The model of Neils Bohr postulates that electrons in atoms are found in specific energy levels. Transition from a higher to a lower energy level produces an emission spectrum characteristic of elements.
According to Bohr's model of the atom, an electron in atom exists in distinct energy levels. Electrons can be promoted from lower to higher energy levels when they absorb energy. The electrons are unstable in this higher energy excited state hence they quickly return to the ground state emitting energy. This emission is characteristic of elements.
The following statements are true based on the Bohr model;
Atomic emission spectra are due to electrons losing energy and changing energy levels.Each energy level has a specific energy valueLearn more: https://brainly.com/question/24556237
why do ionic compound are good insulator ?
need a proper answer please
Answer:
Ionic compounds conduct electricity when molten or in aqueous solution, because their ions are free to move from place to place. Ionic compounds cannot conduct electricity when solid, as their ions are held in fixed positions and cannot move.
Explanation:
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Meg ran 100 meters in 7.8 seconds. Linda ran 100 meters in 14.5 seconds. Which statement is correct?
Linda's speed was faster than Meg's speed.
Linda's speed was slower than Meg's speed.
Linda and Meg traveled the same distance at the same rate.
Linda and Meg traveled the same distance over a certain time.
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Answer:
helloo!!!!!!! I am 12 :)
There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?
A. keeping the volume constant and replacing the light particles with heavy particles
B. keeping the pressure constant and increasing the temperature
C. keeping the volume constant and cooling the container
D. keeping the temperature constant and increasing the container volume
There are 300 light particles in an airtight container. The adjustment that would increase the speed of the particle is keeping the pressure constant and increasing the temperature. Option B is correct.
The speed of a particle is the distance traveled by one molecule of a substance. Particles travel as a result of the kinetic energy they possess.
The kinetic energy attributed to each particle rises as the temperature rises.
As a result, in 300 light particles, the particles will travel more quickly when the temperature is increased while the pressure of the particle remains constant.
Therefore, we can conclude that the adjustment that would increase the speed of the particles is keeping the pressure constant and increasing the temperature.
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from the illustration of the potassium atom fill in the periodic table selection
Answer:
2 electrons
8 electrons
8 electrons
1 electron (just count in the rings for these ones)
19 protons (it says "P=19" in the middle. The P stands for Protons)
K (it's from Latin medieval Latin "kalium")
39 (add proton and neutron amounts to get the approximate atomic mass--electrons are negligible)
Explanation:
how do you determine the total number of Valence electrons that are used to make a particular lewis structure for a compound or an ion?
Answer:
The number of valence electrons of an element can be determined by the periodic table group (vertical column) in which the element is categorized.
Explanation:
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Write the electron configuration of a -2 ion with 16 protons.
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6
Explanation:
Number of electrons = Number of protons. Originally, sulfur has 16 protons, but the question asks states 2- ions. So S^(2-), or a total of 18 protons. Follow the rules, and make sure the exponents add up to 18. 2 + 2 + 6 + 2 + 6 = 18 electrons.
why do ionic compound form crystals ?
Answer:
Ions bound together by electrostatic attraction form ionic crystals.Stability of ionic solids depends on lattice energy, which us released in the form of heat when two ions are brought together to form a solid. Lattice energy is the sum of all the interactions within the crystal.Yo can someone explain the heat of fusion and heat of vaporization thing to me?
Answer:
The heat of fusion is the amount of energy required to change a solid into a liquid at its melting point. When a liquid becomes a solid, freezing or solidification has occurred. The heat of vaporization is the energy required to change a liquid into a gas at its boiling point.
Explanation:
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What is the process whereby stars create elements heavier than hydrogen?
atomic growing
atom splitting
nucleosynthesis
hydrogenation
Answer:
nucleosynthesis
Explanation:
The correct answer is nucleosynthesis.
How do stars create heavier elements?After the hydrogen in the star's core is exhausted, the star can fuse helium to form progressively heavier elements, carbon and oxygen, and so on, until iron and nickel are formed. Up to this point, the fusion process releases energy. The formation of elements heavier than iron and nickel requires an input of energy.
What was the process of the formation of heavy elements?In a supernova explosion, neutron capture reactions take place (this is not fusion), leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us comes from stars and supernovae (the heavy elements part).
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At 25 degrees what is the [H+] and pH of a solution with a [OH] = 3.2 x 10^8 M?
Answer:
0.4699
Explanation:
Aluminum reacts with chlorine gas according to the following equation shown below. How many
moles of Cl2 are required to react with 0.062 mol of Al?
2 Al(s) + 3 Cl2(g) → 2 AIC13()
_mol
Answer:
nCl= 0,062x3/2=0,093(mol)
Explanation:
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Fill in the blanks. Liquid B is ____________________ then liquid A and liquid B would ___________________ liquid A.
1: more dense, sink under
2: less dense, sink under
3: more dense, float on top of
4: less dense, float on top of
Answer:
I think it's number one option
What is the word "love" really mean to someone? when do you know when the time is right
The penalty for not voting in New South Wales is a $55 fine. You must respond within 28 days of the issue date of the notice. You will have four options: If you voted, you can provide details of where and when using our non-voter self-service portal.
