the complete combustion of 0.441 g of a snack bar in a calorimeter (ccal = 6.15 kj/°c) raises the temperature of the calorimeter by 1.63 °c. calculate the food value (in cal/g) for the snack bar.

Answer:

2051.9936 g

Explanation:

Mass = ?

Number of moles = 51.2 mol

The relationship between both quantities is given by the equation;

Number of moles = Mass / Molar mass

Solving for mass;

Mass = Number of moles * Molar mass

Mass = 51.2 * 40.078

Mass = 2051.9936 g

Answer:

Post the equations for help :)

Explanation:

The relationship between the change in Gibbs free energy (ΔG) and the emf of an electrochemical cell is given by the equation ΔG = -nFE, where n is the number of moles of electrons transferred, F is the Faraday constant (96,485 C/mol), and E is the emf of the cell.

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by the equation ΔG = -nFE, where ΔG is the change in Gibbs free energy, n is the number of moles of electrons transferred, F is Faraday's constant (96,485 coulombs per mole of electrons), and E is the emf of the cell.

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Answer:

The answer is C4H8.

Explanation:

I hope it helps you

Pass your test fast okay

BYE!

Answer:

Answer to the following question is as follows;

Explanation:

Alkynes' vapour pressure and normal boiling points are altered when chain length grows, since vapour pressure rises while boiling point falls.

Vapour pressure always include pressure entered by vapour with its condensed phase, pressure include molecules force of attraction include vapour

Answer:

there you go man

Explanation:

To calculate the energy required to heat a substance, we can use the formula:

Q = mcΔT

where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

Given that we have 712.0 g of graphite, a specific heat capacity of 0.710 J/g-K, and a temperature change of 18.7 °C (20.7 °C - 2.0 °C)

Q = (712.0 g) x (0.710 J/g-K) x (18.7 °C)

Q = 10,965.64 J.

The energy required to heat 712.0 g of graphite from 2.0 °C to 20.7 °C is 10.965 kJ.

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The coordination number of cobalt in [Co(en)₂Cl₂]Cl is 6.

The formula [Co(en)₂Cl₂]Cl indicates that there are two ethylenediamine (en) ligands, each of which can donate two electrons to the cobalt ion (Co), making a total of four electrons donated by the ligands.

Additionally, there are two chloride (Cl⁻) ions, each of which can donate one electron to the cobalt ion. Therefore, there are a total of six donor atoms surrounding the cobalt ion, which gives a coordination number of 6.

The coordination number of a metal ion is the number of donor atoms that are directly bonded to the metal ion. In this case, the ethylenediamine ligands are bidentate, meaning that they can form two bonds with the metal ion, and each chloride ion can form one bond with the metal ion.

Therefore, the total number of donor atoms surrounding the cobalt ion is six, which gives a coordination number of 6.

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Answer:

The change from a liquid phase to a gaseous phase.

so the answer would be it changed to a gaseous phase

---------------

This is what occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.

Answer:

Pasteurization involves heating liquids at high temperatures for short amounts of time. Pasteurization kills harmful microbes in milk without affecting the taste or nutritional value (sterilization= all bacteria are destroyed).

Explanation:

Acids taste sour, are corrosive to metals and tissues, change the color of litmus to red, and become less acidic when mixed with bases.


Acids have a distinct taste of sourness. This taste is due to the presence of hydrogen ions (H+) in the acid that stimulate the sour receptors on our tongue. However, it's important to note that tasting acids can be dangerous and should never be done without proper safety measures.

Acids have a corrosive nature, meaning they can erode or damage certain materials like metals and tissues. This property is due to the ability of acids to donate hydrogen ions, which can react with the material's surface and break it down.

Litmus is a pH indicator that changes color in response to acidic or basic solutions. When an acid is added to litmus, it turns red, indicating the presence of an acidic solution. This color change occurs due to the acidic solution's ability to donate hydrogen ions that react with the litmus indicator.

When an acid is mixed with a base, it results in a neutralization reaction. In this reaction, the acid and base react to form water and a salt, ultimately reducing the acidity of the solution. This happens because the base accepts hydrogen ions from the acid, reducing the concentration of H+ ions and increasing the concentration of OH- ions.

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The partial pressure of oxygen is 0.49 atm.

To find the partial pressure of oxygen, we need to first calculate the total pressure of the mixture using the ideal gas law:

PV = nRT

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

Rearranging this equation, we get:

P = nRT/V

Substituting the given values, we have:

P = (0.30 + 0.20 + 0.40 + 0.10) mol x 0.0821 L·atm/mol·K x 273 K / 22.4 L

 = 2.44 atm

The partial pressure of oxygen can be calculated by multiplying the mole fraction of oxygen by the total pressure:

moles of O2 = 0.20 mol

moles of all gases = 0.30 + 0.20 + 0.40 + 0.10 = 1.00 mol

mole fraction of O2 = moles of O2 / moles of all gases = 0.20 / 1.00 = 0.20

partial pressure of O2 = mole fraction of O2 x total pressure = 0.20 x 2.44 atm = 0.49 atm

Therefore, the partial pressure of oxygen is 0.49 atm.

