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Chem 171 F10 Q1 SkillsSafety Density key

Chem 171 F10 Q1 SkillsSafety Density key - Chem 171 Quiz 1...

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Unformatted text preview: Chem 171 Quiz 1 V. A (5 pts each) (Show work , unit, sig fig for full credit) 1. If you must smell a chemical, what is the procedure? Waft the odor under your nose How do you handle poisonous or noxious gases in the lab? Use the fume hood 2. This question refers to the experiment entitled: "DENSITY: A PHYSICAL PROPERTY OF MATTER". Describe the lab procedure used to determine the volume of an object by Archimedes method in two sentences. Weight the object in air and submerged in a liquid. The difference in weight is the weight of the displaced liquid Chem 171 Quiz 1 V. B (5 pts each) (Show work , unit, sig fig for full credit) 1. Name five laboratory dress regulations. no shorts, no open toed shoes, no bare midriffs, goggles warn at all times, long hair tied back, etc. 2. This question refers to the experiment entitled: "DENSITY: A PHYSICAL PROPERTY OF MATTER". Describe the lab procedure used to determine the volume of an object by displacement in two sentences. Measure the volume of liquid in a container then add the object and remeasure. The difference is the volume. Chem 171 Quiz 1 V. C (5 pts each) (Show work , unit, sig fig for full credit) 1. Carry out the following calculations to the correct number of significant figures. Show work. 5.6792 m +0.6m+4.33 m 5.6792 0.6 4.33 10.6(092) 4.51 cm x 3.6666 cm 16.5 (4.51 has 3 sf) 2. Define Density. The ratio between mass and volume Give two reasons why oil floats on water. Oil is less dense than water and oil doesn't mix with water Chem 171 Quiz 1 V. D (5 pts each) (Show work , unit, sig fig for full credit) 1. Determine the number of significant figures in each of the following five measurements: 2. 0.006 L 1 0.0605 dm 3 60.5 cm 3 605.5 cm2 4 9.60 x 103 g 3 What is the SIderived unit for density? kg/m3 What is sensitivity? How fine a scale the equipment uses Chem 171 Quiz 1 V. E (5 pts each) (Show work , unit, sig fig for full credit) 1. Identify the following lab equipment: Watch glass crucible tongs 2. The density of platinum is 21.5 g / cm 3. Calculate the volume of 87.6 g of platinum at this temperature? Show equation. 87.6g/21.5g/cm3 = 4.07 cm3 Does the density change with temperature? Explain. Yes. Volume changes with temperature, so the density does. ...
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