Which type of reaction always has an element and a compound as reactants? Group of answer choices

A. decomposition

B. single-replacement

C. double-replacement

Complete this brønsted-lowry reaction placing each product by its appropriate label. hso4- + hcn

What material does not melt at any temperature

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.