What is the difference between speed and velocity? A. Speed is velocity with direction
B. Velocity is speed with direction.
C. Speed can never be constant, velocity can be constant.
D. Velocity can never be constant, speed can be constant.

How to solve 4 nh3(g) + 5 o2(g) > 4 no(g) + 6 h2o(g) in chemistry

Part of molten rock at mid-ocean ridges

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