How much energy is required to completely vaporize 250 grams of liquid water that is already at 100 degrees Celsius? Show your work & units. Expected Answer = 565,000 J
Answer:
564100J (~ 565000J) of heat energy is required.
Explanation:
The enthalpy of vaporization of water is 2256.4J/g, meaning that 2256.4J of heat is required to convert 1 gram of water at 100 degrees Celcius to steam at 100 degrees Celcius.
In your case, we have 250g of water at 100C and we want to vaporize it to steam (also at 100C).
This requires ΔH = 2256.4(250) = 564100J of heat energy.
During a phase change, thermal energy is changing and temperature is _______
also changing
staying constant
increasing
decreasing
Answer:
Decreasing
Explanation:
A phase change is occuring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.
Explain The energy transformations that takes place as a skateboard coasting on a flat surface slows down and comes to a stop.
Answer:
Friction in the wheels transforms kinetic energy into thermal energy.
Explanation:
Compare the chemical reaction that causes the Statue of Liberty to look green with the chemical reaction that causes a bike to rust.
Both the situations are examples of corrosion. The green colour seen in statue of Liberty is due to the copper oxide formation whereas the resulting in bike parts is due to the formation of iron oxide in the surface.
What is corrosion?Corrosion is a chemical process by which the metals are destroying and change in colour. Metal surface when open to air or water will react with the oxygen forms corresponding oxides.
Corrosion is an electrochemical process where the oxygen acts as the anode and the metal surface cathode where the oxide deposits and the colour changes. Materials containing iron will react with oxygen forms a red iron oxide called rust which then completely corrode the metal.
Similarly, the statues are made of metal alloys containing copper. Copper also reacts with air or water forms the copper oxide which is green in colour that is why the statues are turning to a gree patchy colour over time.
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Anne applies a force on a toy car and makes it move forward. What can be said about the forces acting on the toy car at the moment Anne applies the force?
PLEASE HELP ME ASAP THIS IS DUE IN 10 MINUTES AND I AM STUCK!!
For an investigation, a student records data about four unknown substances.
Picture 1: In comments...
The student then calculates the densities of the unknown substances and compares them with the table of densities of known substances shown below.
Picture 2: In comments
Which unknown substance is most likely carbon?
A. Substance 1
B. Substance 2
C. Substance 3
D. Substance 4
Answer:
c
Explanation:
Identify and define the SI unit for force.
Answer: The SI unit of force is the newton, symbol N.
Explanation:
Red blood cells need iron. They store iron and typically contain more iron than the fluid around them does. Which action would show the blood cells doing active transport?
pushing iron out
bringing iron in
swelling
shrinking
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Answer:
The volume of the sample is equal to the other sample's volume / 2 times 9 to the 14th power so that would be about 369.47 grams
Explanation:
What occurs in a chemical reaction?
Answer: A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
Explanation:
Answer:
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
Explanation:
Brainliest please?
If you get this right, I'll teach you how to out pizza the hut :)
Answer:
Lightning rods (and the accompanying protection system) are designed to protect a house or building from a direct lightning strike and, in particular, a lightning-initiated fire, Static electricity is the result of an imbalance between negative and positive charges in an object. These charges can build up on the surface of an object until they find a way to be released or discharged. One way to discharge them is through a circuit, and An electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it.
Explanation:
Im smart
Which of the following would not be a compound?
A. C6H12O6
B. (SO)4
C. H2O
D. Cl3
Answer:
[tex]cl3[/tex]
Explanation:
[tex]cl3 \: is \: an \: anion \: of \: chlorine \\ hope \: it \: helps \\ and \: pls \: mark \: as \: brainliest[/tex]
Compounds are formed by the combination of atoms of two or more different elements in a fixed ratio to each other. Therefore, Cl3 not a compound. Hence, option D is the correct answer.
Matter can be divided into two categories. Elements and compounds. An element contains particles of only one type which may be atoms or molecules. The compounds contain particles of two or more elements. Some main characteristics of compounds are,
• Homogenous
• Definite melting and boiling points
• Combines in a fixed ratio
• Pure substance
Hence, we can conclude, compounds contain two or more different elements. Therefore, option D is the correct answer.
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In a chemical reaction, __________ are the substances present after the reaction.
Answer:
products
Explanation:
Explanation: Substances present BEFORE a reaction occurs are described as reactants. Substances present AFTER a reaction has occurred are described as products.
What is a wet celled battery composed of? Give an example of a wet celled battery.
Answer:
A wet-cell battery is the original type of rechargeable battery.
An example of a wet cell battery is a lead-acid battery.
Explanation:
Jennifer is applying a constant force to swing a can on the end of a string, as shown here. If the can is moving around the circle at a constant speed, which statement correctly describes the motion of the can?
A.
The can accelerates at every point along the orbit and has changing velocity.
B.
The can has constant acceleration and changing speed.
C.
The can has constantly changing acceleration.
D.
The can moves at a constant velocity.
The statement that correctly describes the motion of the can is D. that the can move at a constant velocity.
Based on the information given, Jennifer is applying a constant force to swing the can. In this case, the force that's being acted on the can is at an unchanging rate.Also, the can is moving around the circle at a constant speed. This implies that the speed of the car reasons the same as it's neither increasing nor decreasing.Based on the information given above, since a constant force is applied by Jennifer, and the can is also moving at a constant speed, then the can move at a constant velocity.
In conclusion, the can move at a constant velocity
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The medulla _____.
interprets signals from the sense organs
controls heartbeat and breathing
controls balance and digestion
coordinates muscle movement
The normal force acts _____ to the surface the object is sitting on.
at a 75-degree angle
perpendicular
parallel
at a 45-degree angle
Answer:
Its perpendicular did the exam :)
Explanation:
The first person to answer this question CORRECTLY will get a BRAINLEST
A plant stands upright after being watered. This is an example of:
A) geotropism
B) a decrease in turgor pressure
C) phototropism
D) an increase in turgor pressure
Answer:
A) geotropism
Explanation:
I hope this helps!
Please give me brainliest!
:}
Answer:
Im pretty sure its d
Explanation:
Im srry if its wrong but I hope this helped and have a great day!
PLZ HELP IM FAILING SCIENCE
Scientists hope to use aerogels to aid in oil spill cleaning process by floating aerogels on water where oil has been spilled. For this to occur how would the density of aerogels compare to the density of seawater? a a. The mass of aerogels must be larger. b b. The volume and mass of aerogels must be larger c c. For the same mass, the aerogel must take up less space. d d. For the same volume, the aerogel must have a smaller mass.
I WILL GIVE BRAINLIEST
Answer:
Cleaning up oil spills and metal contaminates in a low-impact, sustainable and inexpensive manner remains a challenge for companies and governments globally.
But a group of researchers at UW–Madison is examining alternative materials that can be modified to absorb oil and chemicals. If further developed, the technology may offer a cheaper and “greener” method to absorb oil and heavy metals from water and other surfaces.
Aerogels, which are highly porous materials and the lightest solids in existence, are already used in a variety of applications, ranging from insulation and aerospace materials to thickening agents in paints. The aerogel prepared in Gong’s lab is made of cellulose nanofibrils (sustainable wood-based materials) and an environmentally friendly polymer. Furthermore, these cellulose-based aerogels are made using an environmentally friendly freeze-drying process without the use of organic solvents.
It’s the combination of this “greener"material and its high performance that got Gong’s attention.
“For this material, one unique property is that it has superior absorbing ability for organic solvents — up to nearly 100 times its own weight,” she says. “It also has strong absorbing ability for metal ions.”
Treating the cellulose-based aerogel with specific types of silane after it is made through the freeze-drying process is a key step that gives the aerogel its water-repelling and oil-absorbing properties.
Can someone please answer these 2 for me :)) I WILL GIVE BRAINLISTTTTT
gold is the piece of metal which have larger mass.
