You did not provide the statement, however, the most accurate things about atoms is that everything is made out of them in the entire universe, and they consist of protons, electrons, and neutrons. They create all substances in existence.
The main difference between a covalent compound and an ionic compound is the type of elements used. In a covalent compound, a nonmetal bonds with another nonmetal (e.g. H20, NH3, CH4).
In an ionic compound, a metal bonds with a nonmetal (e.g.NaCl, KCl, MgCl2). What makes an ionic compound binary is the amount of atoms used. This includes any ionic compounds that has two atoms such as NaCl and KCl.
Note that although MgCl2 has two elements, it does not have the same amount of atoms. Mg is one atom and Cl has a subscript of 2 which makes chlorine have two atoms.
Hope this helps!!!
Answer:
This is an exothermic reaction
q = 563 kJ
Explanation:
Step 1: The balanced thermochemical equation
H2CO(g) + O2(g) → CO2(g) + H2O(l) ΔH = -563 kJ
This is a combustion, this means there will be released heat. This means it's an exothermic reaction.
The energy involved, will be released (that's why ΔH is negative)
q has the same value as ΔH (but positive)
q = 563 kJ
Tip for next time, when you are looking at these things, rather than just posting it, take a look at your options. A solid to a gas, this means that melting cant be an option because that is solid to a liquid, evaporation cant be an option because that is liquid to a gas and condensation cant be because that is gas to a l. Therefore the answer must be sublimatio.
