What kind of reaction is shown below? C8H18 → C2H4 + C6H14
a combustion
b double replacement
c composition
d decomposition
e single replacement

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.