Answer:
it is he
Explanation:
beacuse Noble gases have 2 volence
The reaction A→B is to be carried out isothermally in a continuous-flow reactor. Calculate the PFR volume to consume 99% of A (CA = 0.01CA0) when the entering molar flow rate is 5 mol/h (assume pure A), the volumetric flow rate is constant at 10 dm3 /h and the rate is: -rA=3CA 2 [ dm3 /mol•h]
Answer:
Explanation:
From the information above:
The equation for the reactor volume of CSTR is given by the formula:
[tex]V = \dfrac{C_{Ao}V_o - C_A V_o }{-rA}[/tex]
[tex]V = \dfrac{C_{Ao}V_o (1 - 0.01)}{KC_A^2}[/tex]
The reaction rate of A is:
[tex]-r_A = kC_A^2[/tex] and k = 3 dm³/mol.h
replacing the values in the above equation to solve for v;
∴
[tex]V = \dfrac{(0.5 \ mol/dm^3) (10 \ dm^3/h) (1 - 0.01)}{ ( 3 \ dm^3/mol.h) (0.01 \times 0.5 \ mol/dm^3)^2}[/tex]
V = 66,000 dm³
Thus, the reactor volume of CSTR is 66000 dm³
Taking the differential mole balance equation for PFR is as follows:
[tex]\dfrac{d(C_AV_o)}{dV} = -r_A[/tex]
[tex]\dfrac{d(C_AV_o)}{dV} = Kc^2A[/tex]
Taking the integral between initial and final concentrations;
[tex]\dfrac{v_o}{k} \int ^{C_A}_{C_{Ao}} \dfrac{dC_A}{C^2A}= - \int ^V_o \ dV[/tex]
[tex]V = \dfrac{V_o}{K} \Big [\dfrac{1}{C_A}- \dfrac{1}{C_{Ao}} \Big ][/tex]
replace the values in the above equation;
[tex]V= \dfrac{(10 \ dm^3/h) }{(3 \ dm^3/mol.h)}\Big [ \dfrac{1}{0.01(0.5 \ mol/dm^3)} - \dfrac{1}{0.5 \ mol/dm^3} \Big ][/tex]
[tex]\mathbf{V = 66 0 \ dm^3}[/tex]
Thus, the reactor volume of PFR is 660 dm³
How many molecules are contaiined in 125 grams of water, H2O?
Answer:
Water has a molar mass of 18.015 g/mol . This means that one mole of water molecules has a mass of 18.015 g . So, to sum this up, 6.022⋅1023 molecules of water will amount to 1 mole of water, which in turn will have a mass of 18.015 g . 2.7144moles H2O ⋅6.022⋅1023molec.
Explanation:
The acid digestion test left 2.595 g of fiber from a composite specimen weighing 3.697 g. The composite specimen weighs 1.636 g in water. If the specific gravity of the fiber and matrix is 2.5 and 1.2, respectively, find the 1. Theoretical volume fraction of fiber and matrix 2. Theoretical density of composite
Answer:
0.4323 ; 1.5394
Explanation:
Given that :
Specific gravity of Fibre (Sf) = 2.5
Specific gravity of Matrix (Sm) = 1.2
Mass of Fibre, Mf = 2.595g
Weight of composite specimen in water , Wc = 1.636g
Composite weight, Ww = 3.697 g
Weight of Fibre and matrix
Volume fraction of Fibre and matrix :
[(Mf/Sf) ÷ (Mf/Sf + Wc/Sm)] * 100
[(2.595/2.5) ÷ (2.595/2.5 + 1.636/1.2)]
(1.038 ÷ 2.4013333)
= 0.43225986
= 0.4323
2.)
