10g of marble was added to 15 grams of dilute hydrochloric acid, product formed is calcium chloride, water and carbon dioxide. which of the following is true?

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

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

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?