explain why boiling is a reversible change
Answers
Answer:
This is a reversible change. Similarly, if you boil water, it evaporates and becomes water vapor. When you cool this vapor down, it turns back to water. A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change.
Explanation:
When we boil water by heating, then it changes into steam. Now, if we cool the steam, then water is formed again. So, the changing of water into steam has been reversed by cooling. Thus, the boiling of water (or evaporation of water) is a reversible change.
Related Questions
1. All ___matter______ is made of atoms that cannot be ______________________ or ____________________. 2. All _______________ of a given __________________ are ___________________ in mass and __________________.
Answers
Answer:
All the matter that is made of atoms that cannot be broken or beaten into thin sheet .2All matters of a given book are in mass and mixture
What does gene therapy use and why?
Answers
Give the stereochemical relationship between each pair of structures. Examples are same compound, same compound (meso), constitutional isomers, enantiomers or diastereomers [3 marks) CH , ОН сн; Н Н. НО. Н. ОН НО. Н CH . Сн, Н H Н Осн, CH; Br Сн, не -Br H₂C" Он Он H Н H Н Н H
Answers
The stereochemical relationship between the given pairs of structures are CH3CH(OH)CH3 and CH3CHOHCH3, H3C-NH-CH3 and H3C-NO-CH3, H3C-Br and H3C-I.
CH3CH(OH)CH3 and CH3CHOHCH3: These two structures have the same molecular formula (C4H10O) but differ in their connectivity. They are constitutional isomers, meaning they have the same atoms but arranged in different orders. In this case, one is a straight-chain alkane (propane) with a hydroxyl (-OH) group attached to the central carbon, while the other is an alcohol (2-propanol) with a hydroxyl group attached to one of the terminal carbons.
H3C-NH-CH3 and H3C-NO-CH3: These structures also have the same molecular formula (C3H9NO) but differ in their connectivity. They are diastereomers, which are stereoisomers that are not mirror images of each other and are not enantiomers.
H3C-Br and H3C-I: These structures are constitutional isomers as they have the same atoms but differ in the identity of the halogen atom bonded to the carbon atom. One structure has a bromine (Br) atom, while the other has an iodine (I) atom.
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Which of the following pairs of substances form a buffer system for human blood?
A.
HCl and Cl-
B.
NH3 and NH2-
C.
H3C6H5O7 and HC6H5O72-
D.
H2CO3 and HCO3-
Answers
Answer:
d. Because those chemicals are easily made when CO2 reacts with water, forming H2CO3 (via carbonic anhydrase
The pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) , Option D
What is a Buffer Solution ?
A buffer is a combination of a weak acid (or base) and a salt that contains the conjugate of that weak acid or base.
A buffer solution is added to maintain the pH of any solution
The buffer of carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) is used to maintain the balance of acid and base in the body.
It is used to maintain the pH level of the body between 7.35 and 7.45 , as the pH level higher than 7.8 and lower than 6.8 can lead to death.
Therefore the pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻) , Option D
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Which equation shows the correct relationship between mechanical energy, kinetic energy, and potential energy?
Answers
Answer:
first answer
Explanation:
I need to find the orbit notation
1. Ne - 1s 2s 2p 3s 3p 4s 3d 4p 5s
Answers
Answer:
1s*2 2s*2 2p*6
Explanation:
atomic number of neon is 10 so the s-shell contains 2 electron and p-shell contains 6
What is the mass of 3.35 mol Hg(103)2? (3 points)
1,700 g
1,840 g
1,960 g
2,110 g
Answers
Moles of Mercury Nitrate
200+(14+3(16))2200+(14+48)2200+2(62)200+124324g/molMass
Molar mass×moles324(3.35)1085.4gAnswer:
1,840g
Explanation:
I just took the test and got it right :)
Which of the following substances has the greatest molar entropy under equal conditions and in the same phase?
a. NO2 b. N2O3 c. N2O5 d. NO e. N2O4
Answers
The substance with the greatest molar entropy under equal conditions and in the same phase among the given options is: d. NO
This is because molar entropy increases with molecular complexity. NO has a higher molecular complexity due to its unpaired electron, making its entropy greater than that of the other molecules listed.
Nitric oxide (NO), an odourless, colourless gas, and nitrogen dioxide (NO2), a reddish-brown gas with an offensive odour, are the two gases that are typically referred to as "nitrogen oxides" (NOx). Nitrogen dioxide is created when nitric oxide combines with oxygen or ozone in the atmosphere.
Nitrogen oxide, sometimes known as nitrogen monoxide[1], is an inert gas with the chemical formula NO. It is one of the main nitrogen oxides. Free radical nitric oxide (•N=O or •NO) possesses an unpaired electron, which is commonly indicated by a dot in its chemical formula. As a heteronuclear diatomic molecule, nitric oxide also contributed to the development of early modern theories of chemical bonding.
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6. What type of energy is the result of water and hot matter interacting?
Answers
Boiling water on a stove is an example of thermal energy. Thermal energy is produced when the atoms and molecules in a substance vibrate faster due to a rise in temperature.
3x10^23 molecules of water = _____ moles of water
Answers
Here, 3x10^23 molecules of water are equal to 0.5 moles of water.
There are many ways to find the number of moles of a compound, but to convert the number of molecules of water to moles of water, Avogadro's number needs to be known.
The formula used to find the number of moles is:
moles = (Number of molecules) / (Avogadro's number)
As Avogadro's number = 6.022 x 10^23 molecules/mole.
The given number of molecules is 3x10^23.
Putting the values in the above equation;
(3 x 10^23 molecules of water) / (6.022 x 10^23 molecules/mole) = 0.498 moles of water
Rounding off the value gives 0.5 moles of water.
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Look at this glass of soda. Use your knowledge of thermal energy transfer to explain how heat is affecting the following things: ice, soda, glass, and surrounding air.
Answers
Explanation:
Technically, the ice cube melts because the water cools down. This may sound ridiculous at first, but you must consider the fact that the ice melts because it has drawn "heat" (energy) from its surroundings. The "surroundings" being the air and water that surround it (but the water's more important since it's a better conductor of thermal energy).
The surrounding air looses energy while the ice in the glass gains energy.
We know that thermal energy is transferred from a hotter body to a cooler body. If we look as the glass, we will notice that the surrounding air has a greater energy compared to the contents of the glass. The surrounding air looses this energy resulting in the condensation of water vapor in air around the glass.
Similarly, the ice in the glass gains energy and melts. A change of state occurs from solid to liquid as a result of the energy absorbed from the surrounding air.
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If wind blows over uneven land it becomes A. Weak. B. Gusty. C. Warm. D. Stronger
Answers
If wind blows over uneven land it becomes Gusty. The correct option to this question is D.
When wind blows over uneven land, it interacts with the various features and obstacles on the terrain, such as hills, valleys, and buildings.
This interaction causes the wind to change its direction and speed, leading to gusty conditions. Gusty winds are characterized by sudden, brief increases in wind speed, followed by a period of relatively calmer wind.
In addition to creating gusty winds, uneven terrain can also affect other aspects of wind behavior. For example, wind can be funneled through valleys or become blocked by hills and mountains, leading to localized variations in wind patterns. Additionally, the surface roughness of the terrain can influence the wind's overall speed and strength. However, the primary effect of uneven terrain on wind is the development of gusty conditions.
Wind blowing over uneven land becomes gusty due to its interaction with the various features and obstacles on the terrain. This leads to sudden changes in wind speed and direction, creating gusty winds.
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identify the most likely cause of earthquakes that occur in the area shown on the map
Answers
The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.
What are earthquakes?Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.
They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.
The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.
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What best describes what the pH number indicates about a solution?
O A. How acidic the solution is
B. What its ionic strength is
O C. How strong the acid is
O D. What the Ka constant is
Answers
Answer:
A. How Acidic the solution is
Explanation: pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
Answer:
A
Explanation:
The pH of a solution indicates it's acidity or alkalinity. The pH scale is an inverse logarithm that ranges from 0 to 14. Anything below 7.0 (ranging from 0.0 to 6.9) is acidic and anything above 7.0 ( from 7.1 to 14. 0) is basic or alkaline.
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Dennis had a history of heart disease in his family and was reducing his intake of saturated fats. Saturated means each carbon atom is bonded to as many hydrogen atoms as it can accept. If a carbon were bonded to two carbons, how many hydrogens could it accept
Answers
If a carbon atom were bonded to two other carbon atoms, it could accept a maximum of two hydrogen atoms.
In organic chemistry, the concept of saturation refers to the number of bonds a carbon atom forms with other atoms, particularly hydrogen atoms. A saturated carbon atom is bonded to as many hydrogen atoms as it can accept, maximizing its bonding capacity.
A carbon atom can form up to four bonds. In the case where a carbon atom is bonded to two other carbon atoms, it still has two available bonding sites. Since each bonding site can accept one hydrogen atom, the carbon atom can accept a maximum of two hydrogen atoms.
If a carbon atom is bonded to two other carbon atoms, it can accept a maximum of two hydrogen atoms. This concept of saturation helps us understand the bonding capacity of carbon atoms and the potential number of hydrogen atoms they can accommodate in a molecule.
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Consider a heat engine cycle consisting of isochoric heating, isothermal expansion, and isobaric contraction. The initial state of the monatomic ideal gas in the engine just prior to isochoric heating
Answers
The first state of the monatomic ideal gas in the engine before isochoric heating is often called State 1. The gas in this state can have specific features like temperature, pressure, and volume.
