People
First people to suggest the existence of atoms
What is the Greek philosopher Democritus
The three states of matter
What is solid, liquid, gas
(3.8 X 103) x (5.0 X 10-3)
What is (1.9 X 101)
9.000 and why
What is 4 significant figures. Rule 4 states that zeros at the end of a number and the right of a decimal point are always significant
Atom
Ideas were based on observations of matter
What is Democritus
Physical changes can be classified as
What is reversible or irreversible
(2.2 X 106) / 4.2
What is (5.2 X 105)
24.7
What is 3 significant figures
Density
What is the ratio of the mass to the volume of an object.
A scientist who studied bacteria and formed an explanation that the mold had a chemical that stopped the bacteria from growing.
What is Alexander Fleming
A mixture that has a composition that is not uniform
What is heterogeneous mixture
(4.5 X 104) + (6.72 X 105)
What is (7.17 X 105)
10 cookies
What is unlimited number of significant figures
Distillation
What is a process that separates a liquid from a mixture by boiling
The person who did work in the late 1700s and changed chemistry forever.
What is Antoine- Laurent Lavoisier
A mixture that has uniform composition
What is homogeneous mixture
(8.3 X 10-3) - (9.0 X 10-4)
What is (7.4 X 10-3)
7003 meters and why
What is the closeness of a measurement to the true value of what is being measured
An English chemist and school teacher, years of life 1766-1844
Who is John Dalton
The steps for solving numeric problems
What is analyze, calculate, and evaluate
(1.28 X 106) + (4.00 X 105)
What is (1.68 X 106)
Two situations in which a number has an unlimited number of significant figures.
What is
1. Counted numbers (23 people in class)
2. Exact defined quantities (60 min=1 hr)
Filtration
What is a process that separates a solid from a liquid in a heterogeneous mixture