Which of the following is incorest regarding monosaccharides? b) smallest monosaccharides are composed of three carbons. d) must be either ether or ester a) aldoses and ketoses c) exist in many isomeric forms e) two monosaccharides can combine to form a disaccharide

Must be either ether or ester.

Explanation:

The incorrect statement is that the monosaccharides must ether or esters.

The main and compulsory functional group in a monosaccharide are aldehyde and ketones.

The other statements are true

1) smallest monosaccharides are composed of three carbons: the smallest monosaccharide is glyceraldehyde.

a) aldoses and ketoses : they have either aldehyde group or ketone group

example: glucose is aldose and fructose if keotse

c) exist in many isomeric forms: there can be many arrangement on chiral carbons thus many stereoisomers are possible

e) Two monosaccharides can combine to form a disaccharide: yes for example glucose combines with fructose to give sucrose.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.