Answer:
The energy of exactly one photon of this light is 4.84*10⁻¹⁹ Joules
Explanation:
A photon is an elementary particle that, according to the principles of quantum physics, makes up light.
A photon is characterized by a wavelength, denoted by λ, or, by an energy, denoted by E.
The relationship between the amount of energy (E) transported by the photon, and its frequency (v), is determined by:
E= h*v
where, as mentioned, E is the energy v is the frequency and h is the Planck constant, whose value is 6,626 * 10⁻³⁴ Joules-sec.
In this case, the frecuency is 7.30*10¹⁴ Hz. Then:
E=6,626 * 10⁻³⁴ Joules-sec* 7.30*10¹⁴ Hz
Solving:
E= 4.84*10⁻¹⁹ Joules
The energy of exactly one photon of this light is 4.84*10⁻¹⁹ Joules
The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.
Answer:
D
Explanation:
total mass should be equal on both sides
it's a double do displacement reaction
HCl + NaOH --> NaCl + H2O
Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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A strong acid _____. has a large K a has a large concentration of hydroxide ions has a small K a has a high pH number
Answer:
H2SO4
Explanation:
Answer:
A strong acid has a large Ka
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
Find the ΔG° for the combustion of half a mole of glucose C6H12O6 in kJ
Answer:
-1435 kJ
Explanation:
The Gibbs free energy, ΔG is an indication the amount of (useful) work that can be obtained from a chemical reaction involving reacting species and it is negative for spontaneous reaction
ΔG° = ΔH° - TΔS
ΔG = ΔG° + RT㏑Q
ΔG = G (reactants) - G(products)
Given that the combustion reaction of glucose is as follows;
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O
The above reaction has a ΔG° value of -2870 kJ
Therefore, the free energy for half mole of glucose = -2870 kJ/2 = -1435 kJ
what’s that mass of 7.14 X 102 mol of PC13
Answer:
16.25 x 10^-20g
Explanation:
molar mass of PCl3
31(1)+3(35.5) = 137.5
n= mass/molar mass
7.14 x 10² = mass / 137.5
mass = 7.14 x 10² x 137.5
mass = 98175g
Glve the number of significant figures in this number: 40
Answer:
1
only 4 is the significant figure
we take tailing zeroes as significant figures only in case of decimals
Answer:
the number of significant figures in this number is two because non-zero digits are always significant and a final zero or trailing zero is always counted
Explanation:
i hope this will help you :)
hi:) how to do question 3?:)
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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The possible products of a double displacement reaction in aqueous solution are SrS4, and NaCl. Which of these possible products will form as a solid in this reaction?
A. SrSO4
B. NaCl
C. Neither compound will form as a solid
D. Both compounds will form as a solid
Answer:
A. SrSO4
Explanation:
it is insoluble in water therefore it is the precipitate formed in the reaction
PLEASE HELP ASAP Florida is bordered by water on three sides. Which property of water helps moderate Florida’s coastal areas?
• low specific heat, which results in fast, large changes in water temperature
• high specific heat, which results in fast, large changes in water temperature
• low specific heat, which results in slow, small changes in water temperature
• high specific heat, which results in slow, small changes in water temperature
Answer:
i think its d
Explanation:
Answer:
High specific heat, which results in slow, small changes in water temperature
Explanation:
Just did it on Edge
The porticos inside a ballon are experiencing increase in average
Answer:
The porticos inside a ballon are experiencing increase in average
How can we tell the difference between gases like hydrogen, oxygen, and carbon dioxide cause they all look to same?
Answer:
The critical chemical difference is that CO2 contains one atom of carbon and two atoms of oxygen, whilst CO has one carbon and one oxygen atom.
How many grams of carbon dioxide does a hummingbird emit daily?
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
For each item, choose whether the change is a physical change or a chemical change.
exploding firecracker:
mowing grass:
breaking a window:
spreading butter on toast:
burning wood in a fireplace:
acid rain corroding gravestones:
Answer:
Explanation:
Exploding Firecracker - Chemical Change
Mowing Grass - Physical Change
Breaking a Window - Physical Change
Spreading butter on toast - Physical Change
burning wood in a fireplace - Chemical Change
acid rain corroding gravestones: Chemical Change
In a physical change, the chemical composition is not altered, easily reversible and no new substance is formed.
In a chemical change, the chemical composition of the substance is altered. Not reversible and a new substance is always formed at the end of the reaction.
To draw a Lewis structure for a polyatomic ion, begin by calculating A, the available electrons, and N, the needed electrons. What is N for CIO3-, the chlorate ion?
