Which of the following element(s) are more likely to combine with lead to form an ionic substance? I. Potassium

II. Bromine

III. Oxygen

IV. Manganese

A. I and II
B. II only
C. II and III
D. IV only

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.