Reinforced Concrete Made of Wood: teacher key

How Paper Is Made, grade 10 edition, written for 10th grade. Hydrogen bonds, a recycling chemical loop, and the engineering that turns pulp into a sheet.

Read the book. Print this page for the key.

Questions and answers

1. What role does lignin play in the reinforced concrete comparison?
   • It is like the steel bars
   • It is like the hardened cement (answer)
   • It is like the water
2. What does the recovery boiler turn sodium sulfate back into?
   • Sodium sulfide (answer)
   • Lime
   • Brown stock
3. Where had papermaking spread to by about 1150?
   • Mexico
   • Spain (answer)
   • Brazil
4. Why was the Fourdrinier wire named a wire?
   • It was once woven from bronze (answer)
   • It carried electricity
   • It was thin as a hair
5. What is washi?
   • Tough Japanese handmade paper (answer)
   • A chemical
   • A machine part

Words

• lignin: natural wood glue
• cellulose: plant fiber stuff
• kraft: strength
• washi: Japanese paper