Answer:
4.086 × 10⁻¹⁹ J
Explanation:
Step 1: Given and required data
Wavelength of the teal line of the hydrogen emission spectrum (λ): 486.0 nmSpeed of light (c): 2.997 × 10⁸ m/sPlanck's constant (h): 6.626 × 10⁻³⁴ J.sStep 2: Convert "λ" to meters
We will use the conversion factor 1 m = 10⁹ nm.
486.0 nm × 1 m/10⁹ nm = 4.860 × 10⁻⁷ m
Step 3: Calculate the energy of one photon of this light
We will use the Planck-Einstein's relation.
E = h × c / λ
E = 6.626 × 10⁻³⁴ J.s × 2.997 × 10⁸ m/s / 4.860 × 10⁻⁷ m
E = 4.086 × 10⁻¹⁹ J
Which plate, oceanic or continental, must be more dense? How do you know
this?
Answer:
Oceanic crust is not only thinner and denser than continental crust, and it is also much younger than it and has a different chemical composition. When magma from the mantle of the earth finds a way up, it comes into contact with water that cools it down quickly
What type of bond form ionic bonds
Jorge has an unknown mineral. The mineral has a mass of 21 grams and has a volume of 3cm3. Calculate density and find his unknown material
Answer:
7g/cm³
Explanation:
Given parameters:
Mass of the mineral = 21g
Volume = 3cm³
Unknown:
Density of the mineral = ?
Solution:
Density of a substance is the mass per unit volume of the substance.
Density = [tex]\frac{mass}{volume}[/tex]
Now insert the given parameters and solve;
Density = [tex]\frac{21}{3}[/tex] = 7g/cm³
The mineral with a density of 7g/cm³ is Galena, an ore of lead.
Which two cell components have the same function but for different chemical components?
Question 7 options:
lysosome and peroxisome
vesicles and mitochondria
the Golgi apparatus and the nucleus
ribosomes and mesosomes
The two cell components that have the same function but for different chemical components are lysosome and peroxisome (option A).
What are lysosomes and peroxisomes?Lysosomes are organelles found in all types of animal cells which contains a large range of digestive enzymes capable of splitting most biological macromolecules.
On the other hand, peroxisomes are intracellular organelle found in all eukaryotes which is the source of the enzymes that catalyze the production and breakdown hydrogen peroxide, and are responsible for the oxidation of long-chain fatty acids.
Lysosomes and peroxisomes are two membrane-bound organelles that perform digestive function, however, they differ in the molecules they break down.
Therefore, the two cell components that have the same function but for different chemical components are lysosome and peroxisome.
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please answer this i need this:(
Answer:
need what?? I would love to help though!
Answer:
Explanation:
IN order for us to help you, we would like to know the question.
Balance the following DECOMPOSITION chemical reaction:
___Al2O3 (s)--> ___ Al (s) + ____ O2 (g)
a
3, 2, 4
b
4, 3, 2
c
4, 2, 3
d
2, 4, 3
Answer:
d 2,4,3
Explanation:
2 Al2O3 ----> 4 Al + 3 O2
To solve such this we must know the concept of redox reaction. Therefore, the correct option is option D. the balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Decomposition reaction is a reaction which one reactant breaks down into two or more products in presence of energy in the form of heat or electricity. The balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
Therefore, the correct option is option D. the balanced decomposition chemical reaction can be given as
2 Al[tex]_2[/tex]O[tex]_3[/tex] [tex]\rightarrow[/tex] 4 Al + 3 O[tex]_2[/tex]
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A certain rifle bullet has a mass of 6.45 g. Calculate the de Broglie wavelength of the bullet traveling at 1265 miles per hour. Consult the table of physical constants as needed.
