Answer:
The correct answer is - option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.
These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4
An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).
Generally, the electromagnetic spectrum comprises the following:
Gamma rays.Visible light.Ultraviolet radiation.X-rays.Radio waves.Infrared radiation.When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.
Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.
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What is the mass of a single atom, which is approximately equal to the total mass of the protons and neutrons in an atom called?
Answer:
Mass number or relative atomic mass number.
Which field is not a branch of biology
Botany
Geology
Zoology
Genetics
Answer:
Geology
Explanation:
Geology is not a branch of biology.
Biology is the study of all forms of lives. Bio - life and logy - study
It consists of studies of plants, animals and micro-organisms. Some of its sub-branches are zoology, botany, genetics, micro-biology e.t.c.
Geology is the study of the earth. It deals with the materials that makes up the earth and how they have evolved through time. some of its sub-disciplines are hydro-geology, stratigraphy, geochemistry e.t.cAnswer:
geology
Explanation: I took the test.
Can you determine the equation for density?
Answer:
YESBSJSKSSKEKEJRJRJER
A copper wire is composed of billions of copper units. In this case, the copper in the wire is a(n) __________.
A. atom
B. molecule
C. compound
D. mixture
E. element
Something used to represent a complex idea or process in science is a what
Answer:
a model?
Explanation:
im not sure! i think so
Answer:
Yes, It is a model
Explanation:
A complex idea or a process can be demonstarated by using a Model because you can see things easier and its basically a copy of anything from forests to volcanoes but smaller to make it easier to see.
Hope This Helps
9.81g of manganese(iv) oxide react with 6.54 g of aluminum to make 5.65g of aluminum oxide and an unknown mass of manganese determine the limiting reagent theorectical yield and percent yielf
Answer:
MnO₂ is limiting reactant
7.68g is theoretical yield
73.6% is percent yield
Explanation:
The reaction of the question is:
3MnO₂ + 4Al → 2Al₂O₃ + 3Mn
To determine limiting reactant we need to convert each reactant to moles and, based on the chemical equation determine the moles you need of the other reactant for a complete reaction:
Moles MnO₂ -Molar mass: 86.937g/mol-:
9.81g * (1mol / 86.937g) = 0.113 moles
Moles Al -Molar mass: 26.98g/mol-:
6.54g * (1mol / 26.98g) = 0.242 moles
For a complete reaction of 0.242 moles of Aluminium you will require:
0.242mol Al * (3MnO₂ / 4Al) = 0.182 moles of MnO₂
As there are just 0.113moles of MnO₂, MnO₂ is limiting reactant
Now, with limiting reactant we need to determine theoretical moles and grams of Al₂O₃ produced:
Moles:
0.113 moles MnO₂ * (2Al₂O₃ / 3MnO₂) = 0.0753 moles Al₂O₃
Grams (Molar mass: 101.96g/mol):
0.0753 moles Al₂O₃ * (101.96g/mol) = 7.68g is theoretical yield
Percent yield is 100 times the ratio between actual yield (5.65g) and theoretical yield:
5.65g/7.68g * 100 =
73.6%Which carries information by copying an original sound?
Answer:
frequency
Explanation:
i just did it
Answer:
A: analog signal
Explanation:
on edge2021!
what do you mean by the region or space that an electron revolves the nucleus in an atom?
An atomic orbital is a mathematical feature describing the region and wave-like behavior of an electron in an atom. This characteristic can be used to calculate the opportunity of finding any electron of an atom in any precise location across the atom's nucleus.
What's the vicinity of space in which there's a high opportunity of locating an electron?An atomic orbital is regularly idea of as a location of space wherein there is an excessive opportunity of finding an electron. Every energy level corresponds to an orbital of a one-of-a-kind form, which describes wherein the electron is probable to be observed.
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Which of the following could result from a substance that undergoes a physical change
Answer:
B. It undergoes phase change.
Explanation:
what is the formula for calcium bisulfate
Answer:
the formula
Explanation:
Calculate the number of hydrogen atoms in 41.4 g of
ethyl alcohol, C2H60.
