Molecules are pure substances. This is because a molecule has a set ratio of elements in order to make that compound have the same properties.
For example:
Water is H₂O. Always. There is no alternate water formula.
Sand however, is a mixture, who knows exactly what is in sand, and how much of it is in there.
Answer:
Explanation:
Since temperature is to be maintained ; constant temperature and a such, the process is ISOTHERMAL
- to calculate mass of then gas = P1V/RT1
- m1 = 10 x 10^5 x 0.3 / 287 x 330
- similarly for m2 = P2V/RT2
- hence required mass = m1 - m2
b) Considering a well-insulated cylinder ;
Cp = 29J/molK
Temperature T2 = T1 [ P1/P2]^(1-γ)/γ
where γ = 1.4
plugging the values into the equation ; T2 = 171k
hence mass of the gas m1 = P1V/RT1
= 10 x 10^5 x 0.3/287 x 171
= 6.11kg
mass of m2 = P2V/RT2
= 10^5 x 0.3/287 x 171
= 0.611kg
hence required mass = m1 - m2
= 5.50kg
Answer: Lithium is used in cell phone batteries. I don't think it is used in the body as far as I know. Maybe in surgical procedures.
Earth has 4 systems/ spheres which are known as Lithosphere(land), Biosphere(living things), Hydrosphere(water) and Atmosphere(air).
Transpiration is the process that interact with the Hydrosphere and Respiration is the process that interacts with the Atmosphere.
Transpiration is the process happening in plants which absorb and distribute water through their roots and release water in the form of vapors through their leaves. As this process involves Water, therefore this process interacts with the Hydrosphere.
Respiration is the process in which plants convert carbon dioxide to oxygen as a part of photosynthesis which was then inhaled by the animals. As this process involves Air, therefore this process interacts with the Atmosphere.
It's simply, e.g. I'm from Poland, imagine that you give me strong acid (HF, dangerous corrosive substance), so how can I recognize that this substance is dangerous? Safety symbols on all hazardous products are <span>requirement in chemistry.</span>
