Unit Conversion and Molar Mass Concepts

The video tutorial covers the application of SI prefixes in scientific measurements, focusing on unit conversions. It explains the basic rules for converting between different units, such as kilograms to grams and micrograms to kilograms. The tutorial includes examples of converting parts per billion to parts per million, ethanol concentration, and calculating the mass of lead nitrate and cadmium in solutions. The video emphasizes understanding the conversion factors and the importance of using the correct units.

What is the basic rule when converting from a smaller unit to a larger unit?

• Subtract 1000 from the smaller unit

• Add 1000 to the smaller unit

• Divide the smaller unit by 1000

• Multiply the smaller unit by 1000

How many grams are there in 2.5 kilograms?

• 250 grams

• 25000 grams

• 25 grams

• 2500 grams

When converting micrograms to kilograms, what is the first step?

• Divide by 1000

• Add 6 zeros

• Move the decimal point 6 places to the left

• Multiply by 1000

What is the conversion factor when changing parts per billion to parts per million?

• Subtract 1000

• Add 1000

• Divide by 1000

• Multiply by 1000

If a solution has 4000 parts per billion, how many parts per million is that?

• 4 parts per million

• 40 parts per million

• 0.4 parts per million

• 400 parts per million

What is the molar mass of ethanol used in the conversion example?

• 44 grams per mole

• 32 grams per mole

• 28 grams per mole

• 50 grams per mole

How do you convert micro moles per liter to parts per million?

• Subtract the molar mass and multiply by 1000

• Multiply by the molar mass and divide by 1000

• Divide by the molar mass and multiply by 1000

• Add the molar mass and divide by 1000

What is the concentration of cadmium in parts per billion if the mass is 0.035 micrograms in a 10 ml sample?

• 78 parts per billion

• 0.78 parts per billion

• 780 parts per billion

• 7.8 parts per billion

How do you convert 10 ml to liters?

• 10 liters

• 1 liter

• 0.01 liters

• 0.1 liters

What is the conversion factor from grams to kilograms?

• Subtract 1000

• Multiply by 1000

• Divide by 1000

• Add 1000