Three Lab Reports with pre/post lab questions answered for General Chemistry

 Draw an electron dot diagram for methane.

Use Figure 9 and the periodic table (Figure 2) to construct a hypothesis about the melting points of stearic acid and sodium chloride. How will they compare, and how does that relate to the bonds that hold atoms in the compounds together?

Figure 9: Structure of Stearic Acid

experiment 1: Structural Models

Data Sheet

Table 1: Structural Models Data

Table 2: Compound Models Data

Post-Lab Questions

1. Describe the differences between covalent and ionic bonds.

Use the periodic table to describe which elements form ionic bonds, and which elements form covalent bonds.

experiment 2: melting points and types of bonds

Data Sheet

Table 3: Melting Point Data

Post-Lab Questions

1. Which compound melted first? Did this agree with your prediction from Pre-Lab Question 2? Explain why or why not.

1. Did any bubbling compounds release an odor or undergo a color change?

1. Which of the three samples in these experiments have covalent bonds? Which samples have ionic bonds? Explain your answer using data from the experiment.

1. What did stearic acid look like before and after it was exposed to heat? Use the law of conservation of matter to explain your answer.

1. Use the concept of melting point to explain why some plastics can’t be used to microwave food.