Question

pet imaging follows the emission of
a positrons.
b electrons.
c neutrons.
d protons.

question 44

table sugar breaking down into glucose and fructose is a(n) ______ reaction.

a synthesis
b hydrolysis
c acid - base
d exchange reaction

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Explanation:

First Question (PET Imaging)

PET (Positron Emission Tomography) imaging relies on the emission of positrons from radioactive tracers. Positrons are emitted during the decay of certain isotopes used in PET scans, which then interact with electrons to produce gamma rays detected by the scanner. Electrons, neutrons, and protons are not the primary emissions in PET imaging.

Table sugar (sucrose) is a disaccharide. Hydrolysis reactions involve the breakdown of a compound by the addition of water. Sucrose breaks down into glucose and fructose (monosaccharides) through hydrolysis (using water to split the molecule). Synthesis reactions build larger molecules, acid - base reactions involve proton transfer, and exchange reactions involve swapping ions, none of which fit the breakdown of sucrose into its monosaccharide components.

Answer:

A. positrons.

Question 44 (Table Sugar Reaction)