Chemical ecology is the study of chemicals involved in the interactions of living organisms. It focuses on the production of and response to signally molecules and toxins.
Answer:
3.2 Calories
Explanation:
Here we will use a formula
Heat added in calories = Mass of glass x Increase in temperature x specific heat of glass
As we know that, specific heat is the amount of energy required to raise the temperature of one gram of any substance by 1°C. It has a constant value for every substance and for glass the specific heat is .16 calories/gm
Incorporating the values of mass (m), temperature(T) and specific heat (c) in formula.
calories (small calories) = l.0 g x 20 degrees x .16 calories/gm/°C
= 3.2 calories
Hope it helps:)
Kinetic energy is the energy possessed by a particle or a body when in motion.
It is calculated by 1/2 mv², where m is the mass and v is the velocity.
But from the Grahams law of diffusion
V(he)/V(o2) = √(M(o2)/M(he)
= √(32/4)
= 2.83
This means that Helium diffuses at a rate of 2.83 times faster than oxygen.
Since the conditions are the same then the two gases will have equal kinetic energy,
Hence; ( He= 4g/mol, O2 = 32g/mol
5610 = 0.5 × 4/1000 ×v²
v² = 2805000
v = 1674.8 m/s for He
Therefore, since He diffuses at a rate of 2.83 times faster than oxygen
Then, the velocity of Oxygen will be;
1674.8/2.83
= 591.8 m/s
Thus, the velocity of oxygen molecules is 591.8 m/s
The answer is a) gas, because a solid has no movement involved and gas has movement. It cannot be a liquid because the molecules would be seperated.
