Year 9 Science

Year 9 Science skills

Find the exact skill a learner needs, understand it clearly and open the right teaching or practice resource.

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Skills are grouped by curriculum strand. Exact Australian Curriculum wording remains available on every card.

Science understanding

7 skills
AC9S9U01

Science understanding

Body systems, homeostasis and negative feedback

Learn how receptors detect change, nervous and endocrine pathways coordinate responses, effectors act, and negative feedback helps keep internal conditions within a…

ExampleWhen you step outside into bright sunlight, your pupils:

Official curriculum wording

compare the role of body systems in regulating and coordinating the body’s response to a stimulus, and describe the operation of a negative feedback mechanism

AC9S9U02

Science understanding

Reproductive cells, organs and species survival

Connect reproductive structures to their functions, compare sexual and asexual reproduction, and reason about how each strategy affects variation, population growth and…

ExampleThe main function of the testes is to:

Official curriculum wording

describe the form and function of reproductive cells and organs in animals and plants, and analyse how the processes of sexual and asexual reproduction enable survival of the species

AC9S9U03

Science understanding

Carbon cycle processes and Earth systems

Track carbon as matter moving among atmosphere, biosphere, hydrosphere and geosphere, then use the model to explain how changing transfer rates can alter carbon stores

ExampleWhich description best matches the biosphere?

Official curriculum wording

represent the carbon cycle and examine how key processes including combustion, photosynthesis and respiration rely on interactions between Earth’s spheres (the geosphere, biosphere, hydrosphere and atmosphere)

AC9S9U04

Science understanding

Wave and particle models of energy transfer

Use two scientific models for different explanatory jobs: wave features describe patterns of transfer, while particle interactions explain how energy moves through a…

ExampleWhy does a metal spoon become hot when one end sits in hot soup?

Official curriculum wording

use wave and particle models to describe energy transfer through different mediums and examine the usefulness of each model for explaining phenomena

AC9S9U05

Science understanding

Conservation of energy and system efficiency

Define a system, account for all energy outputs, calculate efficiency and explain why “wasted” energy is transferred to less useful stores rather than destroyed

ExampleA device receives 500 J and transfers 350 J to the intended useful output. How much energy is transferred to other, less useful outputs?

Official curriculum wording

apply the law of conservation of energy to analyse system efficiency in terms of energy inputs, outputs, transfers and transformations

AC9S9U06

Science understanding

Atomic models, evidence and radioactive decay

Follow how new experimental evidence forced scientists to revise atomic models, then connect unstable nuclei and natural radioactive decay to more stable nuclear…

ExampleWhich statement correctly compares the three main subatomic particles?

Official curriculum wording

explain how the model of the atom changed following the discovery of electrons, protons and neutrons and describe how natural radioactive decay results in stable atoms

AC9S9U07

Science understanding

Atom rearrangement, equations and conservation of mass

Model reactions as rearrangements of existing atoms, move between word, particle and symbolic representations, and use balanced equations to show why mass is conserved in…

ExampleIn 2H₂ + O₂ → 2H₂O, which substances are the reactants?

Official curriculum wording

model the rearrangement of atoms in chemical reactions using a range of representations, including word and simple balanced chemical equations, and use these to demonstrate the law of conservation of mass

Science as a human endeavour

4 skills
AC9S9H01

Science as a human endeavour

Scientific validation, publication and peer review

Understand scientific validation as an evidence system: transparent methods, critical review, publication, replication and accumulated evidence can strengthen, challenge…

ExampleWhat is the main purpose of peer review before publication?

Official curriculum wording

explain how scientific knowledge is validated and refined, including the role of publication and peer review

AC9S9H02

Science as a human endeavour

Technology enables scientific and engineering advances

Trace two-way causal chains: better technologies change what scientists can observe or measure, while scientific explanations enable new technologies and engineering…

ExampleWhy has MRI technology advanced scientific understanding of body systems?

Official curriculum wording

investigate how advances in technologies enable advances in science, and how science has contributed to developments in technologies and engineering

AC9S9H03

Science as a human endeavour

Science adoption: evidence, trust, access and values

Scientific evidence can be strong while adoption remains uneven. Analyse how trust, feasibility, cost, access, risk, communication, policy and community values shape…

ExampleWhich combination most strongly explains why a scientific practice may be adopted widely by society?

Official curriculum wording

analyse the key factors that contribute to science knowledge and practices being adopted more broadly by society

AC9S9H04

Science as a human endeavour

Society, values and scientific research priorities

Research resources are finite. Learn how public need, urgency, equity, expected benefit, cost, ethics and community priorities can influence which scientific questions…

ExampleWhy might a government increase funding for antibiotic-resistance research?

Official curriculum wording

examine how the values and needs of society influence the focus of scientific research

Science inquiry

8 skills
AC9S9I01

Science inquiry

Investigable questions, hypotheses and predictions

Turn broad curiosities into questions that can be answered with evidence, then write predictions and hypotheses that connect measurable variables to scientific reasoning

ExampleWhich question is most clearly investigable?

Official curriculum wording

develop investigable questions, reasoned predictions and hypotheses to test relationships and develop explanatory models

AC9S9I02

Science inquiry

Plan and conduct valid, reproducible investigations

Design investigations so the evidence answers the question: control important variables, repeat appropriately, identify error sources, manage risk and ethics, and respect…

ExampleWhich change most directly improves the validity of an investigation testing how exercise intensity affects heart rate?

Official curriculum wording

plan and conduct valid, reproducible investigations to answer questions and test hypotheses, including identifying and controlling for possible sources of error and, as appropriate, developing and following risk assessments, considering ethical issues, and addressing key considerations regarding heritage sites and artefacts on Country/Place

AC9S9I03

Science inquiry

Equipment, precision and replicable data

Choose equipment whose range and resolution suit the question, record measurements honestly, collect a useful sample and use digital tools because they improve…

ExampleA balance displays 12.43 g. What is this value to 3 significant figures?

Official curriculum wording

select and use equipment to generate and record data with precision to obtain useful sample sizes and replicable data, using digital tools as appropriate

AC9S9I04

Science inquiry

Representing and processing scientific data

Choose representations because they answer the investigation question: tables organise raw values, graphs reveal patterns, statistics summarise variation and models or…

ExampleWhich graph is most suitable for showing how water temperature changes during 15 minutes of cooling?

Official curriculum wording

select and construct appropriate representations, including tables, graphs, descriptive statistics, models and mathematical relationships, to organise and process data and information

AC9S9I05

Science inquiry

Analyse patterns, trends, relationships and anomalies

Move from “the graph goes up” to evidence-based analysis: quantify patterns, compare sources, investigate anomalies and distinguish association from causation

ExampleA dataset changes 12, 15, 18, 21, 24 as time increases. Which description is best?

Official curriculum wording

analyse and connect a variety of data and information to identify and explain patterns, trends, relationships and anomalies

AC9S9I06

Science inquiry

Validity, reproducibility and evidence quality

Judge methods and conclusions separately, locate assumptions, compare conflicting evidence and calibrate claims to uncertainty instead of using “reliable” as a catch-all…

ExampleA news article says a supplement 'doubles concentration' but cites only a company testimonial. What is the main weakness?

Official curriculum wording

assess the validity and reproducibility of methods and evaluate the validity of conclusions and claims, including by identifying assumptions, conflicting evidence and areas of uncertainty

AC9S9I07

Science inquiry

Construct evidence-based scientific arguments

Build claims that are proportional to varied evidence, explain how evidence supports the reasoning, address limitations and counter-evidence, and use secondary data…

ExampleWhich feature most strengthens confidence in a secondary scientific source?

Official curriculum wording

construct arguments based on analysis of a variety of evidence to support conclusions or evaluate claims, and consider any ethical issues and cultural protocols associated with accessing, using or citing secondary data or information

AC9S9I08

Science inquiry

Scientific communication for purpose and audience

Communicate the same science differently when purpose and audience change—without changing the evidence. Choose structure, terminology, visuals and digital tools that…

ExampleWhich change best adapts a technical scientific explanation for a general audience without losing accuracy?

Official curriculum wording

write and create texts to communicate ideas, findings and arguments effectively for identified purposes and audiences, including selection of appropriate content, language and text features, using digital tools as appropriate