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
a_sh-v [17]
3 years ago
5

When light energy excites electrons in photosystem II, where do the electrons to replace them come from?

Chemistry
1 answer:
Artyom0805 [142]3 years ago
3 0
Oh we have just done this in biology recently... photolysis occurs where it splits apart water molecules to make electrons and hydrogen ions (the H+ is used to reduce NaDP later on) and also O₂ is made as a by product

basically this is the equation 2H₂O⇒4e⁻ + 4H⁺  where the electrons replace the lost ones in chlorophyll

hope this helped :)
You might be interested in
Weathering is a process in the rock cycle. How does weathering contribute to the formation of rocks?
Alisiya [41]
The third option is the answer



Weathering is the process that changes solid rock into sediments. Sediments were described in the Rocks chapter. With weathering, rock is disintegrated. It breaks into pieces.
6 0
2 years ago
Read 2 more answers
When the following redox equation is balanced with smallest whole number coefficients, the coefficient for nitrogen dioxide will
Phoenix [80]

In a redox reaction, electron could be lost or gained. The coefficients in the balanced redox reaction are;  1/2, 5, 1, 5, 2, 1.

<h3>What is a redox reaction equation?</h3>

A redox reaction equation shows the species that were oxidized or reduced in a redox reaction. In this case, we are asked for the coefficients in a balanced redox reaction equation.

We must recall that five electrons were lost/gained in the process hence the balanced reaction equation is;

1/2I2 + 5HNO3 -----> IO3^- + 5NO2 + 2H2O + H^+

The coefficients in the balanced equation therefore are; 1/2, 5, 1, 5, 2, 1.

Learn more about redox reaction: brainly.com/question/13293425

7 0
2 years ago
Read 2 more answers
Both kepler's laws and newton's laws tell us something about the motion of the planets, but there are fundamental differences be
I am Lyosha [343]

Answer: See description

Explanation:

Kepler's laws have three principal points:

1. planets orbit the sun in elliptical paths

2. the orbial period is related to the orbital distance by T^{2} = d^3

where T is the orbital period and d is the orbital distance, T is in years and d is measured in units of the earth sun distance.

3. planets closer to the sun move faster than planets far away from it.

Newton:

Newton discovered that there is a consequence to the gravity exerted by objects: mass, the heavier the planet, the more gravitational force it posseses ( thats why we orbit the sun)

with the gravitational force F_{gravitational} =G \frac{Mm}{r^2} newton discovered the inverse-quadratic relationship between the distance of the planets and the acceleration exerted by the force one could exert on another.

Kepler's laws were mostly based on observed evidence with quantitative relationships between the mentioned variables. Newton's laws are based on calculus and symbolic equations. While Kepler's mode is basic, Newton took another step in and build a more general model for gravity (which was improved by general relativity later). In a nutshell Newton proved the scientific causes for Kepler's laws...

3 0
3 years ago
Calculate the mass in grams of 202 atoms of iron
Sergeeva-Olga [200]

Answer:

To calculate the number of atoms in a sample, divide its weight in grams by the amu atomic mass from the periodic table, then multiply the result by Avogadro's number: 6.02 x 10^23. Set up Equation Express the relationship of the three pieces of information you need to calculate the number of atoms in the sample in the form of an equation.

4 0
2 years ago
who reported four “element” classifications, but included some substances that were combinations of elements rather than true el
kozerog [31]
Answer: Antoine Lavoisier.

He classified the elements into four groups: elastic fluids, nonmetals, metals and earths. Some of the called elementes were not really elements (light and heat). Others were compounds, e.g. hydrochloric acid.






7 0
3 years ago
Read 2 more answers
Other questions:
  • when sodium atom reacts with chlorine atoms form a compound, the electron configurations of ions forming the compound are the sa
    8·1 answer
  • A chemical bond joins atoms or electrons? together in a molecule
    10·1 answer
  • Which element must be present in an organic compound?(1) hydrogen (3) carbon(2) oxygen (4) nitrogen
    10·2 answers
  • According to one theory, the pressure of a gas increases as its volume decreases, because the molecules in the gas have to move
    9·1 answer
  • Cumene (isopropylbenzene) is a relatively inexpensive commercially available starting material. Show how you could prepare m-iso
    15·1 answer
  • Is H+ an acid, a base, or is it neutral?
    7·2 answers
  • While washing his hands before the client consultation with Chloe, Jayden dripped some water onto the countertop. When he came b
    10·1 answer
  • How did dmitri mendeleev arrange the periodic table.
    8·1 answer
  • A lake has a surface area of 16.0 square miles and an average depth of 49.0 feet.
    14·1 answer
  • Which is the electron configuration for zinc?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!