Which description best characterizes the motion of particles in a solid? a. slow but able to move past one another
b. fast and widely spaced
c. not moving
d. vibrating around fixed positions

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

What is the independent variable in this investigation? mass volume sample number substance density

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?