Answer:
It will also change from a solid to a liquid at 24°C while the solid gains energy.
Explanation:
Freezing point is the temperature at which a solid and liquid co-exist.
In other words,it is the temperature at which a solid gains energy to overcome the force of attraction between molecules to become liquid or a liquid looses energy to become a solid.
Hence at 24°C:
- The substance changes from solid to liquid by gaining energy
- The substance changes from liquid to solid by loosing energy
Now let us check the options:
The last two options are wrong since conversion is not between solid and gas.It is between solid and liquid.
The first option is wrong as solid gains energy to become liquid.
Hence the correct answer is second option.
Answer:
Explanation:
In a nuclear reaction, the total mass and total atomic number remains the same. It is mentioned that the a alpha particle, 
is being emitted.
For the given fission reaction:
To calculate A:
Total mass on reactant side = total mass on product side
237 = A + 4
A = 233
To calculate Z:
Total atomic number on reactant side = total atomic number on product side
93 = Z + 2
Z = 91
Hence, the isotopic symbol of unknown element is
Answer:
The number of waves that pass a point in 1 second
Explanation:
Answer:
A) Boiling points
B) Melting points
D) Phase (solid, liquid, gas) at room temperature
Explanation:
<u>Intermolecular forces</u><u> are attractive forces between molecules</u>. Generally, intermolecular forces are much weaker than intramolecular forces.
All substances exist in one of three states: gas, liquid, or solid. The major difference between the condensed state and the gaseous state is the distance separating molecules.
The boiling points of substances often reflect the strength of the intermolecular forces operating among the molecules. At the boiling point, <u>enough energy must be supplied to overcome the attractive forces among molecules before they can enter the vapor phase</u>. If it takes more energy to separate molecules of substance A than of substance B because A molecules are held together by stronger intermolecular forces, then the boiling point of A is higher than that of B. The same principle applies also to the melting points of the substances. In general, <u>the melting points of substances increase with the strength of the intermolecular forces</u>.
