What is always true of a combustion reaction? oxygen gas must be one of the reactants carbon monoxide will be produced the reaction absorbs energy one reactant must contain chlorine

How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?

Floor 19 is an isotope of fluorine it has different number a. electrons b. protons c. neutrons d.electron shells

Which quote from the passage best illustrates della’s optimism? “…and at length she was able to look up with dim eyes and a smile and say: "my hair grows so fast, jim! ” “…her heart had simply craved and yearned over them without the least hope of possession.” “and now, they were hers, but the tresses that should have adorned the coveted adornments were gone.” “beautiful combs, pure tortoise shell, with jewelled rims--just the shade to wear in the beautiful vanished hair.”d, ardent, most likely means? gloomy calm passionate innocent