The solar energy from sun is radiating to the earth's surface and making the atmosphere warmer. The heat energy is redistributing back by through different heat transfer modes.
What is heat transfer?Heat energy transfer from hotter region to colder region by the temperature gradient. The heat is transferring through solids by conduction. Conduction is the process of heat transfer through the closely packed particles in solids.
Heat transfers through convection in liquids. Where the hot molecules rise to the surface and transfers the heat to other molecules. The heat radiated to the earth make the sources in earth warmer. Through convection, the water molecules heat up.
The water vapor formed by convection process radiates to the atmosphere and redistributes the energy back.
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When optically active (S)-2-methylcyclopentanone is treated with aqueous base, the compound loses its optical activity. Explain this observation and draw a mechanism that shows how racemization occurs. For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly in your products. Do not use abbreviations such as Me or Ph. Collapse question part 21.55a Get help answering Molecular Drawing questions Get help answering Molecular Drawing questions. Draw (S)-2-methylcyclopentanone.
Answer:
See explanation and image attached
Explanation:
The first step in the reaction is the attack of the hydroxide ion from the base abstracting a proton from (S)-2-methylcyclopentanone.
The abstraction of a proton from water by the substrate yields the enol form in equilibrium with the keto form.
The product formed is racemic hence the optical activity of (S)-2-methylcyclopentanone is lost.
At a certain temperature this reaction follows second-order kinetics with a rate constant of 14.1·M−1s−1 : →2SO3g+2SO2gO2g Suppose a vessel contains SO3 at a concentration of 1.44M . Calculate the concentration of SO3 in the vessel 0.240 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.
Answer:
[tex][SO_3]=0.25M[/tex]
Explanation:
Hello there!
In this case, since the integrated rate law for a second-order reaction is:
[tex][SO_3]=\frac{[SO_3]_0}{1+kt[SO_3]_0}[/tex]
Thus, we plug in the initial concentration, rate constant and elapsed time to obtain:
[tex][SO_3]=\frac{1.44M}{1+14.1M^{-1}s^{-1}*0.240s*1.44M}\\\\[/tex]
[tex][SO_3]=0.25M[/tex]
Best regards!
If anyone has done the edge acids and bases lab please help me it would be deeply appreciated
Answer:
Do you mean a biology lab
Explanation:
what's the question
Select the TRUE statements below regarding the coordination compound prepared in lab. Group of answer choices The coordination compound contained a complex ion that was covalently bonded to sulfate. The ligand must have at least one unshared pair of valence electrons in order to covalently bond with transition metal in the coordination compound. Ethanol was used during crystallization of the coordination compound because the compound is soluble in ethanol. The ammonia is covalently bonded to the transition metal. The colors of many coordination compounds are the result of light absorption by the d electrons on the transition metal.
Answer: Hello the compound is missing but I was able to get the Full question and missing compound . ( compound = copper sulfate )
answer : statement ; 2 , 3 and 5
Explanation:
The true statements regarding the coordination compound ( copper sulfate ) are :
The ligand must have at least one unshared pair of valence electrons in order to covalently bond with transition metal in the coordination compound ( statement 2 )Ethanol was used during crystallization of the coordination compound because the compound is soluble in ethanol ( statement 3 ) The colors of many coordination compounds are the result of light absorption by the d electrons on the transition metal ( statement 5 )During the coordination of compounds dative bonds exits between the transition metals and the Ligands molecules
Give the name of the products formed
between Benzene and the following Compounds
Br2,Cl2,HNO3,H2SO4,HCOCl
1-chlore-2,2-dimethylpropane
Answer:
With Br2 - Bromobenzene
With Cl2 - Chlorobenzene
With HNO3- Nitrobenzene
With H2SO4 - Benzenesulphonic acid
With HCOCl - Benzoyl chloride
With 1-chloro-2,2-dimethylpropane - 2,2dimethyl-1-phenyl propane
Explanation:
The common thread joining all these reactions is that they are all electrophillic reactions. They are so called because the attacking agents in each reagent is an electrophile. Electrophiles are species that have electron deficient centers and are known to attack molecules that are high in electron density at regions of high electron density.
The benzene molecule has rich electron density. Any substituents that donates electrons to the ring improves the likelihood that benzene will undergo electrophillic substitution reactions while electron withdrawing substituents decrease the likelihood that benzene will undergo electrophillic substitution reactions.
The names of the compounds formed when benzene undergoes electrophillic reaction with the attacking agents listed in the question are displayed in the answer section.