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Answer:

D: a new substance

Explanation:

Chemical reaction

A change in matter that produces on or more new substances

Answer:

D. A new substance is always a result of a chemical reaction.

Explanation:

In a chemical reaction, one or more reactants reacts/decomposes to form one or more products.

Answer:

yes

Explanation:

i don't have the periodic table in front of me right now but you will need it. for the first coloumn, look at the elemnt symbol and write it down. for example hydrogen H. the atomic mass will be written on the bottom of the entry. the atomic number is on the top. the number of protons is the atomic number. the neutrons is atomic mass-atomic number and the electrons you have to count the numbers in the upper right corner. depends what element you look at, there might be a couple rows of the electrons which are the shells. hope i helped :)

Among the given compounds, the strongest acid is CH3COOH. It is also known as acetic acid or ethanoic acid.

Acetic acid is a weak acid, but it is stronger compared to the other compounds listed. CH3COOH has a carboxylic acid functional group (-COOH) which can donate a hydrogen ion (H+) in solution, making it an acid. This functional group contains an electronegative oxygen atom that can stabilize the negative charge on the conjugate base, resulting in a more acidic compound.

On the other hand, the other compounds listed do not possess an acidic functional group. CH3CH2OH is ethanol, which is a neutral molecule. CH3C||OH is methyl alcohol or methanol, which is also a neutral molecule. CH3OCH3 is dimethyl ether, a neutral compound. CH3C||OOCH3 is methyl acetate, which is a neutral ester. Therefore, among the options provided, CH3COOH (acetic acid) is the strongest acid.

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Answer:

it is a result of hydrogen bonds present within water molecules.

Explanation:

when the water is transformed to ice at zero degrees Celsius, the water molecules are in crystal lattice in a structure that has a lot of empty space around each molecule.

Answer:  moles= 0.44moles

Explanation:

Moles = mass/molar mass

Molar mass of NaOH= 23+16+1= 40gmol-1

n= 17.6/40= 0.44 moles

i hope i helped u

The neutral organic product obtained from the reaction is propene (CH3CH=CH2)

The given reaction involves the dehydration of 1-propanol (CH3CH2CH2OH) in the presence of concentrated sulfuric acid (H2SO4) at 200°C. Dehydration is the removal of a water molecule from the alcohol compound. In this case, 1-propanol loses a water molecule to form propene (CH3CH=CH2), which is an alkene.

The neutral organic product resulting from this reaction is propene (CH3CH=CH2). The reaction occurs as the hydroxyl group (-OH) of 1-propanol is protonated by the acidic H2SO4, leading to the loss of a water molecule. This creates a double bond (C=C) between the second and third carbon atoms, resulting in the formation of propene.

Thus, the neutral organic product obtained from the reaction is propene (CH3CH=CH2).

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Explanation:

A. mole=mass/molar mass

Molar mass of NaCl=23+35.5g

NaCl=58.5g

from

mole=0.90/58.5mol

mole=0.90g/58.5mol

mole=0.15

B. concentration=number of moles of solute/volume of solution

concentration=0.15mol/250cm^3

1dm^3=1000cm^3

250=0.25

concentration=0.6mol/dm^3

Answer:

The potential energy of the products is greater than the potential energy of the reactants

Explanation:

i just took the test

In an endothermic reaction, activation potential energy of reactants is less than that of the products. Reactants in endothermic reaction are absorbing enough heat energy to overcome this barrier potential. Hence, option B is correct.

An endothermic reaction is the one in which heat energy is absorbed by the reactants from the surroundings. In endothermic reactions, the enthalpy change is positive.

The minimum energy that the reactants have to acquire for effective collision and reaction is called the activation energy. By absorbing heat energy reactants becomes  more energetic and overcome this activation potential.

Therefore, in an endothermic reaction, the activation potential of products will be higher than that of the reactants and the energy diagram  clearly exhibit this transition in energy. Hence, option B is correct.

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Answer: sorry its lagging i hope this help fore 18.. =D

Explanation:

n,s is repeating the cycle of the inside

Answer/Explanation:

18, a,

I believe the n, and s represents North, South, or just the way the arrows are rotating repeatedly.

18, b,

The phenomenon re-occurring shows the alignment of magnetic dipoles with in a magnet, like inside. The arrows show a direction in the line with an external magnetic field in a way that it can produce its own magnetic fields that seem to travel from North to the South.

