Question breakdown in Recovering Salts from Lake Brine (Q16–Q20)
| Question | Response Type | Topic | NYSP12SLS Standard | Action |
|---|---|---|---|---|
| Question 16 | 1-credit Multiple Choice (4 options) | Solutions | HS-PS1-10 | Solve in workspace → |
| Question 17 | 1-credit Constructed Response (rubric-scored) | Solutions | HS-PS1-10 | Solve in workspace → |
| Question 18 | 1-credit Multiple Choice (4 options) | Stoichiometry and conservation | HS-PS1-7 | Solve in workspace → |
| Question 19 | 1-credit Constructed Response (rubric-scored) | Stoichiometry and conservation | HS-PS1-7 | Solve in workspace → |
| Question 20 | 1-credit Multiple Choice (4 options) | Bonding and formulas | HS-PS1-2 | Solve in workspace → |
Other clusters in Chemistry Practice Examination · 105
| Questions | Cluster & Topics | Format | Practice |
|---|---|---|---|
| 1–5 | Heat for a SpacecraftA plutonium-238 generator vs a magnesium heater: nuclear vs chemical energy, alpha decay, and Group 2 reactivityNuclear chemistry · Periodic patterns · Engineering design (HS-PS1-8, HS-PS1-1, HS-ETS1-1) | 3 MC, 2 CR | Practice cluster |
| 6–10 | Graphite and Diamond: Two Forms of CarbonPencils, motor brushes, and furnace linings: covalent bonding, conductivity, and forces within and between layersPeriodic patterns · Bonding and formulas · Materials and structure · Intermolecular forces · Polarity and molecular structure (HS-PS1-1, HS-PS1-2, HS-PS2-6, HS-PS1-3, HS-PS3-5) | 3 MC, 2 CR | Practice cluster |
| 11–15 | A Sealed Gas Bag Rising Through WaterA nitrogen lift bag rising from 30 m: Boyle's law, the combined gas law, molar volume at STP, and thermal energyGases · Stoichiometry and conservation · Thermochemistry (HS-PS1-9, HS-PS1-7, HS-PS3-1) | 3 MC, 2 CR | Practice cluster |
| 21–25 | Comparing Two Vinegar SamplesTitrating two vinegars with NaOH: pH and hydronium ions, acids in forward and reverse reactions, and freezing pointAcids and bases · Solutions (HS-PS1-11, HS-PS1-10) | 3 MC, 2 CR | Practice cluster |
| 26–30 | Catalytic Conversion of Carbon Monoxide in ExhaustA catalytic converter model: potential and bond energy, catalyst surface area and rate, stoichiometry, and specific heatThermochemistry · Reaction rates · Stoichiometry and conservation (HS-PS1-4, HS-PS1-5, HS-PS1-7, HS-PS3-1) | 3 MC, 2 CR | Practice cluster |
| 31–35 | Heating Limestone to Make LimeLimestone in a sealed model and crucible: Le Châtelier's principle, CO₂ mass, Group 2 trends, particle size vs rateEquilibrium · Stoichiometry and conservation · Periodic patterns · Engineering design · Reaction rates (HS-PS1-6, HS-PS1-7, HS-PS1-1, HS-ETS1-3, HS-PS1-5) | 3 MC, 2 CR | Practice cluster |
| 36–40 | A Zinc-Air CellZinc-air hearing-aid cells: half-reactions, electron flow and energy conversion, oxidation numbers, ion–water attractionOxidation and reduction · Materials and structure · Polarity and molecular structure (HS-PS1-12, HS-PS2-6, HS-PS3-5) | 3 MC, 2 CR | Practice cluster |
| 41–45 | A Reusable Sodium Acetate Heat PackMelting and re-forming hand-warmer crystals: particle attractions, heat of fusion, specific heat, and percent by massIntermolecular forces · Thermochemistry · Solutions · Polarity and molecular structure (HS-PS1-3, HS-PS3-1, HS-PS1-10, HS-PS3-5) | 3 MC, 2 CR | Practice cluster |
| 46–50 | Lighting a Growth Chamber for Plants in SpaceLED panels for space lettuce: the electromagnetic spectrum, photon energy, photosynthesis, and a claim about green lightElectromagnetic radiation · Photosynthesis · Engineering design (HS-PS4-4, HS-LS1-5, HS-ETS1-2) | 3 MC, 2 CR | Practice cluster |
Frequently asked questions
- How is Recovering Salts from Lake Brine · Chemistry Practice Examination · 105 Chemistry Regents Cluster (Q16–Q20) structured on All Regents?
- Evaporating a sodium chloride model brine: percent by mass, precipitation equations, percent composition, ion charges. Practice the Recovering Salts from Lake Brine phenomenon cluster (Q16–Q20: 3 MC, 2 CR) from Chemistry Practice Examination · 105 (Physical Science: Chemistry). Covers Solutions, Stoichiometry and conservation, Bonding and formulas (HS-PS1-10, HS-PS1-7, HS-PS1-2) with the 2025 Reference Tables and scoring guide. Every question is worth 1 raw credit and pairs with the 2025 Edition Reference Tables, automatic multiple-choice key checking, and step-by-step constructed-response scoring guidance.
- Can I practice one phenomenon cluster at a time or sit the full exam?
- Yes. In the All Regents workspace you can launch any individual 4–6 question cluster in Learn mode (with strategy prompts) or sit the complete examination in Exam mode, then review every answer against the official-style scoring guide.