CHEM 120 Unit 4 Midterm (Practice Problems) (100% Correct Solutions)

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1. Identify each of the following as a substance or a mixture.  a. helium gas used to fill a balloon o substance  b. the juice squeezed from an orange o substance-mixture  c. distilled w ... ater o substance  d. carbon dioxide gas o mixture-substance *mixtures can be broken down into original components 2. Which of the following mixtures are homogeneous and which are heterogeneous?  a. copper water pipe o homo  b. distilled water o homo  c. liquid oxygen o homo  d. chicken noodle soup o hetero 3. Change the unit for each of the following measurements by replacing the power of ten with an appropriate SI prefix.  a.8.01 × 10–6 g o .00000801-8.01 ug  b.7.9 × 10–3 L o .0079- 7.9 mL  c.1.05 × 103 m o 1050-1.05 km 4. Carry out the following conversions.  a.37.4 mL to L o 0.0374 L  b.1.55 × 102 km to m o 0.15 m-1.55x105 m  c.0.198 g to mg o 198 mg  d.1.19 m2 to cm2 o 5. How many millimeters are there in 1.00 cm? In 1.83 m? 10 mm; 1830 mm 6. What is the density, in grams per milliliter, of (a) a salt solution if 37.5 mL has a mass of 43.75 g and (b) 2.75 L of th [Show More]

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