7.PS1.2.2 Substances react chemically in characteristic ways. In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different properties from those of the reactants.
7.PS1.3 Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
7.PS1.3.1 Each pure substance has characteristics, physical and chemical properties (for any bulk quantity under given conditions), that can be used to identify it.
7.PS1.3.2 Substances react chemically in characteristic ways.
7.PS1.3.3 In a chemical process, the atoms that make up the original substances regroup into different molecules, and these new substances have different properties from those of the reactants.
7.PS1.3.4 Engineering advances have led to important discoveries in virtually every field of science, and scientific discoveries have led to the development of entire industries and engineered systems.
7.PS1.3.5 The uses of technologies and any limitations on their use are driven by individual or societal needs, desires, and values; by the findings of scientific research; and by differences in such factors as climate, natural resources, and economic conditions.
7.PS1.5 Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
7.PS1.5.1 Substances react chemically in characteristic ways.
7.PS1.6.2 A solution needs to be tested, and then modified on the basis of the test results, in order to improve it.
7.PS1.6.3 The iterative process of testing the most promising solutions and modifying what is proposed on the basis of the test results leads to greater refinement and ultimately to an optimal solution.
7.PS3.1 Construct and interpret graphical displays of data to describe the proportional relationships of kinetic energy to the mass of an object and to the speed of an object.
7.PS3.1.1 Motion energy is properly called kinetic energy; it is proportional to the mass of the moving object and grows with the square of its speed.
LS1 From Molecules to Organisms: Structure and Function
7.LS1.6 Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.
7.LS1.6.1 Plants, algae (including phytoplankton), and many microorganisms use the energy from light to make sugars (food) from carbon dioxide from the atmosphere and water through the process of photosynthesis, which also releases oxygen. These sugars can be used immediately or stored for growth or later use.
7.LS1.6.3 In this reaction, carbon dioxide and water combine to form carbon-based organic molecules and release oxygen.
7.LS1.7 Develop a model to describe how food molecules in plants and animals are broken down and rearranged through chemical reactions to form new molecules that support growth and/or release energy as matter moves through an organism.
7.LS1.7.1 Within an individual organism, food moves through a series of chemical reactions in which it is broken down and rearranged to form new molecules, to support growth, or release energy.
7.LS1.7.2 Cellular respiration in plants and animals involves chemical reactions with oxygen that release stored energy. In these processes, complex molecules containing carbon react with oxygen to produce carbon dioxide and other materials.
7.LS2.1.2 In any ecosystem, organisms and populations with similar requirements for food, water, oxygen, or other resources may compete with each other for limited resources, access to which consequently constrains their growth and reproduction.
7.LS2.1.3 Growth of organisms and population increases are limited by access to resources.
7.LS2.2 Construct an explanation that predicts patterns of interactions among organisms across multiple ecosystems.
7.LS2.2.1 Predatory interactions may reduce the number of organisms or eliminate whole populations of organisms. Mutually beneficial interactions, in contrast, may become so interdependent that each organism requires the other for survival. Although the species involved in these competitive, predatory, and mutually beneficial interactions vary across ecosystems, the patterns of interactions of organisms with their environments, both living and nonliving, are shared.
7.LS2.5.2 The completeness or integrity of an ecosystem's biodiversity is often used as a measure of its health.
7.LS2.5.3 Changes in biodiversity can influence humans' resources, such as food, energy, and medicines, as well as ecosystem services that humans rely on—for example, water purification and recycling.
7.LS2.5.4 There are systematic processes for evaluating solutions with respect to how well they meet the criteria and constraints of a problem.
ESS3 Earth and Human Activity
7.ESS3.1 Construct a scientific explanation based on evidence for how the uneven distributions of Earth's mineral, energy, and groundwater resources are the result of past and current geoscience processes.
7.ESS3.1.1 Humans depend on Earth's land, ocean, atmosphere, and biosphere for many different resources.
7.ESS3.1.3 These resources are distributed unevenly around the planet as a result of past geologic processes.
7.ESS3.3 Apply scientific principles to design a method for monitoring and minimizing human impact on the environment.
7.ESS3.3.1 Human activities have significantly altered the biosphere, sometimes damaging or destroying natural habitats and causing the extinction of other species. But changes to Earth's environments can have different impacts (negative and positive) for different living things.
7.ESS3.3.2 Typically, as human populations and per-capita consumption of natural resources increase, so do the negative impacts on Earth unless the activities and technologies involved are engineered otherwise.
7.ESS3.4 Construct an argument supported by evidence for how increases in human population and per-capita consumption of natural resources impact Earth's systems.
7.ESS3.4.1 Typically, as human populations and per-capita consumption of natural resources increase, so do the negative impacts on Earth unless the activities and technologies involved are engineered otherwise.
7.ESS3.5 Obtain, evaluate, and communicate evidence of the factors that have caused changes in global temperatures over the past century.
7.ESS3.5.1 Understanding atmospheric changes and reducing human vulnerability to whatever climate changes do occur depend on the understanding of climate science, engineering capabilities, and other kinds of knowledge (such as understanding of human behavior) and on applying that knowledge wisely in decisions and activities.