Chapter 0 Reference

Question 0

What are the most common power of ten prefixes?

Answer 0

nano- 10^-9            symbol n
micro-10^-6            symbol u
milli-   10^-3            symbol m
centi- 10^-2            symbol c 
kilo-    10^3             symbol k
mega- 10^6            symbol M

Question 1

What are the six base units and what do they measure?

Answer 1

Meter - length
Kilogram- mass
Second- time
Mole- amount of substance
Kelvin- temperature
Ampere- electric current

Question 2

Liter

Answer 2

1/1000 of cubic meter

Question 3

Define Å

Answer 3

Unit of length equal to 10^-10

Question 4

Density formula

Answer 4

Mass
_________
Volume

Question 5

Density units of measure

Answer 5

Kg/m^3

Question 6

Molecular formula

Answer 6

Gives the identities and numbers of atoms in a molecule.

Question 7

Molecule

Answer 7

Two or more molecules form a covalent bond

Question 8

Formula weight

Answer 8

Sum of the atomic weights of all the atoms in the molecule

Question 9

Atomic mass unit (amu)

Answer 9

Atomic weight

Question 10

What is the molecular weight of calcium phosphate(Ca3(PO4)2)?

Answer 10

310 g/mol

Question 11

Mole

Answer 11

Particular number of atoms

Question 12

Avogadro’s number

Answer 12

6.022x10^23

Question 13

Formula for moles

Answer 13

moles = mass in grams/ molecular weight

Question 14

Empirical formula

Answer 14

Smallest whole number that give the same ratio

Question 15

What is the empirical formula for C6H12O6?

Answer 15

CH2O

Question 16

Percent composition of C4H4N2

Answer 16

Step 1: find the empirical formula
Step 2: find molecular weight or formula weight
Step 3: divide each atom total atomic mass by the molecular or formula weight