The de Broglie wavelength of the bullet travelling at 1265 miles per having a mass of 6.45 g is 6.13 x 10⁻³³ m
De Broglie wavelength is the relation between the momentum and mass of an object. It is inversely proportional to its force. The de Broglie wavelength of an object is given by
λ = h
p
where,
λ = De Broglie wavelength
h = Planck's constant
p = momentum = mass x velocity
First, we will convert velocity fro miles per hour to m s⁻¹
Velocity = 1265 miles per hour
1 mile = 1.60 km
1265 x 1.60 = 2024
It is multiplied by 1 to convert into m s⁻¹
60 x 60
It gives = 16.86 m s⁻¹
Mass is converted from gram to kilogram
m = 6.45 g = 0.00645 kg or 6.45 x 10⁻³ kg
The momentum of bullet is p, which is
p = mv
p = 0.00645 kg x 16.86 m s ⁻¹
p = 0.108 kgms⁻¹
λ = h
p
where,
h is planck's constant = 6.63 x 10⁻³⁴ m²kg⁻¹
p is the momentum = 0.108 kgms⁻¹
λ is the de Broglie wavelength
putting the values,
λ = 6.63 x 10⁻³⁴ m²kg⁻¹
0.108 kgms⁻¹
λ = 6.13 x 10⁻³³ m
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pls someone help me when i get this done i am done with my work i will give brainlist to
Heat is often a by-product of an energy transfer, even when it is not intentional. Name one example where heat is an intentional product and one example where heat is not an intentional product of an energy transfer. Use details to support your answer.
Answer:
well i think coffe is an example cause it goes from hot to cold
Treatment of (2R,3R)-2,2-epoxy-3-methylpentane with aqueous acid results in a ring-opening reaction. Draw structural formulas for the first and second intermediates in this reaction.
Answer:
Explanation:
In an acid-catalyzed epoxide ring-opening reaction, there is a formation of two intermediate in the reaction. The first stage involves the protonation of oxygen in the epoxide. The stage is followed by the attraction of water molecules onto the more substituted carbon atom in the epoxide ring. The stepwise reaction mechanism can be seen in the image attached below.
Which is responsible for producing heat and light from the sun?
wind energy
electrical energy
nuclear energy
chemical energy
Answer:
nuclear energy
Explanation:
heat and light is due to release of energy due to nuclear fusion in the sun
Answer:
Chemical energy
Explanation:
Determine the frequency of light with a wavelength of 675nm
Answer:
4.44 x 10^14 Hz
Explanation:
The frequency of light is 0.00148 Hz. This can be determined y using the value of wavelength.
What is Frequency?It is defined as the reciprocal of the wavelength.
Frequency = 1 / wavelength
Given:
Wavelength = 675 nm
To find:
Frequency=?
On subsituting the values:
f= 1/ 675 nm
f=0.00148 Hz
Thus, the frequency of light is 0.00148 Hz.
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How do I cook eggs? Please tell me
How many grams of nitrogen monoxide are present if 33.7 L of ammonia and 41.3 L of Oxygen are reacted at 296.3 K and 1.26 atm? What is the enthalpy change for the reaction? NH3(g) + O2(g) -> NO(g) + H2O(l)
Answer:
29.7g of NO are present
Explanation:
With volume, absolute temperature and pressure we can determine moles of ammonia and oxygen that reacts. With these moles we can determine limiting reactant and moles (And mass) of nitrogen monoxide produced as follows:
Moles Ammonia:
PV = nRT
PV/RT = n
1.26atm*33.7L / 0.082atmL/molK*296.3K = 1.748 moles ammonia
Moles Oxygem:
PV = nRT
PV/RT = n
1.26atm*41.3L / 0.082atmL/molK*296.3K = 2.142 moles oxygen
Based on the chemical reaction, 1 mole of NH3 reacts per mole of O2 producing 1 mole of NO.
Thus, limiting reactant is ammonia and moles of NO produced are = Moles of ammonia added = 1.748mol NH3
Mass Ammonia:
1.748mol NH3 * (17g/mol) =
29.7g of NO are presentA single atom with a unique number of protons
Answer:
One atom of that element like helium neon and other Noble gases
Explanation:
Answer:
Please make sure to re-write this on your own so your teacher doesn't think you cheating!Explanation:
The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. An example is all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.
