---
title: "AP Chemistry FRQ 4 Short Answer Practice"
description: "150 Short Answer Question (FRQ 4)s written in the AP format, each scored part by part."
canonical: "https://fiveable.me/ap-chem/frqs/frq-4"
type: "frq-type-practice"
subject: "AP Chemistry"
---

# AP Chemistry FRQ 4 Short Answer Practice

## What the FRQ 4 Short Answer asks

FRQ 4 is the first of four short-answer questions on the AP Chemistry exam, worth 4 points and focused on one topic. In this set, you identify something from the data, draw on a figure, then work a two-step part C.

- **4 points**: across parts A to C
- **105 min**: for all seven FRQs
- **50%**: of your exam score comes from FRQs

| Part | What it asks | Points |
| --- | --- | --- |
| A: Identify | Name a value, trend, or species from the data, sometimes with a reason | 1 |
| B: Draw | Add a line, arrow, or particle to the figure | 1 |
| C: Propose and calculate | Two steps, often a proposed value and then a calculation | 2 |

## How FRQ 4 Short Answer practice works

1. **Read the full question.** The setup, the figure or data table, and every part, laid out the way the exam shows them.
2. **Write on a 9-minute timer.** A pace that fits all seven questions into the 105-minute section. Pause it or turn it off, and your response saves as you go.
3. **Submit for a score out of 4.** Your response is scored against the scoring guidelines written for that question. Your first score is included.

## All 150 questions

### Unit 1: Atomic Structure and Properties (11)
- [Isotopic composition and mass spectrum analysis](/ap-chem/frq-practice?id=697524e28bf79ce1a59344bf&type=frq-4-short-answer)
- [Isotopic composition and average atomic mass determination](/ap-chem/frq-practice?id=69852434e84ac93142252c74&type=frq-4-short-answer)
- [Atomic structure identification using photoelectron spectroscopy](/ap-chem/frq-practice?id=698528c8e84ac93142252ca8&type=frq-4-short-answer)
- [Photoelectron spectroscopy and valence electron configuration](/ap-chem/frq-practice?id=6985297de84ac93142252cae&type=frq-4-short-answer)
- [Photoelectron spectroscopy and valence electron configuration](/ap-chem/frq-practice?id=69852a39e84ac93142252cb5&type=frq-4-short-answer)
- [Photoelectron spectroscopy and elemental identification](/ap-chem/frq-practice?id=69852b3de84ac93142252cc1&type=frq-4-short-answer)
- [Isotopic composition and abundance determination](/ap-chem/frq-practice?id=69852db0e84ac93142252cd6&type=frq-4-short-answer)
- [Isotope identification and abundance representation](/ap-chem/frq-practice?id=69853309e84ac93142252d0b&type=frq-4-short-answer)
- [Mass spectrum analysis and electron configuration](/ap-chem/frq-practice?id=698533bee84ac93142252d15&type=frq-4-short-answer)
- [Gallium isotopes and mass spectrum analysis](/ap-chem/frq-practice?id=69853508e84ac93142252d25&type=frq-4-short-answer)
- [Elemental identification using photoelectron spectroscopy data](/ap-chem/frq-practice?id=698535e9e84ac93142252d32&type=frq-4-short-answer)

### Unit 2: Compound Structure and Properties (3)
- [Ionic bonding, lattice energy, bond strength comparison](/ap-chem/frq-practice?id=69852680e84ac93142252c8f&type=frq-4-short-answer)
- [Methanoic acid and methanoate ion structure](/ap-chem/frq-practice?id=69852f1ae84ac93142252ce4&type=frq-4-short-answer)
- [Electronic structure determination from photoelectron spectroscopy data](/ap-chem/frq-practice?id=6985345fe84ac93142252d1c&type=frq-4-short-answer)

### Unit 3: Properties of Substances and Mixtures (1)
- [Intermolecular forces between acetone and ethanol](/ap-chem/frq-practice?id=6985294be84ac93142252cab&type=frq-4-short-answer)

### Unit 4: Chemical Reactions (17)
- [Limiting reactant and precipitation products](/ap-chem/frq-practice?id=697523c18bf79ce1a59344b6&type=frq-4-short-answer)
- [Group 2 metal carbonate thermal decomposition](/ap-chem/frq-practice?id=69852677e84ac93142252c8e&type=frq-4-short-answer)
- [Precipitation reaction between lead nitrate and potassium iodide](/ap-chem/frq-practice?id=69852d29e84ac93142252cd1&type=frq-4-short-answer)
- [Precipitation reaction between lead nitrate and potassium iodide](/ap-chem/frq-practice?id=69852de3e84ac93142252cd9&type=frq-4-short-answer)
- [Aluminum oxidation in hydrochloric acid reaction](/ap-chem/frq-practice?id=69852f11e84ac93142252ce3&type=frq-4-short-answer)
- [Precipitation reaction limiting reactant and products](/ap-chem/frq-practice?id=69852fcee84ac93142252ceb&type=frq-4-short-answer)
- [Photoelectron spectroscopy and electron configuration](/ap-chem/frq-practice?id=69853023e84ac93142252ced&type=frq-4-short-answer)
- [Precipitation reaction between silver nitrate and magnesium chloride](/ap-chem/frq-practice?id=698531c9e84ac93142252d00&type=frq-4-short-answer)
- [Acid-base titration equivalence point particle representation](/ap-chem/frq-practice?id=698533d7e84ac93142252d16&type=frq-4-short-answer)
- [Precipitation reaction between lead nitrate and potassium iodide](/ap-chem/frq-practice?id=698536c8e84ac93142252d3a&type=frq-4-short-answer)
- [Redox reaction between aluminum and copper sulfate](/ap-chem/frq-practice?id=698537b5e84ac93142252d46&type=frq-4-short-answer)
- [Precipitation reaction stoichiometry and limiting reactant determination](/ap-chem/frq-practice?id=69853857e84ac93142252d4e&type=frq-4-short-answer)
- [Precipitation reaction between barium chloride and sodium sulfate](/ap-chem/frq-practice?id=698538f5e84ac93142252d58&type=frq-4-short-answer)
- [Precipitation reaction between magnesium chloride and silver nitrate](/ap-chem/frq-practice?id=69853983e84ac93142252d61&type=frq-4-short-answer)
- [Silver nitrate and magnesium chloride precipitation reaction](/ap-chem/frq-practice?id=69853a26e84ac93142252d6a&type=frq-4-short-answer)
- [Magnesium and hydrochloric acid redox reaction](/ap-chem/frq-practice?id=69853ac0e84ac93142252d73&type=frq-4-short-answer)
- [Precipitation reaction: limiting reactant and products](/ap-chem/frq-practice?id=69853b88e84ac93142252d7e&type=frq-4-short-answer)

### Unit 5: Kinetics (15)
- [Activation energy and catalyst effects on reaction pathways](/ap-chem/frq-practice?id=697523ae8bf79ce1a59344b5&type=frq-4-short-answer)
- [Nitrogen dioxide decomposition activation energy and catalysis](/ap-chem/frq-practice?id=69852e02e84ac93142252cda&type=frq-4-short-answer)
- [Hydrogen peroxide decomposition kinetics and activation energy](/ap-chem/frq-practice?id=69852e89e84ac93142252ce0&type=frq-4-short-answer)
- [Hypochlorite decomposition activation energy and catalysis](/ap-chem/frq-practice?id=69852f1de84ac93142252ce5&type=frq-4-short-answer)
- [Hydrogen peroxide decomposition kinetics and temperature effects](/ap-chem/frq-practice?id=698530a2e84ac93142252cf2&type=frq-4-short-answer)
- [Magnesium-hydrochloric acid oxidation-reduction reaction](/ap-chem/frq-practice?id=69853108e84ac93142252cf8&type=frq-4-short-answer)
- [Dinitrogen pentoxide decomposition activation energy](/ap-chem/frq-practice?id=69853124e84ac93142252cfa&type=frq-4-short-answer)
- [Reaction intermediates, activation energy, catalysts](/ap-chem/frq-practice?id=698531c4e84ac93142252cff&type=frq-4-short-answer)
- [Dinitrogen pentoxide decomposition, activation energy, catalysis](/ap-chem/frq-practice?id=6985324ae84ac93142252d05&type=frq-4-short-answer)
- [Nitrogen dioxide decomposition kinetics and activation energy](/ap-chem/frq-practice?id=698534c1e84ac93142252d22&type=frq-4-short-answer)
- [Reaction mechanisms, intermediates, activation energy](/ap-chem/frq-practice?id=6985354ce84ac93142252d2b&type=frq-4-short-answer)
- [Activation energy and catalyzed reaction pathways](/ap-chem/frq-practice?id=698535e0e84ac93142252d31&type=frq-4-short-answer)
- [Activation energy and catalyst effects on reaction pathways](/ap-chem/frq-practice?id=6985382fe84ac93142252d4c&type=frq-4-short-answer)
- [Activation energy and catalytic reaction pathways](/ap-chem/frq-practice?id=698538b5e84ac93142252d54&type=frq-4-short-answer)
- [Gas decomposition reaction kinetics and catalysts](/ap-chem/frq-practice?id=698539a8e84ac93142252d64&type=frq-4-short-answer)

