Answer:
is the rate of formation of nitrogen dioxide.
Explanation:
Rate law says that rate of a reaction is directly proportional to the concentration of the reactants each raised to a stoichiometric coefficient determined experimentally called as order.
Given: Order with respect to 
= 1
Order with respect to 
= 2
Thus rate law is:
![R=k[NO]^2[O_2]^1](https://tex.z-dn.net/?f=R%3Dk%5BNO%5D%5E2%5BO_2%5D%5E1)
k= rate constant
is the rate of formation of nitrogen dioxide.
Weight is affected by gravitational force
Answer : The correct option is, (A) the copper must have combined with another substance.
Explanation :
According to the question, when a sample of copper powder is heated in an evaporating dish by using Bunsen burner then the mass of the powder in the evaporating dish increases after heating that means the copper powder will be combined with the another substance.
If the mass of powder in the evaporating dish is decreases after the heating then the copper powder must have lost some matter.
The given option C and D are wrong statements because the hot copper is less dense than the cold copper and as we know that the density is directly proportional to the mass of a substance that means the hot copper weighs less than cold copper.
Hence, the correct option is, (A) the copper must have combined with another substance.
It would be the skeletal system. This systems primary purpose it to give body its shape, support, protection, and makes new red blood cells from the bone marrow. Located deep inside bones.
For cells to work and survive,they all carry specific tasks which leaves impact on the cell, in short terms all the cells are important and contribute for the cell to survive.
