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Name:___________________________________ Date:_______________ Period:___ Review Chemistry I Unit 1: Measurement & Lab Skills 1. Express 580,000 in scientific notation. ________________________ 2. Express 2.03 x 106 in standard notation. _________________________ 3. Express 0.000 000 320 in scientific notation. __________________________ 4. Express 4.1 x 10–4 in standard notation. ___________________________ 5. Define accuracy: ______________________________________________________. 6. Define precision: ______________________________________________________. 7. Six different people weigh a standard mass of 5.00 g on the same balance. Each person obtains a reading of 2.50 g for the mass of the standard. Is the balance accurate? ____ Is the balance precise? _____ Explain: ______________________________________________________________________ 8. These values were recorded as the mass of products when the same chemical reaction was carried out three separate times: 3.20 g; 2.87 g; 3.89 g. The correct mass of products from that reaction was actually 3.45 g. Are the measured masses accurate? ____ Are the measured masses precise? ____ Explain: ______________________________________________________________________ 9. List the base unit and symbol for: Length: ___________ Mass: ___________ Volume: ___________ 10. Rewrite the metric prefixes in order from largest to smallest. deci- (d) milli- (m) kilo- (k) centi- (c) ___________________________________________________ 11. Order the following masses from smallest to largest. cg mg kg dg ___________________________________________________ 1 12. What is the quantity 65.5 m expressed in cm? __________________ 13. Convert 2.3 mL into L. _____________________ 14. 1 m is equal to ________ cm. 15. A student must find the mass of a sample of sulfur powder. The equipment he has triple beam balance, plastic weighing dish, and a scoopula. available are a Describe a procedure for how the student can find the mass of the powder. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ 16. A student uses a triple beam balance to determine the mass of a metal block. The riders of the balance are adjusted as shown below. 0 100 200 300 400 3.0 cm 1.5 cm 1.2 cm 500 0 10 20 30 40 50 60 70 80 90 100 0 1 2 3 4 5 6 7 8 9 10 What is the mass of the metal block? Mass: ________ g Using the measurements given in for the block, calculate the volume of the block Volume: ___________ cm3 2 Use the following information to answer questions 17,18 and 19 below. A student has been given solid metal strips and a beaker of acid. She pours exactly 50.0 mL of acid into a flask. She uses an electronic balance to measure a metal strip of 50.0 g and adds it to the flask. She uses the apparatus to the right to collect and measure the hydrogen gas produced under a standard pressure of 1 atmosphere. metal strip in acid The student continues her experiment using 20.0 g, 10.0 g, and 5.0 g metal strips. She carefully measures and records the volume of gas formed each time. The data table is shown below. Mass of solid (g) Pressure (atm) Volume of gas (mL) 50.0 1.00 83.0 20.0 1.00 34.7 10.0 1.00 18.3 5.0 1.00 8.9 50.0 76.50 23.8 17. What is the independent variable in this experiment? _________________ 18. What is the dependent variable in this experiment? __________________ 19. What is the controlled variable in this experiment? _____________________ Explain: ______________________________________________________________________ 20. A student completed an experiment measuring the mass and volume of a solid. The student plotted four data points on a graph of Mass vs. Volume shown below: M V What property does the slope of the best fit line represent about the solid: ___________ 3