Theoretical density of composite :
Weight of composite / (Mf/Sf + Wc/Sm)
3.697 / (2.595/2.5 + 1.636/1.2)
3.697 / 2.4013333
= 1.5395613
= 1.5394
Accreditation of laboratories that do forensic investigations is:_________
a. always required
b. done voluntarily
c. done using independent nongovernmental agencies such as ASTM and ISO
d. done by a special government agency to insure uniformity of testing and results across all laboratories is never done since this
e. is expensive and does not improve the results obtained by the laboratory
Answer:
a. always required
Explanation:
Accreditation of laboratories is a mandatory requirement for forensic science providers. To manage the quality of services provided by the forensic laboratories, Accreditation, Certification, and Interagency Working Group have found it necessary to make the accreditation of forensic laboratories mandatory.
This will instill confidence in the public and ensure that the services rendered by them are always accurate and up to standard.
How many elements are present in the compound RbMnO4?
Physical or Chemical change?
Answer: Chemical Change
Explanation:
because it probably doesnt change the physical anatomy of the object only the atoms/ molecule relations
Which bond would require more energy to break apart? (Short bond or Long bond). Explain
a) longer bond. because the charges are further apart
b) shorter bond. because the charges are closer together
c) shorter bond. because the charges are both positive
d) longer bond. because the charges are closer together
Answer:
shorter bond, because charges are close apart
Explanation:
shorter the bond length more is the energy required to break the bond for example if you take three pencils of different sizes one longer One medium sized One Shot sized if you try to break them the longer pencil will break much faster than the other two because the greater the length the lesser the strength the lesser energy you need to apply to break them apart ...
hope you understand
A chemist carefully measures the amount of heat needed to raise the temperature of a 894.0g sample of a pure substance from to −5.8°C to 17.5°C. The experiment shows that 4.90kJ of heat are needed. What can the chemist report for the specific heat capacity of the substance?
Answer:
C = 0.2349 J/ (g °C)
Explanation:
Mass, m = 894.0g
Initial Temperature = −5.8°C
Final Temperature = 17.5°C
Temperature change = 17.5°C - (−5.8°C) = 23.3
Heat, H = 4.90kJ = 4900 J
Specific heat capacit, C = ?
The relationship between these quantities is given by the equation;
H = mCΔT
C = H / mΔT
C = 4900 / (894)(23.3)
C = 0.2349 J/ (g °C)
what do you think will happen if there is no coal.
Answer:
If coal and petroleum will get exhausted it will be very difficult for us to transport because most vehicles depends on petroleum, Transport on Earth will became complicated, and if coal will get exhausted we will lose an unique fossil fuel. Coal is used in various domestic and industrial purposes.
explain the difference between aldehyde and ketones
Answer:
You will remember that the difference between an aldehyde and a ketone is the presence of a hydrogen atom attached to the carbon-oxygen double bond in the aldehyde. Ketones don't have that hydrogen. ... Aldehydes are easily oxidized by all sorts of different oxidizing agents: ketones are not.
how many moles are in a 25.0 grams of carbon dioxide
answer:44.0095
Explanation:
sana makatulong
Answer:
44.0095
Explanation:
We assume you are converting between grams CO2 and mole. You can view more details on each measurement unit: molecular weight of CO2 or mol This compound is also known as Carbon Dioxide. The SI base unit for amount of substance is the mole.
How many atoms are in 0.580 moles of CO2?
Answer:
[tex]1.05x10^{24}atoms[/tex]
Explanation:
Hello!
In this case, according to the definition of the Avogadro's number, it is possible to realize that one molecule of CO2 contains 3 moles of atoms, one of carbon and two of oxygen, thus, we have:
[tex]0.580molCO_2*\frac{3mol\ atoms}{1molCO_2} =1.74mol\ atoms[/tex]
Then, we use the Avogadro's number to obtain:
[tex]1.74mol\ atoms*\frac{6.022x10^{23}atoms}{1mol\ atoms} \\\\1.05x10^{24}atoms[/tex]
Best regards!
Pls answer this two ASAP PLSSSSSSSS
Answer:
1. aa
2. They have similar DNA
Explanation:
1. According to the question 1, wrinkled seeds (A) are dominant over round seeds (a) in pea plants. This means that, based on the law of dominance proposed by Mendel, wrinkled seeds will be expressed over round seeds in a heterozygous state (Aa).
