Answer:
Explanation:
Neils Bohr in 1913 put forward his own model of the atoms based on the quantum mechanics originally developed by Planck.
He assumed the Rutherford's model and suggested that the extranuclear space consists of electrons in specific spherical orbitals around the nucleus. His predecessors and contemporaries did not give this perspective to the atomic model. The orbits/energy levels are designated by letters K, L, M, N .... The maximum number of electrons that can be accommodated by an energy level is 2n² where n is the principal energy level.Answer:
It showed that electrons could jump from one path to another
Explanation:
quiz
List four greenhouse gases in the atmosphere. For each gas, describe its prevalence in the atmosphere, its natural sources, its human-induced sources, and how its concentration in the atmosphere might be changing.
Answer: Carbon Dioxide, Methane, Nitrous Oxide and Fuorinated Gases
Explanation:Carbon dioxide (CO2): Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement). Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.
Methane (CH4): Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from livestock and other agricultural practices and by the decay of organic waste in municipal solid waste landfills.
Nitrous oxide (N2O): Nitrous oxide is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, as well as during treatment of wastewater.
Fluorinated gases: Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are synthetic, powerful greenhouse gases that are emitted from a variety of industrial processes. Fluorinated gases are sometimes used as substitutes for stratospheric ozone-depleting substances (e.g., chlorofluorocarbons, hydrochlorofluorocarbons, and halons). These gases are typically emitted in smaller quantities, but because they are potent greenhouse gases, they are sometimes referred to as High Global Warming Potential gases ("High GWP gases").
1. Which term best describes ultraviolet radiation?
a. Harmless
b. Invisible
c. Undetectable d. Beneficial
In the name carbon dioxide what does the prefix of the second word indicate about a molecule of a dioxide A. It has two carbon atoms B. It has two oxygen atoms C. It is a polyatomic ion D. It Is an ionic bond
Answer:
The answer is option B, that is, it has two oxygen atoms.
1.How many miles of water does a raindrop contain if it has a mass of 0.060g?
2.What mass of water would you need to have 15 moles of H20?
3.A container of Trader Joe’s sea salt contains 750 grams.How many miles of sodium chloride (NaCl) is this?
4. A cake recipe calls for 0.080 moles of baking soda (NAHCO3).What mass should the chef measure out?
5. The chemical formula for rust is Fe203. If the total mass of rust on a 1967 Chevy corvette is 190 kg, how many moles is that?
Answer:
1. 0.0033 moles of water.
2. 270g of water
3. 12.8g NaCl
4. 6.72g NaHCO3
5. 1190moles Fe2O3
Explanation:
To convert moles to grams or vice versa we require tu use molar mass of the substance as follows:
1. Molar mass water: 18g/mol
0.060g * (1mol / 18g) = 0.0033 moles of water
2. Molar mass water: 18g/mol
15 moles H₂O * (18g / 1mol) = 270g of water
3. We can assume all sea salt is NaCl -Molar mass: 58.44g/mol-
750g NaCl * (1mol / 58.44g) = 12.8g of NaCl
4. Molar mass NaHCO₃: 84g/mol:
0.080mol * (84g/mol) = 6.72g NaHCO3
5. Molar mass Fe2O3: 159.69g/mol:
190kg = 190000g * (1mol / 159.69g) = 1190moles Fe2O3
Question 10 (1 point)
What is the name for MnO?
manganese oxide
manganese (II) oxide
manganese (IV) oxide
manganese (VI) oxide
Answer:
D it is D
Explanation:
Cobalt-60 decays into nickel-60 via beta decay with a half-life of 5.27 years. A purse sample of cobalt-60 is prepared, with no contamination of other isotopes. After 5.27 years, what is the ratio of cobalt-60 to nickel-60 in the sample?
Answer:
1:1
Explanation:
Since that is it's half life.
PLZ HELP!
How does changing the angle of a ramp affect the force required?
