a 10g cookie is burned in a calorimeter causing the temperature of 20 g water to change from 3°C to 5°C, What us the energy content of the 10g cookie?​

Answer:

See explanation

Explanation:

The reaction occurs as follows;

KBr(aq) + AgNO3(aq) ----> AgBr(s) + KNO3(aq)

Number of moles of AgBr formed = mass /molar mass =1.740 g/187.77 g/mol = 0.0093 moles

From the reaction equation;

1 mole of KBr yields 1 mole of AgBr

Hence the number of moles of KBr reacted = 0.0093 moles

Mass of KBr present = 0.0093 moles × 119g/mol = 1.11 g

Mass of KNO3 = 2.850 g - 1.11 g = 1.74 g

Percentage of KBr = 1.11 g/2.850 g × 100 = 38.9%

Percentage of KNO3 = 1.74 g/2.850 g × 100 = 61.1%

The molarity, amount and volumes required are:

Molarity of a solution is defined as the number of moles of a solute dissolved in a given volume in litres of the solution.

molarity = 2/0.1

molarity = 20. M

molarity mass of potassium iodide = 166 g/mol

100 mL = 0.1 L

number of moles = 10/166 = 0.06 moles

Molarity = 0.06/ 0.1

Molarity = 0.6 M

.

Molarity = 0.427/0.855

Molarity = 0.50 M

1500 mL = 1.5 L

molar mass of aluminium carbonate = 87 g/mol

number of moles = 2340/87 = 26.9 moles

Molarity= 26.9/1.5

Molarity = 17.9 M

100 mL = 0.1 L

molarity = 2.0

number of moles = 2.0 × 0.1 = 0.2 moles

molar mass of potassium iodide = 166 g/mol

mass = number of moles × molar mass

mass = 0.2 × 166

mass of potassium iodide = 33.2 g

Number of moles of potassium iodide = 25/166 = 0.15 moles.

Volume = number of moles/molarity

Volume of water needed = 0.15/0.6

Volume of water needed = 0.30 L or 300 mL

Number of moles of aluminium carbonate = 10/87 = 0.115 moles.

Volume = number of moles/molarity

Volume of water needed = 0.115/0.3

Volume of water needed = 0.383 L or 383 mL

Therefore, the molarity, amount and volumes required are:

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The solubility product of Calcium Carbonate is 15mg/l hence is insoluble in water and the water is under-saturated with respect to calcium.

Calcium Carbonate is only slightly soluble in water. The solubility product is 4.4 × 10⁻⁹, indicating that if equal concentrations of calcium and carbonate are formed only 6.8mg/l of calcium carbonate would be soluble. Thus determined by the data, the water saturation with respect to calcium is under-saturated.

Langelier Saturation Index Complex (LSI) is the indicator of the degree of saturation of calcium carbonate in water.  The under-saturated water effect is the result of the Langelier Saturation Index Complex(LSI) that is negative, hence states that there will be corrosion of pipings.

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Given data-

partial pressures are 51.0 psi , 15.0 psi , and 0.4 psi

According to Dalton's law,

Total pressure = ∑ partial pressure of all gases

                         = 51.0+15.0+0.7

                         =66.7 psi

1 psi = 0.068046 atm

So, total pressure = 4.538atm

What is Dalton's law-

The overall pressure exerted in a mixture of non-reacting gases is equal to the sum of the partial pressures of the individual gases, according to Dalton's law, often known as Dalton's law of partial pressures. John Dalton discovered this empirical law in 1801 and made it public in 1802. The ideal gas laws are connected to Dalton's law.

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Answer: o.8/11.o

Explanation:

Answer:

basically an atom consist of electons and protrons .

electrons have a negative charge and in a circut the charge of electorns is more.

Answer:

listed below.

Explanation:

Few properties of electrons include:

- Electrons are subatomic particles with an electric charge of -1.

- Electrons have mass of approximately 1/1836 that of the proton.

- Electrons revolve around the nucleus of the atom.

- Electrons spin around their own axis.

The correct lewis structure of methane(CH4)

C. H:C:H:H

Answer: The answer is D. Elements that share the same column

Explanation:

The elements occupying the same groups are sharing the same column. They have similar chemical and physical properties. Elements of the same group have the same number of valence electrons.

