Hannah is boiling water in a glass tea kettle. She notices bubbles forming on the bottom of the kettle that rise to the top and wonders what is in the bubbles. She asks her family what they think and this is what they say:
• Dad: They are bubbles of heat
• Calvin: The bubbles are filled with air
• Grandma: The bubbles are an invisible form of water
• Mom: They are empty
• Lucy: The bubbles contain Oxygen and Hydrogen that separated from the water
Which person do you most agree with and why?

Answer in full and complete sentences.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.