A chemist is about to perform a titration by adding a base to an acid. What is the most important reason for using a base instead of water to rinse out the burette? to make sure the burette is not blocked to prevent any bacteria from growing in the burette to make sure the base will flow quickly though the burette to prevent dilution of the base, which may affect the results.

In 2002, the rare earth elements mine in mountain pass, california was closed because

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.