Enter your Name:   Enter your E-mail Address:  01. What are the four classifications that we learned for matter? 02. What are the two classifications for the changes that matter undergoes? 03. If a substance is an element, is it a pure substance or a mixture? 04a. Classify fruit salad as element, compound, homogeneous mixture, or heterogeneous mixture. 04b. Classify aluminum foil as element, compound, homogeneous mixture, or heterogeneous mixture. 04c. Classify a pile of as element, compound, homogeneous mixture, or heterogeneous mixture. 04d. Classify fertilizer dissolved in water as element, compound, homogeneous mixture, or heterogeneous mixture. 05. What are the differences between solid HCl and liquid HCl? 06. If a substance goes from the gas phase to the liquid phase, was it heated or cooled? 07. Since ice floats in water, does frozen float in liquid ? 08a. Classify the following change as physical or chemical: A lawn gets mowed. 08b. Classify the following change as physical or chemical: A frozen turkey thaws. 08c. Classify the following change as physical or chemical: Wood burns in a fireplace. 09. Which of the following elements are homonuclear diatomics? Write their chemical formulas. carbon, nitrogen, fluorine, sodium 10. 2HBr(aq) + Ca(s) ---> CaBr2(aq) + H2(g) 11. Balance the following equation: H2O(l) + Na(s) ---> NaOH(aq) + H2(g) 12. Under the right conditions, chlorine gas will react with gaseous ethylyne, to make liquid quadrachloroethylne, . Write the balanced chemical equation. 13. When reacts with oxygen, it makes carbon dioxide and water. Write the balanced chemical equation. 14. Balance the following equation for the combustion of ethanol: C2H6O(l) + O2(g) ---> CO2(g) + H2O(g) 15. How does a balanced chemical equation ensure that mass is conserved during a chemical reaction?