Chapter 1 Notes Flashcards
what is matter?
anything that has mass and takes up space.
what is Density?
mass over volume
physical property
observed and measured WITHOUT changing into another substance
examples of physical property
density, melting and boiling points.
Physical change
recognizable difference in the appearance
example of physical change
ice - water -steam
chemical property
observed through a chance in composition
examples of chemical property
toxicity, flammability, reactivity w/ oxygen, enthalpy of formation.
intensive property
independent of quantity (the amount of substance we are measuring)
extensive property
dependent of quantity (measuring the mass and volume & the value will depend how much substance you have)
what is an element
cannot be reduced or simplified and still exit the same properties and characteristics
what is a compound?
two or more elements defined as a ratio
what are compounds held by?
chemical bonds
what are the types of chemical bonds?
ionic and covalent bonds
neutral atom or molecule
can be present as neutral or ions
what kind of charge does neutral molecules have
no charge
what kind of charge ions does have?
negative or postive charge
how do ions become positive or negative charge?
the loss or gain of electrons
What is chemical reaction?
conversion of one or more substance into one or more different substance
Also occurs at the level of the valence electrons
what is a pure substance
element or compound
mixture
homogenous and heterogeneous
Homogenous mixture
same no matter where in mixture (completely mixed)
heterogeneous mixture
difference in substance (Not completely mixed
What is a solid?
particles very close defintie volume and shape