### Unit 6: Thermochemistry (55)
- [Enthalpy change determination using reaction data](/ap-chem/frq-practice?id=697524218bf79ce1a59344b8&type=frq-4-short-answer)
- [Carbon hybridization and intermolecular forces in organic molecules](/ap-chem/frq-practice?id=697525938bf79ce1a59344c6&type=frq-4-short-answer)
- [Intermolecular forces in acetone and 1-propanol](/ap-chem/frq-practice?id=69852545e84ac93142252c82&type=frq-4-short-answer)
- [Molecular polarity and hybridization of dichloroethene isomers](/ap-chem/frq-practice?id=69852777e84ac93142252c96&type=frq-4-short-answer)
- [Hydrogen bonding and molecular geometry in hydrides](/ap-chem/frq-practice?id=698527fee84ac93142252c9d&type=frq-4-short-answer)
- [Propanone and 2-propanol mixture properties](/ap-chem/frq-practice?id=6985287ee84ac93142252ca4&type=frq-4-short-answer)
- [Propanone-propanol mixture: hybridization, hydrogen bonding](/ap-chem/frq-practice?id=69852887e84ac93142252ca5&type=frq-4-short-answer)
- [Intermolecular forces between ethanol and ethanal molecules](/ap-chem/frq-practice?id=698529fbe84ac93142252cb1&type=frq-4-short-answer)
- [Ammonia and methane molecular structure properties](/ap-chem/frq-practice?id=69852a83e84ac93142252cb6&type=frq-4-short-answer)
- [Hydrazine and water intermolecular interactions](/ap-chem/frq-practice?id=69852ab0e84ac93142252cb8&type=frq-4-short-answer)
- [Intermolecular forces between ethanol and dimethyl ether](/ap-chem/frq-practice?id=69852b21e84ac93142252cbc&type=frq-4-short-answer)
- [Isomers, molecular structure, hydrogen bonding](/ap-chem/frq-practice?id=69852be8e84ac93142252cc4&type=frq-4-short-answer)
- [Hybridization and intermolecular forces in organic molecules](/ap-chem/frq-practice?id=69852c72e84ac93142252cca&type=frq-4-short-answer)
- [Propanone and 2-propanol mixture properties](/ap-chem/frq-practice?id=69852c9ce84ac93142252ccc&type=frq-4-short-answer)
- [Hydrogen bonding between acetone and 2-propanol molecules](/ap-chem/frq-practice?id=69852d1fe84ac93142252cd0&type=frq-4-short-answer)
- [Acetone-propanol mixture interactions and bonding](/ap-chem/frq-practice?id=69852d9de84ac93142252cd5&type=frq-4-short-answer)
- [Hydrogen bonding in ethanol and dimethyl ether mixture](/ap-chem/frq-practice?id=69852de1e84ac93142252cd8&type=frq-4-short-answer)
- [Ammonia and phosphine molecular properties, intermolecular forces](/ap-chem/frq-practice?id=69852e0ee84ac93142252cdb&type=frq-4-short-answer)
- [Intermolecular forces in ethanol-ethanal mixtures](/ap-chem/frq-practice?id=69852e67e84ac93142252cde&type=frq-4-short-answer)
- [Molecular structure, hybridization, hydrogen bonding](/ap-chem/frq-practice?id=69852e6be84ac93142252cdf&type=frq-4-short-answer)
- [Hydrogen bonding between ethanol and dimethyl ether](/ap-chem/frq-practice?id=69852f01e84ac93142252ce2&type=frq-4-short-answer)
- [Heating curve phase changes and particle arrangements](/ap-chem/frq-practice?id=69852f25e84ac93142252ce6&type=frq-4-short-answer)
- [Intermolecular interactions in propanone and propanol mixture](/ap-chem/frq-practice?id=69852f79e84ac93142252ce7&type=frq-4-short-answer)
- [Hydrogen bonding in water-acetone mixtures](/ap-chem/frq-practice?id=69852fb0e84ac93142252ce8&type=frq-4-short-answer)
- [Ammonium chloride dissolution and hydration interactions](/ap-chem/frq-practice?id=69853017e84ac93142252cec&type=frq-4-short-answer)
- [Hybridization and hydrogen bonding in organic molecules](/ap-chem/frq-practice?id=69853034e84ac93142252cef&type=frq-4-short-answer)
- [Hydrogen bonding in methylamine-methanol mixture](/ap-chem/frq-practice?id=698530b9e84ac93142252cf4&type=frq-4-short-answer)
- [Molecular structure and hydrogen bonding interactions](/ap-chem/frq-practice?id=698530c1e84ac93142252cf6&type=frq-4-short-answer)
- [Intermolecular forces between ethanol and dimethyl ether](/ap-chem/frq-practice?id=698530d1e84ac93142252cf7&type=frq-4-short-answer)
- [Methanamine molecular structure and hydrogen bonding](/ap-chem/frq-practice?id=69853136e84ac93142252cfb&type=frq-4-short-answer)
- [Intermolecular forces in organic acid-ketone mixtures](/ap-chem/frq-practice?id=6985320be84ac93142252d01&type=frq-4-short-answer)
- [Hydrogen bonding in ethanol-ethanal mixtures](/ap-chem/frq-practice?id=6985328be84ac93142252d09&type=frq-4-short-answer)
- [Hybridization and hydrogen bonding in organic molecules](/ap-chem/frq-practice?id=6985331ee84ac93142252d0e&type=frq-4-short-answer)
- [Hybridization and hydrogen bonding in organic molecules](/ap-chem/frq-practice?id=69853342e84ac93142252d11&type=frq-4-short-answer)
- [Intermolecular forces in ammonia and phosphine molecules](/ap-chem/frq-practice?id=69853382e84ac93142252d12&type=frq-4-short-answer)
- [Lithium chloride dissolution, enthalpy, ion-dipole interactions](/ap-chem/frq-practice?id=698533bce84ac93142252d14&type=frq-4-short-answer)
- [Hydrogen bonding between ethanol and dimethyl ether](/ap-chem/frq-practice?id=698533fbe84ac93142252d19&type=frq-4-short-answer)
- [Intermolecular forces and phase transitions](/ap-chem/frq-practice?id=69853499e84ac93142252d20&type=frq-4-short-answer)
- [Intermolecular forces between ethanal and ethanol molecules](/ap-chem/frq-practice?id=698534d7e84ac93142252d23&type=frq-4-short-answer)
- [Hydrogen bonding in ethanol-ether mixtures](/ap-chem/frq-practice?id=69853541e84ac93142252d2a&type=frq-4-short-answer)
- [Hydrogen bonding between ethanol and dimethyl ether](/ap-chem/frq-practice?id=69853555e84ac93142252d2c&type=frq-4-short-answer)
- [Ammonia and methane intermolecular forces](/ap-chem/frq-practice?id=698535cce84ac93142252d2f&type=frq-4-short-answer)
- [Carbonyl carbon hybridization and hydrogen bonding interactions](/ap-chem/frq-practice?id=698535f0e84ac93142252d34&type=frq-4-short-answer)
- [Intermolecular forces in alcohol condensation and mixing](/ap-chem/frq-practice?id=69853670e84ac93142252d36&type=frq-4-short-answer)
- [Acetone-propanol mixture hydrogen bonding interactions](/ap-chem/frq-practice?id=6985374be84ac93142252d40&type=frq-4-short-answer)
- [Hydrogen bonding in acetic acid and acetone mixture](/ap-chem/frq-practice?id=69853768e84ac93142252d42&type=frq-4-short-answer)
- [Structural isomers, intermolecular forces, hybridization](/ap-chem/frq-practice?id=69853803e84ac93142252d47&type=frq-4-short-answer)
- [Propanone-2-propanol mixture interactions](/ap-chem/frq-practice?id=69853821e84ac93142252d4a&type=frq-4-short-answer)
- [Intermolecular forces in ethanol-methoxymethane mixtures](/ap-chem/frq-practice?id=69853882e84ac93142252d50&type=frq-4-short-answer)
- [Hydrogen bonding in hydrazine-ammonia mixtures](/ap-chem/frq-practice?id=698538b7e84ac93142252d55&type=frq-4-short-answer)
- [Carbonyl carbon hybridization and intermolecular hydrogen bonding](/ap-chem/frq-practice?id=69853980e84ac93142252d60&type=frq-4-short-answer)
- [Isomeric properties, hydrogen bonding, molecular structure](/ap-chem/frq-practice?id=698539eae84ac93142252d67&type=frq-4-short-answer)
- [Benzene heating curve and phase transitions](/ap-chem/frq-practice?id=69853aafe84ac93142252d72&type=frq-4-short-answer)
- [Nitrogen hybridization and hydrogen bonding interactions](/ap-chem/frq-practice?id=69853b66e84ac93142252d7b&type=frq-4-short-answer)
- [Intermolecular forces in acetone-propanol mixture](/ap-chem/frq-practice?id=69853c94e84ac93142252d88&type=frq-4-short-answer)

