Name: ________________________ Class: ___________________ Date: __________ ID: A As you work these problems, consider and explain: A. What type of question is it? B. How do you know what type of question it is? C. What information are you looking for? D. What information do they give? E. How will you go about solving this? F. Show how to solve the problem. G. Be able to answer for a different reaction, number, set of conditions etc. Unit 1 Sample Questions Consider the following choices when answering questions 1-2 1. Which best represents a gaseous compound? 2. Which best represents a homogeneous mixture of an element and a compound? 3. A solution is also called a A) homogeneous mixture B) heterogeneous mixture C) pure mixture D) compound E) distilled mixture 4. An example of a pure substance is 5. _________ are substances with constant composition that can be broken down into elements by chemical processes. 6. The state of matter for an object that has a definite volume but not a definite shape is 7. The boiling of water is: ( explain if it is a physical or a chemical change? and Why?) 1 Name: ________________________ ID: A 8. The melting point of a certain element is 391°C. What is this on the Fahrenheit scale? Ê ˆ ÁÊÁ ˜ˆ ÁÁÁ T T ÁÁÁÁ 9ÃF ˜˜˜˜ 32ÃF ˜˜˜˜ ÃC ÁÁ ÃF ˜˜ ÁÁÁ 5ÃC ˜˜˜ ÁË ˜¯ Ë ¯ 9. 409 Kelvin equals (give temperature in F and C) 10. 8.1 kilogram(s) contains this many grams. Consider the following three archery targets: I. II. III. 11. Which of the following figure(s) represent a result having high precision? A) Figure I only B) Figure II only C) Figure III only D) Figure I and Figure II E) Figure II and Figure III 12. As part of the calibration of a new laboratory balance, a 1.000-g mass is weighed with the following results: Trial Mass 1 1.201 0.001 2 1.202 0.001 3 1.200 0.001 The balance is: A) Both accurate and precise. B) Accurate but imprecise. C) Precise but inaccurate. D) Both inaccurate and imprecise. E) Accuracy and precision are impossible to determine with the available information. 13. A scientist obtains the number 0.045006700 on a calculator. If this number actually has four (4) significant figures, how should it be written? 14. Express the number 0.000333 in scientific notation. 2 Name: ________________________ ID: A 15. Express 165,000 in exponential notation. 16. You are asked to determine the perimeter of the cover of your textbook. You measure the length as 39.36 cm and the width as 24.83 cm. How many significant figures should you report for the perimeter? 17. Consider the numbers 23.68 and 4.12. The sum of these numbers has ____ significant figures, and the product of these numbers has ____ significant figures. 18. How many significant figures are in 0.00110 19. Convert 0.3980 m to mm. 20. The distance of 21 km equals how many meters? 21. Convert 59.4 mi to km. (1 m = 1.094 yd, 1 mi = 1760 yd) 22. For spring break you and some friends plan a road trip to a sunny destination that is 2105 miles away. If you drive a car that gets 33 miles per gallon and gas costs $3.199/gal, about how much will it cost to get to your destination? 23. Convert 7.9 kg to lb. (1 kg = 2.205 lb) 24. A wavelength of red light is measured at 655 nm. What is this measurement in cm? 25. A 20.0 mL sample of glycerol has a mass of 25.2 grams. What is the mass of a 57-mL sample of glycerol? 3 ID: A Unit 1 Sample Questions Answer Section 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. option c option e A elements, compounds, pure water, carbon dioxide etc Compounds liquid state physical change because the gaseous water is chemically the same as the liquid 736°F 136°C 3 8.1 10 E C 0.04501 4 14. 3.33 10 15. 16. 17. 18. 19. 1.65 10 5 4, 3 3 398.0 mm 20. 21. 22. 23. 24. 25. 2.1 10 m 1 9.56 10 km $200 17 lbs 6.55 x 10-5 cm 72 g 5 4 1