Ch 18-

Question 1

Scientific method

Answer 1

Question
Hypothesis
Experiment
Observation
Analysis
Conclusion

Question 2

Hypothesis

Answer 2

Testable
Dependent and independent variables
Concise
Educated testable prediction about what will happen

Question 3

Reliability

Answer 3

Measure of consistency of scores over time

Question 4

Validity
Internal
External
Ecological

Answer 4

Internal cause effect relationship
Results applicable to people outside experiment
Results have meaning to real live of others

Question 5

Accuracy
Precision

Answer 5

How close u are to the true value
Average is close to true value

How much your measurements vary when measured over and over
Low range

Question 6

History of chemistry
Ancient
Middle Ages
17th 18th century
19th
20th

Answer 6

Alchemist practices
Distillation filtration = substance discover
Foundation chemical reactions
Periodic table and atomic theory
Molecular structure/quantum theory

Question 7

Metric system

Answer 7

Cm
M
Kg
G
L
Km

Question 8

Percent error =

Answer 8

(Measurement - true value) / true value x100%

Question 9

Qualitative data vs
Quantitative data

Answer 9

Paint, colors, thick or thin brush strokes, type of painting

Vs

Cost, size, weight

Question 10

H2SO4

Answer 10

Sulfuric acid
Strong acid

Question 11

H3SO3

Answer 11

Sulfurous acid
Weak acid

Question 12

Wavelengths

Answer 12

Shorter wavelength = more energy

Question 13

PO4 2-

Answer 13

Phosphate