However, since the round seed phenotype is a recessive trait, it will only be expressed when the alleles for round seeds (a) are the same in the gene i.e. aa genotype.
2. Based on the information in question 2, Ricky, who is working on a family tree for his school project, realizes that his close relatives all look similar in the pictures he collected. This is possible because of the SIMILARITY OF THEIR DNA (genetic material). Note that, relatives are connected by the genes that are inherited from one another, hence, they possess a similar DNA, which is the most valid reason for the resemblance.
Based on the type or types of intermolecular forces, predict the substance in each pair that has the higher boiling point Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer Reset Help stronger dispersion forcesG Given the molecules propane (C3Hs) and n-butane (C4H10), Г- has the higher boiling point mainly due to n-butane (C,H Given the molecules diethyl ether (CH3 CH2OCH2 CHs) and 1-butanol (CH3 CH2CH2 CH2OH) higher boiling point mainly due to 1-butanel CH,CH, CH,CH,OH) diethyl ether (CH CH,OCH CH, has the propane (C, H ts greater melar mass
Answer:
C4H10 has a higher boiling point due to stronger dispersion forces
1-butanol has the greater boiling point mainly due to hydrogen bonding influences
Explanation:
If we consider propane and n-butane, we discover that they are both alkanes. However, the magnitude of dispersion forces in alkanes depends on the length of the carbon chain. The greater the length of the carbon chain is greater in n-butane than in propane. The greater the chain length, the greater the magnitude of dispersion forces and the greater the boiling point. Hence, n-butane has a higher boiling point than than propane.
Also, if we compare the boiling points of 1-butanol to that of diethyl ether, we will discover that 1-butanol has a higher boiling point mainly due to intermolecular hydrogen bonding influences.
A given compound has the following solubility properties. At room temperature, it is soluble in diethyl ether but insoluble in both ethanol and water. At higher temperatures, it is soluble in both diethyl ether and ethanol, but insoluble in water. Propose a procedure for purifying this compound by recrystallization.
Answer:
See explanation
Explanation:
If we desire to recrystallize the given compound then we must do the following;
1) Add the compound to ethanol and heat the system
2) As the solute dissolves, the solution is allowed to cool
3) The solution may be seeded or the vessel scratched to aid crystallization.
4) The pure crystals are now filtered out, washed and dried.
Remember that recrystallization has to do with dissolving a solute in a solvent in which it is only soluble at high temperature but insoluble at low temperature.
The solvent dissolves the impure solute while pure crystals emerges as the temperature decreases.
ou are a work study for the chemistry department. Your supervisor has just asked you to prepare 500 mL of 3 M HCl for tomorrow’s undergraduate experiment. In the stockroom explorer, you will find a cabinet called "stock solutions". Open this cabinet to find a 2.5 L bottled labeled "11.6 M HCl". The concentration of the HCl is 11.6 M. Please prepare a flask
Answer:
Add to a 500mL volumetric flask 300mL of water, the 129mL of the 11.6M HCl solution and then complete to volume with water
Explanation:
To make 500mL = 0.500L of a 3M HCl from the 11.6M HCl stock we need first to find the moles of HCl we need:
Moles HCl:
0.500L * (3mol / L) = 1.5 moles of HCl are needed
These moles are obtained from the 11.6M HCl solution. The volume required is:
1.5mol * (1L / 11.6moles HCl) = 0.129L = 129mL must be added to the solution.
That means to prepare the 500mL of the 3M HCl you need to:
Add to a 500mL volumetric flask 300mL of water, the 129mL of the 11.6M HCl solution and then complete to volume with water
Answer:
Calculation: 11.6 M × V = 3.0 M × 0.500 liters
V = 0.13 liters
Steps for dilution:
Measure out 0.13 liters of the concentrated solution of 11.6 M HCl using a volumetric pipet.
Transfer this into solution into a 500 milliliter volumetric flask.
Add water to the flask until it reaches a total volume of 500 milliliters.
