A tiny plant is placed in a sealed jar that contains moisture and plant food. The jar is allowed to sit in the sun. After a few days, the plant has grown a few inches taller. Will the mass of the sealed jar
(with its contents) increase, decrease, or stay the same over the course of the two days. Explain.

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