If a substance cannot be seperated physically or chemically, it is ?

Word equation for k(s) +h2o(l) yield koh (aq) + h2

Displacement is the slope of a velocity vs. time graph a. true b. false

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy