Questions and Answers of Chemistry And Chemical Reactivity

A solar panel is pictured in the photo. When light shines on the panel, it generates an electric current that can be used to recharge the batteries in an electric car. What types of energy are
Which part of the description of a compound or element refers to its physical properties and which to its chemical properties? (a). Calcium carbonate is a white solid with a density of 2.71 g/cm3.
Which part of the description of a compound or element refers to its physical properties and which to its chemical properties? (a). The colorless liquid ethanol burns in air.(b). The shiny metal
Determine whether kinetic energy is being converted to potential energy, or vice versa, in the following processes. (a). Water cascades downward in a waterfall.(b). A player kicks a football.(c). An
Determine which of the following represent potential energy and which represent kinetic energy. (a). Thermal energy(b). Gravitational energy(c). Chemical energy(d). Electrostatic energy
A hot metal block is plunged into water in a well-insulated container. The temperature of the metal block goes down, and the temperature of the water goes up until their temperatures are the same. A
A book is held at a height above the floor. It has a certain amount of potential energy. When the book is released, its potential energy is converted to kinetic energy as it falls to the floor. The
A piece of turquoise is a blue-green solid; it has a density of 2.65 g/cm3 and a mass of 2.5 g. (a). Which of these observations are qualitative and which are quantitative?(b). Which of the
Iron pyrite (fool’s gold) has a shiny golden metallic appearance. Crystals are often in the form of perfect cubes. A cube 0.40 cm on each side has a mass of 0.064 g. (a). Which of these
The mineral fluorite contains the elements calcium and fluorine and can have various colors, including blue, violet, green, and yellow (a). What are the symbols of these elements? (b). How would
Which observations below describe chemical properties? (a). Sugar is soluble in water. (b). Water boils at 100 °C.(c). Ultraviolet light converts O3 (ozone) to O2 (oxygen). (d). Ice is less dense
Which observations below describe chemical properties?(a). Sodium metal reacts violently with water.(b). The combustion of octane (a compound in gasoline) gives CO2 and H2O.(c). Chlorine is a green
Small chips of iron are mixed with sand (see photo). Is this a homogeneous or heterogeneous mixture? Suggest a way to separate the iron from the sand. Chips of iron mixed with sand ⒸCengage
Azurite, a blue, crystalline mineral, is composed of copper, carbon, and oxygen.(a) What are the symbols of the three elements that combine to make the mineral azurite?(b) Based on the photo,
You have a solution of NaCl dissolved in water. Describe a method by which these two compounds could be separated.
Identify the following as either physical changes or chemical changes. (a). Dry ice (solid CO2) sublimes (converts directly from solid to gaseous CO2). (b). Mercury’s density decreases as the
In Figure 1.5 you see macroscopic and particulate views of the element bromine. Which are the macroscopic views and which are the particulate views? Describe how the particulate views explain
Identify the following as either physical changes or chemical changes.(a). The desalination of sea water (separation of pure water from dissolved salts).(b). The formation of SO2 (an air pollutant)
The following photo shows copper balls, immersed in water, floating on top of mercury. What are the liquids and solids in this photo? Which substance is most dense? Which is least dense? Water,
Categorize each of the following as an element, a compound, or a mixture. (a). Air (b). Fluorite (c). Brass (d). 18-carat gold
Categorize each of the following as an element, a compound, or a mixture. (a). Sterling silver(b). Carbonated mineral water(c). Tungsten(d). Aspirin
Make a drawing, based on the kinetic-molecular theory and the ideas about atoms and molecules presented in this chapter, of the arrangement of particles in each of the cases listed here. For each
Make a drawing, based on the kinetic-molecular theory and the ideas about atoms and molecules presented in this chapter, of the arrangement of particles in each of the cases listed here. For each
Hexane (C6H14, density = 0.766 g/cm3), perfluorohexane (C6F14, density = 1.669 g/cm3), and water are immiscible liquids; that is, they do not dissolve in one another. You place 10 mL of each in a
You have a sample of a white crystalline substance from your kitchen. You know that it is either salt or sugar. Although you could decide by taste, suggest another property that you could use to
You can figure out whether a solid floats or sinks if you know its density and the density of the liquid. In which of the liquids listed below will high-density polyethylene (HDPE) float? (HDPE, a

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