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Answer:
It's false. We can not alter the formula of the substance involved in a chemical reaction.
Help please!! I thought it was 374.8 but it keeps saying to check my significant digits
Answer:
ok
Explanation:
i am doing now so
A solution made from pure Potassium hydroxide contained 1.85 g of Potassium hydroxide in exactly 200 cm3 of water. Using phenolphthalein indicator, titration of 20.0 cm3 of this solution is carried out v/s sulphuric acid. 9.35 cm3 of sulphuric acid solution is required for complete neutralisation. [atomic masses: K= 39, O = 16, H = 1]
(a) write the equation for the titration reaction.
(b) calculate the molarity of the Potassium hydroxide solution. (c) calculate the moles of Potassium hydroxide neutralised. (d) calculate the moles of sulphuric acid neutralised.
(e) calculate the molarity of the sulphuric acid.
The concentration of H2SO4 is 0.176 M. The number of moles of H2SO4 is 0.0165 moles.
The equation of the reaction is;
2KOH(aq) + H2SO4(aq) ------> K2SO4(aq) + H2O(l)
The number of moles of KOH = 1.85 g/56 g/mol = 0.033 moles
concentration = number of moles /volume
volume = 200 cm3 or 0.2 L
concentration of KOH = 0.033 moles/0.2 L = 0.165 M
From the titration formula;
CAVA/CBVB =na/nb
CA = concentration of acid
VA = volume of acid
CB = concentration of base
VB = volume of base
na = number of moles of acid
nb = number of moles of base
Making CA the subject of formula;
CA = CBVBna/VAnb
CA = ?
CB = 0.165 M
VA = 9.35 cm3
VB = 20.0 cm3
na = 1
nb =2
CA = CBVBna/VAnb
CA = 0.165 M × 20.0 cm3 × 1/9.35 cm3 × 2
CA = 0.176 M
The concentration of sulphuric acid is 0.176 M
From the reaction equation;
2 moles of KOH reacts with 1 mole of H2SO4
0.033 moles of KOH reacts with 0.033 moles × 1 mole/2 moles
= 0.0165 moles of H2SO4
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If I have 1000ml of water and 10 ml of water, which will have the greater density? Why?
Answer:
1000 ml
Explanation:
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Answer:
1000 ml because the bigger ml the greater density brainliest pls
Which of these mixture is a solution
Answer:
A. Sugar and water
Explanation:
Because water can dissolve sugar
What element does “X” represent in Figure 1?
Helium
Krypton
Neon
Argon
Answer:
Argon
Explanation:
It's atomic number is 18
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what is the difference between an element and an isotope
Answer:
An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.
Explanation:
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Answer: Elements are simply what you see on the periodic table. E.g. carbon, oxygen, hydrogen etc. Isotopes are elements with different masses. ... So isotopes have the same amount of protons but with different amounts of neutrons.
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Can anyone help me with this?
Answer:
Label 2
Explanation:
Earth is about 2/3 of the way up the Orion Arm of the Milky Way Galaxy
A rectangular block weighs 121g. The dimensions of the block are 9.1cm by 5.4cm by 2.3cm. From this data, what us the density of the block in g/mL? Will tge block float or sink in water and how do you know? Show all your work on a piece of paper.
The density of the rectangular block is 1.07 g/mL.
From the question, we have the mass of the rectangular block as 121g
The dimensions of the block are given as follows;9.1cm by 5.4cm by 2.3cm
So we have the volume of the block as; 9.1cm × 5.4cm × 2.3cm = 113 cm^3
Let us recall that; 1 cm^3 = 1 mL, so 113 cm^3 = 113 mL
Having said that, we must also remember that;
Density = Mass/volume
Density = 121g/113 mL
Density = 1.07 g/mL
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Which option would be an appropriate model of nuclear fission?
A. dividing a stack of paper equally between two people
B. taking a teaspoon of sugar from a bowl
C. disturbing a drop of water such that it breaks into smaller droplets
D. cutting a cake in half
Answer:C
Explanation:
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If F1 is equal to F2 and F4 is greater than F3, which statement is correct?
An unbalanced force will move the box up.
An unbalanced force will move the box down.
Several balanced forces will keep the box stationary.
Several balanced forces will keep the box moving towards the right.
"An unbalanced force will move the box down"
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Calculate the mass percent of H in C3H8O3.
%
Answer:
because of it being that you have inferno dragon plsss
What are some key properties of metalloids?
Explanation:
Metalloids have a solid state of matter. In general, metalloids have a metallic luster. Metalloids have low elasticity, they are very brittle. Middleweight are semi conducted elements, and they allow leave the average transmission of heat.Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Which statement best describes these three components of air?
O Oxygen, nitrogen, and carbon dioxide are all classified as pure substances.
Oxygen, nitrogen, and carbon dioxide cannot react with another substance.
Oxygen, nitrogen, and carbon dioxide are chemically bonded to one another.
O Oxygen, nitrogen, and carbon dioxide can be classified as elements.
idio
Answer:
option A
Explanation:
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HELP!! please choose all the correct answers, picture attached
Answer:
Only C. is wrong else every option is correct.
Explanation:
Hope this helps you. If you want explanation then ask in comments. Good luck!