Grade 9 Science Worksheets

Learning Objectives

• Understand how household chemicals are used and their benefits
• Identify potential health and environmental risks of common chemicals
• Analyze the routes of chemical exposure and their impacts+ Show more

Learning Objectives

• Explain why circular motion requires a centripetal net force directed toward the center.
• Use the relationship between centripetal acceleration, speed, and radius to predict how motion changes.
• Identify and analyze the forces (tension, friction, normal force) that provide the inward centripetal force.

Learning Objectives

• Interpret position–time graphs to determine displacement.
• Describe the relationship between position, displacement, and motion along a straight line.
• Analyze how graphical representations reflect constant and changing velocity.+ Show more

Learning Objectives

• Explain how atmospheric and hydrologic forces influence geomorphic change and soil development.
• Analyze the roles of chemical and physical weathering, mass wasting, and sediment transport across different landforms.
• Evaluate how climate signals, relief, and lithology affect surface modification and landform evolution.+ Show more

Learning Objectives

• Explain how collision frequency, activation energy, and reaction pathways influence reaction rates.
• Describe how temperature, concentration, and catalysts modify energy distributions and affect reaction speed.
• Understand and interpret rate laws and reaction order through examples such as bromine-iodide kinetics.+ Show more

Learning Objectives

• Extract key ideas about how DNA sequences can indicate shared ancestry.
• Identify evidence from sequence similarity and divergence in a scientific passage.
• Use scientific vocabulary related to homologous genes and molecular clocks.

Learning Objectives

• Identify how uncertainty (error bars and uncertainty bands) is used to show limits in measurements.
• Interpret whether differences or trends are meaningful by comparing overlap or separation of uncertainties.
• Explain why measurement noise can change the strength of conclusions drawn from graphs.

Learning Objectives

• Understand the principles of quantitative and qualitative assessment in design solutions.
• Learn to interpret and create comparative matrices for decision-making.
• Evaluate trade-offs among performance metrics such as efficiency, durability, cost, and safety.+ Show more

Learning Objectives

• Identify reactants and products in chemical equations.
• Understand the importance of balancing chemical equations.
• Learn how coefficients affect the number of atoms and molecules.+ Show more

Learning Objectives

• Understand the mechanisms linking oceanic and atmospheric variability, including phenomena like ENSO.
• Analyze how sea surface temperature anomalies influence atmospheric convection and climate patterns.
• Interpret time-series analyses, lag-correlation maps, and energy-budget perspectives related to ocean–atmosphere interactions.+ Show more

Learning Objectives

• Explain how heritable variation and selective pressures lead to differential survival and reproduction in natural selection.
• Distinguish directional, stabilizing, and disruptive selection using fitness and allele-frequency ideas.
• Use examples such as finch beaks and antibiotic resistance to describe population-level adaptive change.

Learning Objectives

• Explain how range, interquartile range (IQR), variance, and coefficient of variation (CV) measure variability and what each metric reveals.
• Use variability metrics to compare datasets, interpret overlapping distributions, and evaluate confidence in estimates.
• Connect quantified variability to sampling design, heterogeneity across groups, and expectations from theoretical models.

Learning Objectives

• Define what constraints are in the context of engineering design.
• Identify various constraints that influence design choices.
• Understand how trade-offs are made when constraints limit options.+ Show more

Learning Objectives

• Understand basic weather measurements such as temperature, humidity, wind, and pressure.
• Learn how weather data patterns can indicate atmospheric conditions.
• Recognize the relationship between atmospheric measurements and observable weather phenomena.+ Show more

Learning Objectives

• Explain how chemical formulas show the fixed ratios of elements in compounds
• Distinguish ionic and covalent bonding and relate them to observable properties
• Apply the law of definite composition to predict elemental mass relationships in a compound

Learning Objectives

• Understand how inclined planes decompose gravitational force into components parallel and perpendicular to the surface.
• Explain the concept of mechanical advantage and how it reduces applied force over longer distances.
• Analyze the effects of friction and slope angle on acceleration and energy transfer during motion.+ Show more

Learning Objectives

• Explain the processes involved in nutrient cycling, including microbial decomposition, fixation, mineralization, and sedimentation.
• Describe how human activities like fertilizer runoff impact nutrient cycles and ecosystems.
• Analyze the effects of changes in nutrient cycling rates on ecosystem productivity, nutrient availability, and soil carbon storage.+ Show more

Learning Objectives

• Define inertia and understand its relation to an object's mass.
• Explain real-world examples of inertia.
• Identify how forces overcome inertia to change motion.

Learning Objectives

• Explain how optimization balances competing goals using criteria and constraints.
• Identify common tradeoffs among strength, mass, cost, durability, and efficiency in engineering design.
• Use evidence and models to compare design alternatives and choose a best-fit option.

Learning Objectives

• Explain how biogeochemical cycles move and store elements among Earth’s reservoirs
• Describe how photosynthesis, decomposition, nitrogen fixation, and weathering drive nutrient fluxes
• Compare reservoir size and flux rate and predict how disturbances can affect ecosystems+ Show more

Learning Objectives

• Understand how friction opposes relative motion between surfaces.
• Differentiate between static and kinetic friction and their effects.
• Explain factors influencing the magnitude of frictional forces.+ Show more

Learning Objectives

• Understand how evidence supports scientific claims and arguments.
• Identify patterns in data that support or weaken claims.
• Evaluate alternative explanations considering data uncertainty and bias.+ Show more

Learning Objectives

• Explain how frequency, wavelength, and amplitude describe different features of a wave
• Predict how changing one wave parameter changes a wave’s observable pattern or signal description
• Relate wave properties to energy and to different representations of the same wave

Learning Objectives

• Understand the composition and function of the phospholipid bilayer.
• Identify the roles of integral and peripheral proteins in membranes.
• Explain how cholesterol and carbohydrate chains affect membrane fluidity and recognition.+ Show more

Learning Objectives

• Describe the concept of genetic drift and how it affects populations.
• Identify different events like bottlenecks and founder effects that lead to genetic drift.
• Explain how chance influences genetic variation and evolutionary pathways in small populations.+ Show more

Learning Objectives

• Explain how mechanical energy is conserved when non-conservative forces are negligible
• Describe how kinetic and gravitational potential energy convert in real motion under gravity
• Account for energy dissipation when friction or other non-conservative forces do work+ Show more

Learning Objectives

• Understand Newton’s third law of motion and the concept of action-reaction force pairs.
• Identify examples of action-reaction forces in everyday situations.
• Explain how forces acting on different objects affect their motion and momentum.

Learning Objectives

• Understand the basic process of glycolysis
• Identify key molecules involved in glycolysis
• Recognize the differences in energy production under aerobic and anaerobic conditions

Learning Objectives

• Explain how matter cycles through ecosystems as producers, consumers, and decomposers transform nutrients and elements.
• Describe how organisms at different trophic levels exchange matter while maintaining conservation of matter.
• Use evidence from food webs and decomposition processes to predict where elements end up in soil and water.

Learning Objectives

• Explain how mutations can originate from errors during DNA copying.
• Describe how environmental factors such as radiation and chemicals can increase mutation rates.
• Distinguish between mutations that affect gene function/regulation and those that may have little phenotypic effect.+ Show more

Learning Objectives

• Interpret weather data patterns using variables such as temperature, humidity (dew point), wind, and pressure
• Explain how short-term weather variability differs from longer-term climate averages
• Use evidence from data trends to describe likely precipitation timing, cloud development, and storm intensity

Learning Objectives

• Explain how atomic number and mass number determine the identity and isotopes of elements
• Describe the roles of protons, neutrons, and electrons in atomic structure
• Use simple nucleus and electron-shell models to predict basic chemical behaviour+ Show more

Learning Objectives

• Identify common observable evidence that a chemical reaction has produced new substances.
• Explain how reaction evidence relates to rearrangement of atoms and changes in bonding.
• Differentiate chemical changes from physical changes using evidence such as color, temperature, gas, precipitate, and odor.

Learning Objectives

• Describe major energy sources that affect Earth systems, including solar radiation and geothermal heat flow.
• Explain how energy is transferred through conduction, convection, and radiation within the atmosphere and oceans.
• Connect energy gradients to atmospheric and ocean circulation, weathering, and tectonic processes.+ Show more

Learning Objectives

• Explain how heat transfer happens due to temperature differences between a system and its surroundings.
• Describe how work transfers energy through forces acting over a distance.
• Use energy-transfer language to distinguish what comes from or goes to the surroundings during physical and chemical changes.

Learning Objectives

• Explain how uncertainty and error arise in scientific measurement and why repeated results vary.
• Differentiate random uncertainty from systematic error and predict how each affects data.
• Use significant figures and uncertainty reporting to compare measurements fairly.

Learning Objectives

• Understand the genetic mechanisms such as mutations, chromosomal rearrangements, and recombination that generate heritable variation.
• Identify different sources of allelic diversity and how they affect phenotype and population genetics.
• Explain how molecular changes influence gene expression and protein function, leading to phenotypic variability.+ Show more

Learning Objectives

• Explain how impulse relates force and contact time to changes in momentum during collisions
• Predict how different force-time profiles affect the velocity change of an object
• Distinguish elastic and inelastic collisions using conservation of kinetic energy

Learning Objectives

• Understand how the cardiovascular and respiratory systems work together to maintain oxygen levels
• Identify the role of feedback mechanisms in homeostasis
• Explain how neural and endocrine responses coordinate during stress+ Show more

Learning Objectives

• Identify observable evidence that indicates a chemical reaction has formed new substances
• Explain how changes in atoms and bonding patterns connect to reaction evidence such as gas, precipitate, color, temperature, and odor
• Distinguish chemical changes from physical changes using evidence-based reasoning

Learning Objectives

• Explain how stellar mass affects the path of stellar evolution from formation through later stages.
• Describe how nuclear fusion processes change during a star’s main-sequence and post-main-sequence evolution.
• Interpret how Hertzsprung–Russell (H–R) diagrams, spectral classification, and supernova remnants provide evidence for evolution.

Learning Objectives

• Explain how organs are built from multiple tissue types to perform specific functions
• Describe how organ systems connect to support body processes such as gas exchange and nutrient transport
• Compare structural features of organs with how those structures help organisms function

Learning Objectives

• Identify the structure and function of mitochondria.
• Explain how mitochondria produce energy for the cell.
• Describe the internal features of mitochondria such as cristae.+ Show more

Learning Objectives

• Explain how energy flows one direction through food chains, including energy losses at each step.
• Describe how matter cycles through biological systems by rearranging atoms during photosynthesis and cellular respiration.
• Use trophic level ideas and biomass trends to interpret how organisms incorporate and redistribute energy and matter.

Learning Objectives

• Explain how bond breaking and bond forming relate to changes in potential energy during chemical reactions
• Distinguish endothermic and exothermic reactions using energy diagrams and temperature change
• Use enthalpy change (ΔH) to describe whether a reaction releases or absorbs energy

Learning Objectives

• Classify chemical reactions as synthesis, decomposition, single displacement, double displacement, and combustion based on reactant–product patterns.
• Predict typical products and observable outcomes for each major reaction type using particle and mass conservation ideas.
• Use reaction context (e.g., oxygen presence, ionic formulas, and reactant identities) to infer likely reaction pathways and environmental consequences.

Learning Objectives

• Understand how to represent and analyze temporally changing systems using time-series data.
• Identify the role of feedback loops, rates, and equilibrium concepts in dynamic systems.
• Interpret empirical data to discern transient versus steady-state behaviors.+ Show more

Learning Objectives

• Describe the processes involved in water and carbon cycles within Earth's systems.
• Explain how solar radiation and Earth's radiation balance influence climate and weather.
• Identify reservoirs and pathways of matter and energy in Earth's cycles.