# Science Curriculum – Grade 7

## Physical Properties and Changes

• changes in particle motion, temperature, and phase (state) change
• density is a property of matter
• mixtures are combinations of substances.
• fields exist between objects exerting forces on each other even though the objects are not in contact.

## Chemical properties and Changes

• atomic composition of simple molecules
• synthetic materials come from natural resources and impact society.
• determine if a chemical reaction has occurred.
• number of atoms does not change in a chemical reaction

## Forces and Motion

• apply Newton’s Laws in various investigations and applications
• gravitational interactions between objects with different masses

## Energy

• electric and magnetic forces.
• relationships between the kinetic energy and the mass of an object as it relates to the speed of an object.
• objects interacting at different distances changes, different amounts of potential energy are stored in the system.
• design, construct, and test a device that either minimizes or maximizes thermal energy transfer
• when work is done on or by a system, the energy of the system changes as energy is transferred to or from the system.
• energy can be transferred by electric currents.
• use mathematical representations to describe waves that include frequency, wavelength, and how the amplitude of a wave is related to the energy in a wave.
• waves are reflected, absorbed, or transmitted through various materials

## Engineering Design

• Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.
• Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.
• Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.
• Develop a model to generate data for iterative testing and modification of a proposed object, tool, or process such that an optimal design can be achieved.
• Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy during a chemical and/or physical process.