Analytical Chemistry Quiz

What is the main focus of analytical chemistry?

• The study of chemical reactions

• The measurement and analysis of substances

• The production of synthetic materials

• The classification of elements

Which of the following best describes qualitative analysis?

• Determines the amount of each substance in a sample

• Measures the volume of a chemical solution

• Reveals the identity of elements or compounds in a sample

• Analyzes the rate of a chemical reaction

Gravimetric analysis is based on:

• The mass of the analyte or a related compound

• The electrical properties of a sample

• The reaction of the analyte with a standard solution

• The measurement of light absorbance

The electroanalytical method relies on:

• Electrical properties such as potential and current

• The absorption of light by a sample

• The reaction of a compound with a reagent

• The precipitation of an analyte

Interference in analytical chemistry refers to:

• The collection of all components in a sample

• A species that alters the measured quantity

• The reaction between an analyte and a reagent

• A process that reduces measurement accuracy

Accuracy in measurements refers to:

• The reproducibility of measurements

• The closeness to the true value

• The ability to repeat an experiment

• The comparison of multiple data sets

A calibration curve is used to:

• Define the precision of an analytical method

• Measure the concentration of an analyte

• Determine the mass of an unknown substance

• Compare different analytical methods

The volumetric method in analysis is based on:

• The mass of the analyte

• The volume of a solution reacting with the analyte

• The potential difference in an electrochemical cell

• The absorption of infrared light

Which term refers to the substance being analyzed in a sample?

• Titrant

• Analyte

• Solvent

• Reagent

A replicate sample is:

• A portion of material analyzed under identical conditions

• A sample that is tested once

• A single measurement of an analyte

• A control sample with no analyte