1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sergij07 [2.7K]
3 years ago
12

The quinine in tonic water shines a strange blue-white colour when lit with UV light. Explain what is happening here.

Chemistry
1 answer:
Alecsey [184]3 years ago
5 0

Answer:

Here's what I get.

Explanation:

Quinine contains phosphors, substances that glow when they are hit with certain wavelengths of light.

The phosphors in quinine absorb UV light, which is invisible to our eyes.

Electrons in the phosphors absorb the UV energy and are excited to higher energy levels.

When the electrons drop back to lower energy levels, they emit some of this energy as a glowing blue visible light.  

You might be interested in
An excess of oxygen reacts with 451.4 g of lead, forming 374.7 g of lead(II) oxide. Calculate the percent yield of the reaction.
Stels [109]

Answer: The percent yield of the reaction is 77.0 %

Explanation:

2Pb+O_2\rightarrow 2PbO

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

\text{Number of moles of lead}=\frac{451.4g}{207.2g/mol}=2.18moles

\text{Number of moles of lead oxide}=\frac{374.7g}{223.2g/mol}=1.68moles

According to stoichiometry:

2 moles of Pb produces = 2 moles of PbO_2

2.18 moles of Pb is produced by=\frac{2}{2}\times 2.18=2.18moles of PbO_2

Mass of PbO_2 =moles\times {\text {Molar mass}}=2.18\times 223.2g/mol=486.6

percent yield =\frac{374.7g}{486.6g}\times 100=77.0\%

3 0
3 years ago
How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 6.46 atm and 45°C in the reaction shown below?
ankoles [38]
The chemical reaction equation for this is 

XeF6 + 3H2 ---> Xe + 6HF

Assuming gas behaves ideally, we use the ideal gas formula to solve for number of moles H2 with T = 318.15K (45C), P = 6.46 atm, V = 0.579L. Then we use the gas constant R = 0.08206 L atm K-1 mol-1.

we get n = 0.1433 moles H2

to get the mass of XeF6, 

we divide 0.1433 moles H2 by 3 since 1 mole XeF6 needs 3 moles H2 to react then multiply by the molecular weight of XeF6 which is 245.28 g/mole XeF6.

0.1433 moles H2 x \frac{1 mole XeF6}{3 moles H2} x \frac{245.28 g XeF6}{1 mole XeF6} = 11.71 g XeF6

Therefore, 11.71 g of XeF6 is needed to completely react with 0.579 L of Hydrogen gas at 45 degrees Celcius and 6.46 atm.
3 0
4 years ago
How many amino acids will be in the polypeptide produced by the normal dna/mrna sequence?
vichka [17]
The number of amino acids that will be in the polypeptide chain produced by the normal DNA or MRNA sequence is usually 30 amino acids. Although the number of amino acids depends on the function of the generated DNA or RNA. The types of amino acids also differ depending on the function. 
7 0
4 years ago
Read 2 more answers
Write the significance of Faraday's law?
Gala2k [10]
It helps shape and create the study of electromagnetism
3 0
3 years ago
What happens when a glass of water is set in the sun until the water
zalisa [80]

Answer:

D is the answer

Explanation:

6 0
3 years ago
Other questions:
  • If your weight is 120 pounds
    11·1 answer
  • White light, which consists of all frequencies, forms which type of spectrum? an absorption spectrum a line spectrum an emission
    9·1 answer
  • 11. Propane (C3Hg) is a fuel commonly used in gas grills.
    10·1 answer
  • How does the catalyst affect the magnitude of the activation energy?
    5·1 answer
  • How many moles of kcl are produced from 2.00 moles of k and excess cl2?​
    10·1 answer
  • What is kinetic energy?
    7·2 answers
  • What is the molecular formula for water?
    15·2 answers
  • (0)A mixture of dihydrogen and dioxygen at one bar pressure contains 70% by weight of dioxygen. Calculate the partial pressure o
    5·1 answer
  • PLEASE HURRY!!!! The diagram shows 2 identical charged particle. How does the potential energy and the force of repulsion change
    15·1 answer
  • Here is a picture and diagram of the question
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!