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1. you may recall that the products of the complete combustion of a hydrocarbon are water vapor and carbon dioxide gas. write the balanced equation showing the combustion of methane. do not forget to include the states of matter of the reactants and the products. hint: methane is a gas at standard temperature and pressure. (2pts)

balanced equation:
ch4(g)+202(g) -> co2(g)+2h2o(g)

to begin the experiment, 1.65g of methane ch4 is burned in a bomb calorimeter containing 1000 grams of water. the initial temperature of water is 18.98oc. the specific heat of water is 4.184 j/g oc. the heat capacity of the calorimeter is 615 j/ oc . after the reaction the final temperature of the water is 36.38oc.

2. calculate the change in temperature, δt. show your work. (1pt)

3. calculate the heat absorbed by water. use the formula qwater = m • c • δt
show your work (2pts)

4.calculate the heat absorbed by the calorimeter. use the formula:
qcal = ccal • δt show your work. (2pts)

5. the total heat absorbed by the water and the calorimeter can be calculated by adding the heat calculated in steps 3 and 4. the amount of heat released by the reaction is equal to the amount of heat absorbed with the negative sign as this is an exothermic reaction. (2pts)
a.using the formula δh = - (qcal + qwater ) , calculate the total heat of combustion. show your work.

b. convert heat of combustion (answer from part a) from joules to kilojoules. show your work.

6. evaluate the information contained in this calculation and complete the following sentence: (2pts)

this calculation shows that burning _______ grams of methane [takes in] / [gives off] energy (choose one).

7. the molar mass of methane is 16.04 g/mol. calculate the number of moles of methane burned in the experiment. show your work. (2pts)

8. what is the experimental molar heat of combustion in kj/mol? show your work. (2pts)

9. the accepted value for the heat of combustion of methane is -890 kj/mol . explain why the experimental data might differ from the theoretical value in 2-3 complete sentences. (2pts)

10. given the formula:
% error= |(theoretical value - experimental value)/theoretical value)| x 100
calculate the percent error. show your work. (2pts)

11. a 29.7 gram piece of aluminum is sitting on a hot plate. a student accidentally left the hot plate on. the aluminum now is very hot and has to be cooled. you fill a beaker with 250 grams of water. the aluminum is placed in the water. you are curious so you place a thermometer in the beaker. the water warms from 22.3 c to 30.8 c. the c (aluminum) is 0.900 j/gc, and the c (water) is 4.18 j/gc
do you have enough information to calculate the amount of energy transferred in this situation? explain in 2-3 complete sentences. (1pt)

Answer:

163.940671 grams

Explanation:

You can view more details on each measurement unit: molecular weight of Na3PO4 or grams This compound is also known as Trisodium Phosphate. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Na3PO4, or 163.940671 grams.

The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

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Answer:

the metal gets cold and week

Explanation:

The answers include the following:

This is referred to as the largest organ in the body which has a rich network of nerves and blood vessels and is responsible for protecting the body from pathogens and other foreign bodies.

Living organisms such as humans have different skin colors and is based on the amount of the protein known as melanin present in it .The color of the skin of a chicken wing ranges from white to yellow and is attached to the subcutaneous tissue.

This type of tissue is responsible for connecting the skin to the muscles and bones which are present in the body so as to perform functions necessary for the survival of the animal.

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Answer:

1. SUBSTANCE A IS SOLUBLE IN WATER WHILE SUBSTANCE B IS INSOLUBLE IN WATER.

Looking at the information given in the question about the two substance, you will discover that 60 g of both substances were initially put in the beaker. While the mass of undissolved substance for substance A is variable, that of substance B remain constant at 60 g, this shows that the substance is not soluble in water.

2. Looking at the two substances given in the question, you will observe that for substance A, the degree of solubility in water decreases as the temperature of the water increases. For instance, at 20 degree Celsius, the mass of undissolved substance is 5 and as the temperature increases to 40, 60 and 80 degree Celsius, the mass of undissolved substances also increase to 10, 14 and 18 respectively. This shows that, the higher the temperature, the less of the substance will dissolve. For substance B, the mass of undissolved substance remain constant at all temperatures, which shows that the substance is insoluble in water. Thus, the data given helps to determine the solubility of the substance by giving the amount of substances that are insoluble at each temperature.

Explanation:

Answer:

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Explanation:

Triglycerides are esters of glycerol and three fatty acids. The correct option is (b) glycerol and three fatty acids.

Triglycerides, also known as triacylglycerols, are the main type of fat found in both animals and plants. They are composed of three fatty acid molecules bonded to a glycerol molecule through ester linkages. The esterification reaction occurs between the hydroxyl groups of glycerol and the carboxyl groups of the fatty acids.

