Answer:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. The process of photosynthesis in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce organic compounds and oxygen.
Answer;
D. The group number is equal to the number of valence electrons.
Explanation;
-The valence electrons are the electrons in the outer shell of an atom. The valence electrons are the ones involved in forming bonds to adjacent atoms. Therefore, the number of valence electrons is important for determining the number of bonds an atom will form, the number of unpaired electrons, and an atom’s formal charge.
-For neutral atoms, the number of valence electrons is equal to the atom’s main group number.
Number of valence electrons = main group number (neutral atoms)
-The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.
The gravitational field is the Force divided by the mass
Call g the gravitational fiel, F the force exerted by the earth and m the mass of the telescope.
g = F / m
g=9.1x10^4 N / 1.1 x 10^4 kg = 8.27 N/kg
Note that the unit N/kg is equivalent to m/s^2
Explanation: A sneaker is a want because you don't actually need it to survive
21. Magnetism is produced by the motion of electrons as they
a. move around the nucleus.
b. spin on their axes.
c. both A and B
d. none of the above
22. If you put a small compass in a magnetic field, the compass will
a. line up in a direction parallel to the magnetic field lines.
b. swing randomly.
c. line up in a direction perpendicular to the magnetic field lines.
d. seek electrical charge concentrations.
23. Magnetic field strength is
a. strongest close to a magnet.
b. constant everywhere around a magnet.
c. strongest far from a magnet.
24. Magnetic domains are
a. regions that may or may not be magnetized.
b. clusters of atoms randomly aligned.
c. regions of atoms magnetically aligned.
d. blocks of material.
25. Earth's magnetic field is most likely due to
a. millions of small magnets buried in Earth.
b. a magnetized solid inner core of Earth.
c. convection currents in the molten part of Earth's interior.
d. the rotation of Earth acting on all of Earth's electrons.