Chemistry Attitudes, Skills, & Knowledge Survey (CASKS) Form 3

Transcription

1 Chemistry Attitudes, Skills, & Knowledge Survey (CASKS) Form 3 Directions to Students: Do not open this booklet until you are told to do so. Please respond to the following items by marking the best answer on your answer sheet using a #2 pencil. Please do not write on this survey. Scratch paper will be provided on request. If you do not understand what is being asked in an item, please ask the survey administrator for clarification. Calculators not permitted. Arizona Collaborative for Excellence in the Preparation of Teachers Supported by the National Science Foundation under Grant DUE September, 2000

2 1. Which best describes your race or ethnic background? A. American Indian B. Asian/Pacific Islander C. Hispanic D. Black E. White 2. What is the highest level of education your mother obtained? A. did not finish high school B. high school graduate C. some education after high school D. college graduate E. I don t know 3. What is the highest level of education your father obtained? A. did not finish high school B. high school graduate C. some education after high school D. college graduate E. I don t know Use the following key to indicate to what degree you agree with items A. strongly agree B. agree C. don't know D. disagree E. strongly disagree 4. I am good at chemistry. 5. Chemistry is useful for everyday problems. 6. Hypotheses/theories can not be proved to be true beyond any doubt. 7. To test a hypothesis, one needs a prediction. 8. The primary goal of modern science is to discover facts about nature. 9. Coming up with hypotheses requires creative thinking. 1

3 10. To the right are drawings of two cylinders filled to the same level with water. The cylinders are identical in size and shape. Also shown at the right are two marbles, one glass and one steel. The marbles are the same size but the steel one is much heavier than the glass one. When the glass marble is put into Cylinder 1 it sinks to the bottom and the water level rises to the 6th mark. If we put the steel marble into Cylinder 2, the water will rise A. to the same level as it did in Cylinder 1 B. to a higher level than it did in Cylinder 1 C. to a lower level than it did in Cylinder because A. the steel marble will sink faster. B. the marbles are made of different materials. C. the steel marble is heavier than the glass marble. D. the glass marble creates less pressure. E. the marbles are the same size. 12. Three red square pieces of wood, four yellow square pieces, and five blue square pieces are put into a cloth bag. Four red round pieces, two yellow round pieces, and three blue round pieces are also put into the bag. All the pieces are then mixed about. Suppose someone reaches into the bag (without looking and without feeling for a particular shape piece) and pulls out one piece. What are the chances that the piece is a red round or blue round piece? A. can not be determined B. 1 chance out of 3 C. 1 chance out of 21 D. 15 chances out of 21 E. 1 chance out of 2 2

4 13. because A. 1 of the 2 shapes is round. B. 15 of the 21 pieces are red or blue. C. there is no way to tell which piece will be picked. D. only 1 of the 21 pieces is picked out of the bag. E. 1 of every 3 pieces is a red or blue round piece. 14. A student put a drop of blood on a microscope slide and then looked at the blood under a microscope. As you can see in the diagram below, the magnified red blood cells look like little round balls. After adding a few drops of salt water to the drop of blood, the student noticed that the cells appeared to become smaller. This observation raises an interesting question: Why do the red blood cells appear smaller? Here are two possible explanations: I. Salt ions (Na+ and Cl-) push on the cell membranes and make the cells appear smaller. II. Water molecules are attracted to the salt ions so the water molecules move out of the cells and leave the cells smaller. To test these explanations, the student used some salt water, a very accurate weighing device, and some water-filled plastic bags, and assumed the plastic behaves just like red-blood-cell membranes. The experiment involved carefully weighing a water-filled bag in a salt solution for ten minutes and then reweighing the bag. What result of the experiment would best show that explanation I is probably wrong? A. the bag loses weight B. the bag weighs the same C. the bag appears smaller 15. What result of the experiment would best show that explanation II is probably wrong? A. the bag loses weight B. the bag weighs the same C. the bag appears smaller 3

5 16. Below is a list of properties of a sample of solid sulfur: i. Brittle, crystalline solid ii. Melting point of C iii. Yellow color iv. Combines with oxygen to form sulfur dioxide Which, if any, of these properties would be the same for one single atom of sulfur obtained from the sample? A. i and ii only B. iii and iv only C. iv only D. All of these properties would be the same E. None of these properties would be the same 17. Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to turn entirely to rust, the rust should weigh: A. less than the nail it came from. B. the same as the nail it came from. C. more than the nail it came from. D. it is impossible to predict. 18. because A. rusting makes the nail lighter. B. rust contains iron and oxygen. C. the nail flakes away. D. the iron from the nail is destroyed. E. the flaky rust weighs less than iron 19. Consider the following reaction: Cr 2 O 3 (s) + 3CCl 4 (l) 2CrCl 3 (s) + 3COCl 2 (g) green solid colorless liquid purple solid colorless gas When the green solid is mixed with the colorless liquid, the mixture starts to bubble and fume. When all action has stopped, a dry purple solid containing solid green specks remains. Which substance is the limiting reactant? A. Cr 2 O 3 B. CCl 4 C. CrCl 3 D. COCl 2 E. there is no limiting reactant 4

6 20. Which arrow on the phase diagram corresponds to the phase change illustrated on the left? A. 1 B. 2 C. 3 D. 4 E In an experiment, 12.0 grams of solid carbon reacted with oxygen gas to form 44.0 grams of carbon dioxide gas. How many grams of oxygen reacted with the carbon? A grams B grams C grams D grams 22. Which of the following graphs shows how the rate of evaporation changes with changes in water temperature? 5

7 Use the following illustration when answering item 23. valve A B 23. Two bulbs of equal volumes contain a gas. The gas pressure is equal in both bulbs. Bulb B is heated to a temperature of 100 C while Bulb A remains at room temperature. During the heating the valve is open. After heating, the valve is closed and the system is allowed to cool. What happens? A. Bulb B will have more molecules than Bulb A. B. Bulb A will have more molecules than Bulb B. C. Bulb B will have greater pressure than Bulb A. D. Bulb A and Bulb B will possess equal pressures. 24. Consider several samples of a substance that contain different amounts of the substance at the same temperature and pressure. Which of the following graphs shows the proper relationship between the density (D) of the substance and its volume (V)? D D D D D V V V V V A B C D E 6

8 Use the following data when answering item 25. Chemical Density (g/ml) Chemical Density (g/ml) Magnesium 1.74 Water 1.00 Aluminum 2.70 Carbon Tetrachloride 1.59 Lead 11.3 Mercury 13.6 Iron 7.87 Gasoline 0.68 Gold 19.3 Ethyl Alcohol Water, gasoline, mercury, and carbon tetrachloride are poured into a graduated cylinder. A sample of magnesium is then dropped into the cylinder. Where would you most likely find the magnesium? A. beneath the water, above the carbon tetrachloride B. beneath the carbon tetrachloride, above the mercury C. beneath the water, above the mercury D. beneath the mercury 7

9 Use the following graph when answering item 26. Distance Diffused Time 26. A drop of food coloring is added to water at room temperature. The diffusion rate of the food coloring is depicted by the graph above. The following experiments were conducted to investigate the diffusion rates under different conditions. Procedure 1 Procedure 2 Procedure 3 Procedure 4 A drop of food coloring was added to warm water. A drop of food coloring is added to cold water. A drop of food coloring is added to salt water. Heated food coloring is added to room temperature water. Which procedure(s) would slow the diffusion rate? A. Procedure 1 and Procedure 4 B. Procedure 1, Procedure 3, and Procedure 4 C. Procedure 2, Procedure 3, and Procedure 4 D. Procedure 2 and Procedure 3 8