Graphite breaks apart when it is rubbed. Which measure on the hardness scale matches the hardness of graphite? a 1

b 4

c 8

d 10

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?