Law of conservation of charge
Na₂S(aq) + CuSO₄(aq) = Na₂SO₄(aq) + CuS(s)
2Na⁺(aq) + S²⁻(aq) + Cu²⁺(aq) + SO₄⁻(aq) = 2Na⁺(aq) + SO₄²⁻(aq) + CuS(s)
S²⁻(aq) + Cu²⁺(aq) = CuS(s)
The precipitate of cupric(II) sulfide is formed.
Answer:
0.4777 cm³
Explanation:
Molar mass is defined as the mass of 1 mole of the substance.
The molar mass fo Ag is 107.8682 g/mol
Since, 1 mole of Ag contains 6.022×10²³ molecules of Ag
So,
6.022×10²³ molecules of Ag has a mass of 107.8682 g
Also,
1 molecule of Ag has a mass of 107.8682/6.022×10²³ g
2.8×10²² molecules of Ag has a mass of (107.8682/6.022×10²³)×2.8×10²² g
Mass of 2.8×10²² molecules = 5.0155 g
Given that density = 10.5 g/cm³
Volume = ?
So, volume:
<u>Volume = 0.4777 cm³</u>
Answer: Heat and Light.
Explanation: When the wood is burned, it combines with oxygen in air to partake in a combustion reaction which is exothermic. It coverts the chemical energy in the wood and release them as light and heat. Stored potential energy (in the form of chemical energy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in the form of heat.
Because painting a fence is not a chemical reaction, it is on the outside which can make something a physical change. For example, a physical change is like changing the color of your hair, but chemical changes is when a substance is formed or altered in a chemical reaction. Hope this helps a little