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Worksheet/Pretest 1 Which of the following is/are conserved in a chemical reaction? a) mass b. atoms c. moles d. both mass and atoms 2 The only products if propane burns in air is/are a. CO b. CO2 c. CO2 and H2O d. H2O 3. The mole ratio of two components in a chemical reaction is determined from the a) coefficients of each component c) volume of each component b) mass of each component d) number of atoms of each component 4. When doing a mass-mass calculation, the mass of the first component is first converted into a. liters b. number of atoms c. moles d. number of molecules 5. Which of the following is a correct interpretation of this equation? P 4 + 5 O2 + 2 P2O5 6. If 3.0 moles of Al(NO3)3 are used up in the following balanced reaction, how many moles of HNO3 will be produced? a. 9.0 moles c. 6.0 moles a.1 gram of P4 and 5 grams O2 react to form 2 grams P2O5 b. 1 molecule of P4 and 5 molecules O2 react to form 2 molecules of P2O5 c. 1 mole P4 and 5 moles O2 react to form 2 moles of P2O5 d. both b and c are correct 2 Al(NO3)3(aq) + b. 33.5 g c. 29.2 g Mg(OH)2 a. 0.667 moles b. 3.00 moles c. 1.50 moles + Fe 2 HCl O2 + KClO3 MgCl2 + 2 H2O Fe2O3 KCl + O2 FeCl2 + What mass of FeCl2 could be produced from 35.0 g of Fe and HCl if the balanced reaction is Fe + 2 HCl H2 What mass of zinc could be produced from the reaction of 6.50 g of carbon if the reaction is: C 12. 6 HNO3(aq) d. 6.00 moles 9. Potassium chlorate (KClO3) decomposes to form Potassium chloride and oxygen gas. If 5.4 moles of potassium chlorate decompose, how many moles of oxygen could be produced? 11. + d. 67.0 g 8. If 111.70 g of iron react with oxygen gas to produce iron (III) oxide, how many moles of oxygen gas will be needed? 10. Al2(SO4)3(s) b. 3.0 moles d. 2.0 moles 7. Given the equation to the right, calculate the mass of H2O that would be produced if 33.5 grams of Mg(OH) 2 react. a. 20.7 g 3 H2SO4(aq) + 2 ZnO 2 Zn + CO2 What masses of nitrogen and water could be produced from 45.0 g of ammonia? When ammonia burns in pure oxygen, the reaction is: 4 NH3 + 3 O2 2 N2 + 6 H2O 1. chemical reaction 2. reactant 3. product 4. coefficients 5. A. B. C. D. numbers used to balance chemical equations substance that enters into a chemical reaction process in which a new substance is formed written on the right side of the arrow in a chemical equation Which of the following statements is INCORRECT? a) b) c) d) An equation is balanced by changing subscripts as needed. Chemical equations are balanced to show that matter is conserved. Reactants are substances written to the left of the arrow. Coefficients indicate the relative number of molecules of each substance in a chemical reaction. 6. Which set of coefficients balance the following equation? a) 1, 3, 1, 3 b. 1, 1, 1, 3 Al(OH)3 d. 3, 1, 1, 1 AlCl3 + NaOH c. 3, 1, 3, 1 + NaCl 7. When the equation Al + O2 Al2O3 is balanced using smallest whole number coefficients, what is the coefficient for Al 2O3? a) 1 b. 3 c. 2 d. 4 8. The formula for chlorine gas is a) Cl b) Cl2 (g) c) Cl (g) d) 2Cl (g) + 9. In the chemical equation 2 H2(g) a) 2 grams of water b) 2 liters of water O2(g) 10. Which is the best description of NaCl(aq)? a. sodium chloride molecules dissolved in water c. sodium atoms and chloride atoms dissolved in water . Balance the following chemical equations: 15. PbI2 + AgNO3 Pb(NO3)2 16. Mg + 17. C3H8 18. P4 19. Na2CO3 TiCl4 + + O2 O2 + MgCl2 CO2 + + + 2 H2O(l) the term to the right of the arrow means c) 2 molecules of water d) 2 atoms of water b. sodium chloride crystallized from water solution d. sodium ions and chloride ions dissolved in water AgI N2 21. PbO2 22. Ca + H2O 23. Mg + H3PO4 H2O 24. CaCO3 zinc chloride + + Ti H2O P4O10 HCl NaCl + CO2 + + I2 20. NI3 PbO + O2 Ca(OH)2 + Mg3(PO4)2 CaO + zinc 26. barium chloride 27. calcium hydroxide 28. + hydrochloric acid calcium carbonate + 29. bromine 30. magnesium + + ammonium sulfate hydrogen (gas) ammonium chloride nitric acid calcium nitrate hydrochloric acid calcium chloride + carbon dioxide + sodium iodide + barium sulfate iron(III) chloride + sodium bromide magnesium chloride water + + iodine + iron + CO2 Write balanced equations for the following reactions: 25. H2 water H2