Which of the following is a single replacement reaction?
2al + 6h2o yields 2al(oh)3 + 3h2
agno3 + nacl yields agcl + nano3
fe2o3 + 3h2o yields 2fe(oh)3
ch4 + 2o2 yields co2 + 2h2o

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.

What must be in balance for temperatures to remain constant?

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density