A toy helicopter takes off and moves 2 m up and then 2 m back down. What is the displacement of the helicopter?
A. 0 m
B. 2 m down
C. 2 m up
D. 4 m

What does x represent in the formula for the compound xcl4?

Which words or phrases identify layers of groundwater? check all that apply. water table kettle lake saturation zone underground lake sinkhole will give brainiest, answer quickly.

The equation below shows the reaction of zinc with hydrochloric acid (hcl). zn (s) + 2 hcl (aq) —> zncl2 (aq) + h2 (g) what will happen if the concentration of hcl is decreased? a. more zncl2 will be produced. b. the reaction rate will slow down. c. the hydrochloric acid will become more acidic. d. the reaction will produce water instead of hydrogen gas.