crystals that are considered more valuable than others

(a)  

molecules that are arranged in long chains of many repeating small molecules

(a)  

great polymers that are light, strong, and easily recyclable

(a)  

tastes sour, conducts electricity, ruins metal, and donates hydrogen ions

(a)  

the chemical opposite of an acid

(a)  

when two or more chemical substances interact with each other and change into different chemical substances

(a)  

does not change the molecules; only changes the way things look

(a)  

the substances you start with in a chemical reaction

(a)  

a substance that speeds up a chemical reaction without being used up in the process

(a)