Answer:
The opposite of an endothermic process is an exothermic process, one that releases or "gives out" energy, usually in the form of heat and sometimes as electrical energy.
Explanation:
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Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best conclusion about Particles A and B?
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Answer:
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Explanation:
When an electron in excited energy level drops to a lower energy
level, a photon is emitted.
If the electron is dropping to n=1, which transition will emit the longest
wavelength? n= ____ was to n=1.
The transition between n=1 and n=2 corresponds to the longest wavelength with the lowest frequency.
An electron is said to be "excited" when it is promoted to a higher energy level inside its bound state.
Either the electron absorbs a photon and obtains all of its energy, or it receives energy via a collision with another, energetic electron.
Understanding energy levels :
Therefore the transition between n=1 and n=2 corresponds to the longest wavelength at the lowest frequency.
The higher the frequency of a photon, the higher its energy.
The longer the wavelength of a photon, the lower its energy.
E ∝ 1/λ [ FOR PHOTON ]
The lowest energy is 1 eV, which corresponds to the transition between the n=1 and n=2 levels.
The longest wavelengths are associated with the lowest energies, so transitions between n=1 correspond to the longest wavelengths.
The term "thermal excitation" refers to the process by which electrons within a semiconductor crystal lattice are elevated to a higher energy band via lattice vibrations. This process, known as electron relaxation, occurs when an excited electron returns to a less energetic state.
As a result, a photon is released into the environment, or energy is transferred to another particle. The amount of energy released is proportional to the gap in potential energy between the electron's lowest and highest states.
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which of the beryllium halides are considered ionic compounds?
Answer:
Beryllium Fluoride (BeF2) is an ionic compound
Calculate the volume of a clear liquid that has a mass of 20 g and a density of 15.77 g/mL.
Answer:
20 g g/mL. 15.77
Explanation:
i think i answer it
Potential Energy vs Height
This graph shows the relationship between the height of
an object and the object's gravitational potential energy
Potential Energy vs Mass
This graph shows the relationship between the most
an object and the object's gravitational al energy
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60
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Potential energy (J)
Potential energy (J)
40
40
20
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04
0
0
0
20
80
100
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100
40 60
Height (m)
40 60
Mass (kg)
21. Look at the graphs of gravitational potential energy, height, and mass. Based on
these graphs, write an argument on whether height or mass has a greater effect on
gravitational potential energy
cos
Answer:
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Explanation:
How many valence electrons in this electron configuration 1S2 2S2 2P6 3S2
Answer:
Explanation:
Electron Configurations
A B
Fluorine 1s2 2s2 2p5
Neon 1s2 2s2 2p6
Sodium 1s2 2s2 2p6 3s1
Magnesium 1s2 2s2 2p6 3s2
Which is an example of chemical weathering?
Think of a time you might have used the scientific method without even realizing it.
Answer:
when i exist
Explanation:
What MUST always be true of the masses of the red and blue liquids?
А.
They will NEVER equal the mass of the purple liquid to the right of the arrow.
B.
They will ALWAYS equal the mass of the purple liquid to the right of the arrow.
The
6.
1. 0,005
5x10 3.
7.
2. 5,050
=
88104
8.
3. 0.0008 =
1 X 103
9.
4. 1,000 =
10
10
5. 1,000,000 =
Answer:
So the asnwer is 66666666666666666666666666666666666666666666666666666666666666666666666666666666666668888844444444444444444443299997832........................................................4563ygfdjuzgu3456655555555555555555555553444446445444444555554
Explanation:
Please help me..
Will give the brainliest
Urgent
Please answer correctly
Explanation:
a) blue litmus paper turns red when u add acid in it .
b) red litmus paper , when an alkali dissolves in water it produce hydroxide ions
which cause it to become a alkaline
what is the maximum wavelength of photon that will eject a ground state electron from a hydrogen atom?
Answer:
9.13 x 10^-8 m
Explanation:
The maximum wavelength of photon that will eject a ground state electron from a hydrogen atom is 9.18 * 10^-8.
What is wavelength?
Wavelength is defined as the distance between identical points in the adjacent cycle of a waveform signal propagated in space or along the wires.
Wavelength is calculated as wave speed and frequency.
Wavelength = speed/frequency
SI unit of wavelength is meter.
A ground state atom is an atom in which total energy of the electron can not be lowered by transferring one or more electrons to different orbitals.
Thus, the maximum wavelength of photon that will eject a ground state electron from a hydrogen atom is 9.18 * 10^-8.
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a space probe identifies a new element in a sample collected from an asteroid. successive ionization energies, in attojoules per atom, for the new element are given in the table. i1 i2 i3 i4 i5 i6 i7 0.507 1.017 4.108 5.074 6.147 7.903 8.294 to what family of the periodic table does this new element probably belong?
The element belongs to group 17 of the periodic table.
In the periodic table, elements are arranged in groups depending on their properties. Usually, elements whose atoms have the same number of valence electrons are placed in the same group.
All the elements in group 17 have seven electrons on their outermost shell. Since an ionization energies of the electrons on the valence shell of an atom are always close together, the ionization energies of the seven electrons as shown indicate that they must be on the same shell.
