Answer:
heat flow
Explanation:
heat flow moves to a higher temperature to a lower temperature
Answer:
A compound
Explanation:
That's the definition — a compound is a substance that has definite properties and constant composition.
The mass of CH₄ that is consumed is 10.598 g.
<h3>What is enthalpy?</h3>
The enthalpy of a system is defined as the sum of the internal energy of a system and the energy that is produced due to its pressure and volume.
It is given by
H = U+PV
The following reaction takes place during the combustion of CH₄
![CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)](https://tex.z-dn.net/?f=CH_4%28g%29%2B2O_2%28g%29%5Crightarrow%20CO_2%28g%29%2B2H_2O%28g%29)
Energy evolved during the combustion, E = 587.9 kJ
Enthalpy of combustion of methane, ∆H = 890.3 kJ
![No of moles of CH_4 =\frac{energy evolved}{enthalpy of combustion}](https://tex.z-dn.net/?f=No%20of%20moles%20of%20CH_4%20%3D%5Cfrac%7Benergy%20evolved%7D%7Benthalpy%20of%20combustion%7D)
= 587.9 /890
Mass of CH₄ that is consumed = no of moles × molar mass of CH₄
= 587.9 /890 × 16
= 10.598 g
The mass of CH₄ which is consumed is 10.598 g
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Answer:
1. Sound is a energy (mechanical)produced by vibrating objects and sound energy is movement of energy through particles.
2.Space occupied by the substance
3.<u>Propagation</u> of <u>Sound Wave</u> and <u>particles of the medium</u>
4.High-Frequency(Ultrasonic wave)
Explanation:
1.Sound is the form of energy which causes sensation of hearing to our ear.It is produce by vibrating objects. When the objects vibrate(to and fro motion) ,they pushes the particles of medium creating the region of high density called compression .When the particles moves backward ,they creates a region of low density called Rarefaction.This pattern repeats indefinitely.
2.Volume is the quantity of three dimensional space occupied by substances like solid,liquid and gases. The SI unit of volume is
![m^{3}](https://tex.z-dn.net/?f=%3Cstrong%3Em%5E%7B3%7D%3C%2Fstrong%3E)
In metric system unit of volume is liter
3. Longitudinal Waves: Waves in which displacement of the medium particles are parallel(in the same direction) to the propagation of wave.
Sound wave is longitudinal wave.Hence its particles moves in the same direction as the wave (energy)travel.
4.Frequency: The number of times sound wave passes a given point in one second.Its SI unit is Hertz(Hz).
Frequency of vibration decides the Pitch of the sound waves producing them.
A sound wave of High Pitch means it is oscillating rapidly(at high speed).These are also called Ultrasonic waves. These have frequency more than 20000 Hz. Human being can't hear ultrasonic waves.