Calcium reacts with oxygen gas via the following balanced equation. $$\ce{2Ca(s) + O_{2}(g) -> 2CaO(s)}$$ How many grams of calcium oxide can be produced from 13.0 grams of calcium react?

Provide the chemical formula for the following polyatomic ions: ammonium chromate acetate nitrate

When calculating the effective area under two-way eccentricity, if the ratio 1/6 < eL/L < 0.5 and 0 < eB/B < 1/6 what is the formula for A′?  

In Meyerhoff’s two-way eccentricity case, if the ratio eL/L is greater than or equal to 1/6, the effective area A′ is calculated as A′=1/2B′L′.

What is the purpose of determining the effective width B′ and effective length L′ of a foundation under an eccentric load?  

The shape factors Fcs, Fqs, Fγs, ​ are calculated using the original dimensions of the foundation, B and L, rather than the effective dimensions B′ and L′.

On the AP exam, there are 60 multiple choice questions, and regular timing is 70 minutes on the multiple choice portion. 

The FRQ portion has 3 questions–two short and one long, and all 3 questions are to be completed in 60 minutes with regular timing. 

What is the layer indicated by the pointer? Answer is one word, no capitalization.

Charles Darwin’s voyage aboard the HMS Beagle was an important event in the field of biology