Write the chemical symbols for three different atoms or atomic cations with 11 electrons.

Evaluate this exponential expression,8. (2 + 3)2 – 42

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.