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2.1 I chose this picture because it shows when atoms share a pair of electrons. When they share a pair of electrons it is call covalent bonding. An ionic bond forms through the electrical between oppositely charged ions. Salt (NaCl) is an ionic compound of Na and Cl, salt is held together by ionic bonds. 11/11

2.2 I chose this picture because it shows the attraction among molecules of a substance and the attraction among molecules of different substances. 11/11

2.3 I chose this picture because it shows the difference between monomers and polymers. Monomers are subunits of an entire molecule. A polymer is a molecule that contains many monomers bonded together. 11/11 2.4 I chose this picture because it shows the amount of energy that needs to be absorbed for a chemical reaction to start. this is called activation energy. 11/11 2.5 I chose this picture because because it shows a picture of an enzyme. Enzymes are catalysts for chemical reactions in living things. 11/11