Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 8.85 g8.85 g and has a volume of 0.545 cm30.545 cm3. Gold has a density of 19.3 g/cm319.3 g/cm3 and copper has a density of 8.96 g/cm38.96 g/cm3. Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 8.85 g8.85 g and has a volume of 0.545 cm30.545 cm3. Gold has a density of 19.3 g/cm319.3 g/cm3 and copper has a density of 8.96 g/cm38.96 g/cm3. Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.
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