28. Which of the following is broken when water evaporates?
A. Nonpolar covalent bonds
B. Ionic Bonds
C. Hydrogen Bonds
D. Polar Covalent Bonds
29. You are asked to indicate the type and number of atoms in molecules. Which representation would work?
A. Molecular formula
B. Structural formula
C. Ball and stick model
D. Space fitting model
30. Which of the following correctly describes chemical equilibrium?
A. Forward and reverse reactions continue with no net effect on the concentrations of the reactants and the products.
B. Concentrations of products are higher than the concentration of the reactants.
C. There are equal concentrations of products and reactants while forward and reverse reactions continue.
D. There are equal concentrations of reactants and products, and the reactions have stopped.
31. To act as an effective coolant in a car's radiator, a substance has to have the capacity to absorb a great deal of heat. You have a reference with tables listing the physical properties of many liquids. In choosing a coolant for your car, which table would you check first?
A. pH
B. Density at room temperature
C. Heat of vaporization
D. Specific heat
32. Water has many exceptional and useful properties. Which is the rarest property among compounds?
A. Water is a solvent
B. Solid water is less dense than liquid water
C. Water has high heat capacity
D. Water has surface tension
28. Which of the following is broken when water evaporates?
A. Nonpolar covalent bonds
B. Ionic Bonds
C. Hydrogen Bonds
D. Polar Covalent Bonds
29. You are asked to indicate the type and number of atoms in molecules. Which representation would work?
A. Molecular formula
B. Structural formula
C. Ball and stick model
D. Space fitting model
30. Which of the following correctly describes chemical equilibrium?
A. Forward and reverse reactions continue with no net effect on the concentrations of the reactants and the products.
B. Concentrations of products are higher than the concentration of the reactants.
C. There are equal concentrations of products and reactants while forward and reverse reactions continue.
D. There are equal concentrations of reactants and products, and the reactions have stopped.
31. To act as an effective coolant in a car's radiator, a substance has to have the capacity to absorb a great deal of heat. You have a reference with tables listing the physical properties of many liquids. In choosing a coolant for your car, which table would you check first?
A. pH
B. Density at room temperature
C. Heat of vaporization
D. Specific heat
32. Water has many exceptional and useful properties. Which is the rarest property among compounds?
A. Water is a solvent
B. Solid water is less dense than liquid water
C. Water has high heat capacity
D. Water has surface tension
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