An ionic compound is formed by exchange of valency between bonding ions.
The formula of an ionic compound formed from O2− with;
Magnesium ion has a charge of 2+ and oxygen ion has a charge of 2-, when the two are combined, we obtain a compound of formula MgO.
Sodium ion has a charge of +1 and oxygen ion has a charge of 2-, when the two are combined, we obtain a compound of formula Na2O.
Aluminium ion has a charge of +3 and oxygen ion has a charge of -2, when the two are combined, we obtain a compound of formula Al2O3.
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The question is too broad. Depends of the battery and depends where do you connect it to.
define first a battery reaction and where it is connected to define if the reaction is endo or exothermic.
If a battery reaction is exothermic when it is connected to a circuit may be endothermic when it is charged (reverse reaction).
some batteries at low temperature tends to work less, that suggest, they may need absorb some energy from the surroundings.
Answer:
As the Tin has "lousy properties," humans can use copper before tin.
Explanation:
Heat of formation of the copper (II) oxide = -156KJ/mol
Heat of formation of Tin (IV) oxide =-581KJ/mol
As, we know that the copper will form the copper oxide after receiving reduced energy. Humans were able to use the elemental copper before tin. And also, tin has itself the lousy properties as compared to Copper. Copper are also the good conductor of heat, hence they are used in the electric wiring. Apart, from that it is also being used for roofing and plumbing. And as heat exchangers in the industries Copper also possess the antibacterial property.
Explanation:
Two acids we come into contact with in an average week
- Vinegar is an 10% solution of acetic acid in water. Used in salad dressing and while cooking food. It has a sour taste.
- Citric acid present in fruits and vegetables like : lemons, orange, tomatoes etc. It is a weak organic acid with sour taste.
Two bases we come into contact with in an average week.
- Baking soda () is used in baking food like: cakes, cookies, breads. Baking soda is one of the ingredient while baking breads and cakes.
- Caustic soda (NaOH) is used for preparation of detergents, papers , soaps etc. We use soaps and detergents for washing.