H2 + F2 --> 2HF + energy Is reaction C endothermic or exothermic?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

Which of these is an intensive property of a substance