Dimensional Analysis and Scientific Notation Quiz

Which of the following is a correct conversion factor for milliliters to liters?

• 1 mL = 100 L

• 1 mL = 0.001 L

• 1 mL = 0.01 L

Why is scientific notation useful in chemistry?

• It simplifies calculations involving very large or very small numbers.

• It avoids the need for using significant figures.

• It eliminates the need for conversion factors.

Convert 25.0 grams to kilograms.

• 0.025 kg

• 2.50 kg

• 250 kg

A chemistry student needs to convert 5.3 km to meters. Which of the following conversion factors should they use?

• 1 km=10 m

• 1 km=1,000 m

• 1 km=100 m

Which of the following best explains why dimensional analysis is important in chemistry?

• It ensures correct unit conversions in chemical calculations.

• It reduces the number of calculations required for an experiment.

• It replaces the need for balanced chemical equations.

Convert 2.5 moles of a substance to particles using Avogadro’s number (6.022×10^23 particles/mole).

• 1.505×10^24 particles

• 6.022×10^23 particles

• 2.5×10^23 particles

A sample has a volume of 1500 mL. Convert this to liters.

• 1.5 L

• 15 L

• 0.15 L

Which of the following conversions is incorrect?

• 1 inch=2.54 cm

• 1 g=1000 mg

• 1 L=1000 cm^3

A student is given a substance with a density of 0.8 g/mL and a mass of 400 g. What is the best way to determine its volume?

• Multiply mass by density

• Divide mass by density

• Add mass and density

A chemist reports a value in scientific notation as 4.56×10^5. What is the standard notation of this number?

• 45,600

• 456,000

• 4,560,000