### Unit 7: Equilibrium (15)
- [Sulfur dioxide-oxygen equilibrium and pressure effects](/ap-chem/frq-practice?id=69853231e84ac93142252d03&type=frq-4-short-answer)
- [Reversible exothermic equilibrium shift with temperature change](/ap-chem/frq-practice?id=698532e0e84ac93142252d0a&type=frq-4-short-answer)
- [Ionic compound solubility and ion-dipole interactions](/ap-chem/frq-practice?id=6985341fe84ac93142252d1a&type=frq-4-short-answer)
- [Equilibrium shift in exothermic gas reactions](/ap-chem/frq-practice?id=6985360be84ac93142252d35&type=frq-4-short-answer)
- [Nitrogen monoxide-bromine equilibrium at varying temperatures](/ap-chem/frq-practice?id=698536e6e84ac93142252d3b&type=frq-4-short-answer)
- [Reversible decomposition equilibrium and temperature effects](/ap-chem/frq-practice?id=69853807e84ac93142252d48&type=frq-4-short-answer)
- [Equilibrium constant expression and particle diagram shifts](/ap-chem/frq-practice?id=6985394fe84ac93142252d5f&type=frq-4-short-answer)
- [Methanol synthesis equilibrium and pressure effects](/ap-chem/frq-practice?id=69853a26e84ac93142252d6b&type=frq-4-short-answer)
- [Nitrogen dioxide-dinitrogen tetroxide equilibrium system](/ap-chem/frq-practice?id=69853af5e84ac93142252d77&type=frq-4-short-answer)
- [Calcium fluoride solubility equilibrium and ion-dipole interactions](/ap-chem/frq-practice?id=69853d1be84ac93142252d8e&type=frq-4-short-answer)
- [Lead(II) iodide solubility equilibrium and hydration](/ap-chem/frq-practice?id=69853dd5e84ac93142252d9a&type=frq-4-short-answer)
- [Reversible gas reactions, equilibrium shifts, temperature effects](/ap-chem/frq-practice?id=69854125e84ac93142252dc5&type=frq-4-short-answer)
- [Nitrogen oxide equilibrium and Le Châtelier's principle](/ap-chem/frq-practice?id=69854311e84ac93142252ddb&type=frq-4-short-answer)
- [Equilibrium shifts in exothermic gas reactions](/ap-chem/frq-practice?id=69854505e84ac93142252de9&type=frq-4-short-answer)
- [Reversible gas-phase reaction equilibrium and pressure changes](/ap-chem/frq-practice?id=698546d8e84ac93142252df9&type=frq-4-short-answer)

