Question 1

Which of the following numbers is correctly expressed in scientific notation with the appropriate number of significant figures for the value 113000000000?

Accepted Answer

$1.13 	imes 10^{11}$

Question 2

A measurement is recorded as $10.2 \pm 0.3$ mg. What does the $\pm 0.3$ mg represent?

Accepted Answer

The uncertainty or possible error in the measurement

Question 3

Which of the following is the correct SI base unit for luminous intensity?

Accepted Answer

Candela

Question 4

If the speed of sound is $3.4 	imes 10^{4}$ cm/s, what is this value in m/s?

Accepted Answer

$340$ m/s

Question 5

Which of the following is a derived SI unit?

Accepted Answer

Joule ($\mathrm{kg\ m^2\ s^{-2}}$)

Question 6

A student measures a value as $1.1050$ and needs to round it to three significant figures. What is the correct rounded value?

Accepted Answer

$1.11$

Question 7

Which of the following correctly expresses $0.127$ L in mL?

Accepted Answer

$127$\ \mathrm{mL}$

Question 8

Which of the following prefixes represents $10^{-9}$?

Accepted Answer

nano

Question 9

If you double the size of a sample, which of the following properties will remain unchanged?

Accepted Answer

Density

Question 10

What is the mass in kilograms of $3.5$ L of water, given that the density of water is $1\ \mathrm{g/cm^3}$?

Accepted Answer

$3.5$ kg

Question 11

Which of the following is the correct relationship between liters, decimeters cubed, and centimeters cubed?

Accepted Answer

$1\ \mathrm{L} = 1\ \mathrm{dm^3} = 1000\ \mathrm{cm^3}$

Question 12

Which of the following is the correct value for Avogadro's number?

Accepted Answer

$6.022 	imes 10^{23}$

Question 13

A pressure is measured as $760$ mm Hg. What is this value in atmospheres (atm)?

Accepted Answer

$1$ atm

Question 14

Which of the following is the correct SI base unit for temperature?

Accepted Answer

Kelvin

Question 15

Convert $23$ K to degrees Celsius.

Accepted Answer

$-250.15\ ^\circ\mathrm{C}$

Question 16

Which of the following is the correct formula for density?

Accepted Answer

$\mathrm{density} = \frac{\mathrm{mass}}{\mathrm{volume}}$

Question 17

Which of the following is the correct SI prefix for $10^{12}$?

Accepted Answer

tera

Question 18

A calculation yields the value $4.6234 	imes 10^{5}$. If you are to report this value with two significant figures, what is the correct answer?

Accepted Answer

$4.6 	imes 10^{5}$

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

Joule

Question 20

Which of the following best describes an extensive property?

Accepted Answer

A property that depends on the amount of substance present

Measurement, Scientific Notation, and SI Units in General Chemistry

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