Ch 1 Vocabulary
the study of the composition, structure, and properties of matter, the processes that matter undergoes and the energy changes that accompany these processes
Chemistry
a testable statement that is predictive and testable
Hypothesis
How many significant figures are in the number 204?
3
Burning paper is what kind of change?
Chemical
a relationship when two variable both decrease or increase together
direct relationship
the smallest unit of an element that maintains the chemical identity of that element
Atom
an agreed upon measurement system used by scientists
SI System
How many significant figures are in the number 21000?
2
color is an example of what kind of property?
intensive property
observations involve a number and unit
quantitative
substances that react in a chemical reaction
reactant
a ration of mass to volume
density
Solve:
2.005 + 5.1
7.1
vertical columns on the periodic table
groups or families
Convert 504 cm to m
5.04 m
a state of matter that is a gas with charged particles
Plasma
the closeness of measurements to the correct or accepted of the quantity measured
Accuracy
Solve:
12.01 - 6.5
5.5
A mixture that is uniform through out
heterogenous mixture
the idea that an experiment can reproduced by other scientists.
replication
element that has some characteristics of both metals and nonmetals
metalloid
refers to the closeness of a set of measurements of the same quantity made in the same way
Precision
4.25 x 2.345
9.97
Name a method to separate a mixture
filtration, centrifugation, decanting, paper chromatography
Calculate the density of a substance that has a mass of 4.5 g and a volume of 1.6 ㎤?
1.8 g/㎤