1) Which of these describes what goes INTO a chemical reaction? a) products b) reactants 2) Which of these describes the reaction between oxygen, water and iron (forms rust)? a) products b) reactants c) oxidation d) combustion 3) Which of these describes the reaction that combines fuel and oxygen and then releases CO2 and water and heat is released?  a) products b) reactants c) oxidation d) combustion e) c 4) Which of these describes what comes out or is produced of a chemical reaction? a) products b) reactants c) oxidation d) combustion 5) Which number tells you the number of atoms of an element within a chemical formula? a) subscripts b) coefficients 6) Which number tells you the number of molecules/compounds within a chemical formula? a) subscripts b) coefficients 7) This is what the arrow means in a chemical reaction. a) catalyst b) endothermic c) exothermic d) yields or produces 8) This speeds a reaction up without changing the reaction products. a) catalyst b) reactants c) products 9) In the formula 4H2O, how many molecules of water are present? a) 1 b) 4 c) 2 d) 0 10) In the formula 4H2O, how many atoms of hydrogen are present?  a) 1 b) 4 c) 2 d) 8 11) In the formula 4H2O, how many atoms of oxygen are present?  a) 1 b) 4 c) 2 d) 8 12) In the formula C6H12O6, how many atoms of oxygen are present?  a) 1 b) 0 c) 12 d) 6

Chemical Reactions

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