Answers
Answer: To counterbalance the negative charge on the electrons.
Explanation:
The plum pudding model
Thomson knew that atoms had an overall neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom
Thomson found that the path taken by the cathode ray could be bent towards a positive metal plate, and away from a negative metal plate. As a result, he reasoned that the particles in the cathode ray were negative.
: )
Related Questions
The rope was long and stringy. * Qualitative Or quantitative
Answers
Answer:
Quantitative
Explanation:
quantitative is example of measuring length
Which factor is a biotic factor of an ecosystem?
Answers
Answer:
what are your choices
Explanation:
because I can help you
Answer: the bacteria that live in the intestine of a rabbit
Explanation:
thats the answer if ur quiz/test is same as mine
I need help with this question.
Answers
The London forces designated as A are much weaker than the dipole- dipole interaction designated as B.
The intermolecular forces are interactions that exists between molecules of a substance in a particular state of matter. The nature of intermolecular forces in a substance greatly affect the properties of the substance.
We can see that A represents weak London forces while B represents dipole - dipole interactions. The London forces are very much weaker than the dipole - dipole interactions.
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Explain why the upper phase, after reflux, contained the 1-bromopentane, even though its expected density is 1.276 g/cm3, and the density of water is ~1.00 g/cm3. Think what is in the aqueous solution (e.g., what is the density of salt water
Answers
Answer:
The water is not pure i.e. It contains some hydroxide and bromobutane ions that is why the upper phase contains 1-bromopentane
Explanation:
The upper phase after reflux will contain 1-bromopentane even when its density is 1.276g/cm^3 because even though the density of water = 1.00g?cm^3 the water is not pure i.e. It contains some hydroxide and bromobutane ions making it to stay at the bottom while 1- bromobutane stays at the upper phase
Consider the following three materials: • Compressed natural gas pressurized to 250 bar has a mass energy density of 53.6 MJ/kg (sometimes called a specific energy) and a volume energy density of 9 MJ/Liter. The weight of storage tanks for compressed natural gas varies significantly with cost (lighter being more expensive), but a reasonable estimate for a tank costing a few thousand dollars is 40 kg (empty) for a tank that holds about 250 liters. • Hydrogen pressurized to 300 bar has a mass energy density of 142 MJ/kg and a volume energy density of 2.4 MJ/Liter. As for compressed natural gas, the weight of storage tanks varies with cost, but a storage tank that costs a few thousand dollars and contains 320 liters of hydrogen pressurized to 300 bar has a mass of about 90 kg (empty). • Gasoline is a liquid at room temperature and pressure, and has a mass energy density of 46 MJ/kg and a volume energy density of 34.2 MJ/Liter. An empty gasoline tank on an average car has a mass of around 12 kg and costs about $100. You may assume that a standard automotive gasoline tank for the car you are designing will have a capacity of 18 gallons, or about 68 Liters. You want to design a car that will operate on one of these fuel sources, which means that the car must be able to carry the fuel needed to travel 300 miles at an average speed of 60 miles per hour. One measure of automotive performance is a power to weight ratio, and while this number varies by a factor of two or more depending on the performance (e.g., sports cars versus a Toyota Prius), an approximate average number is 80 Watts/kg. Assume the weight of the car, minus the fuel storage tank(s), is 1500 kg, and assume that the cost of the new car is intended to be about $25,000 plus whatever the cost of the fuel storage container(s) will be. Ignoring all external factors such as the cost of the fuel, the availability of an appropriate distribution system and filling stations for each fuel, and any possible differences in efficiency or environment effects from using different fuels, provide an analysis of the tradeoffs of each of these fuels for this transportation application. Can you make a recommendation as to which would be best?
Answers
To analyze the tradeoffs of each fuel for this transportation application, we need to compare the energy density, weight, and cost of each fuel and its storage system. We also need to consider the power-to-weight ratio of the car, which determines its performance.
