Q: Which of the following is the correct conversion factor to change kilometers to meters?

$$1 \text{ km} = 1000 \text{ m}$$

Q: A scientist measures the circumference of the Earth as 40,075 km. What is this value in meters?

$$40,075 \text{ km} \times 1000 = 40,075,000 \text{ m}$$

Q: If a chemical reaction requires 2.5 liters of solution, how many milliliters does this represent?

$$2.5 \text{ L} \times 1000 = 2500 \text{ mL}$$

Q: A student needs to convert 5000 milligrams to grams for a lab experiment. What is the correct conversion?

$$5000 \text{ mg} \div 1000 = 5 \text{ g}$$

Q: A medical dosage is prescribed as 0.75 grams. How many milligrams is this?

$$0.75 \text{ g} \times 1000 = 750 \text{ mg}$$

Q: A chemistry student needs to convert 2.1 x $$10^3$$ centimeters to meters. What is the correct answer?

$$2.1 \times 10^3$ \text{ cm} \div 100 = 21 \text{ m}$$

Q: A laboratory sample has a mass of 1.2 kilograms. How many grams is this?

$$1.2 \text{ kg} \times 1000 = 1200 \text{ g}$$

Q: A student is asked to convert 0.0035 meters to millimeters. What is the correct answer?

$$0.0035 \text{ m} \times 1000 = 3.5 \text{ mm}$$

Q: A solution contains 0.25 liters. How many microliters does this represent?

$$0.25 \text{ L} \times 1,000,000 = 250,000 \text{ \mu L}$$

Question 1

Which of the following is the correct conversion factor to change kilometers to meters?

Accepted Answer

$$1 	ext{ km} = 1000 	ext{ m}$$

Question 2

A scientist measures the circumference of the Earth as 40,075 km. What is this value in meters?

Accepted Answer

$$40,075 	ext{ km} 	imes 1000 = 40,075,000 	ext{ m}$$

Question 3

If a chemical reaction requires 2.5 liters of solution, how many milliliters does this represent?

Accepted Answer

$$2.5 	ext{ L} 	imes 1000 = 2500 	ext{ mL}$$

Question 4

A student needs to convert 5000 milligrams to grams for a lab experiment. What is the correct conversion?

Accepted Answer

$$5000 	ext{ mg} \div 1000 = 5 	ext{ g}$$

Question 5

Which of the following best describes the importance of using SI units in scientific measurements?

Accepted Answer

SI units provide a standardized system that allows scientists worldwide to communicate results accurately.

Question 6

A medical dosage is prescribed as 0.75 grams. How many milligrams is this?

Accepted Answer

$$0.75 	ext{ g} 	imes 1000 = 750 	ext{ mg}$$

Question 7

A chemistry student needs to convert 2.1 x $$10^3$$ centimeters to meters. What is the correct answer?

Accepted Answer

$$2.1 	imes 10^3$ 	ext{ cm} \div 100 = 21 	ext{ m}$$

Question 8

Which of the following is the correct scientific notation for 0.00021?

Accepted Answer

$$2.1 	imes 10$$^{-4}$$

Question 9

A laboratory sample has a mass of 1.2 kilograms. How many grams is this?

Accepted Answer

$$1.2 	ext{ kg} 	imes 1000 = 1200 	ext{ g}$$

Question 10

A student is asked to convert 0.0035 meters to millimeters. What is the correct answer?

Accepted Answer

$$0.0035 	ext{ m} 	imes 1000 = 3.5 	ext{ mm}$$

Question 11

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 12

A solution contains 0.25 liters. How many microliters does this represent?

Accepted Answer

$$0.25 	ext{ L} 	imes 1,000,000 = 250,000 	ext{ \mu L}$$

Question 13

Which conversion would you use to change 3.2 meters to centimeters?

Accepted Answer

$$3.2 	ext{ m} 	imes 100 = 320 	ext{ cm}$$

Question 14

A patient receives 500 mL of IV fluid. How many liters is this?

Accepted Answer

$$500 	ext{ mL} \div 1000 = 0.5 	ext{ L}$$

Question 15

Which of the following is the correct prefix for $$10^{-6} in $$the metric system?

Accepted Answer

Micro ($$\mu)$$

Question 16

A chemistry experiment requires 0.002 kilometers of wire. How many centimeters is this?

Accepted Answer

$$0.002 	ext{ km} 	imes 1000 = 2 	ext{ m}; 2 	ext{ m} 	imes 100 = 200 	ext{ cm}$$

Question 17

Which of the following is the correct order of magnitude from largest to smallest?

Accepted Answer

Kilometer, meter, centimeter, millimeter, micrometer

Question 18

A sample has a mass of $$2.5 	imes 10^4$ milligrams. What is the mass in grams?

Accepted Answer

$$2.5 	imes 10^4$ 	ext{ mg} \div 1000 = 25 	ext{ g}$$

Question 19

A car travels 150 kilometers. How many meters has it traveled?

Accepted Answer

$$150 	ext{ km} 	imes 1000 = 150,000 	ext{ m}$$

Units, Measurement, and Conversion in Chemistry

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