Điều chế amoniac hàng loạt yêu cầu nhiệt độ và áp suất cao cũng như sự hiện diện của sắt như chất xúc tác.
Amoni clorua là hợp chất tạo thành từ phản ứng giữa amoniac và hydro clorua.
Sự hòa tan kẽm trong axit clohydric tạo ra khí hydro.
Neptune is the outermost planet of the Solar System, the smallest of the giant planets
Uranus is the 7th planet from the Sun, a gas giant.
The animation presents the main air, water and land routes and transport hubs.
Large construction sites provide archaeologists searching for artefacts with a great deal of work.
The American bison is the largest land animal in North America.
The mosque, built in a distinctive architectural style, is the largest adobe structure in the world.
A mobile, nuclear-capable ballistic missile developed at the end of the Cold War.
This 3D scene explains the correlation between the ratio of similarity and the ratio of volume of geometric solids.
Building 3D shapes into a given cube mesh with the help of several views.
Cossacks, members of independent semi-military communities, played an important role in the history of Ukraine.
The changing bicycle, at first mocked as a toy, is a true mirror of the technical development over the last three centuries.
The highway code contains rules concerning the safety equipment of bicycles.
The invention of the ballpoint pen made writing a lot easier.
Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.
The main protagonists of World War II were tanks.
Hình ảnh này minh họa các khối hình trụ khác nhau cũng như các mặt bên của chúng.
Practise the German alphabet and form words from the letters.