A handbook lists the density of lead as 11.3 g/mL. Several groups of students are attempting to determine the density of a lead weight by various methods. Calculate the average density measured by each group, and the percentage error in each average. Group 1 Group 2 Group 3
Measured Trial 1 12.7 11.5 10.9
Densities Trial 2 11.2 11.4 11.3
(g/mL) Trial 3 10.3 11.4 11.1
Which group was most accurate?
a. Group 1
b. Group 2
c. Group 3
Which group was most precise?
a. Group 1
b. Group 2
c. Group 3

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

Which of the following is true about the speed of light? it depends on the wavelength.