Let's discuss the properties of the gas in State 1:
1. Temperature: The letter T with a subscript of 1 denotes the temperature of the gas in State 1. It indicates the original temperature of the gas before any heating occurs.
2. Pressure: We can represent the pressure of the gas in State 1 as P1. It demonstrates the starting pressure of the gas prior to any heating happening.
3. Volume: We can represent the volume of the gas in State 1 as V1. Since the process is isochoric (constant volume), the volume remains unchanged during this stage.
Remember that the exact values of these properties (T1, P1, V1) would be influenced by the particular conditions and parameters of the heat engine cycle.
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updated q- Consider a heat engine cycle consisting of isochoric heating, isothermal expansion, and isobaric contraction. The initial state of the monatomic ideal gas in the engine just prior to isochoric heating. Discuss the properties of the gas in State 1.
A grocer carefully lifts a 100 N crate of apples a distance of 1.5 m to a shelf in 2.5 seconds. What is his power output?
Answers
The grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time.
Power is defined as the rate at which work is done or energy is transferred. It can be calculated using the formula: Power = Work / Time.
In this case, the work done by the grocer is equal to the force applied multiplied by the distance moved. The force applied is 100 N and the distance moved is 1.5 m, so the work done is:
Work = Force * Distance
Work = 100 N * 1.5 m
Work = 150 Joules
The time taken to perform the work is 2.5 seconds. Now we can calculate the power output:
Power = Work / Time
Power = 150 Joules / 2.5 seconds
Power = 60 Watts
Therefore, the grocer's power output is 60 Watts. Power is measured in Watts, which represents the rate of energy transfer or work done per unit time. It indicates how quickly the grocer is able to lift the crate of apples to the shelf.
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Which orbital is portrayed on the right?
Answers
A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.
What's the appearance of the p orbital?A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.A maximum of two electrons will be placed in 1s first. With a maximum of two electrons, 2s will then be filled. With a maximum of 6 electrons, 2p will then be filled.Each shell can only carry a certain amount of electrons: the first shell can hold two electrons, the second shell can hold eight electrons (2 + 6) and so on, the third shell can hold 18 electrons (2 + 6 + 10).To learn more about orbital refer to:
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If pesticides must be stored on the premises, which location is the best choice?Gnaw marks on wood, metal, or concreteIn a closet with cleaning chemicalsSome chemicals are not approved for use in foodservice operations.
Answers
The best choice for storing pesticides on the premises would be a location that is secure and separate from other chemicals or materials.
Pesticides are potentially hazardous chemicals that can cause harm to humans and animals if they are not handled properly. Therefore, it is important to store them in a secure location that is inaccessible to unauthorized personnel.
Gnaw marks on wood, metal, or concrete could indicate the presence of pests, which could lead to contamination of the pesticides. A closet with cleaning chemicals may not be the best choice, as mixing cleaning chemicals with pesticides could create a dangerous reaction.
Additionally, some chemicals are not approved for use in foodservice operations, so it would not be appropriate to store them in areas where food is prepared or stored. The best choice for storing pesticides would be a designated area that is secure, well-ventilated, and away from other chemicals or materials that could potentially cause a reaction or contamination.
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Calculate the density of pentane with a mass of 47 grams and a volume of 75 mL.
Answers
Answer:
The answer is
0.63 g/mLExplanation:
The density of a substance can be found by using the formula
\(density = \frac{mass}{volume} \\\)
From the question
mass = 47 g
volume = 75 mL
The density is
\(density = \frac{47}{75} \\ = 0.626666666...\)
We have the final answer as
0.63 g/mLHope this helps you
Osmium has a density of 22.6 g/cm^3. What volume (in cm 3) would be occupied by a 21.8 g sample of osmium?
Answers
The volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\).
The volume (in \(cm^3\)) occupied by a 21.8 g sample of osmium can be calculated using its density of \(22.6 g/cm^3\).
To find the volume, we can use the formula:
Volume = Mass / Density.
Plugging in the values, we have:
Volume = 21.8 g / \(22.6 g/cm^3\)
Now, dividing 21.8 g by \(22.6 g/cm^3\) gives us the volume in cm^3.
Calculating this, we get:
Volume = \(0.964 cm^3\)
So, a 21.8 g sample of osmium would occupy a volume of approximately \(0.964 cm^3\)
In conclusion, the volume occupied by a 21.8 g sample of osmium is approximately \(0.964 cm^3\)
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What happens to pyruvate in the absence of oxygen?
Answers
Pyruvate undergoes fermentation, which transforms it into lactic acid inside the absence of oxygen.
The breakdown of the drug occurs throughout this process. similar to how pyruvate is converted into lactic acid.
An organic acid contains lactic acid. Its chemical formula is CH 3CH(OH)COOH.
