Yes, multiple transactions can be sent on Ethereum, and they will be queued up by the network. Transactions are processed in the order that they are received, and the Ethereum network will prioritize transactions with higher fees. Transactions with lower fees may take longer to be processed, and if the network is congested, it may take a while for all of the transactions to be processed. It is important to note that the Ethereum network is always changing and evolving, so the speed of transaction processing can vary over time.