Unit 1

_{Substances that dissociate in water and release hydrogen ions (H+)}

• bases
• acids
• compounds
• ions

_{Which of the following is NOT true of atoms?}

• They are composed of molecules.
• They can combine with other atoms.
• They make up elements
• They are extremely small

_{A negatively charged particle moving around the nucleus of an atom}

• neutron
• proton
• electron 
• ion

_{What particle is found in the nucleus and has no charge?}

• electron
• neutron
• proton
• atom

_{What determines the chemical properties of an atom?}

• The number of protons in the nucleus
• Number of electrons in the outside shell
• The number of protons in the outside shell
• The number of electrons in the nucleus

_{Atoms having the same number of protons but different numbers of neutrons}

• molecule
• atom
• compound
• isotopes

Two or more atoms combined

• Molecule
• Compound
• Isotope
• Ion

_{Attraction between slightly positive atom of one molecule to a slightly negative atom of another molecule} 

• ionic bond
• hydrogen bond
• covalent bond
• van der Waals

_{Attractions between molecules of the same substance}

• adhesion
• cohesion
• mixture
• acid

_{Who am I? I'm a polymer composed of amino acids that are linked by peptide bonds. Amino acid bonds determine my folds.} 

• Lipid
• Carbohydrate
• Protein
• Sugar