Chemistry 5-2 Review

Match the following numbers to the number of significant figures.

• 4 Sig-Figs

• 2 Sig-Figs

• 31.0

• 1 Sig-Fig

• 0.002000

• 3 Sig-Figs

• 100

• 
• 
• 
• 

Round 0.002451 to 2 significant figures.

Mathematical Equivalence

ON

Round 11.234 to 1 significant figure

Mathematical Equivalence

OFF

How comfortable do you feel with significant figures?

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Calculate the number of grams in 8.10 mol of Carbon (12.01 g/mol)

• 97.3 g C

• 0.674 g C

• 73.9 g C

• 12.0 g C

Calculate the number of molecules in 9.2 mol of N₂ (28.02 g/mol)

Which of the following conversion factors should never be used?

How comfortable do you feel with 1-step and 2-step conversions?

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How many moles of O₂ would you need to make 4.0 mol of H₂O?

• 2.0 mol O₂

• 4.0 mol O₂

• 1.0 mol O₂

• 8.0 mol O₂