Atoms are mostly empty space.A. True13. a) what elements in the same group have in common? I dont really get this question, it seems poorly worded.......
D. element
6. A ______ is when one solution is dissolved evenly in another substance.
A. homogeneous solution
7. a) describe ionic and covalent bonding
Ionic is transfer of electrons, covalent is sharing of electrons
b) give an example of each
Ionic: table salt NaCl
Covalent: Methane CH4
8. In a chemical reaction which cannot occur?
A. new elements are formed
9.Which of the following has almost no mass?
C. electron
10. solutions are heterogeneous mixtures.
B. False
11. Increasing the pressure of a liquid lowers its boiling point.
A. True
12. Atoms are mostly empty space.
A. True
13. a) what elements in the same group have in common?
I dont really get this question, it seems poorly worded. If you mean groups (straight down a column) then the elements in every group have the same number of electrons in their outer electronic shell, and this gives them similar characteristics and properties.
b) give an example
Group 18, the furthest to the right, are the nobel gasses and have completely filled outermost electronic shells, and are relatively inert and unreactive.
1. +2 example Ca
2. D
3.C
4. D
5. D
6. A
7. NaCl is ionic when one atom gives up its outer most electron to the nonmetal Cl and both become ions.
H2O is covalent when hydrogen and oxygen share there outmost electrons so both can have a noble gas configuration
8.A
9. C
10. B
11. B
12. A
13. they have the same valance electrons. All the elements in group one have one valance electron.
I'll Help you, but please don't rely on yahoo answers to do all the work, otherwise you don't learn
1a) 2-
b) Cu --> Cu^2- + 2 e-
2) D (Positive)
3) C (Extended)
4) A (Exothermic)
5) D (Element)
6) D (Compound)
7) Covalent - The bonding between two non-metals from the periodic table.
Ionic - The bonding between a non-metal and a metal in the periodic table.
Examples :
Covalent - CO (Carbon Monoxide)
Ionic - NaCl (Sodium Chloride)
8) A (New elements are formed)
9) C (Electron)
10) B (False)
11) A (True)
12) A (True)
13) The number of electrons on the element's outer shell.
Both Ca(Calcium) and Mg (Magnesium) have 2 electrons on their outer shell.
Hope this helps