Compressed natural gas has a low energy density, both in terms of mass and volume, compared to gasoline and hydrogen. It requires a large and heavy storage tank to carry enough fuel for a 300-mile journey, which will increase the weight of the car and decrease its power-to-weight ratio. The cost of the storage tank is relatively low compared to hydrogen, but still significant, and the availability of compressed natural gas filling stations is limited.
On the other hand, has a high energy density, both in terms of mass and volume, making it an attractive fuel option. However, it requires a high-pressure storage tank, which is heavier and more expensive than a compressed natural gas tank. Also, the availability of hydrogen filling stations is currently limited, which can be a significant disadvantage.
Gasoline has a moderate energy density, but it is a liquid, making it easy to store and transport. It requires a relatively lightweight and low-cost storage tank, which can fit in a typical car's design. Gasoline is widely available, and its use is well established, making it a convenient option for this application. However, gasoline is a fossil fuel and produces greenhouse gases, making it an environmentally less friendly option compared to hydrogen and natural gas.
Based on the above analysis, we recommend using gasoline for this transportation application. Gasoline has a reasonable energy density, is easy to store and transport, and the cost of its storage tank is relatively low. Also, gasoline is widely available, and its use is well-established. Although hydrogen has a higher energy density than gasoline, it requires a more expensive and heavier storage tank, and its availability is limited. Compressed natural gas has a low energy density and requires a large and heavy storage tank, which is not suitable for this application.
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Find the concentration of Pb2 (aq) in ppm by mass of a 1.13 L sample of contaminated water that was assayed by adding NaI(s) and obtaining 55.1x10-3 g of PbI2(s) precipitate. Assume that Pb2 (aq) is completely precipitated as PbI2(s). The molar mass of PbI2(s) is 461.01 g/mol. Assume that the density of the solution is 1.00 kg/L. Give the answer with 3 or more significant figures.
Answers
Answer:
22.1 ppm
Explanation:
The equation of the reaction is;
Pb2+ (aq) + 2NaI(s) ------>PbI2(s) + 2 Na^2+
Mass of precipitate = 55.1x10-3 g
Number of moles of precipitate = 55.1x10-3 g/461.01 g/mol = 1.2 * 10^-4 moles
1 mole of Pb2+ yields 1 mole of PbI2
Hence 1.2 * 10^-4 moles of Pb2+ also yields 1.2 * 10^-4 moles of PbI2.
Hence mass of Pb2+ present = 1.2 * 10^-4 moles * 207 g/mol = 0.025 g or 25 mg
Mass of solution = Density of solution * volume of solution
Mass of solution = 1.00 kg/L * 1.13 L
Mass of solution = 1.13 Kg
Concentration in mg/Kg(ppm) = mass of solute/mass of solution
= 25 mg/1.13 kg
= 22.1 ppm
Solar and wind energy are both intermittent resources that cannot be relied upon for a constant stream of energy production. Explain why developing better ways to store energy is an important part of making these energy sources more practical to use.
Answers
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers.
By removing the need to build additional transmission lines and equipment, energy storage may reduce costs for utilities and their customers. Energy storage's inherent ability to offer backup power in the event of grid failure is a feature that both residential consumers and commercial owners find highly desirable.
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What is the pH of a 0.8 M solution of HCI?
Answers
Answer: pH = 0.1
Explanation: pH = - log[H3O^+] .
HCl reacts with water : HCl + H2O -> Cl^- + H3O^+
So [H3O^+] = c(HCl) = 0.8 M
pH = - log(0.8) = 0,0969
If the copper is drawn into wire whose diameter is 9.50 mm, how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm3. (Assume that the wire is a cylinder whose volume is V=πr2h, where r is its radius and h is its height or length.)
Answers
Answer:
The length of the wire is 2369.84cm
Explanation:
Hope its right :)
how many moles of al is needed to replace all the iron from 5.6 moles of fe2o3
Answers
HELPP !!! What’s a solid
Answers
Answer:
a solid is a physical item
hypothesis : if i feed my guinea pig a healthy diet , then he will live longer what is the controll group and the experimental group ?
Answers
Answer:
the control group is a regular guinea pig fed normally, the experimental is the extra healthy diet, hope this helps
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
(f) Which structure represents the arrangement of atoms in pure copper? A B C D Tick one box. A B C D
Answers
Structure A represents the arrangement of atoms in pure copper because copper is a solid and only made of one type of atom.
What is pure copper described as?The chemical element copper has the atomic number 29 and the symbol Cu. Copper, a transition metal, is a solid at ambient temperature.
Pure copper has a low hardness, is exceedingly ductile, and is malleable. For electrical applications, a number of reasonably pure Cu grades are produced, with small variances in deoxidation.
Solid copper is defined as a face-centered-cubic (fcc) arrangement of copper atoms.
Thus, structure A correctly represents the arrangement of atoms in pure copper.
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7. What is the volume of the
composite
solid?
4 in.
3 in.
3 in.
Answers
Answer:
The volume of Component 1 is 36 cubic inches.
Explanation:
To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.
In this case, the composite solid consists of multiple components with the following dimensions:
Component 1:
Length: 4 inches
Width: 3 inches
Height: 3 inches
To find the volume of Component 1, we multiply the length, width, and height together:
Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches
Therefore, the volume of Component 1 is 36 cubic inches.
Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.
What is the molar mass of Al(BrO2)
Answers
Answer:
The molar mass is 138.8843 g/mol
An atom of an unknown element can gain 3 electrons to reach a
full octet.
How many valence electrons does an atom of this element have?
Answers
Answer:
it has 5 valance electronsExplanation:
the full octate means having 8 electrons in its valance shell ,the element which gain 3 electrons to full octate is 8-3 = 5 it has 5 valance electrons and when it gains 3 electrons it fulls octate it is found in group or column 5,it is from Nitrogen family I think it is help ful for you100 Points! PLZ HELP
Which statement best describes the model below?
Answers
the image shows the moles of gas increasing as well as volume increasing
Answer:
Option D
Explanation:
Because we know the relationship between no of moles and volume
Volume is directly proportional to no of molesSo if moles is increased volume would be increased too .Option D
2 A high school student takes a lump of magnesium with a volume of 150.0 mL and adds it to a beaker of
an aqueous solution of aluminum nitrate. What is the mass of the solid aluminum that forms?
Solid magnesium has a density of 1.738 g/cm³.
Answers
The mass of the solid aluminum that forms are 192.73 grams
To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.
The balanced chemical equation is:
3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al
The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.
To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:
Mass = Volume × Density
Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g
Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:
Moles of magnesium = Mass of magnesium / Molar mass of magnesium
= 260.7 g / 24.31 g/mol
= 10.72 mol
According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:
Moles of aluminum = (2/3) × Moles of magnesium
= (2/3) × 10.72 mol
= 7.15 mol
Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):
Mass of aluminum = Moles of aluminum × Molar mass of aluminum
= 7.15 mol × 26.98 g/mol
= 192.73 g
Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.
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What would make oppositely charged objects attract each other more?increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged objectdecreasing the positive charge of the positively charged object and decreasing the negative charge of the negatively charged objectincreasing the distance between the positively charged object and the negatively charged objectmaintaining the distance between the positively charged object and the negatively charged object
Answers
Answer:
increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object would make the oppositely charged objects attract each other more.
Without checking and reporting their boiling points, rank the boiling points of H2O, MgCl2, HBr, and HF H2S from the lowest to highest based on your knowledge of intermolecular forces, hydrogen bond, and ionic bond. Explain how you make your predictions without checking a reference.
Answers
As HF is hydrogen bonded, it has a highest boiling point of 19 oC or less, when it becomes liquid. The boiling points of the remaining hydrogen halides, which are gaseous, are determined by the van der Waal forces.
H2O or HF, which has the higher boiling point?Hydrogen fluoride (H 2 F) has a lower boiling point than water (H 2 O) ( ). H2O has a boiling point of 100 °C while only having a boiling point of 5 °C. Despite the fact that water and hydrogen fluoride have stronger hydrogen bonds than each other, water only forms two hydrogen bonds per molecule whereas hydrogen fluoride only forms one.
Which has the highest boiling point between H2O and HCL?Furthermore, water creates hydrogen bonds between nearby molecules. The extremely electronegative oxygen on the other molecule interacts with hydrogen. This is a strong type of interaction that takes more energy than dipole-dipole interactions. As a result, water boils at a greater temperature than HCL.
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prepare an editorial for national newspaper Daily highlighting the importance of sustainable development
Answers
SERIOUS flooding IN DELHI
Explanation:
Look at the graph that shows the progress made in reducing fuel cell system costs. Graph of progress in reducing Fuel Cell System has an x axis labeled Years from 2002 to 2010, and a y axis labeled cost in dollars per kilowatt hour from 0 to 300. Data is: 2002, 248 dollars. 2003, 198 dollars. 2004, 149 dollars. 2005, 99 dollars. 2007, 82 dollars. 2008, 60 dollars. 2009, 51 dollars. 2010, 43 dollars. 2015 goal is 30 dollars per kilowatt hour. Which conclusion is supported by the information in the graph? The cost of producing a kilowatt of power with a fuel cell will be less than $30 in 2015. Fuel cell cars are unlikely to be affordable in the near future. The rate of emissions is decreasing because of inexpensive fuel cell technology. The environment is unlikely to improve as a result of cheap fuel cell technology.
Answers
The cost of producing a kilowatt of power with a fuel cell will be less than $30 in 2015.
Based on the data provided in the graph, the cost of fuel cell systems has been decreasing over the years. In 2010, the cost was $43 per kilowatt hour, and the graph does not show any data beyond that year. However, it is mentioned that the goal for 2015 is to reach a cost of $30 per kilowatt hour. Given the decreasing trend in the cost of fuel cell systems, it is reasonable to conclude that the cost will be less than $30 in 2015, supporting the mentioned conclusion.
The wave speed of sound waves traveling through four different media were measured at a constant temperature. Results are summarized in the tabl- Based on the data, which medium has the highest density? Medium Wave speed of Sound Unknown A 366 m/s Unknown B 1,433 m/s Unknown C 5,640 m/s Unknown D 6,100 m/s Unknown B Unknown A O Unknown D Unknown C
Answers
The wave speed of sound traveling through the four different media, Unknown D has the highest density.
Based on the data provided, we can determine which medium has the highest density by considering the wave speed of sound in each medium. The speed of sound is influenced by the density of the medium it is traveling through. In general, sound waves travel faster in denser media.
The wave speeds for the four unknown media are
Unknown A: 366 m/s
Unknown B: 1,433 m/s
Unknown C: 5,640 m/s
Unknown D: 6,100 m/s
From these values, we can see that sound waves travel the slowest in Unknown A and the fastest in Unknown D. Since sound waves typically travel faster in denser media, we can infer that Unknown D has the highest density among the four media. Conversely, Unknown A has the lowest wave speed, which suggests that it has the lowest density.
In summary, based on the wave speed of sound traveling through the four different media, Unknown D has the highest density.
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PLEASE HELP ME NO ONE WILL THIS IS IMPORTANT ALOT OF POINTS! A student's favorite drink is sweet tea. Every morning he makes it by adding exactly thirty grams of sugar and one tea bag to one liter of hot water. Some days his tea does not taste as sweet as other days. Those same days he notices that there is sugar sitting at the bottom of the cup that will not dissolve no matter how long he stirs. He decided to filter out the remaining sugar and keep track of the data in the graph below.
Explain why different amounts of sugar might dissolve at different times.
