Chemical Formulas, Equations, and Reactions Test
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1 Name: Period: Chemical Formulas, Equations, and Reactions Test Write all answers on your answer document. 1. Which of the following is a NOT a physical property of hydrogen? A. It is gas C. It is colorless B. It is flammable D. It has no smell 2. Which of the following is an example of a chemical change? A. melting solid gold C. dissolving sugar in water B. burning hydrogen gas D. breaking a sheet of glass 3. Which of the following is an example of a physical change? A. Mixing baking soda and vinegar together, and this causes bubbles and foam. B. A glass cup falls from the counter and shatters on the ground. C. Lighting a piece of paper on fire and the paper burns up and leaves ashes. D. Baking a birthday cake for your friend. 4. Which change can be easily reversed? A. chemical change C. both a physical and chemical change B. physical change D. neither a physical or chemical change 5. Diane draws a picture on a piece of paper and then folds it into a paper airplane. She throws it at her little brother, and it hits him in the foot. He responds by ripping up the paper. Which of the following is an example of a physical change? A. ripping up the paper C. drawing on the paper B. folding the paper into an airplane D. all of these 6. Use the Periodic Table to determine which elements are in the following compound. H 2 SO 4 A. Sulfur, Helium, Oxygen C. Selenium, Helium, Oxygen B. Sulfur, Hydrogen, Oxygen D. Sodium, Hydrogen, Oxygen Academic 1
2 7. How many total atoms are in the formula? A. 2 C. 6 B. 4 D. 7 H 2 SO 4 Use the following equation for the next 3 questions. 2Mg + O 2 2MgO 8. The large 2 in from of MgO is called a A. exponent C. subscript B. coefficient D. summation 9. In the equation above, what is the subscript of the oxygen molecule? A. O C. 2 B. 1 D What does the arrow in the equation mean? A. equals C. yields B. turns into D. creates 11. New substances formed during a chemical reaction are shown. A. on the left side of the equation and are called products B. on the right side of the equation and are called reactants C. on the left side of the equation and are called reactants D. on the right side of the equation and are called products 12. Which of the following is a TRUE statement? A. In a chemical equation, you can change the number of atoms in each molecule. B. In a chemical equation, you can end up with different number of atoms of an element on the reactant side for the same element on the product side. C. In a chemical equation, an element or compound must be accompanied by a phase change. D. In a chemical equation, the coefficients tell you the number of molecules of each reactant used, and the number of molecules of each product made. Academic 2
3 13. All chemical equations must be balanced. This means that the same number of atoms of each of the elements must be found in both the reactants and the products of the reaction. Which scientific law does this illustrate? A. Law of Products C. Law of Conservation of Mass B. Law of Conservation of Energy D. Law of Subscripts 14. A student mixes two clear solutions. Which of the following is evidence that a chemical reaction is happening? I. color change II. odor change III. temperature change IV. precipitate A I and II C. II, III, and IV B II and III D. I, II, III, IV 15. A student placed 2 grams of baking soda in a balloon and 100 ml of vinegar in an Erlenmeyer flask. After stretching the opening of the balloon across the neck of the flask, the student raised it to dump the baking soda into the flask. He immediately observed foaming bubbles in the flask and the balloon began to expand. The student concluded that A. a physical change only was occurring B. the bubbles indicated a chemical change was occurring C. the baking soda and vinegar were products of a chemical reaction D. the gas was oxygen 16. The following diagram is a model of a molecule of Methane. What is the formula for Methane? A CH4 B CH8 C C8H4 D C8H8 Academic 3
4 17. Which of the following equations follows the Law of Conservation of Mass? A 3H 2 O 3H 2 + 3O 2 C 2Na + Cl NaCl B C + 4H 2 CH 4 D C 2 H 4 + 3O 2 2CO 2 + 2H 2 O 18. Which of these unbalanced equations shows rust, Fe 2 O 3, forming when oxygen, O 2, reacts with iron, Fe? A Fe 2 O 3 O 2 + Fe C Fe 2 O 3 + Fe O 2 B Fe O 2 + Fe 2 O 3 D O 2 + Fe Fe 2 O Which of the following set of coefficients would balance the following equation? Na2SO4 + _ Mg _Na + MgSO4 A 1,1,2,1 B 1,2,1,2 C 2,1,1,2 D 2,1,2,1 USE THE FOLLOWING TABLE FOR THE NEXT TWO QUESTIONS Name Formula Water H 2 O Hydrogen Peroxide H 2 O 2 Hydronium H 3 O Hydroxide OH 20. What does H 2 O 2 stand for? A Water B. Hydrogen Peroxide C. Hydronium D. Hydroxide 21. How many atoms of oxygen can be found in a hydronium molecule? A. O C. 2 B. 1 D. 3 Academic 4
5 22. In a chemical reaction, energy may be absorbed or released as bonds between atoms change. A reaction in which heat is released is called A. an endothermic reaction C. an exothermic reaction B. chemical weathering D. carbonation 23. Which of the following statements is true? A. A container in which an exothermic reaction is occurring will feel cool. B. An explosion is an example of an endothermic reaction. C. Ice crystals will form in a container in which an exothermic reaction is occurring. D. A container in which an exothermic reaction is occurring will feel warm. 24. Jason recorded the temperature of 150 ml of liquid A. He then added 5g of powder B to liquid A and recorded the temperature. What type of reaction occurred in Jason s experiment? Initial temperature Final temperature A. endothermic reaction C. igloo reaction B. exothermic reaction D. insulation reaction Academic 5
6 25. Which reaction is exothermic? A. Reaction A C. Reaction C B. Reaction B D. Reaction D Balance the following equations. Write you answer on your answer document. 26. NaBr + Cl 2 NaCl + Br 2 Bonus Start with the number of consonants in the alphabet and multiply by the first prime number that comes after 8. Now, add the number of seconds in one day. Next multiply by the average number of neutrons in Boron s nucleus. Add the number of stars on the American flag and then add the temperature at which water freezes in Fahrenheit. Lastly, multiply by the approximate number of minutes it takes light to travel from the Sun to Earth. Write your answer on your answer document. Academic 6
Chemical Formulas, Equations, and Reactions Test Pre-AP Write all answers on your answer document.
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