Answer:
N for chlorate ion is one
Explanation:
Because N is the number of electrons needed to form octet structure causing a negative charge of one, since it already has 25valence electrons
Answer: 26
Correct Answer
Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
A bomb calorimeter has a heat capacity of 3.82 kJ/°C. A sample of cinnamaldehyde is ignited in the calorimeter, resulting in a temperature increase from 24.53°C to 31.23°C. How much heat was created by the combustion of cinnamaldehyde?
Answer:
THE HEAT CREATED BY THE COMBUSTION OF THE CINNAMALDEHYDE IS 25.594 JOULES.
Explanation:
When heat capacity of a substance is given, the heat evolved or used up in the process is the multiplication of the heat capacity and the temperature difference.
Heat = Heat capacity * change in temperature
Heat capacity = 3.82 kJ/°C
Change in temperature = 31.23 C - 24.53 C = 6.7 °C
So therefore, the heat created by the combustion of the cinnamaldehyde is:
Heat = 3.82 * 6.7
Heat = 25.594 Joules
In conclusion, 25.594 J of heat is created from the combustion of cinnamaldehyde
Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
Bird wings and dragonfly wings are both used for flight.
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
What trend does electronegativity follow,going down the periodic table?
Answer:
The answer is option C.
Hope this helps you
In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
30.5 g of sodium metal reacts with a solution of excess lithium bromide. How many grams
of lithium metal are produced?
Answer:
9.28 g of Lithium metal
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
Na + LiBr —> NaBr + Li
Next, we shall determine the mass of sodium metal, Na that reacted and the mass of lithium metal, Li produced from the balanced equation.
Molar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 1 x 23 = 23 g
Molar mass of Li = 7 g/mol
Mass of Li from the balanced equation = 1 x 7 = 7 g
Summary:
From the balanced equation above,
23 g of Na reacted to produce 7 g of Li.
Now, we can obtain the mass of lithium metal, Li produced by reacting 30.5 g of sodium metal, Na as shown:
From the balanced equation above,
23 g of Na reacted to produce 7 g of Li.
Therefore, 30.5 g of Na will react to produce = (30.5 x 7)/23 = 9.28 g of Li.
Therefore, 9.28 g of Lithium metal, Li were produced from the reaction.
how many bonds are present in NCl3
Bi-S bond is relatively more stronger than Bi-N bond. How can you explain this with HSAB concept?
Answer:
A qualitative correlation between the extent of interaction between various Lewis acids and bases has been achieved by classifying the acids or bases into two classes: hard and soft in his theory of Hard and Soft Acids and Bases – HSAB. Acid-base reactions are then treated by the general principle that hard acids prefer to combine with hard bases and soft acids prefer to combine with soft bases (and vice versa). The criterion of hardness (or softness) is ascribed to the “hardness” of the electron cloud associated with any species. A firmly held electron-cloud with low polarizability makes a species “hard”, while an easily polarizable electron cloud characterizes the species as “soft”. A third category with intermediate character appears in the borderline.
Based on this information, tell us your best guess.
The Bi-S bond has been relatively stronger than the Bi-N bonds, as Bi has been a hard acid, and it combines more strongly with a hard base that is S.
The HSAB concept has been the hard and soft acid and base concept. The concept has also been termed the Pearson acid and base concept.
According to the concept, hard acids preferred to combine with the hard bases, and soft acids prefer to be combined with the soft bases. The concept gives the idea of the stability of the compounds.
The hard acids are the low electronegative, small ionic radius elements, while soft acids are large ionic radius, high positive charge.
The hard bases are the elements with a small radius and high electronegativity, while soft bases are the elements with a large ionic radius and high polarizability.
The given elements have been:
The Bi has been a hard acid.N has been a borderline base.S has been a hard base.Since hard acid tends to bond with a hard base, Bi tends to bond more strongly with S than N. Thus, the Bi-S bond has been stronger than the Bi-N bond.
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at 60C how much potassium nitrate can be dissolved in 400g of water
Answer:
About 110 g
Explanation:
The solubility graph is a very useful tool because it tells you the amount of potassium nitrate that can be dissolved per
100 mL
of water in order to have a saturated solution of potassium nitrate at a given temperature.
In order to find the solubility of the salt at 60 degree celcius
start from the 60 degree celcius
Mark on the graph and move up until you intersect the curve. At the point of intersection, move left until you intersect the y axis and read off the value that you land on.
In this case, you can estimate that the solubility of potassium nitrate in water at 60 degree celcius is equal to about
solubility ≈ 110 g / 100 mL water
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
This tells you that a saturated solution of potassium nitrate will hold about
110 g of dissolved salt, i.e. of dissociated salt, per 100 ml of water at 60 degree celcius
Which statement describes an effect of large asteroid and comet impacts?
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides