Mass and mucentration data
sara's friend mike also decided to her out with her experiment, like you did. he designed an
investigation where he used pucks with different masses and hit them all with the same amount of force.
in order to be sure he hit the puck with the same amount of force each time, he asked sara if he could
borrow her robotic hockey stick swinging machine, and set the length of the swing to 40 cm every time.
check-in: why do you think mike wanted to hit the different pucks with the same force every time?

What does the symbol (–hfus) indicate in a phase change?

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?

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.)