Korea Grade 12 Chemistry I free practice questions with answers
Read question 1 and its full worked answer from paper 1 of our 20-paper Korea Grade 12 Chemistry I set, then download the 4-page PDF. These are original practice questions, not official past papers. Page updated 3 November 2026.
다음은 화학 반응식이다. CH₄ + 2O₂ → CO₂ + 2H₂O H₂O 216 g이 모두 반응할 때 반응하거나
생성되는 CO₂의 질량(g)은? (단, 분자량 또는 원자량은 CH₄ 16, O₂ 32, CO₂ 44, H₂O 18이다.)
[3점]
A 264 g
B 308 g
C 314 g
D 364 g
E 528 g
[화학의 첫걸음]
Correct answer: A — 264 g
- H₂O의 몰 수는 216 ÷ 18 = 12 몰 입니다.
- 계수비 H₂O : CO₂ = 2 : 1 이므로 CO₂의 몰 수는 6 몰 입니다.
- CO₂의 질량 = 6 × 44 = 264 g 입니다.
화학 반응식의 계수비는 몰 수의 비이므로 질량을 몰 수로 바꾸어 계산하고, 두 반응물이 있으면 먼저
소모되는 한계 반응물을 찾습니다.
Your sample is downloading. Liked it? Korea Grade 12 Chemistry I Paper 1 is the full paper: 20 five-choice questions in 30 minutes on the 2015 revised Chemistry I course (moles, atoms, bonding, reactions), written in Korean, with calculation questions, with a worked solution for every question.
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Questions about this sample
What is in the Korea Grade 12 Chemistry I free sample?
The first 3 questions from paper 1 of the set, in the real exam layout, followed by the step-by-step worked answers. It is a 4-page PDF; this page shows question 1 with its answer.
How many full Korea Grade 12 Chemistry I papers are there?
20 original papers for Grade 12 (고3) students in South Korea following the 2015 revised curriculum: Chemistry I (화학Ⅰ). Each is 20 five-choice questions in 30 minutes on the 2015 revised Chemistry I course (moles, atoms, bonding, reactions), written in Korean, with calculation questions, with a worked solution for every question. Papers start at A$11.99 and download instantly as a PDF.
Are these official past papers?
No. The sample is taken from our own original practice paper and is not an official past paper or affiliated with any exam authority.