Warm Up : 3 Mins
Independently and silently, answer the following in your
science notebook
Warm Up: Continued
Chemical Reactions
Agenda
01
02
Warm-Up
LT & SC
04
Mini Lesson
05
Independent
work/Exit
Ticket
Learning Target
▪ Explain the role enzymes play in living things
and what affects their function.
▪ Explain why buffers are important to the
survival of an organism.
Buffers help
maintain
homeostasis in
organisms.
Acids, Bases, and pH
Low pH = acidic; higher concentration of H+
High pH = basic; lower concentration of H+
Read:
We will read “Buffers”, and answer the
following question:
What is a buffer? Why is it useful to
cells?
Read:
We will read “Buffers”, and answer the
following question:
What is a buffer? Why is it useful to
cells?
Ans: A buffer is a weak acid or weak
base that can neutralize strong acids
and strong bases. A buffer helps
stabilize the pH of a solution. Buffers
are useful because cells tend to
require a very narrow range of pH
values to perform life functions.
Chemical Reactions
A chemical reaction changes one set of chemicals
into another.
The elements or compounds that engage in a
chemical reaction are known as reactants.
The elements or compounds produced by a
chemical reaction are known as products.
Energy in Reactions
Chemical reactions that release energy often occur
spontaneously.
Chemical reactions that absorb energy require a source of
energy.
Which reaction can occur spontaneously?
Activation Energy
Activation Energy
Enzymes
Enzymes lower activation energy and speed up chemical
reactions in cells.
The Enzyme-Substrate Complex
Substrates
Catalyst: A
substance that
speeds up a
chemical reaction
without being
consumed by the
reaction.
Enzymes: Biological
catalysts, mostly
proteins.
Product
Substrates: End
products.
Carbonic Acid:
H2CO3
Independent
Work
Read the section, “Enzymes”, and
answer the following:
Explain the role of enzymes and
how the affect the chemical
reactions of living things.
Independent
Work
Read the section, “Enzymes”, and
answer the following:
Explain the role of enzymes and
how the affect the chemical
reactions of living things.
Ans: Enzymes act to speed up a
chemical reaction by lowering the
activation energy. Without enzymes,
the chemical reactions of living
things would occur too slowly to be
effective, and life could not function.
Exit TIcket: 2 Mins
Silently and independently answer the following in your
science notebook: