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. What claim does this record support?
- 2. Which single test picks out mineral C on its own?
- 3. A new mineral is scratched by a fingernail and leaves a white streak. Which is it most like?
- 4. A and D both leave a white streak. Which test tells them apart?
- A.How heavy it feels
- B.How hot it gets in the sun
- C.The way its surface reflects light
- A.One a coin cannot scratch
- B.One a fingernail can scratch
- C.One that scratches glass
- A.It reacts with the vinegar, which is a property you can test
- B.It is magnetic
- C.It is melting
- A.It is harder than glass
- B.It is softer than glass
- C.It is made of glass
- A.Color cannot be seen
- B.Streak is prettier
- C.A mineral's color can vary, but its streak usually stays the same
- A.Try another test, or consider that they may be the same mineral
- B.Decide they are different
- C.Stop testing
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