Answer:
depending on how you change the angle on the ramp the kanetic energy can go up or down depending on how u angle the ramp
Explanation:
write the chemichal formulae of the following compounds.1) Ammonium chloride2) calcium hydroxide
List the 3 particles of an atom (w/their symbol & charge)
Proton p +1
Neutron n 0
Electron e- -1
A student viewed the moon through binoculars one week after a new moon.Which image shows the phases of the moon that the students observed?
Answer:The answer is D
The image that shows the phase of the moon one ( 1 ) week after the new moon is ; ( Image G )
The quarter at which the moon will be one(1) week after the new moon is up in the sky is the first quarter. And at the first quarter the moon will be in its " waning gibbous " phase.
The waning gibbous phase is the stage in the new moon cycle where only one half ( 1/2 ) or 50% of the moon is lit and the moon will remain in this stage up until 21 days.
Hence we can conclude that the image that shows the phase of the moon one week after the new moon is Image G.
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How many oxygen atoms are in 163 g of aluminum sulfate? 
Answer:
3.44 × 10²⁴ atoms of oxygen
Explanation:
Step 1: Calculate the moles corresponding to 163 g of Al₂(SO₄)₃
The molar mass of Al₂(SO₄)₃ is 342.15 g/mol.
163 g × 1 mol/342.15 g = 0.476 mol
Step 2: Calculate the molecules in 0.476 moles of Al₂(SO₄)₃
We will use Avogadro's number: there are 6.02 × 10²³ molecules of Al₂(SO₄)₃ in 1 mole of Al₂(SO₄)₃.
0.476 mol × 6.02 × 10²³ molecules/1 mol = 2.87 × 10²³ molecules
Step 3: Calculate the atoms of O in 2.87 × 10²³ molecules of Al₂(SO₄)₃
According to the chemical equation, the molar ratio of Al₂(SO₄)₃ to O is 1:12. The atoms of O are 12/1 × 2.87 × 10²³ = 3.44 × 10²⁴.
PLEASE HELP! SEE ATTACHED!
Answer:
Ans => C => 43.3%
Explanation:
2CO + O₂ => 2CO₂
Given 1g CO = 1g/28g·mol⁻¹ = 0.036 mol CO
b/c coefficient of CO = coefficient of CO₂ => moles CO₂ = 0.036 mol = 0.036mol x 44g/mol = 1.57 gCO₂ (theoretical yield)
%Yield = (actual yield/theoretical yield) x 100% = (0.68g/1.57g) x 100% = 43.3%
Predict the balanced insoluble product for the reaction of lead(III) nitrate with ammonium chloride. GIVE ME THE ANSWER NOT A LINK
Answer: [tex]Pb(NO_3)_2(aq)+2NH_4Cl(aq)\rightarrow PbCl_2(s)+2NH_4NO_3(aq)[/tex] .
The insoluble product is lead (II) chloride.
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]Pb(NO_3)_2(aq)+2NH_4Cl(aq)\rightarrow PbCl_2(s)+2NH_4NO_3(aq)[/tex]
The insoluble product is lead (II) chloride.
What are two uses of sulfur?
Answer:
It's used in the vulcanisation of black rubber, as a fungicide and in black gunpowder and a production of sulfuric acid.
Explanation:
(QUICK PLEASE!)
When you walk, your foot pushes down on the ground. What is the response of the ground?
Nothing?
It holds your foot?
It pushes with equal force on your foot?
It pushes with more force against your foot.
Answer:
It pushes back with equal force.
Explanation:
This is pretty much newton's first law.
The term "alchemy" refers to early pseudoscientific attempts to transform common
elements into more valuable elements (such as lead into gold), For one kind of atom to
become another kind of atom, which particle(s) of the atom need to be expelled or gained?
Proton
Electron
Neutron
Quantum Particles
Answer: The correct answer is option B. electron.
Explanation:
There are 3 subatomic particles:
Electrons: They carry negative charge and are present in orbits around the nucleus of an atom.Protons: They carry positive charge and are present inside the nucleus of an atomNeutrons: They does not carry any charge and are present inside the nucleus of an atom.An atom forms an ion, when it looses or gains an electron.
When an atom looses electron, it form a positive ion known as cation.When an atom gains electron, it form a negative ion known as anion.Hence, the correct answer is option B. electron.
The particle(s) of the atom that is needed to be expelled or gained in an alchemy process which involves transformation of one element into valuable elements or atom to another is B:Electron.
Alchemy can be regarded as branch of philosophical and protoscientific tradition that is traceable to China, and Europe. In the process of transformation of one element to another useful element or compounds , there is usually transfer of electron.Electronegative element like chlorine usually gain electron and are anion, while electropositive elements like potassium will loose electron( cation) all involves the transfer of electron.
Therefore, option B is correct.
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anyone know how to do this?
Answer:
2X₂Y₃ → 4X + 3Y₂
Explanation:
This problem is about balancing chemical equations.
The reaction is given as:
X₂Y₃ → X + Y₂
To balance the reaction equation, we use a mathematical approach.
aX₂Y₃ → bX + cY₂
Conserving X; 2a = b
Y; 3a = 2c
Now, let us make a = 1
b = 2
c = [tex]\frac{3}{2}[/tex]
Multiply through by 2;
a = 2, b = 4 , c = 3;
2X₂Y₃ → 4X + 3Y₂
If 24 moles oxygen gas combined with 24 moles hydrogen gas, what would be the limiting reactant?
I’m learning about heredity
1. How can environment influencers inherited traits
2. How many chromosomes do humans have? Explain where these chromosomes come from.
Answer:
1. (See explanation)
2. 46. 23 from the mother’s egg and 23 from the father’s sperm.
Explanation:
ok for number one I am not entirely sure, but I am pretty sure that light, chemicals and temperature can all affect which genes get turned on and off. I am not entirely sure if the question is asking about the environment influencing inherited traits in the form of natural selection tho? If that is something you’re seeing right now, it might be a possible answer. But honestly I am not completely sure.
mg(oh)2
How many H atoms are there?
How many Mg?
What is the total number of atoms?
No one answers my Questions :(
Please help its my last one:
Name three sources of atmospheric carbon dioxide. (Write in complete sentences and be very detailed.)
This is science.
First and best answer gets 5 stars, a thanks, and a brainliest!
Doing this because I know I'm kickass at Chemistry.
One source would be human emissions. As humans, we use a lot of machines (like power plants) that produce large amounts of carbon dioxide into the atmosphere. The ocean also produces a lot of carbon dioxide via the evaporation cycle. Polluted waters eventually will go into the atmosphere. Volcanoes, even when not erupted, emit a lot of carbon dioxide as well. Dormant underground magma releases carbon dioxide through the Earth's pores, and even when a volcano erupts, it produces carbon dioxide as well.
what does our life have in common with the periodic table, What is the relationship between the world around us and the periodic table?
Answer:
Summary. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
Explanation:
True or False, plz don't answer if you don't know the correct answer
Answer:
The answer is true
Explanation:
Hope this can help
Which of the following is a definition of a line segment?
Answer: So, a line segment is a piece or part of a line having two endpoints. Unlike a line, a line segment has a definite length.
Explanation:
Answer:
a line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints.
Please select the word from the list that best fits the definition.
Science lab, bring water and sodium
a) term calendar
b) weekly schedule
c) daily organizer
Answer:
C. Daily Organizer. Also called an agenda. We usually write notes in them for school related things so the answer is pretty self explanatory.
hi can someone help me
Answer:
yolo go with C
Explanation:
WHICH COMPOUND HAS BONDS WITH THE LEAST DEGREE OF POLARITY (LEAST POLAR)?
Explanation:
H−S has least polarity in the bond because the electronegativity difference between H and S is the least.
Where in the ATOM are the protons and neutrons found?
I
Answer:
in nucleus atom of proton and netwon found
s. What happens
the heat
from
the heat source?
Why do longer wavelengths are considered to have lower frequencies? Make it as elaborate as possible. :D
Answer:
Longer wavelengths self means by it's name that the distance between the trough and crust are lesser than that of shorter wavelengths!
The word Lower frequency implies lower energy, thus light cannot easily penetrate the EM wave to excite electrons.
Examples of EM waves with longer wavelength :
Radiowaves, microwaves, etc..