Chapter 21 Flashcards
Anything that has made and occupies space.
Matter
Deals with how the natural world operates.
Basic research
Develops applications for basic research.
Applied research
The smallest unit of an element that can exist independently.
Atom
A group of atoms bonded together. H20- 1 oxygen atom, 2 hydrogen atoms.
Molecule
Atoms are arranged in a fixed position.
Solids
Atoms can move past each other.
Liquids
The study of matter and the transformations it can undergo.
Chemistry
Atoms can move freely in all directions.
Gases
Observable characteristics of a substance. (Color, texture, phase)
Physical properties
A substance changed its phase or properties but not its chemical composition.
Physical change
Describes how one substance interacts with another and created a new substance.
Chemical properties
Involves the rearrangement of a substance atoms creating a new substance with different properties.
Chemical change
The attraction between two or more atoms that holds them together in a molecule.
Chemical bond
The process In which atoms are rearranged to create a new substance.
Chemical reaction
Shows how many individual atoms are bound together in an elements pure form.
Elemental formula
Created when atoms of different substances are bonded together to create a new substance. (Water, NaCl)
Compound
A method used to show the number and types of atoms present in a substance. (Co2)
Chemical formula
Shows the number of atoms in the chemical formula. (H20, 1 atom of o, 2 atoms of h)
Subscript number
A summary of a chemical change.
Chemical equation
Substance that exists before a chemical change. Located on the left of the chemical equation.
Reactants
Substance that exists after the chemical change. Locating on the right of a chemical equation.
Products
Matter is neither created nor destroyed during a chemical reaction.
Law of mass conservation
