2. A Snickers bar is burned in a bomb calorimeter containing 3500 grams of water causing a
72°C temperature change. How many joules are there in a bar?
Answers
The Snickers bar released 1,077,280 joules of energy when burned.
To calculate the energy released by burning a Snickers bar, we can use the formula:
q = mcΔT
where q is the heat energy released, m is the mass of water, c is the specific heat of water, and ΔT is the temperature change.
We know the mass of water is 3500 g, and the temperature change is 72°C. The specific heat of water is 4.184 J/g°C.
Therefore:
q = (3500 g) x (4.184 J/g°C) x (72°C) = 1077280 J
So, the Snickers bar released 1,077,280 joules of energy when burned.
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Related Questions
the force that one surface exerts on another when the two rub against each other is called _
Answers
Answer:
friction
Explanation:
from the gc data, assign the signals to 2-methyl-2-butene and 2-methyl-1-butene. how were the assignments made?
Answers
A GC-MS produces muti data, including chromatograms for quantitative and qualitative analysis, mass spectra for confirming identity, identifying unknown analytes, and determining the structural and chemical properties of molecules.
What do you discover with GC-MS data?The GCMS uses a standard, or a proportion of the component that has already been established and has also been measured on the GCMS, to quantify the concentration of each chemical in a sample.
On a chart known as a chromatogram, a peak for each substance that the GC separates is used to symbolize it. The number of peaks reflects the sample's concentration of separated components. Each peak's location reveals the retention time of the compound.
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57.1% carbon, 6.16% hydrogen, 9.52% nitrogen, and 27.18% oxygen
Answers
what is the correct numerical setup for calculating the volume of h2(g)
Answers
The correct numerical setup for calculating the volume of H₂(g) is to use the ideal gas law equation: PV=nRT.
To calculate the volume of a gas, we can use the ideal gas law equation, which relates the pressure, volume, amount of gas, and temperature of a gas. The equation is PV=nRT, where P is the pressure in atmospheres (atm), V is the volume in liters (L), n is the number of moles of gas, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin (K).
For H₂ gas, we would need to know the pressure, temperature, and amount of gas present. If we have those values, we can rearrange the equation to solve for the volume of gas. It's important to note that this equation assumes ideal gas behavior, which may not be the case in all situations. Additionally, the units of pressure and temperature must be in the correct SI units for the equation to work.
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In one or two sentences, explain why the combined weight of several liquids mixed in an open flask can be less than but never more than the sum of all the weights of the ingredients.
Answers
Answer: The law of conservation of mass states that mass is neither created or destroyed, so the combined mass of all the products after the reaction will be the same as the mass of all the reactants and never more, but since the flask is not closed, the gases produced from the reaction will move into the atmosphere and the product left behind , the solids and/or liquids, will be the only products that you’ll end up weighing, meaning it’ll be less weight than the original reactants. The reason I’m interchanging weight and mass is because although weight changes with gravity, so long as the gravitational force stays constant throughout the experiment, it’s pretty much the same.
Explanation:
If you have 20 grams of carbon-14 and it goes through 2 half lives, how much carbon-14 is left?
Answers
Answer:
it would be 25% sorry if I'm wrong
Why are many drugs administered as salts rather than as the corresponding neutral compounds?
A. Salts have greater water solubility and stability than the neutral compound.
B. As a general rule, salts are more active than the neutral compounds.
C. Salts are generally liquid and therefore more active than the neutral compounds.
D. The salts are less expensive to produce than the corresponding neutral compounds.
Answers
When a drug is administered as a salt, it is typically combined with an appropriate counterion to form a salt form of the drug. This salt form enhances the solubility of the drug in aqueous solutions, which can improve its bioavailability and allow for better dissolution and absorption in the body.
The correct answer is Many drugs are administered as salts rather than as the corresponding neutral compounds because salts often have greater water solubility and stability. This is important for effective delivery and absorption of the drug in the body. Furthermore, salts often provide improved stability compared to the corresponding neutral compounds. The addition of counterions in the salt form can enhance the chemical and physical stability of the drug molecule, protecting it from degradation or hydrolysis.
