Problems
1. painters and carpenters use scaffolding to climb buildings from the outside. what
shapes do you see? why does one figure have more right angles?
select all true statements based on the
diagram.

What is the mass of 4 molecules of co2

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

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.