Copper (ii) oxide can be reduced to copper metal by heating it in a stream of hydrogen gas. dry copper (ii) oxide was placed in a tube which had previously been weighed empty . the tube was reweighed containing the copper (ii) oxide and then set up as in the diagram. Hydrogen was passed through the tube for 15 seconds before the escaping gas was lit . the tube was heated for a few minutes. the apparatus was then allowed to cool with hydrogen still passing through. the tube was reweighed. (a, i) where is the most suitable place to clamp the tube?​

3 hours because it is a decent distance.

yes they ca   is ur ansswerrr

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).