Answer:
20.0
Explanation:
The region around a nucleus in which electrons are likely to be found is called the
(1 point)
O pudding
O empty space
O atomic orbital
atomic orbit
please what is the formula for finding mole and give a worked example
Answer:
see explanation
Explanation:
number of moles = mass ÷ relative formula mass
e.g.
Calculate the number of moles of carbon dioxide molecules in 22 g of CO2.
Ar (relative atomic mass) of C = 12, Ar of O = 16
Mr (relative formula mass) of carbon dioxide = 12 + 16 + 16 = 44
number of moles = 22 ÷ 44 = 0.5 mol
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
I will make you brainless just answer this all pleasee
A. If the statement is true, write T; if the statement is false, write F.
am not sure
Explanation:
1T
2T
3T
4F
5F
6F
7F
8T
9T
10T
Please tell me the answer, I will mark the first person to answer brainlist
Answer:
there would be not movement.
The photoelectron spectrum for the element nitrogen is represented above. Which of the following best explains how the spectrum is consistent with the electron shell model of the ato
f the atom?
A. The leftmost peak represents the valence electrons.
B. The two peaks at the right represent a total of three electrons.
C. The electrons in the ls sublevel have the smallest binding energy
D. The electrons in the 2p sublevel have the smallest binding energy
Answer:
D. Is the correct option.
Explanation:
2p level contains the electrons furthest from the nucleus in the case of Nitrogen thus it's much easier to disperse/remove the electrons from the shell due to low pull of nucleus energy.
The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
What is photoelectron spectrum?
Photoemission spectroscopy also known as photoelectron spectroscopy which photoelectric effect is the process in which electron are get energy from external source of energy like sunlight deals with energy measurement of energy emission or electrons emitted from solids, gases or liquids by the process of photoelectric effect,
Photoelectric effect is the process in which electron are get energy from external source of energy like sunlight and get excited and comes in excited state from the ground state due to this process continuos flow of electron is take place and after that flow of energy is takes place.
Therefore,The best explanation of how the spectrum is consistent with the electron shell model of the atom is the electrons in the 2p sub level have the smallest binding energy. Thus, option D is correct.
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PLEASE HELP !
How does the chemical structure of ionic liquids make them more flexible for scientists to use and what will most likely be the first industrial application of them?
Explanation:
Ionic liquids offer numerous advantages over conventional organic solvents for carrying out organic reactions, Malhotra notes. "In many cases, product recovery is easier, catalysts can be recycled, and the ionic liquids can be reused," he says. "In addition, their thermodynamic and kinetic behavior is different.
Which factor of production would tools fall under?
A) Land
B) Labor
C) capital
D) entrepreneurship
Answer:
Capital (20 characteristics nanaman bago masend sagot)
Answer:
C) capital
Explanation:
a) Give the reaction that occurs when 1 gram of sodium is added to 100 ml of ethanol.
b) This solution is then heated with 5 grams of 1-bromobutane. What is the maximum yield of the final product from this reaction?
what happens to the pressure of a gas if its volume is reduced?
Answer:
When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. This is shown by the following equation - which is often called Boyle's law. ... It means that for a gas at a constant temperature, pressure × volume is also constant.
Explanation:
may i have the brainlyest
Answer:
When the volume decreases, the pressure increases. This shows that the pressure of a gas is inversely proportional to its volume. ... It means that for a gas at a constant temperature, pressure × volume is also constant.
Explanation:
what if water didnt have a negative charge?
Explanation:
The water molecule has a tiny negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms due to the unequal sharing of electrons.
What isotope forms when radon-215 emits two alpha particle and three gamma rays
How many grams of H2O is needed to produce 0.75 moles of HCL ?
2 moles of HCl solution reacts with one mole Calcium Hydroxide
Ca
(
O
H
)
2
One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.
