If a Cu^2+ ion drops through a potential difference of 12V, it will acquire a kinetic energy (no friction) of?
A. 3.0 eV
B. 6.0 eV
C. 12.0 eV
D. 24.0 eV
Answers
If a \(Cu^2+\) ion drops through a potential difference of 12V, it will acquire a kinetic energy (no friction) of D. 24.0 eV.
The kinetic energy acquired by a \(Cu^2+\) ion when it drops through a potential difference of 12V is:
Step 1:
Recall the formula for the kinetic energy gained by a charged particle moving through a potential difference:
KE = qV, where KE is the kinetic energy, q is the charge of the particle, and V is the potential difference.
Step 2:
Find the charge of a \(Cu^2+\) ion. A \(Cu^2+\) ion has a charge of \(+2e\), where e is the elementary charge (1.6 x 10⁻¹⁹ C).
Step 3:
Calculate the kinetic energy. KE = (2e)(12V) = 24eV.
Therefore, the kinetic energy acquired by the \(Cu^2+\) ion is 24.0 eV.
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Related Questions
When a caterpillar is big enough, it will form a chrysalis. During which stage of metamorphosis does this occur? (2 points) a Adult b Egg c Nymph d Pupa
Answers
Answer: The stage of metamorphosis this occurs is called the PUPA stage. The correct option is D.
Explanation:
Metamorphosis can be defined as the change in form, mode of life and behaviour that occurs during embryonic development of an organism. In the metamorphosis of insects, which mostly reproduce sexually, insects can be grouped according to the way the eggs develop into adults. Some show:
--> Complete metamorphosis or
--> Incomplete metamorphosis.
In the life cycle of a butterfly, a COMPLETE metamorphosis occurs. This is because after fertilization, the EGG hatches into LARVA which passes through a PUPAL stage before becoming transformed into an ADULT insect. That is:
Egg --> Larva --> Pupa --> Imago.
When the caterpillar, which is the Larva stage, has reached its full size, it spins a pad of silk on a twig. It moves upward and attached it's clasper to this pad. It spin another silk thread at the thorax. These aids it to assume a slanting position with the head end pointing upwards. The pupa stage called the CHRYSALIS is reached when it tucks it's head under its thorax, arches it's body, shortens and broadens, and moults for the last time. Therefore the correct option is D (pupa).
Answer:
The answer is D. Pupa
Why is copper a good conductor of electricity?
A.
Copper atoms hold onto their electrons very tightly.
B.
Electrons can move easily between copper atoms.
C.
Copper atoms are bonded together in molecules.
D.
Copper atoms can flow quickly along a wire.
Answers
Answer:
B. Electrons can move easily between copper atoms.
Explanation:
What is the connection between physical properties and physical changes
Answers
Answer:
Info from G00gle:Physical changes are related to physical properties since some measurements require that changes be made. Melting Point: As solid matter is heated it eventually melts or changes into a liquid state at the melting point. Ice (a solid form of water) melts at 0 oC and changes to the liquid state.
Explanation:
Mark me brainliest
Answer:
the answer is A
Explanation:
A glowing beam of electric current is deflected away from a negatively charged object. What does this tell us about electricity?
It is densely packed and has a positive charge
It is made of negatively charged particles.
It is mostly empty space.
It is composed of a positive charge that is spread out with negative charges scattered about within it.
Answers
An electric field is produced when high voltage is applied to capacitor plates, deflecting cathode rays. The negatively charged electrons are directed away from the negatively charged plate and toward the positively charged plate when a cathode ray is transmitted through this electric field.
What is Electricity ?Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations
Voltage, current, and resistance are the three most fundamental elements of electricity. Voltage is comparable to the force that forces water through a hose. It is expressed as volts (V). CURRENT is comparable to the hose's diameter.
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Who was the first person to suggest the existence
of atoms?
Dalton
Democritus
Proust
O
Thomson
Answer is C
Answers
Answer:
democritus is the first person
What happens to the hydrogen and oxygen molecules when they rearrange to from water.something must be recombined.How does this happen?
Answers
When the preexisting molecular links are broken and new bonds are created between oxygen and hydrogen atoms, hydrogen molecules react strongly with oxygen molecules.
The outcome is an explosive release of energy and the formation of water since the reaction's products are at a lower energy level than its reactants.
