Introduction to Chemistry Test Flashcards
(26 cards)
Define Chemistry
The study of interactions of matter with other matter and with energy
-changes of matter +energy involved in chemistry
Observation
the act of using senses or insterments to gather information about the natural world
ex: the dark colors sank
Inference
ex: food coloring was an indicator to how the soap reacts
Physical properties ex:
luster, density, color, hardness, melting point, boiling point
Chemical properties ex:
flammability, reacts with acid
Physical change ex:
mixture, cutting, phase change, dissolving
Chemical change ex:
fire, cook, rotting, digesting
Chemical change indicators
color change, spontaneous in temp, formation of bubbles or precipitate(insoluble solid)
Phase Changes
sublimation (solid to gas), decomposition (gas to solid), freezing, melting, vaporization, condensation
What holds two atoms together
chemical bond
What can a particle be
a single atom or molecule
small subscript on the code
how many atoms of a type in a moloclue
Pure Substance
TSq2R, R, Sq2, SqR3
CO2
compound
Al
element
elements are made of
atoms
a compound is made of
molecules
Another word for homogeneous is
solution
pure substances are made of
compound and elements
metals ex:
lustrous, good heat conductors, high melting point, high density, malleable
non metal ex:
not lustrous, poor heat conductor, brittle solids,
theory def
broad and has experiments
fact def
observation that is observered over and over
hypothesis ex:
If, then.. you can make it testable