Why are some chemical substances, like oil and coal, considered nonrenewable?
the process that forms them stops working after a decade
the process that forms them has not worked for millions of years
the process that forms them is very fast
the process that forms them is very slow
Answer:
The process of the formation of coal and oil is a very gradual and slow process.
Explanation:
The process of the formation of coal and oil is a very gradual process that takes up to millions of years.
in the cell, newely made proteins move directly from the ribosomes into the rough _____ _____, where they are chemically modified
Answer:
endoplasmic reticulum
Explanation:
there it is
3.2 g of a gas at STP occupies a volume of 2.24 L. The gas is
Answer:
Oxygen
Explanation:
What volume will 28 grams of nitrogen gas occupy at 27 Celsius and a
pressure of 785 mm Hg?
Answer: [tex]2.49\ m^3[/tex]
Explanation:
Given
Mass of nitrogen present [tex]m=28\ g[/tex]
Temperature [tex]T=27^{\circ}C\equiv 300\ K[/tex]
Pressure [tex]P=785\ mm\ \text{of}\ Hg\ \text{or}\ 1.032\ atm[/tex]
The molar mass of Nitrogen [tex]M=28\ g/mol[/tex]
No of moles of nitrogen present
[tex]n=\dfrac{m}{M}\\\\n=\dfrac{28}{28}\\\\n=1[/tex]
Using [tex]PV=nRT[/tex]
[tex]\Rightarrow 1.032\times V=1\times 8.314\times 300\\\\\Rightarrow V=\dfrac{2494.2}{1.032}\\\\\Rightarrow V=2494.2\ L\ \text{or}\ 2.49\ m^3[/tex]
For a multistep reaction the observed order of
the reaction is generally determined by the
1. stoichiometric coefficients of the net reaction.
2. ratio of reactant and product concentrations.
3. slowest reaction of the sequence.
4. time at which the concentrations of all
species are measured.
5. activation energy.
Answer: 3 slowest reaction of the squence
Explanation:
The order of reaction is obtained from the slowest step in the reaction.
An elementary reaction refers to any reaction that takes place in one reactive encounter. On the other hand, a multistep reaction occurs in several steps and involves multiple reactive encounters.
The rate determining step in a multistep reaction is the slowest step in the reaction sequence. The order of reaction is obtained from this slowest step in the reaction.
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state the type of enthalpy in the followinv equation Koh+Hcl-kcl+h2o ∆h+=-57kj\mol
Answer:
The Enthalpy of neutralization
Explanation:
The reaction of a base (KOH) with an acid (HCl) produce water and its salt (KCl) is called Neutralization Reaction.
This neutralization releases 57kJ/mol.
As the type of enthalpy is due the type of reaction. This enthalpy is:
The Enthalpy of neutralizationhsvsusvshssveuevsjsvsjdvsudvysvwkwhsjwvsgsbkwbsywvejwvsh
Sorry, I won't understand your words.
1. A bird perching in the tree hears the chirping of another bird. A whale hears
the songlike sound made by another whale swimming pcar it. Which sound
travels faster, the bird's chirping or the whale's singing? Explain your answer.
Answer:
The sound from the whales singing is faster than that from the birds chirping.
Explanation:
The sound from the whales singing will travel faster than the sound from the birds chirping because sound travels faster through a medium than through air.
In this case the whales are in water which is a medium while the birds are in the air and thus, the sound from the water will travel faster.
What is the molarity of a solution that contains 224 grams of KOH in 2
liters of solution?
Answer:
[tex]\boxed {\boxed {\sf 2 \ M \ KOH}}[/tex]
Explanation:
Molarity is a measure of concentration in moles per liter.
1. Grams to MolesThe first step is to convert the amount of grams given to moles. The molar mass is used. This found on the Periodic Table and it's the same value as the atomic mass, but the units are grams per mole.
We have 224 grams of KOH. Look up the molar masses for the individual elements.
Potassium (K): 39.098 g/mol Oxygen (O): 15.999 g/mol Hydrogen (H): 1.008 g/molSince the compound's formula has no subscripts, 1 formula unit has 1 atom of each element. We can simply add the molar masses together to find KOH's molar mass.
KOH: 39.098 + 15.999 + 1.008=56.105 g/molUse this number as a ratio.
[tex]\frac {56.105 \ g\ KOH}{1 \ mol \ KOH}[/tex]
Multiply by the value we are converting: 224 g KOH
[tex]224 \ g \ KOH *\frac {56.105 \ g\ KOH}{1 \ mol \ KOH}[/tex]
Flip the ratio so the units of grams KOH cancel.
