Science test

1. Scientific Method, Questions, and Hypotheses

  • Problem Statement

    • A clear, testable question explaining what the experiment aims to discover (e.g., "How does the amount of water affect seed germination speed?").

  • Observation vs. Inference

    • Observation: Gathering facts directly using the five senses or measuring tools (e.g., observing that liquid volume is 45 mL45mL).

    • Inference: A logical conclusion or explanation based on observations and prior knowledge.

  • Formulating a Hypothesis

    • Hypothesis: A testable prediction about the outcome of an experiment.

    • Standard format: "If [independent variable changes], then [dependent variable changes], because [scientific reasoning]."

2. Experimental Design, Variables, and Fair Testing

  • Types of Variables

    • Independent Variable (IV): The factor intentionally changed or tested by the researcher (plotted on the X-axis).

    • Dependent Variable (DV): The factor measured or observed to gather results (plotted on the Y-axis).

    • Controlled Variables (Constants): Factors kept strictly identical across all conditions to ensure a fair test.

  • Fair Testing

    • An experiment where only ONE independent variable is changed at a time while all other conditions are kept constant.

    • Ensures that observed changes in the dependent variable are caused solely by the independent variable.

  • Experimental Groups

    • Control Group: The standard baseline group that does not receive the experimental treatment, used for direct comparison.

    • Experimental Group: The group that receives the variable or treatment being tested.


  • 3. Measurement Skills and Mathematical Tools

    • Place Value and Rounding

      • Place Value: Understanding tenths (0.10.1), hundredths (0.010.01), and thousandths (0.0010.001) for recording precise lab data.

      • Rounding Rules: Identify the digit in the target place value, then look at the digit directly to its right. If that digit is 55 or greater, round up; if less than 55, keep the target digit the same (e.g., 14.36 g14.36g rounded to the nearest tenth is 14.4 g14.4g).

    • Lab Measurements

      • Length: Measured in meters (mm), centimeters (cmcm), or millimeters (mmmm) using a metric ruler.

      • Mass: Measured in grams (gg) or kilograms (kgkg) using a digital balance or triple beam balance.

      • Volume: Measured in liters (LL) or milliliters (mLmL) using a graduated cylinder.

      • Meniscus: Read liquid volume at eye level from the bottom center of the curved surface.

      • Temperature: Measured in degrees Celsius (∘C∘C) using a thermometer.

    • Reading a Force Meter (Spring Scale)

      • Measures force or weight in Newtons (NN).

      • Steps for Accurate Reading:

      • Zero the scale by ensuring the pointer aligns with 0 N0N when hanging empty.

      • Hold the scale vertically without shaking.

      • Read the scale mark aligned with the flat edge of the internal indicator ring at eye level.

    4. Scientific Communication: Drawings, Data Tables, and Graphs

    • Scientific Design Drawings

      • Simple, neat, two-dimensional (2D2D) diagrams drawn in pencil.

      • Uses clean lines without shading, coloring, or 3D effects.

      • Include straight, horizontal ruler lines for labels without crossing lines.

    • Data Tables

      • Include a descriptive title detailing both variables.

      • Place the independent variable in the left column and the dependent variable in the right column.

      • Include units only in the column header (e.g., Time (ss)), not beside individual numbers.

    • Creating Graphs

      • Line Graph: Shows continuous data and changes over time.

      • Bar Graph: Compares distinct categories or groups.

      • Graph Elements:

      • Title stating the relationship between variables.


    • X-axis labeled with the independent variable and unit.

    • Y-axis labeled with the dependent variable and unit.

    • Scale with uniform, evenly spaced numeric intervals.

  • Interpreting Graphs

    • Direct Relationship: As the independent variable increases, the dependent variable increases.

    • Inverse Relationship: As the independent variable increases, the dependent variable decreases.

    • Constant: Data points form a flat line, showing no change.

5. Research Skills, Conclusions, and CER

  • Research Skills

    • Locate information using reputable scientific websites, books, or database sources.

    • Summarize key ideas in your own words and properly cite source titles and authors to avoid plagiarism.

  • Claim, Evidence, Reasoning (CER) Framework

    • Claim: A direct statement answering the original research question or problem statement.

    • Evidence: Specific quantitative numbers or qualitative observations collected during testing.

    • Reasoning: Scientific facts and principles explaining how the evidence supports the claim.

  • Lab Reports and Helpful Hints

    • Standard Structure: Title, Purpose/Problem Statement, Hypothesis, Variables, Materials, Procedure, Data Table & Graph, Analysis (CER), and Conclusion.

    • Report Hints:

    • Write procedures clearly so someone else can repeat the test.

    • Always include correct metric units on measurements and graph axes.

    • Double check math calculations and rounding before writing final conclusions.