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do not delete i just need help
Answers
Answer:
A. prokaryotic cell
Explanation:
We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.
What strategy should be done to provide quality education without discrimination?
Answers
Explanation:
The Committee has already adopted general comment No. ... Non-discrimination - education must be accessible to all, especially the most ... developmental strategy for its school system.as poverty and discrimination and to provide education of sufficient quality, in a manner that ensures children can benefit from it.
when a large amount of glucose is present benedicts turns
Answers
Answer: When glucose is mixed with Benedict's reagent and heated, a reduction reaction causes the Benedict's reagent to change color. The color varies from green to dark red (brick) or rusty-brown, depending on the amount of and type of sugar. Glucose never gives violet colour precipitate with Benedict's solution.
Explanation:
According to Boyle's Law, the pressure of a gas increases as the volume decreases because the gas particles strike the walls of the container with more force. the kinetic energy of the gas particles increases. the temperature of the gas increases. the gas particles strike the walls of the container more often. the gas particles get bigger
Answers
Boyle's Law states that as the volume of a gas decreases, the pressure of the gas increases. This is because the gas particles are confined to a smaller space, and therefore strike the walls of the container with more force.
The kinetic energy of the gas particles does not necessarily increase, but rather stays constant as long as the temperature remains constant. The temperature of the gas does not increase, but rather decreases if the volume decreases while the pressure increases. The gas particles do strike the walls of the container more often as the volume decreases. However, the size of the gas particles does not change as the volume decreases, so this is not a factor in Boyle's Law.
According to Boyle's Law, the pressure of a gas increases as the volume decreases because the gas particles strike the walls of the container more often. This law states that for a given quantity of gas at a constant temperature, the pressure and volume of the gas are inversely proportional. As the volume of the container decreases, the gas particles have less space to move, resulting in more frequent collisions with the container walls, thus increasing the pressure.
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Which energy source is considered nonrenewable?
1) moving water
2) fossil fuel
3) wind
4) biomass
Answers
Answer:
Fossil fuel
Explanation:
Answer:
2
Explanation:
Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.
how are priorities assigned to each group bonded to a tetrahedral stereogenic center? (select all that apply.)
Answers
A tetrahedral stereogenic center is a specific carbon atom bonded to four different groups. Priorities can be assigned to each group bonded to a tetrahedral stereogenic center based on the Cahn–Ingold–Prelog (CIP) sequence rule.
A tetrahedral stereogenic center is a specific carbon atom bonded to four different groups. Priorities can be assigned to each group bonded to a tetrahedral stereogenic center based on the Cahn–Ingold–Prelog (CIP) sequence rule. The Cahn–Ingold–Prelog (CIP) sequence rule is based on a set of priority rules for atoms or groups of atoms that are bonded to a stereocenter. This rule assigns R and S stereochemical descriptors to each chiral center. The group with the highest atomic number is given the highest priority, and the group with the lowest atomic number is given the lowest priority.
When assigning priorities to a tetrahedral stereogenic center, the following guidelines should be followed: The group attached to the stereocenter should be assigned the highest priority, followed by the next-highest priority group, and so on. The lowest priority group should be assigned to the fourth group. According to the CIP sequence rule, the atoms or groups of atoms attached to the tetrahedral carbon atom are assigned priorities based on their atomic numbers. The group with the highest atomic number is given the highest priority, and the group with the lowest atomic number is given the lowest priority. Thus, priorities assigned to each group bonded to a tetrahedral stereogenic center are based on the Cahn–Ingold–Prelog (CIP) sequence rule.
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18. The specific gravity of a liquid:
a. is measured in g/cm'.
b. can be determined with a hydrometer.
c. is the ratio of mass to density of a liquid.
d. all of the above.
Answers
what is the first thing you do in any conversion question?
Answers
Answer:
You confirm the units involved, which would make you to understand the factors required.
Explanation:
Conversion of units is a process in which a given unit of a physical quantity is accurately transformed into another. Example, when the mass of a substance in grams is converted to kilograms. Or conversion of a given quantity of substance from liters to gallons.
When conversion is required, the first thing to do is to determine the units involved. That is, which unit do you want to convert to the required unit. This would give the understanding of the factors that are needed.
