STATION 1 Understanding the Periodic Table
If an atom of Oxygen has an atomic
number of 8 that means-
E. there are 6 protons.
F. there are 8 neutrons.
G. it weighs 8 amu
H. it is in group 8.

Which statement justifies that phosphine (ph3) is a polar molecule?

Calculate the change in entropy if br2(l) is converted into gaseous br atoms. s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

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