We are flying to Amsterdam from Sydney via Guangzhou and Chengdu.

We have a 2 hour 35 minute layover at Guangzhou and a 4 hour 5 minute layover at CD. We will not be leaving either airport.
Would you please let us know
1.Do we a visa when we are passing through China?
2.How do we get from Terminal 2 to Terminal 1?

Thank you