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Key Facts: Engineer Chemical Analysis Exam

80 items

Official written paper length (4 subjects × 20 items)

Q-Net Engineer-grade grading method; Enforcement Rule [별표 8]; Q-Net 화학분석기사 page

120 minutes

Written examination duration (30 minutes per subject)

Q-Net 필기시험 접수안내 (기사·산업기사 과목별 30분)

40 / 60

Written per-subject floor (과락) and overall passing average

Q-Net 검정기준 및 방법 (기사)

KRW 19,400

Written registration fee on Q-Net 화학분석기사 page

Q-Net crf005 jmCd=1563, checked 2026-09-20

KRW 62,900

Practical registration fee on Q-Net 화학분석기사 page

Q-Net crf005 jmCd=1563, checked 2026-09-20

2 years

Written-pass exemption period from pass date

National Technical Qualifications Act Enforcement Decree Article 21

Composite practical

Practical exam format (필답형 2 hours + 작업형 ~3.5 hours)

Q-Net 화학분석기사 practical specifications

화학분석기사 is HRD Korea's Engineer-grade qualification under 산업통상부 (MOTIR) for chemical analysts and laboratory scientists. The written CBT paper consists of 80 four-option questions across four subjects (20 questions each, 120 minutes total), requiring at least 40 points per subject (과락 floor) and an overall average of 60 points. A subsequent composite practical examination (KRW 62,900) tests written analytical methodology and laboratory bench spectrophotometric analysis. OpenExamPrep provides 100 independent English practice MCQs covering those written topics.

