Chemistry 0620 · IGCSE · Diffusion

Diffusion — practice question

Carbon and silicon are elements in Group IV of the Periodic Table. Carbon dioxide in the air enters green plants and is changed into carbohydrates.
(a(i))[1]

Name the process that allows carbon dioxide molecules to travel from the air into green plants.

(a(ii))[1]

Explain why silicon(IV) oxide is unable to travel through the air in the same way as carbon dioxide.

(a(iii))[5]

Name the process in which carbon dioxide is changed into glucose, C$_6$H$_{12}$O$_6$, in green plants. Give two conditions needed for this process to happen. Write a chemical equation for the reaction. name of process ................................................... condition 1 ................................................... condition 2 ................................................... chemical equation ...................................................

(b(i))[1]

What type of polymerisation takes place when glucose is changed into starch?

(b(ii))[1]

What type of reaction takes place when starch is changed into glucose?

(b(iii))[1]

Complete the diagram below so that it represents the structure of the glucose monomer.

Worked solution & mark scheme

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