Answer:
Fractional distillation of crude oil in laboratory
Explanation:
In general, we can sort them according to their boiling point.
We should first place a ball of mineral wool soaked with petroleum into a boiling tube and heat it with a Bunsen flame. At the beginning of the experiment, heat the mineral with a gentle flame, and then more strongly later. The fraction with a lower boiling range will distil out first. Since petrol is quite volatile, it should be condensed by cooling with water or an ice-water bath.
Petrol will be collected first, as it has a lower boiling point than kerosene. It will turn into vapour and condense again in the receive tub in the beaker.
calculate the percentage mass of oxgen in water, H2O
Answer:
the mass of oxygen in water is 16.00.
The reason for the trend in the previous question is because Bromine is _________electron density from the carbon the proton is on, resulting in the proton being ___________, thus the proton nuclei is_________ effected by the applied magnetic field leading to a greater difference in energy of the nuclei's spin states.
Answer:
Explanation:
From this question, we are to fill in the blanks with the appropriate correct answers.
[tex]\text{The reason for the trend in the previous question is because Bromine is } \mathbf{withdrawing}[/tex][tex]\text{electron density from the carbon the proton is on, resulting in the proton being }\mathbf{deshielded, }[/tex][tex]\text{thus the proton nuclei is} \ \ \mathbf{more} \ \ \text{effected by the applied magnetic field leading to a }[/tex]
[tex]\text{greater difference in energy of the nuclei's spin states.}[/tex]
NOTE: that the electron-withdrawing groups decrease the electron density around the proton nucleus and therefore the nucleus feels the external magnetic field more. Hence, it requires a larger frequency to attain resonance(downfield).
The action of a tree stump splitting bedrock depicts what type of process?
А. chemical weathering
B. physical weathering
С. deposition
D. erosion
Answer: Physical Weathering
Explanation: It is physical weathering because it is caused by natural elements causing the rock to break. It is not chemical weathering because it is not using any chemical reaction to break the rock. It is not erosion or deposition because it is still not finished with the process with breaking the rock. Think of it this way:
Step 1: Weathering - Breaks rock/stone
Step 2: Erosion - Taking the small bits of rock
Step 3: Deposition - Dropping the rock
Which Video game do you like the most?
Minecraft
Roblux because it won't allow me to say the actually game name
Fortnut same for this one
Call of duty
grand theft auto
Red redemption and
Geometry dash
minecraft or cod
Explanation:
well those are the only games I play but the one I enjoy the most is cod
GD
cnm nmvnvjngggguhygtcdffgvbhnmi
A scientist places 10 ml of water in a test tube and heat it with flaming burner for 2 minutes. The liquid boils and escapes as a steam. This experiment is a good example of a
A chemical change
B physical change
C chemical property
D physical property
1/5 divided by 3/4 fraction
Answer:
4/15
Explanation:
we can write out an equation by doing (1/5 ÷ 3/4) and then switch the sign to multiplication and we can keep the first fraction the same (in this case 1/5) and then we flip the second fraction BUT when we flip the second fraction upside-down we have to change the symbol to multiplication (1/5x4/3)
then after that all we do is multiply the denominators and numerators :)
1 x 4 = 4
_______
5 x 3 = 15
answer would be 4/15
Express these temperatures in degrees Fahrenheit and in kelvins. A.-252.97 C B. -40 C C. 1,064 C
Answer:
A. -423.346 °F, 20.18 K
B. -40°F, 233.15K
C. 1947.2 °F, 1337.15 K
Explanation:
A.
(-252.97 °C × 9/5) + 32 = -423.346 °F
-252.97 °C + 273.15 = 20.18 K
B.
(-40 °C × 9/5) +32 = -40 °F
-40 °C + 273.15 = 233.15 K
C.
(1064 °C ×9/5) + 32 = 1947.2 °F
1064 °C + 273.15 = 1337.15 K
What does the addition of a catalyst do to a reaction?
Answer:
B
Explanation:
It lowers the activation energy required therefore speeding up the reaction
There are eight diastereomers of 1,2,3,4,5,6-hexachlorocyclohexane. One of them is drawn. Draw the other seven in the cyclohexane framework below (5 points). One isomer loses HCl in an E2 reaction nearly 1000 times more slowly than the others. Circle the isomer that reacts so slowly, draw its corresponding chair conformers and explain the reason for the slow rate. (5 points).
Answer:
Attached below diagram of the eight diastereomers
The Isomer that reacts so slowly is DIASTEREOMER 8
Explanation:
The Isomer that reacts so slowly is DIASTEREOMER 8 in an E2 reaction and this is because no pair of chlorine and hydrogen atoms can assume the anti-periplanar orientation that is preferred in an E2 elimination
attached below is Diagram of the eight diastereomers ( screen shot from my drawing tool )
5,6-dimethyl-2-heptyne
Due in 1 hr pls help me
Answer:
Please see the attached pictures.
Explanation:
☆ To ensure that each carbon has 4 bonds, fill the other bonds with Hs.