Sample Engineer Chemical Analysis Practice Questions

Try these sample questions to review concepts for the Engineer Chemical Analysis exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the GHS (세계조화시스템) pictogram system used on laboratory chemical labels and SDS, which hazard class is communicated by the flame pictogram?
A.Acute toxicity (fatal or toxic if swallowed, inhaled, or in contact with skin)
B.Flammable gases, liquids, solids, pyrophorics, and self-heating substances
C.Oxidizing gases, liquids, or solids that may intensify fire
D.Corrosive damage to metals or irreversible skin burns
Explanation: The GHS flame pictogram covers flammable gases, aerosols, liquids, and solids, as well as pyrophoric and self-heating substances and substances that emit flammable gas in contact with water. Oxidizers use the flame-over-circle pictogram, acute toxicity uses the skull and crossbones, and corrosives use the corrosion pictogram. Correct pictogram recognition is a core 화학의 이해와 환경안전관리 skill.
2How many numbered sections does a GHS-format Safety Data Sheet (물질안전보건자료, SDS) contain?
A.8
B.12
C.16
D.20
Explanation: The GHS SDS has 16 mandatory sections, covering identification, hazards, composition, first aid, fire-fighting, accidental release, handling/storage, exposure controls/PPE, physical/chemical properties, stability/reactivity, toxicological information, ecological information, disposal, transport, regulatory information, and other information. Korean 물질안전보건자료 follows this 16-section structure.
3Which pair of chemicals must not be stored together because they can react violently or generate a toxic gas?
A.Sodium chloride and potassium chloride
B.Concentrated sulfuric acid and sodium cyanide
C.Ethanol and deionized water
D.Nitrogen gas and helium gas
Explanation: Strong acids react with cyanide salts to release hydrogen cyanide (HCN) gas, which is acutely toxic. Segregation of acids from cyanides, sulfides, and hypochlorites is a standard chemical-storage incompatibility rule in 환경안전관리. Sodium chloride with potassium chloride, ethanol with water, and inert gases do not present this reactive hazard.
4When pouring concentrated hydrochloric acid at an open bench is unavoidable for a short transfer, which combination is the minimum appropriate PPE?
A.Street clothes and prescription eyeglasses only
B.Chemical splash goggles, chemical-resistant gloves, and a lab coat or chemical-resistant apron
C.Nitrile gloves only, with no eye protection
D.A dust mask rated for particulates only
Explanation: Concentrated HCl is corrosive and produces irritating vapors. Splash goggles protect the eyes, chemically resistant gloves protect the skin, and a lab coat or apron protects clothing and skin. Particulate dust masks do not protect against acid vapors, and prescription glasses without side protection are not splash goggles.
5ISO/IEC 17025 is the international standard that specifies general requirements for which of the following?
A.The competence of testing and calibration laboratories
B.Environmental management systems of manufacturing plants
C.Occupational health and safety management systems
D.Quality management systems of any organization regardless of testing activity
Explanation: ISO/IEC 17025 specifies general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories. It is the accreditation standard used for analytical laboratories, covering method validation, measurement traceability, uncertainty, and quality control. ISO 14001 (environment), ISO 45001 (OH&S), and ISO 9001 (generic QMS) are different standards.
6A laboratory waste bottle is labeled as halogenated organic solvent waste. Which spent solvent should be placed in that container?
A.Hexane rinses from a nonpolar extraction
B.Acetone used to rinse glassware after aqueous work
C.Dichloromethane (methylene chloride) from a liquid–liquid extraction
D.Methanol used as an HPLC mobile-phase component with water
Explanation: Halogenated organic waste includes chlorinated solvents such as dichloromethane, chloroform, and carbon tetrachloride. Mixing halogenated and non-halogenated organics increases disposal cost and can create incompatible waste streams. Hexane, acetone, and methanol are non-halogenated and belong in a separate organic-solvent waste container unless a site procedure explicitly combines them.
7Diethyl ether that has been stored for many months in a partly emptied bottle is a peroxide-forming solvent. Which control is the appropriate laboratory practice?
A.Evaporate the ether to dryness on a hot plate to concentrate any residue
B.Date the container on receipt and opening, test for peroxides before distillation, and discard according to the institutional peroxide-former policy
C.Store the opened bottle in direct sunlight to photobleach peroxides
D.Neutralize suspected peroxides by adding concentrated sulfuric acid
Explanation: Ethers form explosive organic peroxides on standing, especially when air is present and inhibitors are depleted. Containers are dated, inventories are limited, peroxide tests (e.g., peroxide test strips) are required before distillation, and expired material is disposed of as hazardous waste. Evaporating to dryness or heating concentrated peroxides can detonate them; sunlight accelerates peroxide formation; sulfuric acid is not a neutralization method for ether peroxides.
8In ISO 14644-1 cleanroom classification, ISO Class 5 allows a maximum of 3,520 particles ≥0.5 μm per cubic meter. ISO Class 7 allows 352,000 particles ≥0.5 μm per cubic meter. How many times cleaner is the ≥0.5 μm particle limit of ISO 5 compared with ISO 7?
A.10 times
B.50 times
C.100 times
D.1,000 times
Explanation: 352,000 / 3,520 = 100. Each ISO class step of 1 corresponds to a factor of 10 in the 0.5 μm particle-number limit (ISO 5 → 6 is 10×, ISO 5 → 7 is 100×). Cleanroom classification appears in laboratory environmental-control topics for contamination-sensitive analysis.
9Hydrofluoric acid (HF) skin exposure is uniquely dangerous because fluoride ions penetrate tissue and bind calcium. After copious water rinsing, which first-aid treatment is specifically used for HF burns?
A.Application of calcium gluconate gel to the exposed skin
B.Application of concentrated sodium hydroxide to neutralize the acid
C.Immediate use of a tourniquet proximal to the burn
D.Covering the burn with dry ice to freeze fluoride in place
Explanation: After emergency rinsing, 2.5% calcium gluconate gel is the specific topical treatment that binds F− as insoluble calcium fluoride and limits deeper tissue damage. Alkali neutralization on skin is itself injurious, tourniquets are not HF first aid, and freezing the tissue is not an accepted protocol. HF first aid is a high-stakes 환경안전관리 item.
10Which statement correctly describes secondary containment for liquid hazardous chemicals in a laboratory storage cabinet?
A.Secondary containment is optional if the primary bottle is glass
B.Trays or tubs should be chemically compatible and able to hold at least the volume of the largest container, commonly specified as about 110% of that volume
C.Cardboard boxes are preferred because they absorb spills
D.Secondary containment must be sealed airtight so vapors cannot escape during a leak
Explanation: Secondary containment (trays, tubs) captures leaks from the primary container. Capacity is typically at least the largest container’s volume, often specified near 110% so the spill is retained. The tray material must resist the stored chemicals. Cardboard is permeable and combustible; airtight sealing is not the usual design and can trap incompatible vapors.

About the Engineer Chemical Analysis Exam

Engineer Chemical Analysis (화학분석기사) is South Korea's premier Engineer-grade national technical qualification for analytical chemists, quality control specialists, and laboratory researchers. Administered by HRD Korea on Q-Net under the Ministry of Trade, Industry and Resources (MOTIR / 산업통상부), the certification validates comprehensive expertise across chemical laboratory safety, ISO/IEC 17025 compliance, wet chemical quantitative analysis, optical and atomic spectroscopy (UV-Vis, FT-IR, AAS, ICP-OES), chromatographic separations (GC, HPLC), thermal analysis (TGA, DSC), mass spectrometry, nuclear magnetic resonance (NMR), X-ray diffraction (XRD), electron microscopy (SEM, TEM), and surface spectroscopy (XPS, AES). Following the 80-question written examination, successful candidates take a composite practical exam combining advanced analytical problem solving (필답형, 2 hours) and laboratory bench experiments (작업형, ~3.5 hours). The questions on this page provide an independent English-language MCQ study adaptation designed to master core concepts, calculation mechanics, and regulatory competencies.

