Transcript File - Ms. Nay`s Biology Class Website

Materials: worksheet
**Turn in McMush lab to front tray
Catalyst: Identify all examples of macromolecules in the passage below. Write
down the example and what type of macromolecule it is.
A Big Butt Is A Healthy Butt: Women With Big Butts Are Smarter And
Healthier
Scientists from the University of Oxford have discovered that women with
larger than average butts are not only increasingly intelligent but also very resistant
to chronic illnesses.
According to ABC News, the results found that women with bigger
backsides tend to have lower levels of cholesterol and are more likely to produce
hormones to metabolize sugar. Therefore, women with big butts are less likely to
have diabetes or heart problems.
And having a big butt requires an excess of Omega 3 fats, which have been
proven to catalyze brain development. The researchers also found that the children
born to women with wider hips are intellectually superior to the children of slimmer,
less curvy mothers.
Elite Eight Trait Check-Up
1. Respect the Threshold
1. Everyone on time?
2. Silent for First Five?
2. Be Prepared (2 min)
1. Seated
2. Have materials
3. Working on catalyst
Class Motto
If there is a problem,
We look for a solution.
If there is a better way,
We find it.
If we need help,
We ask.
If a teammate needs help,
We give.
Announcements
• Quick tutorial today 3:15-3:45
• Cram Jam this Saturday 9-noon. EC will be
given.
Standard
• SB1b. Explain how enzymes function as
catalysts.
Objectives
• I can describe how molecules interact in a chemical
reaction.
• I can describe how a catalyst interacts with reactants in
a chemical reaction.
• I can use controlled experiments to measure the effect
of four variables on a chemical reaction: temperature,
concentration, surface area, and catalysts.
• I can explain why increasing temperature, reactant
concentrations, surface area, and the numbers of
catalyst molecules raise the rates of chemical reactions.
Notes 2.3: Enzymes and Catalysts
Chemical Reactions
• Change one substance to another by breaking
and forming bonds
2H + O ➝ H2O
Reactants = Substrates:
come BEFORE the arrow
Products: come
AFTER the arrow
Catalysts
• Catalysts speed up reactions by lowering the
activation energy
• Basically they make it easier to get to the
intermediate, so the reaction happens faster
• Biological catalysts are called enzymes
EA = Activation Energy= Energy to get
to the intermediate
Determines the speed of the reaction
EA is lowered by the enzyme
Analogy (Notes)
• Which would you prefer? Bigger or shorter hill?
Hill Height=
Activation Energy
Required
A= Reactants
B= Products
Enzymes (Think & Share)
Which type of organic molecule are
enzymes considered?
What do enzymes do?
Enzyme Factors (Notes)
Enzymes are affected by…
1) Temperature
2) pH
3) Concentration
4) Surface area
HIGH Temperature and
LOW pH (ACIDS)
DENATURE enzymes
Factors which affect the speed of a
reaction
• Surface area – the measure of the amount of
exposed area an object has
• Concentration – a measure of how much of a
given substance is mixed with another
substance
• Half life - the time required for one half of the
reactant molecules to react.
Materials: worksheet
Catalyst: answer these 2 questions on
your gizmo worksheet
**Turn in McMush Lab
• Suppose you added a spoonful of sugar to hot
water and another to ice-cold water. Which
type of water will cause the sugar to dissolve
more quickly? ___________________
• Suppose you held a lighted match to a solid
hunk of wood and another match to a pile of
wood shavings. Which form of wood will catch
fire more easily? ______________________
Materials: none
• Get out Gizmo Worksheet
• Find a partner at your table
• Log on to Explorelearning.com
Panther Pass
Guided Practice
• A chemical reaction causes the chemical
compositions of substances to change.
Reactants are substances that enter into a
reaction, and products are substances
produced by the reaction. The Collision Theory
Gizmo™ allows you to experiment with several
factors that affect the rate at which reactants
are transformed into products in a chemical
reaction.
Guided Practice
• You will need blue, green, and orange markers or
colored pencils for the first part of this activity.
•
• Look at the key at the bottom of the SIMULATION
pane. In the space below, draw the two reactants
and two products of this chemical reaction.
Reactants:
Products:
Guided Practice
• Click Play ( ). What do you see? __________
_______________________________________
_______________________________________
_______________________________________
Independent Practice
Activity A
• Reset the Gizmo, then complete Activity A.
• Write your responses on the Student Exploration
Sheet.
Activity C
• Reset the Gizmo, then complete Activity C.
• Write your responses on the Student Exploration
Sheet.
Panther Pass
1. What is the role of a catalyst?
2. What organic molecule is an enzyme made
of?
3. Why does increasing temperature cause the
reaction to proceed more quickly?
4. What are 2 ways that enzymes are
denatured?