Answer:
3.25 x 10²⁴ atoms of H
Explanation:
First you have to convert from grams to moles of C₂H₆O using the molar mass of C₂H₆O, which is 46.06 g/mol. Then convert from moles of C₂H₆O to moles of H using the ratio within the compound; for every molecule of C₂H₆O, there are 6 H atoms. Then lastly, because moles just represent a number in the same way a dozen does, we convert from moles of H to the number of atoms of H. 1 mole H = 6.022 x 10²³ atoms of H.
[tex]41.4g*\frac{1molC2H6O}{46.06C2H6O} * \frac{6 mol H}{1molC2H6O} * \frac{6.022 * 10^2^3atomsH}{1molH} = 3.2476 x 10^2^4atomsH[/tex]
Round to lowest number of significant figure which is three to get 3.25 x 10²⁴.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The the total number of atoms of hydrogen atoms in 41.4 g of ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
Number of atoms =number of moles×6.022×10²³ (Avogadro number)
number of moles= given mass÷ Molar mass
Given mass=41.4 g
Molar mass of C₂H₆0=46.07 g/mol
number of moles= 41.4 g ÷ 46.07 g/mol=0.89mol
Number of atoms =0.89mol×6.022×10²³ (Avogadro number)
=5.35×10²³ atoms
Therefore, the total number of atoms of hydrogen atoms in 41.4 g of
ethyl alcohol, C₂H₆0 is 5.35×10²³ atoms.
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If you include structures in which sulfur has an expanded octet and exclude structures with triple bonds, how many resonance structures can be drawn for sulfur trioxide, SO3
Answer:
Seven
Explanation:
SO3 has a trigonal planar structure. The most apt bonding description is that of sulphur forming three sigma bonds giving rise to the plane triangle and then the presence of three delocalized pi bonds.
Plausible resonance structures for SO3 has been shown in the image attached. In all the structures, there is none in which sulphur is pictured as having triple bonds.
image credit: socratic
What element has the following electron configuration:
1s22s22p63s23p2
What body of water is south of Constantinople? Atlantic Ocean Indus River Black Sea Mediterranean Sea
How many grams of mgcl2 must be provided 1.89 mole of chloride ions
Answer:
Mass = 89.97 g
Explanation:
Given data:
Number of moles of chloride ions = 1.98 mol
Mass in grams of MgCl₂ present = ?
Solution:
we can see that 1 mole of MgCl₂ contain 2 moles of chloride ions. Thus 1.89 moles of chloride ions contain moles of MgCl₂ are,
Cl₂ : MgCl₂
2 : 1
1.89 : 1/2×1.89 = 0.945
Thus, 1.89 moles of chloride ions are provided by 0.945 moles of MgCl₂.
Mass of MgCl₂:
Mass = number of moles × molar mass
Mass = 0.945 mol × 95.211 g/mol
Mass = 89.97 g
For the equation 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂ suppose you had 27.4 grams of H₃PO₄?
a. How many grams of Ca would you need to react with this number of moles of H₃PO₄?
b. How many grams of hydrogen gas will be produced?
c. How many moles of calcium phosphate will be produced?
Please answer all questions clearly, with work shown! Thank you!!
Answer:
Explanation:
Given 2H₃PO₄ + 3Ca ⇒ 3H₂ + Ca₃(PO₄)₂
27.4g
=(27.4g/98g/mol)
= 0.280 mole H₃PO₄ used
Ca Used:
Rxn Ratio H₃PO₄ : Ca => 2:3
∴ moles Ca used = 3/2(0.280) mole Ca =0.420 mole Ca
grams Ca used = 0.420 mole Ca x 40 g/mole = 16.8 grams Ca used
Grams H₂ Produced:
Rxn Ratio H₃PO₄ : H₂ => 2:3 => moles H₂ produced = 3/2(0.28 mole H₂) = 0.420 mole H₂ = (0.420 mole H₂ x 2.02 g/mole) = 0.8484 grams H₂(g) Produced.
Moles Ca₃(PO₄)₂ Produced:
FWt Ca₃(PO₄)₂ = 310 g/mole
Rxn Ratio H₃PO₄ : Ca₃(PO₄)₂ => 2:1
∴moles Ca₃(PO₄)₂ Produced = 1/2(moles H₃PO₄ used)
= 1/2(0.28 mole) = 0.14 mole Ca₃(PO₄)₂
If you want grams Ca₃(PO₄)₂, multiply moles Ca₃(PO₄)₂ by formula weight.
