Explain the difference between weight and mass.

Why does a red shoe appear red in daylight

Why are the trends and exceptions to the trends in ionization energy observed?

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