Textbook Question
Saline solution used in hospital contains 0.9% sodium chloride by mass. Calculate the number of grams of sodium chloride in 0.5 gal of saline solution if the solution has a density of 1.01 g/mL.
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Ch.1 - Introduction: Matter, Energy, and Measurement
Chapter 1, Problem 90b
Gold is alloyed (mixed) with other metals to increase its hardness in making jewelry. (b) The relative amount of gold in an alloy is commonly expressed in units of carats. Pure gold is 24 carat, and the percentage of gold in an alloy is given as a percentage of this value. For example, an alloy that is 50% gold is 12 carat. State the purity of the gold jewelry in carats.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alloy Composition
An alloy is a mixture of two or more metals, where the properties of the resulting material differ from those of the individual components. In jewelry, gold is often alloyed with metals like copper or silver to enhance its hardness and durability. The composition of an alloy is crucial for determining its physical properties and applications.
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04:19
Matter Composition
Carat System
The carat system is a unit of measurement used to express the purity of gold. Pure gold is defined as 24 carats, meaning it contains 100% gold. The carat value decreases as the proportion of gold in the alloy decreases, allowing for a straightforward way to communicate the quality of gold in jewelry.
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Percentage Calculation
Understanding percentage calculations is essential for determining the carat value of gold alloys. The percentage of gold in an alloy can be converted to carats by using the formula: Carats = (Percentage of Gold / 100) * 24. This relationship allows jewelers and consumers to assess the quality and value of gold jewelry based on its gold content.
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Related Practice
Textbook Question
A 40-lb container of peat moss measures 14 * 20 * 30 in. A
40-lb container of topsoil has a volume of 1.9 gal. (b) How many bags of peat moss are needed to
cover an area measuring 15.0 ft * 20.0 ft to a depth of 3.0 in.?
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Textbook Question
The total rate at which power is used by humans worldwide
is approximately 15 TW (terawatts). The solar flux averaged
over the sunlit half of Earth is 680 W>m2 (assuming
no clouds). The area of Earth's disc as seen from the Sun is
1.28 * 1014 m2. The surface area of Earth is approximately
197,000,000 square miles. How much of Earth's surface
would we need to cover with solar energy collectors to power
the planet for use by all humans? Assume that the solar energy
collectors can convert only 10% of the available sunlight
into useful power
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (a) Air and water are both elements.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (b) All mixtures contain at least one element and one compound.
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Textbook Question
Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (c) Compounds can be decomposed into two or more other substances; elements cannot.
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