1.Brass is an alloy of copper and zinc. Varying the mass per-centages of the two metals produces brasses with different prop-erties. A brass called yellow zinchas high ductility and strengthand is 34%–37% zinc by mass. (a) Find the mass range (in g) of copper in 185 g of yellow zinc. (b) What is the mass range (in g)of zinc in a sample of yellow zinc that contains 46.5 g of copper?
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.
1.Brass is an alloy of copper and zinc. Varying the mass per-centages of the two metals produces brasses with different prop-erties. A brass called yellow zinchas high ductility and strengthand is 34%–37% zinc by mass. (a) Find the mass range (in g) of copper in 185 g of yellow zinc. (b) What is the mass range (in g)of zinc in a sample of yellow zinc that contains 46.5 g of copper?
2. Galena, a mineral of lead, is a compound of the metal withsulfur. Analysis shows that a 2.34-g sample of galena contains2.03 g of lead. Calculate the (a) mass of sulfur in the sample;(b) mass fractions of lead and sulfur in galena; (c) mass percentsof lead and sulfur in galena.
3. When 56.6 g of calcium and 30.5 g on nitrogen gas undergo a reaction that has a 93.0%yield, what mass (g) of calcium nitride forms?
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