Answer:
Temperature.
Explanation:
Temperature is a measure of the average kinetic energy of a system.
The correct answer is 30 seconds
ANSWER

EXPLANATION
Given that;
The two reactants are KBr and CaO
Double replacement reaction is a type of chemical reaction that occur when two reactants exchange cations and anions to yield new products.

Therefore, the resulting products of the given data are K2O + CaBr2
The correct answer is option B
It can take 49 days, I could be wrong. What do you mean in this question?