Chapter 1 Terms

Question 1

atom

Answer 1

smallest particle of an element that can enter into a chemical combination

Question 2

accuracy

Answer 2

how closely a measurement aligns with a correct value

Question 3

chemical change

Answer 3

change producing a different kind of matter form the original kind of matter

Question 4

compound

Answer 4

pure substance that can be decomposed into two or more elements

Question 5

element

Answer 5

substance that is composed of a single type of atom (cannot be decomposed by a chemical change)

Question 6

extensive property

Answer 6

property of a substance that depends on the amount of the substance

Question 7

heterogeneous mixture

Answer 7

combination of substances with a composition that varies from point to point

Question 8

homogeneous mixture

Answer 8

combination of substances with a composition that is uniform throughout

Question 9

hypothesis

Answer 9

tentative explanation of observation that acts as a guide for gathering and checking information

Question 10

intensive property

Answer 10

property of a substance that is independent of the amount of substance

Question 11

law

Answer 11

summarize a vast number of experimental observations

Question 12

law of consvervation of matter

Answer 12

no detectable change in the total quantity of matter present, when matter converts from one type of matter to another

Question 13

mass

Answer 13

fundamental property indicating amount of matter

Question 14

matter

Answer 14

anything that occupies space and has mass

Question 15

mixture

Answer 15

matter that can be separated into its components by physical means

Question 16

molecule

Answer 16

bonded collection of two or more atoms of the same or different elements

Question 17

physical change

Answer 17

change in the state or properties of matter that does not involve a change in its chemical composition

Question 18

physical property

Answer 18

characteristic of matter that is not associated with any change in its chemical composition

Question 19

plasma

Answer 19

gaseous state of matter containing a large number of electrically charged atoms and/or molecules

Question 20

precision

Answer 20

how closely a measurement matches the same measurement when repeated

Question 21

pure substance

Answer 21

homogeneous substance that has a constant composition

Question 22

scientific method

Answer 22

path of discovery that leads from question and observation to law or hypothesis to theory,

Question 23

theory

Answer 23

well-substantiated, comprehensive, testable explanation of a particular aspect of nature

Question 24

uncertainty

Answer 24

estimate of amount by which measurement differs from true value