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metal's specific heat? 9. What vohume will be occupied by a piece of silicon weighing 61.7g if the density of silicon is 2.33 g/cm³? fo niece of coDpEr metal from 31°C to 84°C. What

metal's specific heat? 9. What vohume will be occupied by a piece of silicon weighing 61.7g if the density of silicon is 2.33 g/cm³? fo niece of coDpEr metal from 31°C to 84°C. What

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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help on #9 please
Practice Lecture Exam #1/A Chem 3A - B. Demmons SI Leader. Nathan Ybanez Give all calculated answers in 3 significant figures. 1.1) Which of the following has the greatest mumber of significant figures? a).1412 b) .0075 c) 4.51 d) 14,100 ii) Which of the following has the least number of significant figures? a) .00945 b) 10.57 c) 610 d) 19.2 2. T/F: The ability of a metal to oxidize (nust) is a chemical property T/F: Melting ice is a physical chamnge T/F: Homogeneous refers to the ability to distinguish the components of a mixture. T/F: An object's color is a physical property. T/F: An objectťs boiling point is a chemical property. T/F: In a mixture, the solvent is the substance doing the dissolving and the solute is the substance being dissolved. 3. Which of the following is NOT a characteristic of a non-metal? b) shiny a) crumbles c) dull d) powdery 4. Potassium chlorate (KC10;) breaks apart into potassium chloride (KCI) and oxygen gas (O2) when heated with manganese dioxide as a catalyst. It also has a boiling point of 400°C. The breakdown of KCI1O; is a property. b) physical, physical change and its boiling point is a a) physical, chemical c) chemical, chemical d) chemical, physical 5. i) Which might appear to be a homogeneous mixture? b) orange juice w/ pulp a) salt water c) vegetable oil d) salad dressing e) a and c ii) Which might appear to be a heterogeneous mixture? b) soil d) Gatorade e) none of these a) blood c) sugar water 6. i) Which method would be used to separate a heterogeneous liquid-liquid mixture? b) separatory funnel c) distillation d) filtration a) evaporation ii) Which method would be used to separate a homogeneous solid-liquid mixture? b) evaporation c) separatory funnel d) distillation a) filtration 7. How many kilojoules of energy are required to raise the temperature of 448g of water from 39°C to 50°C? 8. If it takes 849 J of energy to raise the temperature of 218g of an unknown metal from 50°C to 68°C, what is the metal's specific heat? 10. It took 4.15 x 105 J of energy to raise the temperature of a piece of copper metal from 31°C to 84°C. What is the mass of the piece of metal? The specific heat of copper is .0908 cal/g°C. 9. What volume will be occupied by a piece of silicon weighing 61.7g if the density of silicon is 2.33 g/cm³? 12. At one time, silver sold for $5.03 per ounce. If the density of silver is 10.5 g/cm³, calculate the cost of 8.91 cm of silver at that price. (Give this answer in 4 sig figs) 11. The density of magnesium metal is 1.74 g/cc. What is the mass of 85.1 cc of magnesium? 13. The Nutrition Facts on a 12-pack of Dr. Pepper specify that a single serving is one can and that a single serving contains 80 Calories. How many kilojoules of energy are contained in two thirds of the entire 12-pack?
Transcribed Image Text:Practice Lecture Exam #1/A Chem 3A - B. Demmons SI Leader. Nathan Ybanez Give all calculated answers in 3 significant figures. 1.1) Which of the following has the greatest mumber of significant figures? a).1412 b) .0075 c) 4.51 d) 14,100 ii) Which of the following has the least number of significant figures? a) .00945 b) 10.57 c) 610 d) 19.2 2. T/F: The ability of a metal to oxidize (nust) is a chemical property T/F: Melting ice is a physical chamnge T/F: Homogeneous refers to the ability to distinguish the components of a mixture. T/F: An object's color is a physical property. T/F: An objectťs boiling point is a chemical property. T/F: In a mixture, the solvent is the substance doing the dissolving and the solute is the substance being dissolved. 3. Which of the following is NOT a characteristic of a non-metal? b) shiny a) crumbles c) dull d) powdery 4. Potassium chlorate (KC10;) breaks apart into potassium chloride (KCI) and oxygen gas (O2) when heated with manganese dioxide as a catalyst. It also has a boiling point of 400°C. The breakdown of KCI1O; is a property. b) physical, physical change and its boiling point is a a) physical, chemical c) chemical, chemical d) chemical, physical 5. i) Which might appear to be a homogeneous mixture? b) orange juice w/ pulp a) salt water c) vegetable oil d) salad dressing e) a and c ii) Which might appear to be a heterogeneous mixture? b) soil d) Gatorade e) none of these a) blood c) sugar water 6. i) Which method would be used to separate a heterogeneous liquid-liquid mixture? b) separatory funnel c) distillation d) filtration a) evaporation ii) Which method would be used to separate a homogeneous solid-liquid mixture? b) evaporation c) separatory funnel d) distillation a) filtration 7. How many kilojoules of energy are required to raise the temperature of 448g of water from 39°C to 50°C? 8. If it takes 849 J of energy to raise the temperature of 218g of an unknown metal from 50°C to 68°C, what is the metal's specific heat? 10. It took 4.15 x 105 J of energy to raise the temperature of a piece of copper metal from 31°C to 84°C. What is the mass of the piece of metal? The specific heat of copper is .0908 cal/g°C. 9. What volume will be occupied by a piece of silicon weighing 61.7g if the density of silicon is 2.33 g/cm³? 12. At one time, silver sold for $5.03 per ounce. If the density of silver is 10.5 g/cm³, calculate the cost of 8.91 cm of silver at that price. (Give this answer in 4 sig figs) 11. The density of magnesium metal is 1.74 g/cc. What is the mass of 85.1 cc of magnesium? 13. The Nutrition Facts on a 12-pack of Dr. Pepper specify that a single serving is one can and that a single serving contains 80 Calories. How many kilojoules of energy are contained in two thirds of the entire 12-pack?
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