### Unit 8: Acids and Bases (18)
- [Oxygen hybridization and hydrogen bonding in molecules](/ap-chem/frq-practice?id=697583c4229374bc48313cbf&type=frq-4-short-answer)
- [Propanoic acid hybridization and hydrogen bonding](/ap-chem/frq-practice?id=6985332ae84ac93142252d0f&type=frq-4-short-answer)
- [Weak acid hydrogen bonding and orbital hybridization](/ap-chem/frq-practice?id=698533ece84ac93142252d18&type=frq-4-short-answer)
- [Hypochlorous acid molecular structure and hydrogen bonding](/ap-chem/frq-practice?id=69853480e84ac93142252d1f&type=frq-4-short-answer)
- [Weak acid properties and hydrogen bonding interactions](/ap-chem/frq-practice?id=6985350ae84ac93142252d26&type=frq-4-short-answer)
- [Methylamine nitrogen hybridization and hydrogen bonding](/ap-chem/frq-practice?id=698535cae84ac93142252d2e&type=frq-4-short-answer)
- [Nitrous acid properties and hydrogen bonding interactions](/ap-chem/frq-practice?id=698536e9e84ac93142252d3c&type=frq-4-short-answer)
- [Weak acid molecular structure and hydrogen bonding](/ap-chem/frq-practice?id=698537abe84ac93142252d45&type=frq-4-short-answer)
- [Propanoic acid hydrogen bonding and hybridization](/ap-chem/frq-practice?id=69853932e84ac93142252d5c&type=frq-4-short-answer)
- [Hydrogen bonding between methylamine and water molecules](/ap-chem/frq-practice?id=69853aa3e84ac93142252d71&type=frq-4-short-answer)
- [Weak acid strength and hydrogen bonding interactions](/ap-chem/frq-practice?id=69853bbfe84ac93142252d80&type=frq-4-short-answer)
- [Acetic acid molecular structure and hydrogen bonding](/ap-chem/frq-practice?id=69853c60e84ac93142252d86&type=frq-4-short-answer)
- [Methylamine weak base hydrogen bonding](/ap-chem/frq-practice?id=69853d00e84ac93142252d8c&type=frq-4-short-answer)
- [Hypochlorous acid, water, and hydrogen bonding](/ap-chem/frq-practice?id=69853dbae84ac93142252d97&type=frq-4-short-answer)
- [Methylamine weak base properties and hydrogen bonding](/ap-chem/frq-practice?id=69853f3ce84ac93142252dab&type=frq-4-short-answer)
- [Propanoic acid hybridization and hydrogen bonding](/ap-chem/frq-practice?id=6985400ce84ac93142252db6&type=frq-4-short-answer)
- [Weak base conjugate acid properties and structure](/ap-chem/frq-practice?id=698540a2e84ac93142252dbe&type=frq-4-short-answer)
- [Weak acid structure, hybridization, hydrogen bonding](/ap-chem/frq-practice?id=69854228e84ac93142252dd1&type=frq-4-short-answer)

### Unit 9: Thermodynamics and Electrochemistry (15)
- [Galvanic cell electron flow and electrode identification](/ap-chem/frq-practice?id=698533dde84ac93142252d17&type=frq-4-short-answer)
- [Galvanic cell electron flow and electrode identification](/ap-chem/frq-practice?id=6985346fe84ac93142252d1d&type=frq-4-short-answer)
- [Redox reaction between copper and silver ions](/ap-chem/frq-practice?id=69853567e84ac93142252d2d&type=frq-4-short-answer)
- [Galvanic cell electrode identification and ion migration](/ap-chem/frq-practice?id=698535e9e84ac93142252d33&type=frq-4-short-answer)
- [Ammonium nitrate dissolution thermodynamics and hydration](/ap-chem/frq-practice?id=698536abe84ac93142252d39&type=frq-4-short-answer)
- [Galvanic cell electrode identification and ion migration](/ap-chem/frq-practice?id=69853743e84ac93142252d3f&type=frq-4-short-answer)
- [Galvanic cell electrode identification and ion migration](/ap-chem/frq-practice?id=69853810e84ac93142252d49&type=frq-4-short-answer)
- [Galvanic cell electron flow and electrode reactions](/ap-chem/frq-practice?id=6985389de84ac93142252d51&type=frq-4-short-answer)
- [Electron flow and electrode identification in galvanic cells](/ap-chem/frq-practice?id=6985391ee84ac93142252d5b&type=frq-4-short-answer)
- [Galvanic cell electron flow and electrode mass changes](/ap-chem/frq-practice?id=69853a4be84ac93142252d6e&type=frq-4-short-answer)
- [Galvanic cell electrode processes and ion migration](/ap-chem/frq-practice?id=69853ae2e84ac93142252d76&type=frq-4-short-answer)
- [Galvanic cell electron flow and electrode identification](/ap-chem/frq-practice?id=69853b66e84ac93142252d7a&type=frq-4-short-answer)
- [Electron flow in galvanic cells with dissimilar metals](/ap-chem/frq-practice?id=69853d46e84ac93142252d93&type=frq-4-short-answer)
- [Galvanic cell electron flow and electrode identification](/ap-chem/frq-practice?id=69853dd1e84ac93142252d98&type=frq-4-short-answer)
- [Galvanic cell electron flow and thermodynamics](/ap-chem/frq-practice?id=69853e8ae84ac93142252da1&type=frq-4-short-answer)

## Sample question

**Isotopic composition and mass spectrum analysis**

A scientist is investigating the properties of a pure sample of Element X. The scientist generates the following diagrams to analyze the element's isotopic composition and particle structure.

