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Chapter 1: Problem 77

Classify each of the following as a mixture or a pure substance. a. water f. uranium b. blood g. wine c. the oceans h. leather d. iron i. table salt e. brass Of the pure substances, which are elements and which are compounds?

Short Answer

Expert verified
Water, iron, uranium, and table salt are pure substances. Blood, the oceans, brass, wine, and leather are mixtures. Among the pure substances, water and table salt are compounds while iron and uranium are elements.

Step by step solution

01

Classify each substance as a pure substance or mixture

Based on the definitions we discussed, we can classify each substance as follows: a. water - Pure substance b. blood - Mixture c. the oceans - Mixture d. iron - Pure substance e. brass - Mixture f. uranium - Pure substance g. wine - Mixture h. leather - Mixture i. table salt - Pure substance
02

Identify pure substances as elements or compounds

Now, we will identify the pure substances found in Step 1 as either elements or compounds: a. water (H2O) - Compound (formed by hydrogen and oxygen) d. iron (Fe) - Element (cannot be broken down into simpler substances) f. uranium (U) - Element (cannot be broken down into simpler substances) i. table salt (NaCl) - Compound (formed by sodium and chlorine) In conclusion, water and table salt are compounds, while iron and uranium are elements. The other substances are mixtures.

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Most popular questions from this chapter

When a marble is dropped into a beaker of water, it sinks to the bottom. Which of the following is the best explanation? a. The surface area of the marble is not large enough to be held up by the surface tension of the water. b. The mass of the marble is greater than that of the water. c. The marble weighs more than an equivalent volume of the water. d. The force from dropping the marble breaks the surface tension of the water. e. The marble has greater mass and volume than the water. Justify your choice, and for choices you did not pick, explain what is wrong about them.

Precious metals and gems are measured in troy weights in the English system: \(\begin{aligned} 24 \text { grains } &=1 \text { pennyweight (exact) } \\ 20 \text { pennyweight } &=1 \text { troy ounce (exact) } \\ 12 \text { troy ounces } &=1 \text { troy pound (exact) } \\ 1 \text { grain } &=0.0648 \text { gram } \\ 1 \text { carat } &=0.200 \mathrm{gram} \end{aligned}\) a. The most common English unit of mass is the pound avoirdupois. What is one troy pound in kilograms and in pounds? b. What is the mass of a troy ounce of gold in grams and in carats? c. The density of gold is \(19.3 \mathrm{~g} / \mathrm{cm}^{3} .\) What is the volume of a troy pound of gold?

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Convert the following Kelvin temperatures to Celsius and Fahrenheit degrees. a. the temperature that registers the same value on both the Fahrenheit and Celsius scales, \(233 \mathrm{~K}\) b. the boiling point of helium, \(4 \mathrm{~K}\) c. the temperature at which many chemical quantities are determined, \(298 \mathrm{~K}\) d. the melting point of tungsten, \(3680 \mathrm{~K}\)

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