SEPUP Chemical Reactions Unit
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28 Terms
Atom
The basic building block of matter.
Chemical Change (chemical reaction)
A process during which a substance or substances change into one or more new substances as a result of a change in the arrangements of atoms in molecules.
Closed System
A system that does not allow matter or energy to enter or escape.
Compound
A substance made from more than one element joined by a chemical bond.
Conserved
Saved; neither gained or lost.
Constraints
In engineering design, something that limits the solution to a problem.
Criteria
In engineering design, the goals and the desired features of the solution.
Element
The simplest pure substances, made of just one type of atom.
Endothermic
A process that absorbs energy (get cold).
Engineer
Someone who uses science and tools to build a product that solves a practical problem.
Engineer Design Process
A series of steps that engineers follow to come up with a solution to a problem.
Exothermic
A process that releases energy (get hot).
Mass
The amount of matter in an object.
Molecule
Two or more atoms held together by chemical bonds.
Open System
A system that allows reactants and products to escape or be added to the system.
Physical Change
A change in a substance that does not involve a change in the identity of the substance.
Precipitate
An insoluble solid formed when two liquid solutions are mixed, or to form an insoluble solid when two liquid solutions are mixed.
Products
The substances produced by the reactants; that is, the final substances present at the end of the reaction.
Prototype
An early sample of a product that provides information about how the device or system works.
Reactant
A chemical substance that enters into a reaction; the original substances present before a reaction takes place.
Thermal Energy
The total energy of motion of the particles in a sample of the substance.
Circuit Board
A thin plate or board that contains electronic components.
Etch
A chemical process that cuts into a solid surface.
Dissolve
To mix into liquid.
Physical State
The physical form of matter.
Chemical Equation
A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.
Conservation of Mass
The principle that mass is neither created nor destroyed during a chemical reaction.
Reclaim
To recover waste material so it can be used again.