Question

An unbroken glow stick has a mass of 80 g. When you bend it, a glass vial inside the glow stick breaks open and releases a chemical that mixes with the surrounding liquid.Which sign(s) of a chemical change do you to see as a result of the reaction?What is the mass of the glow stick once the reaction is over? Explain your answer.

Answer 1

When a glow stick is bent, a chemical reaction occurs and signs of a chemical change include temperature changes, light production, color changes, and bubble formation. The mass of the glow stick remains the same after the reaction.

Step-by-step explanation:

When a glow stick is bent and the glass vial inside breaks open, a chemical reaction occurs. This is seen through several signs of a chemical change:

1. Temperature changes: The reaction may result in either an increase or decrease in temperature.
2. Light given off: The glow stick produces light as a result of the chemical reaction.
3. Unexpected color changes: The chemicals inside the glow stick combine to produce a different color.
4. Bubbles are formed: As the chemicals mix, bubbles may be produced.

Once the reaction is over, the mass of the glow stick remains the same. This is because mass is conserved in chemical reactions, meaning the total mass before the reaction is equal to the total mass after the reaction.