Chapter 2

Question 1

Pure Substances

Answer 1

composed of 1 type of particle

Question 2

Mixture

Answer 2

composed of 2+ types of particles

Question 3

Homogenous mixture (solution)

Answer 3

mixture of 2+ substances
uniform throughout
ex: water, sugar

Question 4

Heterogenous mixture

Answer 4

mixture throughout the solution
non-uniform
ex: ice cubes in drink, sand and water, salt and oil

Question 5

Quantitative properties

Answer 5

measuring/quantifying something

Question 6

Qualitative properties

Answer 6

noting or describing how a process happens

Question 7

Intensive properties

Answer 7

independent on the amount of substance
ex: density, melting pt., boiling pt.

Question 8

Extensive properties

Answer 8

dependent on amount of substances
not used to identify matter
ex: mass, volume

Question 9

Physical properties

Answer 9

not changing composition
odor, taste, color, appearance, melting pt., boiling pt., density

Question 10

Chemical properties

Answer 10

displayed only by changing composition
corrosiveness
flammability, toxicity, temperature, color change

Question 11

Physical changes

Answer 11

alter only state or appearance, NOT composition or identity

Question 12

Chemical changes

Answer 12

atoms rearrange
transforming original into different substances

Question 13

Precision

Answer 13

how close a series of measurements are to one another
how reproducible measurements are

Question 14

Accuracy

Answer 14

how close measured value is to actual valued

Question 15

scientific method

Answer 15

observation/question, research topic area, hypothesis, test w/ experiment, analyze data, report conclusions