The fatty acids in triglycerides can vary in length, saturation, and position of double bonds, giving rise to a wide range of triglyceride species with different physical and chemical properties. Common examples of fatty acids found in triglycerides include palmitic acid, oleic acid, and stearic acid.

Palmitic acid is a saturated fatty acid, while oleic acid is a monounsaturated fatty acid. By combining these fatty acids with glycerol, along with another fatty acid, a triglyceride is formed. This esterification process results in the formation of a glycerol backbone with three fatty acid chains attached, forming the triglyceride molecule.

Therefore, option (b) palmitic acid, oleic acid, and glycerol is the correct choice, representing the esters found in triglycerides.

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Answer:

there is rainbow after the rain goes away because there is sun in the sky and that's why there is rainbow in the sky

Explanation:

Explanation:

Rainbow is formed due to dispersion of sunlight by tiny water droplets suspended in the atmosphere after a rain shower .....After rain shower the sun is visible to us again and the rain water droplets are suspended in the atmosphere therefore they disappear sunlight and and rainbow is formed

The gas pressure after compressing the sample from 8.00 L to 2.00 L at constant temperature is 16.0 atm.

To find the gas pressure after compression, we can use Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume at a constant temperature.

Boyle's Law can be expressed as:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, respectively, and P2 and V2 are the final pressure and volume, respectively.

Given:

Initial pressure (P1) = 4.00 atm

Initial volume (V1) = 8.00 L

Final volume (V2) = 2.00 L

Let's substitute these values into Boyle's Law:

P1V1 = P2V2

4.00 atm * 8.00 L = P2 * 2.00 L

32.00 atm * L = 2P2 * L

32.00 atm = 2P2

Dividing both sides by 2:

16.00 atm = P2

Therefore, the gas pressure after compression is 16.0 atm.

The gas pressure after compressing the sample from 8.00 L to 2.00 L at constant temperature is 16.0 atm.

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Answer:

diple doble

Explanation:

The concept molarity is used here to determine the grams of potassium nitrate required. It is an important method which is used to calculate the concentration of a solution. Here the mass of KNO₃ is 8.088 g.

The concept molarity is defined as the number of moles of the solute dissolved per liter of the solution. It is represented as 'M' and its unit is mol / L.

1. Molarity = Number of moles / Volume of solution in liters

n = 0.40 × 0.1 = 0.04

The ratio of  K₂CrO₄ to KNO₃ is 1:2

Moles of KNO₃ = 2 × 0.04 = 0.08

Molar mass of KNO₃ = 101.10 g / mol

Mass =  0.08 × 101.10 = 8.088 g

2. Moles = 0.40 × 0.1 = 0.04

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Salt carried by a stream is a great example of a dissolved load.

When referring to stream or river loads, there are three main types: dissolved load, suspended load, and bed load. The dissolved load consists of materials that are dissolved in the water, such as ions and minerals. These dissolved particles are not visible and remain in solution, giving the water its characteristic composition.

In the case of salt carried by a stream, it refers to the presence of dissolved salts, particularly sodium chloride (NaCl), in the water. The salt dissolves in the stream water, and as the water flows downstream, it carries the dissolved salt along with it. This dissolved load of salt is not visible and is evenly distributed within the stream water.

Dissolved loads are often influenced by factors such as weathering, groundwater input, and human activities. They play a crucial role in the chemical composition of streams and rivers, impacting water quality and ecosystem dynamics.

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Answer:

H2SO4 + 2NaNO2 → HNO2 + Na2SO4

The balanced equation for the breakdown of sulfuric acid and sodium nitrate is:

H2SO4 + 2NaNO2 -> HNO2 + Na2SO4

This equation shows that for every one molecule of sulfuric acid (H2SO4), two molecules of sodium nitrate (NaNO2) are required to produce one molecule of nitrous acid (HNO2) and one molecule of sodium sulfate (Na2SO4).

In terms of mass, the equation shows that for every 588 grams of sulfuric acid, 828 grams of sodium nitrate are required to produce 564 grams of nitrous acid and 384 grams of sodium sulfate.

The electron configuration [kr]4d10 represents the atomic configuration of the element, which has 36 electrons in total. It is specifically the configuration of the noble gas krypton, which has the atomic number of 36.

The electron configuration of an atom is the number of electrons that it has in its orbitals. Orbitals are the areas around the atom's nucleus where electrons are most likely to be found. There are a variety of different orbitals, with varying energy levels and subshells. The electron configuration of an element is a concise way to represent its electronic configuration and to predict its chemical behavior.

In the case of the electron configuration [kr]4d10, the first part, [kr], indicates the configuration of the noble gas krypton, which has 36 electrons and a full outer shell. The second part, 4d10, indicates that there are 10 electrons in the d subshell of the fourth energy level. This configuration is specifically associated with the element with an atomic number of 46.

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Answer:

610.1

Explanation:

When we add or subtract the values, the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.

In given values 377.1 has only decimal place thus in result after decimal there should be one digit only.

987.22 - 377.1 = 610.1

When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.

Now we will calculate the difference between 7.69 and 4.0.

7.69 - 4.0 = 3.69

In given values 4.0 have less number of significant figures thus result must have only two significant figures . So we would round the result.

3.7

Answer:

EtOH stands for ethyl alcohol, which is the type of alcohol found in alcoholic beverages such as beer, wine, and spirits. It is a central nervous system depressant that can cause a range of effects, from mild relaxation to severe impairment of cognitive and motor functions. EtOH is often used in the medical and research fields as a short notation for Ethanol.

EtOH is the chemical label or acronym for ethyl alcohol (ethanol). EtOH refers to the kind of alcohol that can be found in alcoholic beverages like wine, beer, and spirits.

It is a depressant of the central nervous system that can have a variety of effects, ranging from mild relaxation to severe cognitive and motor impairment. In the medical and research industries, EtOH is frequently used as a short notation for ethanol.

It is used in the production of other chemicals, as a solvent, and in alcoholic beverages. Ethanol is a colorless, somewhat toxic substance. Solutions of ethanol and water that contain more than 50% ethanol are extremely flammable. The most well-known use of ethanol is as alcohol in alcoholic beverages.

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Answer:  P2 = 0.858 atm

Explanation:

Use the combined gas law:  P1V1/T1 = P2V2/T2,

where the subscripts are the initial (1) and final (2) states.  Temperature must be in Kelvin.  We want P2, so rearrange the equation to solve for P2:

P2 = P1(V1/V2)(T2/T1)

Note how I've arranged the volume and temperature values:  as ratios.  Now it is easy to cancel units and see what is going to happen to the pressure if we lower the temperature.  Since the pressure change is a function of (T2/T1), and we are lowering the temperature (T2), we'd expect this to decrease the pressure.

No information is given on volume, so we'll assume a convenient value of 1 liter.  Now enter the data:

P2 = (0.917atm)*(1)*(322K/344K)

P2 = 0.858 atm

Answer:

you need my help come over

Explanation:

Explanation:

Plastic takes time to degrade which means it has great longevity. Plastic does not break as easily as glass or other materials. It lasts long and offers great service. Plastic storage containers offer greater flexibility than any other packaging materials.

The molarity of the calcium hydroxide solution used in the experiment is 0.0848 M. By determining the number of moles of potassium hydrogen phthalate from its mass, using stoichiometry the number of moles of calcium hydroxide, and then dividing the number of moles by the volume of the solution.

The balanced chemical equation for the reaction between calcium hydroxide (Ca(OH)₂) and potassium hydrogen phthalate (KHC₈H₄O₄) is:

Ca(OH)₂ + 2KHC₈H₄O₄ → Ca(C₈H₄O₄)₂ + 2H₂O

From the equation, we can see that one mole of calcium hydroxide reacts with two moles of potassium hydrogen phthalate.

Volume of calcium hydroxide solution = 26.42 mL = 0.02642 L

Mass of potassium hydrogen phthalate = 0.914 g

The molarity of the calcium hydroxide solution, we need to determine the number of moles of potassium hydrogen phthalate.

Calculate the number of moles of potassium hydrogen phthalate:

Molar mass of potassium hydrogen phthalate (KHC₈H₄O₄) = 204.23 g/mol

Number of moles of KHC₈H₄O₄ = Mass of KHC₈H₄O₄ / Molar mass of KHC₈H₄O₄

Number of moles of KHC₈H₄O₄ = 0.914 g / 204.23 g/mol

Number of moles of KHC₈H₄O₄ = 0.004478 mol

Use stoichiometry to determine the number of moles of calcium hydroxide:

From the balanced equation, we know that the mole ratio between calcium hydroxide and potassium hydrogen phthalate is 1:2.

Number of moles of Ca(OH)₂ = (1/2) * Number of moles of KHC₈H₄O₄

Number of moles of Ca(OH)₂ = (1/2) * 0.004478 mol

Number of moles of Ca(OH)₂ = 0.002239 mol

The molarity of the calcium hydroxide solution:

Molarity (M) = Number of moles / Volume (in L)

Molarity of Ca(OH)₂ solution = 0.002239 mol / 0.02642 L

Molarity of Ca(OH)₂ solution = 0.0848 M

Therefore, the molarity of the calcium hydroxide solution is 0.0848 M.

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Due to electronegativity difference between H and F atom.

Thus from the above conclusion we can say the difference in electronegativity between H and F atom this is the reason for shorter bond length of HF.

