What does a student learn in StateMissouri,GradeGrade 9,SubjectScience?

The periodic table is arranged so that elements in the same column behave similarly. Students use that pattern to predict how reactive or stable an element is based on how many electrons sit in its outermost shell.

Students figure out what new substances a chemical reaction will produce by looking at how atoms bond using their outer electrons and patterns in the periodic table.

Students design and run an experiment comparing how substances behave when heated, cooled, or mixed, then use those results to figure out how strongly the tiny particles inside each substance are holding onto each other.

Students learn why metals bend, ceramics shatter, and plastics stretch by looking at how atoms bond and arrange themselves inside each material. The internal structure explains the outside behavior.

Chemical reactions break old bonds and form new ones. When the new bonds store less energy than the old ones did, the leftover energy releases as heat or light. Students model how that energy difference explains why some reactions warm up their surroundings and others cool them down.

Changing the temperature or concentration of chemicals changes how fast a reaction happens. Students explain why, using evidence, such as how heating particles makes them collide more often and with more force.

Students adjust conditions like temperature or pressure in a chemical reaction to shift how much product forms. This is the practical side of chemical equilibrium: knowing which lever to pull to get more of what you want.

Students use chemical equations and math to show that the total mass of materials before and after a reaction stays the same. No atoms appear or disappear; they just rearrange into new substances.

Nuclear reactions split or fuse atoms to release energy. Students learn how these reactions differ from ordinary chemical reactions and why they produce so much more energy.

Nuclear equations show what happens inside an atom's nucleus during fission, fusion, and radioactive decay. Students use symbols and numbers to track how the nucleus changes and how much energy each reaction releases.

Students look at motion data (speed, mass, push or pull) to confirm that heavier objects need more force to reach the same acceleration as lighter ones. This is the math behind Newton's second law: force equals mass times acceleration.

Students use math to show that when two objects collide or push off each other, the total momentum before and after stays the same, as long as nothing outside the system is pushing or pulling on them.

Students design and test a device that cushions an object during a crash. Using what they know about motion and momentum, they adjust the design until the impact force is as low as possible.

Students use Newton's formula to calculate how gravity pulls two objects toward each other. The heavier the objects and the closer they are, the stronger the pull.

Students run experiments to show that electricity flowing through a wire creates a magnetic field, and that moving a magnet near a wire can push electricity through it. These two ideas are the foundation of how motors and generators work.

Students build a simple program or spreadsheet that tracks energy moving between parts of a system, like heat leaving one object and entering another, to calculate how much energy each part gained or lost.

Macroscopic energy, like a rolling ball or a stretched spring, breaks down into two parts: the energy of moving particles and the energy stored by their positions. Students build models to show how those two parts add up to the total.

Students design and build a working device that turns one form of energy into another, like converting motion into electricity or heat into light, then adjust the design until it meets a specific set of requirements.

Students plan and run an experiment to show that when a hot object and a cold object are placed together in a sealed container, heat moves from the hotter one to the cooler one until both reach the same temperature.

Students draw or diagram two objects that push or pull each other through electric or magnetic fields, then trace how the energy of each object changes as the force between them grows stronger or weaker.

Students use math to show how a wave's frequency, wavelength, and speed are connected, and how those relationships change when the wave moves through different materials, like air, water, or glass.

Light can act like a wave or like a tiny particle depending on what it's doing. Students learn to weigh the evidence for each idea and decide which picture of light makes more sense for a given situation.

Light, radio waves, X-rays, and microwaves are all forms of electromagnetic radiation. Students learn how these waves carry energy across space and how technologies like cameras, phones, and medical scanners use them.

Students explain how light and other electromagnetic waves behave when they hit different materials, such as being absorbed, reflected, or passed through. This shows up in everyday technology like sunscreen, mirrors, and fiber-optic cables.

Students read science articles or studies and judge whether the evidence actually supports the claim about how radio waves, visible light, X-rays, or other electromagnetic radiation affect the material absorbing them.

DNA holds the instructions for building proteins, and proteins run nearly every process in the body. Students model how the sequence of bases in DNA gets read and converted into a specific protein.

The body is organized in layers: cells group into tissues, tissues form organs, and organs work together in systems like digestion or circulation. Students model how each layer depends on the others to keep the organism alive.

Students design and run an experiment to show how the body keeps conditions stable, like how heart rate or body temperature returns to normal after exercise.

Mitosis is how the body copies and replaces cells. Students model how cell division produces the trillions of specialized cells that make up skin, muscle, nerves, and every other tissue in the body.

Students build or interpret a model showing how plants capture sunlight and convert it into sugar stored in their cells.

Cellular respiration is how cells break apart food molecules and rebuild them into new compounds, releasing energy the body can use. Students model this chemical process to show where the energy comes from and where it goes.

Living things are built from large molecules made mostly of carbon, hydrogen, and oxygen. Students learn to build and refine an explanation, using evidence, for why nitrogen, sulfur, and phosphorus also show up in the proteins and DNA that make life work.

Students use data and simple math to explain why an ecosystem can only support so many living things. Factors like temperature, rainfall, and food supply set that limit, and shifts in any of them change which species survive.

Plants, algae, and some bacteria convert sunlight or chemicals into usable energy, while all living things release that energy through respiration. These processes keep carbon, oxygen, and other materials cycling through an ecosystem, but only where conditions allow each reaction to happen.

Energy moves through an ecosystem in one direction, from plants to herbivores to predators, while matter like carbon and nitrogen cycles back through the same organisms. Students trace how food chains show both of those patterns at once.

Students trace how carbon moves through living things, air, water, and soil by mapping what happens during photosynthesis, respiration, decomposition, and burning. The goal is explaining why carbon never disappears, it just changes form and location.