Explanation:
because it is reactive in nature than copper
A pitcher throws a softball toward home plate. When the ball hits the catcher’s mitt, its horizontal velocity is 32 meters/second. The softball’s velocity goes to 0 meters/second in 0.8 seconds when caught. If the softball has a mass of 0.2 kilograms, what’s the force of the impact? Use F = ma, where .
Answer:
To calculate the force of impact F, first lets calculate the acceleration a of the ball:
a=v/t where v is the velocity of the ball and t is time
a=32/0.8=40 m/s²
To get the force F we need the Newtons second law:
F=m*a where m is the mass of the ball and a is the acceleration.
F=m*a= 0.2*40 = 8 N
So the impact force is F= 8 N.
Explanation:
The Moon takes about one month to orbit Earth. Based on what you have learned and know, there would be two eclipses (one lunar and one solar) every month. Do you think this is realistic? Explain why or why not.
Answer:
it would not be
Explanation:
because the moon doesn't always go into earth's shadow
Answer:
It's true that the moon goes around Earth every month, but it doesn't always get in Earth's shadow. The moon's path around Earth is tilted compared to Earth's orbit around the sun. The moon can be behind Earth but still get hit by light from the sun. ... This is why we don't get a lunar eclipse every month.
Explanation:
The image shows particles of salt dissolved in water.
How will the arrangement of salt particles most likely change?
Salt particles will move toward the left through diffusion.
Salt particles will move toward the left through active transport.
Salt particles will move toward the right through diffusion.
Salt particles will move toward the right through active transport.
Answer:
ITS C
Explanation:
What is force?????????
Answer:
a. s s
Explanation:
thats the bottom line cut stone cold said so
Answer:
Force is a push or pull upon an object from the object's interaction with another object.
Explanation:
Whenever there is an interaction between two objects, there is a force upon each of the objects.
Hope this helps and have a great day!
Need help with this.
Answer: It's C
Explanation: All of the other reaction are physical reaction.
Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temnperature spoon. Which substance will
have heat flow from it to the other substances?
O the milk
O the spoon
O the oatmeal
O the surrounding air
fact check this please
Ceres is a rocky celestial body located in the main asteroid belt. It has a nearly spherical shape and orbits the Sun. There are several asteroids in its orbit. Based on this information, which type of body is Ceres?
A.
asteroid
B.
dwarf planet
C.
meteor
D.
planet ( I put A as the awnser)
The function of a cell wall is:
A. A thick rigid structure that surrounds the cell membrane in plants.
B. A thin outer covering found in plants and animal cells. It controls what enters and leaves the cell.
C. The liquid part of the cell where all the organelles are suspended. It also contains nutrients cell waste and water.
D. An organelle found in cells that stores water and nutrients for cells.
Min was writing about changes in the state of matter for a research paper. Which of these changes might she include as examples of sublimation?
Choose the two statements that apply.
A. Clothing is hung outside on a day when the temperature is below the freezing point of water. The clothes dry, even though they freeze first.
B. An ice cube melts on the floor, then it evaporates.
C. Bromine is a reddish brown, liquid element. In a closed container, a reddish brown gas exists above the surface of the bromine.
D. Dry ice changes directly to carbon dioxide gas
Sublimation is the process by which solids are instantly transformed into gases. The forces of attraction between solids are completely defeated when they absorb enough energy. Solids, such as dry ice, undergo sublimation.
What is sublimation?Similar to melting, freezing, and evaporation, sublimation is a form of phase transition, or change in a state of matter. Without ever entering a liquid phase, a substance transforms from a solid to a gas through sublimation. Typical sublimation examples include dry ice, which is solid CO2,additional elements that cannot be sublimated. A solid-solid combination is separated by sublimation when one of the components sublimes (transforms from solid to gaseous state without producing liquid) following heating, leaving the other non- sublimable components behind.Sublimation is the direct transition of a substance from the solid phase to the gas phase without passing through the liquid phase in between. Sublimation is an endothermic phase transition that occurs at temperatures and pressures lower than a chemical's triple point in the phase diagram.To learn more about Sublimation refer to:
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Answer:question 3:(W)
question 4:(c)
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