J.J. Thomson discovered the electron in 1897. In 1904, he proposed a model of an atom, describing that there was an equal distribution of negative and positive charges throughout the atom. In 1909, Ernest Rutherford tested J.J. Thomson’s model by shooting positive particles at gold foil. Based on Thomson's model, it was predicted that the particles would fly through the foil with a small amount deflected back. Analyzing the results, Rutherford discovered that more of the particles bounced back than expected. Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
A. Rutherford’s results were invalidated and discarded because Thomson’s model was correct.
B. Rutherford’s results supported parts of Thomson's model, but also provided new data and interpretations.
C. Rutherford’s results suggested that the model proposed by Thomson was based on false research and required a change in his hypothesis.
D. Rutherford’s results supported Thomson’s model that there was a negative core surrounded by positive charges and caused a modification in the overall atomic theory.
Rutherford's results declined the results of Thomson's model, the correct option is C.
What are Atomic models?Atomic Models are the scientific theories proposed to determine the structure of an atom.
There are mainly 5 theories proposed for atomic models.
1. John Dalton's Atomic Model: An atom is the basic building block of all physical entities in the universe.
2. Plum Pudding Model, created by J.J. Thomson, uses the comparison of plum pudding, where the positive charge is uniformly dispersed throughout and the negative charge is randomly sprinkled on top, to explain how subatomic particles are structured.
3. Rutherford's model: proved the presence of a nucleus.
4.Niel Bohr's model: Arrangement of electrons in shells.
5. Erwin Schrodinger's model is also called as Quantum Model.
In J.J. Thomson's model, the equal distribution of positive and negative charges is proposed while,
Rutherford's theory declines this arrangement and proposes that the positively charged nucleus occupies a very small part and there is empty space in the atom.
So, Rutherford’s results suggested that the model proposed by Thomson was based on false research and required.
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The reaction between methanol and oxygen gas produces water vapor and carbon dioxide. 2CH3OH(l)+3O2(g)⟶4H2O(g)+2CO2(g) Three sealed flasks contain different amounts of methanol and oxygen. Based on the molecular view of the three flasks, which would produce the largest quantity of total product? The flask contains 3 molecules of C H 3 O H and 3 molecules of O 2. The flask contains 1 molecule of C H 3 O H and 6 molecules of O 2. The flask contains 4 molecules of C H 3 O H and 2 molecule of O 2. For the flask which produces the largest quantity of total product, how many molecules of H2O will be formed? molecules of H2O :
Answer:
The flask that produces the largest quantity of product is the second flask
The molecules of H 2 O formed is [tex]X = 8 \ molecules [/tex]
Explanation:
From the question we are told that
The reaction is
2CH3OH(l) + 3O2(g)⟶4H2O(g)+2CO2(g)
The first flask contains 3 molecules of C H 3 O H and 3 molecules of O 2
The second flask contains 1 molecule of C H 3 O H and 6 molecules of O 2
The third flask contains 4 molecules of C H 3 O H and 2 molecule of O 2.
Looking at the three flasks we can see that base on molecular view the flask which produces the largest quantity of total product is second flask
From the balanced equation we see that 2 moles of C H 3 O H are required to react with 3 moles of oxygen hence O 2 is the limiting reactant
Generally 1 mole of any substance is [tex]1 * N_A[/tex] of that substance
Here [tex]N_A[/tex] is the Avogadro number with the value [tex]N_A = 6.02214076 * 10^{23} \ molecules[/tex]
So
Looking at the balanced equation we see that 3 moles of O 2 (3 * [tex]N_A[/tex] molecules of O 2 ) produces 4 moles of H2O(4 *
Then 6 molecules of O 2 will produce X molecules of H 2 O
So
[tex]X = \frac{6 * (4 * N_A }{3 * N_A}[/tex]
=> [tex]X = 8 \ molecules [/tex]
Describe the porosity and permeability of Antarctic soil.
