Слайд 2
![Chemists noticed that the treatment of combustible substances with nitric](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/312805/slide-1.jpg)
Chemists noticed that the treatment of combustible substances with nitric acid
leads to the creation of explosives
Слайд 3
![Josef Wilbrand, a German chemist, studied the properties of toluene in 1863](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/312805/slide-2.jpg)
Josef Wilbrand, a German chemist, studied the properties of toluene in
1863
Слайд 4
![Josef Wilbrand, a German chemist, studied the properties of toluene in 1863](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/312805/slide-3.jpg)
Josef Wilbrand, a German chemist, studied the properties of toluene in
1863