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
Juliette [100K]
3 years ago
7

Why does paper "brown" after a while?

Chemistry
1 answer:
ElenaW [278]3 years ago
5 0

Answer:

Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.

You might be interested in
ANSWER FAST!!
belka [17]

Answer: 800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

Explanation:

Volume of the methyl alcohol = x

Volume of water = y = 200 mL

Volume of the solution ,V = x + y

Volume percentage of solution = 80%

x = 800 mL

800 mL of methyl alcohol should be added to 200 ml of water to make this solution.

4 0
2 years ago
Where photosynthesis takes place?
Vlad [161]

Answer:

chloroplasts

Explanation:

3 0
4 years ago
How many valence electrons do nitrogen atoms have
julsineya [31]
Five valence electrons for one nitrogen and 10 valence electrons for two nitrogens
4 0
4 years ago
Which type of electromagnetic wave has the greatest frequency?(1 point)
Citrus2011 [14]

c. x-rays

My answer is that x-rays or gamma rays have the greatest (or highest) frequency waves.

8 0
3 years ago
7.The _____ theory of matter states that all particles of matter are in constant motion.
SashulF [63]
The kinetic energy theory of matter states that all particles of matter are in constant motion.
Kinetics has to do with some kind of movement, which is why this answer is the only plausible one. 
6 0
4 years ago
Read 2 more answers
Other questions:
  • #1: Which of the following is likely to be a polar compound?
    8·1 answer
  • The nucleus of an atom is
    11·2 answers
  • (50 POINTS!)
    10·2 answers
  • How can we choose the best chemicals to create a cold or hot pack?
    7·1 answer
  • Which of the following is not a feature of iron (III) oxide?
    10·2 answers
  • In Hooke's law, Fspring=kΔx, what does the ∆x stand for?
    7·2 answers
  • How many grams of carbon are In 25 g of CO2?
    12·1 answer
  • A train travels 380 miles in 5 hours 15 minutes. Calculate its<br> average speed.
    13·1 answer
  • Which two processes turn layers of loose sediment into hard sedimentary rock? (ASAP)
    7·1 answer
  • Li + H2O → H2 + LiOH is it Balanced or Unbalanced​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!