Chapter 1: Problem 87
Classify each of the following as a mixture or a pure substance. a. water b. blood c. the oceans d. iron e. brass f. uranium g. wine h. leather i. table salt Of the pure substances, which are elements and which are compounds?
Chapter 1: Problem 87
Classify each of the following as a mixture or a pure substance. a. water b. blood c. the oceans d. iron e. brass f. uranium g. wine h. leather i. table salt Of the pure substances, which are elements and which are compounds?
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Get started for freePerform the following mathematical operations, and express each result to the correct number of significant figures. a. \(\frac{0.102 \times 0.0821 \times 273}{1.01}\) b. \(0.14 \times 6.022 \times 10^{23}\) c. $4.0 \times 10^{4} \times 5.021 \times 10^{-3} \times 7.34993 \times 10^{2}$ d. \(\frac{2.00 \times 10^{6}}{3.00 \times 10^{-7}}\)
Which characteristics of a solid, a liquid, and a gas are exhibited by each of the following substances? How would you classify each substance? a. a bowl of pudding b. a bucketful of sand
The properties of a mixture are typically averages of the properties of its components. The properties of a compound may differ dramatically from the properties of the elements that combine to produce the compound. For each process described below, state whether the material being discussed is most likely a mixture or a compound, and state whether the process is a chemical change or a physical change. a. An orange liquid is distilled, resulting in the collection of a yellow liquid and a red solid. b. A colorless, crystalline solid is decomposed, yielding a pale yellow-green gas and a soft, shiny metal. c. A cup of tea becomes sweeter as sugar is added to it.
Consider the addition of 15.4 to 28. What would a mathematician say the answer is? What would a scientist say? Justify the scientist’s answer, not merely citing the rule, but explaining it.
Which of the following are chemical changes? Which are physical changes? a. the cutting of food b. interaction of food with saliva and digestive enzymes c. proteins being broken down into amino acids d. complex sugars being broken down into simple sugars e. making maple syrup by heating maple sap to remove water through evaporation f. DNA unwinding
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