Doctor Sam found a substance in a cave. He conducted many tests on it. after heating it, purple vapours came out. What was this substance?

Somebody took a rock and put in a acid. Bubbles of hydrogen came out. What was this rock made of?

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Ammonium chloride is put under a funnel and is x. Soon everything becomes foggy with a y gas. after removing, a a smell occurs this is gas z and the process is b. What is x?

Ammonium chloride is put under a funnel and is x. Soon everything becomes foggy with a y gas. after removing, a a smell occurs this is gas z and the process is b. What is y?

Ammonium chloride is put under a funnel and is x. Soon everything becomes foggy with a y gas. after removing, a a smell occurs this is gas z and the process is b. What is a?

Ammonium chloride is put under a funnel and is x. Soon everything becomes foggy with a y gas. after removing, a a smell occurs this is gas z and the process is b. What is b?

When copper sulphate is heated, it turns x in colour. What is x?

When copper sulphate is heated, it turns changes colour. To bring its blue colour back x is put. What is x?

Is milk going sour a physical or chemical change?

Wood that is burning in a brush pile has heat, and produces ashes.

Burning coal