When solid magnesium burns, it reacts with oxygen in the air to form a powder called magnesium oxide. A chemist performed this reaction in a lab and found that the mass of the magnesium oxide was greater than the mass of the magnesium. What is the reason behind this increase in mass? A. The increase in the mass of the magnesium oxide was due to magnesium atoms in the air. B. The increase in the mass of the magnesium oxide was due to oxygen atoms in the air. C. The increase in the mass of the magnesium oxide happened because magnesium is heavier than oxygen. D. The increase in the mass of the magnesium oxide happened because oxygen is heavier than magnesium.

Oxygen and magnesium come together in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product. This is an exothermic reaction.

The process of cellular respiration requires optimum temperature, enzymes and oxygen supply along with the glucose as reactant which is there in the food solution. These considerations are made to ensure that the solution uses food that is most efficient for cellular respiration.

Explanation:

There are certain enzymes in the system which requires the optimum temperature to carry out their function if the temperature is too low or enzyme concentration is not appropriate the reaction will not proceed or will be very slow. Also, continuous oxygen supply is a must reactant for cellular respiration to occur.

So, it is evident that to produce energy in cellular respiration optimum temperature (37 degrees in human), the appropriate concentration of enzymes and continuous oxygen supply is required along with the glucose in the solution.