PLZ HELP GIVING BRAINLEST TO WHOEVER HELPS AND GETS THE RIGHT ANSWER. Plz and Tysm What kind of energy is often an unwanted by - product of energy transformations?

1. Chemical energy

2. Light energy

3. Potential energy

4. Thermal energy

Which of the following electromagnetic waves can create ions?

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 are the similarities of physical and chemical change ?