What kind of response takes place when water is created?The most well-known instance of a synthesis reaction is the burning of hydrogen and oxygen to produce water.
What causes water to form?Most of the water that was created was in the form of vapors, which mixed with cosmic dust on the way to the earth's surface. These water vapors condensed into oceans, seas, rivers, and lakes when the world first came into existence.
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Hypothesis: If you can measure the pH of a range of acids and bases using a universal pH indicator, then you can use those values to calibrate a cabbage pH indicator. To determine the pH of a solution using a pH indicator paper, you need a .
Answers
To determine the pH of a solution using a pH indicator paper, you need a color chart or a color scale that corresponds to different pH values.
This color chart or scale is used to compare the color of the pH indicator paper after it has been immersed in the solution. The pH indicator paper is impregnated with a universal pH indicator, which is a chemical compound that changes color depending on the acidity or alkalinity of the solution.
The indicator undergoes a chemical reaction with the hydrogen ions (H+) or hydroxide ions (OH-) present in the solution, resulting in a color change.
By comparing the color of the pH indicator paper with the color chart or scale, you can determine the approximate pH of the solution. The color chart usually provides a range of colors corresponding to different pH values, allowing you to match the observed color to the nearest pH value.
In the hypothesis mentioned, the aim is to calibrate a cabbage pH indicator using the pH values obtained from a universal pH indicator. Therefore, in addition to the pH indicator paper and color chart, you would also need a range of solutions with known pH values to establish a calibration curve specific to the cabbage pH indicator.
In summary, to determine the pH of a solution using a pH indicator paper, you need a color chart or scale that correlates the observed color of the pH indicator paper with different pH values. This chart or scale serves as a reference for interpreting the color change and determining the pH of the solution.
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Answer: COLOR KEY
Explanation: CS
Describe the feedback loop involving water vapor and temperature. Is it positive or negative?
Answers
Answer:
The feedback loop involving water vapor and temperature is a positive feedback loop. As temperature increases, the amount of water vapor that can be held in the atmosphere also increases. This leads to an increase in the amount of water vapor in the atmosphere, which further amplifies the greenhouse effect and contributes to additional warming.
In other words, warmer temperatures lead to more water vapor in the atmosphere, which traps more heat, causing further warming, and so on. This positive feedback loop can amplify the initial warming effect caused by other factors such as greenhouse gas emissions or changes in solar radiation.
Conversely, if the temperature decreases, the amount of water vapor that can be held in the atmosphere decreases, which can lead to a decrease in the amount of water vapor present in the atmosphere, reducing the greenhouse effect and contributing to cooling. However, this negative feedback loop is weaker than the positive feedback loop described above, and it tends to be dominated by the positive feedback loop under most circumstances.
PLEASE HELP!!
George is writing an essay about the role of observation and inference in the development of the atomic theory. He wants to explain why it was more difficult to observe the presence of neutrons in atoms. Which statements should he include in his essay? Choose the two statements that apply.
A. While protons or electrons can be influenced by other charged particles, neutrons are not.
B. It was difficult to observe that neutrons were different than protons because the two particles respond to charge in the same way.
C. It was difficult to observe that neutrons were different than electrons because the two particles respond to charge in the same way.
D. Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.
Answers
Answer:
D and A
Explanation:
While protons or electrons can be influenced by other charged particles, neutrons are not.
and
Neutrons are held tightly together with protons in the nucleus, so scientists could not observe the behavior of neutrons independently.
Glycerine is viscous than water?why
Answers
Answer:
Yes
Explanation:
Why is glycerol more viscous than water?
The glycerine is more viscous than water because due to presence of hydrogen atoms , we all know that glycerine has more hydrogen bonding than water molecule , which makes an aggregation which means that glycerine is more viscous than water , in simple words glycerine can't flow as that of water molecule.
If a dextrose solution had an osmolarity of 100 mosmol/l, what percentage (w/v) of dextrose (mw = 198.17) would be present?
Answers
The percentage (w/v) of dextrose in the solution is approximately 1.9817%. To determine the percentage (w/v) of dextrose in a solution with a given osmolarity, we need to calculate the amount of dextrose present in 100 mL of the solution.
