Q: Which of the following is the correct equality for the prefix 'centi-'?

$$1 \ \mathrm{cm} = 1 \times 10$$^{-2}$$ \ \mathrm{m}$$

Q: Which of the following is the correct conversion factor to change kilograms to milligrams?

$$1 \ \mathrm{kg} = 1 \times 10^6$ \ \mathrm{mg}$$

Q: What is the value of $$1 \ \mathrm{mL} in $$liters?

$$1 \times 10$$^{-3}$$ \ \mathrm{L}$$

Q: Which of the following is the correct formula for calculating heat absorbed or released?

$$q = m \times SH \times \Delta T$$

Q: Which of the following is a correct equality for the prefix 'nano-'?

$$1 \ \mathrm{nm} = 1 \times 10$$^{-9}$$ \ \mathrm{m}$$

Question 1

Which of the following is the correct way to express 0.00056 in scientific notation?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 2

A sample of HDL cholesterol has a mass of 0.256 g and a volume of 0.215 mL. What is its density?

Accepted Answer

$$1.19 \ \mathrm{g/mL}$$

Question 3

Which of the following numbers has 3 significant figures?

Accepted Answer

$$0.0700$$

Question 4

Convert 45°C to Kelvin.

Accepted Answer

$$318 \ \mathrm{K}$$

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and water

Question 6

What is the correct prefix and symbol for $$10^9$$?

Accepted Answer

Giga (G)

Question 7

How many significant figures are in the measurement 0.00450?

Accepted Answer

3

Question 8

Which of the following is the correct equality for the prefix 'centi-'?

Accepted Answer

$$1 \ \mathrm{cm} = 1 	imes 10$$^{-2}$$ \ \mathrm{m}$$

Question 9

A student measures the mass of a sample as 5.004 kg. How many significant figures does this measurement have?

Accepted Answer

4

Question 10

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in a definite ratio

Question 11

If a sample of water is heated and absorbs 418.4 J of heat, raising its temperature by 10°C, what is the mass of the water? (Specific heat of water $$= 4.184 \ \mathrm{J/g}^\circ\mathrm{C})$$

Accepted Answer

$$10 \ \mathrm{g}$$

Question 12

Which of the following is the correct conversion factor to change kilograms to milligrams?

Accepted Answer

$$1 \ \mathrm{kg} = 1 	imes 10^6$ \ \mathrm{mg}$$

Question 13

Which of the following is a correct statement about homogeneous mixtures?

Accepted Answer

The composition is uniform throughout

Question 14

What is the value of $$1 \ \mathrm{mL} in $$liters?

Accepted Answer

$$1 	imes 10$$^{-3}$$ \ \mathrm{L}$$

Question 15

A student needs to convert 7.4 kg to grams. What is the correct answer?

Accepted Answer

$$7,400 \ \mathrm{g}$$

Question 16

Which of the following is the correct formula for calculating heat absorbed or released?

Accepted Answer

$$q = m 	imes SH 	imes \Delta T$$

Question 17

Which of the following is the correct scientific notation for 0.000001?

Accepted Answer

$$1 	imes 10$$^{-6}$$

Question 18

Which of the following is a correct equality for the prefix 'nano-'?

Accepted Answer

$$1 \ \mathrm{nm} = 1 	imes 10$$^{-9}$$ \ \mathrm{m}$$

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 20

A solution contains 2.4 kg of salt in 240 L of water. What is the concentration in g/L?

Accepted Answer

$$10 \ \mathrm{g/L}$$

Chemistry and Measurements: Scientific Notation, Units, Significant Figures, and Matter Classification

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