1) rat eof reaction is higher at a) high temperature b) low temperature 2) Which element has the chemical symbol O? a) Oxygen b) Hydrogen 3) What is the chemical symbol for Sodium? a) Na b) H 4) Which element has the atomic number 6? a) carbon b) Nitrogen 5) What is the symbol for Iron? a) Fe b) Ir 6) Which group contains the Noble Gases? a) 8 b) 1 7) what compound would be formed in a reaction between sodium and chlorine a) Sodium chloride b) sodium nitrate 8) What is the difference between a physical change and a chemical change? a) Physical changes are usually reversible. b) Both changes are usually reversible. 9) Burning a) chemical change b) Physical change 10) Air a) Mixture b) Compound 11) Name of an experiment that separate compound in to its elements a) Electrolysis b) Extraction

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