Chapter 2 Key Terms

Question 1

Law of Conservation of Mass

Answer 1

Mass is never created or destroyed

Question 2

Law of Definite Proportions

Answer 2

All molecules have the same amount of their constituent parts

Question 3

Law of Multiple Proportions

Answer 3

Molecules containing a specific element always combine in amounts that are small while number ratios (multiples of that atom)

Question 4

Cathode Rays

Answer 4

Electrically charged beams of electrons

Question 5

Cathode Ray Tubes

Answer 5

Tubes which held cathode rays, and had an electrode on each end

Question 6

Nuclear Theory

Answer 6

Most of atom’s mass, positive charge is in a dense small core called the nucleus, surrounded by a low mass field of negatively charged electrons

Question 7

Atomic Mass Unit (AMU)

Answer 7

1/12th mass of C-12, average mass of one proton or neutron

Question 8

Periodic Law

Answer 8

When the elements are arranged in order of increasing mass, certain sets of properties recur periodically

Question 9

Metal

Answer 9

Elements on the left side of the periodic table. They are good conductors, malleable, ductile, shiny, and mostly they lose electrons when they react

Question 10

Metalloids

Answer 10

Mixed properties of metals and nonmetals. Include: B, Si, Ge, As, Sb, Te, At

Question 11

Nonmetals

Answer 11

Poor conductors who gain electrons in reactions

Question 12

Semiconductor

Answer 12

Elements with highly variable, often temperature dependent, electrical conduction

Question 13

Family

Answer 13

Group on periodic table

Question 14

Mass Spectrometery

Answer 14

Separation of elements by mass so that they can be studied or the composition of a substance can be found