15.How can a pure sample of barium sulphate be otained from barium carbonate?
Answer:
Barium carbonate powder is stirred add pulp in the entry, the vitriol that the adds solubility then reaction that makes the transition is filtered and is obtained the barium sulfate filter cake and liquid after the transition.
What mass of hydrogen atoms are in 187 g of zinc hydroxide: Zn(OH)2 (Mw. 99.43)?
The mass of H atoms in 187g of zinc hydroxide Zn(OH)₂ is 3.76 gm
Given,
The molar mass of zinc hydroxide = 99.43 g/mol
We have to find the mass of the hydrogen atoms in 187 gm of zinc hydroxide.
Mass of H in 99.43 g of Zn(OH)₂ = 2 gm
Mass of H in 1 g of Zn(OH)₂ = 2 / 99.43
Mass of H in 187 g of Zn(OH)₂ = 0.02 × 187 gm
Or, the mass of H in 187 g of Zn(OH)₂ is 3.76 gm
The molecular mass of any substance tells us the sum of atoms present in the compound. The number of moles can be calculated by the given mass to the molecular mass.
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11,12,13,14 please...
PLEASE HELP
This picture represents a model of:
Question 5 options:
Oxygen
Calcium
Boron
Neon
Answer:
The picture represents oxygen.
Explanation:
There are two notable ways you can figure this out:
1) Since there are eight protons, you can automatically know that you are looking for an element with an atomic number of 8. This is because the atomic number is the number of protons in an atom.
2) You can also note the number of electrons on the outer shell. These are called valence electrons. You can then see that the element has 6 valence electrons. Beginning with Lithium on the periodic table and count by ones going from left to right in period 2 of the periodic table until you get to 6. What element is that? It is indeed oxygen.
Answer:
Oxygen
Explanation:
Neons contain 8 protons and 10 ELECTRONS
Boron contains 5 protons an 5 electrons
calcium contains 20 electrons an 0 protons
Determine the mass in grams of 6.63 × 10²¹ atoms of chromium. (The mass of one mole of chromium is 52.00 g.)
Answer:
About 0.573g Cr
Explanation:
Which of the following is considered a contact force?
Group of answer choices
friction between an object and chair
the force between two magnets
the force between two charged particles
the gravitational pull of a planet
Answer:
☑ Friction between an object and chair
☐ The force between two magnets
☐ The force between two charged particles
☐ The gravitational pull of a planet
Calculate 1.4 + 15 + 7.15 +8.003 using the proper number of significant figures. 32 31.55 O 31.550 31.553 31.6
The result of the calculation to the proper number of significant figures will be 31.6.
Addition operation to a proper significant figureThere are certain rules guiding significant figures in mathematical operations.
When it comes to performing an addition or subtraction operation, the significant figure of the final answer takes cognizance of the participating number in the operation with the lowest significant figure after the decimal. The number of significant digits is then applied to the final answer, after its decimal.In division of multiplication operations, the figure with the lowest significant digits determines the significant digits of the final answer.Following the first rule:
1.4 + 15 + 7.15 + 8.003 = 31.553
The participating number with the lowest significant digit after the decimal is 1.4 with just one significant digit. Thus, the final answer would be 31.6.
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The smallest part of a molecule is called
A) a compound
B) a solute
C) an insulator
D) an atom
Answer:
D atom
Explanation:
The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms
Answer:
an insulator is right answer
Explanation:
i hope it is helpful for you
Identify the intermediate leads to the major product for the reaction of 2-methyl-2-butene with hydrogen bromide in the presence of peroxide.
Answer:
II
Explanation:
We must have a good idea of the fact that there are two mechanisms that come into play when we are discussing about the addition of hydrogen halides to alkenes. The first is the ionic mechanism and the second is the radical mechanism.
