Propose a heat pack recipe. Include the mass of salt (g), the volume of water (mL), and the target temperature change (℃).

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

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

The fact that the total amount of energy in a system remains constant is a(n)