A scientist conducts an experiment to determine the safety of a potentially toxic substance that has been used in the production of children's toys. Why is evaluation of the experiment procedures important? A. Because other scientists will want to prove the conclusion incorrect.

B. Because an inaccurate or unreliable experiment design can result in incorrect conclusions.

C. Because the companies producing the toys want to make money

In order to calculate the amount of heat transferred you must know the __ and specific heat of the material, as well as the change in temperature. a. volume b. density c. mass d. enthalpy

Is a pencil falling to the floor anon contact force, a force, or a contact force

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)