Answer:
Chemistry is a branch of a science which explain about study of composion properties and the transformation or change of matter.
Give the relation of energy (E) and frequency (v) as given by Planck. Calculate the frequency and energy of a photon of radiation having wavelength 3000°A.
Pls answer correctly,need it urgently...
Solution:-1
[tex]\\ \sf\longmapsto E=hv[/tex]
E denotes to Energy h denotes to planks constantv denotes to frequency.Solution:-2
Wavelength=3000Å[tex]\boxed{\sf \lambda=\dfrac{c}{v}}[/tex]
[tex]\\ \sf\longmapsto v=\dfrac{c}{\lambda}[/tex]
[tex]\\ \sf\longmapsto v=\dfrac{3\times 10^8m/s}{3000\times 10^{-10}m}[/tex]
[tex]\\ \sf\longmapsto v=0.001\times 10^{18}s^{-1}[/tex]
[tex]\\ \sf\longmapsto v=1.0\times 10^{15}s^{-1}[/tex]
Now
[tex]\\ \sf\longmapsto E=hv[/tex]
[tex]\\ \sf\longmapsto E=6.626\times 10^{-34}Js\times 1.0\times 10^{15}s^{-1}[/tex]
[tex]\\ \sf\longmapsto E=6.6\times 10^{-19}J[/tex]
why water can reduce unpleasant smell that produce from methane gas ?
Answer:Water contains Oxygen the purified the methane gas
Explanation:
PLS HELP! WILL MARK BRAINLIEST!!! 50 PTS
Answer:
from the pic:
[tex]empirical \: formular : \: \: C _{2}H _{3}O _{2}[/tex]
since molar mass is 118.084 g/mol;
[tex](C _{2}H _{3}O _{2}) _{n} = 118.084 \\ C _{2n}H _{3n}O _{2n} = 118.084 \\(12 \times 2) _{n} + (1 \times 3) _{n} + (16 \times2 ) _{n} = 118.084 \\ 24_{n} + 3_{n} + 32_{n} = 118.084 \\ 59_{n} = 118.084 \\ n = 2[/tex]
[tex]{ \boxed{ \bf{molecular \: formular : \: C _{4}H _{6}O _{4}}}}[/tex]
It is an aldehyde with structure ( second pic )
Answer:
It is an aldehyde with structure
A mixture of three gases A, B, and C have a total pressure of 8.15 atm. The partial pressure of gas A is 2.70 atm. The partial pressure of B is 2.09 atm. What is the partial pressure of gas C?
a
2.45 atm
b
5.67 atm
c
1.35 atm
d
3.36 atm
Answer:
for this question i think the answer is 1.35 atm
Question 2 Multiple Choice Worth 2 points)
(01.01 LC)
Which of the following is a characteristic of science?
O Reproducible by other scientists
The personal opinion of the scientist
Using vanable conditions for each test
O Including only the data that supports a hypothesis
Question 3 Multiple Choice Worth 2 points)
Answer:
Reproducible by other scientists
The personal opinion of the scientist
Using vanable conditions for each test
Explanation:
Hỗn hợp E gồm hai este đơn chức X và Y (MX< MY). Thủy phân hoàn toàn 0,11 mol E cần vừa đủ
120 ml dung dịch NaOH 1M, chưng cất dung dịch sau phản ứng, thu được ancol propylic và 8,78 gam hỗn
hợp Z gồm ba muối. Phần trăm khối lượng của Y trong E là
Answer:
write in English bro? can you?
Explanation:
I can't understand your language sorry .
A machine uses filtration to separate a component from orange juice. Which component does the machine most likely separate from the mixture?(1 point)
water
water
pulp
pulp
sugar
sugar
pigment
Which method of separation would be most appropriate for separating a mixture of water and alcohol?(1 point)
chromatography
chromatography
distillation
distillation
filtration
filtration
evaporation
Which method separates components of a mixture according to how quickly the particles travel through a medium?(1 point)
chromatography
chromatography
filtration
filtration
evaporation
evaporation
distillation
The boiling point of water is 100ºC. The boiling point of acetone is 56ºC. Which statement about distilling a mixture of acetone and water is correct?(1 point)
Acetone remains in the original container.
Acetone remains in the original container.
Acetone is captured and cooled.
Acetone is captured and cooled.
Water is collected as it leaves the mixture.
Water is collected as it leaves the mixture.
Water will vaporize from the mixture before acetone.
Substance A and substance B are mixed together. To separate the mixture, water is added, and substance A is filtered out. Then, the remaining liquid is heated to remove the water, leaving a residue of substance B. Which statement about substance A and substance B could be correct?(1 point)
Substance A is rice, and substance B is sugar.
Substance A is rice, and substance B is sugar.
Substance A is sand, and substance B is alcohol.
Substance A is sand, and substance B is alcohol.
Substance A is alcohol, and substance B is salt.
Substance A is alcohol, and substance B is salt.
Substance A is sugar, and substance B is instant coffee.
Pulp
distillation
chromatography
Acetone is captured and cooled.
Substance A is rice, and substance B is sugar.