Hence, the new element must be a member of group 17 of the periodic table.
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Carbon burns with oxygen to produce carbon dioxide gas.
Which of these shows the correct chemical reaction?
O C+0=CO2
O CO, CO2
C +02 + CO2
CO2 = C+0
Answer:
it will help you , but I am not sure it is correct
How long should you monitor a person who shows signs of a mild allergic reaction
Answer:
Most reactions occur quickly after ingestion or contact with the allergen, but some can occur up to a few hours later. There can also be a second phase of the reaction when symptoms reoccur. It is important to keep an eye on your child for about 6-8 hours following the first reaction.
Explanation:
Which group on the Periodic Table has elements that would easily combine with elements from Group 1 (which have one valence electron) because they have 7 valence electrons?
Answer:The halogens in Group 17
Explanation: The halogens in Group 17 all have 7 valence electrons. They will steal anuy electrons they can to form a full outer shell.
What happens when water reaches its boiling point?
Answer:
khi sôi nhiệt độ của nước đạt 100oC, đến lúc này một phần nước sôi sẽ biến thành hơi nước, hơi nước sẽ đùn lên phá vỡ mặt nước và bốc hơi vào không khí, hình thành lên hiện tượng sôi của nước. Nước sôi đánh dấu mốc chuyển đổi trạng thái từ nước (thể lỏng) sang hơi nước (thể khí).
Explanation:
Do gasses have a fixed volume
Answer:
No
Explanation: Gases have no fixed volume and no fixed shape. Gases expand to fill the space available. They can also be compressed into a very small space.
If yuo put hand sanitizer in a bottle, light a match, drop it in the bottle, what will happen?
Answer: As hand sanitizer dries, it evaporates into gas, which can also catch fire. That’s why the experts recommend that people avoid lighters, matches and fires after using hand sanitizer.
Explanation:
Explanation:
A medida que se seca el desinfectante de manos, se evapora en gas, que también puede incendiarse. Es por eso que los expertos recomiendan que las personas eviten los encendedores, fósforos y fuegos después de usar desinfectante para manos.
The formation of a covalent bond involves the
Answer:
Atoms of non metals
Explanation:
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the variable part of an amino acid is the __________.
answer: the variable part of an amino acid is the: SIDE CHAIN
I need the anwer plz helppp this question is worth 25 point
Explanation:
Enzyme X works on sugar C substrate.
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The thermochemical equation for the formation of ammonia (NH3) is shown below. How much energy (kcal) is released when 6.0
mol of H2 reacts?
(Note - when the direction of energy flow is indicated, e.g. "released", the negative sign is not used in the answer.
3 H2(g) + N2(g) →2 NH3(g) triangleH = - 11 kcal
In the formation of NH₃, -22 kcal are released when 6.0 moles of H₂ react.
Let's consider the thermochemical equation for the formation of ammonia.
3 H₂(g) + N₂(g) → 2 NH₃(g) ΔH = - 11 kcal
As we can see, 11 kcal are released when 3 moles of H₂ react. The heat released when 6.0 moles of H₂ react is:
[tex]6.0molH_2 \times \frac{(-11kcal)}{3molH_2} = -22kcal[/tex]
In the formation of NH₃, -22 kcal are released when 6.0 moles of H₂ react.
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Wavelength whose frequency is 5.00 x10^15
The wavelength of the radiation whose frequency is 5 X 10^15s^-1 is 2.4 X 10^-6 inches, or 60 nanometers.
how can you tell the number covalent bonds the atoms of an element can form?
Helium is classified as a(n)?
O alkaline earth metal
O alkali metal
O transition metal
O noble gas
Answer:
NOBLE GAS
Explanation:
Look At The Table Of Elements
What type of front is depicted here? (60 Points)
Cold
warm
stationary
Occluded
Answer:
warm
Explanation:
Explain why, at room temperature, CO2 is a gas and CS2 is a liquid. You may use diagrams as part of your explanation.
Explanation:
A. Hydrogen bonding is present in CS2 but not in CO2.
B. CS2 has greater dipole moment than CO2 and thus the dipole-dipole forces in CS2 are stronger.
C. CS2 partly dissociates to form ions and CO2 does not. Therefore, ion-dipole interactions are present in CS2 but not in CO2.
D. The dispersion forces are greater in CS2 than in CO2.
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when using vacuum filtration which type of tubing is best?
Answer:
The filter flask and the vacuum trap consist of heavy-walled glassware. You should use thick-walled tubings as well. Normal tubing that you use as water hoses will collapse under vacuum.
For vacuum filtration, thick walled tubings are best as they can withstand the pressure which is applied during filtration.
What is vacuum filtration?It is a filtration technique which works faster .This is because water is suck out the air in the vacuum flask and Buchner funnel by flowing it through the aspirator.
Filter at the bottom separates the solids from the liquids.Solid residue at top of funnel can be easily dried. The filtration takes place effeciently in presence of vacuum .
There is a rubber conical seal which ensures that the apparatus is hermetically closed,maintains vacuum in apparatus and avoids physical points of stresses.
Vacuum filtration is faster than gravity filtration and is more efficient leading to purer liquid. It is of much importance in crystallization.
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