1) 1. Simplest substance which cannot be broken down further by chemical means. a) Mixtures b) Compounds c) Substance d) Elements 2) 2. The following are the parts of atom EXCEPT. a) Cations b) Protons c) Electrons d) Neutrons 3) 3. How many elements are there in the periodic table? a) 116 b) 117 c) 118 d) 119 4) 4. The smallest unit of an element. a) Acids b) Basic c) Matter d) Atoms 5) 5. Molecule made of atoms from different elements that are chemically combined. a) Compounds b) Elements c) Mixtures d) Substances 6) 6. Which of the following is an example of elements? a) H2O b) Ca c) NaCl d) CO2 7) 7. The chemical formula for water (H2O) means that each water molecule contains. a) Two hydrogen atoms and two oxygen atoms b) Two hydrogen atoms and one oxygen atom c) Two hydrogen atoms and zero atom d) One hydrogen atom and two oxygen atoms 8) 8. The chemical element that is most abundant in the human body is a) Nitrogen b) Iron c) Carbon d) Oxygen 9) 9. Which of the following is an example of compounds? a) He b) Cl c) NH3 d) Na 10) 10. All living things contain which element? a) Helium b) Sodium c) Copper d) Carbon

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