Answer:
true this is correct its your econimically
What evidence do we have that energy levels in an atom are quantized? State and explain the evidence.
Answer:
The first evidence of quantization in atoms was the observation of spectral lines in light from the sun in the early 1800s by Joseph von Fraunhofer and William Hyde Wollaston.
Explanation:
What is found in the outer region of the electron cloud
Which Respiratory organ is responsible for giving oxygen to the bloodstream?
-Bronchi
-Trachea
-Alveoli
-or Larynx?
Answer:
I think that it is Trachea
Can someone help me answer this ASAP!! thank you!
The molecular geometry of molecules is given serially as, tetrahedral,trigonal,tetrahedral,tetrahedral,linear,linear.
What is molecular geometry?Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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Which of the following is a result of intermolecular forces
A. Hydrogen bonds
B. Electronegativity
C. Double bonds
D. Covalent bonds
10. An atom that has 13 protons and 13 electrons is a neutral aluminum (Al) atom. An atom that has 13 protons and 10 electrons is a-
Answer:
An atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other.
For example,
Al atom has 13 protons and 13 electrons. The number of positive and negative charge is equal thus it will be neutral atom.
While the atom of Al which have 13 proton and 10 electron is not neutral. The positive charge is greater than negative by 3. Which means 3 electrons are lose by Al atom and form cation "Al⁺³".
Thus an atom of Al which has 13 protons and 10 electrons is Al cation (Al⁺³)
Answer:
19
Explanation:
Helppp. Calcium reacts with bromine to form Calcium bromide
Ca - - - - > Ca+2
Br2 - - - - > 2br
A. Complete the equation by adding electrons
[tex]\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Chemical Bonding.
Since we know that, calcium shares 2 electrons and Bromide being a halogen accepts 1 electron at a time,
So 2 bromides combine together to form a bond with Calcium, so we get as,
Ca2+ + 2Br -----------------------> CaBr2
CaBr2 is the compound formed.
How do nicotine and tobacco cause cancer?
Answer:
by damaging or changing a cell's DNA
Explanation:
The_____
is an organelle that can give instructions for a
cell to reproduce and send directions to organelles to make needed
materials.
Answer:
nnmnm
Explanation:
Based on the three formulas shown, use one of them to solve for the purple yellow and red box and explain how you did it.
P = 11.133 atm (purple)
T = -236.733 °C(yellow)
n = 0.174 mol(red)
Further explanationSome of the laws regarding gas, can apply to ideal gas (volume expansion does not occur when the gas is heated),:
Boyle's law at constant T, P = 1 / V Charles's law, at constant P, V = T Avogadro's law, at constant P and T, V = nSo that the three laws can be combined into a single gas equation, the ideal gas equation
In general, the gas equation can be written
[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]
where
P = pressure, atm
V = volume, liter
n = number of moles
R = gas constant = 0.08206 L.atm / mol K
T = temperature, Kelvin
To choose the formula used, we refer to the data provided
Because the data provided are temperature, pressure, volume and moles, than we use the formula PV = nRT
Purple box
T= 10 +273.15 = 373.15 K
V=5.5 L
n=2 mol
[tex]\tt P=\dfrac{nRT}{V}\\\\P=\dfrac{2\times 0.08205\times 373.15}{5.5}\\\\P=11.133~atm[/tex]
Yellow boxV=8.3 L
P=1.8 atm
n=5 mol
[tex]\tt T=\dfrac{PV}{nR}\\\\T=\dfrac{1.8\times 8.3}{5\times 0.08205}\\\\T=36.42~K=-236.733^oC[/tex]
Red boxT = 12 + 273.15 = 285.15 K
V=3.4 L
P=1.2 atm
[tex]\tt n=\dfrac{PV}{RT}\\\\n=\dfrac{1.2\times 3.4}{0.08205\times 285.15}\\\\n=0.174~mol[/tex]
What are the basis of making symbols????
Answer:
1/ Using the first letter of the name of the elements.
2/ If the name of two or more elements begins with the same letter,the second letter of their name is also taken with first letter.
3/ Symbols are made by using the letters of the name of elements in other languages also.
Which particle matters the most when it comes to stable atom protons or neutrons?
Answer:
Protons
Explanation:
Protons are worth 1, while neutrons are neutral and are worth zero.
How many inches/second are in
1.73 meters/minute?
A. 68.1 in./s
B. 0.0288 in./s
C. 1.14 in./s
D. 2.64 in./s
Answer:
1.73 meters / minute = 1.14 inches / second
Explanation:
The number of inches present in 1.73 meters/minutes is equal to 1.14 inches/seconds.
What is conversion factor?Conversion factor is a quantity which is get multiplied or divided with an any other given quantity to convert the given quantity into any other quantity.
Given quantity = 1.73 m/min
We know that, 1 meter = 39.37 inches
1.73 m/min = 1.73 × 39.37 = 68.11 inches/min
Also we know that, 1 min = 60 min to convert the above quantity into sec we should divide that by 60 as:
68.11 inches/min = 68.11 / 60 = 1.135 inches/sec (1.14)
Hence the required quantity is 1.14 in./s.
