INTRODUCTION TO CHEMICAL ANALYSIS QUIZ

Which type of measurements rely on absolute values?

• pH measurements

• relative measurements

• volumetric measurements

• spectrophotometric measurements

What is the purpose of collecting homogeneous samples in analytical chemistry?

• To ensure accurate representation of the bulk materials

• To determine the concentration or amount of a substance

• To relate properties to composition or stuctures

• To diagnose disseases

Which type of acids are used for samples that will not dissolve in water?

• hydrogen fluoride

• aqua regia

• oxidizing acids

• non-oxidizing acids

In a redox titration, the analyte must be in a particular ____ before the titration begins.

• oxidation state

• concentration

• temperature

• pH level

It is a type of analysis where it focuses on determination of concentration or amount of a substance, it is called ____.

• qualitative analysis

• quantitative analysis

• both qualitative and quantitative analysis

• none of the above

Why is masking important in chemical analysis?

• To separate the analyte from the interfering constituents

• To determine the general composition of the sample

• To eliminate interferences by converting them to a non interfering form

• To select the method of analysis

In colorimetric method a colorless analyte must be converted to a ____ product for the measurement.

• volatile

• solid

• colored

• soluble

What is the purpose of dissolving samples?

• To determine the water content

• To decompose the samples

• To determine the size of the sample

• To analyze the water content in another sample

The following are examples of separation methods, except

• masking

• precipitation

• extraction

• chromatography

What is the main function of qualitative analysis in analytical chemistry?

• To determine the concentration or amount of a substance

• To identify the substances present

• To determine the structure of a substance

• To establish economic value of a substance