One mole of Ca
(
O
H
)
2
has mass 74.1 g
as per equation; 73 g of HCl reacts with 74.1 g of Ca
(
O
H
)
2
1g of HCl reacts with 74.1g / 73 of Ca
(
O
H
)
2
1g of HCl reacts with 1.015 g of Ca
(
O
H
)
2
cho 13,5g nhôm tác dụng với dd HCl dư.Tính khí H2 (đktc) thu được
2Al+6HCl ->2AlCl3+3H2 .nAl=m/M=13,5/27=0,5(mol) =>nH2=0,5.3/2=0,75(mol)....VH2=n.22,4=0,75.22,4=16,8(lít)...
the range of all forms of radiant energy is called the
Answer:
I think its electromagnetic spectrum
Answer:
Radiant energy is energy that travels in waves and can travel through space. The sun gives off radiant energy and is important here on earth for many natural processes to occur. The electromagnetic spectrum is the range of all forms of radiant energy from gamma rays to radio waves.
Explanation:
What is the significance of the color of the light observed in a line spectrum?
Answer:
When excited electrons fall back to the ground state, they release energy in the form of photons of light. These photons of light create the colors observed in a line-emission spectrum.
Explanation:
How much heat is needed to raise a 0.30 g piece of aluminum from 30.C to 150C? The specific heat of aluminum 0.900j/gC
Answer:
hi
Explanation:
Help me pls I will mark you as brain
Answer:
I,II and III
Explanation:
Hope this helps :)
Answer:
l and III is the answer.
hope it hepls
why should you never place a hot object on the pan of a balance
Answer:
Because, it would make the pan hot and if it's plastic then it would melt. if it was metal it might make the metal piece hot and you'd risk burning yourself.
Explanation:
You should never place a hot object on the pan of a balance because it can cause the balance to become inaccurate and affect the measurement results.
Balances are precision instruments used to measure the mass of objects with high accuracy. The balance pan and its components are designed to operate under specific conditions, including a stable temperature. When you place a hot object on the balance pan, several issues can arise:
Thermal Expansion: Materials, including metals and plastics, can expand when exposed to heat. Placing a hot object on the pan can cause the pan and its supporting components to expand, potentially affecting the balance's calibration and accuracy.
Uneven Heating: If the hot object is not uniformly heated, it can cause uneven expansion of the balance pan. This can lead to imbalanced weight distribution and inaccurate measurements.
Calibration Shift: The heat from the hot object can cause the materials in the balance to change temperature rapidly, potentially affecting the calibration of the instrument. The balance may require time to stabilize before accurate measurements can be obtained.
Damage to the Balance: Exposing the balance pan to extreme heat can cause warping, cracking, or other structural damage to the pan material. This can permanently impair the balance's performance and accuracy.
To ensure accurate measurements and maintain the integrity of the balance, it's important to allow hot objects to cool to room temperature before placing them on the balance pan. Additionally, using appropriate containers or holders designed for high-temperature applications can help prevent damage to both the hot object and the balance equipment.
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Answer the question below. Use the rubric in the materials for help if needed.
Compare and contrast ionic and covalent bonds by explaining what the electrons do when bonding occurs. Use details to support your answer.
Answer:
..
...
....
Explanation:
hop it helps.....
Using the periodic table, calculate the number of protons, neutrons, and electrons for Calcium, Argon, and Bromine.(Ca,Ar,Br)
Answer:
Calcium has 20 protons 26 neutrons and 20 electrons.
argon has 18 protons
22 neutrons and 18 electrons
Bromine has 35 protons 44 neutrons and 35 electonrs
Explanation:
good luck with your homework hope I helped
What is the charge of Cl2?
Answer:
Cl2 does not have any charge
Explanation:
But when it is present in its ionic form then chlorine have -1 charge on it. But charge on chlorine varies from -1 to +7
Rocks can be classified based on texture. The size of the grains in a rock affects its texture. Coarse-grained rocks have large grains, and fine-grained rocks have small grains.
Rocks formed from magma under Earth’s surface have larger grains than rocks formed from lava on Earth’s surface. This is because magma cools slower underneath the ground than it does above ground.
What kind of rock is this?
A.Igneous
B.Metamorphic
C.Sedimentary
Where would this rock most likely be formed?