At which point in its swing does the pendulum have the least gravitational potential energy
Answer:
a
Explanation:
a
When a lead acid car battery is recharged by the alternator, it acts essentially as an electrolytic cell in which solid lead(II) sulfate PbSO4 is reduced to lead at the cathode and oxidized to solid lead(II) oxide PbO at the anode. Suppose a current of 96.0A is fed into a car battery for 37.0 seconds. Calculate the mass of lead deposited on the cathode of the battery.
Answer: 3.73 grams
Explanation:
[tex]Q=I\times t[/tex]
where Q= quantity of electricity in coloumbs
I = current in amperes = 96.0 A
t= time in seconds = 37.0 sec
[tex]Q=96.0A\times 37.0s=3552C[/tex]
The reaction at cathode is:
[tex]Pb^{2+}+2e^-\rightarrow Pb[/tex]
[tex]96500\times 2=193000Coloumb[/tex] of electricity deposits 1 mole of
3552 C of electricity deposits =[tex]\frac{1}{193000}\times 3552=0.018moles[/tex] of Pb
[tex]\text {mass of Pb}={\text{moles}\times {\text{Molar mass}}[/tex]
[tex]\text {mass of Pb}={0.018}\times {207.2g/mol}=3.73g[/tex]
Thus mass of lead deposited is 3.73 g
2. You have a rock with a
volume of 15cm3 and a
mass of 45 g. What is its
density?
Answer:
3 g/cm³
Explanation:
Density= Mass divided by Volume
45÷15= 3
which answer? Is this
Answer:
law of segregation
have a good day!
Explanation:
Give an example of an electrolyte
Answer: sodium chloride water solution
Explanation: Eelctrolyte contains cations and anions which can
Transfer charge
Answer:
some energy drinks like powerade or Gatorade, and some juice drinks to.
Solution Mass of NaCl (9) Volume of water (mL)
A
5.0
50.0
B
5.0
75.0
с
5.0
100.0
D
5.0
125.0
Which of the solutions has the highest salt concentration?
O A Solution B
B. Solution A
O
C. Solution C
D. Solution D
Divide the volume of water with mass of salt and multiply with 100 you'll get the concentration percentage
answer is B, because solution A's percentage is 10%
brainliest plz
PLEASE HELP!!!!!!!
25.0g of Aluminum metal is combined with
45.Og Copper(ll) Chloride to produce Aluminum Chloride
and Copper metal
1. Write and balance the chemical equation.
2. Write the needed mole ratio between reactants.
3. What is the mole ratio you have from the data?
4. What is in excess and what is limited? (Show Work)
5. What is the theoretical yield of Aluminum Chloride?
Answer: 1. [tex]2Al+3CuCl_2\rightarrow 2AlCl_3+3Cu[/tex]
2. 3 moles of [tex]CuCl_2[/tex] : 2 moles of [tex]Al[/tex]
3. 0.33 moles of [tex]CuCl_2[/tex] : 0.92 moles of [tex]Al[/tex]
4. [tex]CuCl_2[/tex] is the limiting reagent and [tex]Al[/tex] is the excess reagent.
5. Theoretical yield of [tex]AlCl_3[/tex] is 29.3 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Al=\frac{25.0g}{27g/mol}=0.92moles[/tex]
[tex]\text{Moles of} CuCl_2=\frac{45.0g}{134g/mol}=0.33moles[/tex]
The balanced chemical equation is:
[tex]2Al+3CuCl_2\rightarrow 2AlCl_3+3Cu[/tex]
According to stoichiometry :
3 moles of [tex]CuCl_2[/tex] require = 2 moles of [tex]Al[/tex]
Thus 0.33 moles of [tex]CuCl_2[/tex] will require=[tex]\frac{2}{3}\times 0.33=0.22moles[/tex] of [tex]Al[/tex]
Thus [tex]CuCl_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Al[/tex] is the excess reagent.
As 3 moles of [tex]CuCl_2[/tex] give = 2 moles of [tex]AlCl_3[/tex]
Thus 0.33 moles of [tex]CuCl_2[/tex] give =[tex]\frac{2}{3}\times 0.33=0.22moles[/tex] of [tex]AlCl_3[/tex]
Theoretical yield of [tex]AlCl_3=moles\times {\text {Molar mass}}=0.22moles\times 133.34g/mol=29.3[/tex]
Thus 29.3 g of aluminium chloride is formed.
calculate the percentage mass of hydrogen in hydrochloric acid, HCI
Answer:
To find the mass percent of hydrogen in hydrogen chloride, we must divide the weight of the hydrogen atom alone by the weight of the entire molecule. Then we multiply by 100% to find the percentage. Thus, 2.77% of the mass of hydrogen chloride is hydrogen.
Explanation:
i hope you understand better
How many Protons, Electrons and Neutrons does Helium-6 have?
Answer:
12 neutrons
2 protons
2 electrons
Answer:
Hello There!!
Explanation:
Helium 6 has:
-two protons
-two electrons
-two neutrons
hope this helps,have a great day!!
~Pinky~
Balancing Chemical Equations
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: C3H8 + 5O2 ---> 3CO2 + 4H2O
Explanation: This is an example!
I hope this helped!
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- Zack Slocum
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A pair of molecular orbitals is formed by.
vitamin B information please
B vitamins play a vital role in maintaining good health and well-being. As the building blocks of a healthy body, B vitamins have a direct impact on your energy levels, brain function, and cell metabolism.
Hope this helps; have a great day!
7. Gasoline is a nonpolar liquid that will float on water. 450 grams of gasoline is spilled into a puddle of water. If the
density of gasoline is 0.665 g/mL, what volume of gasoline is spilled?
The area covered by the matter is called volumes. Each matter has its own volume and surface area.
The correct answer to the question is 677ml of gasoline.
The formula is used for the question is as follows:-
[tex]M = D*V[/tex]
All the data given in the question is as follows:-
M is 450gD is 0.665After putting in the equation, the volume we get is as follows:-
[tex]\frac{450 g }{0.665} = 677mL \ of\ gasoline[/tex]
Hence 677 ml is the volume.
For more information, refer to the link:-
https://brainly.com/question/15804584
What observations and reasoning led to the development of Hubble's Law?
Answer:
Hubble's law says that the universe is expanding outward.
Explanation:
Actually Hubble's law was discovered before the Big Bang theory was formulated. The Big Bang Theory is an attempt to explain the observations that led to Hubble's Law.Before the 1900s the theory was that the universe was eternal and self existent. The idea was that the universe was in a steady state having always existed and would always continue to exist. Albert Einstein even changed the equations in his general theory of relativity to reflect the idea of a steady state. Later he called putting in a fudge factor to result in a steady state the worse mistake of his life.
Hubble observed that most of the universe has a red shift indicating that the universe is expanding and moving away from itself. The further out that the universe is observed the faster it is moving apart.
These observations were inconsistent with a steady state universe.
The Big Bang theory extrapolated backwards. If the universe is expanding and spreading out from itself then further back in time the universe was closer together. The Theory explained Hubble's observations by the idea that at the beginning of time ( for our universe) all the matter and energy were together in one place.
This super dense ball of matter and energy then exploded outwards creating space and time as it is presently observed. The question was would the forces of gravity and black holes bring the matter and energy back together again. The answer found in 1998 was no. The rate of the expansion of the universe is increasing not slowing down and the universe will not collapse back into the super dense ball of matter that it began as.
The Big Bang Theory postulated based on the empirical evidence that our universe had a beginning and it will eventually cease to exist. The conclusion based on Hubble's observations is that matter and energy are not eternal and self existent.
For a nucleus to go through mitosis,
A. it must start with two sets of chromosomes (diploid)
B. it must start with one set of chromosomes (haploid)
C. it can start with one set or two sets of chromosomes (haploid or diploid)
D. it can start with any number of chromosomes
Answer:
A
Explanation:
I had this in a test
In this field of sunflowers variation exists some flowers are tall others short
Answer:
Some flowers are tall, others short, and finally some plants are an intermediate height. The tallest plants shade the shorter; the taller plants are
Explanation:
Which tissues are in both leaves and roots? (select all that apply) A. pistil B. stomata C. xylem D. phloem I NEED ASNSWER NOW
Answer:
Xylem and Phloem
Explanation:
cause
Which of the following wavelengths has the lowest frequency?
10mm
10nm
10km
10cm
10m
Answer:
10m es su respuesta
Explanation:
espero te sirva
Which of the following statements about electronegativity are true? (Select that all apply)
Answer: The question is incomplete and the options are not given but here are d options from another website.
a. Electronegativity increases as you move to the right of the periodic table.
B. Electronegativity is the ability of an atom to attract electrons.
c. A very electronegative atom easily gives up electrons.
d. Electronegativity increases with a decreased number of protons.
The correct options are
a. Electronegativity increases as you move to the right of the periodic table.
B. Electronegativity is the ability of an atom to attract electrons.
d. Electronegativity increases with a decreased number of protons.
Explanation:
This is because Electronegativity is the ability of an element to attract pair of electrons to itself.
Electronegativity increases as a result of increase in protons and when there is more electron pull.
As, the size of an element decreases, the valence electrons are attracted near to the nucleus. Therefore, there is increase in attraction between shared electron and nucleus.
What type of solution would have a pH of 8 ?
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: Weak base
Explanation:
I hope this helped!
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Answer and Explanation:
Solutions that have a pH of 8 would be considered a Weak Base.
This is because a weak base is a base that, upon dissolution in water, does not dissociate completely.
Solutions/liquids that have a pH higher than a pH of 7 are basic solutions, while solutions/liquids that have a pH lower than a pH of 7 are acidic solutions.
When the pH level is closer to 7, it is weak, and when it is far from 7, like if it is 1 or 12, then it is a strong acid/base.
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