A sample of the Earth’s crust that is 1 cubic foot is found to weigh 171 pounds. The density of granite is known to be 2.75 g/cm3 . Determine if the Earth’s crust is made entirely of granite or not.

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

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

What is a number added in front of a formula in order to balance the equation