5. The formula unit of calcium sulfide is :
(1 Point)
OCa, S,
o Ca₂S
O Ca23
O Cas

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

What are the similarities of physical and chemical change ?

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?