Exam sponsor: HRD Korea (Q-Net) / Ministry of Trade, Industry and Resources (MOTIR / 산업통상부). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written CBT examination covering Understanding of Chemical Analysis & Environmental Safety Management (화학의 이해와 환경안전관리), Analysis Plan Establishment & Fundamentals of Analytical Chemistry (분석계획 수립과 분석화학기초), Characteristic Analysis of Chemical Substances (화학물질 특성분석), and Structure Analysis & Surface Analysis of Chemical Substances (화학물질구조 및 표면분석) (20 items and 30 minutes each, total 80 items and 120 minutes), followed by a composite practical examination in Chemical Analysis Practice (화학분석 실무: 60-point written response exam + 40-point laboratory testing bench exam). OpenExamPrep study weights match the four equal written subjects (25 items each, 100 total).

Time Limit

120 minutes for the four written subjects (30 minutes each); approximately 5.5 hours for the composite practical examination

Passing Score

Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 62,900 practical (Q-Net, 2026-09-20)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Understanding of Chemical Analysis & Environmental Safety Management (화학의 이해와 환경안전관리)

Laboratory safety regulations, MSDS/GHS chemical hazard symbols and pictograms, toxic chemical classifications, chemical storage incompatibilities, hazardous waste segregation and neutralization, personal protective equipment (PPE), cleanroom ISO classifications, standard operating procedures (SOP), ISO/IEC 17025 laboratory accreditation, and analytical QA/QC protocols.

25%

Analysis Plan Establishment & Fundamentals of Analytical Chemistry (분석계획 수립과 분석화학기초)

Representative sampling theory, sample dissolution and digestion (acid microwave digestion, flux fusion), statistical data evaluation (mean, standard deviation, %RSD, confidence intervals, Student's t-test, F-test, Grubbs and Dixon Q-tests for outliers, calibration curves, method of standard additions, internal standards, LOD and LOQ), chemical stoichiometry, molarity, normality, molality, acid-base equilibrium, pH calculations, buffer capacity, solubility product (Ksp), complexometric titrations (EDTA), and redox titrations (permanganometry, iodometry).

25%

Characteristic Analysis of Chemical Substances (화학물질 특성분석)

UV-Vis spectrophotometry (Beer-Lambert law, molar absorptivity, chromophores, auxochromes, instrumentation, slit width, stray light errors), FT-IR spectroscopy (molecular vibrations, Hooke's law, IR active dipoles, functional group region 4000-1500 cm-1, fingerprint region, ATR accessories), atomic spectroscopy (Flame/Graphite Furnace AAS, hollow cathode lamps, chemical/spectral interferences; ICP-OES argon plasma, nebulizers, multi-element analysis), chromatography fundamentals (van Deemter equation, resolution Rs, plate count N, retention factor k, selectivity alpha), Gas Chromatography (GC carrier gases, split/splitless injection, stationary phases, FID, TCD, ECD detectors), High-Performance Liquid Chromatography (HPLC normal vs reversed-phase, C18 columns, isocratic vs gradient elution, degassing, UV-Vis, RI, fluorescence detectors), and thermal analysis (TGA mass loss curves, DSC glass transition Tg, melting Tm, crystallization Tc).

25%

Structure Analysis & Surface Analysis of Chemical Substances (화학물질구조 및 표면분석)

Mass Spectrometry (MS ionization methods: EI, ESI, MALDI; mass analyzers: quadrupole, time-of-flight TOF, magnetic sector; fragmentation patterns, nitrogen rule, isotopic distributions for chlorine and bromine), Nuclear Magnetic Resonance (1H-NMR and 13C-NMR chemical shifts, TMS reference, spin-spin splitting n+1 rule, coupling constants J, peak integration, deuterated solvents), X-ray Diffraction (XRD Bragg's law nλ = 2d sinθ, crystal lattices, Scherrer equation for crystallite size), Electron Microscopy (SEM secondary electrons for surface topography, backscattered electrons for compositional contrast, TEM bright-field/dark-field imaging and electron diffraction, EDS/EDX elemental microanalysis), and Surface Analysis (X-ray Photoelectron Spectroscopy XPS/ESCA photoelectric effect, binding energies, chemical oxidation states, and Auger Electron Spectroscopy AES).

