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.

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Elite Eight Trait Check-Up

1. Respect the Threshold1. Everyone on time?2. Silent for First Five?

2. Be Prepared (2 min)1. Seated2. Have materials3. 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 bonds2H + O ➝

H2OReactants = 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= ReactantsB= Products

Enzymes (Think & Share)

Which type of organic molecule are enzymes considered?

What do enzymes do?

Enzyme Factors (Notes)

Enzymes are affected by…1) Temperature2) pH3) Concentration4) 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: worksheetCatalyst: 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?