Question

1. which unit operation prevents equipment from overheating?

a) reactor
b) separator
c) heat exchanger
d) pump

1. why are pfds useful for technicians?

a) they provide big - picture views only
b) they show detailed flow and equipment
c) they guarantee 100% yield
d) they replace mass balances

1. which best summarizes passage 2?

a) unit operations, pfds, and mass balance importance
b) why feedstock becomes paper
c) how off - spec products harm profits
d) why throughput is always high
writing response (wr2): using evidence from the passage, explain why mass balance is important. what risks might occur if missing mass is ignored?

Explanation:

1. A heat - exchanger transfers heat between fluids to control temperature and prevent overheating. Reactors are for chemical reactions, separators for separating components, and pumps for moving fluids.
2. PFDs (Process Flow Diagrams) show detailed flow and equipment in a process, which is useful for technicians. They don't just provide big - picture views, can't guarantee 100% yield, and don't replace mass balances.
3. Without Passage 2, assuming the context from previous questions, unit operations, PFDs, and mass balance importance seem to be the main topics.

For the writing response, mass balance is important as it helps in understanding input - output relationships in a process, ensuring efficiency and proper operation. Ignoring missing mass can lead to inaccurate process control, product quality issues, and potential safety hazards.

Answer:

1. c) Heat exchanger
2. b) They show detailed flow and equipment
3. a) Unit operations, PFDs, and mass balance importance