Śhüt ûp and go pay attention in your class
Answer:
Paraffin wax (or petroleum wax) is a soft colorless solid, derived from petroleum, coal or shale oil, that consists of a mixture of hydrocarbon molecules containing between twenty and forty carbon atoms. It is solid at room temperature and begins to melt above approximately 37 °C.
Answer:
In calcium oxide (CaO), oxygen and calcium are respectively a non-metal and a metal, whose bonding is based on the exchange of electrons to form an ionic bond, which balances their charges and makes it chemically stable.
Explanation:
<em>What is the reason that in the calcium oxide molecule is caO and not Ca₂O or CaO₂?</em>
Calcium is a metallic element -a soft metal- that is capable of bonding with a non-metallic element such as oxygen to form an ionic bond, so that each Ca atom will bond to a single O atom.
CaO (calcium oxide)
- <em>Ca Z = 20 </em>
- <em>O Z = 8</em>
Ca + O ---→ Ca⁺² + O ⁻²
K L M N K L K L M K L
2 8 8 2 2 6 2 8 8 2 8
The electron exchange that is observed occurs between +atom and atom, and for this reason the chemical formula of calcium oxide is CaO.
Calcium oxide (lime) is obtained by heating calcium carbonate (CaCO₃) to very high temperatures through the following reaction
CaCO₃ + heat → CaO + CO₂
<span>The scientist is looking for the presence of carbohydrates. Iodine will react with starches in any object and will turn a dark blue or black color. If the substance in question doesn't have carbohydrates (or starches) present, the iodine will remain a dark brown color.</span>
