Dimensional Analysis Review

How many significant figures: 153.0 mL

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How many significant figures: 1000 mL

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How many significant figures: 0.012 km

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How do you know where to round your answer when completing dimensional analysis problems?

• You can round anywhere.

• Round to the same number of significant figures as your original measurement.

• Always round to the nearest whole number.

• Round to the number of significant figures in your conversion factor.

Sally is using dimensional analysis to determine how many milliliters are in 2.45 L. Her answer is 2,500 mL.

Is this answer correct? If not, explain why.

• Yes

• No, the units are missing

• No, it is not rounded to the correct number of significant figures

• No, the units are missing and it is not rounded to the correct number of significant figures

Mark walks 1.3 miles to get home each day from school. He is asked to use dimensional analysis to determine this distance in kilometers (1 km = 0.621 mi). After he solves the problem, he answers 2.1

Is this answer correct? If not, why?

• Yes

• No, the units are missing

• No, it is not rounded to the correct number of significant figures

• No, the units are missing and it is not rounded to the correct number of significant figures

Which of the following conversion factors could you use to convert between g and kg?

•  $\frac{1\ kg}{1000\ g}$ 

•  $\frac{1000\ kg}{1\ g}$ 

•  $\frac{100\ g}{1\ kg}$ 

•  $\frac{10\ kg}{1\ g}$ 

Which of the following conversion factors could you use to convert between L and mL?

• $\frac{1\ mL}{1000\ L}$

• $\frac{1000\ mL}{1\ L}$

• $\frac{100\ mL}{1\ L}$

• $\frac{10\ L}{1\ mL}$

How many liters are in 34.72 mL?

• 0.03472 L

• 34,720 L

• 3,472 L

• 0.34720 L

How many gallons are in a pool that holds 830,000 Liters?

(1 gallon = 3.79 Liters)

• 200,000 gal

• 3,100,000 gal

• 220,000 gal

• 3,000,000 gal