Figure 1:
  Type: diagram
  Caption: Figure 1. Mass spectrum of Element X
  URL: https://kcbwzropdukwhmmvdylp.supabase.co/storage/v1/object/public/frq_stimulus/ap-chem/0139b397-2bae-45b7-81f4-641a52d51cae_fig1.jpg
  Placement: before-part
  Part Letter: A

Part A (1 point):
  Prompt: Identify Element X based on the mass spectrum in Figure 1.
  Verb: identify

Figure 2:
  Type: particle_model
  Caption: Figure 2. Particle representation of Element X
  URL: https://kcbwzropdukwhmmvdylp.supabase.co/storage/v1/object/public/frq_stimulus/ap-chem/0139b397-2bae-45b7-81f4-641a52d51cae_fig2.jpg
  Placement: before-part
  Part Letter: B

Part B (1 point):
  Prompt: Figure 2 represents a sample of 10 atoms of Element X. Based on the relative abundances shown in Figure 1, shade the circles in Figure 2 to represent the isotopic composition of the sample.
  Verb: shade

Data Table for Part C:
  Caption: Table 1. Experimental Data for Reaction of X with Sulfur
  Headers: Measurement | Mass (g)
  Mass of empty crucible | 24.00
  Mass of crucible + Element X | 25.27
  Mass of crucible + Compound | 25.59

Part C (2 points):
  Context: The scientist heats the sample of Element X with excess sulfur to form a sulfide compound. The data from the experiment are summarized in Table 1.
  i. Propose the empirical formula of the sulfide compound formed based on the data in Table 1. (1 pt)
    Verb: propose
  ii. Calculate the mass percent of Element X in the sulfide compound. (1 pt)
    Verb: calculate

Image URLs (2):
  - https://kcbwzropdukwhmmvdylp.supabase.co/storage/v1/object/public/frq_stimulus/ap-chem/0139b397-2bae-45b7-81f4-641a52d51cae_fig1.jpg
  - https://kcbwzropdukwhmmvdylp.supabase.co/storage/v1/object/public/frq_stimulus/ap-chem/0139b397-2bae-45b7-81f4-641a52d51cae_fig2.jpg

## Questions

**How many responses can I get scored?**

You can read every question without a plan. Your first scored response is included. A plan unlocks unlimited scoring.

**How do I type formulas, charges, and drawings?**

Use the subscript and superscript buttons for formulas and ion charges. For a drawing, like a Lewis diagram or a mark on a figure, use the drawing tool, or switch the editor to handwrite, draw on paper, and add a photo of your page.

**How much should I write for each part?**

Match the task verb. Identify can take a word or phrase. Explain and justify need the chemical reason, stated in a sentence or two.

**How are short-answer questions different from FRQs 1 to 3?**

Short answers are 4 points and stay on one topic, usually with one point per scored step. FRQs 1 to 3 are 10-point problems with about six parts.

**Can I use a calculator and the equations sheet?**

Yes. The practice screen has a calculator and the AP Chemistry equations sheet with the periodic table, which you also get on exam day.

## Related

- [FRQ 4 Short Answer exam guide](/ap-chem/ap-chemistry-exam/ap-chem-frq-short/study-guide/ap-chem-frq-short)
- [AP Chemistry FRQ 1 Long Answer practice](/ap-chem/frqs/frq-1)
- [AP Chemistry FRQ 2 Long Answer practice](/ap-chem/frqs/frq-2)
- [AP Chemistry FRQ 3 Long Answer practice](/ap-chem/frqs/frq-3)
- [AP Chemistry FRQ 5 Short Answer practice](/ap-chem/frqs/frq-5)
- [AP Chemistry FRQ 6 Short Answer practice](/ap-chem/frqs/frq-6)
- [AP Chemistry FRQ 7 Short Answer practice](/ap-chem/frqs/frq-7)
- [AP Chemistry FRQs](/ap-chem/frqs)
- Any question by id: the `get_frq` tool on the [Fiveable MCP server](/mcp/docs)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)