1) What is H2O commonly known as? a) Salt b) Water c) Oxygen d) Acid 2) What is the pH of water? a) 3 b) 5 c) 7 d) 9 3) Which element has the atomic number 6? a) Oxygen b) Carbon c) Hydrogen d) Nitrogen 4) What type of bond shares electrons? a) Ionic b) Covalent c) Metallic d) Hydrogen 5) What is the main gas in the Earth's atmosphere? a) Oxygen b) Hydrogen c) Carbon Dioxide d) Nitrogen 6) What is the chemical formula for table salt? a) NaCl b) KCl c) H2SO4 d) C12H22O11 7) Which is not a state of matter? a) Solid b) Liquid c) Plasma d) Vacuum 8) What is the process of liquid turning into gas? a) Freezing b) Condensation c) Evaporation d) Sublimation 9) Which is a noble gas? a) Neon b) Oxygen c) Mercury d) Iron 10) What is the chemical symbol for gold? a) Ag b) Au c) Fe d) Gd

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