Question

physical and chemical changes - 7.6c

1. payal went with her aunt to watch a fireworks display. she asked her aunt why fireworks react the way they do. her aunt explained that it is due to a chemical change, and that there are indicators to look for. what evidence is there of a chemical change in the fireworks?

select three correct answers.
size of the firework
temperature change
movement of the firework
light production
color change
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Explanation:

Chemical changes are characterized by the formation of new substances and indicators like temperature change, light production, and color change. Size and movement are physical - change related factors. In fireworks, a chemical reaction occurs when they explode. Temperature change happens due to the exothermic nature of the reaction. Light is produced as energy is released in the form of photons during the reaction. Color change is due to different metal salts in the fireworks that emit specific colors when heated.

Answer:

• B. Temperature change
• D. Light production
• E. Color change