What colour do you observe ?

Take white antacid powder with water in a test tube add methyl orange indicator to it. Which colour do you observe ?

Which colours do you observe when an iron rod is gradually heated ?

Which colour do you observe, when cupric chloride burns in a non:-luminous flame?

Which colour do you observe, when strontium chloride burns in a non-luminous flame?

What change do you observe in thermometer readings ?

What changes do you observe in the thigh muscle ?

What changes do you observe in the dough ?

What changes do you observe when some material is burning? What do you mean by a chemical change?