Match metals in column A with their chemical symbol in column B. 32. Match materials in column A to their linear coefficient of thermal expansion in column B. 33. Match the items in column A their respective formulas in column B.

Here are the answers to your matching questions:

31. Match metals in column A with their chemical symbol in column B.

• 1. Gold $\rightarrow$ C. Au
• 2. Platinum $\rightarrow$ D. Pt
• 3. Silver $\rightarrow$ B. Ag
• 4. Mercury $\rightarrow$ A. Hg

32. Match materials in column A to their linear coefficient of thermal expansion in column B.

• 1. Iron $\rightarrow$ A. 0.000018 (This value is plausible for some types of steel, e.g., stainless steel.)
• 2. Mercury $\rightarrow$ **C. 0.00