Conversions and Calculations in Science

The video tutorial covers dimensional analysis, including converting units such as km/h to km/s and miles/s, calculating costs using conversion factors, and performing density calculations. It also explains how to calculate percent error in measurements. The focus is on setting up problems correctly using dimensional analysis rather than basic math skills.

What is the first step in converting 134.4 km/h to km/s using dimensional analysis?

• Divide by 1000 to convert kilometers to meters

• Multiply by 60 to convert hours to minutes

• Write the given value as a fraction

• Convert kilometers to miles

When converting km/h to miles/s, what is the conversion factor between kilometers and miles?

• 1 km = 2 miles

• 1 km = 1.61 miles

• 1 km = 0.5 miles

• 1 km = 0.621 miles

In the egg cost calculation, what is the conversion factor used for a dozen eggs?

• 1 dozen = 12 eggs

• 1 dozen = 15 eggs

• 1 dozen = 20 eggs

• 1 dozen = 10 eggs

How do you calculate density if given mass and volume?

• Multiply mass by volume

• Divide mass by volume

• Add mass and volume

• Subtract volume from mass

What is the density of a substance with a mass of 83.4 g and a volume of 45.6 mL?

• 1.83 g/mL

• 2.00 g/mL

• 2.50 g/mL

• 1.50 g/mL

If given a density value, how should it be used in dimensional analysis?

• As a multiplication factor

• As a division factor

• As a conversion factor

• As an addition factor

What is the formula for calculating percent error?

• Sum of values divided by accepted value, times 100

• Difference between values divided by accepted value, times 100

• Sum of values divided by experimental value, times 100

• Difference between values divided by experimental value, times 100

In percent error calculation, which value should be placed in the denominator?

• Experimental value

• Accepted value

• Average value

• Maximum value

What is the percent error if the experimental density is 3.45 g/mL and the accepted density is 3.60 g/mL?

• 4.17%

• 3.75%

• 5.00%

• 2.50%

Why is it important to use absolute values in percent error calculations?

• To simplify the formula

• To avoid negative numbers

• To make calculations easier

• To ensure the error is always positive