Answer:
True
Explanation:
Sound waves traveling through air are indeed longitudinal waves with compressions and rarefactions. As sound passes through air (or any fluid medium), the particles of air do not vibrate in a transverse manner.
Answer:
Ranking of given compounds in order of decreasing boiling point : KF > Formaldehyde > Carbon tertrafluoride
Explanation:
- KF is an ionic compound. Hence ionic force is between KF molecules.
- Formaldehyde is a polar compound due to presence of polar carbonyl group. Hence dipole-dipole force is present between formaldehyde molecules.
- Carbon tetrafluoride is a non-polar molecule due to it's symmetrical structure. hence only van der waal force exists between carbon tetrafluoride molecules.
- Order of intermolecular force (decreasing order): Ionic force > dipole-dipole force > van der waal force
- So ranking of given compounds in order of decreasing boiling point : KF > Formaldehyde > Carbon tertrafluoride
There are several information's already given in the question. Based on those information's, the answer can be easily deduced.
Amount of gasoline required by Harry's car to travel 25 miles = 1 gallon
Then
amount of gasoline required
by Harry's car to travel 15000 miles = 15000/25
= 600 gallons
So
Amount of CO2 released by burning 1 gallon of gasoline = 20 pounds
Then
Amount of CO2 released
by burning 600 gallon of gasoline = 600 * 20
= 12000 pounds
From the above deduction, it can be concluded that the amount of CO2 that will be added by Harry's car to the atmosphere is 12000 pounds.
Answer : The correct option is, (3) change states of matter.
Explanation :
Latent heat : It is defined as the heat required to convert the solid into liquid or vapor and a liquid into a vapor without changing the temperature.
There are two types of latent heat.
(1) Latent heat of fusion
(2) Latent heat of vaporization
Latent heat of fusion : It is defined as the amount of heat energy released or absorbed when the solid converted to liquid at atmospheric pressure at its melting point.
Latent heat of vaporization : It is defined as the amount of heat energy released or absorbed when the liquid converted to vapor at atmospheric pressure at its boiling point.
Hence, latent heat is used to change states of matter.
This is a redox reaction.
Cu²⁺ + 2e⁻ = Cu⁰ copper is the oxidizing agent
Fe⁰ - 2e⁻ = Fe²⁺ iron is the reducing agent