10 points for the most?

Question

2 what makes for a stable atom?
3.what does a superscript show?
4. why is NaCl neutral?
5. When do atoms become ions?
6. What are ionic compounds?
7. How are covalent bonds made?
8. What is a polar and nonpolar molecule?
9. What is an oxidation number?
10. What is a binary compound?
11. What is a polyatomic ion?
12. What is a balanced chemical equation?
13. What is a synthesis reaction?
14. What is a decomposition reaction?
15. What is a single displacement reaction?
16. What is a double displacement reaction?
17. How can physical and chemical changes affect matter?

Answer 1

2. Stable atoms have the appropriate neutrons and proton ratios, while radioactive substances lose their neutrons until they reach a stable isotope (ie lead).
3. Superscript either shows atomic number of an element, or the valency of an ion.
4. NaCl is neutral due to when it forms ions in water, neither element can influence the hydrogen or hydroxide concentration.
5. Atoms become ions when they lose or gain electrons.
6. Ionic compounds are formed between metals and non-metals.
7. Covalent bonds are made by non metals sharing electrons with eachother.
8. A polar molecule has positive and negative dipoles (more positive and negative areas), while a non-polar molecule has no more positive or negative region.
9. An oxidation number is given to an element based on a set rules when used to determine if an redox reaction has occured.
10. A binary compound is a compound like NaCl. Two elements only in simple configurations XY X2Y XY2
11. A polyatomic ion is a nonmetal elements forming together to form an ion - such as sulphate ion, phoshorous ion, nitrate ion.
12. A balanced chemical equation has the same number of elements on each side of the reaction (reactants and products).
13. A synthesis reaction is an organic based reaction that reacts two or more different chemical species together to produce a particular chemical.
14. A decomposition reaction is any reaction where one compound is broken down (ie heated) to form two or more different compounds.
15 A single displacement reaction is a reaction where one element appears to move out of one compound and into another. A + BX = AX + B
16. Double displacement is a reaction where two species of two componds appeat to swap. AB + CD = AC + BD
17. Physical changes only affect the state the compound is in - ie solid, liquid or gas. Chemical changes affect the number of electrons, bonding of the compound.

Answer 2

2.Every atom is most stable with a full valence shell.
3.it shows the numbers of atoms of the element in one molecular of a substance
4.Becaus NaOH and HCl are strong base and acid, NaCl is neutral
5.Atoms that have lost or gained electrons to become electrically non-neutral, are called atomic ions. Ions are divided into cations with positive (+) electric charge; or anions with negative (-) charge.
6.an ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds. The positively charged ion is usually a metal ion and the negatively charged ion is non-metallic element or molucule.
7.Covalent bonding is a description of chemical bonding that is characterized by the sharing of pairs of electrons between atoms.
8.Polar molecules

Examples of household polar molecules include ammonia and sugar (glucose). Polar molecules are generally able to dissolve in water (hydrophilic) due to the polar nature of water - like dissolves like. Polar molecules have slightly positive and slightly negatively charged ends.

[edit] Non-polar molecules

Examples of household non-polar compounds include fats, oil and petrol. Most non-polar molecules are water insoluble (hydrophobic) at room temperature. However many non-polar organic solvents, such as turpentine, are able to dissolve non-polar substances - like dissolves like.

When comparing a polar and non-polar molecule with similar molar masses, the polar molecule generally has a higher boiling point.
9.http://en.wikipedia.org/wiki/Oxidation_number
10.A binary compound is a compound that contains two elements.
11.A polyatomic ion is an ion consisting of a molecule with covalently bonded atoms or of a metal complex that can be considered as acting as a single unit in the context of acid and base chemistry or in the formation of salts.
12.http://en.wikipedia.org/wiki/Chemical_equation#Balancing_chemical_equations
13 -> 16 http://en.wikipedia.org/wiki/Chemical_reaction#Reaction_types

Answer 3

2-Giving off elelctrons makes it stable

3-How many of each element there is show superscript

4-Because Na is +1 and Cl is -1 which combines makes it 0(neutral)

5-When they gain nuetrons

6-An ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds

7-Sharing of pairs of electrons between atoms
8-polar means oppsite sides have same element noplar different

Answer 4

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