Preparing for the Engineer Chemical Analysis Exam

What You Need to Know

  • Passing score: Written: 40+ per subject (과락 floor) and 60 average out of 100; practical: 60/100
  • Assessment: Written CBT examination covering Understanding of Chemical Analysis & Environmental Safety Management (화학의 이해와 환경안전관리), Analysis Plan Establishment & Fundamentals of Analytical Chemistry (분석계획 수립과 분석화학기초), Characteristic Analysis of Chemical Substances (화학물질 특성분석), and Structure Analysis & Surface Analysis of Chemical Substances (화학물질구조 및 표면분석) (20 items and 30 minutes each, total 80 items and 120 minutes), followed by a composite practical examination in Chemical Analysis Practice (화학분석 실무: 60-point written response exam + 40-point laboratory testing bench exam). OpenExamPrep study weights match the four equal written subjects (25 items each, 100 total).
  • Time limit: 120 minutes for the four written subjects (30 minutes each); approximately 5.5 hours for the composite practical examination
  • Exam / certification fees: KRW 19,400 written / KRW 62,900 practical (Q-Net, 2026-09-20) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Engineer Chemical Analysis: Suggested Study Strategy

1Master quantitative chemical equilibrium and statistical calculations: thoroughly practice acid-base buffer pH, solubility product (Ksp), EDTA titrations, and analytical QA/QC formulas (%RSD, Student's t-test, detection limits LOD = 3.3 * s / S, LOQ = 10 * s / S).
2Avoid the 40-point per-subject failure floor (과락) by maintaining balanced preparation; instrumental spectroscopy (FT-IR, UV-Vis, AAS, ICP-OES) and surface analysis methods (XPS, SEM/EDS, XRD) feature heavily and require deep conceptual precision.
3Understand the mechanics and optics of chromatographic systems: memorize the van Deemter equation terms (A, B/u, Cu), plate count formulas (N = 16(t_R/W)^2 = 5.545(t_R/W_0.5)^2), chromatographic resolution (Rs), and column chemistry differences between normal-phase and reversed-phase HPLC.
4Prepare for the practical exam early by reviewing UV-Vis spectrophotometry workflows: standard calibration curve linearity (R^2 >= 0.999), dilution factor propagation, blank subtraction, and proper volumetric pipetting technique.

Frequently Asked Questions

What is Engineer Chemical Analysis (화학분석기사)?

Engineer Chemical Analysis (화학분석기사) is South Korea's certified Engineer-grade national technical qualification for professional analytical chemists, quality control specialists, and laboratory researchers, administered by the Human Resources Development Service of Korea (HRD Korea / Q-Net) under the Ministry of Trade, Industry and Resources (MOTIR / 산업통상부).

What is the official exam structure and passing standard in 2026?

The written examination consists of 80 four-option multiple-choice questions across four subjects: (1) Understanding of Chemical Analysis & Environmental Safety Management, (2) Analysis Plan Establishment & Fundamentals of Analytical Chemistry, (3) Characteristic Analysis of Chemical Substances, and (4) Structure Analysis & Surface Analysis of Chemical Substances (20 questions each, 120 minutes total). To pass, candidates must score at least 40 points in every subject (과락 floor) and achieve an overall average of 60 points or higher out of 100. Successful candidates qualify for the practical examination.

How does the practical examination (실기시험) work for 화학분석기사?

The practical exam is a composite examination (복합형) consisting of two mandatory components totaling 100 points: a written analytical test (필답형, 2 hours, 60 points) evaluating instrumental spectra interpretation, analytical method validation, and quantitative stoichiometry calculations; and an in-person wet chemistry / instrumental testing session (작업형, approximately 3.5 hours, 40 points) typically involving standard solution preparation, spectrophotometric calibration curves (UV-Vis), and unknown sample concentration determination. The passing score is 60 points or higher out of 100.

What are the official registration fees and validity periods?

According to the official Q-Net qualification schedule checked on 2026-09-20 (jmCd=1563), the written examination fee is KRW 19,400 and the practical examination fee is KRW 62,900. Under Article 21 of the National Technical Qualifications Act Enforcement Decree, candidates who pass the written exam are granted an exemption from retaking the written exam for exactly 2 years from the pass announcement date.

What language is the official examination conducted in, and how does OpenExamPrep help?

The official Q-Net examination is administered in Korean. OpenExamPrep provides an independent, comprehensive English-language study adaptation with authentic technical calculations and standard Korean technical terms in parentheses. It enables international scientists, bilingual students, and Korean engineers to master core chemical analysis principles, calculation mechanics, and instrumental workflows.

What tools and calculators are permitted during the examination?

Candidates are permitted to use non-programmable scientific calculators compliant with HRD Korea's approved calculator model list. For the practical laboratory component, test-takers must bring their own personal protective equipment (PPE) including an approved lab coat, splash goggles, and safety gloves, as failure to wear required PPE results in disqualification.