A scuba diver swims deeper and deeper into the ocean. What happens to the nitrogen in her blood as she goes deeper
Answers
Answer:
it compresses under the pressure.
Explanation:
when she comes up, it will re-expand as pressure goes down- this is why they have to be very careful how fast they come back up.
Answer:
If a diver goes through too great of pressure change too quickly, their body cannot eliminate all of the expanding nitrogen and the excess nitrogen forms bubbles in their tissues and blood. These nitrogen bubbles can cause decompression sickness (DCS) by blocking blood flow to various parts of the body, causing strokes, paralysis, and other life-threatening problems.
When table salt (sodium chloride which ionizes into Na and Cl ) is added to alginate, a geldoes not form and spherification does not occur. This happens because:L.✓Alginate requires a doubly charged cation to crosslinkM. The salt is negatively charged and repels the alginateN.The alginate is a doubly charged anionO.✓The salt only has one positive charge that neutralizes the negative charge in thealginate
Answers
When table salt (sodium chloride which ionizes into Na and Cl) is added to alginate, a gel does not form and spherification does not occur. This happens because the salt only has one positive charge that neutralizes the negative charge in the alginate.
There are various types of Spherification. Spherification is the creation of small spheres with a thin film on the surface and a liquid center. The process of spherification is mostly used in molecular gastronomy to make small, flavorful balls of liquid ingredients that burst in the mouth when bitten into. The method involves a process of encapsulating liquid droplets in a sphere made of a gel-like film. This process requires sodium alginate (E401), a gel-forming ingredient that thickens the liquids.
Sodium alginate gelation occurs as a result of the mixture of an alginate solution with a cation solution that causes the solution to gel. The sodium ions present in the solution swap with calcium ions present in the cation solution, causing a gel to form. This occurs as a result of a chemical reaction known as cross-linking. When table salt is added to the alginate solution, a gel does not form and spherification does not occur since the salt only has one positive charge that neutralizes the negative charge in the alginate. Alginate requires a doubly charged cation to cross-link.
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if a disaccharide such as lactose tested positive using benedict’s test, what would that tell you about the position of the carbonyl functional group in the ring structure?
Answers
If a disaccharide such as lactose tested positive using Benedict's test, it would indicate that the carbonyl functional group is present in the reducing sugar form of the disaccharide. In lactose, the carbonyl group is located in the glucose unit of the molecule.
Benedict's test is used to detect the presence of reducing sugars, which are sugars capable of reducing the copper(II) ions in the Benedict's reagent to form a red precipitate of copper(I) oxide. This reaction occurs when the carbonyl group of the sugar undergoes oxidation. Since lactose contains a carbonyl group in the glucose unit, it can undergo oxidation and produce a positive result in the Benedict's test.
In conclusion, if lactose tests positive in the Benedict's test, it indicates that the carbonyl functional group is present in the glucose unit of the lactose molecule.
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Which orbital is portrayed on the right?
Answers
A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.
What's the appearance of the p orbital?A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.Each shell can only carry a certain amount of electrons: the first shell can hold two electrons, the second shell can hold eight electrons (2 + 6) and so on, the third shell can hold 18 electrons (2 + 6 + 10).To learn more about orbital refer to:
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The formula of the iron oxide is fe2o3.
calculate the maximum mass of iron that can be obtained from 240 tonnes of iron oxide, fe2o3.
(relative atomic masses: o = 16, fe = 56)
Answers
Answer:
here down below is the anwser
Explanation:
Iron (III) oxide can be produced by the reaction shown in this equation:
2Fe +3C2 (arrow) 2FeCl3
Calculate the maximum mass of Iron (III) chloride that can be produced from 11.20 grams of iron?
Relative atomic masses: Cl= 35.5 , Fe =56
Which of the following is an empirical formula?A.) P4O10B.) C2H4C.) H2O2D.) N2O
Answers
Answer:
N2O is an empirical formula
Explanation:
A.) P4O10 NO: Can be reduced to P2O5
B.) C2H4 NO: Can be reduced to CH2
C.) H2O2 NO: Can be reduced to H O
D.) N2O YES, the formula cannot be reduced any further.
what advice would you give to your friend who has been suffering from domestic violence
Answers
Answer:
the advices are,
1. i would say him or her to give all information about not to do domestic violence who has doing it.
2. i would say him/ herto be strict towards the domestic violence.
3. i would suggest him or her to raise voice aganist towards the domestic violence.
5. i would suggest him or her to negotiate to them for theirbasic rights.
6. if its not possible then i would suggest him or her to complain to the police.
hope u like it ...
Answer: If my friend has been suffering from domestic violence, then I will advice her to be strict towards domestic violence, believe in yourself, don't lose hope, provide the information about not doing domestic violence for who has doing it, I will suggest her to raise voice against it, to fight for the basic rights, If not possible then i would advice her to complain to police and if it is even worst then I will advice her to leave as soon as possible, make your own decision, etc These advice i would give if my friend has been suffering from domestic violence.
Explanation:
Hope it will help you...................
Calculate the amount of pure CaCO3 that could theoretically neutralize the H+ in one-year acid rain if a 1-hectare site received 1400 mm of rain per year and the average pH of the rain was 5.5
Answers
The approximately 2.212 kg of pure CaCO3 would be needed to neutralize the H+ in one year of acid rain on a 1-hectare site that received 1400 mm of rain per year with an average pH of 5.5.
How we can approximately CaCO3 neutralize H+ of rain per year with an average pH of 5.5.?To calculate the amount of pure CaCO3 needed to neutralize the H+ in one year of acid rain, we can use the following steps:
Calculate the total volume of water that falls on 1 hectare site in one year.1 hectare = 10,000 square metersTotal volume of rain = area x rainfallTotal volume of rain on 1 hectare = 10,000 m² x 1400 mmTotal volume of rain on 1 hectare = 14,000,000 liters or 14,000 m³Calculate the number of moles of H+ ions in the acid rain.pH is a logarithmic scale, so pH 5.5 means [H+] = 3.16 x 10⁻⁶ MNumber of moles of H+ ions in 14,000 m³ of rain = volume x concentrationNumber of moles of H+ ions in 14,000 m³ of rain = 14,000,000 L x 3.16 x 10⁻⁶ mol/LNumber of moles of H+ ions in 14,000 m³ of rain = 44.24 molesCalculate the amount of CaCO3 needed to neutralize the H+ ions.The balanced chemical equation for the reaction between CaCO3 and H+ is:CaCO3 + 2H+ → Ca2+ + CO2 + H2O
One mole of CaCO3 can neutralize 2 moles of H+ ions.Therefore, the amount of CaCO3 needed to neutralize 44.24 moles of H+ ions is:44.24 moles H+ x 1 mole CaCO3/2 moles H+ = 22.12 moles CaCO3Calculate the mass of CaCO3 needed to neutralize the H+ ions.The molar mass of CaCO3 is 100.09 g/mol.Therefore, the mass of CaCO3 needed to neutralize 22.12 moles of H+ ions is:22.12 moles CaCO3 x 100.09 g/mol = 2,212 g or 2.212 kgTherefore, approximately 2.212 kg of pure CaCO3 would be needed to neutralize the H+ in one year of acid rain on a 1-hectare site that received 1400 mm of rain per year with an average pH of 5.5.
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How many grams of sodium hydroxide are required to prepare a 200 ml solution of a 10% (weight per volume) solution? (Atomic weights: Na = 23; 0 = 16; H = 1)
Answers
Given that we want to prepare a 10% solution of sodium hydroxide in 200 mL, we need to calculate the mass of sodium hydroxide required to make this solution.
We can use the following formula to calculate the mass of solute required to make a given volume and concentration of solution:
mass of solute = volume of solution x concentration of solution x density of soluteFirst, let's calculate the density of sodium hydroxide.The density of solid NaOH is 2.13 g/mL. So, the density of sodium hydroxide solution is:
Density = 2.13 g/mLNow, let's substitute the given values into the formula to calculate the mass of sodium hydroxide required:mass of solute = 200 mL x 0.10 x 2.13 g/mL= 4.26 gTherefore, 4.26 grams of sodium hydroxide are required to prepare a 200 mL solution of a 10% (weight per volume) solution.About Sodium hydroxideSodium hydroxide, also known as lye and caustic soda or caustic soda, is an inorganic compound with the chemical formula NaOH. This compound is an ionic compound in the form of a white solid composed of the sodium cation Na⁺ and the hydroxide anion OH⁻. Sodium hydroxide is a building block that can also be found in detergents and oil stain removers. We use it to make products clean better by influencing the formula molecules, so they work better together.
