Carbon is black and sulfur is yellow
Answer:
a partial negative charge
Explanation:
The oxygen on water molecules carries a partial negative charge on it. Water is made up of oxygen and hydrogen bonded via polar covalent bonds.
This bond involves the attraction between two atoms that shares their valence electrons in covalent bonding. The oxygen atom is more electronegative with more affinity for the shared electron. This suggests that it will pull the shared electrons more closer than the hydrogen atom.
This pull due to electronegativity difference leaves a partial negative charge on oxygen and a partial positive charge on hydrogen.
Electrons absorb energy, as they absorb energy they go from ground state to excited state and to return to ground state electrons release energy in the form of photons producing that color.
Answer:
A. Rutherford and Bohr
Explanation:
I think this is right but I am not sure it has been a while since i read about them
Answer:
Mass = 17.8 g
Explanation:
Given data:
Number of atoms of Ca = 2.68 × 10²³
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.68 × 10²³ atoms × 1 mole /6.022 × 10²³ atoms
0.445 mol
Mass in gram;
Mass = number of moles × molar mass
Mass = 0.445 mol × 40 g/mol
Mass = 17.8 g