4. Sodium (Na) metal reacts with water (H O) to form sodium hydroxide (NaOH) and hydrogen (H ) gas. Why is this change a chemical change?
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1 1. What is the chemical formula for dinitrogen monoxide? A N O B NO C NO D N O 2. Which of the following is NOT a clue that a chemical reaction is occurring? F gas formation G precipitation of a solid H change in the size and shape of a solid J color change 3. Which of the following is NOT the result of a chemical change? A soured milk B rusted metal C ground flour D digested food 4. Sodium (Na) metal reacts with water (H O) to form sodium hydroxide (NaOH) and hydrogen (H ) gas. Why is this change a chemical change? F because water is involved in the reaction G because new substances are formed H because the metal disappears in the water J because the amount of matter changes 5. Which of the following states the law of conservation of mass? A Atoms are rearranged in a chemical reaction, and some join new molecules. B Two compounds combine to form a new compound with different properties. C Mass cannot be created or destroyed in a chemical reaction. D Energy is neither created nor destroyed in a chemical reaction. 6. The chemical formula for ethanol is C H O. How many total atoms are in 30 molecules of ethanol? 7. Calculate the total number of atoms in the molecule represented by the following chemical formula: Na 3PO 4 A 3 B 11 C 8 D Which of the following equations is balanced? F 2Fe O Fe O G Al CuSO Al (SO ) + Cu H 3Mg(OH) 2HCl MgCl + H O J H CO H O + CO
2 9. Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an example of A activation energy. B the law of conservation of energy C the law of conservation of mass. D a double-displacement reaction. 10. Look at the equations above. Which statement about these equations is true? F Equation 1 shows an endothermic reaction, and Equation 2 shows an exothermic reaction. G Equation 1 shows an exothermic reaction, and Equation 2 shows an endothermic reaction. H Both equations show exothermic reactions. J Both equations show endothermic reactions. 11. What information about a substance does a chemical formula provide? A how many atoms of each element are in a molecule B each element that s present in the substance C the total number of atoms in a molecule of the substance D all of the above 12. What is the correct position for a subscript in a chemical formula? F to the right of the element symbol G to the left of the element symbol H to the right and below the element symbol J to the right and above the element symbol 13. How many atoms of each element are in the formula below? C 2H 5OH A 1 C, 5 H, 1 O B 2 C, 5 H, 1 OH C 2 C, 6 H, 1 O D 1 C, 3 H, 5 O 14. What conclusion can be made about the properties of compounds containing the same elements? F More than one compound cannot be made from the same elements. G The properties of all the compounds are the same. H The properties of all the compounds are similar. J The properties of all the compounds are different. 15. What is the significance of a chemical formula that has no subscripts? A This indicates a nonexistent substance. B All the elements are in a 0:0 ratio. C All the elements are in a 1:1 ratio. D All the elements are in an unknown ratio. 16. How many atoms are in a molecule of the compound CH 3COC 10H 6OH? F 8 G 3 H 24 J 25
3 17. One molecule of a compound contains one nitrogen atom and two oxygen atoms. What is the correct chemical formula for this compound? A NoO B O 2N C N 2O D NO A change in a substance occurred that did not involve a change in the identity of the substance. What kind of change took place? F both a physical and a chemical change G neither a physical nor a chemical change H a physical change J a chemical change 19. Which one of the following does not always indicate that a chemical change has taken place? A a color change occurs B an odor is produced C a precipitate forms D a solid forms 20. What type of reaction produces a new substance from simpler substances? F decomposition G synthesis H combustion J burning 21. What type of reaction produces simpler substances, other than water and carbon dioxide, from a more complex one? A decomposition B synthesis C combustion D burning 22. What type of change takes place when water boils to produce steam? F decomposition G a chemical change H a physical change J no change occurs 23. Which of these is a chemical change? A melting a piece of wax B dissolving sugar in water C tearing a sheet of paper D burning a log 24. What names are given to the substances that take part in a chemical reaction and those that are the result of the reaction? F products, reactants G reactants, products H atoms, compounds J compounds, products
4 25. What reactant is always involved in a combustion reaction? A hydrogen B carbon C oxygen D methane 26. Which information is not necessary to write a balanced chemical equation? F the direction of the reaction G the reactants and products in the reaction H the masses of the reactants and products in the reaction J the atomic symbols and chemical formulas of the reactants and products 27. What does a subscript represent in a chemical formula? A the total number of atoms in a molecule B the number of atoms of an element in a molecule C the total number of grams of an element in a molecule D the number of grams of a substance 28. What does a coefficient represent in a chemical equation? F the number of units of a reactant or product G the number of grams of a reactant or product H the number of liters of a reactant or product J the number of atoms in a reactant or product 29. What happens to the total amount of mass involved in a chemical reaction? A The total amount of mass increases. B The total amount of mass decreases. C The total amount of mass increases or decreases. D The total amount of mass remains constant. 30. How does a balanced chemical equation show the conservation of mass? F The number of molecules on each side of the equation is the same. G The total of the coefficients on each side of the equation is the same. H The number of atoms of each element on both sides of the equation is the same. J The total of the subscripts on each side of the equation is the same. 31. Why can you change the coefficients to balance a chemical equation but not the subscripts? A Changing a coefficient changes the identity of a substance in a reaction. B Changing a coefficient does not change the number of atoms in the reaction. C Changing a subscript changes the number of atoms in the reaction. D Changing a subscript changes the identity of a substance in a reaction. 32. What is not true of the law of conservation of mass and chemical reactions? F The number of atoms in the reactants is the same as the number of atoms in the products. G Atoms are rearranged to produce new substances. H Atoms are not created. J Atoms are not destroyed.
5 33. How do you determine the number of atoms of each element if a chemical formula has both a coefficient and a subscript? A The number of atoms is equal to the subscript. B The number of atoms is equal to the coefficient. C The number of atoms is equal to the coefficient multiplied by the subscript. D The number of atoms is equal to the sum of the coefficient and the subscript. 34. How many atoms are represented in the formula CaCO? F three G four H five J six 35. Calculate the number of oxygen atoms of the molecule represented in the following formula: Al (SO ). 36. What is true of the new materials formed in a chemical reaction? F Properties differ from original materials. G All substances have original properties. H Properties are the same as original materials. J No substances have original properties. 37. Rusting is an example of a A physical property. B physical change. C chemical property. D chemical change. 38. A scientist carries out a reaction in a test tube. After the bubbling stops, she notices that the test tube is very warm. What might she conclude about the reaction? F The reaction happened very quickly. G The reaction is endothermic. H The reaction is exothermic. J No reaction took place. 39. Balancing a chemical equation so that the same number of atoms of each element is found in both the reactants and the products is an example of A activation energy. B the law of conservation of energy. C the law of conservation of mass. D a double-displacement reaction. 40. Which describes what happens to atoms in a chemical reaction? F sometimes lost, never rearranged G sometimes lost, gained, or rearranged H never lost or gained, just rearranged J lost or gained, never rearranged
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