Answer:
Its D
Explanation:
Ali is using a specialized headphone that cancels the extra noise in the atmosphere.
Megan is using a transmitter to convert electrical signals into radio waves.
Kristoff is using a microphone to convert sound waves into the electrical signals.
Jenna is using the radio to convert radio waves into sound waves.
Answer:
D. Ali is using specialized headphones, Megan is using a transmitter, Kristoff is using a microphone, and Jenna is using a radio.
Explanation:
Describe the energy of the products in comparison to the energy the atoms had when the were wandering around the room free.
Answer: The atoms of the solid products are tightly packed whereas those in gas are loose.
Explanation:
Atoms in the solid structure are linked to each other by strong force of attraction and they collectively form an three-dimensional structure. The binding of the atoms form the shape of the solid product. The gas exhibit free atoms in it. The atoms are not linked to one another by strong force of attraction. The atoms as a part of gas have higher energy as those present in the solid products. So, the atoms of the gas wander freely as compared to those in the solid products.
Picture a neutral Satom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
ASAP PLEASEE
Answer:
it will have 6 valence electrons
it will gain electrons
charge will be 2-
Q1.
How many peaks are there in the 13C NMR spectrum of 1,4-dimethylbenzene?
A: 8
B: 4
C: 3
D: 2
Answer:
there are four peaks in the 13c NMR (B)
To solve this we must be knowing each and every concept related to NMR. Therefore, the correct option is option B among all the given options.
What is NMR?NMR spectroscopy is a form of spectroscopy that may be used to evaluate the quality or purity of such a sample as well as the molecular weight of a substance.
It really is based on the observation that now the nuclei among most atoms have spin and that all nucleus are electrically charged. NMR spectroscopy relies on the electromagnetic radiation absorption in the radiofrequency range 3kHz-300 GHz. There are four peaks in the 13C NMR spectrum of 1,4-dimethylbenzene.
It occurs at such a wavelength that corresponds to radio frequencies, and when an electron recovers from such an excited state back ground state, it produces the same frequency radio wave.
Therefore, the correct option is option B.
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When silver nitrate (AgNO3) dissolves in water, the temperature of the solution decreases.
Explain your answer
Answer:
The enthalpy of solution for AgNO3 is positive because the temperature of the solution decreases (the dissolution is endothermic). Hsol = Hsolute + Hsolvent + HmixHsolute and Hsolvent are endothermic because energy is required to overcome intermolecular forces and separate solute and solvent particles.
Answer:
the enthalpy of solution for agno3 is positive because the temperature of the solution decreases. (the dissolution is endothermic.)
Delta H sol=delta HSolute +delta H solvent +delta H mix
HSolute and H solvent are endothermic because energy is required to overcome intermolecular forces and separate solute and solvent particles.
H mix is exothermic because energy is released when intermolecular forces form between solute and solvent particles.
if the overall enthalpy of solution is positive, then HSolute + H solvent must be larger in magnitude than H mix.
Explanation:
correct on edge2021
In a lab, a scientist mixes a purple powder-like substance and a clear liquid together. The scientist observes that the two substances begin combining together, and he notices a gas begin to bubble out of the mixture. Did the scientist witness a chemical reaction? Why or why not?
The scientist witnessed a chemical reaction because a gas was evolved when the two substances were mixed.
A chemical reaction is the same as a chemical change. When a chemical change occurs, atoms recombine to form new substances. Certain occurrences may accompany a chemical reaction such as;
Change in colorEvolution of gasAppearance of a solid in an aqueous phase reactionSudden change in the temperature of the system.When the scientist mixed purple powder-like substance and a clear liquid together, he noticed that a gas began to bubble out of the mixture. This implies that new substance has been formed so a chemical reaction has taken place.
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What is the percent by mass of water in the hydrate CoCl₂ · 6H₂O?
Answer:
You'll get 52.17%
Explanation:
Which of the following is true? Electrons are shared in ionic bonding
Answer:
The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. ... In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
Explanation:
Name the element which has twice the number of electrons in its second shell as in the first shell write it's electronic configuration also.
Which structures join with the cell’s membrane during exocytosis?
Answer:Exocytosis is also used to integrate new proteins into the cell membrane. In this process, the new protein is formed inside the cell, and migrates to phospholipid bilayer of the vesicle. The vesicle, containing the new protein as a part of the phospholipid bilayer, fuses with the cell membrane.
Explanation:
Which of the following questions will allow you to determine if a population of organisms are MOST LIKELY a result of natural or artificial selection? A. How similar are the organisms to their parents? B. How many different traits are there in the population of organisms? C. Do the organisms have traits that are valuable to humans but are poorly suited to the wild? D. Were the organisms produced by sexual or asexual reproduction?
Answer:c
Explanation:
A) lizard
B) salamander
C) mouse
D) pigeon
Heavier noble gases are able to form compounds with other elements under specific conditions because their valence ____are farther from the _____
Answer:
Heavier noble gases are able to form compounds with other elements under specific conditions because their valence electrons are farther from the nucleus.
Explanation:
The name of noble or inert gas is due to the lack of reactivity with other elements. This is due to its electronic configuration, because its outermost shell or valence shell is always complete, without the need to share, give or receive electrons forming bonds. That is, its outer layer is so stable that the element tends not to react with others except in very specific cases.
These exceptions generally involve the heavier noble gases, such as xenon or radon, capable of forming compounds with fluorine and oxygen. This is because the heavier noble gases have more electron shells than the lighter ones. This characteristic causes the outermost electrons to experience a "shielding" effect due to the action of the inner electrons, and they can then be ionized more easily, since the attraction they receive from the positive charges of the nucleus is weaker. That makes the ionization energy low enough to form stable compounds with more electronegative elements, such as fluorine and oxygen.
Heavier noble gases are able to form compounds with other elements under specific conditions because their valence electrons are farther from the nucleus.
the speed of sounds depend on
Answer:
medium in which it is traveling
Explanation:
i hope it helps u
All elements in this series are radioactive
Answer:
you did not posted the series
Explanation:
You are given 0.39 mol of niobium (Nb). How many grams of niobium do you have?
Answer:
36gNb
Explanation:
0.39 mol Nb*92.91g Nb/1 mol Nb=36 g Nb
Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of
How many protons, electrons, and neutrons are in calcium?
Answer:
20 protons , 20 electrons and 20 neutrons
9
Which statement best describes the Bohr model of the atom?
Electrons can move freely between intermediate energy levels.
B
Electrons move around the nucleus in circular orbits:
С
Electrons emit and absorb energy at continuous wavelengths.
D Electrons are accommodated in lower energy levels.
Answer:
B.electrons move around the nucleus in circular orbits.
3. What causes the plates to be pulled apart?
PLEASE HELP
Answer:
Hot magma rises from the mantle at mid-ocean ridges pushing the plates apart. Earthquakes occur along the fractures that appear as the plates move apart.:
changing the number of _______ makes an atom stable or unstable and creates different isotopes of the same element with a different ______ (pick two that best fits.)
a.) atomic mass
b.) atomic number
c.) protons
d.)neutrons
e.)electrons
f.) ion
g.)neutral
The neutrons are the neutral sub-atomic particles present in the nucleus. The variation in the number of neutrons produces isotopes that have different atomic mass. Thus, options 1. d and 2. a are correct.
What is an isotope?An isotope is said to be an atom of an element that have a different atomic mass but the same atomic number due to the variation in the neutrons in the nucleus. The neutrons have a neutral charge that makes the atom stable.
When a neutron is added or lost it makes the nucleus of the atom unstable leading to radioactive decay. The isotopes have the same constant number of protons in their nucleus.
The atomic number of the atom remains the same due to the stable proton number but varies the atomic mass due to the change in the number of neutrons.
Therefore, options d and a. neutrons and atomic mass are the correct blanks.
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Which of the following is not an organ in the nervous system?
Write the word and balanced chemical equations for the reaction between:
Aluminum + iron sulfate
Explanation:
Aluminium - Al
Iron Sulfate - FeSO4
The reaction is given as;
Al + FeSO₄ --> Al₂ (SO₄) ₃ + Fe
The balanced equation is given as;
2 Al + 3 FeSO₄ --> Al₂ (SO₄) ₃ + 3 Fe
In words it is given as;
Aluminium + Iron Sulfate --> Aluminium Sulfate + Iron
(iii) Observe the following diagram and answer the following questions :
X Х
Y
(A) Identify elements X and Y.
(B) Do these elements belong to the same group?
(C) Which element is more electropositive in nature? Why?
ANSWER ASAP GIVING BRAINLIEST FIVE STARS AND A HEART!!!
Write a paragraph that explains the differences among incandescent, fluorescent, and laser light.
Answer:
An incandescent light bulb works by heating a filament in the bulb. Fluorescent light is a bright light produced by electricity flowing through a tube filled with ionized gas. Fluorescent light bulbs are more energy-efficient than incandescent bulbs.
Explanation:
100 POINTS PLS HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
i need this im struggling with my work
Explanation:
Last one and the first
83.0 g Lithium Cyanide (LiCN)
calculate this to molar mass and moles. Please
Answer:
32.958 g/mol
2.52 moles
Explanation:
Finding the molar mass:
Use the periodic table to determine the masses of each element
6.94+12.011+14.007=32.958 g/mol
Moles:
83 g*1 mol/32.958 g = 2.5183566964 moles
[tex]\\ \sf\longmapsto LiCN[/tex]
[tex]\\ \sf\longmapsto 7u+12u+14u[/tex]
[tex]\\ \sf\longmapsto 21u+12u[/tex]
[tex]\\ \sf\longmapsto 33u[/tex]
[tex]\\ \sf\longmapsto 33g/mol[/tex]
Given mass=83gNo of moles=Given Mass/Molar mass[tex]\\ \sf\longmapsto \dfrac{83}{33}[/tex]
[tex]\\ \sf\longmapsto 2.5mol[/tex]
Two tennis balls are dropped at the same time. One tennis ball is dropped from the roof of a two-story house. The other tennis ball is dropped from 1 m off the ground. Which tennis ball will be moving the slowest as it hits the ground? Why?
Energy that is stored is called potential energy. Take a round ball that is at rest at the top of the hill. The ball has a lot of potential energy, but no kinetic energy because it is not moving. Once the ball is released and it begins to roll, the potential energy the ball had initially is transformed into kinetic energy. The higher the ball is placed, the ____ potential energy it will have.
A-more B-less
Ummm help? From start to finish
What will happen to the temperature
when KCI is added to water?
Answer:
As potassium chloride (KCl) dissolves in water, the ions are hydrated. ... Ion-dipole forces attract the positive (hydrogen) end of the polar water molecules to the negative chloride ions at the surface of the solid, and they attract the negative (oxygen) ends to the positive potassium ions.