All elements are classified to different groups and periods. The horizontal rows in the table is called periods and the vertical column are called groups in periodic table.

There are 18 groups and 7 periods in periodic table. The atomic number increases from left to right along a period. Elements in a group are having same number of valence electrons and are having similar chemical and physical properties.

Elements in a groups shows similarity in reactivity and physical properties.  They show same trend in increasing or decreasing nature of physical quantities. A group is thus, representing a column in periodic table.  Therefore, option D is correct.

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Answer:

Protons:

- positive

- aka cation

- in the nucleus along with the neutrons

Electrons:

- negative

- aka anion

- situated in the orbital shells/configuration levels (there are many names)

Answer:

D

Explanation:

molecules have potential energy and kinetic energy.

Tempreture is defined as the average kinetic energy and internal energy is PE+KE. Pptential energy in particles or molecules is just there position relative to one another. A gas which has seperated particles will have a greater potential energy than a solid/liquid.

The steps to make chocolate so that it does not melt on my hands are: heat the chocolate up to 120 degree fahrenheit and then after removing the bowl cool down it below 80 degree fahrenheit.

The main reasons to temper chocolate are:

1. Tempered chocolate is firm and solid in nature at room temperature. This is critical when making the chocolate confections or decorations. Chocolate which is out of temper requires refrigeration to maintain its shape.

2. The appearance of tempered chocolate is much better than that of its un-tempered counterpart. Tempered chocolate is smooth in nature , shiny and evenly colored.

3. Chocolate that is not been tempered has a distinctly dull appearance and may develop fat bloom -- grayish-white spots on the surface of the chocolate where unstable beta crystals have gathered.

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Percent yield = 78.7% , the correct answer is D) 78.7%, which represents the percent yield of NaCl in the reaction.

To calculate the percent yield of NaCl in the given chemical equation, we need to compare the actual yield of NaCl with the theoretical yield. The theoretical yield is the amount of NaCl that would be produced if the reaction went to completion based on stoichiometry.

First, we need to determine the theoretical yield of NaCl. By examining the balanced equation, we can see that the stoichiometric ratio between CuCl2 and NaCl is 1:2. This means that for every 1 mole of CuCl2, 2 moles of NaCl are produced.

Step 1: Convert the mass of CuCl2 to moles using its molar mass.

Molar mass of CuCl2 = 63.55 g/mol (atomic mass of Cu) + 2 × 35.45 g/mol (atomic mass of Cl)

Molar mass of CuCl2 = 134.45 g/mol

Moles of CuCl2 = 31.0 g / 134.45 g/mol ≈ 0.231 mol

Step 2: Use the stoichiometry to calculate the theoretical yield of NaCl.

Since the stoichiometric ratio between CuCl2 and NaCl is 1:2, the moles of NaCl produced will be twice the moles of CuCl2.

Moles of NaCl (theoretical) = 2 × 0.231 mol = 0.462 mol

Step 3: Convert the moles of NaCl to grams using its molar mass.

Molar mass of NaCl = 22.99 g/mol (atomic mass of Na) + 35.45 g/mol (atomic mass of Cl)

Molar mass of NaCl = 58.44 g/mol

Theoretical yield of NaCl = 0.462 mol × 58.44 g/mol ≈ 26.96 g

Now, we can calculate the percent yield using the formula:

Percent yield = (Actual yield / Theoretical yield) × 100

Percent yield = (21.2 g / 26.96 g) × 100 ≈ 78.7%

Option D

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The Elution sequence of compounds containing certain functional groups from the fastest to the slowest is hydrocarbons, olefins, ethers, halo carbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.

Elution:

Elution in organic and analytic chemistry refers to the process in which one material is extracted from another material by washing it with the help of a solvent.

In an elution sequence, regardless of the polarity of the compounds, the solvent which is more polar, its chemicals elutes faster. Therefore, amending the polarity of the solvent will not change the order of elution of compounds. It might seem contradictory as a polar solvent seems to convey polar compounds beyond the non-polar compounds.

Contemplating the solvents and the chemicals will fight for the stationary phase locations conductive to help us visualize the intention. Slow elution would be created by the molecules which were remained to attach to the stationary phase due to poor ability of a less polar solvent to compete. Molecules and a polar solvent successfully asserted for the stationary phase locations.

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D) 2.05 g N. The molar mass of N2H4 is 32.045 g/mol. To calculate the mass of N in 2.34 g of N2H4, we need to first calculate the number of moles of N2H4:

moles of N2H4 = (mass of N2H4) / (molar mass of N2H4)
moles of N2H4 = 2.34 g / 32.045 g/mol
moles of N2H4 = 0.073 mol

Since there are two N atoms in one N2H4 molecule, we need to multiply the number of moles of N2H4 by 2 to get the number of moles of N:

moles of N = 2 x moles of N2H4
moles of N = 2 x 0.073 mol
moles of N = 0.146 mol

Finally, we can calculate the mass of N:

mass of N = (moles of N) x (molar mass of N)
mass of N = 0.146 mol x 14.007 g/mol
mass of N = 2.05 g

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Answer:

percent yield = 80.7%

Theoretical yield of silver sulfide = 30.975 g

Actual yield  = 25 g

Explanation:

Given data:

Mass of silver = 27 g

Mass of silver sulfide formed = 25 g

Theoretical yield of silver sulfide = ?

Actual yield = ?

Percent yield = ?

Solution:

Chemical equation:

2Ag + S   →     Ag₂S

Number of moles of Ag:

Number of moles = mass/molar mass

Molar mass of silver = 107.8 g/mol

Number of moles = 27 g/ 107.8 g/mol

Number of moles = 0.25 mol

Now we will compare the moles of silver with silver sulfide.

               Ag         :       Ag₂S

               2            :         1

              0.25        :      1/2×0.25 = 0.125 mol

Theoretical yield of silver sulfide:

Mass = number of moles × molar mass

Mass = 0.125 mol ×  247.8 g/mol

Mass = 30.975 g

Actual yield is given in question = 25 g

Percent yield:

Percent yield = (actual yield / theoretical yield) × 100

Percent yield = (25 g/ 30.975 g ) × 100

percent yield = 80.7%

Based on the information given, we know that Block 1 is initially at 79°C and Block 2 is initially at 13°C. Heat begins to flow between the blocks until they reach thermal equilibrium.

During this process, heat will transfer from the hotter block (Block 1) to the cooler block (Block 2) until both blocks reach the same temperature.

Therefore, the only possible pair of temperatures for the blocks after reaching thermal equilibrium is a temperature between 13°C and 79°C. It could be any value within this range, depending on the specific heat capacities and thermal conductivity of the blocks.

In summary, any pair of temperatures between 13°C and 79°C is possible for the blocks after reaching thermal equilibrium.

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0.75 atm is the final pressure in the chamber.

CH3OH+O2⇄CO2+H2O

 P1n1=P2n2

P2=  P1n1/n2

p2=3/4

p2= 0.75 atm

The formula for pressure is force/area. For instance, dividing the weight of the snow by the surface area of the roof would reflect the pressure from snow on the roof. Gases are a common source of pressure in chemistry. The absence of pressure is described by the word "vacuum." For a very long time, people have believed that vacuums are both impossible and unnatural since "nature abhors a vacuum." This isn't the case, in reality.

The sheer number of pressure units is astounding! The torr or mmHg is a commonly used measurement. Here, the height of a mercury column is all that is being discussed. The air pressure is around 760 torr, or mmHg. You may also check out mmH2O, which makes use of a related concept.

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In this case, there are four bonding pairs and no lone pairs. Based on this, the molecular geometry of AB4 is tetrahedral.

The molecular geometry of AB4 can be determined by counting the number of electron pairs (bonding and nonbonding) around the central atom.

To predict the molecular geometry of the AB4 molecule, we can use the VSEPR (Valence Shell Electron Pair Repulsion) theory. Here's a step-by-step explanation:

1. Identify the central atom: In this case, the central atom is "A."
2. Determine the number of bonding pairs and lone pairs: Since it's an AB4 molecule, there are four bonding pairs (B atoms) and no lone pairs on the central atom A.
3. Apply the VSEPR theory: With four bonding pairs and no lone pairs, the electron pairs will try to minimize repulsion and arrange themselves symmetrically around the central atom.

