Which of the following statements about chemical burns is true?

The statement regarding chemicals causing more damage if they are hot is accurate. Heat can exacerbate the harmful effects of chemical exposure by enhancing the chemical's reactivity and accelerating the rate at which it can damage biological tissues. For instance, when a chemical is at a higher temperature, it may penetrate the skin more deeply and cause more extensive harm than the same chemical at room temperature. Therefore, the combination of chemical aggression and increased temperature makes the situation more dangerous and can significantly impact the severity of the burn.

The other statements lack a basis in reality. The concentration of a chemical indeed matters as higher concentrations can lead to more severe burns. The duration of exposure is also critical since prolonged contact can increase the degree of damage. Lastly, not all chemical burns are identical in severity; the type of chemical, its concentration, temperature, and the duration of exposure all contribute to the overall severity of the burn.