When mercury thiocyanate is set on fire, it undergoes a chemical reaction known as the "Pharaoh's serpent" due to the growth of a large mass that resembles a coiling snake. This is a demonstration of a chemical change.

1. Formation of a gas: Yes, gases are produced during the combustion process.

2. Change in colour: Yes, the original white substance turns into a dark mass, indicating a change in colour.

3. Formation of a new solid: Yes, the growth of the "serpent" is actually the formation of a new solid as a result of the chemical reaction.

So, all three signs of a chemical change are observed when mercury thiocyanate is set on fire.

Question

When mercury thiocyanate is set on fire, it undergoes a chemical reaction known as the "Pharaoh's serpent" due to the growth of a large mass that resembles a coiling snake. This is a demonstration of a chemical change.

1. Formation of a gas: Yes, gases are produced during the combustion process.

2. Change in colour: Yes, the original white substance turns into a dark mass, indicating a change in colour.

3. Formation of a new solid: Yes, the growth of the "serpent" is actually the formation of a new solid as a result of the chemical reaction.

So, all three signs of a chemical change are observed when mercury thiocyanate is set on fire.

Knowee AI · Accepted Answer

When mercury thiocyanate is set on fire, it undergoes a chemical reaction known as the "Pharaoh's serpent" due to the growth of a large mass that resembles a coiling snake. This is a demonstration of a chemical change.

1. Formation of a gas: Yes, gases are produced during the combustion process.

2. Change in colour: Yes, the original white substance turns into a dark mass, indicating a change in colour.

3. Formation of a new solid: Yes, the growth of the "serpent" is actually the formation of a new solid as a result of the chemical reaction.

So, all three signs of a chemical change are observed when mercury thiocyanate is set on fire.

Which of the following signs of chemical change were observed when mercury thiocyanate was set on fire?Formation of a gasChange in colourFormation of a new solidI'm not sure

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