Answer:
Mass = 9.58 g
Explanation:
Given data:
Mass of Fe₂O₃ formed = ?
Mass of Fe = 6.7 g
Solution:
Chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe:
Number of moles = mass/molar mass
Number of moles = 6.7 g/ 55.8 g/mol
Number of moles = 0.12 mol
now we will compare the moles of Fe and Fe₂O₃.
Fe : Fe₂O₃
4 : 2
0.12 : 2/4×0.12 = 0.06 mol
Mass of Fe₂O₃:
Mass = number of moles × molar mass
Mass = 0.06 mol × 159.69 g/mol
Mass = 9.58 g
Answer:
Ca(OH)2 +CO2========CaCO3 +H2O
Explanation:
since the number of elements in the right is equal to that of the elements in the left side shows it is balanced
Since it has lost 2 electrons, hence the protons would be more by 2.
Charge:
<span> C. +2</span>
Carbohydrates called starches
Answer:
Dalton’s Atomic Theory
The main points of Dalton’s atomic theory are:
Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed.
All atoms of an element are identical.
The atoms of different elements vary in size and mass.
Compounds are produced through different whole-number combinations of atoms.
A chemical reaction results in the rearrangement of atoms in the reactant and product compounds.
Atomic theory has been revised over the years to incorporate the existence of atomic isotopes and the interconversion of mass and energy. In addition, the discovery of subatomic particles has shown that atoms can be divided into smaller parts. However, Dalton’s importance in the development of modern atomic theory has been recognized by the designation of the atomic mass unit as a Dalton.
