Science Content Knowledge: Core Ideas and How They Are Tested
What this domain covers
Science Content Knowledge asks you to reason across the major middle-school science strands: physical science (matter, motion, energy, waves), life science (cells, heredity, ecosystems, evolution), Earth and space science (rocks and plate tectonics, weather and climate, Earth–Sun–Moon relationships), and the engineering connections that tie them together. Questions usually present a short scenario and ask you to predict, explain, or identify a misconception.
Concepts to master
Be fluent with conservation laws (mass, energy), the particle model of matter, density as mass per unit volume, Newton's three laws and the distinction between speed, velocity, and acceleration, energy transfer in waves and circuits, photosynthesis and cellular respiration as complementary processes, food webs and energy pyramids, the rock cycle, and the causes of seasons and moon phases. Know that energy pyramids show only about 10% transfer between trophic levels, and that mass is conserved in chemical reactions even when a gas escapes.
Common traps
Watch for distractors that sound scientific but confuse correlation with causation, treat energy as "used up" rather than transferred, or swap the roles of photosynthesis and respiration. Seasons are caused by axial tilt, not distance from the Sun - a frequent trap. Density questions often hinge on whether volume or mass is held constant.
Worked rule of thumb
When a question asks "what happens to X," name the principle first (e.g., conservation of energy), then apply it step by step. For a 100 g block with volume 20 cm³: density = 100 ÷ 20 = 5 g/cm³, so it sinks in water (density 1 g/cm³). State the principle, do the arithmetic, then interpret.