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# Density exercises

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### Density exercises

1. 1. COLEGIO BRITÁNICO INTERNACIONAL SCIENCE DENSITY EXERCISESINFORMATION REQUIRED FOR HOMEWORK: Table 1.- Densities of Common SubstancesSubstance Density (g/cm3) Substance Density (g/cm3)Helium (gas) 0.0001663 Zinc (solid) 7.13Oxygen (gas) 0.001331 Silver (solid) 10.50Water (liquid) 1.00 Lead (solid) 11.35Pyrite (solid) 5.02 Mercury (liquid) 13.55Gold (solid) 19.32 Iron (solid) 7.9Tin (solid) 7.3How to convert Mass into Weight: 1 N = 100 gEXAMPLE:A student has a mass of 45,000 g. how much does this student weigh in Newtons?STEP 1: Write the information given to you. 45,000 gSTEP 2: Write the conversion factor to change grams into newtons. 1 N = 100 gSTEP 3: Write the equation so that grams will cancel. 45,000 g x = 450 N
2. 2. How to calculate Volume:How to calculate Density:D= DensityM= MassV= VolumeEXAMPLE:What is the density of an object whose mass is 25 g and whose volume is 10 cm3?STEP 1: Write the equation for density.STEP 2: Replace m and V with the measurements given in the problem, and solve. = = 2.5EXERCISES:1. Suppose you have a lead ball whose mass is 454 g. What is the ball´s volume?2. What is the mass of 15 mL sample of mercury?3. What is the density of an object that has a mass of 350 g and a volume of 95 cm3? Would this object float in water? Explain.