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This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

 You can convert the number of quarts to liters using the conversion factor in order to determine the number of milliliters in a family pool that contains 25,000 quarts of water. 0.25 liters are contained in 1 quart.

This means that 6,250 liters are equal to 25,000 quarts, or 25,000 * 0.25.

The conversion factor can then be used to convert liters to milliliters. Milliliters are equivalent to one liter. Accordingly, 6,250 liters are equivalent to 6,250 * 1,000, or 6,250,000 milliliters.

This quantity may be expressed in scientific notation as 6.25 x 106 milliliters.

It is frequently used to convey extremely big or extremely small values. In this instance, scientific notation enables us to express the volume of the family pool in a more condensed and readable manner.

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In nucleophilic aromatic substitution, the attacking species (the nucleophile) necessarily is the nucleophilic aromatic ring in this type of context.

This is defined as a substitution reaction which involves the nucleophile displacing a good leaving group, such as a halide etc.

This type of reaction attacks it through series of reactions and processes and a good example are compounds which belong to the amine group.

This is therefore the reason why nucleophilic aromatic ring was chosen as the most appropriate choice.

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Explanation:

the equation must be

4NH3 + 5O2–> 4NO + 6H2O

Answer:

I think the answer is (B)

A coffee cup temperature  with a heat capacity of 6. 70 J/∘ C was used to measure the change in enthalpy of a precipitation reaction.The value of ΔHrxn was found to be 61.9 kJ/mol.

Calculate the enthalpy of reaction, ΔHrxn, per mole of precipitate formed (AgSCN). Assume the specific heat of the product solution is 4. 11 J / (g⋅∘C) and that the density of both the reactant solutions is 1. 00 g/mL.1. Calculation of Moles of precipitate formed from AgNO3:To find the value of ΔHrxn, we used the formula ΔHrxn = Qsolution/n, where Qsolution is the heat change produced by the solution process and n is the number of moles of AgSCN formed.

To find the value of n, we first calculated the number of moles of AgNO3 and KSCN used in the reaction using the formula n = M × V.To find the heat change produced by the solution process, we used the formula

Q = m × c × ∆T,

where Q is the heat change, m is the mass of the product solution, c is the specific heat capacity of the product solution, and ∆T is the change in temperature of the solution.The value of ΔHrxn was found to be 61.9 kJ/mol.

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Type II alveolar cells are critical for maintaining the structure and function of the alveoli and for ensuring efficient gas exchange in the lungs.

The walls of the alveoli in the lungs are composed of two main types of cells, type I and type II alveolar cells. Type II alveolar cells, also known as septal cells or Type II pneumocytes, have several important functions in the lungs, including:

Production of surfactant: Type II alveolar cells secrete a substance called surfactant, which helps to reduce surface tension in the alveoli and prevent their collapse during exhalation. This is crucial for maintaining efficient gas exchange in the lungs.

Stem cell function: Type II alveolar cells are also thought to act as stem cells in the lungs, helping to regenerate damaged or injured lung tissue.

Immune function: Type II alveolar cells can also act as immune cells in the lungs, playing a role in the body's defense against pathogens and other foreign substances.

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The statement that is true concerning ideal gases is:

"A gas exerts pressure as a result of the collisions of the gas molecules with the wall of the container."

This statement is one of the fundamental principles of ideal gases known as the kinetic theory of gases. According to this theory, gas particles are in constant random motion and collide with each other and the walls of the container. These collisions result in the exertion of pressure by the gas.

The other statements are not true for ideal gases:

The gas particles in a sample do not exert attraction for one another. Ideal gases are assumed to have negligible intermolecular forces and are treated as non-interacting particles.

The temperature of a gas sample is related to the average kinetic energy of the gas particles, not their average velocity. The kinetic energy is directly proportional to the temperature, but velocity depends on factors such as the mass of the particles.

The statement about the comparison of 10 L of Ar to 1.0 L of Ne is not accurate. The number of atoms in a gas sample is determined by Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain the same number of particles (atoms or molecules), regardless of their molar masses.

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The Texas Bill of Rights provides protections reactant to individuals who have been charged with crimes, and one of these protections is that no one can be charged with a felony crime unless first being charged by a grand jury. ,

The correct answer is a) grand jury.

This means that a group of citizens, typically 12-23 individuals, must hear evidence presented by a prosecutor and determine if there is enough probable cause to indict the accused person. This requirement is designed to protect individuals from being unjustly charged with serious crimes without sufficient evidence and provides a check on the power of the prosecutor.

The Texas Bill of Rights extends protections to those who have been charged with crimes, ensuring that no one can be charged with a felony crime without first being charged by a grand jury. This process provides an additional layer of protection for the accused and helps maintain a fair judicial system.

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