How many grams of water could be vaporized (boiled) with 4590 Joules of heat?

In which situation can a mixture always be called a solution

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas

What sources of error may have contributed to the percent yield not being 100 percent? think about things that may have led to inaccurate measurements or where mass of the product could have been lost if this experiment was conducted in a physical laboratory.