Scratch, Shine and Streak
5-PS1-3
Read the record, then answer the questions.
Four Unlabeled Minerals
Test results for four unlabeled minerals, each tested the same five ways. WHAT EACH MINERAL DID Mineral A: scratched by a fingernail, pearly shine, white streak, not pulled by a magnet, no fizz Mineral B: scratches glass, glassy shine, no streak, not pulled by a magnet, no fizz Mineral C: not scratched by a coin, metallic shine, black streak, pulled by a magnet, no fizz Mineral D: scratched by a coin but not a fingernail, glassy shine, white streak, not pulled by a magnet, fizzes with vinegar Tests: scratch, shine, streak on a rough white tile, magnet, a drop of vinegar.
- 1. Which mineral was pulled by a magnet?
- 2. Which single test picks out mineral C on its own?
- 3. What claim does this record support?
- 4. A and D both leave a white streak. Which test tells them apart?
- A.Streaks are always black
- B.Fool's gold is real gold
- C.A streak test can tell apart minerals that look alike
- A.Color cannot be seen
- B.Streak is prettier
- C.A mineral's color can vary, but its streak usually stays the same
- A.Decide they are different
- B.Try another test, or consider that they may be the same mineral
- C.Stop testing
- A.How shiny the mineral is
- B.How heavy the mineral is
- C.The color of the powder a mineral leaves when rubbed on a rough white tile
- A.How heavy it feels
- B.The way its surface reflects light
- C.How hot it gets in the sun
- A.It is melting
- B.It is magnetic
- C.It reacts with the vinegar, which is a property you can test
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