What is an organelle? A. the basic building block of living things; the smallest piece of every organism that has all of the characteristics of a living
thing and can perform all life functions

B. one small part in or around a cell that has a very specialized job or function

C. structure, such as a heart or a leaf, made up of different types of tissues that all work together.
D. the smallest unit of an element that can be considered that element; they make up all matter

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

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

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?