Question 1

Which laboratory apparatus is best suited for accurately measuring and transferring small volumes of liquid, such as 1.00 mL of a solution?

Accepted Answer

Transfer pipet

Question 2

A student needs to prepare 250 mL of a 0.100 M HCl solution and then add it to 200 mL of a 0.200 M NaOH solution. Which apparatus should be used to measure the HCl solution most precisely?

Accepted Answer

Transfer pipet

Question 3

Which apparatus is commonly used to separate immiscible liquids, such as oil and water, in an organic chemistry experiment?

Accepted Answer

Separatory funnel

Question 4

A scientist mixes 200 mL of pure water with 100 mL of 0.75 M KCl (aq). What is the final molarity of KCl in the mixture?

Use the formula: $$M_1V_1 = M_2V_2$$

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 5

Which apparatus is best for heating a solid substance to dryness in a laboratory setting?

Accepted Answer

Evaporating dish

Question 6

How can a 100-fold dilution be achieved in a laboratory setting?

Accepted Answer

1 part solvent to 99 parts solution

Question 7

Which apparatus is most appropriate for titrating an acid with a base to determine the concentration of the acid?

Accepted Answer

Buret

Question 8

A student needs to prepare a standard solution by dissolving a precise mass of solute in a specific volume of solvent. Which apparatus should be used to ensure the final volume is exact?

Accepted Answer

Volumetric flask

Question 9

Which apparatus is best for filtering a solid from a liquid in a mixture?

Accepted Answer

Funnel

Question 10

A graduated cylinder is used to measure the volume of a liquid. If a student reads the meniscus at the top rather than the bottom, what is the likely result?

Accepted Answer

The measured volume will be too high.

Question 11

Which apparatus is most suitable for mixing chemicals when splashing or evaporation must be minimized?

Accepted Answer

Erlenmeyer flask

Question 12

A scientist needs to transfer a solid chemical from a container to a balance for weighing. Which apparatus should be used?

Accepted Answer

Spatula

Question 13

Which apparatus is best for measuring the volume of a liquid with moderate accuracy, but not for preparing standard solutions?

Accepted Answer

Graduated cylinder

Question 14

A student is performing a solvent extraction to separate a compound from a mixture. Which apparatus should be used?

Accepted Answer

Separatory funnel

Question 15

Which apparatus is most appropriate for holding and heating small quantities of solid chemicals?

Accepted Answer

Test tube

Question 16

A solution is prepared by dissolving 5.0 g of NaCl in enough water to make 250 mL of solution. What is the molarity of the solution?

Use: $$	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{liters of solution}}

($$Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.34\ \mathrm{M}$$

Question 17

Which apparatus is best for transferring a measured volume of liquid from one container to another without significant loss?

Accepted Answer

Transfer pipet

Question 18

A student needs to prepare 100 mL of a 0.10 M solution from a 1.0 M stock solution. What volume of stock solution should be used?

Use: $$C_1V_1 = C_2V_2$$

Accepted Answer

$$10\ \mathrm{mL}$$

Question 19

Which apparatus is most appropriate for containing a reaction mixture that needs to be swirled without risk of spillage?

Accepted Answer

Erlenmeyer flask

Question 20

A scientist needs to measure 50.0 mL of a liquid with the highest possible accuracy. Which apparatus should be used?

Accepted Answer

Buret

Laboratory Apparatus and Solution Preparation in GOB Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard