1. Which laboratory glassware is shown in the diagram below?

Transcription

1 1. Which laboratory glassware is shown in the diagram below? A) beaker B) Erlenmeyer flask C) crucible D) evaporating dish 2. Given the diagram representing a process being used to separate the colored dyes in food coloring: Which process is represented by this diagram? A) chromatography B) electrolysis C) distillation D) titration 3. The diagram below represents a portion of a 100-milliliter graduated cylinder. What is the reading of the meniscus? A) 35.0 ml B) 36.0 ml C) 44.0 ml D) 45.0 ml

2 4. A sample of water is being heated from 20 C to 30 C, and the temperature is recorded every 2 minutes. Which table would be most appropriate for recording the data? A) B) C) D) 5. Flame tests are used to identify A) metallic ions B) nonmetallic ions C) polar molecules D) nonpolar molecules

3 6. The diagram below represents a section of a buret containing acid used in an acid-base titration. 8. The diagram below shows the upper part of a laboratory burner. What is the total volume of acid that was used? A) 1.10 ml B) 1.30 ml C) 1.40 ml D) 1.45 ml 7. The diagram below shows a portion of a buret. Which letter represents the hottest part of the burner flame? A) A B) B C) C D) D 9. A Bunsen burner flame is sooty black and mixed with an orange-yellow color. Which is the probable reason for this condition? A) No oxygen is mixing with the gas. B) No gas is mixing with the oxygen. C) Insufficient oxygen is mixing with the gas. D) Insufficient gas is mixing with the oxygen. 10. Which laboratory glassware is shown in the diagram below? What is the meniscus reading in milliliters? A) B) C) D) A) Florence flask B) Erlenmeyer flask C) distilling flask D) volumetric flask

4 11. The diagram below represents a portion of a triple-beam balance. If the beams are in balance with the riders in the positions shown, what is the total mass of the object? A) g B) g C) g D) g 12. An aluminum sample has a mass of g and a density of 2.70 g/cm 3. According to the data, to what number of significant figures should the calculated volume of the aluminum sample be expressed? A) 1 B) 2 C) 3 D) Which unit is used to express an amount of thermal energy? A) gram B) mole C) joule D) pascal 14. Which unit is used to express the pressure of a gas? A) mole B) joule C) kelvin D) pascal 15. A sample of an element has a mass of grams and a volume of 3.8 cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed? A) 5 B) 2 C) 3 D) A student calculates the density of an unknown solid. The mass is grams, and the volume is 8.21 cubic centimeters. How many significant figures should appear in the final answer? A) 1 B) 2 C) 3 D) Which mass measurement contains four significant figures? A) g B) g C) 1003 g D) 3870 g 18. Expressed to the correct number of significant figures, the sum of two masses is grams. Which two masses produce this answer? A) g g B) g g C) g g D) g g 19. During a laboratory experiment, a sample of aluminum is found to have a mass of grams and a volume of 4.6 milliliters. What is the density of this sample, expressed to the correct number of significant figures? A) g/ml B) 2.72 g/ml C) 3 g/ml D) 2.7 g/ml 20. A student measures the mass and volume of a sample of copper at room temperature and kpa. The mass is 48.9 grams and the volume is 5.00 cubic centimeters. The student calculates the density of the sample. What is the percent error of the student's calculated density? A) 7.4% B) 8.4% C) 9.2% D) 10.2% 21. A student calculated the percent by mass of water in a hydrate as 14.2%. A hydrate is a compound that contains water as part of its crystal structure. If the accepted value is 14.7%, the student's percent error was A) B) C) D)

5 22. A student found the boiling point of a liquid to be. If the liquid's actual boiling point is, the experimental percent error is equal to A) B) 23. What is the safest method for diluting concentrated sulfuric acid with water? A) add the acid to the water quickly B) add the water to the acid quickly C) add the acid to the water slowly while stirring D) add the water to the acid slowly while stirring C) D)