Chemical Reactions Unit Test PDF

Chemical Reactions: Name: _________________________________ Unit Test Period: _______ Date: ____________________ Multiple Choice: (___ point each) ___1. What happens in a chemical rea...

Chemical Reactions: Name: _________________________________ Unit Test Period: _______ Date: ____________________ Multiple Choice: (___ point each) ___1. What happens in a chemical reaction? A. The mass of the products is greater than the mass of the reactants. B. Heat must be added to the reactants. C. The mass of the reactants must equal the mass of the products. D. Atoms are heated and cooled. ___2. In writing a formula equation for the word equation, magnesium hydroxide + potassium bromide, how would you represent the formula for magnesium hydroxide? A. MgOH C. MnOH B. MgOH2 D. Mg(OH)2 ___3. The chemical formula for potassium chlorate, KClO3, means that each formula unit contains how many atoms of each element? A. 1K, 1Cl, 3O C. 0K, 0Cl, 3O B. 3K, 3Cl, 3O D. 1K, 3ClO ___4. What are the coefficients of the correctly balanced equation? ___Fe2O3 + ___CO ➞ ___Fe + ___CO2 A. 1,3,2,3 C. 1,2,2,2 B. 0,2,2,3 D. 2,6,4,3 ___5. Which of the following is a balanced equation? A. H2 + Br2 ➞ 2HBr C. H2 + 2Br2 ➞ 2HBr B. H2 + Br2 ➞ HBr D. 2H2 + Br2 ➞ HBr ___6. In a balanced equation, a product is written 4Al2O3. Which of the following shows the number of aluminum atoms and oxygen atoms in this product? A. 8 atoms Al and 3 atoms O C. 8 atoms Al and 12 atoms O B. 6 atoms Al and 3 atoms O D. 6 atoms Al and 7 atoms O ___7. Which of the following represents a chemical reaction? A. Salt dissolved in water C. Water is boiled B. Gasoline combusts in a car engine. D. Copper metal is stretched into a wire. ___8. What type of reaction is shown below. Zn(s) + 2HCl(aq) ➞ ZnCl2(aq) + H2(g) A. precipitation C. double replacement B. synthesis D. single replacement ___9. Which of the follow equations is balanced? A. Na + 2Cl ➞ 2NaCl2 C. Na + Cl2 ➞ 2NaCl B. 2Na + Cl2 ➞ NaCl2 D. 2Na + Cl2 ➞ 2NaCl ___10. In what type of reaction is a single reactant broken down in to other substances? A. synthesis C. decomposition B. single replacement D. double replacement ___11. Will the following reaction occur? Pb + Ca(C2H3O2)2 ➞ Ca + Pb(C2H3O2)2 A. Yes, lead will replace calcium. C. No, lead cannot replace calcium. B. Yes, acetates are always soluble. D. No, lead will not react with acetate. ___12. Chlorine gas is produced by an anionic single replacement reaction. The halogen that replaced chlorine in the reaction must be A. bromine. C. iodine. B. astatine. D. fluorine. ___13. What kind of reaction occurs when sodium is placed in water? A. single replacement reaction C. double replacement reaction B. decomposition reaction D. electrolysis ___14. When a solid produced by a chemical reaction separates from the solution it is called A. a molecule C. a reactant B. the mass of the product D. a precipitate ___15. Predict what will happen when strontium metal is added to a solution of aluminum chloride. A. No reaction will occur. C. Aluminum metal is produced. B. Aluminum stronite is produced. D. Chlorine gas is produced. ___16. In an equation, the symbol for a substance dissolved in a water solution is A. (s) C. (l) B. (aq) D. (g) ___17. A chemical formula written over the arrow in a chemical equation signifies A. an impurity C. a catalyst for the reaction B. a by-product D. the formation of a gas ___18. Which coefficients correctly balance this chemical formula equation? NH4NO2(s) ➞ N2(g) + H2O(l) A. 1,2,2 C. 1,2,1 B. 2,1,2 D. 1,1,2 ___19. Will the following reaction occur? Ca(NO3)2 + 2HBr ➞ CaBr2 + 2HNO3 A. Yes, calcium can replace hydrogen in an acid. C. Yes, calcium bromide is formed. B. No, two aqueous products are produced. D. No, just one precipitate is formed. ___20. When solutions of CaCO3 and Al2(SO4)3 are mixed together, what precipitate, if any, will form? A. Al2(CO3)3 C. No precipitate will form, all products are soluble. B. CaSO4 D. Both products form a precipitate. Identify the type of each of the following chemical reactions. (___ point each) A. synthesis C. single replacement E. combustion B. decomposition D. double replacement ___21. Ca + O2 ➞ CaO ___24. Al + Fe(NO3)2 ➞ Al(NO3)3 + Fe ___22. C4H10 + O2 ➞ CO2 + H2O ___25. MgO + HCl ➞ MgCl2 + H2O ___23. NH4NO2 ➞ NH3 + H2O ___26. (NH4)3PO4 + Sr(OH)2 ➞ Sr3(PO4)2 + NH4OH Predict the products for the following equations. If the equation won’t occur, write NR after the arrow. If it is a double replacement reaction that will occur, identify the precipitate in the product. (___ point each) 27. ___Pb(NO3)2(aq) + KI(aq) ➞ 28. ___Fe(s) + ___Al(NO3)3(aq) ➞ 29. ___(NH4)2S(aq) + ___FeCl2(aq) ➞ 30. ___C3H8(g) + ___O2(g) ➞ 31. ___Cl2(g) + ___NaI(s) ➞ 32. ___Al(NO3)3(aq) + ___K2SO4(aq) ➞ Write the balanced formula equation (predicting the product and precipitate), the complete ionic equation, and the net ionic equation for the reaction: Sr(NO3)2(aq) + K2SO4(aq) ➞ (___ point each) 33. Balanced formula equation: 34. Complete ionic equation: 35. Net ionic equation: