Answer:
Crystallization of tetrafloroethane C₂F₄ is easier than styrene C₈H₈ .
Explanation:
Crystallization -
crystallization is a process in which atoms are restructured in the form of crystals , some of the ways by which crystals form are melting , precipitating from a solution.
we need to consider the melting point of the given compounds ,
the melting point of styrene C₈H₈ is -30 °C
whereas the melting point of tetrafloroethane C₂F₄ is -140 °C ( 130.7 K ) since the melting point of C₂F₄ is less than C₈H₈ so it is easy to melt C₂F₄.
Hence it is easier to crystallize C₂F₄ .
Answer:
m = 0.531 molal
Explanation:
∴ m fructose = 3.35 g
∴ V water = 35.0 mL
∴ ρ H2O = 1 g/mL
- molality = moles solute / Kg solvent
∴ Mw fructose = 180.16 g/mol
⇒ moles fructose = 3.35 g * ( mol / 180.16 g) = 0.0186 mol fructose
⇒ m H2O = 35.0 mL * ( 1 g/mL ) * ( Kg/1000g) = 0.035 Kg H2O
⇒ molality (m) = 0.0186 mol fructose / 0.035 Kg H2O
⇒ m = 0.531 molal
Chemical reactions can be detected by some of these changes:
1. change of color
2. formation of a solid
3. formation of gas
4. exchange of heat with surroundings
Humans don't generally have a symbiotic relationship with earth. We take many of earth's natural resources and tear down the landscape of earth without putting any of it back. Although humans are receiving positively from earth, we aren't giving back, which is what would have to happen in order to obtain a symbiotic relationship. It is more a parasitic relationship.
