Chapter 2: Measurements

Question 1

Accuracy

Answer 1

How reliable the measurements are

Question 2

Precision

Answer 2

how close the measurements are to each other

Question 3

Significant digits

Answer 3

indicates how precisely a measurement is made

Question 4

Exact Numbers

Answer 4

values for which there is uncertainty (no decimals or fractions)

Question 5

Dimensional Analysis (factor Lable Method)

Answer 5

whatever we do to the numbers we also do to the units

Question 6

Conversion factors

Answer 6

fractions that contain equal amounts of different units in both the numerator and the denominator

Question 7

Density

Answer 7

the mass of a substance per unit volume

Question 8

Density equation

Answer 8

d=m/v

Question 9

Law of Conservation of Mass

Answer 9

in chemical reactions, matter is neither created nor destroyed and the total amount stays the same

Question 10

Atomic Theory

Answer 10

elements are made of tiny particles (atoms), atoms of each element are unique, atoms can join together in whole numbers, and atoms are unchanged in chemical reactions.

Question 11

Transition Metals

Answer 11

harder, less reactive metals (iron, copper. gold etc)

Question 12

Lanthanide Metals

Answer 12

rare earth metals (inner transition metals)

Question 13

Rare Earth Metals

Answer 13

heavier, naturally occurring metals

Question 14

non-metals

Answer 14

elements that form the basis of life

Question 15

Metalloids

Answer 15

are semi-conductors, conduct electricity but not as well as metals

Question 16

Alkali Metals

Answer 16

soft metals that react violently in the presence of oxygen

Question 17

Alkaline Earth Metals

Answer 17

reactive, but less extreme as alkali metals, reacts slower with water

Question 18

rules for counting sig figs (+/-)

Answer 18

round the number to the least number of decimal places

Question 19

rules for counting sig figs (*&/)

Answer 19

round the answer to the least number of significant digets