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HW 10-8-08

HW 10-8-08 - with a certain mass of the first element is...

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Joseph Leonard Green P87 #1-3 10/8/08 1. Explain each of the following in terms of Dalton’s atomic theory: a. the law of conservation of mass b. the law of definite proportions c. the law of multiple proportions a. states that mass in neither created nor destroyed during ordinary chemical reaction or physical changes. b. a chemical compound contains the same elements in exactly the same proportions by mass regardless of size of the sample or source of the compound. c. if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined
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Unformatted text preview: with a certain mass of the first element is always a ratio of small whole numbers. 2. According to the law of conservation of mass, if element A has an atomic mass of 2 mass units and element B has an atomic mass of 3 mass units, what mass would be expected for compound AB? For compound A 2 B 3 ? AB – 5 mass units A 2 B 3 – 13 mass units 3. a) What is an atom? The smallest unit of matter that maintains its properties b) What two regions make up all atoms? The nucleus and the electron cloud...
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