Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 18: Q33P (page 459)

What is the difference between luminescence and Chemi-luminescence?

Short Answer

Expert verified

Chemi-luminescence is a type of luminescence that occurs during chemical reactions in some substances.

Luminescence is the emission of electromagnetic radiation (mostly light, but also ultraviolet and infrared radiation) which is not excited by a thermal process and elevated temperature of the substance but is due to receiving energy in some other form.

Step by step solution

01

Chemi-luminescence:

Chemiluminescence is the release of light from a chemical reaction.

02

Luminescence:

Luminosity is the sudden release of light by a substance not produced by heat; Or "cold light". It is therefore a form of cold body radiation.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

What is the difference between a fluorescence excitation spectrum and a fluorescence emission spectrum? Which one resembles an absorption spectrum?

Preparing standards for a calibration curve.

(a) How much ferrous ammonium sulfate(FeNH42SO42⋅6H2OFM392.15)should be dissolved in a 500mL volumetric flask withto obtain a stock solution with1000μgFe/mL?

(b) When making stock solution (a), you weighed out 3.627 g of reagent. What is the Fe concentration in?

(c) How would you prepare 250mL of standard containing containing ~1,2,3,4,5,6,7,8and10in0.1MH2SO4infrom stock solution (b) using only 5- and 10-mL Class A pipets, only 250mL volumetric flasks, and only two consecutive dilutions of the stock solution? For example, to prepare a solution with ~4μgFe/mL,, you could first dilute 15mL(=10+5mL) of stock solution up to 250 mL mLto get~(1525)(1000μgFFe/mL)=∼60μgFe/mL Then dilute 15mL of the new solution up to 250 mL again to get~(15250)(60μgFe/mL)=∼3.6μgFe/mL

18-26. A 2.00mL solution of apotransferrin was titrated as illustrated in Figure 18-11. It required 163L of 1.43 mM ferric nitrilotriacetate to reach the end point.

(a) Why does the slope of the absorbance versus volume graph change abruptly at the equivalence point?

(b) How many moles of Fe(III) (= ferric nitrilotriacetate) were required to reach the end point?

(c) Each apotransferrin molecule binds two ferric ions. Find the molar concentration of apotransferrin in the 2.00mL solution.

Consider a molecule that can fluoresce from the S1 state and phosphoresce from the T1 state. Which is emitted at longer wavelength, fluorescence or phosphorescence? Make a sketch showing absorption, fluorescence, and phosphorescence on a single spectrum.

Semi-xylenol orange is a yellow compound at pH 5.9but turns red when it reacts with Pb2+. A 2.025 - mLsample of semixylenol orange at pH 5.9was titrated with7.515×10-4MPb(NO3)2with the following results:

Total role="math" localid="1663647483742" μLPb2+added

Absorbance at 490nmwavelength

Total μLPb2+added

Absorbance at490nmwavelength

0.0

6.0

12.0

18.0

24.0

30.0

36.0

0.227

0.256

0.286

0.316

0.345

0.370

0.399

42.0

48.0

54.0

60.0

70.0

80.0


0.425

0.445

0.448

0.449

0.450

0.447


Make a graph of absorbance versus microliters of Pb2+added. Be sure to correct the absorbances for dilution. Corrected absorbance is what would be observed if the volume were not changed from its initial value of 2.025Ml. Assuming that the reaction of semi orange with Pb2+has a 1 : 1stoichiometry, find the molarity of semi-xylenol orange in the original solution.
See all solutions

Recommended explanations on Chemistry Textbooks

Chemical Analysis

Read Explanation

The Earths Atmosphere

Read Explanation

Organic Chemistry

Read Explanation

Physical Chemistry

Read Explanation

Ionic and Molecular Compounds

Read Explanation

Chemical Reactions

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free