient: 40 calories (carbohydrates) + 8 calories (protein) + 45 calories (fat) = 93 calories.

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The alpha decay of the isotope of the element produces lead-206 is the polonium (Po)- 210.

Alpha decay is the process, the alpha particles is the emitted when the heavier nuclei decays into the lighter nuclei. Then the  alpha particle released has the charge of the +2 units.

The representation of the alpha decay is as :

\(X^{A}{z} }\) --->  Y⁴₂  +  α⁴₂

Y⁴₂  = Pb²⁰⁶₈₂

Z - 2 = 82

Z = 84

A - 4 = 206

A = 210

The atomic mass, A = 210

The atomic number, Z = 84

Therefore, the element is the polonium (Po) that has the atomic number is the 84 and the atomic mass is the 210.

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Increasing the NaCl concentration will increase the osmotic pressure.

Osmotic pressure, alongside the vapor pressure depression, freezing point depression and the boiling point elevation are the colligative properties od solution.

The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.

π = c(NaCl) × T(NaCL) × R

π is osmotic pressure

c is concentration of solution.

T is temperature in Kelvins.

R is universal gas constant.

Greater the concentration of sodium chloride, the greater is the osmotic pressure, because the osmotic pressure and the concentratio are in direct proportion.

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Yes, it is possible to make an aqueous solution of strontium hydroxide that gives a pOH of 10.54 because of thr Sr ions in the solution.

First, we can use the relationship between pH and pOH,

pH + pOH = 14

Since we want a pOH of 10.54, we can solve for the pH,

pH = 14 - pOH

pH = 14 - 10.54

pH = 3.46

Next, we can use the ionization constant expression for strontium hydroxide,

Sr(OH)₂(s) → Sr²⁺(aq) + 2OH⁻(aq)

Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴

Hence, the concentration will be given as,

[OH⁻] = 2[Sr²⁺]

Substituting this expression into the Kw expression, we get,

Kw = [H⁺][OH⁻] = [H⁺] (2[Sr²⁺])

1.0 x 10⁻¹⁴ = [H⁺] (2x)

where x is the molar concentration of strontium ions.

Solving for x, we get,

x = 1.0 x 10⁻¹⁴ / 2

x = 5.0 x 10⁻¹⁵

Therefore, the molar concentration of strontium ions in solution is 5.0 x 10⁻¹⁵ M.

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Answer:

Mass

Explanation:

I majored on Chemistry

Answer:

Mass

Explanation:

All forces require an input of mass

Answer:

since you have both the mass and density of the sample, the volume can be derived from both

volume of seawater = \(\frac{5.0}{1.025}\)

                                 = 4.88 ml (3 s.f.)

Jerell is having a test today that is a neuroimaging technique that uses the magnetic property of certain hydrogen atoms in his brain to create a detailed picture of his brain's structure. The test  he having is MRI.

MRI was developed as a neutral neuroimaging technique that leverages the magnetic propensity of some hydrogen atoms in the brain to produce a precise image of the structure of his brain.

A magnetic field and radio waves produced by a computer are used in the medical imaging procedure known as magnetic resonance imaging (MRI) to provide precise images of your body's organs and tissues.

Utilizing quantitative (computational) tools, neuroimaging studies the structure and function of the central nervous system. It was developed as an unbiased.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

The answer would be C. Giving the pea plants a different amount of water in each one can help you observe how much water produces the most peas in a pea pod.

The answer is C to give all of the pea plants different amounts of water and count the number of peas that the plants produce

Explanation:

Answer:

C. give all of the pea plants different amounts of water and count the number of peas that the plants produce

Explanation:

The class wants to design an experiment that answers the question, "What amount of water will cause the plants to produce the greatest number of peas?"

To answer the question, the experiment should show how many peas the plants produce when they are given different amounts of water. The best way to do this would be to give all of the plants different amounts of water and count the number of peas that the plants produce.

Answer:

a.2.1

b.2.7

im pretty sure these are the correct ones

ive seen something like this, that has the same exact pictures, although they were not this specific, the answers were 2 and 2.5

hope this helps :), im sorry if it doesn't

Explanation:

The equilibrium vapor pressure with respect to water (eow) is 259.9 Pa. assume that saturation vapor pressure is same as equilibrium vapor pressure.

Therefore, the RH at the frost point is  

RH = (eow / saturation vapor pressure) × 100

= (259.9 Pa / 259.9 Pa) × 100

= 100%

b) At T = -11 °C, we need to compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi) to determine if ice particles will form. From the given table, at T = -11 °C, the equilibrium vapor pressure with respect to water (eow) is 237.7 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 165.3 Pa.

