Answer:
A.
Explanation:
While solar power does produce carbon dioxide emissions in the manufacturing processes required to produce panels and batteries, it does not produce CO2 while converting solar energy to electrical energy.
Increase in kinetic energy as well as energy loss to the surroundings in the form of heat ( negligible)
Explanation:
1. subatomic particles.
2.proton, electron and neutron
3.The atomic mass of an element is actually the sum of the MASSES of protons and neutrons in AN atom of that element
4.An element's atomic number is equal to the number of protons in the nuclei of any of its atoms
5. Number of Protons = Atomic Number
Number of Electrons = Number of Protons = Atomic Number
Number of Neutrons = Mass Number - Atomic Number
For krypton:
Number of Protons = Atomic Number = 36
Number of Electrons = Number of Protons = Atomic Number = 36
Number of Neutrons = Mass Number - Atomic Number = 84 - 36 = 48
6. electron, lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. The rest mass of the electron is 9.1093837015 × 10−31 kg
7.The center of the atom is called a nucleus
8. Negatively charged particles are found in multiple layers outside the nucleus of the atom. These particles are called electrons, and they orbit in various energy levels around the atom's nucleus.
9. A charged particle is also called an ion
Yes, this is balanced. Each part of the substance (like Mg) has the same number on both sides.
Hope this helps you:)
Answer:
There will be formed 3.5 moles of Al2O3 ( 356.9 grams)
Explanation:
Step 1: Data given
Numbers of Al = 7.0 mol
Numbers of mol O2 = O2
Molar mass of Al = 26.98 g/mol
Molar mass of O2 = 32 g/mol
Step 2: The balanced equation
4Al(s) + 3O2(g) → 2Al2O3(s)
Step 3: Calculate limiting reactant
For 4 moles Al we need 3 moles O2 to produce 2 moles Al2O3
Al is the limiting reactant, it will be consumed completely (7 moles).
O2 is in excess. There will react 3/4 * 7 = 5.25 moles
There will remain 9-5.25 = 3.75 moles
Step 4: Calculate moles Al2O3
For 4 moles Al we'll have 2moles Al2O3
For 7.0 moles of Al we'll have 3.5 moles of Al2O3 produced
Step 5: Calculate mass of Al2O3
Mass Al2O3 = moles Al2O3 * molar mass Al2O3
Mass Al2O3 = 3.5 moles* 101.96 g/mol
Mass Al2O3 = 356.9 grams
There will be formed 3.5 moles of Al2O3 ( 356.9 grams)