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Ill mark brainleist please helppp
Answer:
rusting, cooking and burning wood
10g of an oxide of copper contains 8.882g of copper. what is empirical formula of the copper oxide
Answer:
Mass of copper oxide: 10g
Mass of copper: 8.882g
Mass of oxygen: 1.118g
Cu O
8.882 1.118
Divide by [tex]A_{r}[/tex] 8.882÷63.5 1.118÷16
0.14 0.07
Divide by the lowest number 0.14/0.07 0.07/0.07
2 1
Check the ratio now, Cu has 2 atoms and O has 1 atom .
The formula is [tex]Cu_{2} O[/tex]
In going across a row of the periodic table, protons and electrons are added and ionization energy generally increases. In going down a column of the periodic table, protons and electrons are also being added but ionization generally decreases. Explain.
Answer:
Explanation:
Ionization energy:
It is the minimum amount of energy required to remove the electron from isolated gaseous atom to make the ion.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell.
When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required. Where as,
When we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
PLEASE ANSWER SOON THIS IS DUE IN LIKE, 5-10 MINS
Which pair have the same electron configuration? You may use the periodic chart
Cl- and Ar
Cl and Ar
Cl- and Ar-
Cl+ and Ar
A mass spectrometer has determined the mass and abundances of all isotopes of an unknown element. The first isotope has a mass of 38.96amu (93.28%) and the second a mass of 40.96amu (6.72%). Calculate the average atomic mass and identify the unknown element, WRITE ONLY THE SYMBOL FOR YOUR ANSWER.
Answer:
I believe it is Potassium (K)
Explanation:
I did the math on a calculator and it was the closest atomic mass to potassium.
water is always subject to the law of
Answer:
motion
Explanation:
i just know things
which three elements have the most similar chemical properties
Answer:
K, Rb and Cs
Explanation:
Answer:
krypton, bromine, and argon
How do molecules move in gas
Answer:
They become fast that they don't touch each other
Explanation:
That's it sorry that I can't help any further
Why are scientists now more excited about sound levitation than they had been previously?
SELECT AN ANSWER
Sound levitation was previously only a theory and has only now been done experimentally.
By using sound levitation at the right frequency, scientists can break objects like glass.
The cost of sound levitation has decreased dramatically over the past decade.
Research has shown scientists can control the movement of liquids with sound without touching the liquid
Answer:
Acoustic tractor beams use the power of sound to hold particles in mid-air, and unlike magnetic levitation, they can grab most solids or liquids even small insects. For the first time engineers have shown it is possible to stably trap objects larger than the wavelength of sound in an acoustic tractor beam. This discovery could enable the manipulation of drug capsules or micro-surgical implements within the body. The discovery could even lead to levitating humans.
Explanation:
Use two analogies to describe quantized change.
Answer:
See explanation
Explanation:
1) A flight of stairs because there is a specific number of steps one may take at a particular time. That is, the number of steps that can be taken at a given time is not continuous.
2) The gear system of a car: The gear system of a car can only take whole number integer values. It is not continuous and only one level of gear can be attained at a given time.
The two analogies that I used to describe quantized change are;
- Notes on a Piano
- Digital Clock
Quantized change is simply means that the change is definite under certain restrictions such as the gears in our cars. This means that change comes in discreet amounts.
The 2 analogies that I can use to describe it are as follows;
1) Notes on a Piano; When we are turn on a piano, the notes on the piano are fixed and as such we can only play the notes that the keys can hit.
2) Digital clock; The representation of time in digital clocks is in terms of numbers which can be said to be discrete variables.
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How much space would one mole of grass take up?
Answer:
If there's a grass area in the shape of a square and one side is 8 metres how much would it cost to fill the grass with fresh gravel at $5/metre
What is the mole fraction of sodium chloride in a solution containing 0.23 moles of NaCl and 5.5 moles of water?
Answer:
0.040
hope this helps :)
Explanation:
NaCI=mol NaCI/mol NaCI+mol H2O
NaCI=0.23 mol/0.23 mol+5.5 mol
NaCI=0.23 mol/5.73 mol=0.040
what are the 3 things needed in photosynthesis
Answer:
Carbon dioxide, water and light are all needed for photosynthesis to take place. Photosynthesis happens in the leaves of a plant.
Explanation:
The simple representation of a compound showing the ratio of elements is the___ formula.
Answer:
Chemical formula
Explanation:
because chemical formulas use chemical elements , symbols , and numbers to present information about the chemical proportions.
explain all ways your atom and symbol for it would change if you removed 2 electrons from the atom
Each atom/element has an electron configuration
The electron configuration shows the energy level of the electron
Each electron configuration has 4 quantum numbers, namely n, l, ml, and ms
n = the principall = the angular momentum / azimuthal ml = the magnetic ms = the electron-spinWe make an example of the element Mg which is in group 2 with the atomic number 12
Electron configuration of Mg: [Ne] 3s² or 1s² 2s² 2p⁶ 3s²
if Mg removes 2 electrons then Mg will form a positive ion (cation) Mg²⁺
This cation is included in the monatomic ion because it is formed from one element (in contrast to the polyatomic ion, which is formed from two or more elements such as SO₄²⁻, ClO₃⁻)
Electron configuration of Mg²⁺ : 1s² 2s² 2p⁶
So atoms can be positively or negatively charged depending on removing or attracting electrons
Molecules are
Group of answer choices
2 elements bound together
2 atoms bound together
2 or more atoms mixed together
2 or more atoms bound together
which terms are used to identify pure substance
Answer:
Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Explanation:
