ACT Science Practice Question #1814 (Hard (560)) | Test Citadel
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ACT Science Difficulty: Hard (560)

Digital ACT Science Practice Question #1814

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The reddish-brown streak produced by Mineral Y (hematite, Fe2O3) when dragged across an unglazed porcelain streak plate represents: Experiment Context (Physical Identification of Geological Minerals): Geology students performed diagnostic physical property tests on four unknown mineral samples (W, X, Y, Z): Table 20: - Mineral W: Mohs Hardness = 2.5 (scratched by copper penny); Streak = White; Reaction to cold 10% HCl = No reaction - Mineral X: Mohs Hardness = 3.0 (scratches copper penny); Streak = White; Reaction to cold 10% HCl = Vigorous effervescence (bubbling) - Mineral Y: Mohs Hardness = 5.5 (scratches glass plate); Streak = Reddish-brown; Reaction to cold 10% HCl = No reaction - Mineral Z: Mohs Hardness = 7.0 (scratches steel file & quartz); Streak = White/None; Reaction to cold 10% HCl = No reaction
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Streak test reveals the true color of mineral powder.

Masterclass Solution & Distractor Trap Analysis

Streak is the diagnostic powdered color of a mineral on an unglazed ceramic streak plate....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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