Chemistry Equations

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Graded Assignment Name: SCI302A: Chemistry | Unit 7 | Lesson 4: Semester Test Date: Graded Assignment Semester Test, Part 2 Answer the following questions. You may use the periodic table in the Chemistry: Problems and Solutions book for this test. When you have finished, submit this assignment to your teacher by the due date for full credit. (5 points) 1. You have 2 m3 of a mineral ore sample. It has a mass of 1 × 104 kg. Calculate the density of the ore sample and express your results in g/cm 3 with appropriate scientific notation. Score Answer: (5 points) 2. Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to make it conform to reality. Score Answer: (5 points) 3. Methane (CH4), ammonia (NH3), and oxygen (O2) can react to form hydrogen cyanide (HCN) and water according to this equation: Score CH4 + NH3 + O2 → HCN + H2O You have 8 g of methane and 10 g of ammonia in excess oxygen. Answer the following questions: • What is the balanced equation for this reaction? • Which reagent is limiting? Explain why. • How many grams of hydrogen cyanide will be formed? Show your work. © 2008 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. Page 1 of 2 Graded Assignment SCI302A: Chemistry | Unit 7 | Lesson 4: Semester Test Answer: (5 points) 4. In your own words, explain the periodic law. Score Answer: Your Score © 2008 K12 Inc. All rights reserved. Copying or distributing without K12’s written consent is prohibited. ___ of 20 Page 2 of 2
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