Physical and Chemical Changes Practice Test

A sealed syringe contains a sample of nitrogen gas, N2(g). The plunger is pushed inward, decreasing the volume, and the gas pressure increases. No gas enters or leaves the syringe. Which statement best classifies the change that occurs to the nitrogen sample?

A piece of copper metal, Cu(s), is bent back and forth repeatedly until it breaks into two pieces. No heating, burning, or contact with other substances occurs. Which statement best classifies the change?