Chemistry > QUESTIONS & ANSWERS > CHEM 120 Unit 4 Midterm (Practice Problems) (100% Correct Solutions) (All)
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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