Prelab Exercise t observations that indicate a chemical reaction has taken place
ID: 697519 • Letter: P
Question
Prelab Exercise t observations that indicate a chemical reaction has taken place 2. Label each property or change as chemical or physical a) b) c) Color d) Density Sugar dissolves in water Burning of natural gas e) Silver precipitates as a chloride salt 3. A 2.005 sa gram sample of xCuso. yH,0 was heated to drive off water from the hydrated salt. The anhydrous salt weighed 1.283 grams. a. What is the mass of water lost?, b. How many moles of water were lost? C. How many moles of anhydrous salt remain? d, what is the empirical formula for the hydrate? (Ratio xy) . 4. A 1.80 2 gram sample of unknown compound contains 0.721 grams of carbon, 0.121 grams of hydrogen and 0.960 grams of oxygen. The compound has a molar mass of 180.2 g/mol Determine the empirical formula of the compound and the molecular formula. e QuantitativeExplanation / Answer
1) change in colour, change in state, evolution of gas, change in temperature, formation of precipitate etc
2)a Sugar dissolves in water: physical change
b) burning of natural gas: chemical change
c) colour: physical property
d) density: physical property
e) Silver precipitates as chloride salt: chemical change
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