Question 1

Which of the following is the correct SI base unit for measuring the amount of substance in a chemical reaction?

Accepted Answer

mole (mol)

Question 2

A laboratory experiment requires you to measure the mass of a sample. Which SI base unit should you use, and what is its symbol?

Accepted Answer

kilogram (kg)

Question 3

A scientist measures the time it takes for a chemical reaction to complete. According to the SI system, which definition best describes the base unit for time?

Accepted Answer

The duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom

Question 4

Which of the following metric prefixes represents $$10^{-6}$$?

Accepted Answer

micro-

Question 5

A solution has a concentration of $$2.5 	imes 10$$^{-3}$$ mol/L. Which metric prefix would best express this concentration?

Accepted Answer

$$2.5$$ millimoles per liter ($$2.5$$ mmol/L)

Question 6

Which of the following is a derived SI unit?

Accepted Answer

liter (L)

Question 7

A chemist needs to prepare $$250 mL of a$$ $$0.100 M $$NaCl solution. What is the amount of NaCl (in moles) required?

Accepted Answer

$$0.025$$ mol

Question 8

Which SI base unit is defined by the length of the path traveled by light in vacuum during a time interval of $$1/299,792,458 of a $$second?

Accepted Answer

meter (m)

Question 9

A student records a measurement as $$0.00045$$ meters. Which metric prefix should be used to express this value most conveniently?

Accepted Answer

$$0.45$$ millimeters$$\ (0.45\ \mathrm{mm})$$

Question 10

Which of the following best describes the relationship between mass and volume in the context of SI units?

Accepted Answer

Mass is measured in kilograms, and volume in cubic meters

Question 11

A laboratory balances measures a sample as $$0.0032 kg. $$What is this mass in grams?

Accepted Answer

$$3.2 g$$

Question 12

Which SI base unit is used to measure electric current?

Accepted Answer

ampere (A)

Question 13

A chemist needs to convert $$5.00$$ liters to cubic meters. What is the correct conversion?

Accepted Answer

$$5.00 	imes 10$$^{-3}$$ m^3$

Question 14

Which of the following is NOT an SI base unit?

Accepted Answer

liter (L)

Question 15

A solution is prepared by dissolving $$0.500$$ mol of glucose in enough water to make $$1.00 L of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.500 M$$

Question 16

Which metric prefix corresponds to a factor of $$10^9$$?

Accepted Answer

giga-

Question 17

A light source emits $$2.0$$ candela of luminous intensity. Which physical quantity is being measured?

Accepted Answer

Luminous intensity

Question 18

A sample contains $$3.0 	imes 10$$^{24}$$ molecules of water. How many moles of water does this represent? (Avogadro's number = 6.022$$ 	imes $$10^{23}$$ mol$$^{-1})$$

Accepted Answer

$$5.0$$ mol

Question 19

Which of the following best describes the SI base unit for temperature?

Accepted Answer

Kelvin (K)

Question 20

A volumetric analysis requires the use of a burette to deliver $$25.00 mL of $$solution. What is this volume in liters?

Accepted Answer

$$0.02500 L$$

Chemical Measurements and SI Units: Foundations for General Chemistry

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