Question

snc2p chemistry
you should become very familiar with this table:

prefix	number	example (formula)
di	2	(co₂)
tri	3	(so₃)
tetra	4	(cf₄)
penta	5	(pbr₅)
hexa	6
hepta	7
octa	8
nona	9
deca	10

note: omit the prefix \mono\ from the ______ element in the compound

example:
co is carbon monoxide

note: some molecular compounds are more readily recognized by their ______ names.

examples:
h₂o is water
nh₃ is ammonia
o₃ is ozone
ch₄ is methane
h₂o₂ is hydrogen peroxide

Explanation:

Step1: Recall prefix - number relationships in chemistry

Prefixes are used to denote the number of atoms of an element in a molecular compound. Mono - 1, Di - 2, Tri - 3, Tetra - 4, Penta - 5, Hexa - 6, Hepta - 7, Octa - 8, Nona - 9, Deca - 10.

Step2: Fill in the table

For prefix "hexa", number is 6, example could be sulfur hexafluoride ($SF_6$). For "hepta", number is 7, example could be iodine heptafluoride ($IF_7$). For "octa", number is 8, example could be sulfur octafluoride ($SF_8$). For "nona", number is 9, example could be chlorine nonafluoride ($ClF_9$) (though less common). For "deca", number is 10, example could be decaborane ($B_{10}H_{14}$).

Step3: Complete the note blanks

Omit the prefix "mono" from the first element in the compound. Some molecular compounds are more readily recognized by their common names.

Step4: Fill in compound name examples

$H_2O$ is water, $NH_3$ is ammonia, $O_3$ is ozone, $CH_4$ is methane, $H_2O_2$ is hydrogen peroxide.

Answer:

Prefix	Number	Example (formula)
di	2	carbon dioxide ($CO_2$)
tri	3	sulfur trioxide ($SO_3$)
tetra	4	carbon tetrafluoride ($CF_4$)
penta	5	phosphorus pentabromide ($PBr_5$)
hexa	6	sulfur hexafluoride ($SF_6$)
hepta	7	iodine heptafluoride ($IF_7$)
octa	8	sulfur octafluoride ($SF_8$)
nona	9	chlorine nonafluoride ($ClF_9$)
deca	10	decaborane ($B_{10}H_{14}$)

Note: Omit the prefix "mono" from the first element in the compound

Example: CO is carbon monoxide

Note: Some molecular compounds are more readily recognized by their common names

Examples:
$H_2O$ is water
$NH_3$ is ammonia
$O_3$ is ozone
$CH_4$ is methane
$H_2O_2$ is hydrogen peroxide