Solution: V = 0.13 liters
Explanation:
What are the different elements that make up a molecule of glucose?
Answer:
Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. You will be building one type of sugar called glucose.
Explanation:
a rock that is pushed down a hill represents both potential and kinetic energy. which statement best represents the energy transformation involved in this scenario
Explanation:
kinetic energy Increases due to gravity. A rock being pushed down a hill increases in speed, due to gravity, what goes up must come down....
One way to represent this equilibrium is: 2 Al(s) 3 Br2(l)2 AlBr3(s) We could also write this reaction three other ways, listed below. The equilibrium constants for all of the reactions are related. Write the equilibrium constant for each new reaction in terms of K, the equilibrium constant for the reaction above.
The question is incomplete, the complete question is;
Aluminum metal and bromine liquid (red) react violently to make aluminum bromide (white powder). One way to represent this equilibrium is:
Al(s) + 3/2 Br2(l)AlBr3(s)
We could also write this reaction three other ways, listed below. The equilibrium constants for all of the reactions are related. Write the equilibrium constant for each new reaction in terms of K, the equilibrium constant for the reaction above.
1) 2 AlBr3(s) 2 Al(s) + 3 Br2(l)
2) 2 Al(s) + 3 Br2(l) 2 AlBr3(s)
3) AlBr3(s) Al(s) + 3/2 Br2(l)
Answer:
See explanation
Explanation:
We have that; Al(s) + 3/2 Br2(l)AlBr3(s)
So;
Al(s) + 3/2 Br₂(l) = AlBr₃(s)
K = [ AlBr₃] / [ Al] [ Br₂]³/²
K² = [ AlBr₃]² / [ Al ] ² [ Br₂]³
Now;
1) 2 AlBr₃ = 2 Al(s) + 3 Br₂(l) =
K₁ = [ Al ] ² [ Br₂]³ / [ AlBr₃]²
K₁ = ( 1 / K² ) = K⁻²
For the second reaction;
2 ) 2 Al(s) + 3 Br₂(l) = 2 AlBr₃(s)
K₂ = [ AlBr₃ ]² / [ Al ]² [ Br₂ ]³
K₂ = K²
For the third reaction;
3 )
AlBr₃(s) = Al(s) + 3/2 Br₂(l)
K₃ = [ Al ] [ Br₂ ] ³/² / [ AlBr₃ ]
= ( 1 / K ) = K⁻¹
Which upgrade to a school will most likely reduce the school's consumption of
nonrenewable resources?
Answer: if they use solar collection panels
Explanation:
How does latitude affect water temperature? Choose ALL that apply Lesson 2.05 none of the choices Temperatures are greatest at low altitudes because of the proximity to the equator As you move to higher latitudes approaching the poles, the temperature decreases. Temperatures are lowest at low altitudes because of the proximity to the equator
Answer:
I think it's option 3 (From top to bottom)
Explanation:
When the water is at a higher altitude there's only about 40 percent heat that the equator does.
When investigating a factor that effects the rate of photosynthesis, you needed to keep the
plant at a temperature of 250C. How did you do this?
Answer:
Photosynthesis defines the process by which plants and some bacteria manufacture glucose. Scientists summarize the process as follows: using sunlight, carbon dioxide + water = glucose + oxygen. The process occurs within special structures called chloroplasts located in the cells of leaves. Optimum photosynthetic rates lead to the removal of greater amounts of carbon dioxide from the local atmosphere, producing greater amounts of glucose. Since glucose levels within plants are difficult to measure, scientists utilize the amount of carbon dioxide assimilation or its release as a means to measure photosynthetic rates. During the night, for example, or when conditions are not prime, plants release carbon dioxide. Maximum photosynthetic rates vary between plant species, but crops such as maize can achieve carbon dioxide assimilation rates as high as 0.075 ounce per cubic foot per hour, or 100 milligrams per decimeter per hour. To achieve optimum growth of some plants, farmers keep them in greenhouses that regulate conditions such as humidity and temperature. There are three temperature regimes over which the rate of photosynthesis changes.