Considering the given molecular geometries, the AB4 molecule will have a tetrahedral geometry, as this best minimizes the electron pair repulsion for four bonding pairs with no lone pairs on the central atom.

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Phosphorus (P) typically forms an ion with a charge of -3 when it becomes an ion.

This is on the grounds that phosphorus has 5 valence electrons in its furthest energy level (electron arrangement : [Ne] 3s² 3p³). Phosphorus typically gains three electrons to complete its valence shell, resulting in a full octet, in order to establish a stable electron configuration.

By gaining 3 electrons, phosphorus forms the phosphide ion (P³⁻), which has a charge of -3.

Valence electrons will be electrons in a molecule's external shell that can assist with shaping compound bonds. In single covalent bonds, both atoms in the bond typically contribute one valence electron to the formation of a shared pair.

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For an object  1 m long with a 5 m ramp, You pull with 20 N of force, The weight of the object is mathematically given as

W= 5714.3 N

Generally, the equation for the weight   is mathematically given as

W = mg = F/Sinθ

W= 20/Sin0.2

W=20/ 0.0035

W= 5714.3 N

In conclusion, the weight of the object

W= 5714.3 N

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The two most important attitudes that managers will approach their jobs with are: . Organizational commitment and Job satisfaction.

Organizational commitment: Organizational commitment refers to the level of attachment, loyalty, and dedication that managers have towards their organization. Managers who are highly committed to their organization are more likely to invest their time, energy, and effort into achieving the organization's goals and objectives. They exhibit a sense of responsibility and are willing to go above and beyond their formal job requirements. Organizational commitment contributes to higher job performance and lower turnover rates.

Job satisfaction: Job satisfaction refers to the extent to which managers are content and fulfilled in their roles. Managers who experience high job satisfaction are more likely to be motivated, engaged, and productive. They derive a sense of accomplishment and fulfillment from their work, leading to increased job performance and job-related well-being. Job satisfaction is influenced by various factors such as work-life balance, supportive work environment, opportunities for growth and development, and recognition for their contributions.

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Answer:

d) protons in its nucleus

Explanation:

-

Answer: 0.8mL

Explanation: Medication order calls  of penicillin g sodium to be added to 1 liter of d5wM = 400,000 units.

Available in the pharmacy = 5,000,000 units.

(400,000 X (mL/ 500,000) = 0.8mL

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The binding of H+ ions to soil particles displaces mineral cations.

Acid deposition adds hydrogen ions, which displace these important nutrients in a process called leaching.

Leaching means that the ions are washed deeper into the subsoil or washed out of the top soil. If ions are leached from the soil, they are no longer available to the roots of the plants.

Positively charged hydrogen ions displace positively charged mineral ions on soil particles.

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ANSWER

Temperature will remain the same

EXPLANATION

When water reaches it boiling point at 100 degrees Celcius, the molecules of water will start moving independently and collide with each other.

At 100 degrees Celcius, it has attained an equilibrium between the liquid and vapor phase. Therefore, when energy is added to it, the temperature will remain the same and there will be a phase change.

Hence, the temperature will remain the same.

1) List the known and unknown quantities.

Volume: 208,000 gallons.

Density: 1.00 g/mL.

2) Convert gallons to liters.

3.7854 L = 1 gal.

3) Convert g/mL to pound/L

1 pound = 453.59 g

1000 mL = 1 L

4) Mass of water in kg.

5) Convert pounds to tons.

1 ton = 2000 pounds

The conversion factors needed are those in option D.

.

Because of their differing nuclear charges, and as a result of shielding by inner electron shells, the different atoms of the periodic table have different affinities for nearby electrons.

The electron affinity is the potential energy change of the atom when an electron is added to a neutral gaseous atom to form a negative ion. So the more negative the electron affinity the more favourable the electron addition process is.

Not all elements form stable negative ions in which case the electron affinity is zero or even positive.

Electron affinity depends on the nuclear charge of an atom.

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Answer:

applied force .....I'm pretty sure

Answer:

A. Applied forces aka Contact forces

Explanation:

Thos force is created when you apply forces to an object as in a push/pull or other physical ways.

I hope it helps! Have a great day!

Anygays-