Answer:
Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.
The process of a solid becoming a liquid is called melting. (an older term that you may see sometimes is fusion). The opposite process, a liquid becoming a solid, is called solidification. For any pure substance, the temperature at which melting occurs—known as the melting point—is a characteristic of that substance. It requires energy for a solid to melt into a liquid. Every pure substance has a certain amount of energy it needs to change from a solid to a liquid. This amount is called the enthalpy of fusion (or heat of fusion) of the substance, represented as ΔHfus. Some ΔHfus values are listed in Table 10.2 “Enthalpies of Fusion for Various Substances”; it is assumed that these values are for the melting point of the substance. Note that the unit of ΔHfus is kilojoules per mole, so we need to know the quantity of material to know how much energy is involved. The ΔHfus is always tabulated as a positive number. However, it can be used for both the melting and the solidification processes as long as you keep in mind that melting is always endothermic (so ΔH will be positive), while solidification is always exothermic (so ΔH will be negative).
Table 10.2 Enthalpies of Fusion for Various Substances
Explanation:
If a substance has a density of 19 g/cm3, then what is the mass of 8 cm3 of this substance?
The Periodic Table of Elements is organized by the number of:
a) neutrons
b) electrons
c) protons
d) neutrons and protons
Answer:
c) protons
Explanation:
Answer:
C: PROTONS
Explanation:
PLSSS HELP
The graph shows the distance traveled by a ball over a certain amount of time. According to the graph, between 2 and 4 seconds the ball was-
A. traveling at a constant speed.
B. increasing its speed.
C. changing its direction.
D. remaining at rest.
Which ones are balanced chemical equations? Needs to be done by tonight
Which phrase describes the parts of a solution but NOT the parts of a heterogeneous mixture?
A.) evenly mixed
B.) chemically bonded
C.)always a single type of atom
D.) easily visible with a unaided eye
Answer:
c
Explanation:
someone help me with this question ASAP
Read Solar Basics and use the information to answer the question.
What factors affect the amount of solar energy that reaches the Earth’s surface?
please write a 2-3 sentence answer then you get brainliest if its correct
Answer:
Weather, Time, and Altitude
Explanation:
Is the chemical equation 2Fe+3cl2=>2FeCl3 balanced?
Answer:
No, it is not balanced.
they dump large amounts of rainwater that causes flooding. *
Tsunamis
Hurricanes
Earthquakes
Weathering
what is a water cycle? with explanation please I'm doing research.
Answer:
a cycle of water that circulates between earth's oecans
Explanation:
hope that's helps
Answer:
The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. the cycle of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.
Explanation:
Read the interview with Tom Zambrano.
Interview with Tom Zambrano
What renewable energy sources does Tom Zambrano work on? Check all that apply.
ocean energy
geothermal energy
wind energy
solar energy
i will give brainliest to the best answer
Answer:
The answer is A. Ocean Energy and C. Wind Energy on E D G E N U I T Y
Explanation:
In an ecosystem, renewable energy sources Tom Zambrano works on are ocean energy and wind energy.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
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please help :(
.......
Which statements are true of geothermal energy? Check all that apply.
It is constantly being produced inside the Earth.
Hot water from hot springs or reservoirs is used in heating systems.
It is created by energy from the Sun.
It can be used to generate electricity.
It can be unreliable because it is affected by the weather.
The United States is the world leader in generating power from geothermal energy.
Answer:
1,2,4,6
Explanation:
Answer:
The answer is 1,2,4, and 6 on edge2021
Explanation:
Pls help!!!!!
The exact positions of the electrons in an atom cannot be determined because electrons are always what
1.moving
2.sharing
3.changing
Answer:
moving i think! Hope this helps
Explanation:
Explain why chemical equations have to be balanced.
Answer:
k
Explanation:
They must obey the Law of Conservation of Mass that states that matter cannot be created or destroyed, it is conserved. Atoms are never lost or gained in chemical reactions, they are rearranged. The mass of the reactants must equal the mass of the products.
Answer:
No matter is ever “lost” during a chemical reactions. This is called the law of conservation of mass. But sometimes the way equations are written to make it look liked atoms disappeared so we balanced them so the atoms on both sides of equal.
Explanation:
its correct its not simple response
Group the labels according to the type of waves they describe.
Mechanical waves can transmit through a medium and electromagnetic waves can travel in vaccum and both can transfer energy.
What is mechanical waves?Mechanical waves are those waves in which oscillation of matter takes place in any medium.
Electromagnetic waves are those in which electric field and magnetic field are present in the perpendicular direction to each other and also able to propogate in vaccum medium.
Both waves can transfer energy and travel in the transverse direction.
Hence mechanical waves can transmit through a medium and electromagnetic waves can travel in vaccum.
To know more about mechanical & electromagnetic waves, visit the below link:
https://brainly.com/question/16064726
Lakes, rivers, and streams are created due to what stage of the water cycle?
Answer:
r
Explanation:
r
Pls help :P
Which 2 letters have the most kinetic energy?
The two (2) letters which have the most kinetic energy are: X and Z.
Kinetic energy is an energy that is possessed by a physical object or body due to its motion.
Mathematically, kinetic energy is calculated by using the formula;
[tex]K.E = \frac{1}{2} MV^2[/tex]
Where:
K.E is the kinetic energy.M is the mass of an object.V is the velocity of an object.Basically, the kinetic energy possessed by an object is highly dependent on its mass and velocity.
From the image attached, the car gains more velocity as it travels down the slope and as such has the most kinetic energy at point X and Z.
In conclusion, kinetic energy is greatest at the bottom of a slope while potential energy is least and vice-versa.
Read more: https://brainly.com/question/23153766
