The set up below was used to investigate the reaction between dry hydrogen gas and copper (II) oxide. (a) Name substance A (b) State the observation made in the combustion tube. (c) Explain the observation made in (b) above.

Hii ndiyo swali lako la mwisho la bure leo!

a) Jina la dutu A:
Dutu A inatumika kukausha gesi ya hidrojeni kabla haijaitikia.
Jina la dutu A ni: $\boxed{\text{Anhydrous calcium chloride}}$ (Kloridi ya kalsiamu isiyo na maji).

b) Eleza uchunguzi uliofanywa kwenye bomba la mwako:
Copper (II) oxide ni nyeusi. Baada ya mmenyuko, rangi itabadilika.
Uchunguzi ni: $\boxed{\text{Rangi nyeusi ya copper (II) oxide inabadilika na kuwa kahawia-nyekundu.}}$

c) Eleza uchunguzi uliofanywa katika (b) hapo juu:
Hidrojeni ni wakala wa kupunguza (reducing agent) na hupunguza copper (II) oxide kuwa shaba (copper) ya metali.
Maelezo: $\boxed{\text{Gesi ya hidrojeni hupunguza copper (II) oxide nyeusi kuwa shaba (copper) ya metali yenye rangi ya kahawia-nyekundu, huku ikitengeneza maji.}}$
Mlinganyo wa mmenyuko ni:

$$H_{2(g)} + CuO_{(s)} \xrightarrow{\text{heat}} Cu_{(s)} + H_2O_{(g)}$$