Significant Figures Activity - Georgetown High School



Significant Figures Activity

Objective: To apply and understand significant figures.

Data:

|Stat- |Measuring Device |Object |# of Decimal Places Tool Can Report |Reading |# of |

|ion | | | | |sig figs |

|1 |100 mL graduated cylinder |colored water |1 decimal place |mL | |

|2 |25 mL graduated cylinder |colored water | |mL | |

|3 |50 mL beaker |colored water | |mL | |

|4 |Electronic balance “A” |block | |g | |

|5 |Electronic balance “B” |block | |g | |

|6 |Alcohol thermometer |water | |°C | |

|7 |Temperature probe |water | |°C | |

|8 |Ruler “A” |block | |cm | |

|9 |Ruler “B” |block | |cm | |

Conclusion Questions:

1. What determines the accuracy of a measurement?

2. What determines the precision of a measurement?

3. Which of the instruments used during this activity gave you the most accurate and precise value for the following measurements?

a. volume of a liquid b. mass

c. temperature d. length

4. Calculate the following and express answers with correct number of significant figures.

a. 59.67g + 3.1g=___________ b. 9mL + 2.5mL + 2.24mL=____________

c. 100.4°C - 91°C=____________ d. 13.45cm + 6.7cm=____________

5. Calculate the following and express answers with correct number of significant figures.

a. 54.67g/2.31mL=____________ b. 52.0g/4.1mL=____________

d. 4.56cm X 13.84cm=____________ c. 13cm X 13.4cm X 13.67cm=____________

6. Calculate the following and express answers with correct number of significant figures. Remember that there is no uncertainty in a conversion factor. Show all work using dimensional analysis!

a. It is 35 miles from your house to the nearest movie theater. What is this distance expressed in km?

(1 mile = 1.6093 kilometers)

b. The mass of a book is 15.0 kilograms, what is this expressed in nanograms?

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