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How can the direction that the Moon rotates and revolves be described?
A. Diagonally
B. Horizontally
C. Clockwise
D. Counterclockwise
Answers
Answer: Counter-Clockwise.
Explanation: Please brainliest. I'm almost next tier.
What advice would you give to the company that wants to build an L-shaped building in Tokyo?
Answers
The surrounding environment should be taken into account, the relevant permissions should be obtained, and building codes, earthquake safety standards, and energy efficiency recommendations should be followed.
What is the price of constructing a home in Japan?Simple reinforced-concrete homes can cost as much as 450,000 Yen/sqm to build, compared to a simple wood-framed home's typical cost of 200,000 Yen/sqm.
Can I build a house on my own in Japan?Foreigners are permitted to own homes and property for any reason, and the tax rate for land purchases is the same as that of all Japanese citizens. You can purchase either vacant land or an existing home or flat.
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What does the photoelectric effect prove?
Please don't copy a random answer off the internet.....
Answers
Answer:
By showing that changing the frequency of light causes the emission of faster electrons.
Explanation:
The photoelectric effect happens when light strikes a metal surface causing the emission of electrons from it (photoelectrons).
If you increase the intensity of the light you get, as acresult, more electrons emitted but their kinetic energy does not increase.
If you increase the frequency of the incident light the number of photoelectrons emitted does not increase while the velocity, and so their kinetic energy, increases...the emitted electrons are more...energetic!
This can be explained considering the incident light as a shower of particle-like packets of energy (photons); if you increase the intensity you simply increase the number of packets (all with the same energy) hitting the metal; these can be used by a lot of electrons to escape.
On the other hand if you increase the frequency the number of packets remains the same (emitting fewer electrons perhaps) but the energy carried by each of them increases.
Each packet carries an energy directly proportional to the frequency.
chemical composition of the gas in LPG cylinder??
Answers
LPG is composed hydrocarbons containing three or four carbon atoms. The normal components of LPG thus, are propane (C3H8) and butane (C4H10). Small concentrations of other hydrocarbons may also be present.
. explain why s8 contains subgroups isomorphic to z15, u(16), and d8 .
Answers
Sulfur (S8) contains subgroups isomorphic to Z15, U(16), and D8 because it has a highly symmetric structure with multiple planes of reflection and rotation.
The S8 molecule has a ring structure with eight sulfur atoms arranged in a crown-like shape. Each sulfur atom forms two covalent bonds with neighboring sulfur atoms, forming a stable ring structure. This structure exhibits a high degree of symmetry, with multiple planes of reflection and rotation.
Due to its symmetry, the S8 molecule has subgroups that are isomorphic to Z15, U(16), and D8, which are mathematical groups that describe different types of symmetry. The Z15 subgroup describes the 15-fold symmetry of the S8 molecule, while the U(16) and D8 subgroups describe the rotational and reflectional symmetries of the molecule, respectively.
Understanding the symmetry properties of molecules is essential in chemistry and materials science, as it can provide insights into their physical and chemical properties. The symmetry of S8 makes it an interesting molecule to study, and its various subgroups offer a rich source of information about its structure and behavior.
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what is the mean of 98,99, 100 90 , 98,100
Answers
The given question is 98, 99, 100 , 90, 98 , 100
Mean= \(\frac{Sum of observations}{Number of observations}\)
In mathematics and statistics, the average is the average of a set of values. The mean can be calculated in a number of ways, including the simple arithmetic mean (adding the numbers and dividing the sum by the number of observations), the geometric mean, or the harmonic mean.
Sum of observations is 98+99+100+90+98+100
The summation is 585
The number of observations is 6.
= \(\frac{98+99+100+90+98+100}{6}\)
= 97.5
So, the answer is 97.5