L8 & 9. Enzymes

8 Enzymes

Keywords: catalyst, enzyme, denature, lock and key, collision and biological

ALL: define a catalyst and an enzyme
MOST: describe the properties of an enzyme and how enzyme speed up a reaction
SOME: explain how enzymes speed up chemical reactions
S: What is an catalyst? AfL from last lesson.

I: What is an enzyme? Show video.

Main:
A1: introduced the idea of an enzyme, how then work and what happens if the conditions change.

Practical: which is the best catalyst or enzyme for decomposition of hydrogen peroxide. Remove bung of gas syringe if produces lots of gas and syringe is fully extended to minimise the risk of explosion.
Answer questions- appropriate for ability.

P: Write a message to an alien explaining what you have learnt today.








Conical flask, dilute Hydrogen peroxide, gas syringe, clamp stand.
Catalyst: diced potato, manganese dioxide (manganese (VI) oxide) copper oxide, iron oxide and diced celery.
9 Enzyme investigation

Keywords: rate of reaction catalyst, enzyme, denature, lock and key, collision and biological
ALL: investigate the effect of pH on enzymes
MOST: identify the optimum pH of enzymes from a graph
SOME: explain what happens to enzymes at extreme conditions
S: Lock and Key summary sticking activity

I: demo practical

M:
A1: investigation into the effect of pH on amalyse

A2: Graph drawing form practical

A3: Graph drawing for pH and temperature effect of enzymes. For LA or to save time could provide pupils with pre-plotted graphs and focus on getting information from the graphs

A4: discuss what happen to enzymes under extreme conditions

P: Question master.
Write three key questions which you think people in the class should be able to answer, based on today’s lesson.
When ready, go around and ask people your questions.
(use slide 8 to scaffold lower ability to synthesise better questions)

HW: HA Enzyme& Temp W/s
LA graph drawing