8th Grade Chemistry QuizVersion en ligne Test your knowledge of 8th grade chemistry concepts with this fun quiz! par theresita shanthi 1 What is the chemical formula for water? a CO2 b O2 c H2O d NaCl 2 Which of the following is a noble gas? a Nitrogen b Hydrogen c Oxygen d Neon 3 What is the pH level of pure water? a 10 b 0 c 7 d 14 4 What is the process of a solid turning into a gas called? a Evaporation b Condensation c Melting d Sublimation 5 Which element has the atomic number 6? a Helium b Carbon c Nitrogen d Oxygen 6 What is the main gas found in the air we breathe? a Nitrogen b Carbon Dioxide c Hydrogen d Oxygen 7 What type of bond involves the sharing of electron pairs? a Metallic bond b Hydrogen bond c Ionic bond d Covalent bond 8 Which of the following is an example of an acid? a Ammonia b Hydrochloric acid c Calcium carbonate d Sodium hydroxide 9 What is the smallest unit of an element? a Ion b Molecule c Compound d Atom 10 What is the term for a substance that speeds up a chemical reaction? a Product b Solvent c Catalyst d Reagent
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