It serves as a synthesis precursor inside a number of biochemical as well as molecular synthesis industries.
The final result of the glycolysis pathway, pyruvate, is transformed into lactic acid inside the lack of oxygen.
Glycolysis
The process through which glucose gets broken down to provide energy is known as glycolysis.
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SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Snapping an instant cold pack is a
Change in temperature
Formation of gas/bubbles
Formation of precipitate
Release of energy (fire/light)
Change in color
Answers
Answer:
Formation of precipitate?
Explanation: When you do that the thingy dissolves the thingy so the thingy dissolves into nothingness of the nothing...
the kinetic theory of gases describes a gas as a large number of atoms or molecules in constant, rapid, random motion.select one:truefalse
Answers
True. The statement that the kinetic theory of gases describes a gas as a large number of atoms or molecules in constant, rapid, random motion is true.
What is the kinetic theory of gases? The kinetic theory of gases is a scientific theory that explains how particles in gases behave. The theory explains that gases are made up of tiny particles called atoms or molecules that are in constant motion. The particles move around in a random and rapid manner in all directions. The kinetic theory of gases describes a gas as a large number of atoms or molecules in constant, rapid, random motion. The term "constant" refers to the fact that the motion of the particles never stops, as they have a lot of kinetic energy. They are constantly colliding with one another and the walls of their container. Conclusion refers to the final thoughts or observations made after an experiment or study. It summarizes the findings and presents recommendations, if any. The kinetic theory of gases describes the behavior of gas particles, which are composed of atoms or molecules in motion. It suggests that these particles are in a state of constant, rapid, random motion. The particles move around in all directions and collide with one another and the walls of their container. The kinetic energy of these particles causes them to move at different speeds, with some moving faster than others. This theory helps us understand how gas particles behave, and it has many practical applications. For example, it can be used to explain why gases expand when heated and why pressure increases when the volume of a gas is reduced.
The kinetic theory of gases is an important scientific theory that helps us understand the behavior of gas particles.
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The hydrolysis of esters in base is called ________. a. the hunsdiecker reaction b. transesterification c. saponification d. the dieckmann condensation
Answers
The hydrolysis of esters in base is called saponification .
So, option C is correct one.
The saponification is the process that involves conversion of fats , oils , lipids into soap and water in the presence of alkaline medium. Saponification is the process of making soap.
During the saponification process, the mixture has an acidity, which tells that it's not safe for usage. After the saponification process is complete, the pH should be a base.The process of formation of carboxylic salt and water by hydrolysis of ester in base is called saponification.
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At which point is the slump block located?
Answers
Explanation:
At 4th point the slump block is located
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It is point 2, for anyone who sees this is the future
What is your estimate of the strength for each clay type at 50% water content, with DI water as its pore fluid, and with brine in its pore fluid? - Is there a significant difference? If so, what physical mechanism do you think is causing the change in strength? What is the effect of salt on the shear strength of clays?
Answers
The physical mechanism causing the change in strength when using brine as the pore fluid is the presence of salt ions that weaken the interparticle bonds. Salt can reduce the shear strength of clays by increasing the repulsive forces between clay particles.
The strength of clay types at 50% water content can vary depending on whether DI water or brine is used as the pore fluid. Generally, there is a significant difference in strength between the two.
The presence of salt in brine can have an effect on the shear strength of clays. When salt is dissolved in water, it creates ions that can interact with the clay particles. These interactions can lead to the formation of electrical double layers around the clay particles, which can increase the interparticle repulsion and decrease the shear strength of the clay.
On the other hand, when DI water is used as the pore fluid, there is no presence of salt ions to affect the interparticle interactions. As a result, the clay particles can have stronger bonds and higher shear strength compared to when brine is present.
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what will be the result of the reaction
(CH3COO)2+redP +Cl2
Answers
Answer:
(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl
Explanation:
This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.
MULTIPLE CHOICE QUESTION
You shouldn't believe scientific theories
because they are "just a theory" and not
a law.
Answers
Usually scientific law is description of the phenomenon observed but it doesn't explain why or what of that particular phenomenon .
What is the difference between scientific law and scientific theories?1) Scientific law predicts the results of certain initial conditions and scientific theories are the explanation of that particular condition or phenomenon.
Theories do not become law until repeated experiment, no matter the amount of supporting evidence.
examples of theories are Oparin and haldane theory, cell theory, germ theory .
Examples of Scientific Laws Newton's law, laws of inheritance, laws of reflection and Rarefraction .
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How does the proximity to water affect temperature and precipitation in the tropical, temperate, and polar zones?
written answer
science
Answers
Answer:
Water heats and cools more slowly than landmasses.
Explanation:
because the coastal regions will stay cooler in summer and warmer in winter but creating a more moderate climate with a narrower temperature range.