classifying
what is the difference between a heterogeneous and homogeneous mixture?
Heterogeneous mixtures: you can see the differences
name two physical properties of ice
solid, cold, clear
if an object has a mass of 20 and a volume of 25, what is the density?
.8
as we go from a solid to a liquid to a gas, what happens to the total energy?
increases
This phase has a definite shape and volume
solids
Water (H2O) is an element, compound, or mixture?
compound
if something is reactive what kind of property is that?
chemical
density: 2.3, .95, and 1.1: what will each one do?
sink, float, sink
liquid to solid?
freezing
this phase has a definite volume but cannot hold their shape
liquids
name three HETEROGENEOUS mixtures
chex mix, lucky charms, salsa
if I cut paper, is it a chemical or physical change?
physical
if an object has a density of .3, will it sink or float?
float
What do we call it when a solid turns directly to a gas?
sublimation
this phase has the most space between their molecules
gas
salt water is what kind of mixture?
homogeneous
name 2 out of the 4 ways we know a chemical change has occured
bubble, energy change, precipitate forms, color change
if an object has a density of 1.2 and a volume of 30, what is the mass and will that object sink or float?
mass is 36 and sink
gas into a liquid?
condensation
What is the fourth state of matter?
plasma
what are the two main ways to classify matter?
pure substance or mixture
If i burn a candle, how can that be both a chemical and physical change?
wick burns, wax melts
what is the definition of density?
the ratio of mass to volume
liquid to a gas
vaporization
which one has the highest energy?
gas