Low Temperature
Enzymes are protein molecules used by living organisms to carry out biochemical reactions. The proteins are folded into a very particular shape, and this allows them to bind efficiently to the molecules of interest. At low temperatures, between 32 and 50 degrees Fahrenheit – 0 and 10 degrees Celsius – the enzymes that carry out photosynthesis do not work efficiently, and this decreases the photosynthetic rate. This leads to a decrease in glucose production and will result in stunted growth. For plants inside a greenhouse, the installation of a greenhouse heater and thermostat prevents this from occurring.
Explanation:
Predict the chemical formula of the compound that will form when Li and o interact.
Answer:
[tex]Li_2O[/tex]
Explanation:
Hello!
In this case, when looking over the chemical formula of a compound formed when two elements interact, we need to realize about their location in the periodic table; thus, since lithium is a metal and oxygen a nonmetal, we infer lithium turns out the cation and oxygen the anion. Moreover, as the oxidation state of lithium is 1+ and that of oxygen is 2-, we can set up the chemical formula as follows:
[tex]Li^+O^{2-}\\\\Li_2O[/tex]
Best regards!
What would be the mass of 300 liters of dinitrogen monoxide
at STP?
Answer:589 g
Explanation:just answered the question
How many molecules are in 97.21 grams of Sodium Chloride (NaCl)?
How to get the density of this unknown liquid?
Answer:
Measure the volume of water poured into a graduated cylinder, then place the object in the water and remeasure the volume. The difference between the two volume measurements is the volume of the object. Now simply divide the mass by the volume to calculate the density of the object.
(ILL GIVE 100 POINTS AND EDIT IT AND MARK BRAINLIEST) Examine the diagram of the cell cycle. Which label identifies the stage in which the DNA is copied and the cell grows? W X Y Z
Answer:
where is diagram. sorry.
True or false questions?
Most metal elements are brittle and do not conduct electricity. True or False
Any element can be identified by counting the protons in its neucleus. True or False
All Earths matter is made from the combination of about 100 elements. True or false
Answer:
1. False 2.True3.True? Unsure
Explanation:
Help me please (btw I live in the U.S)
Answer:
I live in the USA so the questions have been answered to reflect that accordingly.
1. The letter which represents summer where I live is Letter C
Explanation:
Letter C represents the June solstice which usually takes place between June 20 and June 21.
2. The letter which represents winter where I live is letter A.
Explanation:
Letter A represents the December solstice. Another name for this is Winter Solstice. This usually takes place in December for those living in the Northern Hemisphere like me. It is projected that this will take place on Tuesday, 21 December 2021.
Another name for this is Northern Hemisphere Winter Solstice as it marks the first day of winter.
3. The correct seasons for June Solstice are:
Northern Hemisphere: Summer Solstice
This projected to occur on Sunday, 20 of June 2020. It will be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.
4. Southern Hemisphere: Summer solstice
This is anticipated on Tuesday, 21 December 2021. It will also be characterized by 1 hour of twilight and approximately 10 hours each of daylight and night time.
5. Northern Hemisphere: Autumnal (Fall) Equinox
6. Southern Hemisphere: Spring (Vernal) equinox
7. December Solstice - Northern Hemisphere: Winter Solstice is the Day of the Year with the shortest amount of sunlight
8. December Solstice - Southern Hemisphere: Summer Solstice. This is the day of the year with the longest amount of sunlight
9. March Equinox - Northern Hemisphere: Spring (Vernal) Equinox. This is the start of spring.
10. March Equinox - Southern Hemisphere: Autumnal (Fall) Equinox. This is the start of Fall.
Cheers!
Ok so I don't understand how to do this-
Can someone explain how?
Shanghai, China (31° N, 121° E)
1. 24-hr Average Yearly Temperature in ºC
2. Total Yearly Precipitation in mm
Answer:
Oh, you are supposed to look up the yearly temp, and yearly rain for a certain area. I did this before!