Q: A chemist needs to express $$0.00056$$ meters in scientific notation. Which is the correct representation?

$$5.6 \times 10$$^{-4}$$ \, \mathrm{m}$$

Question 1

A scientist measures the mass of a cantaloupe in a laboratory. Which SI base unit should be used to record this measurement?

Accepted Answer

kilogram

Question 2

A medical researcher records the time it takes for a patient to run a 100-meter dash using a stopwatch. What is the SI base unit for this measurement?

Accepted Answer

second

Question 3

A child’s height is measured during a routine checkup. Which SI base unit is appropriate for this measurement?

Accepted Answer

meter

Question 4

Which of the following statements best describes absolute zero?

Accepted Answer

It is the temperature at which all atomic and molecular motion stops.

Question 5

Convert a temperature of $$25 \, ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.15 \, \mathrm{K}$$

Question 6

A gas sample is cooled from $$300 \, \mathrm{K} to$$ $$0 \, ^\circ\mathrm{C}. $$What is the final temperature in Kelvin?

Accepted Answer

$$273.15 \, \mathrm{K}$$

Question 7

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273.15$$

Question 8

A laboratory experiment requires a temperature of $$77 \, \mathrm{K}. $$What is this temperature in degrees Celsius?

Accepted Answer

$$-196.15 \, ^\circ\mathrm{C}$$

Question 9

A student measures the volume of a liquid using a graduated cylinder and records $$250 \, \mathrm{mL}. $$Which metric prefix and base unit combination best represents this measurement in SI units?

Accepted Answer

0.25 liters

Question 10

A chemist needs to express $$0.00056$$ meters in scientific notation. Which is the correct representation?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$ \, \mathrm{m}$$

Question 11

A block of metal has a mass of $$150 \, \mathrm{g}$$ and a volume of $$50 \, \mathrm{cm}^3. $$What is its density?

Accepted Answer

$$3.0 \, \mathrm{g/cm}^3$$

Question 12

A sample of gas is at $$-40 \, ^\circ\mathrm{C}. $$What is the temperature in Kelvin?

Accepted Answer

$$233.15 \, \mathrm{K}$$

Question 13

Which of the following best explains why the Kelvin scale is used in scientific measurements?

Accepted Answer

It starts at absolute zero, where all molecular motion stops.

Question 14

A student needs to convert $$5.0 \, \mathrm{kg} to $$grams. What is the correct value?

Accepted Answer

$$5000 \, \mathrm{g}$$

Question 15

A laboratory thermometer reads $$100 \, ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$373.15 \, \mathrm{K}$$

Question 16

A nurse records a patient’s body temperature as $$310.15 \, \mathrm{K}. $$What is this temperature in degrees Celsius?

Accepted Answer

$$37.00 \, ^\circ\mathrm{C}$$

Question 17

A student is asked to measure the time it takes for a chemical reaction to complete. Which SI base unit should be used?

Accepted Answer

second

Question 18

A chemist needs to prepare $$0.0025$$ liters of a solution. Express this volume in milliliters using the correct metric prefix.

Accepted Answer

$$2.5 \, \mathrm{mL}$$

Question 19

A sample of water is heated from $$20 \, ^\circ\mathrm{C} to$$ $$80 \, ^\circ\mathrm{C}. $$What is the change in temperature in Kelvin?

Accepted Answer

$$60 \, \mathrm{K}$$

Question 20

A laboratory balances measures a sample as $$0.045 \, \mathrm{kg}. $$What is this mass in grams?

Accepted Answer

$$45 \, \mathrm{g}$$

Chapter 1: Matter, Measurement, and Problem Solving – Units of Measurement & Absolute Zero

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