18, c,

Incorrect. Refrigerator magnets have multiple layers of magnification, they use opposite polarities to stay this way. If he puts the magnet sideways it may stick to the fridge

~ LadyBrain

By adding sodium dodecyl sulfate (SDS) during the electrophoresis of proteins, it is possible to denature the proteins and give them a negative charge, making them separate based on size during electrophoresis.

SDS is an anionic detergent that binds to proteins and unfolds them, resulting in a uniform negative charge distribution along the length of the protein. This allows the proteins to migrate through the gel matrix based solely on their molecular weight, rather than their shape or net charge. The SDS-PAGE technique, which uses SDS as a key reagent, is widely used for the separation and analysis of proteins. During SDS-PAGE, the protein samples are first denatured and treated with SDS, then loaded into wells of a polyacrylamide gel, and subjected to an electric field. As a result, the proteins migrate through the gel in proportion to their molecular weight, with smaller proteins moving faster and larger proteins moving slower. The separated proteins can then be visualized and analyzed using various staining and detection methods.

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The enthalpy change (ΔH) for the physical change of Br2 from the gas phase to the gas phase (Br2(g) → Br2(g)) is zero. The entropy change (ΔS) for this physical change is also zero.

In a physical change, the chemical substance remains the same, and there is no breaking or forming of chemical bonds. In the case of Br2 going from the gas phase to the gas phase, there is no change in the chemical identity or composition of the substance.

The enthalpy change (ΔH) measures the heat energy transfer during a reaction or process. Since there is no change in the chemical bonds or composition of Br2 in this physical change, there is no transfer of heat energy, and thus ΔH is zero.

The entropy change (ΔS) quantifies the degree of disorder or randomness in a system. In this physical change, the arrangement and distribution of Br2 molecules remain unchanged, leading to no change in entropy. Therefore, ΔS is also zero.

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Answer:

Randy went into the classroom without the teacher being present. He opened  containers of chemicals without the teacher's consent. Randy is making contact with the chemicals on his skin.

I hope this helps! I haven't done lab science in a while so I'm trying to remember the safety precautions.

Randy went into the classroom without the teacher being present and opened  containers of chemical, making contact with chemicals on skin leads to skin reaction.

So Randy should follow the lab safety rules while entering into lab.

After entering lab wear apron and gloves along with safety goggles if working with any hazardous or infectious substance.

Fully aware about the hazards of the materials, properly trained to handle lab equipment, chemicals should be adequately labelled.

Taste or smell chemicals are prohibited, never pour already stored chemicals, chemical hygiene plan should be developed for specific hazards.

Avoid to adopt un-tested and unauthorized experimentation, Clean up all chemical spill, Laboratory induction should be carried out .

Avoid storage of any edible items in the refrigerator along with lab chemicals and specimens, clean the work station after completing experiment and sterilization should be done before starting experiment.

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Answer:

They all are made up of cells

Answer: They are all made of cells.

Explanation:

A. Paper makes up the largest proportion of MW in the United States. (False)  C. Total waste generation in the United States has been steadily increasing since about 1950. Globally. (False)

D. Solid waste management costs are expected to begin decreasing as waste management technology gets cheaper. (False)

The false statements are A, C, and D.

A. Paper does not make up the largest proportion of municipal waste (MW) in the United States. While paper waste is significant, it is not the largest component. Other materials like food waste, plastics, and metals also contribute to MW.

C. Total waste generation in the United States has not been steadily increasing since about 1950. In fact, waste generation rates have fluctuated over the years due to various factors such as population growth, consumption patterns, and waste management practices.

D. Solid waste management costs are not expected to decrease as waste management technology gets cheaper. While advancements in technology can lead to more efficient waste management processes, they often come with their own costs, such as implementation, maintenance, and regulatory compliance. These factors can offset any potential cost savings and may even lead to an increase in waste management costs over time.

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The maximum possible efficiency for such an engine is 6.039 %.

Temperature of water near the surface of a tropical ocean = 298.2 K

Temperature of water 700 m beneath the surface = 280.2 K

To find the maximum possible efficiency for the given heat engine,

The maximum possible efficiency of a heat engine depends only on the temperatures of the hot and cold reservoirs, and is given by Carnot efficiency,  η = (T₁ - T₂)/T₁

whereT₁ is the temperature of hot reservoir, T₂ is the temperature of cold reservoir. Temperature is given in Kelvin.

The temperature difference between the hot and cold reservoirs is, T₁ - T₂ = 298.2 K - 280.2 K = 18 K

Substitute these values in the Carnot efficiency equation,

Carnot efficiency, η = (T₁ - T₂)/T₁ = (18 K)/298.2 K = 0.06039. The maximum possible efficiency for such an engine is 6.039 %.

Generalised function is given as η = (T₁ - T₂)/T₁

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Answer:

When an electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gas. The hydrogen gas is obtained at the cathode and the oxygen gas is obtained at the anode