The air is supersaturated with respect to ice, and the presence of Kaolinite particles can provide surfaces for water droplets to condense onto, leading to the formation of ice particles.

c) At T = -12 °C, we compare the equilibrium vapor pressure with respect to water (eow) and the equilibrium vapor pressure with respect to ice (coi). From the given table, at T = -12 °C, the equilibrium vapor pressure with respect to water (eow) is 217.3 Pa, and the equilibrium vapor pressure with respect to ice (coi) is 181.2 Pa.

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Answer:

What is the name of the substances that are used at the beginning of a chemical reaction?

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

Explanation:   :)

Answer:

Row

Explanation:

No explanation needed.

The force that exists between electrically charged particles or objects at rest is known as the electrostatic force.

Due to their electric charges, particles can be attracted to or repelled by electrostatic forces. This force is also known as the Coulomb force or Coulomb contact, and it was first described in 1785 by French physicist Charles-Augustin de Coulomb.

While opposite charges attract one another, like charges repel one another. For instance, two positively charged protons, two negatively charged electrons, or two anions all repel one another. Both cation and anions, as well as protons and electrons, are drawn to one another.

Hence, electrostatic forces exist between charged particles..

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Answer:

electroluminescence is a production of light by the flow of electrons, as within certain crystals. An example is at most resataurants with a bright sign that either says open or closed.

Explanation:

Answer:

The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.

Explanation:

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The pH of a solution can be determined using the equation pH = -log[H+], where [H+] represents the concentration of hydrogen ions in the solution. the pH of the solution prepared by dissolving 0.350 mol of acid in 1.0 L of a conjugate base is approximately 0.457.

To find the pH, we need to consider the dissociation of the acid and the subsequent formation of the conjugate base. The acid will donate a proton (H+) to the water, resulting in the formation of the conjugate base.  Let's assume that the acid completely dissociates, meaning that all 0.350 mol of acid will produce 0.350 mol of hydrogen ions (H+).

Now, we can use the pH equation to find the pH of the solution  In this case, we are given that 0.350 mol of acid is dissolved in 1.0 L of a conjugate base.  pH = -log(0.350) = 0.457 Since the final volume is 1.0 L, the concentration of hydrogen ions ([H+]) will be 0.350 M.

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Answer: What best describes the reaction is "A single replacement reaction takes place because zinc is more reactive than hydrogen."

. How many joules of heat are absorbed to raise

the temperature of 37 grams of water from 25°C

to 75°C?

In the molecule C₆H₃(C₃H₇)₂(C₂H₅) there are C) 22 H atoms.

The conversion factor that is correct for converting from grams to kilogram is B) 1000 g = 1 kg.

To find the number of H atoms in the molecule C₆H₃(C₃H₇)₂(C₂H₅), you need to add up the number of H atoms in each part of the molecule. The first part, C₆H₃, has 3 H atoms. The second part, (C₃H₇)₂, has 14 H atoms (7 H atoms in each C₃H₇ group). The third part, (C₂H₅), has 5 H atoms. So, the total number of H atoms in the molecule is 3 + 14 + 5 = 22 H atoms.

To convert from grams to kilograms, you need to divide the number of grams by 1000. For example, if you have 5000 grams, you would divide 5000 by 1000 to get 5 kilograms. So, 5000 grams is equal to 5 kilograms. The correct conversion factor is 1 kg = 1000 g.

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The frequency of an x-ray wave with an energy of 2×10^(-17) J in hertz is 3.01 × 10^(16) hz.

We can find the value of frequency of an x ray wave by using the relation between energy and frequency.

As we know that,

Energy is directly proportional to the frequency of the wave.

Mathematically,

E = h. f

Where,

E is the energy in joule

f is the frequency of the wave in hertz

h is the planck's constant

Given,

E = 2 × 10^(-17)J

h = 6.63 × 10^(-34) kg.m2/s

By substituting all the values, we get

2 × 10^(-17)J = 6.63 × 10^(-34) kg.m2/s × f

f = 2 × 10^(-17)J / 6.63 × 10^(-34) kg.m2/s

f = 3.01 × 10^(16) hz.

Thus, we concluded that the frequency of an x-ray wave with an energy of 2×10^(-17) J in hertz is 3.01 × 10^(16) hz.

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Answer:

Inert gases or noble gases

Explanation:

These gases have 8 outer shells meaning their full so they won't allow chemical reactions therefore providing an inert environment hence the name inert gas.