When conditions in an ecosystem stay stable, animal and plant populations tend to hold steady. Students look at real evidence to judge whether that claim holds up, and to explain what happens to those populations when conditions shift.

Students look at a real environmental problem and design or improve a solution that protects local species and habitats. The focus is on making a measurable difference, not just identifying the issue.

During sexual reproduction, chromosomes carrying DNA get shuffled and split during meiosis, then combine again at fertilization. Students model how this process moves genetic information from two parents to their offspring.

Asexual reproduction copies one parent's genetic information exactly, so offspring look nearly identical. Sexual reproduction mixes genetic information from two parents, which is why siblings can look so different from each other.

A mutation is a change in the DNA instructions inside a cell. Students model how that change can alter the protein a gene builds, and explain why the result might harm the organism, help it survive better, or make no difference at all.

Students argue, with evidence, that genetic variation comes from two main sources: the reshuffling of genes during reproduction, and mutations that arise during cell copying or from environmental exposure.

Students use probability and simple data analysis to explain why traits like eye color or height vary across a population. They look at patterns across many individuals, not just one family, to see how often certain traits appear.

Students explain why scientists are confident that life on Earth shares common ancestors. They point to evidence from fossils, DNA, body structures, and the geographic spread of species, showing how each line of evidence points to the same conclusion.

Students compare drawings or photos of animal embryos at different stages of development to spot similarities across species. Those shared early features reveal evolutionary relationships that fully grown animals no longer show.

Evolution explains why species change over time. Students use evidence to show how four forces drive it: populations grow fast, individuals inherit different traits, resources run short, and the individuals best suited to their environment survive and have more offspring.

Students use basic probability and data to explain why a helpful inherited trait spreads through a population over generations. If a trait helps an organism survive and reproduce, more of its offspring carry that trait over time.

Natural selection is evolution in action: the individuals best suited to their environment survive and reproduce, so helpful traits gradually spread through a population over generations. Students build an argument using real fossil, genetic, or observational evidence to explain how this process shapes species over time.

When the environment shifts, some species thrive, some slowly change into new ones, and others die out entirely. Students look at real evidence and decide how well it supports each of those outcomes.

Students build or update a model to test whether a proposed fix actually reduces the harm human activity causes to local species and ecosystems.

Students build a model showing how the Sun produces energy by fusing hydrogen atoms together in its core. That process explains how the Sun has burned for billions of years and how its light and heat reach Earth.

Students use light patterns from distant stars and the movement of galaxies to explain how the universe began with the Big Bang. The evidence comes from real telescope observations, not just textbook claims.

Stars act like element factories. Over billions of years, they fuse hydrogen and helium into heavier elements, and when they explode or die, those elements scatter into space and eventually become part of planets, rocks, and living things.

Students use a math rule discovered by Johannes Kepler to predict how fast a planet or moon moves along its orbit and how long its trip around the sun takes.

Students compare the ages of ocean-floor rocks and continental rocks, then use plate tectonics to explain why. Oceanic crust sinks back into the Earth at plate boundaries and gets replaced; continental crust stays on the surface far longer.

Students use rock samples, meteorites, and the surfaces of other planets as evidence to piece together how Earth formed and what its earliest history looked like.

Students build a diagram or model showing how volcanoes, earthquakes, and erosion slowly shape continents and the ocean floor. Some changes take seconds; others take millions of years.

Reading real Earth data, students explain how one change on the surface, like a volcanic eruption or a flood, sets off changes in the atmosphere, ocean, or living things nearby.

Students build a model showing how heat from Earth's core drives slow loops of melted rock through the mantle. Those loops move material from deep inside Earth toward the surface and back down again.

Students use diagrams or simulations to show how changes in the energy entering or leaving Earth, such as more sunlight absorbed or more heat trapped, shift the climate over time.

Students design and run experiments to see how water shapes the ground around us, testing how it moves, soaks into soil, or wears down rock and other Earth materials.

Students build a model using real numbers to track how carbon moves between the ocean, air, rocks, and living things. The goal is to show how much carbon shifts between each part of Earth's system and why that movement matters.

Students build a written argument, using fossil and rock evidence, explaining how Earth's oceans, atmosphere, and land shaped living things over time while living things changed Earth in return.

Students look at real evidence, such as maps, data, and historical records, to explain how resource supplies, natural disasters, and shifting weather patterns have shaped where and how people live and work.

Students compare real proposals for mining or energy production, weighing what each option costs society, the environment, and local economies against what it delivers. The goal is to judge which solution makes the most sense given all three kinds of trade-offs.

Students build a computer simulation that shows how choices about natural resources, like water or land use, affect both human populations and the variety of species that share those resources.

Students look at a real-world design (a wetland filter, a wildlife corridor, a runoff barrier) and judge whether it actually reduces the damage humans caused. They may also suggest improvements to help the ecosystem recover and stay stable.

Students study real temperature records, ice core samples, and climate model outputs to predict how fast the climate is changing and what that means for sea levels, weather patterns, and ecosystems.

Students look at real examples of how farming, building, or burning fuel shifts the balance between land, water, and air, then predict what happens next. The effects can go either way, harmful or helpful.

Students pick a real-world problem (like clean water access or food waste) and spell out exactly what a good solution must do and what limits it must work within, using both numbers and plain descriptions.

Students take a messy real-world problem, like reducing food waste or improving water flow, and split it into smaller parts that are each solvable. Then they design solutions for each part.

Students pick the best solution to a real problem by weighing what matters most: cost, safety, how well it holds up, and how it affects people and the environment. Not every solution is perfect, so students explain which trade-offs are worth making.

Students run a computer simulation to test how a proposed solution to a real-world problem holds up when multiple requirements and trade-offs are in play. The simulation shows how changes in one part of a system ripple through the rest.