Answer:
Explanation: Geography · College. +5 pts ... Answer. 1.9/5. 16. Girly1004. Ambitious. 1 answer. 4 people helped ... are places that show evidence of a massive ice sheet that existed around 250 million years ago.
Students want to gather evidence for the claim that the number of atoms present before a chemical reaction is equal to the number of atoms present after the chemical reaction. They decide to react vinegar and baking soda in a sealed plastic bag. Which of the following would provide evidence the students need
Answer:
The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Explanation:
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the reaction shows the law of conservation of mass.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.
Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction.
Therefore, the reaction shows the law of conservation of mass.
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Cyclohexanecarboxylic acid, C6H11COOH (pKa 4.90), is only slightly soluble in water, but its sodium salt, C6H11COO-Na , is quite soluble in water. Describe the solubility of cyclohexanecarboxylic acid in solutions of sodium hydroxide, sodium bicarbonate (NaHCO3), and sodium carbonate (Na2CO3). The pKa values for the conjugate acids of sodium hydroxide, sodium bicarbonate (NaHCO3), and sodium carbonate (Na2CO3) are 15.7, 6.36, and 10.33, respectively.
Answer:
See explanation
Explanation:
Carboxylic acids are all soluble in solutions of NaOH, Na2CO3 and NaHCO3 due to the formation of a sodium salt of the acid.
In all these cases, the sodium salt of cyclohexanecarboxylicacid formed is more soluble in water than the parent acid.
When the acid is dissolved in sodium bicarbonate or sodium carbonate, carbon dioxide gas is also evolved.
30 g of pineapple added to a drink the drink rises 5 ml what is the density of the pineapple
Answer:
Density of pineapple is 6 g/mL.
Explanation:
Given data:
Mass of pineapple = 30 g
Volume rises = 5 mL
Density of pineapple = ?
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
The volume rises by drink is actually the volume of pineapple.
d = 30 g/ 5 mL
d = 6 g/mL
Density of pineapple is 6 g/mL.
Five characteristics of gas,solid and liquid(make brainest)
Answer:
1. Gases have neither definite shape nor definite volume. They expand to the size of their container.
2. Gases are fluid, and flow easily.
3. Gases have low density, unless compressed. ...
4. Gases diffuse (mix and spread out) and effuse (travel through small holes).
Explanation:
Pepsi
Vinegar
Orange Juice
What property do all three of these common household substances have in common?
A)
They are all acidic.
B)
They all taste bitter.
C)
They all have a pH above 7.
D)
They all turn litmus paper blue.
Answer:
A) They are all acidic.
Explanation:
All 3 of those have acidic qualities in the drink.
Answer:
They are all acidic
Explanat
step of the scientific method reviews your original question and your hypothesis.
results
observation
conclusion
experiment
Answer: conclusion
Explanation:
It say reviews your original question and your hypothesis
Answer:
conclusion!
Explanation:
Which is the correct name for P205?
O phosphorus dioxide
O phosphorus pentoxide
diphosphorus pentoxidev
diphosphorus hexaoxide
Answer:
Diphosphorus Pentaoxide
Explanation:
We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.
2 is Di
5 is penta
Diphosphorus Pentaoxide
Answer:
C. Diphosphorus Pentaoxide
Explanation:
what is it called when you apply science and mathematics to real life problems
Answer:
I think S.T.E.M but i'm not 100% sure
Explanation:
Juan measures a piece of metal and determines it has a mass of 10 grams and a volume of 2 ml
What is the density of the piece of metal?
Answer:
The answer is 5.0 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 10 g
volume = 2 mL
We have
[tex]density = \frac{10}{2} \\ [/tex]
We have the final answer as
5.0 g/mLHope this helps you
Answer:
5.0 g/mL
Explanation:
Insoluble molecular compounds break apart into atoms when added to water.
True
O False
Answer:
False.
This is false because, no chemical reaction could possibly happen.
But in case of sodium it is highly reactive with water.......... so there will be a chemical reaction.
but as sodium is not a insoluble molecular compound this is not applicable to the situation.
We should exhaust all possiblr resources from nature says a miner?
Answer: No
Explanation: Some scientists have declared that mineral deposits containing important non renewable resources such as copper and zinc will be exhausted in a few decades if consumption does not decrease.
