Answer:
If the substance is a liquid or solid, production of an odor would indicate a chemical change.
Explanation:
Ocean acidification is occurring because excess carbon dioxide (CO2) in the atmosphere is being absorbed at the surface of the ocean at an increasing rate. This excess CO2 results in more hydrogen ions, which increases the acidity of the ocean.
Answer:
- <u><em>Solution </em></u><em>is a physical combination of one substance dissolved in another.</em>
Explanation:
A <em>solution</em> is a homogeneous mixture.
The solutions are characterized by uniform composition and one phase, but they can be either solid, liquid or gases.
In a solution there is, at least, one solute <em>substance</em> and one or more solvents.
A typical solution is salt and water: salt is the solute, which is <em>dissolved</em>, in water (the solvent).
In a solution, you can not distinguish visually the solute from the solvent, but, since they are physically, and not chemically, combined, they can be separated by physical media, e.g. evaporation.
You should have given us a table, but I think my table shouldn't be too different.
Let's put oxidation numbers first.
You would have to know that Mg(s) is a reducing agent and Br2(l) is an oxidizing agent. But it is pretty common knowledge that the halogens will tend to take the electrons and alkali and alkaline earth metals will tend to give up electrons.
Mg is oxidized because it gives up electrons; Br2(l) is reduced because it gains electrons. Since the reaction conforms to what we would expect to <em>naturally</em> (thermodynamically favored) occur, it can take place given that the activation energy is supplied.
Explanation:
Single covalent bonds
When an atom needs 1 electron to attain noble gas configuration they share rhe atoms in order to gain this ex ; H2 molecule
double covalent; O2 molecule
triple covalent; N2 molecule