Tornadoes can be identified and tracked using advanced instruments that can detect small changes in wind velocity and air pressure. What benefit do these instruments provide?
A.
They can predict tornadoes weeks in advance.
B.
They can change the path of a tornado.
C.
They can be used to issue early tornado warnings.
D.
They can prevent most tornadoes from forming.

Type the letter that represents the correct location for each particle type below.

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution