Tobject]user: when copper combines with oxygen to form copper (ii) oxide, the charge of the copper ion is
a. cu1+.
c. cu3+.
b. cu2+.
d. cu4+.

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.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .