Chemical Reactions Answer Key
Investigate the signs of chemical reactions and explore factors that affect reaction rates.
Prior Knowledge Questions
Q1.What is a chemical reaction?
A chemical reaction is a process where substances (reactants) are transformed into new substances (products) with different properties.
Q2.What are four signs that a chemical reaction has occurred?
Color change, gas production (bubbles), temperature change, and formation of a precipitate (solid).
Q3.What is the Law of Conservation of Mass?
Matter cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.
Activity A – Reaction Rates
Q1.How does temperature affect reaction rate?
Increasing temperature speeds up reaction rate because particles move faster and collide more frequently with more energy.
Q2.What is a catalyst?
A catalyst is a substance that speeds up a chemical reaction without being consumed in the process.
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