A. Along the sides of a volcano
B. On the ocean floor"
C.underneath the Earths surfaces
To which group of rocks would this rock belong?
A. Coarsed-Grained Rocks
B. Fine-Grained Rocks
C. Non-Grained Rocks
1. is Igneous rock
2. is underneath Earths surface
3. is Coarsed-grained
hope this help!!^^
The kind of rocks is igneous rocks formed along the sides of volcano and are coarsed-grain rocks.
What are igneous rocks?
Igneous rocks are one of the three main rock types the other two including sedimentary and metamorphic rocks.These rocks are formed by cooling and solidification of lava or magma.
The magma is derived from partial melts in the planet's mantle or crust.Melting is caused by increase in temperature or decrease in pressure or even change in composition.Solidification occurs either below surface which is called as intrusive rocks or on the surface as extrusive rocks.
They are classified according to their texture,mode of occurrence,chemical composition,geometry and mineralogy of rock.The two important variables for classification are mineral composition and cooling history.
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How many moles of Ag contain 4.49 x 1023 atoms Ag?
Answer:C, 0.746 mol Ag.
1 mol Ag = 6.022 x 1023 atoms of Ag -> 4.49 x 1023 atoms of Ag x 1mol Ag/6.022 x 1023 atoms -> 0.746 mol Ag
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.746 mol of Ag contain 4.49 x 10²³ atoms Ag.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
given number of atoms of Ag=4.49 x 10²³ atoms
Substituting the values
mole= 4.49 x 10²³ ÷ 6.022×10²³
mole = 0.746 mol
Therefore, 0.746 mol of Ag contain 4.49 x 10²³ atoms Ag.
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Can someone help me to write the ionic equation :((
Answer:
Here use this to help you
Explanation:
what non metal is used in the process of vulcanization of rubber
Answer:
Sulphur
Explanation:
Sulphur evolves the elastics of rubber, therein by heating it to make it...Hot.
a caterpillar travels across the length of a 3.00 m porch in 10.5 minutes. what is the average velocity of the caterpillar in m/s?
Answer:
3.5 meters per second
Explanation:
10.5 divided by 3 equals 3.5
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:
What does it mean to say that a wave is cyclic, or periodic, disturbance?
Answer:
Wave is a disturbance or energy that propagate through medium from one point to other point
So basically it is a flowing energy that flows into the medium and hence medium particles start oscillating about their mean position to and fro.
This motion of medium particles or this to and fro motion is about their mean position and this will always be cyclic or periodic motion
This means the disturbance or energy continuously flow through the medium such that it will change the position of medium particle and this will be cyclic in order
For an example
y(x,t) = Asin(kx - ωt + φ)
So here above equation of wave is a travelling wave in which displacement of medium particle from its mean position is given by "y"
Now we can see that this disturbance depends upon the sine function and it will repeat its same position after every 2 pi time interval as it is cyclic function for this value
Due to this phenomenon of repetition of its same position we can say that it is disturbance of wave is cyclic.
Explanation:
Janna, a student of a chemistry class, told her friend that she learnt in class that bottled water is not pure. Kim, her best friend, refused to believe Janna, referring to phrases on the label of the bottle such as “purified drinking water”, “from the purest springs”.
Plan and design an experiment to prove or disprove Janna’s claim
Form an Hypothesis?
A hypothesis that could prove or disprove Janna’s claim is; bottle water is pure water hence it boils at 100°C.
Pure water is water that contains only hydrogen and oxygen and nothing else. Impure water contains other substances apart from hydrogen and oxygen in a ratio of 2:1.
The hypothesis of our experiment is that;" bottle water is pure water hence it boils at 100°C." A hypothesis is a tentative explanation for an observation.
We can carry out the experiment by bringing about three samples of the bottled water and insert a thermometer in each of the samples then record the initial temperature of the water. The samples are then heated to boiling point and the boiling point of each sample is recorded.
If the sample boil at exactly 100°C then the hypothesis is proven or vice versa.
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