. For a subject like chemistry, which involves complex calculations, chemical equations, and theoretical explanations, the scheme provides a precise breakdown of how points are awarded for specific steps or keywords. Core Components of a Chemistry Marking Scheme
| Step | Student Action | Mark Scheme Expectation | Mark? | | :--- | :--- | :--- | :--- | | 1 | 0.1 x 0.25 = 0.025 | Correct conversion of cm³ to dm³ (250/1000 = 0.25) AND multiplication to find moles (M x V). | Yes (The numbers are there, albeit messy). | | 2 | 0.025 x 40 = 1 | Mark 2: Correct rearrangement (n x M = mass). | Yes | | 3 | "1g" | Mark 3: Correct units (g) AND correct significant figures. (Raw data has 3 SF: 0.100 has 3, 40.0 has 3, 250 has 3). Answer must be 1.00 g. | No (Lost mark for missing "1.00" and units not bracketed). | marking scheme chemistry
For every question you lost a mark on, highlight the in the mark scheme you missed. | | :--- | :--- | :--- | :--- | | 1 | 0
Chemistry is an exact science, and the marking scheme reflects that. | Yes | | 3 | "1g" |