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1. Which of the following is NOT an element? Rock Calcium Hydrogen Silicon 2. True or False Elements are pure substances. True False What percentage ofthe crust do "Al" and "Si" make up? 3. about 8% about 36% about 28% about 2% a pure substance made of two or more elements chemically bonded located on the periodic table made of only one type of atom 4. Which statementshould be listed under compounds? A. B. D. C. located on the periodic table a pure substance made of two or more elements chemically bonded both A and C 5. Which statementshould be listed under elements? Pure substances made of two or more elements chemically bonded necessary for life made of only one type of atom 6. Which statementshould be listed in the middle? 7. How many elements are in the compound: BrNMgCPbFC 15 8 14 7 8.All of the following are evidence of a chemicalreaction/change except: a gas being created pouring two liquids together an unexpected change in color the temperature of a substance raising 15 degrees. (exothermic) 9. Mrs. Davis mixed two liquids together. After sittingfor 2 minutes the liquids became a solid. This is evidence of: liquids always mix and form a solid there was no chemical change a chemical change Mrs. Davis waited too long 10. Mrs. Ruble poured two solids into a plastic bag. She then poured in a red liquid. The substances in the bag quickly became hot. Has Mrs. Ruble seen a chemical reaction? No Yes 11.Mrs. Ruble burned sugar in class on a hot plate for everyone to see. The sugar changed from a whitesolid to a nasty black solid. She explained that the main evidence proving that the sugar chemicallychanged was: the sugar changed from solid to liquid the sugar changed color the sugar can change back to its original state both A & B (1st & 2nd answer choice) 12.All of the following are examples of chemical changesEXCEPT: gas being created leaves changing color carbon and oxygen forming CO2 dogs barking 13. True or False Tearing paper, ice melting, and dry ice turning backinto a gas are examples of chemical changes. True False |