The ionic mechanism is accounted for by the Markovnikov rule while the radical mechanism occurs in the presence of peroxides and is generally referred to as anti Markovnikov addition.
The intermediate in anti Markovnikov addition involves the most stable radical, in this case, it is a tertiary radical as shown in the images attached. The most stable radical is II hence it leads to the major product shown in the other image.
A student is doing an experiment that stoichiometry says should produce 34.6 grams of product. The student actually makes 25.2 grams. What is the students percent yield?
Percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. The percent yield of the reaction with the theoretical yield 34.6 g and actual yield of 25.2 g is 72.8%.
What is percent yield ?Percent yield is used compare the actual yield and theoretical yield of a reaction. It is the ratio of actual yield to the theoretical yield multiplied by 100.
Theoretical yield of a reaction is determined from the balanced chemical equation of the reaction. The actual yield or experimental value must vary from the stoichiometric expectation.
Given the theoretical yield = 34.6 g
actual yield = 25.2 g
percent yield = actual yield/ theoretical yield × 100
= 25.2 g/ 34.6 g × 100 = 72.8 %
Therefore, the percent yield of the reaction is 72.8 %.
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What is the answer? Please
Answer:
Carbon Dioxide
Explanation:
Because plants take in Carbon Dioxide, then let out Oxygen
a solution of AICI is combined with a solution of KOH. Identify the precipitate and the spectator ions in the resulting reactions.
The the precipitate : Al(OH)₃(s)
The spectator ions : 3Cl⁻ and 3K⁺
Further explanationReaction
AlCl₃ + 3KOH → Al(OH)₃ + 3KCl
From solubility rules :
Compounds of OH− are insoluble except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺ , Sr²⁺, and Ba²⁺
Compounds of Cl−, Br−, I− are soluble except Ag⁺, Hg₂²⁺, Pb²⁺
So the the precipitate : Al(OH)₃(s)
net ionic reaction
AlCl₃ + 3KOH → Al(OH)₃ + 3KCl
Al³⁻+3Cl⁻+3K⁺+3OH⁻⇒Al(OH)₃(s)+3K⁺+3Cl⁻
Remove the spectator : 3Cl⁻ and 3K⁺
Al³⁻(aq)+3OH⁻(aq)⇒Al(OH)₃(s)
Which of the following is an example of pseudoscience?
Biology
Chemistry
Physics
Superstition
Answer:
superstition
Explanation:
Sodium carbonate reacts with silver nitrate according to the following balanced equation: Na2CO3 (s) + 2 AgNO3 (aq) → Ag2CO3 (s) + 2 NaNO3 (9) If 3.60 g of Na2CO3 is allowed to react with 5.14 g of AgNO3, what mass of Na2CO3 will remain at the end of the reaction?
a) 2.01 g
b) 1.54 g
c) 0.423 g
d) 0.0150 g
e) 0g
Answer:
a) 2.01 g
Explanation:
Na₂CO₃ (s) + 2AgNO₃ (aq) → Ag₂CO₃ (s) + 2NaNO₃First we convert 0.0302 mol AgNO₃ to Na₂CO₃ moles, in order to calculate how many Na₂CO₃ moles reacted:
0.0302 mol AgNO₃ * [tex]\frac{1molNa_2CO_3}{2molAgNO_3}[/tex] = 0.0151 mol Na₂CO₃So the remaining Na₂CO₃ moles are:
0.0340 - 0.0151 = 0.0189 moles Na₂CO₃Finally we convert Na₂CO₃ moles into grams, using its molar mass:
0.0189 moles Na₂CO₃ * 106 g/mol = 2.003 g Na₂CO₃The closest answer is option a).
If the equilibrium constant of a given reaction is 8.24, what is the equilibrium constant of its reverse reaction
Answer:
0.121
Explanation:
for reverse reaction use the receprocal of 8.24
what would be the reaction mechanism?
Answer:
ch2coo3 is the reaction of mechanism