Catalysts: Flashcards
(14 cards)
What is a catalyst?
A catalyst is a substance that speeds up a chemical reaction without being used up or chemically changed.
How do catalysts affect chemical reactions?
Catalysts speed up chemical reactions and are specific to particular reactions.
What are enzymes?
Enzymes are biological catalysts that speed up biological reactions in living organisms.
What role do enzymes play in digestion?
Enzymes like lipase break down fats and oils (lipids) into fatty acids and glycerol for storage.
Fill in the blank: Enzymes like lipase have a specific _______.
[shape]
What is lipase?
Lipase is an enzyme (catalyst) used in digestion to break down fats, also known as lipids.
What do lipase enzymes specifically break down?
Lipase enzymes break down fats and oils (lipids).
What are the two other key enzymes used in digestion?
They break down proteins and carbohydrates.
True or False: Catalysts are consumed during a chemical reaction.
False
What happens to the mass of a catalyst after a reaction?
The mass of the catalyst at the end of the reaction will be the same as the mass at the start.
What is the reaction between manganese dioxide and hydrogen peroxide?
Manganese dioxide acts as a catalyst to produce water and oxygen from hydrogen peroxide.
What does the presence of manganese dioxide at the end of a reaction indicate?
It indicates that the catalyst has not been used up or changed.
Fill in the blank: The bubbles produced in the reaction with manganese dioxide and hydrogen peroxide are _______.
[oxygen]
What is the initial mass of manganese dioxide used in the reaction?
0.2 g
