Answer:
D. A brown gas produced
Explanation:
When a chemical reaction occur, there are several changes that takes place such as change in color, odor change, formation of a gas, and formation of a precipitate etcetera.
In the given chemical reaction, two colorless gas (NO and O2) react together and form brown gas (NO2). So, the change of gas from colorless to brown gas is the evidence that shows chemical reaction occurred.
Hence, the correct option is "D. A brown gas produced".
Answer:
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
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Cell theory is based on microscopes, as we know cells are very small in size and cannot be seen with a naked eye, so if microscopes had not been invented, cell theory would have not been developed as it is today
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It makes an area strongly composed of Oxygen and air vapor.
Answer:
the genotype is responsible for a particular trait or all of the traits
Explanation:
