Chemical reactions occur when chemical bonds between atoms are formed or broken. reactants come together and produce a reaction at the end known as the products. a reactant combined with another is written as a chemical formula. usually in a chemical formula an arrow is drawn between the reactants and products to indicate the direction of the chemical reaction. some chemical reactions run in one direction until the reactants are used up. these are known to be irreversible reactions. other reactions, however, are classified as reversible. reversible reactions can go in both the forward and backward.

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 of these features are formed when hot groundwater is forced out through cracks in the earth's surface?

What is the percentage of hydrogen in c2h4