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Chapter 3 Unit Review 1. You have a 78 g sample of a compound of which 12.4 g is hydrogen. What is the % by mass of hydrogen in the sample?
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2. A sample is made-up of 1 g hydrogen and 19 g fluorine. What is the % by mass of hydrogen in the sample.
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3. When 3.5 g of X reacts with 10.5 g Y to form a compound of XY, what is the % by mass of X in this sample? What is the % by mass of Y is this sample?
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4. Two different compounds made up of the same elements but is different proportions, (different masses) is governed by what Law: ans: Law of Multiple Proportions
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5. Given two compounds. Compound one has 15g hydrogen and 120 g oxygen. Compound two has 2 g hydrogen and 32 g oxygen. Are the two compounds the same?
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6. You have a sample compound made up of 18.06 g magnesium and 6.96 g oxygen, what is the % by mass of oxygen in the sample?
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7. Compound one: 4.82 g carbon and 6.44 g oxygen. Compound two: 20.13 g carbon and 53.7 g oxygen. What is the ratio of the 2 compounds?
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8. Compound one: 6.46 g lead and 1 g oxygen. Compound two: 68.54 g lead and 28.76 g oxygen. Are the two compound the same?
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9. Compound one: 5.753 g chlorine and 9.248 g fluorine. What is the % by mass of chlorine? What is the % by mass of fluorine?
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10. Given 20 g sample of sucrose. 8.44 g carbon, 1.30 g hydrogen and 10.26 g oxygen. What is the % by mass of each element?
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11. Given a 500 g sample of an unknown that contains 32.5 g hydrogen, 256.5 g oxygen and an unknown amount of carbon. Is the compound sucrose? Look at #10.
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12. Given N 2 + 3H 2 2NH 3 with 28 g nitrogen and 6 g hydrogen, what is the mass of NH 3 ?
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Any additional problems?
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13. Are the following physical or chemical properties? Conducts electricity Boils at 85 o C Colorless Remains unchanged when reacting with oxygen Liquid at room temperature Condensing Vaporizing Exploding Fermentation Tarnishing Grinding
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14. Are the following heterogeneous mixtures or homogeneous mixtures? Alloy wheels Salad dressing Pizza Air Salt water Blood Concrete mix
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15. Identify each as true or false: Solids have a defined shape and volume? Density for the same matter is always the same? Density is an extensive physical property? Transfer of energy indicates a chemical change? Latex paint is a heterogeneous mixture? Solutions are all homogeneous mixtures? Water contracts when heated? Gas production indicates a physical change?
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16. Is it a chemical or physical change when ice melts to water? ans: physical 17. Is mass and length of an object intensive or extensive physical properties? ans: extensive 18. Is energy in or energy out required for a liquid to freeze? ans: energy out
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19. Is distillation a chemical or physical changing process? ans: physical 20. What is the physical state of matter that has a defined volume with no defined shape? ans: liquid 21. The separation of a mixture by passing the mixture through a semi-permeable membrane is called ______________ ans: filtration
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22. Matter is neither created nor destroyed but can change in form, is what Law? ans: Law of the Conservation of Matter 23. The combination of two or more elements is called a (n) : ans: compound 24. A gas that normally exists as a liquid at room temperature is called a(n) : ans: vapor
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25. Two elements combine in a fixed ration by mass is called: ans: Law of Definite Proportions 26. Different compound can be formed from the same elements in different proportions by mass as long as the ratio between the two compounds are a small whole number? ans: Law of Multiple Proportions 27. Matter that has a uniform and unchanging composition is ans: a substance
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