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1. Which of the following is NOT an example of a chemical change?
Burning wood Cooking eggs Breaking a rock Dynamite exploding 2. Which of the following IS an example of a chemical change? Cutting a loaf of bread Hydrogen and Oxygen bonding Tearing paper People running True False 3. True or False Nails rusting is an example of a chemical change.
watts, hour pounds, inches length, width mass, volume 4. Density is measured by dividing __________ by __________. 45 g/mL 486 g/mL 6 g/mL 5 g/mL 5. If an object has a mass of 54 grams, and a volume of 9mL, what is its density? Crystal formation always occurs in an experiment. No type of reaction occurred A physical change occurred This may be evidence of a chemical reaction 6. Mr. Bellman was doing an experiment. He mixed two substances together in a flask and noticed that the flask became very cold. Cold enough to form ice crystals on the outside of the flask. Mr. Bellman concluded that:
7. Mrs. Ruble was doing a demonstration in class. She began boiling a beaker of water on a hot plate. Over a period of 5 minutes, students observed steam rising from the beaker and the level of water in the beaker had reduced from 500mL to 350mL. This is evidence of: No change has occurred A change in the state of matter A chemical change An oxidation/reduction reaction 11 7 15 9 8. How many chemical symbols (elements) are represented in the following formula?
HNCaAgOMgPbCuZn An ionic bond between two covalent atoms A chemical reaction A new element being formed Radioactive isotope 9. During a lab experiment, two students observed a faint glow in the beaker. Their substance began to change color and a slight odor as well as heat was detected. They concluded that they had just observed: Make up matter on earth but NOT in space They are pure substances Are located on the periodic table Represented by a chemical symbol 10. Which of the following is NOT true about elements? |