For the reaction: n2(g) + 3h2(g)⇔ 2nh3(g), at a particular temperature, the concentrations of n2, h2 and nh3 are 2.1 x 10–3 m, 3.2 x 10–2 m, and 1.8 x 10–1 m, respectively. calculate a value of k for this reaction

List four observations that indicate that a chemical reaction may be taking place

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size