Skip to main content
Hingga ujian berikutnya 14–15 November 2026:
Semua konsep

Chemical Equilibrium

化学平衡

What equilibrium actually is and how to test for it, and which way the position shifts when temperature, pressure or concentration changes (Le Chatelier's principle).

12 soal ujian asli · 4 kali ujian10 soal tryout14 soal latihan

Ujian CSCA dikerjakan dalam bahasa Mandarin atau Inggris — peserta memilih sendiri. Karena itu konsep dan rumus di sini disajikan dalam kedua bahasa tersebut; halaman ini menampilkan versi bahasa Inggris.

Rumus

  • Equilibrium constant

    Hukum
    K=cp(C)⋅cq(D)cm(A)⋅cn(B)K=\frac{c^p(\mathrm{C})\cdot c^q(\mathrm{D})}{c^m(\mathrm{A})\cdot c^n(\mathrm{B})}

    Berlaku bila：For mA+nB ⇌ pC+qD; K changes with temperature only. Pure solids and pure liquids are omitted from the expression

Cara ujian sebenarnya menguji konsep ini

Soal dari ujian CSCA sebenarnya yang menguji konsep ini. Kerjakan sendiri dulu sebelum membuka jawabannya.

  1. CSCA Chemistry December 2025 Past Paper
    When a reaction reaches equilibrium, which of the following must be equal in the reaction system? ( )
    • A. The time atoms spend in reactant molecules equals the time in product molecules
    • B. Reactant concentrations equal product concentrations
    • C. Forward reaction rate equals reverse reaction rate
    • D. The mass of reactants equals the mass of products
    Lihat jawaban & pembahasan

    Jawaban: C

    Answer: C Chemical equilibrium is dynamic: the forward rate equals the reverse rate, so macroscopic properties stay constant while the reaction continues. Reactant and product concentrations (or masses) are constant at equilibrium but need not be equal.
    Lihat di CSCA Chemistry December 2025 Past Paper lengkap
  2. CSCA Chemistry March 2026 Past Paper
    When H2( g)+I2( g)⇌2HI(g)\mathrm { H } _ { 2 } ( \mathrm {~g} ) + \mathrm { I } _ { 2 } ( \mathrm {~g} ) \rightleftharpoons 2 \mathrm { HI } ( \mathrm { g } ) reaches equilibrium, which is correct?
    • A．The reaction has stopped
    • B．All concentrations no longer change
    • C．Both forward and reverse rates are zero
    • D．All reactants fully converted to products
    Lihat jawaban & pembahasan

    Jawaban: B

    At equilibrium: concentrations constant ( B∨B \vee ). Reaction continues (A wrong). Rates ≠0\neq 0 ( CC wrong). Not complete conversion (D wrong). Answer: B.
    Kerjakan CSCA Chemistry March 2026 Past Paper lengkap — berwaktu & dinilai
  3. CSCA Chemistry April 2026 Past Paper
    For the reaction X(g) + 3Y(g) ⇌ 2Z(g) (the forward reaction is endothermic), which of the following operations can shift the equilibrium in the forward direction? ( )
    • A. Lowering the temperature and increasing the pressure
    • B. Lowering the temperature and decreasing the pressure
    • C. Raising the temperature and increasing the pressure
    • D. Raising the temperature and decreasing the pressure
    Lihat jawaban & pembahasan

    Jawaban: C

    Answer: C The forward reaction is endothermic and the number of gas molecules decreases (4 → 2); raising the temperature and increasing the pressure shift the equilibrium forward.
    Kerjakan CSCA Chemistry April 2026 Past Paper lengkap — berwaktu & dinilai

Bukti dari ujian asli

Kemunculan pada arsip ujian dicantumkan di bawah; bagian yang dapat diverifikasi online diberi label terpisah.

12 soal dari 4 kali ujian1/4 ujian dapat diverifikasi gratis secara online

10 soal dari 5 paket tryout — paket buatan kami sendiri, jadi ini sinyal cakupan, bukan bukti ujian asli

Tersedia 14 soal latihan terkaitLatihan gratis: Laju Reaksi Kimia dan Kesetimbangan

Bukti ujian asli berasal dari arsip ujian CSCA yang tercatat; soal yang naskah aslinya hilang dikecualikan, dan paket sprint sengaja tidak dihitung.

Konsep terkait

Rate of Reaction