[tex]224 \ g \ KOH *\frac {1 \ mol \ KOH}{56.105 \ g\ KOH}[/tex]
[tex]224 *\frac {1 \ mol \ KOH}{56.105}[/tex]
[tex]\frac {224}{56.105} \ mol \ KOH[/tex]
[tex]3.992514036 \ mol \ KOH[/tex]
2. Calculate MolarityRemember molarity is moles per liter.
[tex]molarity = \frac{moles}{liters}[/tex]
We just calculated the moles and we know there are 2 liters of solution.
[tex]molarity = \frac{ 3.992514036 \ mol \ KOH}{ 2 \ L}[/tex]
[tex]molarity= 1.996257018 \ mol \ KOH/ L[/tex]
3. Round and Convert UnitsFirst, let's round. The original values have 3 and 1 significant figures. We go with the lowest number: 1. For the number we found, that is the ones place.
1.996257018The 9 in the tenths place tells us to round to 1 up to a 2
[tex]2 \ mol \ KOH/ L[/tex]
Next, convert units. 1 mole per liter is equal to 1 molar or M.
[tex]2 \ M \ KOH[/tex]
The molarity of the solution is 2 M KOH
Answer:
2M of KOH
Explanation:
224 g of KOH in 2 liters of KOH
? of KOH in 1 liters of KOH
[tex]\frac{224}{2} = 112g of KOH[/tex]
1 mole of KOH = 39 + 16+ 1 = 56g
?mole of KOH = 112g
[tex]\frac{112}{56}[/tex]moles of KOH = 2 moles/1liter of KOH
written as 2M KOH
What will change more solid NiCl2 is added
If 7.4 moles of carbon dioxide is produced in this reaction, how many moles of oxygen gas would be needed?
1 C7H16 + 11 O2 = 7 CO2 + 8 H2O
Answer:
11.6 mol O₂
Explanation:
C₇H₁₆ + 11 O₂ → 7 CO₂ + 8 H₂OIn order to solve this problem we need to convert moles of carbon dioxide (CO₂) into moles of oxygen gas (O₂). To do so we'll use a conversion factor containing the stoichiometric coefficients of the balanced reaction:
7.4 mol CO₂ * [tex]\frac{11molO_2}{7molCO_2}[/tex] = 11.6 mol O₂The bullet train was traveling at a speed of 200mi/hr for 2 hours. What
was the total distance traveled? *
O 100mi
O 01mi
O 40mi
O 400mi
Answer:
Distance is speed x time
So 200 x 2 =400mi
Balance the equation K2SO4 + SrL2 =
iiiluuiijjuulluuuuuuuuullffffff
Answer:
According to who knows who I believe the answer is k2So4 + SrI2 ---> SrSo4 +2KI
S, 2. S, 2
K, 2. K, 2
I, 2. I, 2
O, 4. O, 4
how a scientist might use a graph of the
relationship between population growth and time to identify
a trend
which objects could you stand near to feel the heat
Answer:
An heater, Oven, sun, and fireplaces
Chose which ever you want
List 2 ways that the increase in human population has had a negative impact on
the environment.
I
hellppppppp asap please NO FILES
Answer:
Q1: c. 7.2 g.
Q2: a. 0.42 M.
Explanation:
Hello there!
In this case, according to the definition of molarity as moles of solute divided by volume of solution in liters, we can proceed as follows:
Q1: Here, given the molarity and volume we can calculate the moles of the sugar as follows:
[tex]n=M*V=0.4mol/L*0.1L\\\\n=0.04 mol[/tex]
Next, since its molar mass is about 180 g/mol, the mass turns out:
[tex]0.04mol*\frac{180g}{1mol} =7.2 g[/tex]
Therefore, the answer is c. 7.2 g.
Q2: Here, recalling the definition of molarity, we can just plug in the 0.629 moles and 1.500 L to obtain:
[tex]M=\frac{0.629mol}{1.5L}\\\\M=0.42M[/tex]
Therefore, the answer is a. 0.42 M.
Best regards!
Pumba
Q Zoom
From left to right on the figure, which is the order during a
lunar eclipse?
A
the Sun, the Moon, the Earth
B
Earth, the Moon, the Sun
С
Earth, the Sun, the Moon
D
the Sun, Earth, the Moon
Using the balanced reaction below, answer the following question:
2 Al + 3 ZnCl2 → 3 Zn + 2 AlCl3
How many moles of ZnCl2 are needed to react when 1.75 moles of AlCl3 form?
Answer:
Calculate the number of grams of AlCl3 produced from 2.5 moles of Cl2. The reaction between H2 and O2 produced 31.0 g of water. How many grams of O2 reacted?
Explanation:
What factors – physical, historical, and otherwise – have contributed to the traditional identification of multiple “oceans” versus the concept of a single, global ocean?
Answer:
According to this theory, the ocean formed from the escape of water vapor and other gases from the molten rocks of the Earth to the atmosphere surrounding the cooling planet. After the Earth's surface had cooled to a temperature below the boiling point of water, rain began to fall—and continued to fall for centuries.
Explanation:
0.329 M copper (II) nitrate was reacted with 0.528 M potassium carbonate as follows: Cu (NO subscript 3 )subscript 2 italic (a q italic )space plus space straight K subscript 2 CO subscript 3 italic (a q italic )rightwards arrow CuCO subscript 3 italic (s italic )space plus space 2 thin space KNO subscript 3 italic (a q italic )Determine the percent yield if 163.9 mL of each reactant were allowed to react, and a mass of 4.883 g of solid were obtained.
Answer:
73.33% is the percent yield
Explanation:
Percent yield is defined as:
Actual yield (4.883g) / Theoretical yield * 100
Based on the reaction:
Cu(NO₃)₂(aq) + K₂CO₃(aq) → CuCO₃(s) + 2KNO₃(aq)
1 mole of copper nitrate reacts per mol of potassium carbonate.
To solve this question we must find limiting reactant. With limiting reactant we can find the theoretical moles of solid produced and its mass as follows:
Moles Cu(NO₃)₂:
0.1639L * (0.329mol / L) = 0.0539 moles
Moles K₂CO₃:
0.1639L * (0.528mol / L) = 0.0865 moles
As the reaction is 1:1, the limiting reactant is Cu(NO₃)₂.
1 mol of Cu(NO₃)₂ produces 1 mol of CuCO₃. That means theoretical moles produced are 0.0539 moles. And the mass is:
Mass CuCO₃ -Molar mass: 123.55g/mol-
0.0539 moles * (123.55g / mol) = 6.659g of CuCO₃ is the theoretical mass
And percent yield:
4.883g / 6.659g * 100
73.33% is the percent yield22. Radon has a half-life of 3.83 days. How long will it take a 225 g sample to decay to 14.06 g? (3pts.)
What’s the answer
Answer:
15.32 days
Explanation:
From the question given above, the following data were obtained:
Half-life (t½) = 3.83 days
Original amount (N₀) = 225 g
Amount remaining (N) = 14.06 g
Time (t) =.?
Next, we shall determine the number of half-lives that has elapsed. This can be obtained as follow:
Original amount (N₀) = 225 g
Amount remaining (N) = 14.06 g
Number of half-lives (n) =?
N = N₀ / 2ⁿ
14.06 = 225 / 2ⁿ
Cross multiply
14.06 × 2ⁿ = 225
Divide both side by 14.06
2ⁿ = 225 / 14.06
2ⁿ = 16
Express 16 in index form with 2 as the base
2ⁿ = 2⁴
n = 4
Thus, 4 half-lives has elapsed.
Finally, we shall determine the time. This can be obtained as follow:
Half-life (t½) = 3.83 days
Number of half-lives (n) = 4
Time (t) =.?
n = t / t½
4 = t / 3.83
Cross multiply
t = 4 × 3.83
t = 15.32 days
Therefore the time for 225 g sample of Radon to decay to 14.06 g is 15.32 days
Object X carries a net negative charge. Danny touches object X and all of the excess negative charge leaves it. Danny effectively grounds object X by touching it.
Answer: B.) Object X Is A Conductor
Explanation: Since object X was able to lose all of its charge by being grounded, this means that its charges were able to move about freely. This strongly suggests that object X is a conductor. If object X had been an insulator, the ground would have had virtually no effect on its net charge.
_N₂+_H₂→ _NH₃
Balance equation
Answer:
N2+(3)H2=(2)NH3
explanation:
Describe the effects lenses have on light and their possible technological applications.
Answer:
lenses is used to refract light inward or outward
there are two type of lenses. Concave and convex lense
Convex lense converge ray of light
Concave lense diverge ray of light
useful application =:
=> camera
=> flashlight
=> lasers
=> Binoculars and Telescope
hope it helps
Answer:
Explanation:
Lenses are made of glass or other transparent materials for light. They are optically dense so light slows down on entering it. It is called refraction which bends the light on entering and leaving the lenses.
Refraction by lenses can be used for all kinds of optical applications, e.g. camera, telescope, magnifying glasses, solar heating.