First, we convert the osmolarity from mosmol/L to mosmol/100 mL:
100 mosmol/L = 100 mosmol/100 mL
Next, we calculate the number of moles of dextrose present in 100 mL of the solution:
Number of moles = Osmolarity (in mosmol/100 mL) / 1000
Number of moles of dextrose = 100 mosmol/100 mL / 1000 = 1 mosmol/100 mL
Now, we can calculate the mass of dextrose present in 100 mL of the solution:
Mass of dextrose = Number of moles of dextrose * Molecular weight of dextrose
Mass of dextrose = 1 mosmol/100 mL * 198.17 g/mol = 1.9817 g/100 mL
Finally, we can calculate the percentage (w/v) of dextrose:
Percentage (w/v) = (Mass of dextrose / Volume of solution) * 100
Percentage (w/v) = (1.9817 g/100 mL / 100 mL) * 100 = 1.9817%
Therefore, the percentage (w/v) of dextrose in the solution is approximately 1.9817%.
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Which of the following explanations correctly describes the materials?
A) Plastic polymers used in bottles are short molecules that create a non-flexible
structure.
6 Plastic polymers used in bottles are long molecules that create a very flexible
structure.
Calcium carbonate is a short molecule that creates a very flexible structure.
Calcium carbonate is a long molecule that creates a non-flexible structure.
Answers
Large molecules known as polymers are composed of networks or long chains of monomers, which are smaller molecules. Silk, hair, proteins, and DNA are examples of natural polymers, whereas polyethylene, polypropylene, and polyester are examples of synthetic (man-made) polymers.
The traits that polymers display are one of their main advantages over tiny molecules (monomers). Compared to tiny molecules, polymers typically have higher viscosities, higher boiling temperatures, and better mechanical strength (monomers).
To create polymer components or products, there are five fundamental processes. These include blow molding, extrusion, injection molding, compression molding, and transfer molding. The principal applications for compression molding and transfer molding are thermosetting polymers.
Plastics are a class of materials that may be molded when soft and then hardened to maintain the desired shape. These materials can be manmade or naturally occurring. Polymers make up plastics. A substance comprised of several repeating units is called a polymer.
High strength or modulus-to-weight ratios (lightweight yet relatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost are a few advantageous characteristics of numerous engineering polymers.
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what is a matter and how do it work?
Answers
Answer:
Matter is any substance that has mass and takes up space. Any physical object consists of matter. It doesn't matter whether it's an atom, element, compound, or mixture. It's all matter. (Not a pun, i promise ツ)
However, unlike some believe, not everything you encounter in the world is matter. Matter can be converted into energy, which has neither mass nor volume. So, light, sound, and heat are not matter. Most objects have both matter and some form of energy, so the distinction can be tricky. For example, a candle flame certainly emits energy (light and heat), but it also contains gasses and soot, so it is still matter. The building blocks of matter are called "atoms" and "molecules." They, too, are matter. The matter we can detect normally is called "baryonic" matter. However, there is another type of matter out there, which can't be directly detected. But its influence can. It's called dark matter.
Attached below is a picture of examples of matter.
Key words and phrases:
matter, heat, light, dark matter, baryonic matter, sound, energy, mass, volume, space, physical
Hope this helps! Brainliest would be much appreciated! Have a great day! :)
Be sure to answer all parts. Write the structural formula of a compound of molecular formula C4H8 Cl2 in which none of the carbons belong to methylene groups. Cl2 at the terminal end. CH3 on both ends of the chain.
Answers
The structural formula of the compound with the molecular formula C₄H₈Cl₂, in which none of the carbons belong to methylene groups, CH₃ groups are present on both ends of the chain, and Cl₂ is at the terminal end, is 1-chloro-2,2-dimethylpropane.
Determine how to find the structural formula of the compound?To satisfy the given conditions, we start by placing the two Cl atoms at the terminal end of the chain. Since there are no methylene groups, we need a branched structure.
We have two CH₃ groups, so we attach them to the two remaining carbons of the chain. To ensure there are no methylene groups, we place the CH₃ groups on adjacent carbons, resulting in a total of three carbons in the main chain.
This gives us a molecular formula of C₃H₆. To complete the molecular formula C₄H₈Cl₂, we add a methyl group (CH₃) to one of the carbons attached to the Cl atom.
Therefore, the structural formula of the compound is 1-chloro-2,2-dimethylpropane.
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Please the app isn’t working and I can’t find other questions that got answered
Answers
Given:
Sum of masses of two isotopes = 371.9087 u
Re-185 natural abudance = 37.40%
Re-187 natural abudance = 62.60%
Known:
atomic weight of Re = 186.207 u
Atomic mass of Re-185:
To find the atomic mass of Re-185, take the total mass given and subtract atomic weight.
abundance of Re-185 = 37.40% = 0.3740
(371.9087 - x) = atomic weight of Re-187 in u
To find mass of Re-187:
abundance of Re-187 = 62.60% = 0.6260
Solution:
Step 1. Multiply x times the abundance of Re-185 and multiply (371.9087 - x) times the abundance of Re-187.
Re-185: (0.3740)(x) = 0.3740x
Re-187: (0.6260)(371.9087 - x) = 232.8148462 - 0.6260x
Step 2. Add the results and set them equal to 186.207.
0.3740x + 232.8148462 - 0.6260x = 186.207
Step 3. Solve for x by subtracting 232.8148462 from both sides and then divide both sides by -0.2520.
0.3740x + 232.8148462 - 0.6260x - 232.8148462 = 186.207 -
232.8148462
0.3740x - 0.6260x = -46.6078462
-0.2520x = -46.6078462
-0.2520x/-0.2520x = -46.6078462/-0.2520
x = 184.9517706 u
Step 4. Atomic weights of Re-185 and Re-187.
x = 185.0 u = the atomic weight of Re-185
(371.9087 - 184.9517706) = 186.9569294 = 187.0 u = the atomic weight of Re-187
Therefore the atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u.
Please answer this question quickly!
Answers
There is more available soluble oxygen in the cold tank than in the warmer tank hence more fish can survive in the cold tank.
Why does Oxygen solubility decrease with temperature?
The kinetic energy of the solvent molecules increases together with the temperature of a solution. As a consequence, the distance between solvent molecules increases, decreasing the number of places where gas molecules can dissolve.
In other words, the solubility of the gas drops as temperature rises because the solvent molecules are less able to cling to the gas molecules.
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At what temperature would a 1.30 m NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86 ∘C/m .
Answers
Answer:
-4.59°C
Explanation:
Let's see the formula for freezing point depression.
ΔT = Kf . m . i
ΔT = Freezing T° of pure solvent - Freezing T° of solution
Kf = Freezing constant. For water if 1.86°C/m
m = molality (moles of solute in 1kg of solvent)
i = Van't Hoff factor.
0°C - Freezing T° of solution = 1.86°C /m . 1.30m . 1.9
Freezing T° of solution = - (1.86°C /m . 1.30m . 1.9)
Freezing T° of solution = - (1.86°C/m . 1.30m . 1.9) → -4.59°C
NaCl → Na⁺ + Cl⁻
22) Name the neutral element with this orbital diagram.
Answers
Answer:
Sn (Tin)
Explanation:
what is the mass percent of water in plaster of paris
Answers
Answer: 18.5%
Explanation:
A mixture is made by combining 1.63 lb of salt and 4.50 lb of water. What is the percentage of salt (by mass) in this mixture
Answers
Answer:
Explanation:
Convection is the transfer of Response area by the movement of heated matter.
a. True
b. False
Answers
Answer:
true
Explanation:
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How many liters of carbon dioxide can be “scrubbed”, or removed, with 3.45 Liters of 0.10 M of lithium hydroxide solution?
Answers
Answer:
The correct answer is - 3.864 L of CO2.
Explanation:
please explain why boiling point melting are not considered chemical properties but are considered physical properties of matter
Answers
Answer:
All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).
Question 1 of 10 What would be a good description of what activating prior knowledge means? O
A. Prior to reading, look at the end of the book or article.
O B. Before you read, recall knowledge you already have about the subject.
O C. Before you read, think about what you hope to learn.
O D. Before reading, find other material that is similar to what you are going to read
Answers
Answer:
B
Explanation:
Because activating prior knowledge means getting what you already know on the subject.
URGENT !!!
Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction? (3 points)
HCl and CaCl2
HClO and CaHClO
H2O and Ca(OH)3
H3PO4 and Ca(PO3)2
Answers
HCl and CaCl2
I took the test and it wright
The correct pair that lists a substance that can neutralize \(\rm Ca(OH)_2\) and the salt that would be produced from the reaction is HCl and \(\rm CaCl_2\).
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
When HCl (hydrochloric acid) reacts with \(\rm Ca(OH)_2\) (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion (\(\rm H^+\)) to the \(\rm Ca(OH)_2\), resulting in the formation of water (\(\rm H_2O\)) and \(\rm CaCl_2\) (calcium chloride).
The reaction can be represented as follows:
\(\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2\)
Therefore, HCl is an acid that can neutralize \(\rm Ca(OH)_2\) and the salt produced from this reaction is \(\rm CaCl_2\).
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air at 40c and 2 atm is passed through a shallow bed of napthalene spheres 12 mm in diameter at a rate of 2 m/s based on the empty cross section onto the bed
Answers
Airat 100ºF and 2 atm is passed through a shallow bed ofnaphthalene spheres ½ in. in diameter at rate of 5 ft/s, based onthe empty cross sectionof the bed.
What is of naphthalene?The simplest polycyclic aromatic hydrocarbon, naphthalene is an organic chemical with the formula It is a white crystalline solid with a distinctive odor that may be detected at concentrations as low as 0.08 ppm by mass. The structure of naphthalene is a fused pair of benzene rings, making it an aromatic hydrocarbon. The primary component of conventional mothballs is what makes it most well-known.
Two distinct accounts from the early 1820s mentioned a white solid produced by the distillation of coal tar that had a strong odor. In 1821, John Kidd cited these two disclosures and went on to discuss many of the qualities and methods of manufacturing of this drug. He suggested calling it naphthaline.
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What is the Big Bang Theory?
Answers
Answer:
the answer is c
plz mark me as brainly
Explanation:
A sample of lithium sulfate, Li2SO4, has 2. 94 x 1023 atoms
of lithium. How many moles of lithium sulfate is the sample?
Answers
The molar mass of lithium sulfate (Li2SO4) is:
Li2SO4 = 2 x Li + 1 x S + 4 x O = 2(6.94 g/mol) + 32.06 g/mol + 4(16.00 g/mol) = 109.94 g/mol
To find the number of moles of lithium sulfate, we need to first find the number of moles of lithium in the sample:
2.94 x 10^23 atoms of Li x (1 mole of Li/6.022 x 10^23 atoms of Li) = 0.488 moles of Li
Since there are two moles of lithium for every one mole of lithium sulfate, the number of moles of lithium sulfate in the sample is:
0.488 moles of Li x (1 mole of Li2SO4/2 moles of Li) = 0.244 moles of Li2SO4
Therefore, the sample contains 0.244 moles of lithium sulfate.
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which physical method can separate a mixture of steel ball bearings and marbles? boiling evaporation filtration
Answers
Steel ball bearings and marbles can be separated through manual sorting due to their difference in appearance.
Before answering the question, let us define the given choices.
The boiling separation technique is used when the boiling points of the components of a mixture are different. It is mostly done for the separation of homogeneous mixtures. The evaporation separation technique is usually used for the separation of a solvent and a soluble solid. Enough heat is provided for the solvent to be evaporated. The process is also slower compared to the boiling separation technique. Filtration is used to separate insoluble solid particles from the liquid. Materials such as filter paper are used in this process.The given separation techniques are not suitable for the separation of steel balls bearings, and marbles. Instead, the sorting separation technique must be used. This is used for manually sorting coarse materials based on their physical characteristic, which in this case is their difference in appearance.
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In the previous step, you determined
0.25 mol HCI reacts. The molar mass
of Mg is 24.31 g/mol.
What mass of Mg is required?
PLEASE HELP ASAP
Answers
Approximately 3.04 grams of magnesium would be required to react with 0.25 moles of hydrochloric acid.
To determine the mass of Mg required, we need to use the balanced chemical equation for the reaction between hydrochloric acid (HCl) and magnesium (Mg):
2HCl + Mg → MgCl2 + H2
From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Mg. Therefore, if 0.25 mol of HCl reacts, we would need half of that amount, which is 0.125 mol of Mg.
To calculate the mass of Mg required, we need to multiply the number of moles of Mg by its molar mass. The molar mass of Mg is given as 24.31 g/mol. Therefore, the mass of Mg required can be calculated as follows:
Mass of Mg = Number of moles of Mg × Molar mass of Mg
Mass of Mg = 0.125 mol × 24.31 g/mol
Mass of Mg = 3.04 g
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