Consider:
1. which day the least sugar dissolved and which day the most sugar dissolved.
2. what could have caused less sugar to dissolve on some days
3. what the student could do to his drink to make more sugar dissolve.
Be sure to consider the completeness of your response, supporting details, and accurate use of terms. Your response should be 6-8 complete sentences.
Answers
The solubility of a substance, such as sugar, depends on several factors, including temperature, pressure, and the presence of other solutes. In this case, the student adds the same amount of sugar and tea bag to the same amount of hot water every day, but the temperature of the water could vary from day to day, affecting how much sugar dissolves.
According to the graph, the least amount of sugar dissolved on day 3, while the most sugar dissolved on day 5. The difference in temperature on these days could explain this variation. On day 3, the water may have been cooler, making it more difficult for the sugar to dissolve. On the other hand, on day 5, the water may have been hotter, which could have increased the solubility of the sugar.
To increase the amount of sugar that dissolves in the tea, the student could try using hotter water or stirring the sugar more vigorously to distribute it evenly throughout the water. Alternatively, the student could try adding the sugar gradually while stirring to give it more time to dissolve before adding more.
Answer:
I'm not 100% sure on this because mine hasn't been graded yet, but here are the answers I submitted.
Explanation:
Which day the least sugar dissolved and which day the most sugar dissolved:
Day 4 is when the least sugar dissolved, and Day 2 is when the most sugar dissolved.
What could have caused less sugar to dissolve on some days:
The temperature of the tea could have caused the sugar not to dissolve on some days.
What the student could do to his drink to make more sugar dissolve.
The student would need to add the sugar to the tea as soon as it's done boiling. The Sugar will dissolve faster in a warmer tea due to more energy of movement.
Be sure to stir the tea as you add the sugar. Stirring the sugar into the tea speeds up the rate of dissolving by helping distribute the sugar particles throughout the tea.
If the student were to use granulated sugar, those are smaller particles and have greater surface area. Greater surface area allows for more contact between the tea and the sugar.
cadmium metal reacts with a nickel (III) chlorate solution
Answers
What mass of NaCl is needed to produce a 26.4 mol/L with a 1.7 L volume?
Answers
we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.
To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.
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A chemistry student is given 250.0 mL of clear aqueous solution at 42 C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 25C. At that point, the student sees that a precipitate has formed. He pours off the remaining liquid solution, throws away the precipitate and evaporates the remaining liquid solution under vacuum. More precipitate forms. The student washes, dries, and weighs the additional precipitate. It weighs 8.75 g. Using only the information above, can you calculate the solubility of X at 25C? If yes, calculate it.
Answers
Answer:
No
Explanation:
The solubility of a solid in water refers to the amount of that solid that dissolves in water.
It is not possible to calculate the solubility of the solid because the student threw away the first precipitate that formed. We already have the volume of water, but having lost some mass of precipitate, it has become impossible to accurately determine the solubility.
Hence the answer provided above.
Explain if the reaction of iron and copper sulfate supports the Law of Conservation of Mass. Use evidence and scientific reasoning to support your answer.
Answers
use the molarity of citric acid to find the moles of citric acid contained in a 2-L bottle of each soda
Answers
In order to find molarity, the moles of citric acid must be given. Since there was no equation given, I cannot help you find the answer for a 2 liter solution since the base molarity or moles used is not provided. However, I will post an example of how to find the answer you're looking for. You will need to use the following equation to find your definite answer:
(molarity of concentrated)(volume of concentrated)=(molarity of diluted)(volume of diluted)
Explanation:
Some key points about the equation given:
- volume will always be in liters
- concentrated would be the original molarity and volume of citric acid that was given. If no volume was given, you were most likely given moles. In this case to find volume use the following equation: molarity = (moles/volume) where volume will be the variable you're solving for which will turn into the next equation of: (moles/molarity) = volume
- volume of diluted will be 2
view the following attachment for an example
