4. Imagine that you are given two metal oxides to study in the lab. You heat eac

Question

4. Imagine that you are given two metal oxides to study in the lab. You heat each oxide in a small test tube and then insert a glowing splint into each. You observe that the splint in tube 1 immediately ignites and burns with a steady flame before it dies, but the splint in tube 2 does not.

a) What happened to the metal oxide in the tube 1 when it was heated?

b) Do both metal oxides decompose when heated? Provide evidence to support your answer.

c) What can you conclude about the stability of the 2 oxides based on these observations?

Explanation / Answer

a) As heating the metal oxide in test tube 1 and inserting a glowing splint, the splint in tube 1 immediately ignites and burns with a steady flame before it dies because the metal oxide in test tube 1 on heating released oxygen which is a supporter of combustion and it ignites the glowing splint.

2) No ,both metal oxide does not decompose on heating as the glowing splint ignites and burns only in test tube 1 .so only the metal oxide in test tube 1 decomposes on heating

3) On the basis of these observations we conclude that metal oxide in test tube 1 is stable and decompose on heating .

metal oxide in test tube 2 is unstable and does not decompose on heating

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