Can you make tnt with sand and gunpowder?

No, you cannot make TNT (trinitrotoluene) with sand and gunpowder. TNT is a specific chemical compound that requires toluene, a particular type of hydrocarbon, and a nitration process involving nitric and sulfuric acids. Gunpowder, which is a mixture of saltpeter, charcoal, and sulfur, is a different explosive altogether and does not contain the necessary components to synthesize TNT.