KH-SCI-IIS9 · After Unit 07 · Transition Benchmark
Units 05–07 Cumulative Chapter Test
Ecosystems, biodiversity and origins evidence; atomic structure and periodic patterns; bonding, reactions, chemical energy, rates, and conservation.
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Evidence and belief-neutral assessment
Unit 05 questions distinguish observation, measurement, scientific inference, methodological naturalism, and worldview interpretation. Personal belief is not scored. Accuracy, evidence classification, reasoning, source fairness, and respect are scored.
Objective assessment
Complete all 60 questions
Work carefully through Units 05–07, monitor your answered-question count, and submit only after reviewing the complete test.
Assessment results
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Objective Result
Constructed section
Four responses complete the 100-point benchmark
Each response is scored from 0–10 using the educator rubric.
Unit 05
Ecological Evidence, Diversity, and Origins Reasoning
A monitored population changes from 800 individuals to 680. At Site A, four species have counts 4, 4, 4, and 4. At Site B, the same four species have counts 13, 1, 1, and 1. Calculate the population percentage change. Compare richness, abundance, evenness, and likely diversity at the two sites. State one direct observation and one causal inference that would require additional evidence. Propose one conservation action and a measurable outcome. Finally, explain the difference among observed microevolution, evidence relevant to speciation, and macroevolutionary historical reconstruction. Distinguish a measured fossil feature from a phylogenetic relationship, and explain how creation, evolutionary, intelligent-design, evolutionary-creation, or undecided interpretations can be discussed without grading personal belief.
Unit 06
Atomic Identity, Isotopes, and Periodic Prediction
For ³⁷₁₇Cl⁻, determine the numbers of protons, neutrons, and electrons; atomic number; mass number; and net charge. Using chlorine-35 mass 34.9689 u at 75.76% and chlorine-37 mass 36.9659 u at 24.24%, calculate the weighted atomic mass. Explain why that value is not the mass number of every chlorine atom. Write the neutral chlorine shell configuration, identify its period and group, predict its common simple ion, connect line spectra to quantized energy differences, and identify one limitation of the shell model.
Unit 07
Formulae, Conservation, Energy, and Reaction Rate
Construct the neutral formula formed by Ca²⁺ and NO₃⁻ and show the charge audit. Balance CH₄(g) + O₂(g) → CO₂(g) + H₂O(l), then audit C, H, and O atoms. The displayed reaction has ΔH° ≈ −890.3 kJ per mole of methane under the stated conditions. Classify the energy change and explain what a catalyst changes and does not change. Explain why measured mass may decrease in an open gas-producing system even though atoms are conserved. Design a fair comparison of reaction rate using temperature or surface area, including controls and one safety boundary.
Integration
Matter and Energy Bridge to Unit 08
Trace one carbon atom from atmospheric CO₂ into plant sugar, through a food web, into decomposer or fuel molecules, and back to CO₂. Explain why matter cycles while usable energy flows and becomes less available at higher trophic levels. Use the balanced methane-combustion equation to demonstrate atom conservation. Distinguish chemical potential energy from thermal energy transferred to the surroundings. Explain why conservation of atoms does not mean all transferred energy remains available for biological work. Identify one direct measurement, one model, and one inference in this explanation.