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Language Standards > Determining Meanings of Words and Phrases (CCSS.L.8.4) Practice Test

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In our lab, we compared two beakers of hydrogen peroxide. The first sat untouched; the second received a small pinch of manganese dioxide, a black powder. Immediately, bubbles streamed up as oxygen formed more rapidly. The powder was called a catalyst because it made the reaction proceed faster, yet it remained unchanged at the end. We even weighed it afterward and found no loss of mass. By speeding the process without being used up itself, the substance allowed us to finish the demonstration in minutes instead of waiting much longer.

As used in the passage, what does catalyst most nearly mean?

When our class studied early explorers, we read about a team that planned to circumnavigate a remote island in small canoes. Rather than cutting across its interior, they intended to follow the shoreline, tracing its bays and cliffs and eventually arriving back at their starting camp. The map they carried showed safe inlets at regular intervals, so the route would take them around the entire perimeter. The captain reminded the crew that the goal was not speed, but to travel completely around the land to chart hazards and currents.

Language Standards > Determining Meanings of Words and Phrases (CCSS.L.8.4) Practice Test

As used in the passage, what does catalyst most nearly mean?

As used in the passage, what does circumnavigate most nearly mean?

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