Which formula equation shows a reversible reaction? 2 Upper N a + Upper F Subscript 2 Baseline right arrow 2 Upper N a Upper F. Upper C a Upper C Upper O Subscript 3 Baseline right arrow Upper C a Upper O + Upper C Upper O Subscript 2. Upper N Upper H Subscript 4 Baseline Upper C l (s) double-pointed arrow Upper N Upper H Subscript 3 Baseline (g) + Upper H Upper C l (g). 2 Upper H Subscript 2 Baseline Upper O Subscript 2 Baseline (a q) right arrow with n above it 2 Upper H Subscript 2 Baseline Upper O (l) + Upper O Subscript 2 Baseline (g).

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)? a. 5.0 × 103 b. 5.0 × 10-3 c. 5.0 × 1017 d. 5.0 × 10-17

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

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