To separate the components of a mixture the substances to be separated must differ in a given physical property.
In chemistry, there are diverse separation techniques used to separate the components of a mixture. Separation depends on differences in a given physical property such as boiling point, solubility in a solvent, difference in particle size etc.
Filtration can be used to separate a solid from a liquid hence it can be used to separate pulp from orange juice.
To separate water and alcohol, distillation is used because such a separation depends on the difference in the boiling points of water and alcohol. Water boils at a higher temperature than alcohol hence the mixture can be separated by distillation.
Chromatography is a method of separation that is dependent on how quickly a the components of a mixture move through a stationary phase.
Acetone has a lower boiling point than water hence it collected first and cooled before water.
Clearly, substance A must be a solid since it is filtered out after adding water. Substance B must be a water soluble substance which can be recovered from water by evaporation to dryness. Hence substance A is rice, and substance B is sugar.
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Which statement correctly describes the relationship between thermal energy and particle movement?
1 As thermal energy increases, particle movement does not change.
2 As thermal energy increases, it is not possible to predict particle movement.
3 As thermal energy increases, there is less particle movement.
4 As thermal energy increases, there is more particle movement.
The correct statement that describes the relationship between thermal energy and particle movement is "As thermal energy increases, there is more particle movement".
WHAT IS THERMAL ENERGY?
Thermal energy is the energy that emanates from heat or change in temperature. Thermal energy is directly proportional to the movement of particles. This means that an increase in thermal energy depicts an increase in the kinetic energy (energy due to motion) of the particles involved.Hence, as thermal energy of substance increases, there is more particle movement of that substance.
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What is the balanced form of the chemical equation shown below?
Cr(s) + Cl2(g) → CrCl3(s)
The balanced equation for the chemical equation given in the question above is: 2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)
How do i balance equation?The following data were obtained from the question:
Cr(s) + Cl₂(aq) → CrCl₃(s)Balanced equation =?Chemical equations are generally balanced by ensuring that the number of atoms of each element present on both sides of the equation are equal.
Now, we shall balance the equation given from the question as follow:
Cr(s) + Cl₂(aq) → CrCl₃(s)
There are 2 atoms of Cl on the left side and 3 atoms on the right side. It can be balanced by writing 2 before CrCl₃ and 3 before Cl₂ as shown below:
Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)
There are 2 atoms of Cr on the right side and 1 atom on the left side. It can be balanced by writing 2 before Cr as shown below:
2Cr(s) + 3Cl₂(aq) → 2CrCl₃(s)
Thus, the equation is balanced.
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Are all elements atoms and are all atoms elements?
Answer:
yes
Explanation:
because is smallest element that are made up of atom
Answer: Yes
Explanation:
Describe how methane is
formed in terms of chemical bonding
which one is it…need help ASAP!!!
in order to decrease the freezing point of 500. g of water to 1.00° c how many grams of ethylene glycol (C2H602)must be added (KF=1.86°C kg solvent)
Answer:
if wrong sorry ok????
Assertion (A): An orbital cannot have more than two electrons, moreover, if an orbital has two electrons they must have opposite spins.
Reason (R): No two electrons in an atom can have the same set of all the four quantum
numbers.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) Both A and R are false.
pls answer
Answer:
the correct answer is option ( A )
Both A and R are true and R is the correct explanation of A.
Explanation:
hope it helps you
Mark my answer as brainlist
have a nice day
Which of the following is an example of the geosphere interacting with the atmosphere?Streams become muddy due to erosion.
Volcanic eruptions release gases into the air.
Rocks crack open when water in the cracks freeze.
Plants absorb carbon dioxide and produce oxygen.
Answer:
Volcanic eruptions release gases into the air.
Explanation:
This is because the atmosphere collects the gas from the volcano, the volcano is apart of the geosphere because it is a part of the earth's surfaces.
two drops of mercury on a flat surface are rolled towards each other. When they make contact with each other they fuse to form one drop.Why?
Answer:1) It is due to large cohesive force acting between the molecules of mercury that the droplets of mercury when brought in contact pulled together to form a bigger drop in order to make potential energy minimum. The temperature of this bigger drop increases since the total surface area decreases.
2) A spherical shape has the minimum surface area to volume ratio of all geometric forms. When two drops of a liquid are brought in contact, the cohesive forces between their molecules coalesce the drops into a single larger drop. This is because, the volume of the liquid remaining the same, the surface area of the resulting single drop is less than the combined surface area of the smaller drops. The resulting decrease in surface energy is released into the environment as heat.
what are two consents in this experiment
The number of cricket chirps
The temperature of each container
The kind of containers used
The number of crickets in each container
Answer:
the number of crickets in each container
Explanation:
to participate in the experiment you will have to know the crickets in the container
Can you help me on this. I will support your correct answer
Which of the following terms refers to the area immediately around the eye
Answer:
the eye socket
Explanation:
the area around the eye is called the eye socket or the eye orbit.
Patience, a popular card game in Mendeleev's time, is also known as Go Fish.
A. True
B. False
Answer:
B. False
Explanation:
step by step explanation
Answer:
False
Explanation:
A sample of gas has a volume of 20 cm³.The pressure is changed to 90 kPa at constant temperature,while the volume increases to 75 cm³.What was the original pressure of the gas?
Answer:
337.5kPa ~ 338kPa
Explanation:
Using the ideal gas law PV=nRT we have the following definitions from the problem:
V(initial) = 20cm³
P(initial) = ?kPa
V(final) = 75cm³
P(final) = 90kPa
Since we know that the number of moles of the sample did not change, nor did the temperature, nor does the ideal gas constant (R) we can rewrite this equation to state:
P(initial)V(initial) = nRT =P(final)V(final) ~ P(initial)V(initial) = P(final)V(final)
Rearranging this equation as we are solving for the initial pressure we find that:
P(initial) = (P(final)V(final))/V(initial)
P(initial) = ((90kPa)(75cm³))/20cm³
P(initial) = 337.5kPa ~ 338kPA
Why is carbon said to provide a "backbone" in many molecules? (1 point)
Carbon atoms have long narrow shapes, allowing many other atoms to attach to them
Carbon atoms can form chains and branches with each other, and other atoms can attach to these.
Carbon atoms have full shells of electrons, allowing electrical signals to pass through them easily
Carbon atoms have half-full shells of electrons, allowing electrical signals to pass through them easily.
The correct answer is; Carbon atoms can form chains and branches with each other, and other atoms can attach to these.
Organic chemistry is regarded as the chemistry of carbon compounds and carbon atoms are known to catenate.
Organic chemistry is the branch of chemistry that studies carbon compounds. There are thousands of organic compounds in existence.
The common thread that joins all these organic compounds is that they all contain a long or branched chain of carbon atoms linked to each other. This ability of carbon atoms to self-link forming long chains or branches or macrocyclic compounds is called catenation.
The long or branched chain of carbon is therefore the "back bone" or main framework of the compound.
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Answer:
(Question 1) Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?
(Answer) The bonds can shift because valence electrons are held loosely and move freely.
(Question 2) Between which types of elements do ionic bonds occur, and how do electrons act within the bond?
(Answer) metals and nonmetals, electrons transferred
(Question 3) Which kind of bond would occur between sodium (Na, Group IA) and chlorine (Cl, Group VIIA)?
(Answer) ionic
(Question 4) Why is carbon said to provide a “backbone” in many molecules?
(Answer) Carbon atoms can form chains and branches with each other, and other atoms can attach to these.
(Question 5) Which option describes the structure of the electron shells in a neutral carbon atom?
(Answer) The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
Explanation:
i just finished the quick check UwU
Define force and speed
Force = The external energy that changes or tends to change the state of any body or object is called force.
Speed = The rate of distance is called speed.
Answer:
Force is a push or pull which changes or tend to change the position of a body.
The rate of change its position with time or magnitude is called speed.
ii)The outer electronic configuration of an element is 3d8 4s2
.To which group and period it belongs?
Answer:
group ten period four. that's the answer
5. What change would increase the amount of gas able to be dissolved in a given amount of liquid water? (2 points)
Increasing temperature
a
Increasing pressure
Increasing surface area
O
Increasing rate of stirring
answer : increasing pressure
the amount of gas that can be dissolved in liquid water increase with the increase in pressure
Answer:
increasing pressure
Explanation:
what do you mean by Arsenic Pollution?
Arsenic contamination of groundwater is a form of groundwater pollution which is often due to naturally occurring high concentrations of arsenic in deeper levels of groundwater.Arsenic contamination of ground water is found in many countries throughout the world, including the US.
Name the functional group in the following molecule:
CH3CH2NH2
A. amine
B. amide
C. ether
D. thiol
Answer:
(A) Amine
Explanation:
Ch3Ch2Nh2 is an Amine.
An amine is often a functional group with a lone pair on the nitrogen atom. Amines structurally mimic ammonia, where nitrogen can link with up to three hydrogen atoms. Here the correct option is A.
Amines are organic substances that have a lone pair of nitrogen atoms in them. In essence, they are produced by replacing one or more hydrogen atoms in ammonia (NH₃) with an alkyl or aryl group, giving them the names alkylamines and arylamines, respectively.
In addition to medicines and treatments, amines are used to create nylon and azodyes. They are frequently employed in the creation of compounds for the filtration of water, and medicinal, and crop protection.
Thus the correct option is A.
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Explain Froath Flotation Method!
Explanation:
a process for separating minerals from gangue by taking advantage of the differences in their hydrophobicity.
I believe that is accurate
hope this helped have a nice day
and mark me brainiest :)
7. In a remote area of Columbia, kids have to travel to school on a zip-line!
Would school attendance increase if all kids has to get to school on a fun
zip line?
Make a hyphotesis
Help plz!!!
Answer:
yes
Explanation:
Kids like fun things, and school is not fun , so if kids got to go to school on a zipline, attendance would be through the roof!
What is cell wall? Where is it found?
Answer:
A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection. They are found in bacteria, archaea, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls.
Explanation:
