Are fire works a phiscal reaction

When you look at the fireworks, you see dazzling sparkles of red, white and blue trickle down in all directions. The explosion of fireworks is an example of chemical change. During a chemical change, substances are changed into different substances. Another words, the composition of the substance changes.

Explanation:

they are chemical because of all of the material in the firework itself

Explanation:

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock